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<journal-id journal-id-type="publisher-id">Front. Pharmacol.</journal-id>
<journal-title>Frontiers in Pharmacology</journal-title>
<abbrev-journal-title abbrev-type="pubmed">Front. Pharmacol.</abbrev-journal-title>
<issn pub-type="epub">1663-9812</issn>
<publisher>
<publisher-name>Frontiers Media S.A.</publisher-name>
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<article-meta>
<article-id pub-id-type="publisher-id">1264842</article-id>
<article-id pub-id-type="doi">10.3389/fphar.2023.1264842</article-id>
<article-categories>
<subj-group subj-group-type="heading">
<subject>Pharmacology</subject>
<subj-group>
<subject>Review</subject>
</subj-group>
</subj-group>
</article-categories>
<title-group>
<article-title>Novel potential pharmacological applications of dimethyl fumarate&#x2014;an overview and update</article-title>
<alt-title alt-title-type="left-running-head">Bresciani et al.</alt-title>
<alt-title alt-title-type="right-running-head">
<ext-link ext-link-type="uri" xlink:href="https://doi.org/10.3389/fphar.2023.1264842">10.3389/fphar.2023.1264842</ext-link>
</alt-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname>Bresciani</surname>
<given-names>Giorgia</given-names>
</name>
<xref ref-type="aff" rid="aff1">
<sup>1</sup>
</xref>
<uri xlink:href="https://loop.frontiersin.org/people/2385536/overview"/>
<role content-type="https://credit.niso.org/contributor-roles/writing-original-draft/"/>
<role content-type="https://credit.niso.org/contributor-roles/Writing - review &#x26; editing/"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname>Manai</surname>
<given-names>Federico</given-names>
</name>
<xref ref-type="aff" rid="aff2">
<sup>2</sup>
</xref>
<uri xlink:href="https://loop.frontiersin.org/people/2216566/overview"/>
<role content-type="https://credit.niso.org/contributor-roles/Writing - review &#x26; editing/"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname>Davinelli</surname>
<given-names>Sergio</given-names>
</name>
<xref ref-type="aff" rid="aff3">
<sup>3</sup>
</xref>
<uri xlink:href="https://loop.frontiersin.org/people/358505/overview"/>
<role content-type="https://credit.niso.org/contributor-roles/Writing - review &#x26; editing/"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname>Tucci</surname>
<given-names>Paolo</given-names>
</name>
<xref ref-type="aff" rid="aff4">
<sup>4</sup>
</xref>
<uri xlink:href="https://loop.frontiersin.org/people/183162/overview"/>
<role content-type="https://credit.niso.org/contributor-roles/Writing - review &#x26; editing/"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname>Saso</surname>
<given-names>Luciano</given-names>
</name>
<xref ref-type="aff" rid="aff5">
<sup>5</sup>
</xref>
<uri xlink:href="https://loop.frontiersin.org/people/613175/overview"/>
<role content-type="https://credit.niso.org/contributor-roles/Writing - review &#x26; editing/"/>
</contrib>
<contrib contrib-type="author" corresp="yes">
<name>
<surname>Amadio</surname>
<given-names>Marialaura</given-names>
</name>
<xref ref-type="aff" rid="aff1">
<sup>1</sup>
</xref>
<xref ref-type="corresp" rid="c001">&#x2a;</xref>
<uri xlink:href="https://loop.frontiersin.org/people/202688/overview"/>
<role content-type="https://credit.niso.org/contributor-roles/conceptualization/"/>
<role content-type="https://credit.niso.org/contributor-roles/writing-original-draft/"/>
<role content-type="https://credit.niso.org/contributor-roles/Writing - review &#x26; editing/"/>
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</contrib-group>
<aff id="aff1">
<sup>1</sup>
<institution>Section of Pharmacology</institution>, <institution>Department of Drug Sciences</institution>, <institution>University of Pavia</institution>, <addr-line>Pavia</addr-line>, <country>Italy</country>
</aff>
<aff id="aff2">
<sup>2</sup>
<institution>Department of Biology and Biotechnology L. Spallanzani</institution>, <institution>University of Pavia</institution>, <addr-line>Pavia</addr-line>, <country>Italy</country>
</aff>
<aff id="aff3">
<sup>3</sup>
<institution>Department of Medicine and Health Sciences &#x201c;V. Tiberio&#x201d;</institution>, <institution>University of Molise</institution>, <addr-line>Campobasso</addr-line>, <country>Italy</country>
</aff>
<aff id="aff4">
<sup>4</sup>
<institution>Department of Clinical and Experimental Medicine</institution>, <institution>University of Foggia</institution>, <addr-line>Foggia</addr-line>, <country>Italy</country>
</aff>
<aff id="aff5">
<sup>5</sup>
<institution>Department of Physiology and Pharmacology Vittorio Erspamer</institution>, <institution>Sapienza University</institution>, <addr-line>Rome</addr-line>, <country>Italy</country>
</aff>
<author-notes>
<fn fn-type="edited-by">
<p>
<bold>Edited by:</bold> <ext-link ext-link-type="uri" xlink:href="https://loop.frontiersin.org/people/77303/overview">Stefano Bruscoli</ext-link>, University of Perugia, Italy</p>
</fn>
<fn fn-type="edited-by">
<p>
<bold>Reviewed by:</bold> <ext-link ext-link-type="uri" xlink:href="https://loop.frontiersin.org/people/2323579/overview">Henrik Wilms</ext-link>, Texas Tech University Health Sciences Center, United States</p>
<p>
<ext-link ext-link-type="uri" xlink:href="https://loop.frontiersin.org/people/1282764/overview">Giovanna Casili</ext-link>, University of Messina, Italy</p>
</fn>
<corresp id="c001">&#x2a;Correspondence: Marialaura Amadio, <email>amadio@unipv.it</email>
</corresp>
</author-notes>
<pub-date pub-type="epub">
<day>07</day>
<month>09</month>
<year>2023</year>
</pub-date>
<pub-date pub-type="collection">
<year>2023</year>
</pub-date>
<volume>14</volume>
<elocation-id>1264842</elocation-id>
<history>
<date date-type="received">
<day>21</day>
<month>07</month>
<year>2023</year>
</date>
<date date-type="accepted">
<day>18</day>
<month>08</month>
<year>2023</year>
</date>
</history>
<permissions>
<copyright-statement>Copyright &#xa9; 2023 Bresciani, Manai, Davinelli, Tucci, Saso and Amadio.</copyright-statement>
<copyright-year>2023</copyright-year>
<copyright-holder>Bresciani, Manai, Davinelli, Tucci, Saso and Amadio</copyright-holder>
<license xlink:href="http://creativecommons.org/licenses/by/4.0/">
<p>This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner(s) are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.</p>
</license>
</permissions>
<abstract>
<p>Dimethyl fumarate (DMF) is an FDA-approved drug for the treatment of psoriasis and multiple sclerosis. DMF is known to stabilize the transcription factor Nrf2, which in turn induces the expression of antioxidant response element genes. It has also been shown that DMF influences autophagy and participates in the transcriptional control of inflammatory factors by inhibiting NF-&#x3ba;B and its downstream targets. DMF is receiving increasing attention for its potential to be repurposed for several diseases. This versatile molecule is indeed able to exert beneficial effects on different medical conditions through a pleiotropic mechanism, in virtue of its antioxidant, immunomodulatory, neuroprotective, anti-inflammatory, and anti-proliferative effects. A growing number of preclinical and clinical studies show that DMF may have important therapeutic implications for chronic diseases, such as cardiovascular and respiratory pathologies, cancer, eye disorders, neurodegenerative conditions, and systemic or organ specific inflammatory and immune-mediated diseases. This comprehensive review summarizes and highlights the plethora of DMF&#x2019;s beneficial effects and underlines its repurposing opportunities in a variety of clinical conditions.</p>
</abstract>
<kwd-group>
<kwd>Nrf2 pathway</kwd>
<kwd>drug repurposing</kwd>
<kwd>dimethyl fumarate</kwd>
<kwd>inflammation</kwd>
<kwd>oxidative stress</kwd>
<kwd>antioxidant</kwd>
<kwd>cardiovascular</kwd>
<kwd>neurodegenerative</kwd>
</kwd-group>
<custom-meta-wrap>
<custom-meta>
<meta-name>section-at-acceptance</meta-name>
<meta-value>Inflammation Pharmacology</meta-value>
</custom-meta>
</custom-meta-wrap>
</article-meta>
</front>
<body>
<sec id="s1">
<title>1 Introduction</title>
<p>Dimethyl fumarate (DMF) is a methyl ester of fumaric acid (FA) which has recently become the object of a renewed growing interest in pharmacological research, due to its antioxidant, anti-inflammatory, neuroprotective and anti-proliferative activities, together with its favorable safety and tolerability profiles.</p>
<p>The history of DMF&#x2019;s applications is a curious one, dating back to the beginning of the 20th century, when it was used in industrial settings as fungicide and desiccant in the shipping of sofas. The first mention of DMF in a medical context was linked to eczematous burns in subjects who had taken contact with &#x201c;poison chairs&#x201d; (Ropper, 2012). Its repurposing as a pharmakon began in the 1950s, when a German biochemist suffering from <italic>Psoriasis vulgaris</italic> administered it to himself (<xref ref-type="bibr" rid="B172">Schweckendiek, 1959</xref>), erroneously believing the disease was due to a Krebs cycle metabolic dysfunction and fumarate deficiency. This episode marked a substantial shift in both use and reputation of DMF: from skin <italic>toxic</italic> to potential skin <italic>medicine</italic>. The first DMF-containing drug was approved for the treatment of severe psoriasis in 1994, in Germany, with the trade name Fumaderm<sup>&#xae;</sup>, a combination of 60% DMF and three salts of monoethyl fumarate (MEF) for systemic use; in 2008, the clinical indication of Fumaderm<sup>&#xae;</sup> was expanded to include moderate psoriasis (<xref ref-type="bibr" rid="B135">Mrowietz et al., 2016</xref>).</p>
<p>Since then, the off-label use of DMF and other FA esters (FAEs) for psoriasis took place in several European Countries beside Germany (<xref ref-type="bibr" rid="B95">Landeck et al., 2018</xref>) and gave impulse to a better characterization of the efficacy profile of FAEs and DMF, the main active component. DMF&#x2019;s anti-inflammatory properties, along with the tolerable safety profile seen in the long-term management of psoriasis (<xref ref-type="bibr" rid="B159">Reich et al., 2009</xref>), sparked renewed interest in the drug&#x2019;s potential as a therapeutic strategy for other immune-mediated diseases, leading to the evaluation of its clinical use in multiple sclerosis (MS) (<xref ref-type="bibr" rid="B81">Kappos et al., 2008</xref>; <xref ref-type="bibr" rid="B42">Fox et al., 2012</xref>; <xref ref-type="bibr" rid="B48">Gold et al., 2012</xref>; <xref ref-type="bibr" rid="B126">Meissner et al., 2012</xref>). In 2013, DMF was marketed under the trade name Tecfidera<sup>&#xae;</sup> (BG-12) and approved as the first-line therapy for relapsing&#x2013;remitting MS (RRMS) in patients from 13&#xa0;years age in Europe and US (European Medicines Agency, 2013; Food and Drug Administration, 2013). A further advance in the use and popularity of DMF across Europe dates to 2017, when the EMA approved Skilarence<sup>&#xae;</sup> (European Medicines Agency, 2017), a new oral formulation of the sole DMF for the treatment of moderate-to-severe chronic plaque psoriasis in adult patients.</p>
<p>DMF is still the gold standard in the treatment of plaque psoriasis and a good therapeutic option for RRMS; as understanding of the pathogenesis of these diseases improved, DMF beneficial effects have been more correctly attributed to its modulation of the immune and inflammatory responses (<xref ref-type="bibr" rid="B129">Miljkovi&#x107; et al., 2015</xref>; <xref ref-type="bibr" rid="B95">Landeck et al., 2018</xref>). However, increasing evidence indicates that DMF effects are pleiotropic, and its clinical use may be broader than was conceived for decades. Accordingly, in recent years, several studies have underlined numerous promising alternatives for the repurposing of DMF, as its antioxidant, anti-inflammatory, neuroprotective properties constitute a convincing rationale for DMF use in different diseases (for comprehensive reviews on the specific topics, see, for example, <xref ref-type="bibr" rid="B189">Tastan et al., 2022</xref>; <xref ref-type="bibr" rid="B122">Manai et al., 2022</xref>; <xref ref-type="bibr" rid="B133">Morris et al., 2022</xref>; <xref ref-type="bibr" rid="B168">S&#xe1;nchez-Garc&#xed;a et al., 2021</xref>; <xref ref-type="bibr" rid="B89">Kourakis et al., 2020</xref>; <xref ref-type="bibr" rid="B5">Al-Ani et al., 2020</xref>; <xref ref-type="bibr" rid="B164">Sachinvala et al., 2020</xref>; <xref ref-type="bibr" rid="B173">Scuderi et al., 2020</xref>; <xref ref-type="bibr" rid="B166">Saidu et al., 2019</xref>).</p>
<p>After a brief description of DMF&#x2019;s mechanisms of actions and cellular/molecular pathways underlying its biological effects, the present review provides an exhaustive analysis of the most recent literature evidence for DMF novel pharmacological applications by considering both preclinical and clinical data.</p>
</sec>
<sec id="s2">
<title>2 Mechanisms of action: molecular targets and pathways</title>
<p>As an &#x3b1;,&#x3b2;-unsaturated carboxylic ester, DMF (C<sub>6</sub>H<sub>8</sub>O<sub>4</sub>; MW: 144.13&#xa0;g/mol), exhibits a high degree of electrophilicity. Upon oral administration, the compound undergoes initial metabolism via esterase, thereby yielding its primary active metabolite, monomethyl fumarate (MMF) (<xref ref-type="bibr" rid="B200">Werdenberg et al., 2003</xref>). DMF, MMF and other fumarates interact with the antioxidant glutathione (GSH), through a Michael addition reaction with cysteine residues; on the other hand, enzymes in the cytochrome P450 complex are not involved in DMF metabolism (<xref ref-type="bibr" rid="B9">Aubets et al., 2019</xref>).</p>
<p>To maximize DMF absorption in the small intestine, in clinical practice orally administered formulations are characterized by a delayed release (<xref ref-type="bibr" rid="B81">Kappos et al., 2008</xref>). DMF detection in systemic circulation is not significant, and less than 0.1% of the applied DMF dosage is detected in urine (<xref ref-type="bibr" rid="B109">Litjens et al., 2004</xref>). There is a lack of evidence pertaining to the accumulation of DMF subsequent to the administration of multiple doses (<xref ref-type="bibr" rid="B177">Sheikh et al., 2013</xref>). Excretion of DMF through urine and faeces is also negligible since it is mostly eliminated through CO<sub>2</sub> exhalation.</p>
<p>MMF systemic peak concentration, which is usually reached 2&#x2013;2.5&#xa0;h after oral administration, is delayed by concomitant administration of fatty foods; however, this does not influence the area under the curve, which is proportional to the administered dose (<xref ref-type="bibr" rid="B106">Linker and Haghikia, 2016</xref>), instead helping to manage the intensity of the adverse effects affecting the gastrointestinal (GI) tract (<xref ref-type="bibr" rid="B148">Paolinelli et al., 2022</xref>).</p>
<p>The number of pathways involved in the biological activities of DMF, and their relative contribution to its clinical effects, are not entirely understood, as the pharmacodynamics of FAEs are still to be completely elucidated. Moreover, the exact impact of DMF on each pathway is hard to determine due to several variables (e.g., the level of tissue exposure, the rate of absorption and metabolism); however, some main cellular targets/pathways relevant to its therapeutic effects have been established, and include the nuclear factor erythroid 2-related factor 2 (Nrf2) transcription pathway, the nuclear factor kappa-light-chain-enhancer of activated B cells (NF-&#x3ba;B) pathway, glutathione and its biosynthesis pathway, the autophagy system, and the hydroxycarboxylic acid receptor 2 (HCAR2) (<xref ref-type="fig" rid="F1">Figure 1</xref>).</p>
<fig id="F1" position="float">
<label>FIGURE 1</label>
<caption>
<p>DMF&#x2019;s immunomodulatory and antioxidative effects rely on its regulation of several pathways, among which the Keap1/Nrf2/ARE and NF-&#x3ba;B pathways, the modulation of GSH levels, its agonism of HCAR2 and its effects on the autophagic system. Based on these properties, DMF has sparked interest due to its potential repurposing for a variety of pathologies characterized or aggravated by inflammatory processes and oxidative stress. Abbreviations: dimethyl fumarate (DMF), glutathione (GSH), Hydroxycarboxylic Acid Receptor 2 (HCAR2), sequestrome 1 (p62/SQSTM1), Kelch-like ECH-associated protein (Keap1), nuclear factor erythroid 2-related factor 2 (Nrf2), nuclear factor kappa-light-chain-enhancer of activated B cells (NF-&#x3ba;B), <italic>hemoxygenase-1</italic> (<italic>HO1</italic>), <italic>quinoline oxidoreductase-1</italic> (<italic>NQO1</italic>), <italic>superoxide dismutase</italic> (<italic>SOD</italic>).</p>
</caption>
<graphic xlink:href="fphar-14-1264842-g001.tif"/>
</fig>
<sec id="s2-1">
<title>2.1 Nrf2/ARE pathway</title>
<p>Oxidative stress is a state of imbalance between cellular oxidants and antioxidants, in which the oxidant agents induce a disruption in redox signaling and trigger a cascade leading to several forms of cellular damage. Oxidants and reactive oxygen species can generate and accumulate in all types of organelles, and this process plays a key role in the pathogenesis of a variety of diseases (<xref ref-type="bibr" rid="B10">Azzi, 2022</xref>). The Nrf2 pathway is an essential protective mechanism against oxidative damage, exerting its cytoprotective action through the regulation of a wide array of antioxidant response elements (AREs)-bearing genes (<xref ref-type="bibr" rid="B208">Zhao et al., 2017</xref>), and of genes controlling fundamental cellular functions and processes (e.g., cell survival and proliferation, autophagy, regulation of drug elimination, DNA repair and mitochondrial function) (<xref ref-type="bibr" rid="B59">Hayes and Dinkova, 2014</xref>; <xref ref-type="bibr" rid="B161">Rojo de la Vega et al., 2018</xref>).</p>
<p>Under physiological conditions, the Kelch-like ECH-associated protein (Keap1) maintains Nrf2 sequestered and inactive in the cytoplasm and induces its degradation via proteasome. The cysteine residues-containing domains within the Keap1 structure work as a redox sensor, allowing it to register changes in the levels of oxidant or electrophilic agents and to respond accordingly, destabilizing the Nrf2/Keap1 complex, leading to translocation of Nrf2 to the nucleus and preventing its proteolysis (<xref ref-type="bibr" rid="B87">Kobayashi et al., 2004</xref>). DMF, an electrophilic agent, causes the oxidation of the reactive thiols in the Keap1 protein, and thus induces Nfr2 nuclear translocation and activation (<xref ref-type="bibr" rid="B107">Linker et al., 2011</xref>). Among Nrf2-regulated genes are <italic>hemoxygenase-1</italic> (<italic>HO1</italic>) and <italic>quinoline oxidoreductase-1</italic> (<italic>NQO1</italic>), particularly relevant for their antioxidant effects, and genes involved in the expression of xenobiotic metabolism enzymes and drug efflux pumps (<xref ref-type="bibr" rid="B163">Scannevin et al., 2012</xref>; <xref ref-type="bibr" rid="B212">Zhou et al., 2013</xref>). Moreover, Nrf2 promotes the activation of GSH biosynthesis pathway, directing intracellular cysteine toward GSH synthesis by modulating glutamate-cysteine ligase (GCL) and glutathione synthase (GSS) A complex crosstalk between Nrf2 and different components of the autophagic system has also been observed; deficiencies in autophagy-related proteins may lead to the persistent activation of Nrf2 through the binding of p62 to Keap1, which isolates Keap1 and leads to Nrf2 activation (<xref ref-type="bibr" rid="B72">Inami et al., 2011</xref>; <xref ref-type="bibr" rid="B138">Ni et al., 2012</xref>; <xref ref-type="bibr" rid="B139">Ni et al., 2014</xref>). The interaction between the two factors works both ways, as p62 is also a target gene positively regulated by Nrf2 (<xref ref-type="bibr" rid="B75">Jain et al., 2010</xref>). A fundamental role in the p62-dependent sequestration of Keap1, and the resulting activation of the Nrf2 pathway, is played by the mammalian target of rapamycin complex 1 (mTORC1). It is the phosphorylation of p62 at Ser349, which can be carried out by mTORC1in response to conditions of oxidative stress, nutrient stress, damaged mitochondria or invading pathogens, that induces Keap1 sequestration (<xref ref-type="bibr" rid="B33">Duran et al., 2011</xref>; <xref ref-type="bibr" rid="B71">Ichimura et al., 2013</xref>).</p>
<p>In conclusion, Nrf2 represents a pharmacological target fully embraced by both classic and systems medicine approaches for drug development and drug repurposing, since alterations of Nrf2 signaling are identified as a common molecular mechanism in a network of different pathophenotypes comprised in the so-called &#x201c;Nrf2 diseasome&#x201d; (<xref ref-type="bibr" rid="B26">Cuadrado et al., 2018</xref>).</p>
</sec>
<sec id="s2-2">
<title>2.2 NF-&#x3ba;B</title>
<p>The NF-&#x3ba;B protein complex includes five different subunits (i.e., RelA/p65, RelB, c-Rel, NF-&#x3ba;B1 p50, NF-&#x3ba;B2 p52) and functions as a transcription factor, controlling the expression of genes involved in immunity and inflammation, the development of lymphoid organs and the maturation of B-cells (<xref ref-type="bibr" rid="B58">Hayden and Ghosh, 2008</xref>). The phosphorylation and acetylation of the RelA/p65 subunit is essential for the activation of the whole complex; again, as an electrophilic compound, DMF reacts with the cysteine residues on RelA/p65 and triggers a covalent modification, preventing the phosphorylation of NF-&#x3ba;B and its translocation to the nucleus (<xref ref-type="bibr" rid="B82">Kastrati et al., 2016</xref>). This inhibitory effect on NF-&#x3ba;B results in a rebalancing between pro- and anti-inflammatory factors and triggers both alterations in the maturation of antigen-presenting cells and a switch in T helper cells subtype - from type 1 and 17 to type 2 - which in turn leads to a shift in cytokines production in favor of interleukin 4 and 5 (<xref ref-type="bibr" rid="B151">Peng et al., 2012</xref>; <xref ref-type="bibr" rid="B124">McGuire et al., 2016</xref>).</p>
</sec>
<sec id="s2-3">
<title>2.3 Glutathione</title>
<p>Glutathione (GSH) functions as the main antioxidant and detoxifying system in cells, granting a protective mechanism against any damage connected to increase in oxidant agents, which represent a key factor in the pathogenesis of several diseases. As previously mentioned, by Nrf2 activation, DMF regulates the gene expression of enzymes belonging to the GSH biosynthetic pathway. In addition, a physical interaction between DMF and GSH may occur and affect GSH availability and function. More specifically, DMF interacts with the thiol groups on the GSH molecule, which leads to a Michael addition reaction and consequent modifications in GSH levels and function. This initial sequestration of GSH by DMF may trigger an adaptive response, inducing a subsequent increase in both GSH production and recycling (<xref ref-type="bibr" rid="B62">Hoffmann et al., 2017</xref>). This latter DMF-induced upregulation of GSH levels contributes in turn to the inhibition of NF-&#x3ba;B and, subsequently, of inflammatory cytokines expression, independently from the Nrf2 pathway activation (<xref ref-type="bibr" rid="B45">Gillard et al., 2015</xref>). However, these effects are dose-dependent and also vary based on the cell type; low concentrations of DMF in nontumorigenic cells upregulate GSH levels as mentioned, while DMF administered to tumorigenic cells triggers GSH depletion through the inhibition of the first enzyme in its biosynthetic pathway, &#x3b3;-GCS (<xref ref-type="bibr" rid="B167">Saidu et al., 2017</xref>). This latter dose-dependent effect may represent a useful strategy in cancerous cells, where treatment with high dosage of DMF results in depletion of intracellular GSH and increased ROS levels and, ultimately, cell death. On the other hand, the DMF-induced GSH decrease can also lead to undesired apoptotic death in some noncancerous cell types, such as T-cell lymphocytes (<xref ref-type="bibr" rid="B194">Treumer et al., 2003</xref>). Lymphopenia is in fact one of the most troubling adverse effects of DMF, although it occurs in a minority of patients and is likely due, at least in part, to genetic predisposition (<xref ref-type="bibr" rid="B194">Treumer et al., 2003</xref>; <xref ref-type="bibr" rid="B148">Paolinelli et al., 2022</xref>).</p>
</sec>
<sec id="s2-4">
<title>2.4 Autophagy</title>
<p>Autophagy plays a critical role in the homeostasis of the cell and its functions, eliminating damaged organelles and other superfluous or dysfunctional intracellular components, and contributing to cell survival against stress conditions or specific treatment. This makes the autophagic pathway a promising target in a variety of conditions, with pharmacological modulation aiming either to stimulate autophagy and to exploit its protective role, or to inhibit it from constituting an escape mechanism, like in cancer cells. DMF&#x2019;s interaction with the autophagic pathway is mainly dependent on DMF-mediated activation of Nrf2, as the two pathways are correlated by a positive feedback loop: Nrf2 activation can result in the transcription of <italic>TP53</italic>, an autophagy inducer, whereas the autophagy adaptor protein SQSTM1/p62 may induce the nuclear translocation of Nrf2 through the autophagy-dependent degradation of Keap1 (<xref ref-type="bibr" rid="B68">Hu et al., 2022</xref>).</p>
</sec>
<sec id="s2-5">
<title>2.5 Additional pathways</title>
<p>Beside the upper mentioned pathways, the anti-inflammatory activity exerted by DMF is also reliant on its agonism of the hydroxycarboxylic acid receptor 2 (HCAR2), as demonstrated <italic>in vivo</italic> in a mouse model of experimental autoimmune encephalomyelitis (EAE) (<xref ref-type="bibr" rid="B23">Chen et al., 2014</xref>). HCAR2, expressed in several cell types ranging from macrophages and neutrophils to intestinal or retinal epithelial cells, is implicated in anti-inflammatory responses (<xref ref-type="bibr" rid="B144">Offermanns, 2017</xref>). This HCAR2-related anti-inflammatory activity is dependent on a decrease in immune cells infiltration, likely resulting from HCAR2 interference with neutrophil adhesion to endothelial cells and chemotaxis. Blockade of HCAR2 completely reverses the effect of DMF on the expression of inflammatory and oxidative stress-related molecules (<xref ref-type="bibr" rid="B149">Parodi et al., 2015</xref>), demonstrating the involvement of HCAR2 in its clinical activity. The HCAR2-dependent regulation of the inflammatory response is likely due to activation of the G protein signalling cascade, which results in AMPK activation and increased NAD<sup>&#x2b;</sup>-dependent protein deacetylase sirtuin-1 (SIRT-1) levels; SIRT-1 directly inhibits NF-&#x3ba;B through the deacetylation of the RelA/p65 subunit (<xref ref-type="bibr" rid="B205">Yeung et al., 2004</xref>), leading to previously discussed anti-inflammatory downstream effects. On the other hand, the pleiotropic nature of HCAR2 leads to different downstream outcomes, depending on cell type and experimental conditions; this pleiotropic effect of HCAR2 activation is behind some of the side effects of DMF treatment (e.g., flushing and gastrointestinal symptoms). Activation of HCAR2 by MMF has been demonstrated to induce cyclooxygenase-2 (COX-2)-mediated synthesis of prostaglandins in keratinocytes and Langerhans cells, leading to flushing, which occurs in up to 40% of patients and is due to the resulting prostaglandin-dependent vasodilatation (<xref ref-type="bibr" rid="B55">Hanson et al., 2012</xref>). Moreover, a recent study demonstrated that the pro-inflammatory effect of DMF administration on intestinal epithelial cells (IEC), which contributes to the gastrointestinal side effects possibly occurring in the earliest months of treatment, is also dependent on the experimental context (<xref ref-type="bibr" rid="B150">Parodi et al., 2021</xref>). In fact, the pathways activated through the binding of MMF to HCAR2 differed in <italic>in vitro</italic> and <italic>in vivo</italic> models, with the HCAR2/COX-2 pathway being responsible for the inflammation in IEC grown <italic>in vitro</italic>, and the HCAR2/extracellular signal-regulated kinases (ERK) 1/2 pathway being involved in the inflammatory response in IEC <italic>in vivo</italic>. Furthermore, the pro-inflammatory effects were only observed in resting, but not IFN-&#x3b3;-stimulated IEC in the <italic>in vitro</italic> model, while the opposite was observed <italic>in vivo</italic>, where DMF activated the HCAR2/ERK1/2 pathway only in pro-inflammatory conditions (i.e., in EAE-affected, but not na&#xef;ve, mice).</p>
<p>DMF also exhibits a regulatory effect on iron availability in specific cell types. Iron accumulation is another process that has been linked to the pathogenesis of neurodegenerative diseases. Physiologically, iron plays a key role in myelination, and is released by microglia in order to support the myelination process carried out by oligodendrocytes (<xref ref-type="bibr" rid="B193">Todorich et al., 2011</xref>). Damage to oligodendrocytes can cause uncontrolled iron release and extracellular accumulation, leading to an increase in free radicals and induction of the inflammatory response (<xref ref-type="bibr" rid="B52">Haider et al., 2014</xref>). DMF exhibits a neuroprotective effect against the iron-induced toxicity, modulating the microglial and oligodendrocytic levels of T-cell immunoglobulin mucin domain 2 protein (TIM-2) and transferrin receptor 1, which increase the uptake of iron and ferritin by these cells, shifting microglia back to an anti-inflammatory phenotype (<xref ref-type="bibr" rid="B90">Kronenberg et al., 2019</xref>).</p>
</sec>
</sec>
<sec id="s3">
<title>3 Current approved clinical indications of DMF</title>
<sec id="s3-1">
<title>3.1 Psoriasis</title>
<p>Psoriasis is a non-contagious dermatosis arising from a chronic inflammatory response, in which scaly skin plaques, easily distinguished from the surrounding normal epithelium, form as a result of the abnormal activity of different cell types, including macrophages, T lymphocytes, dendritic cells, neutrophils, and keratinocytes (<xref ref-type="bibr" rid="B142">Nograles and Krueger, 2011</xref>). The extension of the skin lesions, according to which the degree of severity is established, can vastly differ, from covering less than 2% of the skin surface (mild psoriasis), to affecting up to 10% (moderate psoriasis) or more (severe psoriasis) of the body (<xref ref-type="bibr" rid="B97">Lebwohl et al., 2004</xref>). As previously mentioned, in the late 1950s, when DMF was first examined as a therapeutic option for the treatment of psoriasis, the disease was thought to be the result of a metabolic dysfunction in the TCA cycle (<xref ref-type="bibr" rid="B172">Schweckendiek, 1959</xref>). It was hypothesized that FA, as an intermediate Krebs cycle product, could balance the enzymatic deficit, but esters of FA were administered instead, because of their favorable absorption profile (<xref ref-type="bibr" rid="B7">Altmeyer et al., 1994</xref>). Encouraged by the promising positive results obtained in clinical trials, a formulation containing DMF and salts of MEF, Fumaderm<sup>&#xae;</sup>, was approved for the treatment of moderate-to-severe plaque psoriasis (<xref ref-type="bibr" rid="B7">Altmeyer et al., 1994</xref>; <xref ref-type="bibr" rid="B202">Wollina, 2011</xref>). The sole administration of MEF did not exhibit any discernible clinical impact on the ailment, however, thus DMF was ascertained as the bioactive constituent of the medication. Another formulation containing exclusively DMF, Skilarence<sup>&#xae;</sup>, was approved shortly thereafter (<xref ref-type="bibr" rid="B135">Mrowietz et al., 2016</xref>). DMF is currently the first-line systemic therapy for chronic plaque psoriasis (<xref ref-type="bibr" rid="B148">Paolinelli et al., 2022</xref>), with the therapeutic dose of the drug ranging from 30 to 720&#xa0;mg. A recent multicentric retrospective study on 103 patients affected by psoriasis and treated with DMF (<xref ref-type="bibr" rid="B25">Corazza et al., 2021</xref>) underlined an onset of efficacy consistent with previously available data, which indicated fumarates as comparatively slower than other therapies (<xref ref-type="bibr" rid="B28">de Jong et al., 1996</xref>). In fact, the Psoriasis Area and Severity Index (PASI) reached a 75% reduction (i.e., PASI75) after 12 weeks in 23% of patients (35% of those still undergoing DMF treatment), and after 26 weeks of continued treatment in 40% of patients (80% of patients who had not interrupted treatment), respectively (<xref ref-type="bibr" rid="B25">Corazza et al., 2021</xref>). The pathogenesis of psoriasis is still to be fully elucidated, but immunological factors play quite a significant role in its etiology (<xref ref-type="bibr" rid="B145">Ogawa et al., 2017</xref>), and thus DMF&#x2019;s main mechanism of action in this pathological context was identified in its immunomodulatory properties (<xref ref-type="bibr" rid="B131">Montes Diaz et al., 2018</xref>). More specifically, the DMF-induced shift toward the Th2 phenotype in CD4<sup>&#x2b;</sup> cells contrasts the Th1 and Th17 lymphocytes infiltration of the skin, which triggers the dysfunction of keratinocytes and the skin lesions peculiar to psoriasis (<xref ref-type="bibr" rid="B194">Treumer et al., 2003</xref>). In addition, it is now clear that both the activation of the Nrf2 pathway and the inhibition of NF-kB activity regulate the pattern of cytokine release, promoting anti-inflammatory responses (<xref ref-type="bibr" rid="B201">Wilms et al., 2010</xref>; <xref ref-type="bibr" rid="B44">Ghoreschi et al., 2011</xref>).</p>
</sec>
<sec id="s3-2">
<title>3.2 Multiple sclerosis</title>
<p>DMF&#x2019;s effectiveness in modulating the inflammatory processes responsible for plaque psoriasis promoted the exploration of FAEs therapeutic potential in mice with experimental autoimmune encephalomyelitis (EAE), a well-known <italic>in vivo</italic> model of MS (<xref ref-type="bibr" rid="B169">Schilling et al., 2006</xref>). Dysfunctions in the immune response, both innate and adaptive, are at the core of MS etiology, and lead to demyelinating lesions (<xref ref-type="bibr" rid="B63">H&#xf8;glund, 2014</xref>). After a promising outcome in the EAE animal model, Fumaderm<sup>&#xae;</sup> was administered for the first time to MS patients in 2006 (<xref ref-type="bibr" rid="B170">Schimrigk et al., 2006</xref>); the encouraging improvements observed in clinical and radiological parameters led to further clinical trials and eventually to the formulation of BG-12, a slow-release orally administered preparation of DMF. BG-12/DMF was confirmed to decrease both the ratio of relapsing patients, and the annual relapse rate and number of lesions per patient (<xref ref-type="bibr" rid="B42">Fox et al., 2012</xref>; <xref ref-type="bibr" rid="B48">Gold et al., 2012</xref>; <xref ref-type="bibr" rid="B41">Fox and Phillips, 2013</xref>). These effects are linked to the immunomodulatory activity of DMF, as suggested by the lower counts of both CD4<sup>&#x2b;</sup> and CD8<sup>&#x2b;</sup> T cells, dendritic cells (DCs) and B cells in treated patients (<xref ref-type="bibr" rid="B116">Longbrake et al., 2016</xref>). Moreover, DMF therapeutic effect also correlates with Nrf2 pathway activation (<xref ref-type="bibr" rid="B53">Hammer et al., 2018</xref>) and the modulation of the maturation process of DCs, and more specifically with their DMF-induced activation towards an anti-inflammatory phenotype (<xref ref-type="bibr" rid="B44">Ghoreschi et al., 2011</xref>; <xref ref-type="bibr" rid="B151">Peng et al., 2012</xref>). Despite the enteric coating of DMF pills, purposely formulated to reduce its GI tract-related side effects, GI symptoms are still very common in the first month of BG-12/DMF therapy and still constitute the main reason for the treatment discontinuation (<xref ref-type="bibr" rid="B40">Fox et al., 2016</xref>; <xref ref-type="bibr" rid="B147">Palte et al., 2019</xref>). This limitation motivated further efforts towards the improvement of DMF&#x2019;s gut tolerability, resulting in the formulation of a novel FAE, diroximel fumarate (DRF). DRF has been marketed under the name Vumerity<sup>&#xae;</sup> and has been approved for the treatment of RRMS after recent Phase III studies (NCT02634307, NCT03093324) that proved the safety and efficacy profiles of DRF (<xref ref-type="bibr" rid="B147">Palte et al., 2019</xref>; <xref ref-type="bibr" rid="B137">Naismith et al., 2020</xref>). Compared to DMF, DRF presents fewer GI-related adverse effects, and an equivalent production of MMF. The improvement in gut tolerability is likely linked to the different metabolites released following the esterase-dependent cleavage of DMF and DRF; in fact, DMF&#x2019;s metabolism results in the release of MMF and methanol, the latter of which causes GI tract symptoms upon interaction with the small intestine mucosa. DRF&#x2019;s main metabolites, on the other hand, are MMF and inert 2-hydroxyethyl succinimide, as well as lesser amounts of RDC-8439 and methanol (<xref ref-type="bibr" rid="B147">Palte et al., 2019</xref>).</p>
</sec>
</sec>
<sec id="s4">
<title>4 Novel potential pharmacological applications</title>
<p>The immunomodulatory effects of DMF that have been discussed so far have contributed to entice interest in the potential repurposing of the compound in several new pathological contexts. Because of the molecular pathways involved in DMF&#x2019;s therapeutic effects, its future applications will most likely focus on diseases in which inflammatory responses or oxidative stress are main factors in tiology (<xref ref-type="fig" rid="F2">Figure 2</xref>). In the next sections, we discuss the latest findings on the effects of DMF and its potential for novel clinical applications (<xref ref-type="table" rid="T1">Table 1</xref>).</p>
<fig id="F2" position="float">
<label>FIGURE 2</label>
<caption>
<p>Main pathological contexts reporting protective or beneficial effects of DMF treatment. Recent studies demonstrate DMF&#x2019;s efficacy in several <italic>in vivo</italic> models of different pathologies; in particular, preclinical data is available on different cardiovascular, neurodegenerative, ocular and gastrointestinal diseases, as well as tumors, as shown in the picture. DMF&#x2019;s effect is also being investigated in other pathologies outside of these main contexts (see text for additional information). Abbreviations: GBM: glioblastoma multiforme; CTCL: cutaneous T-cell lymphoma; NSCLC: non-small cells lung cancer; OSCC: oral squamous cell carcinoma; AML: acute myeloid leukemia.</p>
</caption>
<graphic xlink:href="fphar-14-1264842-g002.tif"/>
</fig>
<table-wrap id="T1" position="float">
<label>TABLE 1</label>
<caption>
<p>Summary of human studies testing the effect of dimethyl fumarate for novel clinical applications.</p>
</caption>
<table>
<thead valign="top">
<tr>
<th align="center">Study (Author and year)</th>
<th align="center">Study design</th>
<th align="center">Study population</th>
<th align="center">Treatment details (duration and dose)</th>
<th align="center">Findings</th>
</tr>
</thead>
<tbody valign="top">
<tr>
<td rowspan="2" align="center">
<xref ref-type="bibr" rid="B171">Schmieder et al. (2015)</xref>
</td>
<td rowspan="2" align="center">Prospective pilot study</td>
<td rowspan="2" align="center">Patients with psoriasis (n &#x3d; 27)</td>
<td align="center">16 weeks</td>
<td align="center">&#x2022; Increase in adiponectin</td>
</tr>
<tr>
<td align="center">600&#xa0;mg/die</td>
<td align="center">&#x2022; Reduction of depressive symptoms</td>
</tr>
<tr>
<td rowspan="2" align="center">
<xref ref-type="bibr" rid="B16">Blumenfeld Kan et al. (2019)</xref>
</td>
<td rowspan="2" align="center">Retrospective study</td>
<td rowspan="2" align="center">Patients with multiple sclerosis (n &#x3d; 41)</td>
<td rowspan="2" align="center">12&#xa0;months dose N/A &#x22EE;</td>
<td align="center">&#x2022; Increase in HDL, HDL/LDL ratio and HDL/total cholesterol</td>
</tr>
<tr>
<td align="center">&#x2022; No change in LDL or triglycerides</td>
</tr>
<tr>
<td rowspan="2" align="center">
<xref ref-type="bibr" rid="B64">Holzer et al. (2020)</xref>
</td>
<td rowspan="2" align="center">Prospective, randomized controlled head-to-head trial</td>
<td rowspan="2" align="center">Patients with psoriasis (n &#x3d; 65)</td>
<td align="center">6&#xa0;months</td>
<td rowspan="2" align="center">&#x2022; Decrease in total cholesterol and apolipoprotein B</td>
</tr>
<tr>
<td align="center">120&#xa0;mg/die</td>
</tr>
<tr>
<td rowspan="2" align="center">
<xref ref-type="bibr" rid="B39">Filippi et al. (2022)</xref>
</td>
<td rowspan="2" align="center">Case report</td>
<td rowspan="2" align="center">Patient with psoriasis (n &#x3d; 1)</td>
<td align="center">9 weeks</td>
<td align="center">&#x2022; Improvements of working memory, writing, speech, and motor coordination</td>
</tr>
<tr>
<td align="center">30&#x2013;720&#xa0;mg/die</td>
<td align="center">&#x2022; Reduction in tremor and facial hypomimia</td>
</tr>
<tr>
<td rowspan="3" align="center">
<xref ref-type="bibr" rid="B198">Vucic et al. (2021)</xref>
</td>
<td align="center">Phase-2, double-blind, placebo-controlled</td>
<td rowspan="3" align="center">Patients with amyotrophic lateral sclerosis (n &#x3d; 107)</td>
<td align="center">36 weeks</td>
<td align="center">&#x2022; Reduction in neurophysiological index</td>
</tr>
<tr>
<td align="center">randomized trial</td>
<td align="center">480&#xa0;mg/die</td>
<td align="center">&#x2022; No effect on respiratory function, urinary neurotrophin, and quality of life</td>
</tr>
<tr>
<td align="left"/>
<td align="left"/>
<td align="center">&#x2022; Safe and well-tolerated</td>
</tr>
<tr>
<td rowspan="2" align="center">
<xref ref-type="bibr" rid="B80">Kabanovski et al. (2023)</xref>
</td>
<td rowspan="2" align="center">Prospective study</td>
<td align="center">Patients with relapsing-remitting multiple</td>
<td rowspan="2" align="center">1&#x2013;4&#xa0;years dose N/A &#x22EE;</td>
<td rowspan="2" align="center">&#x2022; No effect on retinal nerve fiber layers</td>
</tr>
<tr>
<td align="center">sclerosis (n &#x3d; 18)</td>
</tr>
<tr>
<td rowspan="2" align="center">
<xref ref-type="bibr" rid="B61">Heinz and Heiligenhaus (2007)</xref>
</td>
<td rowspan="2" align="center">Pilot study</td>
<td rowspan="2" align="center">Patients with bilateral uveitis (n &#x3d; 4)</td>
<td align="center">12&#x2013;15&#xa0;months</td>
<td rowspan="2" align="center">&#x2022; Improvement of cystoid macular edema and uveitis</td>
</tr>
<tr>
<td align="center">600&#x2013;1,200&#xa0;mg/die</td>
</tr>
<tr>
<td rowspan="2" align="center">Kofler et al. (2018)</td>
<td rowspan="2" align="center">Case report</td>
<td rowspan="2" align="center">Patient with age-related macular degeneration (n &#x3d; 1)</td>
<td align="center">60&#xa0;months</td>
<td align="center">&#x2022; Reduction in the retinal thickness</td>
</tr>
<tr>
<td align="center">240&#xa0;mg/die</td>
<td align="center">&#x2022; Improvement of macular edema</td>
</tr>
<tr>
<td rowspan="2" align="center">Diebold et al. (2022)</td>
<td rowspan="2" align="center">Prospective study</td>
<td align="center">Patients with relapsing-remitting multiple</td>
<td align="center">12&#xa0;months</td>
<td align="center">&#x2022; Alterations in the gut microbiota metabolome</td>
</tr>
<tr>
<td align="center">sclerosis (n &#x3d; 20)</td>
<td align="center">240&#xa0;mg/twice die<xref ref-type="table-fn" rid="Tfn1">
<sup>a</sup>
</xref>
</td>
<td align="center">&#x2022; Induction of lymphopenia</td>
</tr>
<tr>
<td align="center">
<xref ref-type="bibr" rid="B37">Eppinga et al. (2017)</xref>
</td>
<td align="center">Retrospective study</td>
<td align="center">Patients with psoriasis (n &#x3d; 90)</td>
<td align="center">6&#x2013;9&#xa0;weeks dose N/A&#x2058; &#x22EE;</td>
<td align="center">&#x2022; Induction of <italic>Saccharomyces cerevisiae</italic> growth</td>
</tr>
<tr>
<td rowspan="2" align="center">
<xref ref-type="bibr" rid="B84">Katz Sand et al. (2019)</xref>
</td>
<td rowspan="2" align="center">Cross-sectional study</td>
<td rowspan="2" align="center">Patients multiple sclerosis (n &#x3d; 186)</td>
<td rowspan="2" align="center">At least 3&#xa0;months dose N/A &#x22EE;</td>
<td align="center">&#x2022; Decrease in the phyla <italic>Firmicutes</italic> and <italic>Fusobacteria</italic>
</td>
</tr>
<tr>
<td align="center">&#x2022; Increase in the phylum <italic>Bacteroidetes</italic>
</td>
</tr>
<tr>
<td rowspan="2" align="center">
<xref ref-type="bibr" rid="B184">Storm-Larsen et al. (2019)</xref>
</td>
<td rowspan="2" align="center">Pilot trial</td>
<td align="center">Patients with relapsing-remitting multiple</td>
<td rowspan="2" align="center">12 weeks dose N/A &#x22EE;</td>
<td rowspan="2" align="center">&#x2022; Normalization of the low abundance of butyrate-producing <italic>Faecalibacterium</italic>
</td>
</tr>
<tr>
<td align="center">sclerosis (n &#x3d; 36)</td>
</tr>
<tr>
<td rowspan="2" align="center">
<xref ref-type="bibr" rid="B18">Buscarinu et al. (2021)</xref>
</td>
<td rowspan="2" align="center">Intervention trial</td>
<td align="center">Patients with relapsing-remitting multiple</td>
<td rowspan="2" align="center">9 months dose N/A &#x22EE;</td>
<td align="center">&#x2022; No clear effect on intestinal permeability</td>
</tr>
<tr>
<td align="center">sclerosis (n &#x3d; 25)</td>
<td align="center">&#x2022; Reduction in the circulating levels of CD161&#x2b;CCR6&#x2b;CD8<sup>&#x2b;</sup> T cells</td>
</tr>
<tr>
<td rowspan="2" align="center">
<xref ref-type="bibr" rid="B128">Milad et al. (2022)</xref>
</td>
<td rowspan="2" align="center">Randomized, phase II, placebo, triple-blinded, controlled trial</td>
<td rowspan="2" align="center">Patients with glioblastoma (n &#x3d; 36)</td>
<td align="center">One week before surgery</td>
<td align="center">&#x2022; Higher Kanofsky&#x2019;s performance status</td>
</tr>
<tr>
<td align="center">240&#xa0;mg, three-times per day</td>
<td align="center">&#x2022; No change in the serum S100&#x3b2; level</td>
</tr>
<tr>
<td rowspan="3" align="center">
<xref ref-type="bibr" rid="B176">Shafer et al. (2017)</xref>
</td>
<td align="center">Phase I single-arm</td>
<td rowspan="3" align="center">Patients with glioblastoma (n &#x3d; 12)</td>
<td align="center">DMF combined with radio- and chemotherapy</td>
<td align="center">&#x2022; Increase in progression-free survival</td>
</tr>
<tr>
<td align="center">single-institution</td>
<td align="center">120&#xa0;mg twice daily</td>
<td rowspan="2" align="center">&#x2022; Safe and well tolerated</td>
</tr>
<tr>
<td align="center">dose-escalation study</td>
<td align="center">240&#xa0;mg twice and three times daily</td>
</tr>
</tbody>
</table>
<table-wrap-foot>
<fn id="Tfn1">
<label>
<sup>a</sup>
</label>
<p>: Authors declare the study to be a continuation of a previous work (Diebold et al., 2018), where the specified treatment was 240&#xa0;mg twice daily of (DMF, delayed release formulation).</p>
</fn>
<fn>
<p>
<sup>&#x22EE;</sup>: Whenever not otherwise specified, the dose might be assumed as 240&#xa0;mg/twice die, which is usually referred to as the recommended therapy (<xref ref-type="bibr" rid="B184">Storm Larsen et al., 2019</xref>; Phillips et al., 2015).</p>
</fn>
<fn>
<p>
<sup>&#x2058;</sup>: Authors defined the dosage of <italic>in vitro</italic> treatments as 1.6&#xa0;mg/mL DMF, and 0.46&#xa0;mg/mL fumaric acid, but did not state the dose administered to patients participating in the study.</p>
</fn>
</table-wrap-foot>
</table-wrap>
<sec id="s4-1">
<title>4.1 Cardiovascular diseases</title>
<p>Several cardiovascular diseases, such as hypertension, atherosclerosis, diabetic cardiomyopathy, myocardial infarction, and stroke, are exacerbated by inflammation or oxidative stress (<xref ref-type="bibr" rid="B12">Bai et al., 2021</xref>; <xref ref-type="bibr" rid="B191">Tian et al., 2023</xref>). Studies on rat models of dexamethasone (DEX) and high-fat-diet-induced programmed hypertension (<xref ref-type="bibr" rid="B66">Hsu et al., 2019</xref>; <xref ref-type="bibr" rid="B105">Lin et al., 2018</xref>) revealed that 50&#xa0;mg/kg/day of DMF induced upregulation of <italic>Nrf2</italic> mRNA expression, along with a decrease in asymmetric dimethylarginine (ADMA) plasma levels, and the downregulation of the renin&#x2013;angiotensin system. The mechanisms through which the Nrf2 pathway can exert protective effects against inflammatory processes have been already discussed; reduced ADMA levels correlate with increased NO availability, which prevents DEX- and high-fat-diet-induced hypertension. A concomitant increase in mRNA levels of <italic>UNC-51-like kinase-1</italic> (<italic>Ulk1</italic>), <italic>Ppargc1a</italic>, and <italic>autophagy-related gene 5</italic> (<italic>Atg5</italic>) was also observed. An <italic>in vivo</italic> model of gestational hypertension in rats revealed that DMF oral treatment (25&#xa0;mg/kg) decreases mRNA and protein levels of ten-eleven translocation 1 (TET1) and calcium-activated potassium channel subunit &#x3b2;1 (KCNMB1) (<xref ref-type="bibr" rid="B213">Zhou et al., 2021</xref>); TET1 is upregulated by estrogen during pregnancy and increases KCNMB1 level, which is associated with hypertension (<xref ref-type="bibr" rid="B54">Han et al., 2017</xref>).</p>
<p>DMF has been shown to decrease the severity of ischemic-derived neuronal damage in <italic>vivo</italic> mouse and rat models of middle cerebral artery occlusion (MCAO) and bilateral common carotid artery (BCCA) occlusion (<xref ref-type="bibr" rid="B104">Lin et al., 2016</xref>; <xref ref-type="bibr" rid="B204">Yao et al., 2016</xref>; <xref ref-type="bibr" rid="B57">Hatware and Akula, 2017</xref>; <xref ref-type="bibr" rid="B165">Safari et al., 2019</xref>; <xref ref-type="bibr" rid="B65">Hou et al., 2020</xref>; Owjfard et al., 2021). The dosage of DMF administered to the MCAO animal models varied through studies: 25 or 50&#xa0;mg/kg twice daily (<xref ref-type="bibr" rid="B104">Lin et al., 2016</xref>), 30 or 45&#xa0;mg/kg twice daily (<xref ref-type="bibr" rid="B204">Yao et al., 2016</xref>), 15&#xa0;mg/kg twice daily (<xref ref-type="bibr" rid="B165">Safari et al., 2019</xref>), 12.5&#xa0;mg/kg twice daily (<xref ref-type="bibr" rid="B65">Hou et al., 2020</xref>), 30&#xa0;mg/kg daily (Owjfard et al., 2021). The outcomes of experiments testing various doses revealed that DMF&#x2019;s protective properties are dose-dependent. The reduction of infarction volume, a DMF-induced rise in Nrf2 and HO-1 expression levels, a decrease in pro-inflammatory mediators like IL-1 and TNF, an increase in anti-inflammatory mediators like IL-10, and a suppression of T cell and neutrophil infiltration were all observed outcomes in the studies mentioned above. Nrf2 pathway activation was also identified as the main mechanism of action leading to the neuroprotective effects of DMF in rats and mice models of subarachnoid hemorrhage and intracerebral hemorrhage (<xref ref-type="bibr" rid="B73">Iniaghe et al., 2015</xref>; <xref ref-type="bibr" rid="B113">Liu et al., 2015</xref>; <xref ref-type="bibr" rid="B210">Zhao et al., 2015</xref>). Additionally, <italic>in vivo</italic> models of myocardial infarct demonstrated that 10&#xa0;mg/kg of DMF reduced the infarct size by inhibiting NF-&#x3ba;B (<xref ref-type="bibr" rid="B125">Meili-Butz et al., 2008</xref>) and counteracting left ventricle wall thinning, concurrently improving collagen deposition, angiogenesis and myofibroblasts activation in the damaged area (<xref ref-type="bibr" rid="B134">Mouton et al., 2021</xref>). Reperfusion injury is a direct consequence of the interruption in blood flux. DMF has been tested in two <italic>in vitro</italic> models of reperfusion injury to determine how well it protects against damage caused by this condition because inflammation and oxidative stress are both involved (<xref ref-type="bibr" rid="B91">Kuang et al., 2020</xref>; <xref ref-type="bibr" rid="B209">Zhao et al., 2020</xref>). Both studies employed H9c2 cardiomyoblasts, subjected to oxygen-glucose deprivation/reoxygenation (OGD/R) and treated with 10 or 20&#xa0;&#xb5;M of DMF. They found that Nrf2 was upregulated, apoptotic cell death indicators were suppressed, ROS generation was reduced, and adhesion molecules were downregulated. More recent studies have observed the Nrf2-dependent protective and anti-inflammatory effect of DMF (15, 25, 45 or 100&#xa0;mg/kg) on <italic>in vivo</italic> models of MCAO/reperfusion (<xref ref-type="bibr" rid="B102">Li et al., 2021b</xref>), myocardial ischemia-reperfusion injury in diabetic rats (<xref ref-type="bibr" rid="B199">Wang et al., 2023</xref>), and hepatic (<xref ref-type="bibr" rid="B187">Takasu et al., 2017</xref>; <xref ref-type="bibr" rid="B70">Ibrahim et al., 2020</xref>; <xref ref-type="bibr" rid="B155">Qi et al., 2023</xref>), intestinal (<xref ref-type="bibr" rid="B43">Gendy et al., 2021</xref>), cutaneous (<xref ref-type="bibr" rid="B74">Inoue et al., 2020</xref>) and renal (<xref ref-type="bibr" rid="B156">Ragab et al., 2020</xref>; <xref ref-type="bibr" rid="B211">Zhen et al., 2021</xref>) ischemia/reperfusion injury. Myocardial infarctions and ischemic strokes are both primarily caused by atherosclerosis because advanced atheromatous plaques are prone to rupture. <italic>In vivo</italic> models of diabetes or high-cholesterol-diet-induced atherosclerosis demonstrated that 25&#xa0;mg/kg (<xref ref-type="bibr" rid="B118">Luo et al., 2019</xref>) and 12.5&#xa0;mg/kg (<xref ref-type="bibr" rid="B143">Nour et al., 2017</xref>) of DMF induce the activation of the Nrf2 pathway, reduce aortic oxidation and serum TC, TGs, and LDL cholesterol. Moreover, a recent <italic>in vitro</italic> and <italic>in vivo</italic> study shows that 25&#xa0;mg/kg of DMF inhibits the maturation and the migration of activated dendritic cells, which play an important role in atheromatous plaque rupture (<xref ref-type="bibr" rid="B186">Sun et al., 2022b</xref>). Diabetes can also result in cardiovascular symptoms; the impact of DMF on these consequences was examined in numerous recent research using <italic>in vivo</italic> models of streptozotocin-induced diabetes (<xref ref-type="bibr" rid="B67">Hu et al., 2018</xref>; <xref ref-type="bibr" rid="B103">Li et al., 2018</xref>; <xref ref-type="bibr" rid="B8">Amin et al., 2020</xref>; <xref ref-type="bibr" rid="B115">Lone et al., 2020</xref>), high-fat-diet-induced diabetes (<xref ref-type="bibr" rid="B117">Lu et al., 2017</xref>), or autoimmune diabetes (<xref ref-type="bibr" rid="B101">Li et al., 2021a</xref>). DMF treatment (with the administered dose ranging from 10 to 80&#xa0;mg/kg) leads to a Nrf2-dependent protection against diabetic-induced myocardial injury and nephropathy, and to an improvement in wound healing. In the autoimmune model, DMF (25&#xa0;mg/kg) delayed or prevented the onset of diabetes, and attenuated the levels of pro-inflammatory cytokines (<xref ref-type="bibr" rid="B101">Li et al., 2021a</xref>). Moreover, a streptozotocin- and high-fat-diet-induced diabetic rat model showed that DMF (25&#xa0;mg/kg), administered alone or in combination with glibenclamide, alleviated fatty liver symptoms, usually associated with type II diabetes (<xref ref-type="bibr" rid="B35">Dwivedi and Jena, 2023</xref>).</p>
<p>An <italic>in vivo</italic> model of Vitamin D3-induced calcification underlined a preventive effect of DMF (25 or 50&#xa0;mg/kg) against vascular calcification through the Nrf2-dependent regulation of genes linked to osteoblast-like phenotype and the reduction of calcium deposit (<xref ref-type="bibr" rid="B51">Ha et al., 2014</xref>). A recent study on an <italic>in vivo</italic> model of murine-elastase-induced aneurysm demonstrates the neuroprotective and preventive effects of 100&#xa0;mg/kg DMF (Pascale et al., 2020). Lastly, DMF (25&#xa0;mg/kg) has also been shown to reduce oxidative stress and inflammation in a rat model of isoproterenol-induced cardiac hypertrophy, resulting in a decrease in heart rate and blood pressure and heart-to-body weight ratio (<xref ref-type="bibr" rid="B3">Ahmed et al., 2018</xref>).</p>
<p>Notably, studies on patients affected by either plaque psoriasis or MS also report cardioprotective effects of DMF treatment (<xref ref-type="bibr" rid="B171">Schmieder et al., 2015</xref>; <xref ref-type="bibr" rid="B16">Blumenfeld Kan et al., 2019</xref>; <xref ref-type="bibr" rid="B64">Holzer et al., 2020</xref>). Patients affected by moderate-to-severe plaque psoriasis and treated with DMF showed a significant increase in serum levels of adiponectin (<xref ref-type="bibr" rid="B171">Schmieder et al., 2015</xref>) and decreases in apolipoprotein B and total cholesterol levels (<xref ref-type="bibr" rid="B64">Holzer et al., 2020</xref>). Blumenfeld Kan et al. observed a cohort of patients affected by multiple sclerosis and treated either with DMF or with fingolimod; the study reported increases in HDL level, HDL/LDL ratio and HDL/total cholesterol ratio, with no concurrent increase in LDL levels following both treatments.</p>
</sec>
<sec id="s4-2">
<title>4.2 Neurodegenerative diseases</title>
<p>Neurodegenerative diseases, e.g., Alzheimer&#x2019;s disease, Parkinson&#x2019;s disease, Huntington&#x2019;s disease, amyotrophic lateral sclerosis, are characterized, among other features, by inflammation, oxidative stress, and the slow, progressive death of neurons (<xref ref-type="bibr" rid="B50">Guo et al., 2022</xref>; <xref ref-type="bibr" rid="B190">Teleanu et al., 2022</xref>). Thus, antioxidative and anti-inflammatory properties are sought after qualities in any therapeutic approach in these pathological contexts. Developing an animal model that reliably reflects the complexity of neurodegenerative diseases is still challenging, and several models aim to duplicate their main pathological features with different strategies. Studies on <italic>in vivo</italic> models of Alzheimer&#x2019;s disease (AD) have demonstrated the efficacy of DMF therapy in reducing spatial memory and cognitive impairments, attenuating inflammation and oxidative stress and decreasing neurodegeneration. Majkutewicz et al. used an <italic>in vivo rat</italic> model of sporadic AD induced by intracerebroventricular injection of streptozotocin (STZ), and administered DMF through the chow (0.4% of food weight, corresponding to 44&#xa0;mg/kg daily). DMF treatment led to protective effects against neurodegeneration in the hippocampus and basal forebrain and functional improvements in the Morris water maze test performance (<xref ref-type="bibr" rid="B121">Majkutewicz et al., 2016</xref>). The therapeutic effects exhibited by DMF were more significant in older rats compared to young animals (<xref ref-type="bibr" rid="B119">Majkutewicz et al., 2018</xref>). More recently, DMF was demonstrated to reduce the number of lymphocytes and the serum levels of IL-6 and IFN-&#x3b3; (<xref ref-type="bibr" rid="B203">Wrona et al., 2022</xref>), and to improve neurogenesis and BDNF-related neuroprotection (<xref ref-type="bibr" rid="B93">Kurowska-Ruci&#x144;ska et al., 2022</xref>) in the same STZ-induced model. Transgenic animal models of amyloidosis were used to test neuroprotective properties of DMF, leading to conflicting results. In particular, a daily dose of 100&#xa0;mg/kg of DMF reduces motor dysfunctions and improves cognitive function through the activation of the Nrf2 pathway in a transgenic mouse model of combined amyloidosis and tauopathy (<xref ref-type="bibr" rid="B160">Rojo et al., 2018</xref>), whereas no protective effect is observed after DMF treatment (75&#xa0;mg/kg) in a mouse model combining overexpressed amyloid precursor protein and mutated presenilin-1 (<xref ref-type="bibr" rid="B130">Mohle et al., 2021</xref>). However, the difference between the two studies may be attributed to the timeline and length of treatment, which was not uniform among the two. Improvements in cognitive function and spatial memory, together with decreases in neurodegeneration of hippocampus and astrocyte activation, were also observed after DMF treatment (45&#xa0;mg/kg) in a rat model of postmenopausal dementia (<xref ref-type="bibr" rid="B1">Abd El-Fatah et al., 2021</xref>). In another recent study using hippocampal injection of amyloid &#x3b2; and ibotenate acid to induce neurodegeneration, inflammation and memory impairment, a daily dose of DMF (48&#xa0;mg/kg) reduced inflammation and oxidative stress in a Nrf2-dependent manner (<xref ref-type="bibr" rid="B185">Sun et al., 2022a</xref>). Recently, it has been suggested that transplantation of mesenchymal stem cells (MSCs) could represent a promising therapeutic option in neurodegenerative contexts; however, the potential of this treatment is hindered by the poor survival rate of MSCs after transplantation. A recent study demonstrated that preconditioning of MSCs cells with DMF leads to an increased survival rate and Nrf2 expression <italic>in vitro</italic>, and enhances MSCs efficacy in rescuing learning and spatial memory deficits in a rat model of amyloid &#x3b2;-induced AD (<xref ref-type="bibr" rid="B11">Babaei et al., 2023</xref>).</p>
<p>DMF has also been tested in <italic>vivo</italic> models of Parkinson&#x2019;s disease (PD). Treatment with 50&#xa0;mg/kg of DMF, administered prior to 6-hydroxy-dopamine (6-OHDA) lesioning, attenuated the loss of dopaminergic neurons, the decrease in dopamine levels and the activation of astrocytes and microglia (<xref ref-type="bibr" rid="B79">Jing et al., 2015</xref>). This mitigation of astrogliosis and microgliosis was also observed in a transgenic mouse model expressing human &#x3b1;-synuclein into the substantia nigra pars compacta, to which 100&#xa0;mg/kg of DMF were administered daily for 1 and 3 weeks, and every other day for 8 weeks after vector delivery (<xref ref-type="bibr" rid="B96">Lastres-Becker et al., 2016</xref>). The study also reported a decrease in &#x3b1;-synuclein-mediated toxicity in dopaminergic neurons and an increase in intracellular levels of the protective factors NQO1 and oxidative stress induced growth inhibitor 1 (OSGIN1). Two studies describe DMF&#x2019;s neuroprotective properties in a well-known mouse model of PD established through 1-methyl-4-phenyl-1,2,3,6-tetrahydropyridine (MPTP) injection (<xref ref-type="bibr" rid="B4">Ahuja et al., 2016</xref>; <xref ref-type="bibr" rid="B19">Campolo et al., 2017</xref>). In the former study, DMF treatments (10, 50, 100&#xa0;mg/kg) started 1&#xa0;day before MPTP administration and continued for 5 days after. Campolo et al. administered 10, 30, 100&#xa0;mg/kg of DMF, starting 1&#xa0;day after MPTP injection and continuing through 7 additional days after MPTP. DMF treatments prevent MPTP-induced loss of dopaminergic neurons and striatal dopamine, depletion of tyrosine hydroxylase, GSH and dopamine transporter, and reduce cellular levels of nitrative stress marker 3-nitrotyrosine (3-NT), TNF-&#x3b1;, monocyte chemoattractant protein-1 (MCP-1), &#x3b1;-synuclein oligomers, NF-&#x3ba;B and other oxidative stress or inflammatory markers. More recently, DMF (15&#x2013;30&#x2013;60&#xa0;mg/kg) has been administered to a rotenone-induced mouse model of PD, leading to improvements in the rotenone-induced motor deficits and to decreases in the levels of &#x3b1;-synuclein in brain sections (<xref ref-type="bibr" rid="B86">Khot et al., 2023</xref>). Results from this study also remarked a DMF-induced activation of the autophagic pathway, and an inhibition of apoptosis and inflammatory cytokines.</p>
<p>Another study on DMF focused on the <italic>DJ-1&#x3b2;</italic> gene in <italic>Drosophila</italic>, considered to be an ortholog of human <italic>DJ-1</italic>. The DJ-1 gene is one of the genes involved in familial types of the PD and involved in both mitochondrial homeostasis and cellular defense against oxidative stress. DMF treatment partially reversed the motor deficits of this <italic>in vivo</italic> model, concurrently decreasing H<sub>2</sub>O<sub>2</sub> and protein carbonylation levels and increasing phosphofructokinase activity (<xref ref-type="bibr" rid="B182">Solana-Manrique et al., 2020</xref>). In humans, a case report shows improvements in PD symptoms in a single patient affected by psoriasis and treated with DMF, administered daily starting from a dose of 30&#xa0;mg and progressively increased to 720&#xa0;mg at week 9 and beyond. The authors described improvements in working memory, writing, speech and motor coordination, combined with a reduction in tremor and facial hypomimia, likely due to DMF (<xref ref-type="bibr" rid="B39">Filippi et al., 2022</xref>).</p>
<p>Huntington&#x2019;s disease (HD) research has also assessed the efficacy of DMF. R6/2 and YAC128 mice are two HD models, carrying a fragment of the human mHtt gene containing CAG repeats or the full gene, respectively; DMF counteracted motor impairment and increased the portion of preserved neurons in the striatum in both <italic>in vivo</italic> models, also leading to upregulation of Nrf2 immunoreactivity in neurons, an index of restored endogenous neuroprotection (<xref ref-type="bibr" rid="B36">Ellrichmann et al., 2011</xref>). In another study, rats were injected with 3-nitropropionic acid to induce selective progressive striatal degeneration. DMF (25&#xa0;mg/kg) restored motor function, reduced neurodegeneration, and inhibited apoptosis (<xref ref-type="bibr" rid="B56">Hassab et al., 2023</xref>).</p>
<p>A Phase II randomised, placebo-controlled, double-blind clinical trial assessed the efficacy and safety of DMF in amyotrophic lateral sclerosis (ALS) patients (<xref ref-type="bibr" rid="B198">Vucic et al., 2021</xref>). Participants were administered either placebo or 480&#xa0;mg or DMF daily, and efficacy measures were analysed at week 36. Specifically, changes in the ALS Functional Rating Scale-Revised, survival, quality of life, respiratory function, neurophysiological index (NI), and urinary neurotrophin-receptor p75 levels were evaluated. Except for a reduction in NI decline, DMF showed no significant effect in the other outcome measures, therefore the trial provided evidence for safety but lack of efficacy of DMF in ALS. However, the therapeutic potential of DMF in ALS may be better investigated on <italic>in vivo</italic> models of the disease, or through clinical trials on patients at different stages of the pathology, to account for potential differences in DMF&#x2019;s efficacy on varying degrees of severity.</p>
<p>Clinical trials on DMF in any other mentioned neurodegenerative disease have not been yet carried out.</p>
</sec>
<sec id="s4-3">
<title>4.3 Respiratory pathologies</title>
<p>Complementary to the above-mentioned evidence in the context of cardiovascular diseases, DMF treatment exerts beneficial effects in experimental models of pulmonary arterial hypertension and lung fibrosis (<xref ref-type="bibr" rid="B49">Grzegorzewska et al., 2017</xref>). In particular, DMF (90&#xa0;mg/kg) mitigated oxidative stress damage and inflammation in lungs of chronically hypoxic mice and showed protective effects in pulmonary arterial vascular smooth muscle cells and lung fibroblasts from human subjects. In agreement with this, <italic>in vivo</italic> studies confirmed the efficacy of DMF in an age-dependent persistent lung fibrosis mouse model (<xref ref-type="bibr" rid="B83">Kato et al., 2022</xref>). Lung-targeted (inhaled) delivery of 80&#xa0;&#x3bc;g and systemic (oral) delivery of 240&#xa0;&#x3bc;g of DMF, administered daily for 3&#x2013;6 weeks post-injury, were compared in an aging murine model of bleomycin-induced non-resolving lung fibrosis; notably, only inhaled DMF restored lung Nrf2 levels, reduced lung oxidative stress, and promoted the fibrosis resolution. Relevant in the context of idiopathic pulmonary fibrosis, DMF-loaded ROS-responsive liposomes (containing DMF 0.5, 2, or 5&#xa0;mg/kg) administered by inhalation attenuated lung fibrosis in animals through Nrf2 pathway upregulation (<xref ref-type="bibr" rid="B110">Liu C et al., 2022</xref>; <xref ref-type="bibr" rid="B111">Liu J et al., 2022</xref>); such a promising beneficial profile in a preclinical study clearly opens a new perspective for the DMF use in this clinical condition. Moreover, inhalation of 6&#xa0;mg of DMF-encapsulated nanoparticles attenuated clinical signs of EAE and pulmonary inflammatory dysfunction in mice (<xref ref-type="bibr" rid="B153">Pinto et al., 2022</xref>).</p>
<p>Regarding a potential use of DMF in airways diseases, this drug has been anecdotally reported to reduce asthma symptoms in patients with psoriasis and asthma, and to provide beneficial effects on primary human lung cells (<xref ref-type="bibr" rid="B174">Seidel and Roth, 2013</xref>). In an experimental <italic>in vivo</italic> model of allergic asthma, intranasal administration of DMF (0.5&#xa0;mg/kg) 30&#xa0;min before the exposure to house dust led to a significant abrogation of the outcomes: DMF-treated animals showed reduced dust-induced airway inflammation, mucous cell metaplasia, and airway hyperactivity to inhaled methacholine (<xref ref-type="bibr" rid="B76">Jaiswal et al., 2019</xref>). Mechanistically, the anti-inflammatory effects of DMF were ascribed to interference with the migration of lung dendritic cells to mediastinal lymph nodes, and consequently to attenuation of allergic sensitization and Th2 immune response.</p>
<p>In the context of acute lung injury, in mice that underwent intratracheal instillation of lipopolysaccharide, a single dose of DMF (90&#xa0;mg/kg by intrapetitoneal injection) ameliorated pulmonary injury and edema, and reduced infiltration of inflammatory mediators (<xref ref-type="bibr" rid="B99">Li et al., 2022a</xref>). In a mouse model of lung inflammation and oxidative stress induced by chronic exposure to diesel exhaust particles, animals exposed for 30 days to the toxic stimulus, and then to concomitant administration of DMF (30&#xa0;mg/kg of DMF by gavage) for additional 30&#xa0;days, showed reduced lung injury and inflammation, as well as lower oxidative stress, than their counterparts not treated with DMF (<xref ref-type="bibr" rid="B21">Cattani-Cavalieri et al., 2020</xref>).</p>
<p>In a mouse model of TNF-&#x3b1;-induced systemic inflammatory response syndrome, 50&#xa0;mg/kg of DMF markedly suppressed the lesions of lung, as well as of cecum and uterus, concomitantly with a reduced production of pro-inflammatory cytokines (<xref ref-type="bibr" rid="B178">Shi et al., 2023</xref>); these DMF-protective effects were linked to inhibition of necroptosis triggered by TNF-&#x3b1; stimulation, suggesting for the first time that DMF may act as a necroptosis inhibitor.</p>
<p>Of interest for the recent pandemic coronavirus disease (COVID-19) and other viral infections, <italic>in vitro</italic> evidence showed that DMF 150&#x2013;200&#xa0;&#x3bc;M induces an interferon-independent antiviral program broadly effective in limiting virus replication and in suppressing the pro-inflammatory responses of various human pathogenic viruses, such as Herpes Simplex Virus-1 and-2, Zika virus, Vaccinia virus, Severe Acute Respiratory Syndrome Coronavirus 2 (<xref ref-type="bibr" rid="B146">Olagnier et al., 2020</xref>).</p>
<p>In virtue of its immunomodulatory and anti-inflammatory properties, the utility of DMF treatment in COVID-19 patients&#x2014;especially those experiencing the cytokine storm&#x2014;has been suggested (<xref ref-type="bibr" rid="B192">Timpani and Rybalka, 2020</xref>). A systematic review and network meta-analysis assessed the effect of disease-modifying therapies (DMTs) on COVID-19 gravity in MS patients, showing that DMF, as the majority of DMTs, was associated with a decreased risk of severe COVID-19 (<xref ref-type="bibr" rid="B13">Barzegar et al., 2022</xref>). Notably, a large data analysis from 12 data sources in 28 countries evaluating COVID-19 severity outcomes used DMF as a reference to compare other DMTs, confirming its favourable profile (<xref ref-type="bibr" rid="B180">Simpson-Yap et al., 2021</xref>). In agreement, a small descriptive study reported that 43/51 of MS patients taking DMTs including DMF experienced mild COVID-19, not requiring hospitalization (<xref ref-type="bibr" rid="B6">Al-Shammri et al., 2023</xref>); similarly, another study displayed that the same DMTs were not associated with an increased risk of severe COVID-19 (<xref ref-type="bibr" rid="B181">Smith et al., 2022</xref>). These evidences are encouraging; however, further retrospective studies in human subjects under DMF treatment and infected by COVID-19 would be useful to determine the factual capability of DMF in modulating the host immune response to SARS-CoV-2 infection and preventing excessive inflammation and tissue injury associated with COVID-19 pathology in the airway and beyond.</p>
</sec>
<sec id="s4-4">
<title>4.4 Gastrointestinal pathologies</title>
<p>The gastro-enteric tract plays a central role in the maintenance of health homeostasis, for both its obvious part in nutrient absorption and its residing microbiota, which is closely connected to immunological as well as metabolic functions (<xref ref-type="bibr" rid="B2">Adak and Khan, 2019</xref>). Moreover, several studies suggest the involvement of the gut microbiome in the development of a number of pathologies, e.g., MS (<xref ref-type="bibr" rid="B154">Preiningerova et al., 2022</xref>), psoriasis (<xref ref-type="bibr" rid="B17">Buhas et al., 2022</xref>).</p>
<p>Recent evidence suggests a potential connection between the adverse effects of DMF treatment and its effects on gut microbiota. Changes in the composition of gut microbiota under DMF treatment have been indeed proposed as potential risk factors for lymphopenia (<xref ref-type="bibr" rid="B29">Diebold et al., 2022</xref>) and GI tract symptoms (<xref ref-type="bibr" rid="B184">Storm-Larsen et al., 2019</xref>). On the other hand, both preclinical studies on <italic>in vivo</italic> models and clinical studies on psoriasis patients have demonstrated some benefic properties exerted by DMF on the composition of the microbiota (<xref ref-type="bibr" rid="B37">Eppinga et al., 2017</xref>; <xref ref-type="bibr" rid="B120">Ma et al., 2017</xref>), suggesting a more complex interaction between the two.</p>
<p>Ma et al. administered DMF to BALB/c mice (0.05% of the feed administered to the animals) and observed remarkable improvements in the gut barrier, in growth performance and mucosal morphology, combined with increases in the diversity of the microbiota and its healthier composition. This led the Authors to conclude that DMF positively modulates absorption of nutrients and microbiota richness.</p>
<p>Eppinga et al. reported that DMF treatment restored <italic>Saccharomyces cerevisiae</italic> levels in a cohort of patients affected by plaque psoriasis; however, the study also underlines a positive correlation between higher amounts of <italic>S. cerevisiae</italic> and GI tract symptoms, suggesting that its higher abundance might lead to less favourable effects.</p>
<p>On MS patients, several clinical studies on subjects undergoing DMF treatment analysed the composition of the gut microbiome (<xref ref-type="bibr" rid="B84">Katz Sand et al., 2019</xref>; <xref ref-type="bibr" rid="B184">Storm-Larsen et al., 2019</xref>; <xref ref-type="bibr" rid="B29">Diebold et al., 2022</xref>; <xref ref-type="bibr" rid="B38">Ferri et al., 2023</xref>), observing changes in the relative abundance of different subpopulations. Some of the detected DMF-induced alterations, e.g., decreases in <italic>Clostridium</italic> (<xref ref-type="bibr" rid="B38">Ferri et al., 2023</xref>) and proinflammatory <italic>taxa</italic> like <italic>A. muciniphilia</italic> and <italic>C. eutactus</italic> levels and increases in anti-inflammatory species like <italic>L. pentosus</italic> (<xref ref-type="bibr" rid="B29">Diebold et al., 2022</xref>), potentially suggest that a positive modulation of the gut microbiome could represent an additional therapeutic mechanism of DMF.</p>
<p>DMF has also been shown to improve other aspects of the health of the GI tract. A study on the intestinal permeability (IP) and circulating CD161<sup>&#x2b;</sup>CCR6<sup>&#x2b;</sup>CD8<sup>&#x2b;</sup>T cells in 25&#xa0;MS patients underlined a significant decrease in the observed lymphocytic population after 9&#xa0;months of DMF treatment (<xref ref-type="bibr" rid="B18">Buscarinu et al., 2021</xref>). The Authors also registered a significant correlation between circulating CD161<sup>&#x2b;</sup>CCR6<sup>&#x2b;</sup>CD8<sup>&#x2b;</sup>T cells, IP changes and the clinical MRI parameters considered in the study, concluding that a modulation of this subset of T-cells could then correlate with disease course and therapy.</p>
<p>Evidence on the protective properties of DMF on the gastroenteric system also comes from <italic>in vivo</italic> models of colitis; DMF (10, 30, and 100&#xa0;mg/kg) administered to a murine model of dinitrobenzene sulphuric acid (DNBS)-induced colitis reduced weight loss, hemorrhagic diarrhoea, colon injury, and colonic TNF-&#x3b1; and IL-1&#x3b2; levels (<xref ref-type="bibr" rid="B20">Casili et al., 2016</xref>). DMF also reduced NF-&#x3ba;B p65 nuclear expression, DNBS-induced lipid peroxidation through the regulation of Mn-superoxide dismutase, myeloperoxidase (MPO) activity and intracellular adhesion molecule (ICAM-) 1 levels, which contributes to cell recruitment during the inflammatory process. Two studies confirmed the same antioxidant and anti-inflammatory properties of DMF on dextran sulfate sodium (DSS)-induced colitis (<xref ref-type="bibr" rid="B112">Liu et al., 2016</xref>; <xref ref-type="bibr" rid="B100">Li et al., 2020</xref>). In the first case, 30 and 60&#xa0;mg/kg of DMF were administered to mice after exposure to DSS for 7 days. DMF led to a dose-dependent attenuation of DSS-induced body weight decrease, colon shortening and splenomegaly, to the suppression of MPO and inducible nitric oxide synthase activity, to the reduction of inflammatory cell infiltration, of pro-inflammatory cytokine production and NLPR3 inflammasome activation. DMF also restored Nrf2 protein level and <italic>NQO1</italic> and <italic>H O -1</italic> expression; <xref ref-type="bibr" rid="B100">Li et al. (2020)</xref> further investigated in the DSS-induced colitis model the DMF&#x2019;s effect on the gut antioxidant system, with specific focus on glutamate-cysteine ligase catalytic subunit (GCLC), glutathione peroxidase (GPX) and COX-2. The administration of 25&#xa0;mg/kg of DMF led to a significant increase in GCLC and GPX expression, and to a reduction in the expression of inflammatory mediator COX-2.</p>
<p>In a murine model of postoperative ileus, induced via intestinal manipulation (IM), animals were administered DMF intraperitoneally (30&#xa0;mg/kg) or intragastrically (100&#xa0;mg/kg) 24&#xa0;h prior to IM. DMF pretreatment prevented the impairment of GI motility which characterizes postoperative ileus, reduced IL-6 levels and leukocyte infiltration, and reduced NF-&#x3ba;B and ERK 1/2 activation (<xref ref-type="bibr" rid="B197">Van Dingenen et al., 2019</xref>).</p>
<p>Intestinal damage was also reduced in an <italic>in vivo</italic> model of necrotizing enterocolitis (NEC), in which 25&#xa0;mg/kg of DMF attenuated the weight loss, abdominal distension diarrhoea and intestinal injuries derived from NEC (<xref ref-type="bibr" rid="B127">Mi et al., 2023</xref>). In the same animals, at intestinal level DMF also inhibited the expression of pro-inflammatory and pro-apoptotic factors.</p>
<p>The potential repurposing of DMF in the context of chronic inflammatory diseases of the intestine, such as inflammatory bowel disorders and celiac disease, has been extensively discussed in a recent review reporting that DMF actually overturned from main suspect to potential ally against gut disorders (<xref ref-type="bibr" rid="B122">Manai et al., 2022</xref>).</p>
</sec>
<sec id="s4-5">
<title>4.5 Ocular pathologies</title>
<p>The use of DMF has a strong attractiveness also in the ophthalmological context, where it may be beneficial in more than one eye disease (<xref ref-type="bibr" rid="B122">Manai et al., 2022</xref>). The rationale of positioning DMF in ocular pathologies indeed relies on evidence related to several diseases. First, studies of an animal model of MS and patients with RRMS show that systemic administration of DMF mitigates optic neuritis (<xref ref-type="bibr" rid="B214">Zyla et al., 2019</xref>), a demyelinating symptom affecting up to 50% of MS patients who experience monocular vision loss. Evidence-based improvements in optic neuritis, associated with preservation of both peripapillary retinal nerve fiber layer and ganglion cell layer in animal model of MS as well as in MS patients treated with DMF, have been also reported (<xref ref-type="bibr" rid="B214">Zyla et al., 2019</xref>; <xref ref-type="bibr" rid="B206">You et al., 2021</xref>). The beneficial effect on the neural retina in MS seems not to be exclusive of DMF, since a recent prospective study of retinal atrophy in RRMS patients treated with various disease-modifying therapies including DMF shows no difference among treatments (<xref ref-type="bibr" rid="B80">Kabanovski et al., 2023</xref>). However, as the Authors declare, limitations of their cohort study include both the high rate of patients drop out (41 of 109, 37.6%) and the slightly higher proportion of patients with history of optic neuritis (over 70%) and shorter treatment duration in the DMF group, which may have introduced a selection bias.</p>
<p>Two <italic>in vivo</italic> studies of optic nerve injury (<xref ref-type="bibr" rid="B132">Mori et al., 2020</xref>) and light-induced retinal degeneration (<xref ref-type="bibr" rid="B30">Dietrich et al., 2021</xref>) further highlight pro-survival effects of DMF on different cellular layers within the retina. In particular, the former study reports that DMF administration (100&#xa0;mg/kg) protected retinal ganglion cells by degeneration, while the latter study shows a significant reduction in photoreceptors loss after DMF treatment (15 or 30&#xa0;mg/kg). Coherently, intraperitoneal injection of MMF (100&#xa0;mg/kg), the main DMF metabolite, exerted neuroprotective effects in a light-induced retinopathy animal model (<xref ref-type="bibr" rid="B78">Jiang et al., 2019</xref>).</p>
<p>
<italic>In vivo</italic> evidence indicates that DMF treatment (100&#xa0;mg/kg) had a beneficial effect in an experimental autoimmune uveoretinitis rat model and may represent a potential candidate drug for ocular inflammatory diseases (<xref ref-type="bibr" rid="B94">Labsi et al., 2021</xref>). In addition, one pilot study in human subjects showed robust, positive effects of DMF/Fumaderm<sup>&#xae;</sup> administration (600&#x2013;1,200&#xa0;mg/die for 12&#x2013;15&#xa0;months) in counteracting the symptoms of uveitis and cystoid macular edema (<xref ref-type="bibr" rid="B61">Heinz and Heiligenhaus, 2007</xref>). Another case report of cystoid macular edema, probably in the context of age-related macular degeneration (AMD), demonstrated that DMF/Fumaderm<sup>&#xae;</sup> (240&#xa0;mg/day) improves retinal thickness and other symptoms in an old woman followed up for 60&#xa0;months (<xref ref-type="bibr" rid="B88">Kofler et al., 2018</xref>).</p>
<p>An <italic>in vivo</italic> streptozotocin-induced diabetic rat model demonstrated the efficacy of DMF (10&#xa0;mg/kg) in decreasing the retinal expression levels of key enzymes involved in diabetic retinopathy (DR). In particular, DMF administration resulted in a reduction in iNOS and COX-2 retinal levels and an induction of the expression of HO-1, suggesting an attenuation of inflammatory processes and oxidative response in DR (<xref ref-type="bibr" rid="B46">Giunta et al., 2023</xref>).</p>
<p>Concerning AMD, a randomized, open labelled phase II trial (NCT04292080, still recruiting on April the 19<sup>th</sup>, 2023) started in 2022, with the aim to evaluate the safety and efficacy of DMF/Tecfidera<sup>&#xae;</sup> in two groups of patients (treated vs. untreated) with geographic atrophy, the late stage of dry AMD. Specifically, to slow the growth of areas of geographic atrophy, patients will be treated twice a day with 120&#xa0;mg for the first week, and then 240&#xa0;mg for 51 weeks.</p>
<p>Of interest, <italic>in vivo</italic> literature evidence of beneficial effects exerted by MMF, either orally or intraocularly administered, is consistent with the DMF-induced improvement of retinal health (for a comprehensive review, see <xref ref-type="bibr" rid="B122">Manai et al., 2022</xref>).</p>
<p>Subconjunctival injections of DMF (20&#xa0;&#xb5;g) promoted corneal allograft survival in rats undergoing corneal transplantation by inhibiting lymphangiogenesis and macrophage infiltration responsible for transplant rejection (<xref ref-type="bibr" rid="B207">Yu et al., 2021</xref>). Moreover, treatment with DMF (15&#xa0;mg/kg) for 28&#xa0;days pre-infection and 14&#xa0;days post-infection with <italic>Herpes simplex</italic> Virus 1 (HSV1) improved severe keratitis by reducing corneal inflammation in mice (<xref ref-type="bibr" rid="B60">Heiligenhaus et al., 2004</xref>). The antiviral effect of DMF against HSV1 has been recently confirmed <italic>in vitro</italic> by a study also investigating the topical use of DMF loaded in ethosome gel, which displays favourable skin tolerability and safety in human volunteers (<xref ref-type="bibr" rid="B179">Sicurella et al., 2023</xref>). Of interest, recent <italic>in vitro</italic> evidence in human primary retinal endothelial cells showed cytoprotective and antioxidant effects of DMF under high glucose conditions, opening an interesting perspective and rationale for further evaluation of this molecule in retinal pathologies featured by vascular complications, such as diabetic retinopathy (<xref ref-type="bibr" rid="B122">Manai et al., 2022</xref>).</p>
<p>The studies of DMF effectiveness by local application in ocular pathologies, although still limited in number and disease contexts, encourage putting further efforts in the development of novel topical formulations and delivery systems for the eye. Compared to oral treatment, DMF ocular administration by injection or, preferably, eye drops/gel, indeed might allow to have various advantages, such as avoidance or reduction of both systemic side effects and targeting to other organs, and possibility to treat also patients presenting ADME alterations (<xref ref-type="bibr" rid="B122">Manai et al., 2022</xref>).</p>
</sec>
<sec id="s4-6">
<title>4.6 Tumors</title>
<p>DMF&#x2019;s antitumoral properties are being studied in several types of cancer. DMF anti-proliferative effect against tumoral cells is mainly linked to its regulation of the nuclear translocation of NF-kB, of the Nrf2 pathway, of extracellular signal-regulated kinase 1 and 2 (ERK1/2), and p38 mitogen-activated protein kinases (MAPKs), while its suppression of tumor metastasis is connected to inhibition of matrix metalloproteinases (MMPs) and very late antigens (VLAs) (<xref ref-type="bibr" rid="B166">Saidu et al., 2019</xref>; <xref ref-type="bibr" rid="B188">Takeda et al., 2020</xref>). Some of the earliest evidence of DMF&#x2019;s potential in inhibiting tumor growth came from its application to <italic>in vitro</italic> and <italic>in vivo</italic> models of melanoma (<xref ref-type="bibr" rid="B114">Loewe et al., 2006</xref>). DMF (6&#xa0;mg/kg or 20&#xa0;mg/kg) administered daily to a mouse model of melanoma significantly reduced tumor growth, mean tumor volume and tumor metastasis. These results were confirmed and expanded in successive studies, in which DMF was administered alone (<xref ref-type="bibr" rid="B188">Takeda et al., 2020</xref>) or in combination with other therapies (<xref ref-type="bibr" rid="B196">Valero et al., 2010</xref>; <xref ref-type="bibr" rid="B99">Li et al., 2022a</xref>). In particular, <xref ref-type="bibr" rid="B188">Takeda et al., 2020</xref>, administered 10 or 30&#xa0;mg/kg of DMF to a mouse model of melanoma, observing a DMF-induced decrease in tumor growth and increase in survival time. <xref ref-type="bibr" rid="B196">Valero et al., 2010</xref>, analyzed the effects of 20&#xa0;mg/kg of DMF, alone or in combination with alkylating agent dacarbazine; both treatments reduced tumor growth, and their combination delayed metastasis and impaired melanoma cell migration. <xref ref-type="bibr" rid="B98">Li et al., 2022b</xref>, investigated the effect of DMF (6&#xa0;mg/kg) and vemurafenib co-treatment; in agreement with the previously mentioned studies, the Authors showed that tumor growth was significantly impaired by DMF administration, and that DMF enhanced the efficacy of vemurafenib in the group that received the combined treatment.</p>
<p>Early evidence of DMF&#x2019;s anti-tumoral activity was also found in <italic>vivo</italic> studies on azoxymethane (AOM)-induced foci of aberrant crypts in rat colon (<xref ref-type="bibr" rid="B152">Pereira et al., 1994</xref>; <xref ref-type="bibr" rid="B158">Rao et al., 1995</xref>). AOM-induced foci are precancerous lesions used as biomarkers for bioassays of chemopreventive agents; among various screened compounds, <xref ref-type="bibr" rid="B152">Pereira et al., 1994</xref>, found that DMF (400 or 800&#xa0;mg/kg) reduced the yield of AOM-induced foci of aberrant crypts. <xref ref-type="bibr" rid="B158">Rao et al., 1995</xref>, also assayed DMF&#x2019;s efficacy in reducing AOM-induced foci in rat colon, observing a significant inhibition of invasive adenocarcinoma incidence and multiplicity. More recently, DMF (2&#xa0;mg/kg) was shown to potentiate the antitumor activity of mitomycin C in a mouse model of colon cancer (<xref ref-type="bibr" rid="B15">Begleiter et al., 2004</xref>; <xref ref-type="bibr" rid="B167">Saidu et al., 2017</xref>, assayed DMF on both <italic>in vitro</italic> and <italic>in vivo</italic> models; DMF (&#x3e;25&#xa0;&#x3bc;M) proved to have a cytotoxic effect in several cancer lines. Moreover, administration of DMF 20&#xa0;mg/kg to two mice models of colon cancer, provided further <italic>in vivo</italic> evidence of its efficacy in decreasing tumor occurrence and growth, mainly by dampening tumor-promoting chronic inflammation (<xref ref-type="bibr" rid="B167">Saidu et al., 2017</xref>).</p>
<p>Two studies investigate the potential therapeutic value of DMF in the treatment of breast cancer. <xref ref-type="bibr" rid="B31">Digby et al., 2005</xref>, analyzed DMF&#x2019;s efficacy as an anti-inflammatory adjuvant option, administering it through the diet as 0.3% of the food weight to enhance the effect of the novel bioreductive agent RH1 (2,5-diaziridinyl-3-(hydroxymethyl)-6-methyl-1,4-benzoquinone). The Authors did not remark on a significant antitumoral activity of RH1, but they did notice a DMF-induced increase in NQO1, suggesting a beneficial effect on the antioxidative system (<xref ref-type="bibr" rid="B31">Digby et al., 2005</xref>; <xref ref-type="bibr" rid="B82">Kastrati et al., 2016</xref>, reported for the first time the therapeutic efficacy of 30&#xa0;mg/kg of DMF in both <italic>in vitro</italic> and <italic>in vivo</italic> models of breast cancer, observing impaired tumor growth after DMF treatment (<xref ref-type="bibr" rid="B82">Kastrati et al., 2016</xref>).</p>
<p>A phase II randomized, triple-blind controlled trial on 36 patients affected by glioblastoma multiforme (GBM) investigated the effect of DMF administration (240&#xa0;mg three times per day) prior to surgery, followed by standard treatments (radiotherapy and chemotherapy with temozolomide). The study observed serum S100&#x3b2; levels and Kanofsky&#x2019;s performance status (KPS) score, indexes of brain injury and the ability of patients to carry out daily tasks, respectively; the Authors remark no significant change in serum S100&#x3b2; level, but a higher mean KPS score, suggesting that DMF&#x2019;s neuroprotective action might not be due to the prevention of BBB integrity disruption, but to other mechanisms (<xref ref-type="bibr" rid="B128">Milad et al., 2022</xref>). A phase I clinical trial on GBM patients administered DMF along the standard therapies, providing further evidence for the safety of DMF in combination with radio- and chemotherapy in this pathological context (<xref ref-type="bibr" rid="B176">Shafer et al., 2017</xref>).</p>
<p>Other types of tumor, which DMF likely has beneficial effects against, include cutaneous T-cell lymphoma (CTCL) (<xref ref-type="bibr" rid="B141">Nicolay et al., 2016</xref>; <xref ref-type="bibr" rid="B140">Nicolay et al., 2023</xref>), non-small cell lung cancer (NSCLC) (<xref ref-type="bibr" rid="B162">Rupp et al., 2022</xref>), hepatic cancer (<xref ref-type="bibr" rid="B34">Dwivedi and Jena, 2020</xref>), acute myeloid leukemia (AML) (<xref ref-type="bibr" rid="B136">Nachliely et al., 2019</xref>), oral squamous cell carcinoma (OSCC) (<xref ref-type="bibr" rid="B14">Basilotta et al., 2023</xref>).</p>
<p>
<xref ref-type="bibr" rid="B141">Nicolay et al., 2016</xref>, investigated the efficacy of 30&#xa0;mg/kg of DMF in two <italic>in vivo</italic> models of CTCL with different cutaneous localizations of the T-cell infiltrate; DMF proved to be effective in delaying tumor growth, preventing metastasis and inducing cell death in primary tumors and liver metastases. Results from this preclinical study were then translated in a multicentric phase II study (NCT02546440). DMF (starting from 30&#xa0;mg/die, escalating weekly by 30&#xa0;mg/die up to 120&#xa0;mg/die, then by 120&#xa0;mg/d up to a final dose of 720&#xa0;mg/die) was administered to 25 patients with CTCL over a period of 24 weeks; efficacy (assessed through skin involvement, blood involvement, pruritus and quality of life) and safety were then evaluated. In 30.4% of patients a significant (&#x3e;50%) reduction of skin involvement (measured with the Modified Severity-Weighted Assessment Tool) was registered, with better responses shown by patients with high tumor burden in skin and blood. Pruritus also decreased in several patients, and data from blood samples confirmed DMF-induced NF-&#x3ba;B-inhibition. Authors concluded DMF to be an effective therapeutic option for CTCL, with excellent tolerability (<xref ref-type="bibr" rid="B140">Nicolay et al., 2023</xref>).</p>
<p>
<xref ref-type="bibr" rid="B162">Rupp et al., 2022</xref>, administered 30&#xa0;mg/kg of DMF to a mouse model of NSCLC, successfully repressing tumor growth and reducing tumor cell proliferation.</p>
<p>
<xref ref-type="bibr" rid="B34">Dwivedi and Jena, 2020</xref>, used a two-stage model of early hepatic carcinogenesis, established through the administration of thioacetamide (TAA) and diethylnitrosamine (DEN), to test the efficacy of DMF in hepatocarcinogenesis. DMF treatment (25&#xa0;mg/kg) resulted in improvements in all DEN &#x2b; TAA-induced alterations (e.g., decrease in body weight, increase in liver weight, histopathological alterations, apoptosis insensitivity, DNA damage, and dysfunctions in the antioxidant, inflammatory, fibrogenic and regenerative proliferative stress pathways).</p>
<p>In a xenograft mouse model of AML, <xref ref-type="bibr" rid="B136">Nachliely et al., 2019</xref>, combined DMF (0.6&#xa0;mg) with vitamin D derivatives (VDDs); when administered alone, DMF and the VDD reduced tumor size and weight, but the reduction is much more significant when the compounds are administered in combination.</p>
<p>
<xref ref-type="bibr" rid="B14">Basilotta et al., 2023</xref>, administered 30 or 100&#xa0;mg/kg of DMF to an orthotopic mouse model of OSCC; the mass of the tumors, as was the extent of the neutrophilic infiltration, were reduced in a dose-dependent manner. Basilotta and others also observed a significantly higher expression levels of caspase 3, BCL2-associated agonist of cell death, HO-1 and manganese superoxide dismutase in samples obtained from the OSCC mouse model.</p>
<p>Among several observational studies investigating a potential correlation between DMF and cancer, two pharmacovigilance cohort studies evaluated MS patients who were being treated with disease-modifying therapies (DMTs) and who also reported cases of cancer; the two consulted databases were WHO&#x2019;s VigiBase<sup>&#xae;</sup> (<xref ref-type="bibr" rid="B32">Dolladille et al., 2021</xref>) and FDA&#x2019;s Adverse Event Reporting System (<xref ref-type="bibr" rid="B183">Stamatellos et al., 2021</xref>), respectively. The first study analysed 2,40,993 reports related to DMTs prescribed to MS patients, of which DMF made up 10% of cases; the Authors underline a significant association between cancer reporting and DMF treatment, as well as other DMTs like natalizumab, interferon-&#x3b2; and fingolimod. On the other hand, Stamatellos and others considered data from 2004 to 2020, including in their analysis all reports of patients undergoing any of the FDA-approved treatments for MS, but removing cases of patients younger than 9 years old, and receiving concomitant treatment with antineoplastic drugs. None of the DMTs was significantly associated with increased risk of reporting cancer (<xref ref-type="bibr" rid="B183">Stamatellos et al., 2021</xref>). Notably, none of DMF-containing drugs&#x2019; package inserts and reports indicate &#x201c;tumors&#x201d; as contraindications and adverse effects up to now.</p>
</sec>
<sec id="s4-7">
<title>4.7 Other pathologies</title>
<p>The beneficial effects exerted by DMF make it easy to conceive its repurposing in other pathologies whose pathogeneses rely on inflammation and/or an altered immune response. A paradigmatic example is given by systemic lupus erythematosus (SLE) and similar manifestations. This autoimmune disorder (i.e., type III hypersensitivity response) is characterized by the loss of homeostasis of the immune system, which mistakenly attacks healthy tissue leading to the onset of several symptoms, such as painful joint, fever, ulcers, swollen lymph nodes and skin rash (<xref ref-type="bibr" rid="B22">Ceccarelli et al., 2023</xref>). Generally, SLE is associated with cardiovascular comorbidities, which represent the first cause of death (<xref ref-type="bibr" rid="B108">Lisnevskaia et al., 2014</xref>). Different studies demonstrated that DMF is able to reduce plasmablast differentiation and antibody production in SLE (<xref ref-type="bibr" rid="B123">Mauro et al., 2023</xref>) as well as T-cell metabolism and functionality (<xref ref-type="bibr" rid="B85">Kell et al., 2023</xref>). Both studies employed samples obtained from SLE patients, from which cells were isolated and treated with DMF 25&#xa0;&#x3bc;M. Notably, encouraging results were obtained also for discoid lupus erythematosus (Fumaderm<sup>&#xae;</sup> administered orally 1 up to 3 tables per day for 6&#xa0;months) (<xref ref-type="bibr" rid="B195">Tsianakas et al., 2014</xref>) and cutaneous lupus erythematosus (CLE) (Fumaderm<sup>&#xae;</sup>, initially at 20&#xa0;mg of DMF &#x2b;75&#xa0;mg MEF and then increased to 120&#xa0;mg of DMF &#x2b;95&#xa0;mg of MEF), as a result of a phase II clinical trial (NCT01352988) (<xref ref-type="bibr" rid="B92">Kuhn et al., 2016</xref>). Interestingly, as highlighted by Tsianakas and others (2014), different studies and case reports demonstrated the efficacy of DMF in SLE treatment compared with cases in which canonical therapies were ineffective.</p>
<p>DMF may be also useful as adjuvant therapy in sepsis. A strong preventing antioxidant activity of DMF has indeed been observed in a rat model of organ sepsis; 15&#xa0;mg/kg of DMF administered immediately and 12&#xa0;h after sepsis induction resulted in reduced neutrophil infiltration in peripheral organs (i.e., liver, lung), and in the prevention of nitrite/nitrate increase and oxidative damage to lipids (measured through the production of MDA equivalents) and proteins (measured through carbonyl content), and restored superoxide dismutase (SOD) and catalase activity (<xref ref-type="bibr" rid="B47">Giustina et al., 2017</xref>).</p>
<p>The neuroprotective properties of DMF seem to be beneficial also in some hereditary metabolic diseases, as in the case of the X-linked adrenomyeloneuropathy (AMN). This disorder, which is characterized by a plethora of symptoms, also presents spinal cord dysfunction and peripheral neuropathy. When Abcd1-mice, an animal model of adrenomyeloneuropathy, were fed chow containing 100&#xa0;mg/kg of DMF, it had been found that the Nrf2 pathway was rescued, the antioxidant system was improved, and inflammation in the spinal cord was prevented (<xref ref-type="bibr" rid="B157">Ranea-Robles et al., 2018</xref>). In addition, DMF-fed Abcd1<sup>&#x2212;</sup>/Abcd2<sup>&#x2212;/&#x2212;</sup> mice, a model of X-linked adrenoleukodystrophy (X-ALD), showed reversal of astrocytosis, microgliosis, axonal and myelin degeneration in their spinal cord along with an improvement in locomotor function (<xref ref-type="bibr" rid="B157">Ranea-Robles et al., 2018</xref>). In various models of Friedreich&#x2019;s ataxia (FRDA) (reviewed by <xref ref-type="bibr" rid="B175">Seminotti et al., 2021</xref>), DMF, which acts on Nrf2 signaling that appears impaired in this condition, demonstrated promising effects.</p>
<p>Furthermore, other genetic disorders that affect the peripheral nervous system could benefit from DMF treatment, such as Friedrich&#x2019;s ataxia (reviewed by <xref ref-type="bibr" rid="B175">Seminotti et al., 2021</xref>). Particularly, orally administration of DMF (110&#xa0;mg/kg/day) was able to rescue mitochondrial gene expression in brain and to restore frataxin expression in brain, cerebellum, and quadriceps muscle in a mouse model of Friedrich&#x2019;s ataxia (<xref ref-type="bibr" rid="B69">Hui et al., 2021</xref>). These results were corroborated by another study based on animal models and human patients. Similar to the previous study, Friedrich&#x2019;s ataxia subjects were treated using the approved protocol of 240&#xa0;mg twice daily for 3&#xa0;months (<xref ref-type="bibr" rid="B77">Jasoliya et al., 2019</xref>). The Nrf2-dependent mechanism of action of DMF is particularly intriguing in the context in Friedreich&#x2019;s ataxia since the only drug recently approved by FDA for the treatment of these patients works by acting on the Nrf2 pathway (<xref ref-type="bibr" rid="B27">Dayalan Naidu and Dinkova-Kostova, 2023</xref>).</p>
</sec>
</sec>
<sec sec-type="conclusion" id="s5">
<title>5 Conclusion</title>
<p>The present work highlights the potential of DMF as stand-alone or adjuvant therapy in several disorders beyond psoriasis and RRMS. Considering its critical role in the modulation of various signaling networks associated with multiple physiological and pathological processes (e.g., oxidative damage, inflammation, and autophagy), DMF appears to be a versatile molecule with a wide spectrum of possible therapeutic applications. Although the anticancer mechanism of action remains elusive, several reports indicate that DMF may be an effective inhibitor of cancer cell growth, and thus potentially useful in breast and lung cancers, glioblastomas, and T-cell lymphoma. In addition, due to its involvement in diverse biological activities, including vascular protective effects, DMF has the potential to be repurposed as a therapeutic agent for patients with cardiovascular diseases. Likewise, with its combination of antioxidant and anti-inflammatory effects, DMF represents a promising neuroprotective molecule in the management of neurodegenerative diseases. Other recent evidence indicates that DMF has effects at ocular level, opening a new perspective for its repositioning in eye pathologies characterized by oxidative stress and inflammation. Studies on the gut microbiota also demonstrate a rearrangement of specific <italic>taxa</italic> upon DMF treatment with a decrease of proinflammatory <italic>taxa</italic> and an increase in beneficial anti-inflammatory species; moreover, literature on DMF and gut disorders intriguingly demonstrates its potential applications in inflammatory and immune-mediated intestinal diseases.</p>
<p>The evidence collected in this review highlights the efficacy of DMF-based approaches in different pathological contexts and strongly demonstrates that this molecule deserves more attention by the scientific community. Indeed, the majority of the summarized findings is drawn from preclinical studies and represents the starting point for future in depth research aimed at strengthening these evidences and transfer them from the bench to the clinic.</p>
</sec>
</body>
<back>
<sec id="s6">
<title>Author contributions </title>
<p>GB: Writing&#x2013;original draft, Writing&#x2013;review and editing. FM: Writing&#x2013;review and editing. SD: Writing&#x2013;review and editing. PT: Writing&#x2013;review and editing. LS: Writing&#x2013;review and editing. MA: Conceptualization, writing&#x2013;original draft, writing&#x2013;review and editing.</p>
</sec>
<sec id="s7">
<title>Funding </title>
<p>The authors declare that no financial support was received for the research, authorship, and/or publication of this article.</p>
</sec>
<sec sec-type="COI-statement" id="s8">
<title>Conflict of interest </title>
<p>The authors declare that the research was conducted in the absence of any commercial or financial relationships that could be construed as a potential conflict of interest.</p>
</sec>
<sec sec-type="disclaimer" id="s9">
<title>Publisher&#x2019;s note</title>
<p>All claims expressed in this article are solely those of the authors and do not necessarily represent those of their affiliated organizations, or those of the publisher, the editors and the reviewers. Any product that may be evaluated in this article, or claim that may be made by its manufacturer, is not guaranteed or endorsed by the publisher.</p>
</sec>
<sec id="s10">
<title>Supplementary material</title>
<p>The Supplementary Material for this article can be found online at: <ext-link ext-link-type="uri" xlink:href="https://www.frontiersin.org/articles/10.3389/fphar.2023.1264842/full#supplementary-material">https://www.frontiersin.org/articles/10.3389/fphar.2023.1264842/full&#x23;supplementary-material</ext-link>
</p>
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<supplementary-material xlink:href="Image1.PNG" id="SM2" mimetype="application/PNG" xmlns:xlink="http://www.w3.org/1999/xlink"/>
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