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<journal-id journal-id-type="publisher-id">Front. Cell Dev. Biol.</journal-id>
<journal-title>Frontiers in Cell and Developmental Biology</journal-title>
<abbrev-journal-title abbrev-type="pubmed">Front. Cell Dev. Biol.</abbrev-journal-title>
<issn pub-type="epub">2296-634X</issn>
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<publisher-name>Frontiers Media S.A.</publisher-name>
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<article-id pub-id-type="publisher-id">1454495</article-id>
<article-id pub-id-type="doi">10.3389/fcell.2024.1454495</article-id>
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<subj-group subj-group-type="heading">
<subject>Cell and Developmental Biology</subject>
<subj-group>
<subject>Editorial</subject>
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<title-group>
<article-title>Editorial: Immune cell development and differentiation in liver diseases</article-title>
<alt-title alt-title-type="left-running-head">Wu 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/fcell.2024.1454495">10.3389/fcell.2024.1454495</ext-link>
</alt-title>
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<contrib-group>
<contrib contrib-type="author">
<name>
<surname>Wu</surname>
<given-names>Xiaojing</given-names>
</name>
<xref ref-type="aff" rid="aff1">
<sup>1</sup>
</xref>
<xref ref-type="aff" rid="aff2">
<sup>2</sup>
</xref>
<xref ref-type="aff" rid="aff3">
<sup>3</sup>
</xref>
<uri xlink:href="https://loop.frontiersin.org/people/1960947/overview"/>
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<contrib contrib-type="author">
<name>
<surname>Chatzigeorgiou</surname>
<given-names>Antonios</given-names>
</name>
<xref ref-type="aff" rid="aff4">
<sup>4</sup>
</xref>
<uri xlink:href="https://loop.frontiersin.org/people/965854/overview"/>
<role content-type="https://credit.niso.org/contributor-roles/conceptualization/"/>
<role content-type="https://credit.niso.org/contributor-roles/project-administration/"/>
<role content-type="https://credit.niso.org/contributor-roles/Writing - review &#x26; editing/"/>
</contrib>
<contrib contrib-type="author" corresp="yes">
<name>
<surname>Shi</surname>
<given-names>Ying</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/1389101/overview"/>
<role content-type="https://credit.niso.org/contributor-roles/conceptualization/"/>
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<role content-type="https://credit.niso.org/contributor-roles/Writing - review &#x26; editing/"/>
</contrib>
<contrib contrib-type="author" corresp="yes">
<name>
<surname>Zhu</surname>
<given-names>Liuluan</given-names>
</name>
<xref ref-type="aff" rid="aff2">
<sup>2</sup>
</xref>
<xref ref-type="aff" rid="aff3">
<sup>3</sup>
</xref>
<xref ref-type="corresp" rid="c001">&#x2a;</xref>
<uri xlink:href="https://loop.frontiersin.org/people/1524790/overview"/>
<role content-type="https://credit.niso.org/contributor-roles/conceptualization/"/>
<role content-type="https://credit.niso.org/contributor-roles/project-administration/"/>
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<role content-type="https://credit.niso.org/contributor-roles/Writing - review &#x26; editing/"/>
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<aff id="aff1">
<sup>1</sup>
<institution>Department of Hepatology</institution>, <institution>The First Hospital of Jilin University</institution>, <addr-line>Changchun</addr-line>, <country>China</country>
</aff>
<aff id="aff2">
<sup>2</sup>
<institution>Beijing Key Laboratory of Emerging Infectious Diseases</institution>, <institution>Institute of Infectious Diseases</institution>, <institution>Beijing Ditan Hospital</institution>, <institution>Capital Medical University</institution>, <addr-line>Beijing</addr-line>, <country>China</country>
</aff>
<aff id="aff3">
<sup>3</sup>
<institution>Beijing Institute of Infectious Diseases</institution>, <addr-line>Beijing</addr-line>, <country>China</country>
</aff>
<aff id="aff4">
<sup>4</sup>
<institution>Department of Physiology</institution>, <institution>Medical School</institution>, <institution>National and Kapodistrian University of Athens</institution>, <addr-line>Athens</addr-line>, <country>Greece</country>
</aff>
<author-notes>
<fn fn-type="edited-by">
<p>
<bold>Edited and reviewed by:</bold> <ext-link ext-link-type="uri" xlink:href="https://loop.frontiersin.org/people/312230/overview">Ramani Ramchandran</ext-link>, Medical College of Wisconsin, United States</p>
</fn>
<corresp id="c001">&#x2a;Correspondence: Ying Shi, <email>shiy707@jlu.edu.cn</email>; Liuluan Zhu, <email>zhuliuluan@ccmu.edu.cn</email>
</corresp>
</author-notes>
<pub-date pub-type="epub">
<day>21</day>
<month>08</month>
<year>2024</year>
</pub-date>
<pub-date pub-type="collection">
<year>2024</year>
</pub-date>
<volume>12</volume>
<elocation-id>1454495</elocation-id>
<history>
<date date-type="received">
<day>25</day>
<month>06</month>
<year>2024</year>
</date>
<date date-type="accepted">
<day>24</day>
<month>07</month>
<year>2024</year>
</date>
</history>
<permissions>
<copyright-statement>Copyright &#xa9; 2024 Wu, Chatzigeorgiou, Shi and Zhu.</copyright-statement>
<copyright-year>2024</copyright-year>
<copyright-holder>Wu, Chatzigeorgiou, Shi and Zhu</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>
<related-article id="RA1" related-article-type="commentary-article" journal-id="Front. Cell Dev. Biol." xlink:href="https://www.frontiersin.org/researchtopic/54532" ext-link-type="uri">Editorial on the Research Topic <article-title>Immune cell development and differentiation in liver diseases</article-title>
</related-article>
<kwd-group>
<kwd>hepatitis</kwd>
<kwd>liver fibrosis</kwd>
<kwd>liver cancer</kwd>
<kwd>liver transplantation</kwd>
<kwd>immune cell</kwd>
<kwd>development and differentiation</kwd>
</kwd-group>
<custom-meta-wrap>
<custom-meta>
<meta-name>section-at-acceptance</meta-name>
<meta-value>Molecular and Cellular Pathology</meta-value>
</custom-meta>
</custom-meta-wrap>
</article-meta>
</front>
<body>
<sec id="s1">
<title>1 Introduction</title>
<p>Liver is a vital organ that acts as a reservoir for immune cells and is central to immune responses. The pathophysiological microenvironment of the liver provides an important site for the development and differentiation of immune cells such as T lymphocytes, natural killer (NK) cells and NKT cells, macrophages and dendritic cells (DCs). Macrophages are important immune cells in innate immunity, and have remarkable heterogeneity and polarization. Under pathological conditions, in addition to the resident macrophages, circulating monocytes are recruited to the diseased tissues, differentiate into macrophages and polarize to various phenotypes, mainly classically activated M1 and alternatively activated M2. Hepatitis is inflammatory condition of the liver caused by viruses, toxicants, alcohol or metabolic dysfunction. In various types of hepatitis, polarization of macrophages leads to a positive feedback loop of inflammation and tissue damage (<xref ref-type="bibr" rid="B5">Fern&#xe1;ndez-Regueras et al., 2023</xref>). T cell activation and differentiation are regulated in the presence of antigens in na&#xef;ve T cells, potentially leading to T cell dysfunction, including exhaustion or senescence, and effect-mediated immune deficiency, which is important for host defense. The senescence and exhaustion of T cells are key instigators of chronic inflammation. During the progression from hepatitis to hepatocellular carcinoma, the exhaustion of CD4<sup>&#x2b;</sup> and CD8<sup>&#x2b;</sup> T cells, along with an increased proportion of regulatory T cells (Tregs), promotes tumor cell growth (<xref ref-type="bibr" rid="B13">Wang et al., 2021</xref>). In line with DCs in other tissues, hepatic DCs can also be classified in two distinct categories: conventional DCs (cDCs) and plasmacytoid DCs (pDCs). CD1d-restricted NKT cells are classified into two main subsets: type I or invariant NKT cells and type II or diverse NKT cells. In the context of liver transplantation rejection, different subsets of DCs and NKT cells exhibit dual roles in promoting and inhibiting inflammatory responses (<ext-link ext-link-type="uri" xlink:href="https://doi.org/10.3389/fcell.2023.1277743">Du et al.</ext-link>; <ext-link ext-link-type="uri" xlink:href="https://doi.org/10.3389/fcell.2023.1274361">Zhao et al.</ext-link>). Despite the significant attention that the role of various immune cells in liver diseases has received in scientific literature, there is still uncertainty about the mechanisms that regulate the abnormal development and differentiation of these cells within the liver. The factors that influence the trajectory of immune cell development in the liver are not yet fully understood. This editorial aims to provide a comprehensive overview of the development and differentiation of immune cells in the context of liver diseases.</p>
<p>In this Research Topic, we have gathered four insightful papers that delve into the intricate relationship between immune cell development and various liver diseases. We extend our heartfelt thanks to the authors, reviewers, and our dedicated editorial team for their invaluable contributions to advancing our understanding of this critical field.</p>
</sec>
<sec id="s2">
<title>2 Development and differentiation of immune cells in hepatitis</title>
<p>While the use of vaccines and antiviral drugs has reduced the incidence of hepatitis, the rise in metabolic disorders has led to an increase in alcohol-related and non-alcoholic fatty liver diseases. In this Research Topic, Papadopoulos et al. elucidated how immune cells differentiate and develop in the context of these metabolic disorders, highlighting the role of abnormal oxidation in triggering inflammation and tissue damage. It also discusses the early stages of alcoholic liver disease, where similar processes of lipid degeneration and damage occur, and the subsequent activation of immune responses (<ext-link ext-link-type="uri" xlink:href="https://doi.org/10.3389/fcell.2024.1343806">Papadopoulos et al.</ext-link>).</p>
</sec>
<sec id="s3">
<title>3 Development and differentiation of immune cells in liver fibrosis and liver cancer</title>
<p>Liver fibrosis and cancer occur as a consequence of various liver diseases, during which significant alterations take place in the development and differentiation of immune cells. Throughout the course of alcoholic liver disease (ALD) progression, repeated episodes of inflammation resolution and tissue repair lead to an increased polarization of M2 macrophages (<ext-link ext-link-type="uri" xlink:href="https://doi.org/10.3389/fcell.2023.1292016">Sun et al.</ext-link>). Prolonged activation of M2 macrophages can induce pathological fibrosis due to their role in promoting tissue repair. Furthermore, M2 macrophages interact with hepatic stellate cells (HSCs) to establish a positive feedback loop that enhances collagen deposition (<xref ref-type="bibr" rid="B4">Cao et al., 2022</xref>). During the transition from liver disease to hepatocellular carcinoma (HCC), diverse phenotypic changes in immune cells collectively contribute to the formation of the tumor microenvironment. For instance, tumor-associated macrophages (TAMs) predominantly express an immunosuppressive M2 phenotype, which promotes tumor development, growth, dissemination, and stimulates neovascularization (<xref ref-type="bibr" rid="B3">Cao et al., 2024</xref>). Additionally, various T cell subsets such as CD4<sup>&#x2b;</sup> and CD8<sup>&#x2b;</sup> T cells are depleted in HCC leading to weakened immune surveillance function and insufficient anti-tumor immune response (<xref ref-type="bibr" rid="B2">Blank et al., 2019</xref>). Regulatory T cells exacerbate this process (<xref ref-type="bibr" rid="B13">Wang et al., 2021</xref>). Although there is some controversy surrounding it, innate killer T (iNKT) and mucin-associated invariant T (MAIT) cell subsets may have either promoting or inhibitory roles in HCC progression (<xref ref-type="bibr" rid="B11">Papanastasatou and Verykokakis, 2023</xref>).</p>
</sec>
<sec id="s4">
<title>4 Development and differentiation of immune cells in liver transplantation</title>
<p>Liver transplantation is the most effective approach for managing end-stage liver diseases. However, complications such as ischemia-reperfusion injury (IRI), rejection, tolerance, and graft infections are closely associated with immune cell differentiation and subpopulations. Two review articles in this edition provide a comprehensive overview of these subjects (<ext-link ext-link-type="uri" xlink:href="https://doi.org/10.3389/fcell.2023.1274361">Zhao et al.</ext-link>; <ext-link ext-link-type="uri" xlink:href="https://doi.org/10.3389/fcell.2023.1277743">Du et al.</ext-link>). Liver dendritic cells are less mature than those in peripheral tissues, with lower levels of MHC-II and other molecules that typically activate T cells. They contribute to immune tolerance by producing anti-inflammatory factors like prostaglandin E2, IL-10, and indoleamine 2,3-dioxygenase (IDO), which help to suppress the immune response to a transplant (<xref ref-type="bibr" rid="B9">Ness et al., 2021</xref>; <ext-link ext-link-type="uri" xlink:href="https://doi.org/10.3389/fcell.2023.1277743">Du et al.</ext-link>). NKT cells have a dual role post-transplant. While some activated NKT cells can trigger liver cell death and promote rejection, others help to regulate the immune response and foster tolerance, potentially enhancing the survival of the transplanted liver. The balance between these NKT cell subsets and their inflammatory or regulatory functions is crucial for the success of liver transplantation (<xref ref-type="bibr" rid="B7">Jukes et al., 2012</xref>; <xref ref-type="bibr" rid="B6">Jukes et al., 2007</xref>).</p>
</sec>
<sec id="s5">
<title>5 Therapeutic strategies and prospects for immune cell development and differentiation in liver diseases</title>
<p>As previously discussed, the development and differentiation of immune cells play a crucial role in the progression and inhibition of various types of liver diseases. Numerous immunotherapies have emerged, with the central aim being the restoration and maintenance of immune balance. For instance, mediators and drugs that modulate macrophage activation and polarization, such as berberine, aspirin, and metformin, have been shown to attenuate M1 polarization and reduce excessive liver tissue damage during hepatitis (<xref ref-type="bibr" rid="B8">Li et al., 2019</xref>; <xref ref-type="bibr" rid="B10">Oh et al., 2019</xref>; <xref ref-type="bibr" rid="B12">Patel et al., 2021</xref>). Similarly, in liver transplantation, adoptive transfer of regulatory immune cells, such as tolerogenic dendritic cells (Tol-DC), can promote donor-specific tolerance and reduce the need for immunosuppressants (<xref ref-type="bibr" rid="B14">Willekens et al., 2021</xref>). Conversely, in hepatocellular carcinoma, immune checkpoint inhibitors (ICIs) are utilized to counteract tumor-induced immunosuppression, thereby activating CD4<sup>&#x2b;</sup> and CD8<sup>&#x2b;</sup> cells to target and destroy tumor cells (<xref ref-type="bibr" rid="B1">Agdashian et al., 2019</xref>).</p>
</sec>
<sec id="s6">
<title>6 Summary</title>
<p>We are honored to present this Research Topic of research, which provides a thorough analysis of how immune cells develop and differentiate in different liver diseases and the therapeutic opportunities this presents. Covering a range of prevalent liver diseases, these articles shed light on the underlying mechanisms and explore the potential of immunotherapy as a treatment approach.</p>
</sec>
</body>
<back>
<sec id="s7">
<title>Author contributions</title>
<p>XW: Writing&#x2013;original draft. AC: Conceptualization, Project administration, Writing&#x2013;review and editing. YS: Conceptualization, Project administration, Supervision, Writing&#x2013;review and editing. LZ: Conceptualization, Project administration, Supervision, Writing&#x2013;review and editing.</p>
</sec>
<sec sec-type="funding-information" id="s8">
<title>Funding</title>
<p>The author(s) declare financial support was received for the research, authorship, and/or publication of this article. This work was funded by the National Natural Science Foundation of China (No. 82372189) and the Beijing High-Level Public Health Technical Talent Training Program (discipline backbone talent-02-32).</p>
</sec>
<sec sec-type="COI-statement" id="s9">
<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="s10">
<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>
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