Abstract
Neurodegenerative diseases are primarily characterized by the selective loss of neurons in the brain, leading to a significant and widespread global public health burden. Although numerous mechanisms underlying neurodegenerative diseases have been elucidated, effective therapeutic strategies are still being explored. Several drugs have been proposed to halt disease progression; however, they often come with severe side effects. Recently, polysaccharides have garnered considerable attention due to their antioxidant, anti-neuroinflammatory, anticholinesterase, and anti-amyloidogenic properties. The ocean contains a large number of animals, plants, algae and fungal species. Its rich sources and wide availability make the research on marine drugs become a hot topic. Recently, polysaccharides dominated by fucoidan and chitosan have been reported to inhibit the progression of neurodegenerative diseases in a variety of ways. In this review article, we provide a comprehensive summary of reported polysaccharides that intervene in neurodegenerative diseases with the aim of exploring their potential as therapeutic agents.
1 Introduction
Neurodegenerative diseases (NDDs) arise from the progressive loss of neurons or their myelin sheathing and involve a fundamental role of neuroinflammation in the pathophysiology, resulting in functional impairment over time (Heemels, 2016; Agnello and Ciaccio, 2022). The prevalence of NDDs is extensive and encompasses Alzheimer’s disease (AD), Parkinson’s disease (PD), Huntington’s disease (HD), multiple sclerosis (MS), amyotrophic lateral sclerosis (ALS), traumatic brain injury (TBI)and age-related macular degeneration (AMD). These disorders may have genetic, environmental, or multifactorial etiologies (Höglund and Salter, 2013; Temple, 2023). The alterations in markers of inflammation could initiate or exacerbate neuroinflammation and perpetuate the neurodegenerative process (Furman et al., 2019; Tansey et al., 2022). ND affects individuals across all age groups and imposes substantial economic burdens on patients and their families (Nichols et al., 2022; Nandi et al., 2022). To date, no effective cure has been identified for any neurodegenerative disease (Heemels, 2016; Agnello and Ciaccio, 2022). Currently, drug therapy dominates the treatment landscape for neurodegenerative diseases. However, challenges such as drug toxicity, high costs, limited availability of drugs, and the emergence of drug resistance persist. Therefore, there is a pressing need to develop novel therapeutic agents.
Marine species exhibit remarkable diversity. China has been at the forefront of utilizing marine resources for medicinal purposes (Fu et al., 2016). In recent years, significant emphasis has been placed on developing new drugs and products derived from marine sources within pharmaceutical research (Hu et al., 2011). Marine drugs encompass various categories including polysaccharides, peptides, terpenoids, steroids, tannins, flavonoids and other t compounds (Hu et al., 2011). Polysaccharides are widely distributed in nature. Marine polysaccharides are a kind of polysaccharides isolated and purified from Marine and lake organisms (Wang et al., 2012). Based on their sources, marine polysaccharides can be categorized into three types: animal polysaccharides, plant polysaccharides, and microbial polysaccharides (Wang et al., 2012). Polysaccharides exhibit various effects such as anti-aging properties, antioxidant activity, ulcer prevention abilities, virus inhibition capabilities,cancer-fighting potential, hypoglycemic effects,and regulation of body immunity (Wang et al., 2012; Yu et al., 2018; Zeng et al., 2019; Jiang et al., 2021; Zhou et al., 2022). This review provides a comprehensive summary of recent advancements in utilizing marine polysaccharides for the treatment of neurodegenerative diseases as shown in Figure 1.
FIGURE 1
2 Polysaccharides from animals
2.1 Chitosan
Chitosan, a biopolymer derived from chitin found in the exoskeleton of crustaceans such as shrimp and crabs (Ouyang et al., 2017; González-Chavarría et al., 2023), has gained significant attention across various fields due to its biocompatibility, biodegradability, and non-toxic nature (Ouyang et al., 2017; Thirupathi et al., 2022; Budai et al., 2023). Chitosan has been investigated for its potential role in the management and treatment of neurodegenerative diseases by scavenging free radicals and reducing oxidative stress (Ahlawat et al., 2020; Pramod Kumar and Harish Prashanth, 2020; Etxebeste-Mitxeltorena et al., 2024). Chitooligosaccharides attenuate Cu2+-induced cellular oxidative damage and cell apoptosis involving Nrf2 activation (Huang et al., 2015), Chitosan, contributed to the attenuation of oxidative damage and could be used as a nutritional agent for AD treatment. Additionally, both chitosan (CHT) and its quarternary derivative N-trimethyl chitosan chloride exhibited a concentration-dependent inhibiting activity on Aβ 40 fibrillogenesis mainly depending on the attractive electrostatic interactions between the positively charged moieties in chitosan and the negatively charged residues in Aβ40 (Liu et al., 2015). Several animal studies have suggested that chitosan has the potential to enhance cognitive function and memory, which could be beneficial for conditions such as AD (Amini and Abdolmaleki, 2022; Saleem et al., 2022; Yang et al., 2023b). Following a 10-day induction with rotenone (500 μM) in male adult flies, the administration of low molecular weight chitosan demonstrated improvements in drosophila dyskinesia, exploratory defects, and increased survival up to 16 days (Pramod Kumar and Harish Prashanth, 2020). Chronic inflammation is recognized as a contributing factor in NDDs (Yang et al., 2022). Chitosan has demonstrated anti-inflammatory effects that may help alleviate neuroinflammatory processes associated with these conditions (Yang et al., 2018; Mohebichamkhorami et al., 2023; Rajkumar et al., 2024). It could modulate inflammatory mediators in lipopolysaccharides (LPS)-stimulated BV2 microglia via the MAPK signaling pathway, which was negative to its molecular weight, with lower molecular weight showed higher activity (Pangestuti et al., 2011). Wang et al. administered chitosan to MPTP-induced Parkinson’s disease mouse models which resulted in reduced inflammation along with effective protection against dopamine neuron damage while improving motor symptoms (Wang et al., 2024).
The blood-brain barrier (BBB) is the block of the delivery of drugs. As a non-toxic, safe, and potential agent, chitosan has attracted attention for use in drug delivery systems. Efficient delivery of dopamine (DA) is crucial for Parkinson’s disease treatment but pure dopamine cannot penetrate BBB due to its hydrophilicity (De Virgilio et al., 2016). Ren et al. (2017) highlighted chitosan hydrogel as a promising carrier system for drug delivery since their synthesized injectable quaternized chitosan hydrogel exhibited no cytotoxicity while effectively enabling local release of DA along with anti-inflammatory drugs. Hassan et al. (2024) confirmed significant anti-Parkinson’s and antidepressant effects achieved through chitosan-coated-Tanshinone IIA-nanostructured lipid carriers compared to uncoated counterparts in rotenone-induced PD rat models. Yang et al. discovered that Res-loaded CS/TPP nanoparticles can effectively penetrate the blood-brain barrier and inhibit microglia activation, thereby regulating brain glucose homeostasis, oxidative stress, and neuroinflammation (Yang et al., 2023a). Insulin exhibits a potent therapeutic effect in the treatment of Alzheimer’s disease (AD), and intranasal delivery of insulin represents an effective treatment strategy. Notably, chitosan Transfersulin nanovesicles prepared through thin film hydration have been demonstrated to enhance the neuroprotective efficacy on the hippocampus of diabetic model rats by facilitating continuous intracellular drug uptake and mediating insulin transport to the brain. This study highlights their potential as a promising approach for AD therapy (Bedse et al., 2015; Nojoki et al., 2022). The neuroprotective potential of chitosan-based FTY720 nanoformulation for preventing Parkinson’s disease (PD) through pP2A-mediated epigenetic regulation was investigated by Sardoiwala et al. (2021). It facilitates the transport of therapeutic agents across the BBB, potentially enhancing the efficacy of drugs used in treating NDDs (Ren et al., 2017; Zhang L. et al., 2020; Omidian et al., 2024). While there is promising research on chitosan’s potential in addressing neurodegenerative diseases, much of the work is still in the preclinical or early clinical stages. More extensive human trials are required to fully understand its benefits, optimal dosages, and mechanisms of action. The application of this native polysaccharide is limited by its high molecular weight and highly viscous nature resulting in its low solubility in acid-free aqueous media.
2.2 Glycosaminoglycan
Glycosaminoglycans play a pivotal role in the regeneration of the mammalian CNS. Glycosaminoglycan, especially those coating the surface of endothelial cells and leukocytes, regulate some of the major events during the inflammation process by which exogenous sulfated structures downregulating inflammation processes (Morla, 2019). As the rate-limiting step in Aβ production, the β-site amyloid precursor protein cleaving enzyme 1 (BACE-1) has emerged as a key drug target of AD (Prati et al., 2018; Monteiro et al., 2023). Previous studies have reported that heparin, a glycosaminoglycan, exhibits significant inhibitory effects on BACE-1 activity. However, the high anticoagulant potential limits heparin’s suitability as a therapeutic biomolecule. Therefore, alternative sources with reduced anticoagulant properties have garnered more attention (Engelberg, 2004; Alavi Naini and Soussi-Yanicostas, 2018; Yang et al., 2021). Notably, chondroitin sulfate extracted from Placopecten magellanicus containing a high content of 6-sulphated N-acetyl glucosamine demonstrates potent inhibition against BACE-1 (IC50 = 4.8 μg/mL), suggesting a more favorable therapeutic profile (Mycroft-West et al., 2023). Additionally, a marine-derived glycosaminoglycan containing heparan sulphate from Portunus pelagicus, was identified to inhibit human BACE1. Importantly, the interactions between P. pelagicus glycosaminoglycan and BACE1 differ significantly from those observed with heparin (Mycroft-West et al., 2019). Further investigations are warranted to elucidate the underlying mechanisms. Besides, de Sousa et al., obtained a type of Glycosaminoglycans, dermatan sulfate from the ascidian Phallusia nigra and demonstrated its neuroprotective and antioxidant properties in rotenone induced Neuro-2A cells. The underlying mechanisms probably resulted from regulating the activity of the antioxidant enzymes superoxide dismutase and catalase, leading to the decreased levels of lipid peroxidation to protected cells from damage (de Sousa et al., 2020). Recently, Phallusia nigra dermatan sulfate (PnD2,6S) was also reported with neuritogenic and neuroprotective role. It had a better neuritogenic effect than chondroitin sulfate and dermatan sulfate at a lower concentration (0.05 μg/mL) in pesticide rotenone induced a neuro 2A murine neuroblastoma cell line, suggesting the sulfation pattern was important for neuritogenic activity (Medeiros et al., 2023).
3 Polysaccharides from algae
Generally, the chemical composition of polysaccharides from microalgae and macroalgae is very complex and in high variance depending on the algal source, harvesting time, cultivation method. Due to the huge biodiversity and wide application in foods and folk medicine, seaweeds are considered as an attractive source of bioactive compounds. Many bioactive compounds, partially purified polysaccharides have been tested for various therapeutic activities against various human diseases (Pradhan et al., 2020).
3.1 Fucoidan
Fucoidans, abundant in the brown seaweeds and other marine species, are a group of sulfated polysaccharides composed of fucose, other monosaccharides (mannose, galactose, glucose, xylose, etc.) and uronic acids, even acetyl groups and proteins (Luthuli et al., 2019). Despite its complex structure, repeated (1→3)-l-fucopyranose, or alternating and repeated (1→3)- and (1→4)-l-fucopyranose, are recognized as the structural backbone. C-2 and C-4 on fucosyl residues could be substituted with sulfate and/or acetate groups (Zahan et al., 2022). Fucoidans derived from different sources possess variations in structural characteristics, leading to a wide spectrum of biological effects. Wozniak et al. obtained five sulfated fucans from brown algae (Scytothamnus australis, Marginariella boryana, Papenfussiella lutea, Splachnidium rugosum and Undaria pinnatifida), four of which could prevent the accumulation of beta-amyloid and AD-like tau in Herpes simplex virus type 1 (HSV1)-infected Vero cells. HSV1 was reported to induces the formation of beta-amyloid, and abnormally phosphorylated tau (P-tau), inducing AD (Wozniak et al., 2015). heparan sulfate (HS) in cell surface mediated Tau spreading in Alzheimer’s disease. fucoidans were expected to compete with HS to bind tau, inhibiting tau spreading. Jin et al. determined the binding abilities of sixty fucoidans/glycans with tau using SPR and AlphaLISA. They found that sulfated galactofucan (SJ-I) and sulfated heteropolysaccharide (SJ-GX-3) inhibited tau-cell interaction and uptake in wild type mouse lung endothelial cell lines, displying strong binding abilities than heparin, suggesting that fucoidans might be potential for inhibiting tau spreading (Jin et al., 2023). Xing et al. displayed that fucoidan from Fucus vesiculosus (FvF) more significantly improved mitochondrial dysfunction, reduced dopaminergic neuron loss, and improved motor deficits than other isolated and purified three different fucoidan species with different chemical structures in an 1-methyl-4-phenyl-1,2,3,6-tetrahydropyridine (MPTP)-induced PD mouse model. Furthermore, the ATP5F1a protein was identified as the key target responsible for alleviating mitochondrial dysfunction (Xing et al., 2023). Yang et al. extracted fucoidans from Sargassum crassifolium by warm water, which all showed antioxidant activity dose-dependently in H₂O₂-induced cytotoxicity in rat pheochromocytoma PC-12 cells. Despite the diverse structure, they possessed high and similar neuronal protective properties (Yang et al., 2017). Huang et al. improved the technology of extracting fucoidan from Sargassum hemiphyllum via a compressional-puffing process. All extracts showed antioxidant activities and protected SH-SY5Y cells from 6-hydroxydopamine (6-OHDA)-induced apoptosis, among which, phosphorylation of Akt play a vital role against 6-OHDA-induced neurotoxicity (Huang et al., 2017).
Fucoidan could inhibit the release of cytochrome c from the mitochondria to cytosol and caspase dependent apoptosis in beta-amyloid 25-35 (Aβ25-35) and d-galactose induced PC12 cells. Notablely, Fucoidan could regulate the cholinergic system by improving activity of acetylcholine and choline acetyl transferase and attenuating activity of acetylcholine esterase in AD model mice induced by infusion of d-Gal. Furthermore, fucoidan improved antioxidant activity to reduce oxidative stress (Wei et al., 2017). In monocrotophos induced PC12 cells, fucoidan also showed inhibitory activity against cholinergic and monoamine-metabolized enzymes. In addition, fucoidan prevented changes in neurochemicals and latency time of locomotor, learning and memory induced by monocrotophos in Drosophila melanogaster (Subaraja et al., 2020). Adella Putri et al., verified that fucoidan possessed good binding affinity with acetylcholinesterase (AChE) with the binding free energy values at −7.4 kcal/mol via a molecular docking approach (Adella Putri et al., 2024). In a transgenic Caenorhabditis elegans (C. elegans) AD model, fucoidan alleviated Abeta induced paralyzed phenotype through promoting proteolysis. Leading to the reduce the production of reactive oxygen species (ROS) (Wang et al., 2018). Jhamandas et al. used whole-cell patch clamp recording fucoidan on A beta-induced whole-cell currents in acutely dissociated rat basal forebrain neurons and in primary neuronal cultures. The results showed that Fucoidan not only blocks the A beta (25–35) reduction of whole-cell currents in a dose-dependent manner, but also attenuated the downregulation of phosphorylated protein kinase C (Jhamandas et al., 2005). These results demonstrated the potential neuroprotective effects of fucoidan.
Enormous evidence suggest that mitochondria hold a central position in ageing-related neurodegenerative diseases, which regulates cell death, a key feature of neurodegeneration. Mitochondrial DNA mutations and oxidative stress both contribute to ageing. Moreover, an impressive number of disease-specific proteins interact with mitochondria. Thus, therapies targeting energy metabolism or free-radical generation hold great promise (Klemmensen et al., 2024; Zong et al., 2024). Fucoidan was reported to reserve mitochondrial function by regulating PGC-1α/NRF2 pathway in a rotenone-induced rat model (Zhang et al., 2018), and via regulating the AMPK-PGC-1α axis in MPP+ induced SH-SY5Y cells (Han et al., 2019). In a 6-hydroxydopamine (6-OHDA) rat model of PD, fucoidan also showed neuroprotective effects. It prevented NADPH oxidases-1 (Nox1)-sensitive oxidative stress and cell damage in both tyrosine hydroxylase (TH)-positive neurons and non-TH-positive neurons. Fucoidan also effectively inhibited nigral microglial activation (Zhang et al., 2014).
In addition, Fucoidan improved the TH protein levels in MPP+-induced MN9D cells and in substantia nigra and corpus striatum of MPTP treated mice. Notably, the increase is greater than the level of dopamine and DOPAC, verifying that the dopaminergic terminals are more sensitive than the dopaminergic cell bodies to MPTP toxicity (Luo et al., 2009; Meenakshi et al., 2016). Fucoidan can be purified into several fractions, various fractions of FPS differing in uronic acid and sulfate content showed variable activities. fucoidan fraction sulfated heterosaccharide possessed protective effect against MPP + or - H₂O₂ induced SH-SY5Y cells apoptosis by affecting the PI3K/Akt pathway (Wang et al., 2017; Liu et al., 2020). The high sulfate content of fucoidan may have contributed to its bioactivity. Fucoidan could intervene in many inflammation-related metabolic syndrome, mainly act on several inflammatory process, including modulating inflammation-related gene expression, blocking lymphocyte adhesion and invasion, inhibiting multiple enzymes, and inducing apoptosis (Apostolova et al., 2020; Jayawardena et al., 2022). Fucoidan suppressed tumor necrosis factor-alpha (TNF-alpha)- and interferon-gamma (IFN-gamma)-induced NO production and iNOS expression in C6 glioma cells. Additionally, the activation AP-1, IRF-1, JAK/STAT and p38 mitogen-activated protein kinase (MAPK) was inhibited and the level of scavenger receptor B1 (SR-B1) was improved, suggesting its potential roles for treating inflammatory-related neuronal injury in neurodegenerative disease (Do et al., 2010). Additionally, fucoidan downregulate intracellular ROS and subsequent proinflammatory cytokine release in LPS-activated microglia, NF-κB/MAPK/Akt pathway played an important role (Park et al., 2011; Cui et al., 2012). However, in another study by Murgas et al., fucoidan accelerated the NO production by microglia induced by β amyloid (Aβ) and activated JNK/NF-κB signal pathway (Murgas et al., 2012). The details can be found in the Table 1. Fucoidan is a seaweed polysaccharide with a promising application in the prevention and treatment of NDDs. However, due to its wide source and diverse extraction methods, its molecular weight, sulfate content and structure change, which will affect its pharmacological activity.
TABLE 1
| Polysaccharide | Source | Extraction | Characteristics | Disease | Models | Dose | Function | Ref. |
|---|---|---|---|---|---|---|---|---|
| λ-carrageenan | Pseudoalteromonas carrageenovora | Fermentated by Pseudoalteromonas carrageenovora (KCTC 22325) | Including 6.11% of 2.672 kD, 13.7% of 1.319 kD and 456 D, and 1.83% of 185 D | AD | Aβ-induced rats | 1% low- and high-MW fucoidan and λ-carrageenan were added into a high-fat diet; Dextrin (1%) as the. negative control; 42 days | Modulated the gut microbiota and their metagenome function | Zhang et al. (2022) |
| Sulphated Agaran | Gracilaria cornea | Protease digestion by papain (60°C, 6 h), followed precipitation with cetylpyridinium chloride | 21% yield, 26% sulphate content without antioxidant capacity | PD | 6-OHDA- induced rats | 15, 30 or 60 μg, int 14 days Rats received 0.9% saline unilateral intrastriatal injection as the control group | Reduced the oxidative/nitroactive stress | Souza et al. (2017) |
| (Cr-SPs) Polysaccharides | Chlamydomonas reinhardtii | Hot water extraction, 80% ethanol precipitation; Anion exchange column Q-Sepharose purification | 65% carbohydrates, 34% sulphate, 36% uronic acid, 4% protein | PD | Fibrillation of α-Syn mutants | 0.25–1.00 mg/mL | Delayed the conversion of native protein into β-sheet-rich structures | Panigrahi et al. (2019) |
| Porphyran | Pyropia haitanensis | Hot water extraction, 80% ethanol precipitation; Ascorbate and hydrogen peroxide degradation | 65.7% total sugar, 13.1% sulfate and 10.4%3,6-anhydro-galactose; with DPPH scavenging activity | AD | Aβ1-40 induced mice | 75 mg/kg-300 mg/kg, Aβ1-40 solution as the negative control; Donepezil as the positive control; 16 days | Balanced choline acetyltransferase and acetylcholinesterase | (Zhang et al., 2020a) |
| Dermatan sulfate | Ascidian Phallusia nigra | Acetone delipidation, papain for proteolytic digestion, cetylpyridinum chloride precipitation | MW: ∼30 KDa with a polydisperse band | PD | Rotenone induced Neuro-2A cells | 0.75–12 μM for 72 h 1.5 μM was the best level | Regulated the activity of the antioxidant enzymes | de Sousa et al. (2020) |
| Exopolysaccharide | Keissleriella sp. YS4108 | Cold ethanol precipitation; washed with ethanol, acetone proteins eliminated; DEAE-52 anion-exchange chromatography, Sephacryl S-400 column and Sepharose CL-6B column | Galactose, glucose, rhamnose, mannose and glucuronic acid was 50:8:1:1:0.4 | ND | H₂O₂-induced PC 12 cells | 100, 200 and 300 μg/mL for 24 h 300 μg/mL was the best level Vitamin E as the positive control | Antioxidant | Sun et al. (2005) |
| Chitosan | Shrimp source | Tharanathan and Harish Prashanth, 2007, Indian Patent no-231,588, procured from India Sea Foods, Cochin, India | ∼20 kDa, 70% Acetylation | PD | Drosophila melanogaster exposed to rotenone for 7 days | LMWC concentration 5 mg (LMWC1) and 10 mg (LMWC2) were chosen as the standardized concentration | Enhanced the activity levels of, ETC., enzymes and restored dopamine levels | Pramod Kumar and Harish Prashanth (2020) |
| Exoskeletons of crustaceans and the cell walls of fungi and insects | Provided by the Biochemical Engineering College of Beingjing Union University | AD | Aβ1–42-induced rat | 200, 400, 800,400 mg/kg; huperzine A as a positive control | Reduced cognitive decline | Jia et al. (2016) | ||
| TCI, Tokyo, Japan, C0831 | PD | MPTP-induced mice | 5 mg/mL/mouse | Reduced acetate levels and inflammation, promoted repair of the intestinal barrier and blood-brain barrier | Wang et al. (2024) | |||
| JAKWANG Co.,Ltd. (Ansung, South Korea) | 90% deacetylation | AD | IL-1b and Ab25–35 induced human astrocytoma cell line CCF-STTG1 | 10 μg/mL | Inhibits the production of pro-inflammatory cytokine | Kim et al. (2002) | ||
| H2O2/FeSO4-induced cell death in the NT2 neural cell line | 0.1,0.5 w/v | Suppressed Abeta formation | Khodagholi et al. (2010) | |||||
| Glycosaminoglycan | Placopecten magellanicus | Delipidated, proteolysis, captured using strong anion exchange purification using DEAE-anion exchange chromatography | Anticoagulant activity | AD | FRET-based BACE-1 activity assays | 4.8 μg/mL | Inhibited BACE-1 | Mycroft-West et al. (2023) |
| Portunus pelagicus | Proteolysis, fractionated by DEAE-Sephacel anion-exchange chromatography utilizing a stepwise sodium chloride gradient | electrophoretic mobility | AD | fluorescence resonance energy transfer inhibition assay | Inhibited BACE-1 | Mycroft-West et al. (2019) | ||
| ST polysaccharide | Sargassum thunbergii | Hot water extraction for 4 h, ethanol precipitation, then separation and purification by anion exchange chromatography | 19.70% fucose (Fuc), 14.81% sulfate, 87.98% total sugar, and 18.06% uronic acid, 135 kDa monosaccharides composition was 0.59:0.08:0.31:0.04:0.47:0.08:1.00 (Man:Rha:GlcA:Glc:Gal:Xyl:Fuc) | PD | 6-OHDA-induced SH-SY5Y cells | 0.05, 0.1, 0.5 mg/mL 0.5 mg/mL was the best level | Well neuroprotective activity | Jin et al. (2018) |
| Fucoidan | Fucus vesiculosus | Defatted in chloroform/methanol for 24 h, digested with papain at 60 °C for 24 h precipitated with cetylpyridinium chloride, then separated by a Q Sepharose Fast Flow anion-exchange column | 39.5% ± 1.4% sulfate content; Mw: 103.1 ± 2.8 kDa, The monosaccharide composition is mainly fucose, which accounts for more than 95% | PD | MPTP-induced PD mouse model | Neurons were administered FvF (10 μM) for 48 h. SH-SY5Y cells were administered FvF (5, 10 and 25 μM) for 48 h | Improved mitochondrial dysfunction; Targeted ATP5F1a | Xing et al. (2023) |
| Laminaria japonica | Hot water extraction | 48% total sugar, 28% fucose, and 29% sulfate, fucose: galactose at 1:0.24. The average molecular weight of fucoidan was ∼7 kDa | PD | Rotenone-induced rat model | 35, 70, and 140 mg/kg/d for 38 days Rasagiline as the positive control | Regulated PGC-1α/NRF2 pathway | Zhang et al. (2018) | |
| Fucus vesiculosus | Purchased from Sigma Aldrich (St. Louis, MO, USA; Cat# F5631; Batch No. SLBP3196V) | MW: 38.2 kDa; composition: fucose (44.1%), sulfate (26.3%), ash (31.1%), and a little aminoglucose | PD | MPP+ induced SH-SY5Y cells | SH-SY5Y cells were exposed to fucoidan (0, 1, 10, 50, and 100 μg/mL) for 24 h or to 50 μg/mL fucoidan for 6, 12, 24, or 48 h 50 μg/mL for 24 h was the best level | Regulated the AMPK-PGC-1α axis | Han et al. (2019) | |
| Laminaria japonica | Hot water extraction | 48% total sugar, 28% fucose, and 29% sulfate MW: 7,000 Da Fucose: galactose at 1:0.24 | PD | 6-OHDA induced rat model | 10 or 20 mg/kg, i.p., once daily for 2 or 3 weeks | Prevented oxidative stress and nigral microglial activation | Zhang et al. (2014) | |
| Turbinaria decurrens | Depigmention with acetone followed by hot water extraction | carbohydrate 59.62%, sulfate 26.52%, and Uronic acid 6.3%. MW: 234,000 Da | PD | MPTP treated mice | 25 mg/kg body weight for 7 days | Inhibited Aβ accumulation within microglia | Meenakshi et al. (2016) | |
| Laminaria japonica | Hot water extraction, degradation using ascorbate and hydrogen peroxide and purification by DEAE-Sepharose FF exchange chromatography | sulfated heteropolysaccharides; mainly made of fucose, uronic acid and sulfated groups | PD | MPP+ or - H₂O₂ induced SH-SY5Y cells | 100, 500, 800 μg/mL Modoparas as the positive drugs | Regulated the PI3K/Akt pathway | Wang et al. (2017), Liu et al. (2020) | |
| Sargassum crassifolium | Warm water extraction | 2.36% protein, 0.98% lipid, 33.98% ash, and 62.67% carbohydrate Antioxidant activities | PD | H₂O₂-induced PC12 cells | 0–2000 μg/mL for 24 h concentration-dependent | Antioxidant | Yang et al. (2017) | |
| Sargassum hemiphyllum | Warm water extraction | 53%–68% total sugar 5.66%–7.04% uronic acid contents | PD | 6-OHDA induced SH-SY5Y cells | 0–500 μg/mL for 24 h concentration-dependent | Anti-apoptosis | Huang et al. (2017) | |
| Undaria pinnatifidasporophylls | trypsin-enzymatic hydrolysis and alcohol grade precipitation | carbohydrates (68.37%), sulfates (21%) and uronic acid (10.89%), protein (0.85%). MW 10.4356 × 104 Da | AD | Aβ 25-35 and d-galactose induced PC12 cells and mice Monocrotophos induced PC12 cells and Drosophila melanogaster | 65.2–1,000 μg/mL for 48 h or 500 μg/mL fucoidan for 6, 12, 24, 48 or 72 h | Regulate the cholinergic system Antioxidant | Wei et al. (2017), Subaraja et al. (2020) | |
| brown seaweed | Kangyue Biotech (Xian, China) | AD | Aβ-induced transgenic Caenorhabditis elegans | 0–2,500 ng/mL | Promote proteolysis | Wang et al. (2018) | ||
| AD | Aβ25-35 induced rat basal forebrain neurons | 0.05–10 μM for 48 h | Upregulated PKC | Jhamandas et al. (2005) | ||||
| Undaria pinnatifida | Treatment by 1% (w/v) H2SO4 0.2 M HCl, 2% CaCl2 for 6 h in turn | AD | HSV1-infected Vero cells | 0–20 μg/mL | Prevented the accumulation of Aβ and AD-like tau | Wozniak et al. (2015) |
Overview of polysaccharides from marine applied in NDDs.
3.2 λ-carrageenan
Carrageenan, a sulphated linear polysaccharide extracted from red seaweeds, was composed of D-galactose residues linked in β-1,4 and α-1,3 galactose-galactose bond (Borsani et al., 2021). Carrageenans have been extensively investigated for various bioactivities such as immunomodulatory activity, antiviral, anticoagulant, antioxidant, and cholesterol-lowering effects (Pangestuti and Kim, 2014). Based on the special negative charge and gelling, it has been used as a viscosity enhancing agent for controlled drug release and prolonged retention and tissue regeneration (Li et al., 2014; Borsani et al., 2021). Low-molecular-weight λ-carrageenan showed improvement on the memory function of rats with an infusion of toxic amyloid-β(Aβ) mainly by increasing the BDNF content and the insulin signaling through enhancing the pSTAT3→pAkt→pGSK-3β pathway. Additionally, regardless of the MW, λ-carrageenan intake could improve gut microbiota to reduce secondary bile acid biosynthesis degradation of toxic compounds, which effects were similar to low-molecular-weight fucoidan, as showed in the increased the abundance of probiotic bacteria Lactobacillus and Akkermentia. Furthermore, low-molecular-weight fucoidan potentiated hippocampal insulin signaling, increased the expression of ciliary neurotrophic factor and improved glucose tolerance the most (Zhang et al., 2022). Amyloids, with their β-sheet-rich structure, contribute to diabetes and AD. Liposomal nanoformulated iota carrageenan was formulated to effectively disrupt insulin amyloids, which shared structural resemblances with amyloids. The well biocompatibility facilitates its application in prevention and cure of AD (Udayakumar et al., 2024). Limited by the solubility of λ-carrageenan, more studies have been conducted on its oligosaccharides.
3.3 Sargassum polysaccharides
Jin et al. extracted several heteropolysaccharides from Sargassum integerrimum, Sargassum maclurei, Sargassum naozhouense, Spiraea thunbergii, S. hemiphyllum and Sargassum fusiforme. The result showed that neuroprotective activities varied according to the structure of the polysaccharides. Although the fragments represented the principal difference between the active and non-active compounds and structures with superoxide-radical scavenging effect were identified, these structures were not associated with neuroprotective effects. Thus, the effect of neuroprotective activities is determined by multiple factors (Jin et al., 2014). Sargassum thunbergii, a common intertidal seaweed species, is commonly used as bait and a component of artificial Sargassum beds due to its wide ecological amplitude and high economic and ecological value. Subsequently, Jin et al., prepared two polysaccharides (ST-1 and ST-2) from S. thunbergii using anion exchange chromatography. And ST showed well neuroprotective activity. The structure of ST was analyzed by ESI-MS with collision-induced dissociation tandem mass spectrometry (ESI-CID-MS/MS), suggesting that glucuronomannan contained alternating 2-linked Man and 4-linked GlcA, while fucoglucuronan contained 4-linked glucuronan with branched Fuc at C-3. The structure-function relationship need to be further study (Jin et al., 2018).
3.4 Polysaccharide from Chlamydomonas reinhardtii
α-Synuclein (α-Syn) is an intrinsically disordered presynaptic protein, participates in the progress of PD in an aggregation manner. The sulfated polysaccharides from Chlamydomonas reinhardtii (Cr-SPs) were isolated and verified to effectively inhibit α-Syn fibrillation by binding with α-Syn and delaying the conversion of α-helical intermediate into β-sheet rich structures. Cr-SPs are also effective even if onset of α-Syn fibrillation has already started and they also have the ability to dissolve pre-formed fibrils (Choudhary et al., 2018). Fibrillation/aggregation of α-Syn mutants affect specific tertiary interactions essential for stability of the native state. Panigrahi et al., demonstrated Cr-SPs inhibiting effects on fibrillation of α-Syn mutants through efficiently delaying the conversion of native protein into β-sheet-rich structures (Panigrahi et al., 2019). Thus, the finds have substantial therapeutic implications towards PD treatment.
3.5 Porphyran
The sulphated polysaccharides drived from marine algae are heterogenic molecules with different biological activities. Polysaccharides from red algae Pyropia haitanensis, named porphyrin, has been reported as a good antioxidant to stimulate immune response in aging mice. Considering its high viscosity, Zhang et al., degraded the polysaccharide and obtained several samples with similar sulfate content to that of natural porphyrin. These composition ameliorated the learning and memory impairment induced by Aβ1-40 through increasing choline acetyltransferase (CHAT) activity and decreased acetylcholinesterase (AChE) activity in the cortical and hippocampal tissue, implying that porphyrin might be the potential agents to target aging-related neurodegenerative disease (Zhang Z. et al., 2020). In addition, Wang et al. reported that acetylated porphyran and phosphorylated porphyran, rather than porphyran, significantly antagonized 25 μmol/L 6-OHDA-induced cytotoxicity, but without effect on 75 μmol/L 6-OHDA induced cytotoxicity. However, none could improve mitochondrial transmembrane potential, suggesting their minor neuroprotective effects independent of mitochondria restoration (Wang et al., 2015). An antioxidant degraded porphyran, was regarded as a protective agent against neurotoxicity-induced amyloid β peptide (Aβ) of AD mice. Porphyran significantly ameliorated the learning and memory impairment, balanced ChAT activity and AChE activity in the cortical and hippocampal tissue induced by Aβ1-40 (Zhang Z. et al., 2020).
3.6 Other polysaccharides
Souza et al. isolated and obtained a sulphated polysaccharide (SA-Gc) from red marine alga Gracilaria cornea presenting a structural 3,6-anhydro-α-l-galactose component. SA-Gc was identified as a polysaccharide of the type agaran, displayed neuroprotective effects through reducing the oxidative/nitroactive stress and modulating the transcription of neuroprotective and inflammatory genes in rat model PD induced by 6-hydroxydopamine (6-OHDA) (Souza et al., 2017). Polysaccharides from Chlorella pyrenoidosa (CPS) showed neuroprotective effect in 1-methyl-4-phenyl-1,2,3,6-tetrahydropyridine (MPTP)-induced mouse model of pD. The polysaccharides improved motor activity and dopamine expressions, inhibited peripheral immunomodulatory responses in serum and gut. The neuroprotective mechanism might be related to its immunomodulatory action (Chen et al., 2014). Additionally, polysaccharide obtained from Spirulina platensis also played a neuroprotective role in MPTP-induced mice, which was likely related to their antioxidative properties (Zhang et al., 2015). Marine microorganisms are considered as efficient producers of biologically active compounds. Sun et al., isolated and authenticated an exopolysaccharide from a marine filamentous fungus-Keissleriella sp. YS4108. The polysaccharide was composed of galactose, glucose, rhamnose, mannose and glucuronic acid, with a mean molecular weight of 1.3 × 105 Da. It showed that the polysaccharide possesses pronounced protective effects against H2O2-induced cell toxicity through elevating the cell survival and antioxidant activity in a dose-dependent manner (Sun et al., 2005).
4 Conclusion and perspective
Polysaccharides, especially marine polysaccharides showed related to regulating the biological processes with anti-apoptosis, anti-inflammatory, antioxidant, anticancer and many other effects. The study of fucoidan and chitosan applied in the treatment of neurodegenerative disorders via inhibiting cell death, inflammation, oxidation and acetylcholinesterase enzymatic activity drew more attention of marine polysaccharides. Now, the reported polysaccharides are mainly from animal and algal sources. A large number of fungi derived polysaccharides need to be further investigated. In addition, Polysaccharides, a heterogeneous class of macromolecules, possess distinct properties depending on their sources and extraction, which determinates their monosaccharide composition and functional groups. The development of polysaccharides as drugs requires a more rigorous standard for extraction and identification, and the polysaccharides containing sulfuric acid groups seem to have better opening value. Furthermore, drug delivery systems, such as chitosan, further expand the application of polysaccharides.
Statements
Author contributions
LZ: Writing–original draft. YR: Writing–original draft, Supervision. SZ: Writing–original draft, Data curation. YG: Writing–review and editing. JZ: Data curation, Writing–original draft. YL: Writing–review and editing, Conceptualization.
Funding
The author(s) declare that financial support was received for the research, authorship, and/or publication of this article. This study was supported by grants from the National Natural Science Foundation of China (32200802) and Qingdao West Coast New District Science and Technology Project (2020-3-2).
Conflict of interest
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.
Generative AI statement
The author(s) declare that no Generative AI was used in the creation of this manuscript.
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Summary
Keywords
neurodegenerative diseases, polysaccharides, marine, fucoidan, chitosan
Citation
Zhu L, Ren Y, Zhang S, Guo Y, Zong J and Liu Y (2024) Marine-derived polysaccharides: the potential agents against neurodegenerative diseases. Front. Pharmacol. 15:1506789. doi: 10.3389/fphar.2024.1506789
Received
06 October 2024
Accepted
04 December 2024
Published
18 December 2024
Volume
15 - 2024
Edited by
Peipei Wang, Shanghai Ocean University, China
Reviewed by
Mariia I. Shanaida, Ternopil State Medical University, Ukraine
Updates
Copyright
© 2024 Zhu, Ren, Zhang, Guo, Zong and Liu.
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.
*Correspondence: Yingjuan Liu, liuyingjuan829@163.com
†These authors have contributed equally to this work
Disclaimer
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