Gut Barrier Permeability-α-Synuclein Axis Modulation
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From Analysis:
What are the mechanisms by which gut microbiome dysbiosis influences Parkinson's disease pathogenesis through the gut-brain axis?
Hypotheses from Same Analysis (8)
These hypotheses emerged from the same multi-agent debate that produced this hypothesis.
Description
Molecular Mechanism and Rationale
The gut-brain axis represents a critical bidirectional communication pathway that has emerged as a central player in neurodegenerative disease pathogenesis, particularly in α-synucleinopathies such as Parkinson's disease. The molecular foundation of this hypothesis centers on the compromised intestinal barrier integrity mediated by dysbiotic microbial communities and their direct impact on α-synuclein pathology propagation. The intestinal epithelial barrier is maintained by a complex network of tight junction proteins, including claudin-1 (CLDN1), occludin (OCLN), and zonula occludens-1 (ZO1), which form intercellular sealing complexes that regulate paracellular permeability.
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✓ Supporting Evidence 16
Polystyrene microplastic-induced oxidative stress triggers intestinal barrier dysfunction via the NF-κB/NLRP3/… MEDIUM▼
Emerging evidence has demonstrated the association between microplastics (MPs) with a diameter of <5 mm and the risk of intestinal diseases. However, the molecular mechanisms contributing to MP-induced intestinal barrier dysfunction have not been fully appreciated. In this study, C57BL/6 J mice were exposed to polystyrene microplastics (PS-MPs, 0.2, 1 or 5 μm) at 1 mg/kg body weight daily by oral gavage for 28 days. We found that PS-MPs exposure induced oxidative stress and inflammatory cell infiltration in mice colon, leading to an increased expression of pro-inflammatory cytokine. Moreover, there were an increase in intestinal permeability and decrease in mucus secretion, accompanied by downregulation of tight junction (TJ)-related zonula occluden-1 (ZO-1), occluding (OCLN) and claudin-1 (CLDN-1) in mice colon. Especially, 5 μm PS-MPs (PS5)-induced intestinal epithelial TJ barrier damage was more severe than 0.2 μm PS-MPs (PS0.2) and 1 μm PS-MPs (PS1). In vitro experiments indicated
Betulinic Acid Reduces Intestinal Inflammation and Enhances Intestinal Tight Junctions by Modulating the PPAR-… MEDIUM▼
Background: Intestinal epithelial barrier (IEB) dysfunction is related to multiple gastrointestinal disorders, notably inflammatory bowel disease (IBD). Betulinic acid (BA), a compound derived from birch bark, has demonstrated potential therapeutic benefits in IBD. Nevertheless, the impact of BA on IEB function has not been fully elucidated. Methods: The current study aimed to explore the potential underlying mechanisms of BA in dextran sodium sulfate (DSS)-induced IBD in mice and co-culture models involving Caco-2/HT29-MTX-E12 cell monolayers or mouse intestinal organoids (IOs) in conjunction with macrophages stimulated by lipopolysaccharide (LPS). Results: In vivo, BA treatment significantly improved body weight and colon length, alleviated disease activity index (DAI) scores, and reduced colonic histopathological injury in IBD mice. In vitro, BA reduced the flux of FITC-dextran; increased the TEER; and decreased the production of IL-6, IL-1β, and TNF-α while increasing IL-10 mRNA le
Sinapic Acid Alleviated Inflammation-Induced Intestinal Epithelial Barrier Dysfunction in Lipopolysaccharide- … MEDIUM▼
The integrity and permeability of the intestinal epithelial barrier are important indicators of intestinal health. Impaired intestinal epithelial barrier function and increased intestinal permeability are closely linked to the onset and progression of various intestinal diseases. Sinapic acid (SA) is a phenolic acid that has anti-inflammatory, antihyperglycemic, and antioxidant activities; meanwhile, it is also effective in the protection of inflammatory bowel disease (IBD), but the specific mechanisms remain unclear. Here, we evaluated the anti-inflammatory of SA and investigated its potential therapeutic activity in LPS-induced intestinal epithelial barrier and tight junction (TJ) protein dysfunction. SA improved cell viability; attenuated epithelial permeability; restored the protein and mRNA expression of claudin-1, ZO-1, and occludin; and reversed the redistribution of the ZO-1 and claudin-1 proteins in LPS-treated Caco-2 cells. Moreover, SA reduced the inflammatory response by do
Transcriptional dysregulation of skin barrier genes in atopic dermatitis and psoriasis: Mechanistic insights a… STRONG▼
Skin barrier dysfunction plays a pivotal role in the pathogenesis of inflammatory skin diseases such as atopic dermatitis and psoriasis. This review provides a comprehensive analysis of recent advances in the transcriptional and post-transcriptional regulation of key skin barrier-related genes, including FLG, LOR, CLDN1, AQP3 and IVL. We detail how intrinsic genetic variations and immune-mediated cytokine pathways-particularly the T helper 2 and T helper 17 axes-disrupt the epidermal defense system. Emerging therapeutic strategies targeting skin barrier restoration through natural compounds, biologic agents, and gene modulation technologies-such as small interfering RNA, antisense oligonucleotides, and histone deacetylase inhibitors-are critically reviewed. Moreover, the impact of the gut-skin axis and microbial metabolites on epidermal gene expression is discussed. Finally, we highlight the role of artificial intelligence and multi-omic integration in driving biomarker discovery and e
Lonicerae flos and turmeric extracts alleviate necrotic enteritis in broilers by modulating gut-liver health a… STRONG▼
BACKGROUND: Necrotic enteritis (NE) can cause intestinal barrier dysfunction in broilers, leading to secondary liver injury (SLI). In this process, the gut-liver axis plays a crucial role. Lonicerae flos and turmeric extracts (LTE), containing chlorogenic acid and curcumin, have been reported to possess anti-inflammatory, and antioxidant properties. Based on these potential biological benefits, this study aims to investigate the reparative effects of LTE on the intestinal barrier dysfunction in NE-infected broilers and assess its therapeutic efficacy in alleviating SLI. By elucidating the regulatory mechanisms of LTE on gut-liver axis health, this research provides new insights into the prevention and treatment of NE in broilers. RESULTS: LTE improved body weight and average daily gain while reducing intestinal lesion scores, coccidia oocysts, and Clostridium perfringens counts in NE broilers (P < 0.05). LTE enhanced intestinal morphology and up-regulated the expression of tight juncti
Gram-negative bacteria like Escherichia coli have an outer membrane that contains lipopolysaccharide (LPS), which is a powerful inducer of systemic inflammation. It is often associated with gut dysbiosis, intestinal barrier dysfunction, and liver damage. Despite increasing recognition of the gut-liver axis as a critical mediator in systemic inflammation and hepatic pathology, the efficacy of nutritional strategies targeting this pathway remains inadequately defined. This study evaluated the protective effects of zinc glycine (Zn_Gly), a highly bioavailable organic zinc chelate, against LPS-induced gut barrier disruption and liver damage in meat geese. Zn_Gly supplementation @ 80mg/kg of diet significantly attenuated LPS-induced impairments in growth performance, gut morphology, intestinal permeability and liver damage. Zn_Gly reduced considerably (p < 0.01) the levels of LPS in the both liver and ceca, and significantly increased (p<0.01) the expression of tight junction proteins (ZO-1
Fermented Soy Protein Maillard Product Prevents Bone Loss via TNF-α Suppression and Gut-Bone Axis Modulation i… STRONG▼
This study investigated the bone-protective effects of Maillard reaction products (MRPs) from isolated soy protein and their fermentation product (MRPF) using Lacticaseibacillus rhamnosus IM18. In lipopolysaccharide-induced RAW264.7 cells, MRP showed enhanced antioxidant and anti-inflammatory activities compared to isolated soy protein, which were further improved by MRPF. In ovariectomized mice and RANKL-stimulated RAW264.7 cells, MRPF demonstrated superior anti-osteoclastogenic and bone-protective effects by suppressing osteoclast differentiation and preventing bone resorption. These effects involved downregulation of pro-inflammatory cytokines (Tnfa, Il1b, Il6, and Tnfs11) and upregulation of osteoprotegerin (Tnfrsf11b), along with restoration of intestinal barrier genes (Ocln, Cldn1, and Tjp1). MRPF administration significantly modulated gut microbiota, reducing inflammation-associated taxa (Desulfovibrio) while enriching beneficial genera (Bifidobacterium, Ruminococcus, and Akkerm
Tight junctions (TJs) are essential for preserving cell polarity and controlling permeability. It has been disclosed that TJ proteins, especially specific claudins (CLDNs), are linked to inflammation and contribute to the emergence of diverse cancers, including brain malignancies. Aggressive gliomas, including glioblastoma multiforme (GBM), remain among the most common and deadly central nervous system (CNS) tumors worldwide, despite considerable advances in diagnostic and therapeutic approaches. These types of tumors are characterized by high rates of recurrence and metastasis, resulting in poor outcomes and prognosis. The pathophysiology of brain cancer is closely linked to CLDNs, as these specific proteins play critical roles in tumor cell proliferation, invasion, and disruption of the blood-brain barrier (BBB). Some studies reported the potential role of CLDNs in glioma progression and other neurological disorders. The purpose of this review is to highlight the significance of CLDN
Claudin-1 impairs blood-brain barrier by downregulating endothelial junctional proteins in traumatic brain inj… STRONG▼
Traumatic brain injury (TBI) is a leading cause of death and disability in patients. Brain microvasculature endothelial cells form the blood-brain barrier (BBB) which functions to maintain a protective barrier for the brain from the passive entry of systemic solutes. As a result of the cellular disruption caused by TBI, the BBB is compromised. Tight junction disruption in the endothelium of the BBB has been implicated in this response, but the underlying mechanisms remain unresolved. We utilized various in vivo models of severe to mild TBI as well as in vitro exposure of brain endothelial cells (bEND.3) to analyze conditions encountered following TBI to gain mechanistic insight into alterations observed at the BBB. We found that claudin-1 (CLDN1), was significantly increased in the brain endothelium both in vivo and in vitro. The observed increase of CLDN1 expression correlated with down-regulation of claudin-5 (CLDN5), occludin (OCLN), and zonula occludens (ZO-1), thereby altering BBB
BACKGROUND: Cancer patients experience gastrointestinal and behavioral symptoms, and are at increased risk of systemic infection and inflammation. These conditions are a major source of morbidity and decreased quality of life prior to cancer treatment, but poorly defined etiologies impede successful treatment. The gastrointestinal microbiota shape inflammation, influence cancer progression and treatment, and colonize tumors. However, research has not directly determined if peripheral tumors influence the microbiome and intestinal physiology, thus influencing gastrointestinal and behavioral symptoms. Therefore, the purpose of this study was to examine consequences of orthotopic, syngeneic mammary tumor implantation, growth, and resection on fecal bacteriome composition and intestinal barrier function in relation to systemic inflammation and enteric bacterial translocation in mice. METHODS: Female mice were randomized to 3 experimental groups: sham surgical control, tumor recipients, and
Effects of prebiotics on intestinal physiology, neuropsychological function, and exercise capacity of mice wit… STRONG▼
People suffered from insufficient or disrupted sleep due to night shifts, work pressure, and irregular lifestyles. Sleep deprivation caused by inadequate quantity or quality of sleep has been associated with not only increased risk of metabolic diseases, gut dysbiosis, and emotional disorders but also decreased work and exercise performance. In this study, we used the modified multiple platform method (MMPM) to induce pathological and psychological characteristics of sleep deprivation with C57BL/6J male mice, and investigated whether supplementing a prebiotics mixture of short-chain galactooligosaccharides (scGOS) and long-chain fructooligosaccharides (lcFOS) (9:1 ratio) could improve the impacts of sleep deprivation on intestinal physiology, neuropsychological function, inflammation, circadian rhythm, and exercise capacity. Results showed that sleep deprivation caused intestinal inflammation (increased TNFA and IL1B) and decreased intestinal permeability with a significant decrease in
BACKGROUND & AIMS: Anorexia nervosa is a severe eating disorder often leading to malnutrition and cachexia, but its pathophysiology is still poorly defined. Chronic food restriction during anorexia nervosa may induce gut barrier dysfunction, which may contribute to disease development and its complications. Here we have characterized intestinal barrier function in mice with activity-based anorexia (ABA), an animal model of anorexia nervosa. METHODS: Male C57Bl/6 ABA or limited food access (LFA) mice were placed respectively in cages with or without activity wheel. After 5 days of acclimatization, both ABA and LFA mice had progressively limited access to food from 6 h/d at day 6 to 3 h/d at day 9 and until the end of experiment at day 17. A group of pair-fed mice (PF) was also compared to ABA. RESULTS: On day 17, food intake was lower in ABA than LFA mice (2.0 ± 0.18 g vs. 3.0 ± 0.14 g, p < 0.001) and weight loss was more pronounced in ABA and PF compared to LFA mice (23.6 ± 1.6% and 24
The gut microbiota interacts with the host via neuroimmune, neuroendocrine and neural pathways. These pathways are components of the brain-gut-microbiota axis and preclinical evidence suggests that the microbiota can recruit this bidirectional communication system to modulate brain development, function and behaviour. The pathophysiology of depression involves neuroimmune-neuroendocrine dysregulation. However, the extent to which changes in gut microbiota composition and function mediate the dysregulation of these pathways is unknown. Thirty four patients with major depression and 33 matched healthy controls were recruited. Cytokines, CRP, Salivary Cortisol and plasma Lipopolysaccharide binding protein were determined by ELISA. Plasma tryptophan and kynurenine were determined by HPLC. Fecal samples were collected for 16s rRNA sequencing. A Fecal Microbiota transplantation was prepared from a sub group of depressed patients and controls and transferred by oral gavage to a microbiota-def
An accumulating body of evidence suggests that the bacterium Akkermansia muciniphila exhibits positive systemic effects on host health, mainly by improving immunological and metabolic functions, and it is therefore regarded as a promising potential probiotic. Recent clinical and preclinical studies have shown that A. muciniphila plays a vital role in a variety of neuropsychiatric disorders by influencing the host brain through the microbiota-gut-brain axis (MGBA). Numerous studies observed that A. muciniphila and its metabolic substances can effectively improve the symptoms of neuropsychiatric disorders by restoring the gut microbiota, reestablishing the integrity of the gut mucosal barrier, regulating host immunity, and modulating gut and neuroinflammation. However, A. muciniphila was also reported to participate in the development of neuropsychiatric disorders by aggravating inflammation and influencing mucus production. Therefore, the exact mechanism of action of A. muciniphila rema
Mounting evidence shows that the complex gut microbial ecosystem in the human gastrointestinal (GI) tract regulates the physiology of the central nervous system (CNS) via microbiota and the gut-brain (MGB) axis. The GI microbial ecosystem communicates with the brain through the neuroendocrine, immune, and autonomic nervous systems. Recent studies have bolstered the involvement of dysfunctional MGB axis signaling in the pathophysiology of several neurodegenerative, neurodevelopmental, and neuropsychiatric disorders (NPDs). Several investigations on the dynamic microbial system and genetic-environmental interactions with the gut microbiota (GM) have shown that changes in the composition, diversity and/or functions of gut microbes (termed "gut dysbiosis" (GD)) affect neuropsychiatric health by inducing alterations in the signaling pathways of the MGB axis. Interestingly, both preclinical and clinical evidence shows a positive correlation between GD and the pathogenesis and progression of
The microbiota-gut-brain axis (MGBA) is an intricate bidirectional communication network that links intestinal microbiota with the central nervous system (CNS) through immune, neural, endocrine, and metabolic pathways. Emerging evidence suggests that dysregulation of the MGBA plays pivotal roles in the onset and progression of neurodegenerative diseases. This review outlines the key molecular mechanisms by which gut microbes modulate neuroinflammation, blood-brain barrier integrity, protein misfolding, and neuronal homeostasis. We discuss how microbial metabolites, such as short-chain fatty acids, tryptophan derivatives, and bile acids, interact with host to influence CNS functions. Disease-specific features are described across Alzheimer's disease, Parkinson's disease, Multiple sclerosis, and Amyotrophic lateral sclerosis, emphasizing the distinct and overlapping pathways through which gut dysbiosis may contribute to pathogenesis. We further explore the translational potential of micr
✗ Opposing Evidence 9
Co-exposure to boscalid and TiO(2) (E171) or SiO(2) (E551) downregulates cell junction gene expression in smal… MEDIUM▼
A recent published study showed that TiO2 (E171) and SiO2 (E551), two widely used nano-enabled food additives, increased the translocation of the commonly used pesticide boscalid by 20% and 30% respectively. Such increased absorption of pesticides due to the presence of engineered nanomaterials (ENMs) in food raises health concerns for these food additives. In this companion study, mRNA expression of genes related to cell junctions in a small intestinal epithelial cellular model after exposure to simulated digestas of fasting food model (phosphate buffer) containing boscalid (150 ppm) with or without either TiO2 or SiO2 (1% w/w) were analyzed. Specific changes in cell barrier function underlying or contributing to the increased translocation of boscalid observed in the previous study were assessed. Results showed that exposure to boscalid alone has no significant effect on cell junction genes, however, co-exposure to boscalid and TiO2 significantly regulated expression of cell-matrix j
Co-exposure to boscalid and TiO(2) (E171) or SiO(2) (E551) downregulates cell junction gene expression in smal… MEDIUM▼
A recent published study showed that TiO2 (E171) and SiO2 (E551), two widely used nano-enabled food additives, increased the translocation of the commonly used pesticide boscalid by 20% and 30% respectively. Such increased absorption of pesticides due to the presence of engineered nanomaterials (ENMs) in food raises health concerns for these food additives. In this companion study, mRNA expression of genes related to cell junctions in a small intestinal epithelial cellular model after exposure to simulated digestas of fasting food model (phosphate buffer) containing boscalid (150 ppm) with or without either TiO2 or SiO2 (1% w/w) were analyzed. Specific changes in cell barrier function underlying or contributing to the increased translocation of boscalid observed in the previous study were assessed. Results showed that exposure to boscalid alone has no significant effect on cell junction genes, however, co-exposure to boscalid and TiO2 significantly regulated expression of cell-matrix j
Exposure to Progestin 17-OHPC Induces Gastrointestinal Dysfunction through Claudin-1 Suppression in Female Mic… MEDIUM▼
INTRODUCTION: Progestin, commonly used in oral contraception and preventing preterm birth, elicits various off-target side effects on brain and gastrointestinal (GI) functions, yet the precise mechanisms remain elusive. This study aims to probe progestin's impact on GI function and anxiety-like behaviors in female mice. METHODS: Colon stem cells were utilized to explore the mechanism underlying progestin 17-hydroxyprogesterone caproate (17-OHPC)-mediated suppression of claudin-1 (CLDN1), crucial for epithelial integrity. Chromatin immunoprecipitation and luciferase assays identified potential progestin-response elements on the CLDN1 promoter, with subsequent assessment of oxidative stress and pro-inflammatory cytokine release. Manipulation of vitamin D receptor (VDR) or estrogen receptor β (ERβ) expression elucidated their roles in 17-OHPC-mediated effects. Intestine-specific VDR deficient mice were generated to evaluate 17-OHPC's impact on GI dysfunction and anxiety-like behaviors in
Decrease in paracellular permeability and chemosensitivity to doxorubicin by claudin-1 in spheroid culture mod… MEDIUM▼
Chemotherapy resistance is a major problem in the treatment of cancer, but the underlying mechanisms are not fully understood. We found that the expression levels of claudin-1 (CLDN1) and 3, tight junctional proteins, are upregulated in cisplatin (CDDP)-resistant human lung adenocarcinoma A549 (A549R) cells. A549R cells showed cross-resistance to doxorubicin (DXR). Here, the expression mechanism and function of CLDN1 and 3 were examined. CLDN1 and 3 were mainly localized at tight junctions concomitant with zonula occludens (ZO)-1, a scaffolding protein, in A549 and A549R cells. The phosphorylation levels of Src, MEK, ERK, c-Fos, and Akt in A549R cells were higher than those in A549 cells. The expression levels of CLDN1 and 3 were decreased by LY-294002, a phosphoinositide 3-kinase (PI3K) inhibitor, and BAY 11-7082, an NF-κB inhibitor. The overexpression of CLDN1 and 3 decreased the paracellular permeability of DXR in A549 cells. Hypoxia levels in A549R and CLDN1-overexpressing cells (C
Acrolein suppresses anticancer drug-induced toxicity mediated by activating claudin-1 and Nrf2 axis in a spher… MEDIUM▼
Tobacco smoke contains various carcinogenic ingredients such as nicotine, acrolein, and benzopyrene; however, their effects on cancer treatment are not fully understood. Claudin-1 (CLDN1), a component of tight junctions, is involved in the increased resistance to anticancer drugs. In this study, we found that acrolein increases the mRNA and protein levels of CLDN1 in RERF-LC-AI cells derived from human lung squamous cell carcinoma (SCC). Acrolein increased the p-extracellular signal-regulated kinase (ERK) 1/2 levels without affecting the p-Akt level. The acrolein-induced elevation of CLDN1 expression was attenuated by U0126, a mitogen-activated protein kinase kinas (MEK) inhibitor. These results indicate that the activation of MEK/ERK pathway is involved in the acrolein-induced elevation of CLDN1 expression. In a spheroid model, acrolein suppressed the accumulation and toxicity of doxorubicin (DXR), which were rescued by CLDN1 silencing. The acrolein-induced effects were also observed
BACKGROUND & AIMS: Hepatitis C virus (HCV) infection is a challenge to prevent and treat because of the rapid development of drug resistance and escape. Viral entry is required for initiation, spread, and maintenance of infection, making it an attractive target for antiviral strategies. The tight junction protein claudin-1 (CLDN1) has been shown to be required for entry of HCV into the cell. METHODS: Using genetic immunization, we produced 6 monoclonal antibodies against the host entry factor CLDN1. The effects of antibodies on HCV infection were analyzed in human cell lines and primary human hepatocytes. RESULTS: Competition and binding studies demonstrated that antibodies interacted with conformational epitopes of the first extracellular loop of CLDN1; binding of these antibodies required the motif W(30)-GLW(51)-C(54)-C(64) and residues in the N-terminal third of CLDN1. The monoclonal antibodies against CLDN1 efficiently inhibited infection by HCV of all major genotypes as well as hi
Engineered Probiotics Enable Targeted Gut Delivery of Dual Gasotransmitters for Inflammatory Bowel Disease The… MEDIUM▼
Inflammatory bowel disease (IBD) remains an incurable condition, often accompanied by high rates of anxiety and depression, further diminishing the quality of life of patients. Endogenous gasotransmitters, such as carbon monoxide (CO) and hydrogen sulfide (H₂S), exhibit potent anti-inflammatory and immunomodulatory effects. However, their therapeutic application is limited by challenges in targeted delivery to affected tissues. Here, we propose a novel strategy for targeted gut delivery of CO/H2S through engineering Escherichia coli Nissle 1917 (EcN) with CO/H2S-releasing copolymer (POSR) loading. This engineered probiotic (POSR@EcN) enhances EcN colonization in the intestine and enables controlled, localized release of CO/H2S at inflamed sites. The release of CO/H2S modulates inflammation, restores intestinal barrier integrity, and reshapes gut microbiota by promoting beneficial bacteria and increasing short-chain fatty acids production, effectively alleviating IBD symptoms. Notably,
Ischemic stroke (IS) is a devastating disease with high disability and mortality rates worldwide. Despite advances in medical treatment, managing IS remains a significant challenge. In China, traditional Chinese herbal medicines (TCHMs) are often sought as alternative pharmacotherapies for both prevention and rehabilitation because of their proven efficacy and relatively low incidence of adverse reactions. While TCHMs do have certain limitations, their value cannot be overlooked. Centuries of clinical experience in China have established TCHMs as promising approaches for improving clinical outcomes and accelerating drug discovery in the treatment of IS. In this review, we summarize the potential mechanisms and clinical evidence of TCHMs in the treatment of IS in China. These findings suggest that TCHMs can treat IS through various pharmacological mechanisms, mainly anti-inflammatory, antiapoptotic, antioxidative stress, and mitochondrial regulatory mechanisms. Additionally, TCHMs provi
Lianweng formula restores intestinal barrier function in ulcerative colitis through the β-arrestin 1/NF-κB sig… MEDIUM▼
BACKGROUND: Ulcerative colitis (UC) is a chronic inflammatory disorder with a high incidence rate. UC has emerged as a significant global public health challenge mostly because of the limitations of current therapeutic strategies. The Lianweng formula (LWF) has exhibited promising efficacy in UC management; however, its precise mechanisms of action remain elusive, hindering its clinical translation and optimization. PURPOSE: This study aimed to evaluate the effectiveness of LWF in treating UC and elucidate the underlying mechanisms. METHODS: This study systematically evaluated the therapeutic effects of LWF on the UC rat model using a multidimensional approach. First, disease progression was assessed using disease activity index (DAI) scoring, histopathological analysis, and proinflammatory cytokine quantification. Second, the restorative effects of LWF on colonic barrier integrity were investigated through western blotting, RT-qPCR, and immunofluorescence staining. Third, proteomic pr
🧬 Theorist Proposes novel mechanisms and generates creative hypotheses ▼
Novel Therapeutic Hypotheses for Gut-Brain Axis in Parkinson's Disease
Hypothesis 1: Bacterial Curli Amyloid Mimicry Pathway
Title: Targeting Bacterial Curli Fibrils to Prevent α-Synuclein Cross-SeedingDescription: Gut bacteria produce curli amyloid fibrils that structurally mimic α-synuclein and act as nucleation seeds, promoting pathological α-synuclein aggregation through molecular mimicry. Therapeutic intervention with curli synthesis inhibitors (like Congo Red derivatives) could prevent this cross-kingdom amyloid seeding and halt early PD pathogenesis.
Target: CsgA (c
🔍 Skeptic Identifies weaknesses, alternative explanations, and methodological concerns ▼
Critical Evaluation of Gut-Brain Axis Hypotheses in Parkinson's Disease
Hypothesis 1: Bacterial Curli Amyloid Mimicry Pathway
Weaknesses in Evidence:
- Cross-seeding specificity: The supporting studies primarily used C. elegans models, which lack the complex human blood-brain barrier and immune system (PMID:26751493). Cross-kingdom amyloid interactions may not translate to mammalian systems.
- Causation vs. correlation: The presence of bacterial amyloids in PD patients doesn't establish causation - they could be a consequence rather than cause of gut dysbiosis.
- **Selectivi
🎯 Domain Expert Assesses practical feasibility, druggability, and clinical translation ▼
Practical Feasibility Assessment: Gut-Brain Axis PD Hypotheses
HYPOTHESIS 1: Bacterial Curli Amyloid Inhibition
Druggability: MODERATEChemical Matter & Tool Compounds:
- Congo Red derivatives: FN-1501 (developed by Funxional Therapeutics) - synthetic Congo Red analog with improved pharmacokinetics
- Curcumin analogs: EF24, Difluorinated curcumin (showed anti-amyloid activity in preclinical studies)
- Small molecule amyloid inhibitors: Epigallocatechin gallate (EGCG), Quercetin, Resveratrol
Existing Clinical Candidates:
- **None specifically targeting bacterial
⚖ Synthesizer Integrates perspectives and produces final ranked assessments ▼
Price History
| Event | Price | Change | Source | Time | |
|---|---|---|---|---|---|
| 📄 | New Evidence | $0.507 | ▲ 0.9% | evidence_batch_update | 2026-04-13 02:18 |
| 📄 | New Evidence | $0.502 | ▲ 3.0% | evidence_batch_update | 2026-04-13 02:18 |
| ⚖ | Recalibrated | $0.487 | ▼ 0.4% | 2026-04-12 10:15 | |
| ⚖ | Recalibrated | $0.489 | ▼ 2.0% | 2026-04-12 05:13 | |
| ⚖ | Recalibrated | $0.499 | ▼ 1.1% | 2026-04-10 15:58 | |
| ⚖ | Recalibrated | $0.505 | ▲ 1.3% | 2026-04-10 15:53 | |
| ⚖ | Recalibrated | $0.498 | ▼ 5.6% | 2026-04-08 18:39 | |
| ⚖ | Recalibrated | $0.528 | ▼ 11.9% | 2026-04-06 04:04 | |
| ⚖ | Recalibrated | $0.599 | ▼ 0.6% | 2026-04-04 16:38 | |
| ⚖ | Recalibrated | $0.602 | ▲ 0.3% | 2026-04-04 16:02 | |
| ⚖ | Recalibrated | $0.601 | ▲ 17.5% | 2026-04-03 23:46 | |
| ⚖ | Recalibrated | $0.511 | ▼ 19.2% | market_dynamics | 2026-04-03 01:06 |
| ⚖ | Recalibrated | $0.633 | ▲ 35.9% | 2026-04-02 21:55 | |
| ⚖ | Recalibrated | $0.466 | ▲ 5.7% | market_recalibrate | 2026-04-02 19:14 |
| 📄 | New Evidence | $0.441 | ▼ 15.9% | market_dynamics | 2026-04-02 17:18 |
Clinical Trials (5) Relevance: 44%
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📚 Cited Papers (50)
📓 Linked Notebooks (4)
Wiki Pages
KG Entities (82)
Dependency Graph (4 upstream, 4 downstream)
Linked Experiments (10)
Related Hypotheses
Estimated Development
🧪 Falsifiable Predictions (2)
Knowledge Subgraph (494 edges)
activates (3)
associated with (28)
causes (2)
co associated with (38)
component of (1)
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implicated in (11)
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regulates (1)
targets (13)
Mechanism Pathway for CLDN1, OCLN, ZO1, MLCK
Molecular pathway showing key causal relationships underlying this hypothesis
graph TD
h_6c83282d["h-6c83282d"] -->|targets| CLDN1__OCLN__ZO1__MLCK["CLDN1, OCLN, ZO1, MLCK"]
CLDN1__OCLN__ZO1__MLCK_1["CLDN1, OCLN, ZO1, MLCK"] -->|associated with| neurodegeneration["neurodegeneration"]
CLDN1__OCLN__ZO1__MLCK_2["CLDN1, OCLN, ZO1, MLCK"] -->|implicated in| neurodegeneration_3["neurodegeneration"]
CLDN1__OCLN__ZO1__MLCK_4["CLDN1, OCLN, ZO1, MLCK"] -->|co associated with| SNCA__HSPA1A__DNMT1["SNCA, HSPA1A, DNMT1"]
CLDN1__OCLN__ZO1__MLCK_5["CLDN1, OCLN, ZO1, MLCK"] -->|co associated with| TH__AADC["TH, AADC"]
CLDN1__OCLN__ZO1__MLCK_6["CLDN1, OCLN, ZO1, MLCK"] -->|co associated with| NLRP3__CASP1__IL1B__PYCAR["NLRP3, CASP1, IL1B, PYCARD"]
CLDN1__OCLN__ZO1__MLCK_7["CLDN1, OCLN, ZO1, MLCK"] -->|co associated with| GLP1R__BDNF["GLP1R, BDNF"]
AHR__IL10__TGFB1["AHR, IL10, TGFB1"] -->|co associated with| CLDN1__OCLN__ZO1__MLCK_8["CLDN1, OCLN, ZO1, MLCK"]
CLDN1__OCLN__ZO1__MLCK_9["CLDN1, OCLN, ZO1, MLCK"] -->|co associated with| TLR4__SNCA["TLR4, SNCA"]
style h_6c83282d fill:#4fc3f7,stroke:#333,color:#000
style CLDN1__OCLN__ZO1__MLCK fill:#ce93d8,stroke:#333,color:#000
style CLDN1__OCLN__ZO1__MLCK_1 fill:#ce93d8,stroke:#333,color:#000
style neurodegeneration fill:#ef5350,stroke:#333,color:#000
style CLDN1__OCLN__ZO1__MLCK_2 fill:#ce93d8,stroke:#333,color:#000
style neurodegeneration_3 fill:#ef5350,stroke:#333,color:#000
style CLDN1__OCLN__ZO1__MLCK_4 fill:#ce93d8,stroke:#333,color:#000
style SNCA__HSPA1A__DNMT1 fill:#ce93d8,stroke:#333,color:#000
style CLDN1__OCLN__ZO1__MLCK_5 fill:#ce93d8,stroke:#333,color:#000
style TH__AADC fill:#ce93d8,stroke:#333,color:#000
style CLDN1__OCLN__ZO1__MLCK_6 fill:#ce93d8,stroke:#333,color:#000
style NLRP3__CASP1__IL1B__PYCAR fill:#ce93d8,stroke:#333,color:#000
style CLDN1__OCLN__ZO1__MLCK_7 fill:#ce93d8,stroke:#333,color:#000
style GLP1R__BDNF fill:#ce93d8,stroke:#333,color:#000
style AHR__IL10__TGFB1 fill:#ce93d8,stroke:#333,color:#000
style CLDN1__OCLN__ZO1__MLCK_8 fill:#ce93d8,stroke:#333,color:#000
style CLDN1__OCLN__ZO1__MLCK_9 fill:#ce93d8,stroke:#333,color:#000
style TLR4__SNCA fill:#ce93d8,stroke:#333,color:#000
3D Protein Structure
🧬 CLDN1 — PDB 5OY6 Click to expand 3D viewer
Source Analysis
What are the mechanisms by which gut microbiome dysbiosis influences Parkinson's disease pathogenesis through the gut-brain axis?
neurodegeneration | 2026-04-01 | completed