Cellular and Molecular Gastroenterology and Hepatology最新文献

{"title":"Dysfunction of ATP7B splicing variant caused by enhanced interaction with COMMD1 in Wilson Disease.","authors":"Donghu Zhou, Huaduan Zi, Xiaoxi Yang, Xiaojin Li, Yanmeng Li, Anjian Xu, Bei Zhang, Wei Zhang, Xiaojuan Ou, Jidong Jia, Jian Huang, Hong You","doi":"10.1016/j.jcmgh.2024.101418","DOIUrl":"https://doi.org/10.1016/j.jcmgh.2024.101418","url":null,"abstract":"<p><strong>Background & aims: </strong>The association between Wilson disease and various ATP7B mutations is well-established; however, the molecular mechanism underlying the functional consequence of these mutations, particularly the splicing mutations, remains unclear. This study focused on the ATP7B c.1543+1G>C variant, to reveal a universal pathogenic mechanism of the ATP7B mutants with altered N-terminus.</p><p><strong>Methods: </strong>The splicing assay and RNA pull-down were performed to explore the mechanism of the aberrant splicing. The ATP7B knockout HuH-7 cell line and Atp7b^-/- mice were created, and the functional consequence of the mutant ATP7B were evaluated in-vitro and in-vivo.</p><p><strong>Results: </strong>The c.1543+1G>C mutation resulted in the skipping of ATP7B exon 3, and the mutant ATP7B showed a loss of trans-Golgi network (TGN) localization and was degraded via the ubiquitin-proteasome pathway, facilitated by enhanced interactions with COMMD1. Elevated intercellular copper concentration and reduced survival rate were observed in HuH-7 cells expressing mutant ATP7B. Restoration of wild-type ATP7B in Atp7b^-/- mice resulted in a substantial improvement in phenotype, while mice treated with mutant ATP7B did not demonstrate equivalent benefits.</p><p><strong>Conclusions: </strong>Our research investigated the pathogenicity and mechanism of ATP7B c.1543+1G>C variant, with particular focus on its enhanced interaction with COMMD1 as a potential universal mechanism contributing to the dysfunction of various ATP7B variants. These findings provide a foundation for the development of innovative therapeutic strategies that target abnormal splicing events in a range of hereditary diseases, including Wilson disease.</p>","PeriodicalId":55974,"journal":{"name":"Cellular and Molecular Gastroenterology and Hepatology","volume":null,"pages":null},"PeriodicalIF":7.1,"publicationDate":"2024-10-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142402103","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Notch-Driven Cholangiocarcinogenesis Involves the Hippo Pathway Effector TAZ via METTL3-m6A-YTHDF1.","authors":"Wenbo Ma, Jinqiang Zhang, Weina Chen, Nianli Liu, Tong Wu","doi":"10.1016/j.jcmgh.2024.101417","DOIUrl":"https://doi.org/10.1016/j.jcmgh.2024.101417","url":null,"abstract":"<p><strong>Background and aims: </strong>Notch and TAZ are implicated in cholangiocarcinogenesis, but whether and how these oncogenic molecules interact remain unknown.</p><p><strong>Methods: </strong>The development of CCA was induced by hydrodynamic tail vein (HDTV) injection of oncogenes (NICD/AKT) to the FVB/NJ mice. CCA xenograft was developed by inoculation of human CCA cells into the livers of SCID mice. Tissues and cells were analyzed using qRT-PCR, Western blotting analyses, Immunohistochemistry, ChIP-qPCR and WST-1 cell proliferation Assay.</p><p><strong>Results: </strong>Our experimental findings show that TAZ is indispensable in NICD-driven cholangiocarcinogenesis. Notch activation induces the expression of METTL3 (Methyltransferase like-3) which catalyzes N6-methyladenosine (m6A) modification of TAZ mRNA and that this mechanism plays a central role in the crosstalk between Notch and TAZ in CCA cells. Mechanistically, Notch regulates the expression of METTL3 through the binding of NICD to its downstream transcription factor CSL in the promoter region of METTL3. METTL3 in turn mediates m6A modification of TAZ mRNA which is recognized by the m6A reader YTHDF1 to enhance TAZ protein translation. We observed that inhibition of Notch signaling decreased the protein levels of both MELLT3 and TAZ. Depletion of METTL3 by shRNAs or by the next generation GapmeR antisense oligonucleotides (ASOs) decreased the level of TAZ protein and inhibited the growth of human CCA cells in vitro and in mice.</p><p><strong>Conclusion: </strong>This study describes a novel Notch-METTL3-TAZ signaling cascade which is important in CCA development and progression. Our experimental results provide new insight into how the Notch pathway cooperates with TAZ signaling in CCA, and the findings may have important therapeutic implications.</p>","PeriodicalId":55974,"journal":{"name":"Cellular and Molecular Gastroenterology and Hepatology","volume":null,"pages":null},"PeriodicalIF":7.1,"publicationDate":"2024-10-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142383317","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Single-cell profiling of intrahepatic immune cells reveals an expansion of tissue-resident cytotoxic CD4⁺ T lymphocyte subset associated with pathogenesis of alcoholic-associated liver diseases.","authors":"Chao Gao, Shiguan Wang, Xiaoyu Xie, Pierluigi Ramadori, Xinying Li, Xiaoyu Liu, Xue Ding, Jinyuan Liang, Bowen Xu, Yawei Feng, Xueying Tan, Haoran Wang, Yan Zhang, Haiyan Zhang, Tingguo Zhang, Ping Mi, Shiyang Li, Cuijuan Zhang, Detian Yuan, Mathias Heikenwalder, Peng Zhang","doi":"10.1016/j.jcmgh.2024.101411","DOIUrl":"https://doi.org/10.1016/j.jcmgh.2024.101411","url":null,"abstract":"<p><strong>Background & aims: </strong>The immunological mechanisms underpinning the pathogenesis of alcoholic-associated liver disease (ALD) remain incompletely elucidated. This study aims to explore the transcriptomic profiles of hepatic immune cells in ALD compared to healthy individuals and those with metabolic dysfunction-associated steatotic liver disease (MASLD).</p><p><strong>Methods: </strong>We utilized single-cell RNA sequencing to analyze liver samples from healthy subjects, MASLD, and ALD patients, focusing on the immune cell landscapes within the liver. Key alterations in immune cell subsets were further validated using liver biopsy samples from additional patient cohorts.</p><p><strong>Results: </strong>We observed a significant accumulation of CD4+ T cells in ALD patients' livers, surpassing the prevalence of CD8+ T cells, in contrast to MASLD and healthy counterparts, while natural killer (NK) cells and γδT cells exhibited reduced intrahepatic infiltration. In-depth transcriptional and developmental trajectory analyses unveiled that a distinct CD4+ subset characterized by granzyme K (GZMK) expression, displaying a tissue-resident signature and terminal effector state, prominently enriched among CD4+ T cells infiltrating the livers of ALD patient. Subsequent examination of an independent ALD patient cohort corroborated the substantial enrichment of GZMK+CD4+ T lymphocytes, primarily within liver fibrotic zones, suggesting their potential involvement in disease progression. Additionally, we noted shifts in myeloid populations, with expanded APOE+ macrophage and FCGR3B+ monocyte subsets in ALD samples relative to MASLD and healthy tissues.</p><p><strong>Conclusions: </strong>In summary, this study unravels the intricate cellular diversity within hepatic immune cell populations, highlighting the pivotal immune pathogenic role of the GZMK+CD4+ T lymphocyte subset in ALD pathogenesis.</p>","PeriodicalId":55974,"journal":{"name":"Cellular and Molecular Gastroenterology and Hepatology","volume":null,"pages":null},"PeriodicalIF":7.1,"publicationDate":"2024-09-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142333076","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"The role of eosinophils in liver disease.","authors":"Linxi Xie, Hejiao Zhang, Long Xu","doi":"10.1016/j.jcmgh.2024.101413","DOIUrl":"https://doi.org/10.1016/j.jcmgh.2024.101413","url":null,"abstract":"<p><p>Previously, eosinophils were primarily regarded as effector toxic cells involved in allergic diseases and parasitic infections. Nevertheless, new research has shown that eosinophils are diverse and essential for immune regulation and tissue homeostasis. Their functional plasticity has been observed in patients with inflammatory diseases, cancer, infections, and other disorders. While eosinophils are infrequently observed within the liver during periods of homeostasis, they are recruited to the liver in various liver diseases, including liver parasitosis, acute liver injury, autoimmune liver disease, and hepatocellular carcinoma. Furthermore, eosinophils have demonstrated the capacity to promote liver regeneration. This article explores the multifaceted roles of eosinophils in liver diseases, aiming to provide insights that could lead to more effective clinical therapies for these conditions.</p>","PeriodicalId":55974,"journal":{"name":"Cellular and Molecular Gastroenterology and Hepatology","volume":null,"pages":null},"PeriodicalIF":7.1,"publicationDate":"2024-09-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142333077","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Androgen effects on alcohol-induced liver fibrosis are controlled by a Notch-dependent epigenetic switch.","authors":"Kruti Nataraj, Michael Schonfeld, Adriana Rodriguez, Madhulika Sharma, Steven Weinman, Irina Tikhanovich","doi":"10.1016/j.jcmgh.2024.101414","DOIUrl":"https://doi.org/10.1016/j.jcmgh.2024.101414","url":null,"abstract":"<p><strong>Background: </strong>Alcohol-associated liver disease (ALD) is a major cause of alcohol related mortality. Sex is an important variable, however, the mechanism behind sex differences is not yet established.</p><p><strong>Methods: </strong>Kdm5b flox/flox Kdm5c flox male mice were subjected to gonadectomy or sham surgery. Mice were fed a Western diet and 20% alcohol in the drinking water for 18 weeks. To induce knockout, mice received 2x10¹¹ genome copies of AAV8-CMV-Cre or AAV8-control. To test the role of Notch, mice were treated with 10mg/kg of Avagacestat for 4 weeks.</p><p><strong>Results: </strong>We found that Kdm5b/Kdm5c knockout promoted alcohol induced liver disease, while gonadectomy abolished this effect, suggesting that male sex hormones promote liver disease in the absence of KDM5 demethylases. In contrast, in the thioacetamide-induced fibrosis model, male sex hormones showed a protective effect regardless of genotype. In human liver disease samples, we found that androgen receptor expression positively correlated with fibrosis levels when KDM5B levels were low and negatively when KDM5B was high, suggesting that a KDM5B-dependent epigenetic state defines the AR role in liver fibrosis. Using isolated cells, we found that this difference was due to the differential effect of testosterone on hepatic stellate cell activation in the absence or presence of KDM5B/KDM5C. Moreover, this effect was mediated by KDM5-dependent suppression of Notch signaling. In KDM5-deficient mice, Notch3 and Jag1 gene expression was induced, facilitating testosterone-mediated induction of Notch signaling and stellate cell activation. Inhibiting Notch with Avagacestat greatly reduced liver fibrosis and abolished the effect of Kdm5b/Kdm5c loss.</p><p><strong>Conclusions: </strong>Male sex hormone signaling can promote or prevent alcohol-associated liver fibrosis depending on the KDM5-dependent epigenetic state.</p>","PeriodicalId":55974,"journal":{"name":"Cellular and Molecular Gastroenterology and Hepatology","volume":null,"pages":null},"PeriodicalIF":7.1,"publicationDate":"2024-09-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142333071","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Noncoding Vault RNA1-1 Impairs Intestinal Epithelial Renewal and Barrier Function by Interacting with CUG-binding Protein 1.","authors":"Shweta Sharma, Lan Xiao, Hee K Chung, Ting Chen, Caroline G Mallard, Bridgette Warner, Ting-Xi Yu, Min S Kwon, Songah Chae, Jean-Pierre Raufman, Rosemary Kozar, Jian-Ying Wang","doi":"10.1016/j.jcmgh.2024.101410","DOIUrl":"https://doi.org/10.1016/j.jcmgh.2024.101410","url":null,"abstract":"<p><strong>Background & aims: </strong>Small noncoding vault RNAs (vtRNAs) are involved in many cell processes important for health and disease, but their pathobiological functions in the intestinal epithelium are underexplored. Here, we investigated the role of human vtRNA1-1 in regulating intestinal epithelial renewal and barrier function.</p><p><strong>Methods: </strong>Studies were conducted in vtRNA1-1 transgenic (vtRNA1-1Tg) mice, primary enterocytes, and Caco-2 cells. Extracellular vesicles (EVs) were isolated from the serum of shock patients and septic mice. Intestinal organoids (enteroids) were prepared from vtRNA1-1Tg and littermate mice. Mucosal growth was measured by Ki67 immunostaining or BrdU incorporation, and gut permeability assessed using the FITC-dextran assay.</p><p><strong>Results: </strong>Intestinal tissues recovered from shock patients and septic mice evidenced mucosal injury and gut barrier dysfunction; vtRNA levels were elevated in EVs isolated from their sera. In mice, intestinal epithelial-specific transgenic expression of vtRNA1-1 inhibited mucosal growth, reduced Paneth cell numbers and intercellular junction (IJ) protein expression, and increased gut barrier vulnerability to lipopolysaccharide exposure. Conversely, in vitro silencing of vtRNA1-1 increased IJ protein levels and enhanced epithelial barrier function. Exposing enteroids to vtRNA1-1-rich EVs augmented paracellular permeability. Mechanistically, vtRNA1-1 interacted with CUG-binding protein 1 (CUGBP1) and increased CUGBP1 association with claudin-1 and occludin mRNAs, thereby inhibiting their expression.</p><p><strong>Conclusions: </strong>These findings indicate that elevated levels of vtRNA1-1 in EVs and mucosal tissues repress intestinal epithelial renewal and barrier function. Notably, this work reveals a novel role for dysregulation of the vtRNA1-1/CUGBP1 axis in the pathogenesis of gut mucosal disruption in critical illness.</p>","PeriodicalId":55974,"journal":{"name":"Cellular and Molecular Gastroenterology and Hepatology","volume":null,"pages":null},"PeriodicalIF":7.1,"publicationDate":"2024-09-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142333074","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Intrahepatic exhausted antiviral immunity in an immunocompetent mouse model of chronic hepatitis B.","authors":"Satoshi Shigeno, Takahiro Kodama, Kazuhiro Murai, Daisuke Motooka, Akihisa Fukushima, Akira Nishio, Hayato Hikita, Tomohide Tatsumi, Toru Okamoto, Tatsuya Kanto, Tetsuo Takehara","doi":"10.1016/j.jcmgh.2024.101412","DOIUrl":"https://doi.org/10.1016/j.jcmgh.2024.101412","url":null,"abstract":"<p><strong>Background & aims: </strong>Targeting exhausted immune systems would be a promising therapeutic strategy to achieve a functional cure for HBV infection in chronic hepatitis B (CHB) patients. However, animal models recapitulating the immunokinetics of CHB are very limited. We aimed to develop an immunocompetent mouse model of CHB for intrahepatic immune profiling.</p><p><strong>Methods: </strong>CHB mice were created by intrahepatic delivery of the Sleeping Beauty transposon vector tandemly expressing the hepatitis B virus (HBV) genome and fumarylacetoacetate hydrolase (FAH) cDNA into C57BL/6J congenic FAH knockout mice via hydrodynamic tail vein injection. We profiled the viral and intrahepatic immune kinetics in CHB mice with or without treatment with recombinant IFNα or the hepatotropic Toll-like receptor 7 agonist SA-5 using single-cell RNA-seq.</p><p><strong>Results: </strong>CHB mice exhibited sustained HBV viremia and persistent hepatitis. They showed intrahepatic expansion of exhausted CD8+ T (Tex) cells, the frequency of which was positively associated with viral load. Recruited macrophages increased in number but impaired inflammatory responses in the liver. The cytotoxicity of mature NK cells also increased in CHB mice. IFNα and SA-5 treatment both resulted in viral suppression with mild hepatic flares in CHB mice. While both treatments activated NK cells, SA-5 had the capacity to revitalize the impaired function of Tex cells and liver-recruited macrophages.</p><p><strong>Conclusion: </strong>Our novel CHB mouse model recapitulated the intrahepatic exhausted antiviral immunity in CHB patients, which might be able to be reinvigorated by a hepatotropic TLR7 agonist.</p>","PeriodicalId":55974,"journal":{"name":"Cellular and Molecular Gastroenterology and Hepatology","volume":null,"pages":null},"PeriodicalIF":7.1,"publicationDate":"2024-09-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142333072","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Rethinking Immune Check Point Inhibitors Use in Liver Transplantation: Implications and Resistance.","authors":"Vivian Ortiz, Emilien Loeuillard","doi":"10.1016/j.jcmgh.2024.101407","DOIUrl":"https://doi.org/10.1016/j.jcmgh.2024.101407","url":null,"abstract":"<p><p>Immune checkpoint inhibitors (ICI) have revolutionized cancer therapy including the two most common liver tumors, hepatocellular carcinoma and cholangiocarcinoma, but their use in the peri-transplantation period is controversial. ICI therapy aims to heighten cytotoxic T lymphocytes response against tumors. However, tumor recurrence is common owing to tumor immune response escape involving ablation of CTL response by interfering with antigen presentation, triggering CLT apoptosis and inducing epigenetic changes that promote ICI therapy resistance. ICI can also affect tissue resident memory T cell population, impact tolerance in the post-transplant period, and induce acute inflammation risking graft survival post-transplant. Their interaction with immunosuppression may be key in reducing tumor burden and may thus, require multimodal therapy to treat these tumors. This review summarizes ICI use in the liver transplantation period, their impact on tolerance and resistance, and new potential therapies for combination or sequential treatments for liver tumors.</p>","PeriodicalId":55974,"journal":{"name":"Cellular and Molecular Gastroenterology and Hepatology","volume":null,"pages":null},"PeriodicalIF":7.1,"publicationDate":"2024-09-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142333075","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"A Helpful Bug in the System: Gut Microbes and Their Positive Impact on Portal Pressure Modulation.","authors":"Moira B Hilscher","doi":"10.1016/j.jcmgh.2024.101399","DOIUrl":"https://doi.org/10.1016/j.jcmgh.2024.101399","url":null,"abstract":"","PeriodicalId":55974,"journal":{"name":"Cellular and Molecular Gastroenterology and Hepatology","volume":null,"pages":null},"PeriodicalIF":7.1,"publicationDate":"2024-09-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142333070","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Understanding Enterohepatic Bile Acid Pools and Their Impact on Intestinal Physiology.","authors":"Shogo Takahashi, Frank J Gonzalez","doi":"10.1016/j.jcmgh.2024.101400","DOIUrl":"https://doi.org/10.1016/j.jcmgh.2024.101400","url":null,"abstract":"","PeriodicalId":55974,"journal":{"name":"Cellular and Molecular Gastroenterology and Hepatology","volume":null,"pages":null},"PeriodicalIF":7.1,"publicationDate":"2024-09-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142333078","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}