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首页> 外文期刊>Hepatology: Official Journal of the American Association for the Study of Liver Diseases >E2F1 is a novel fibrogenic gene that regulates cholestatic liver fibrosis through the Egr-1/SHP/EID1 network
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E2F1 is a novel fibrogenic gene that regulates cholestatic liver fibrosis through the Egr-1/SHP/EID1 network

机译:E2F1是一个新的纤维生成基因,可通过Egr-1 / SHP / EID1网络调节胆汁淤积性肝纤维化

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摘要

E2F transcription factor 1 (E2F1) is an important regulator of metabolic diseases; however, its role in liver function remains elusive. This study unraveled a regulatory cascade involving E2F1, early growth response-1 (Egr-1), nuclear receptor small heterodimer partner (SHP, NR0B2), and EIA-like inhibitor of differentiation 1 (EID1) in cholestatic liver fibrosis. Liver E2F1 messenger RNA (mRNA) and protein expression was strongly up-regulated in human nonalcoholic steatohepatitis (NASH) and alcohol cirrhosis; the latter was inversely correlated with diminished SHP expression. E2F1 was also highly induced by 3,5-diethoxycarbonyl-1, 4-dihydrocollidine (DDC) feeding and bile-duct ligation (BDL) in mice. E2F1-/- mice exhibited reduced biliary fibrosis by DDC as determined by Masson Trichrome and Picro Sirius red staining, and decreased serum bile acid (BA), BA pool size, and fecal BA excretion. In addition, cholestatic liver fibrosis induced by BDL, as determined by immunohistochemistry analysis of a1 collagen expression, was increased in SHP-/- mice but attenuated in hepatocyte SHP-overexpressed transgenic (STG) mice. Egr-1 exhibited marked induction in livers of SHP-/- mice compared to the wild-type mice in both sham and BDL groups, and reduction in STG livers. Egr-1 promoter was activated by E2F1, and the activation was abrogated by expression of SHP and its co-repressor EID1 in hepatoma cells Huh7, Hepa1, and stellate cells LX2. Chromatin immunoprecipitation assays further confirmed the association of E2F1, SHP, and EID1 proteins with the Egr-1 promoter, and their direct protein interactions were determined by glutathione S-transferase pull-down assays. Interestingly, E2F1 activated Egr-1 expression in a biphasic fashion as described in both human and mouse hepatocytes. Conclusion: E2F1 is a fibrogenic gene and could serve as a potential new diagnostic marker for nonalcoholic and alcoholic liver fibrosis/cirrhosis.
机译:E2F转录因子1(E2F1)是代谢疾病的重要调节剂;然而,它在肝功能中的作用仍然难以捉摸。这项研究揭示了胆汁淤积性肝纤维化中涉及E2F1,早期生长反应1(Egr-1),核受体小异二聚体伴侣(SHP,NR0B2)和EIA样分化抑制剂1(EID1)的调控级联。在人类非酒精性脂肪性肝炎(NASH)和酒精性肝硬化中,肝脏E2F1信使RNA(mRNA)和蛋白质表达被上调。后者与SHP表达减少呈负相关。小鼠中的3,5-二乙氧基羰基-1、4-二氢可力丁(DDC)喂养和胆管结扎(BDL)也高度诱导了E2F1。 E2F1-/-小鼠通过Masson Trichrome和Picro Sirius红染色确定通过DDC降低的胆汁纤维化,并降低血清胆汁酸(BA),BA池大小和粪便BA排泄。此外,由BDL诱导的胆汁淤积性肝纤维化,通过对a1胶原蛋白表达的免疫组织化学分析确定,在SHP-/-小鼠中增加,但在肝细胞SHP过表达的转基因(STG)小鼠中减弱。在深水和BDL组中,与野生型小鼠相比,Egr-1在SHP-/-小鼠的肝脏中均表现出明显的诱导作用,并且STG肝脏的含量降低。 Egr-1启动子被E2F1激活,并且在肝癌细胞Huh7,Hepa1和星状细胞LX2中SHP及其共阻遏物EID1的表达消除了激活。染色质免疫沉淀测定法进一步证实了E2F1,SHP和EID1蛋白与Egr-1启动子的关联,并且通过谷胱甘肽S-转移酶下拉测定法确定了它们的直接蛋白相互作用。有趣的是,E2F1以双相方式激活了Egr-1的表达,如人和小鼠肝细胞中所述。结论:E2F1是一个纤维化基因,可作为非酒精性和酒精性肝纤维化/肝硬化的潜在新诊断标志。

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