β-Catenin Signaling and Roles in Liver Homeostasis, Injury, and Tumorigenesis.

β-Catenin Signaling and Roles in Liver Homeostasis, Injury, and Tumorigenesis.
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DOI:
10.1053/j.gastro.2015.02.056
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发表时间:
2015-06
期刊:
影响因子:
29.4
通讯作者:
Monga SP
Monga SP
中科院分区:
医学1区
文献类型:
--
作者:
Monga SP

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β-catenin(由 CTNNB1 编码)是细胞表面钙粘蛋白复合物的一个亚基,在 WNT 信号通路中充当细胞内信号转导器;其活性的改变与肝细胞癌和其他肝脏疾病的发生有关。除了 WNT 之外,其他信号通路也可以汇聚于 β-catenin。 β-连环蛋白还与 T 细胞因子、叉头盒蛋白 O 和缺氧诱导因子 1α 等转录因子相互作用,调节靶基因的表达。我们讨论 β-连环蛋白在成人肝脏代谢分区中的作用。 β-连环蛋白还调节控制葡萄糖、营养物质和外源物质代谢的基因的表达;其活性的改变可能导致非酒精性脂肪性肝炎的发病机制。 β-连环蛋白信号传导的改变可能导致肝星状细胞的激活,这是纤维化所必需的。许多肝脏肿瘤,如肝细胞腺瘤、肝细胞癌和肝母细胞瘤,CTNNB1 发生突变,导致 β-catenin 持续激活,因此该分子可能成为治疗靶点。我们讨论了 β-连环蛋白活性的改变如何导致肝病,以及如何将其用于诊断和预后以及治疗方法的开发。
β -catenin (encoded by CTNNB1) is a subunit of the cell surface cadherin protein complex that acts as an intracellular signal transducer in the WNT signaling pathway; alterations in its activity have been associated with the development of hepatocellular carcinoma and other liver diseases. Other than WNT, additional signaling pathways also can converge at β-catenin. β-catenin also interacts with transcription factors such as T-cell factor, forkhead box protein O, and hypoxia inducible factor 1α to regulate the expression of target genes. We discuss the role of β-catenin in metabolic zonation of the adult liver. β-catenin also regulates the expression of genes that control metabolism of glucose, nutrients, and xenobiotics; alterations in its activity may contribute to the pathogenesis of nonalcoholic steatohepatitis. Alterations in β-catenin signaling may lead to activation of hepatic stellate cells, which is required for fibrosis. Many hepatic tumors such as hepatocellular adenomas, hepatocellular cancers, and hepatoblastomas have mutations in CTNNB1 that result in constitutive activation of β-catenin, so this molecule could be a therapeutic target. We discuss how alterations in β-catenin activity contribute to liver disease and how these might be used in diagnosis and prognosis, as well as in the development of therapeutics.
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