Yuejiao Ma, Weitao Zhang, Weihong Li, Xin Lu, Yaqiong Li, Xueya Han, Ping Wang, Haiyan Zhang
The functional tight junctions' integrity plays an important role in liver physiology. A variety of liver diseases have been associated with the perturbation of tight junctions. Herein, we showed that the lower expression of α5 integrin in hepatocytes in patients with liver cirrhosis is associated with matrix deposition in the space of Disse. Selective silencing of α5 integrin in hepatocytes compromised the ultrastructure of tight junctions by downregulating claudin 1 in an SRC (proto-oncogene, non-receptor tyrosine kinase) signaling-dependent manner. α5 integrin signaling induced SRC-TET-mediated changes in 5-hydroxymethylcytosine and 5-methylcytosine levels in hepatocytes and . hMeDIP sequencing showed intergenic hypohydroxymethylation of the gene in hepatocytes after α5 integrin silencing in mice. Therefore, understanding the mechanisms regulating hepatic tight junction integrity in which α5 integrin-SRC signaling and epigenetic modifications cooperate might help advance the development of useful diagnostics and therapeutic approaches for liver disease.
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