Histone deacetylase 1 ( sirtuin 1, SIRT1) is an important member of deacetylase family, and plays an important role in the process of malignant tumor and embryonic development. In this article it was found that overexpression of SIRT1 could accelerate the DNA synthesis in human pancreatic beta cell CRL-1837 and inhibit cell senescence. SIRT1 also could bind to p53 as detected by co-immunoprecipitation and could change the phosphorylation level of p53.

Primary sclerosing cholangitis (PSC)is a chronic cholestatic liver disease characterized by inflammation, fibrosis,and stricture of the intra- and/ or extrahepatic bile ducts. PSC is frequently insidious onset,but may aggravate progressively and ultimately leading to biliary cirrhosis and eventually hepatic failure. Most of the PSC patients are associated with inflammatory bowel disease,and the risk of hepatobiliary malignancy especially cholangiocarcinoma increases significantly. So far,the mechanism of PSC is not clearly known and lacking effective medical therapy. This article provides a comprehensive review on advances in diagnosis and treatment of PSC,including the consensus on imaging diagnosis,prognostic stratification and new drugs in ongoing trials.