Histone deacetylase 3 (HDAC3) and other class I HDACs regulate colon cell maturation and p21 expression and are deregulated in human colon cancer.

The Journal of Biological Chemistry
Andrew J WilsonJohn M Mariadason

Abstract

Inhibitors of histone deacetylases (HDACs) induce growth arrest, differentiation, and apoptosis of colon cancer cell lines in vitro and have demonstrated anti-cancer efficacy in clinical trials. Whereas a role for HDAC1 and -2 in mediating components of the HDAC inhibitor response has been reported, the role of HDAC3 is unknown. Here we demonstrate increased protein expression of HDAC3 in human colon tumors and in duodenal adenomas from Apc1638(N/+) mice. HDAC3 was also maximally expressed in proliferating crypt cells in normal intestine. Silencing of HDAC3 expression in colon cancer cell lines resulted in growth inhibition, a decrease in cell survival, and increased apoptosis. Similar effects were observed for HDAC2 and, to a lesser extent, for HDAC1. HDAC3 silencing also selectively induced expression of alkaline phosphatase, a marker of colon cell maturation. Concurrent with its effect on cell growth, overexpression of HDAC3 and other Class I HDACs inhibited basal and butyrate-induced p21 transcription in a Sp1/Sp3-dependent manner, whereas silencing of HDAC3 stimulated p21 promoter activity and expression. However, the magnitude of the effects elicited by silencing of individual Class I HDACs was significantly less than tha...Continue Reading

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