Differential requirement of SWI/SNF for androgen receptor activity.

The Journal of Biological Chemistry
Thomas W MarshallKaren E Knudsen

Abstract

The androgen receptor (AR) is a ligand-dependent transcription factor whose activity is required for prostate cancer proliferation. Because ablation of AR activity is a critical goal of prostate cancer therapy, much emphasis has been placed on understanding the accessory proteins that regulate AR function in the prostate. Several co-activators have been shown to be required for full AR activity, including histone acetyl-transferases and TRAP/mediator complexes. SWI/SNF comprises a family of large, multisubunit complexes present in the cell, which contain one of two core ATPases required for nucleosome re-positioning, BRG1 or hBRM. We investigated the specific requirement of the SWI/SNF core ATPases for AR function. Using cells deficient in both BRG1 and hBRM, we show that activation of one AR target promoter, prostate-specific antigen (PSA), requires SWI/SNF chromatin remodeling for activity. A second AR target promoter, probasin, maintained a low level of activation in the absence of SWI/SNF. AR stimulation on the probasin core promoter could be partially induced with BRG1, but hBRM strongly stimulated AR activity. The PSA promoter was only induced by the restoration of hBRM. In contrast, ligand-dependent activation of the est...Continue Reading

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