The Von Hippel-Lindau Protein Suppresses Androgen Receptor Activity

The androgen receptor (AR) plays a pivotal role in prostate homeostasis and prostate cancer development. To understand the mechanism underlying the regulation of the AR holds a promise for developing novel therapeutic approaches for prostate cancer. Here, we show that the Von Hippel-Lindau gene product, pVHL, physically interacts with AR and inhibits AR transcription activity but does not induce AR turnover. Moreover, pVHL also suppresses androgen-induced cell proliferation, implicating a physiological role of pVHL in androgen-induced signaling pathway. In addition, we provide evidence to show that pVHL actually enhanced AR de-ubiquitination instead of inducing AR ubiquitination, uncovering a noncanonical role of pVHL in the ubiquitin proteasome pathway. Our data reveal a novel function of pVHL in the regulation of AR transcription activity, which may expand the scope of pVHL in tumor suppression and provide mechanistic insight into prostate cancer initiation and progression.