Repressive effects of resveratrol on androgen receptor transcriptional activity.

<h4>Background</h4>The chemopreventive effects of resveratrol (RSV) on prostate cancer have been well established; the androgen receptor (AR) plays pivotal roles in prostatic tumorigenesis. However, the exact underlying molecular mechanisms about the effects of RSV on AR have not been fu...

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Autores principales:	Wen-feng Shi, Melanie Leong, Ellen Cho, Joseph Farrell, Han-chun Chen, Jun Tian, Dianzheng Zhang
Formato:	article
Lenguaje:	EN
Publicado:	Public Library of Science (PLoS) 2009
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/05bca1c7635449a59580b4c50ec138cf
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spelling	oai:doaj.org-article:05bca1c7635449a59580b4c50ec138cf2021-11-25T06:19:48ZRepressive effects of resveratrol on androgen receptor transcriptional activity.1932-620310.1371/journal.pone.0007398https://doaj.org/article/05bca1c7635449a59580b4c50ec138cf2009-10-01T00:00:00Zhttps://www.ncbi.nlm.nih.gov/pmc/articles/pmid/19816598/pdf/?tool=EBIhttps://doaj.org/toc/1932-6203<h4>Background</h4>The chemopreventive effects of resveratrol (RSV) on prostate cancer have been well established; the androgen receptor (AR) plays pivotal roles in prostatic tumorigenesis. However, the exact underlying molecular mechanisms about the effects of RSV on AR have not been fully elucidated. A model system is needed to determine whether and how RSV represses AR transcriptional activity.<h4>Methodology</h4>The AR cDNA was first cloned into the retroviral vector pOZ-N and then integrated into the genome of AR-negative HeLa cells to generate the AR(+) cells. The constitutively expressed AR was characterized by monitoring hormone-stimulated nuclear translocation, DNA binding, and transcriptional activation, with the AR(-) cells serving as controls. AR(+) cells were treated with RSV, and both AR protein levels and AR transcriptional activity were measured simultaneously. Chromatin immunoprecipitation (ChIP) assays were used to detect the effects of RSV on the recruitment of AR to its cognate element (ARE).<h4>Results</h4>AR in the AR (+) stable cell line functions in a manner similar to that of endogenously expressed AR. Using this model system we clearly demonstrated that RSV represses AR transcriptional activity independently of any effects on AR protein levels. However, neither the hormone-mediated nucleus translocation nor the AR/ARE interaction was affected by RSV treatment.<h4>Conclusion</h4>We demonstrated unambiguously that RSV regulates AR target gene expression, at least in part, by repressing AR transcriptional activity. Repressive effects of RSV on AR activity result from mechanisms other than the affects of AR nuclear translocation or DNA binding.Wen-feng ShiMelanie LeongEllen ChoJoseph FarrellHan-chun ChenJun TianDianzheng ZhangPublic Library of Science (PLoS)articleMedicineRScienceQENPLoS ONE, Vol 4, Iss 10, p e7398 (2009)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q Wen-feng Shi Melanie Leong Ellen Cho Joseph Farrell Han-chun Chen Jun Tian Dianzheng Zhang Repressive effects of resveratrol on androgen receptor transcriptional activity.
description	<h4>Background</h4>The chemopreventive effects of resveratrol (RSV) on prostate cancer have been well established; the androgen receptor (AR) plays pivotal roles in prostatic tumorigenesis. However, the exact underlying molecular mechanisms about the effects of RSV on AR have not been fully elucidated. A model system is needed to determine whether and how RSV represses AR transcriptional activity.<h4>Methodology</h4>The AR cDNA was first cloned into the retroviral vector pOZ-N and then integrated into the genome of AR-negative HeLa cells to generate the AR(+) cells. The constitutively expressed AR was characterized by monitoring hormone-stimulated nuclear translocation, DNA binding, and transcriptional activation, with the AR(-) cells serving as controls. AR(+) cells were treated with RSV, and both AR protein levels and AR transcriptional activity were measured simultaneously. Chromatin immunoprecipitation (ChIP) assays were used to detect the effects of RSV on the recruitment of AR to its cognate element (ARE).<h4>Results</h4>AR in the AR (+) stable cell line functions in a manner similar to that of endogenously expressed AR. Using this model system we clearly demonstrated that RSV represses AR transcriptional activity independently of any effects on AR protein levels. However, neither the hormone-mediated nucleus translocation nor the AR/ARE interaction was affected by RSV treatment.<h4>Conclusion</h4>We demonstrated unambiguously that RSV regulates AR target gene expression, at least in part, by repressing AR transcriptional activity. Repressive effects of RSV on AR activity result from mechanisms other than the affects of AR nuclear translocation or DNA binding.
format	article
author	Wen-feng Shi Melanie Leong Ellen Cho Joseph Farrell Han-chun Chen Jun Tian Dianzheng Zhang
author_facet	Wen-feng Shi Melanie Leong Ellen Cho Joseph Farrell Han-chun Chen Jun Tian Dianzheng Zhang
author_sort	Wen-feng Shi
title	Repressive effects of resveratrol on androgen receptor transcriptional activity.
title_short	Repressive effects of resveratrol on androgen receptor transcriptional activity.
title_full	Repressive effects of resveratrol on androgen receptor transcriptional activity.
title_fullStr	Repressive effects of resveratrol on androgen receptor transcriptional activity.
title_full_unstemmed	Repressive effects of resveratrol on androgen receptor transcriptional activity.
title_sort	repressive effects of resveratrol on androgen receptor transcriptional activity.
publisher	Public Library of Science (PLoS)
publishDate	2009
url	https://doaj.org/article/05bca1c7635449a59580b4c50ec138cf
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Repressive effects of resveratrol on androgen receptor transcriptional activity.

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