Anterior prostate epithelial AR inactivation modifies estrogen receptor expression and increases estrogen sensitivity

Simanainen, Ulla, McNamara, Keely, Gao, Yan Ru, McPherson, Stephen, Desai, Reena, Jimenez, Mark, & Handelsman, David (2011) Anterior prostate epithelial AR inactivation modifies estrogen receptor expression and increases estrogen sensitivity. American Journal of Physiology: Endocrinology and Metabolism, 301(4), E727-E735.

View at publisher (open access)

Abstract

This article is free to read on the publisher's website

Androgens influence prostate growth and development, so androgen withdrawal can control progression of prostate diseases. Although estrogen treatment was originally used to induce androgen withdrawal, more recently direct estrogen effects on the prostate have been recognized, but the nature of androgen-estrogen interactions within the prostate remain poorly understood. To characterize androgen effects on estrogen sensitivity in the mouse prostate, we contrasted models of castration-induced androgen withdrawal in the prostate stromal and epithelial compartments with a prostate epithelial androgen receptor (AR) knockout (PEARKO) mouse model of selective epithelial AR inactivation. Castration markedly increased prostate epithelial estrogen receptor (ER)α immunoreactivity compared with very low ERα expression in intact males. Similarly, strong basal and luminal ERα expression was detected in PEARKO prostate of intact males, suggesting that epithelial AR activity regulated epithelial ERα expression. ERβ was strongly expressed in intact, castrated, and PEARKO prostate. However, strong clusters of epithelial ERβ positivity coincided with epithelial stratification in PEARKO prostate. In vivo estrogen sensitivity was increased in PEARKO males, with greater estradiol-induced prostate growth and epithelial proliferation leading to squamous metaplasia, featuring markedly increased epithelial proliferation, thickening, and keratinization compared with littermate controls. Our results suggest that ERα expression in the prostate epithelial cells is regulated by local, epithelia-specific, androgen-dependent mechanisms, and this imbalance in the AR- and ER-mediated signaling sensitizes the mature prostate to exogenous estrogens.

Impact and interest:

5 citations in Scopus
5 citations in Web of Science®
Search Google Scholar™

Citation counts are sourced monthly from Scopus and Web of Science® citation databases.

These databases contain citations from different subsets of available publications and different time periods and thus the citation count from each is usually different. Some works are not in either database and no count is displayed. Scopus includes citations from articles published in 1996 onwards, and Web of Science® generally from 1980 onwards.

Citations counts from the Google Scholar™ indexing service can be viewed at the linked Google Scholar™ search.

ID Code: 52358
Item Type: Journal Article
Refereed: Yes
Additional Information: Articles free to read on journal website after 12 months
Keywords: prostate epithelia, androgen receptor, androgen receptor gene targeting, Cre-LoxP technology, mouse model, estrogen sensitivity
DOI: 10.1152/ajpendo.00580.2010
ISSN: 0193-1849
Subjects: Australian and New Zealand Standard Research Classification > BIOLOGICAL SCIENCES (060000)
Australian and New Zealand Standard Research Classification > MEDICAL AND HEALTH SCIENCES (110000)
Divisions: Current > QUT Faculties and Divisions > Faculty of Health
Current > Institutes > Institute of Health and Biomedical Innovation
Deposited On: 19 Jul 2012 06:29
Last Modified: 16 Jul 2017 08:01

Export: EndNote | Dublin Core | BibTeX

Repository Staff Only: item control page