Androgen sensitivity of prostate epithelium is enhanced by postnatal androgen receptor inactivation

Ulla Simanainen, Keely McNamara, Yan Ru Gao, David J. Handelsman

Research output: Contribution to journalArticlepeer-review

28 Citations (Scopus)

Abstract

Postnatal inactivation of epithelial androgen receptor (AR) in prostate epithelial AR knockout (PEARKO) mice results in hindered differentiation but enhanced proliferation of epithelial cells. As this resembles the precancerous proliferative atrophy of human prostates with undifferentiated but intensively replicating epithelial cells, we utilized the PEARKO mice to characterize the epithelial response to castration-induced involution with a focus on identifying the potential role of stromal AR and responsiveness of the androgen-deprived epithelia to the aromatizable androgen testosterone (T) or its nonaromatizable metabolite dihydrotestosterone (DHT). PEARKO and littermate control mice were orchidectomized at 8 wk of age and treated 2 wk later with subdermal implantation of 1-cm Silastic tubing filled with T or DHT for a week. Following castration, the prostatic involution and epithelial apoptosis did not significantly differ between control (intact AR) and PEARKO (only stromal AR) males, demonstrating that prostate epithelial involution following castration is mediated primarily via stromal ARdependent apoptotic signals. Androgen replacement (T/DHT) for 7 days induced significant growth and epithelial proliferation in all prostate lobes in both control and PEARKO, but full regrowth was observed only in controls treated with T. In PEARKO, prostate androgen (T and DHT) treatment induced significant epithelial cell "shedding" into the lumen, with T treatment resulting in acinar disorganization, cyst formation, and aberrant epithelial structures, described as a "gland within a gland." These data suggest that epithelial AR inactivation during postnatal prostate development sensitizes prostate epithelial cells to paracrine signaling mediated by stromal AR activity leading to indirectly androgen-induced epithelial hyperproliferation and formation of epithelial hyperplastic cysts by aromatizable androgens.

Original languageEnglish
Pages (from-to)E1335-E1343
JournalAmerican Journal of Physiology - Endocrinology and Metabolism
Volume296
Issue number6
DOIs
Publication statusPublished - 2009 Jun 1

Keywords

  • Cre-loxP technology
  • Gene targeting
  • Genetic mouse model

ASJC Scopus subject areas

  • Endocrinology, Diabetes and Metabolism
  • Physiology
  • Physiology (medical)

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