Transcription Factors Involved in Prostate Gland Adaptation to Androgen Deprivation

Author(s)

Rosa-Ribeiro, Rafaela ^[1] ; Nishan, Umar ^[1] ; Vidal, Ramon Oliveira ^[2] ; Barbosa, Guilherme Oliveira ^[1] ; Reis, Leonardo Oliveira ^[3] ; Cesar, Carlos Lenz ^{[4, 5]} ; Carvalho, Hernandes F. ^{[1, 5]}

Affiliation

^[1] Univ Estadual Campinas, Dept Struct & Funct Biol, Sao Paulo - Brazil

^[2] Natl Ctr Res Energy & Mat, Lab Bioinformat, Sao Paulo - Brazil

^[3] Univ Estadual Campinas, Div Urol, Sao Paulo - Brazil

^[4] Univ Estadual Campinas, Dept Quantum Phys, Sao Paulo - Brazil

^[5] Univ Estadual Campinas, Natl Inst Photon Appl Cell Biol INFABiC, Sao Paulo - Brazil

• Document type: Journal article
• Source: PLoS One; v. 9, n. 6 JUN 2 2014.
• Web of Science Citations: 11

Abstract

Androgens regulate prostate physiology, and exert their effects through the androgen receptor. We hypothesized that androgen deprivation needs additional transcription factors to orchestrate the changes taking place in the gland after castration and for the adaptation of the epithelial cells to the androgen-deprived environment, ultimately contributing to the origin of castration-resistant prostate cancer. This study was undertaken to identify transcription factors that regulate gene expression after androgen deprivation by castration (Cas). For the sake of comparison, we extended the analysis to the effects of administration of a high dose of 17 beta-estradiol (E2) and a combination of both (Cas+ E2). We approached this by (i) identifying gene expression profiles and enrichment terms, and by searching for transcription factors in the derived regulatory pathways; and (ii) by determining the density of putative transcription factor binding sites in the proximal promoter of the 10 most up- or down-regulated genes in each experimental group in comparison to the controls Gapdh and Tbp7. Filtering and validation confirmed the expression and localized EVI1 (Mecom), NFY, ELK1, GATA2, MYBL1, MYBL2, and NFkB family members (NFkB1, NFkB2, REL, RELA and RELB) in the epithelial and/or stromal cells. These transcription factors represent major regulators of epithelial cell survival and immaturity as well as an adaptation of the gland as an immune barrier in the absence of functional stimulation by androgens. Elk1 was expressed in smooth muscle cells and was up-regulated after day 4. Evi1 and Nfy genes are expressed in both epithelium and stroma, but were apparently not affected by androgen deprivation. (AU)

• FAPESP's process: 09/16150-6 - Androgen regulation, sinalization and cellular interactions in prostate development, physiology and regression
• Grantee: Hernandes Faustino de Carvalho
• Support Opportunities: Research Projects - Thematic Grants