Simon Hayward
Last active: 2/19/2015

The stress response mediator ATF3 represses androgen signaling by binding the androgen receptor.

Wang H, Jiang M, Cui H, Chen M, Buttyan R, Hayward SW, Hai T, Wang Z, Yan C
Mol Cell Biol. 2012 32 (16): 3190-202

PMID: 22665497 · PMCID: PMC3434546 · DOI:10.1128/MCB.00159-12

Activating transcription factor 3 (ATF3) is a common mediator of cellular stress response signaling and is often aberrantly expressed in prostate cancer. We report here that ATF3 can directly bind the androgen receptor (AR) and consequently repress AR-mediated gene expression. The ATF3-AR interaction requires the leucine zipper domain of ATF3 that independently binds the DNA-binding and ligand-binding domains of AR, and the interaction prevents AR from binding to cis-acting elements required for expression of androgen-dependent genes while inhibiting the AR N- and C-terminal interaction. The functional consequences of the loss of ATF3 expression include increased transcription of androgen-dependent genes in prostate cancer cells that correlates with increased ability to grow in low-androgen-containing medium and increased proliferative activity of the prostate epithelium in ATF3 knockout mice that is associated with prostatic hyperplasia. Our results thus demonstrate that ATF3 is a novel repressor of androgen signaling that can inhibit AR functions, allowing prostate cells to restore homeostasis and maintain integrity in the face of a broad spectrum of intrinsic and environmental insults.

MeSH Terms (18)

Activating Transcription Factor 3 Animals Cell Line, Tumor Cell Proliferation Epithelium Gene Expression Regulation Gene Expression Regulation, Neoplastic Homeostasis Humans Male Mice Mice, Knockout Models, Biological Prostate Prostatic Neoplasms Protein Structure, Tertiary Receptors, Androgen Signal Transduction

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