期刊
MOLECULAR ENDOCRINOLOGY
卷 27, 期 4, 页码 635-648出版社
ENDOCRINE SOC
DOI: 10.1210/me.2012-1294
关键词
NURSA Molecule Pages: Nuclear Receptors: GR; Ligands: Dihydrotestosterone
资金
- National Institutes of Health [U01NS041071, S10RR0254970]
- National Institute on Minority Health and Health Disparities (NIMHD) [MD004038, DK055748]
- NCI [CA091408, CA163069, G12 MD007586]
- National Center for Research Resources (NCRR)/NIH [UL1 RR024975-01, 2 UL1 TR000445-06]
Androgen receptor (AR) signaling is essential for prostate cancer (PCa) development in humans. The initiation of prostate malignancy and progression to a castration-resistant stage are largely contributed by the modulation of AR activity through its coregulatory proteins. We and others previously reported that p14 alternative reading frame (ARF) expression is positively correlated with the disease progression and severity of PCa. Here, we provide evidence that p14ARF physically interacts with AR and functions as an AR corespressor in both an androgen-dependent and androgen-independent manner. Endogenous ARF (p14ARF in human and p19ARF in mouse) and AR colocalize in both human PCa cells in vitro and PCa tissues of mouse and human in vivo. Overexpression of p14ARF in PCa cells significantly attenuates the activities of androgen response region (ARR2)-probasin and prostate-specific antigen (PSA) promoters. The forced expression of p14ARF in cells resulted in a suppression of PSA and NK transcription factor locus 1 (NKX3.1) expression. Conversely, knockdown of endogenous p14ARF in human PCa cells with short hairpin RNA enhanced AR transactivation activities in a dose-dependent and p53-independent manner. Furthermore, we demonstrated that p14ARF binds to both the N-terminal domain and the ligand-binding domain of AR, and the human double minute 2 (HDM2)-binding motif of p14ARF is required for the interaction of p14ARF and AR proteins. p14ARF perturbs the androgen-induced interaction between the Nterminus and C terminus of AR. Most importantly, we observed that the expression of PSA is reversely correlated with p14ARF in human prostate tissues. Taken together, our results reveal a novel function of ARF in modulation of AR transactivation in PCa. (Molecular Endocrinology 27:635-648, 2013)
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