Abstract
Recent studies indicate that estrogen-related receptors (ERRs) are involved in similar estrogen receptor (ER) regulatory pathways and play roles in energy and lipid metabolism. Here, we analysed the functional role of ERRβ in prostate cancer cell growth regulation in an androgen-sensitive and androgen-insensitive prostate cancer cell lines. ERRβ was expressed in normal human prostates, but exhibited a reduced expression in prostate cancer lesions. Stable ERRβ expression suppressed significantly cell proliferation and tumorigenicity of LNCaP and DU145 cells, accompanied by an S-phase suppression and increased p21 expression. Reporter and chromatin immunoprecipitation assays showed that ERRβ could directly transactivate p21 gene promoter, which could be further enhanced by peroxisome proliferator-activated receptor-γ coactivator-1α. Truncation analysis showed that ERRβ-mediated p21 transactivation and prostate cancer cell growth inhibition required intact DNA-binding domain and AF2 domains in ERRβ. Interestingly, ERRβ displayed a cell cycle associated downregulated expression pattern in ERRβ-transduced and non-transduced cells. Finally, we showed that ERRβ-mediated growth inhibition could be potentiated by an ERRβ/γ agonist DY131. Knockdown of ERRβ by RNA interference could reduce the DY131-induced growth inhibition in prostate cancer cells. Taken together, our findings indicate that ERRβ performs a tumor suppressing function in prostate cancer cells, and targeting ERRβ could be a potential therapeutic strategy for prostate cancer.
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Acknowledgements
This research was supported by a Competitive Earmarked Research Grant from Research Grants Council (CUHK4411/06M) and Li Ka-Shing Institute of Health Sciences.
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Yu, S., Wong, Y., Wang, X. et al. Orphan nuclear receptor estrogen-related receptor-β suppresses in vitro and in vivo growth of prostate cancer cells via p21WAF1/CIP1 induction and as a potential therapeutic target in prostate cancer. Oncogene 27, 3313–3328 (2008). https://doi.org/10.1038/sj.onc.1210986
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DOI: https://doi.org/10.1038/sj.onc.1210986
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