Abstract
The androgen receptor (AR) has a central role in prostate cancer progression, particularly treatment-resistance disease including castration-resistant prostate cancer. Loss of the p53 tumor suppressor, a nuclear transcription factor, is also known to contribute to prostate malignancy. Here we report that p53 is translocated to the cytoplasm by androgen-mediated induction of G3BP2, a newly described direct target gene of AR. G3BP2 induces both cell cycle progression and blocks apoptosis. Translocation of p53 is regulated by androgen-dependent sumoylation mediated by the G3BP2-interacting SUMO-E3 ligase, RanBP2. G3BP2 knockdown results in reduced tumor growth and increased nuclear p53 accumulation in mouse xenograft models of prostate cancer with or without long-term androgen deprivation. Moreover, strong cytoplasmic p53 localization is correlated clinically with elevated G3BP2 expression and predicts poor prognosis and disease progression to the hormone-refractory state. Our findings reveal a new AR-mediated mechanism of p53 inhibition that promotes treatment-resistant prostate cancer.
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Acknowledgements
We thank Professor Takashi Suzuki (Tohoku University) for comments on our pathological analysis. We thank E Sakamoto and N Sasaki for technical assistance. This work was supported by Grants of the Cell Innovation Program and the P-Direct (both to SI) from the MEXT, Japan; by Grants (to SI and KT) from the JSPS, Japan; by Grants-in-Aid (to SI) from the MHLW, Japan; by the Program for Promotion of Fundamental Studies in Health Sciences (to SI), NIBIO, Japan; by Grants from Takeda Science Foundation (to SI and KT); and by Grants from Mochida Memorial Research Foundation (to KT), Japan, the Yasuda Memorial Foundation (to KT) and Princess Takamatsu Cancer Research Fund (to KT).
Author contributions
KT designed the study, analyzed genome-wide androgen signaling and performed the animal experiments. DA and KT performed the cell-based experiments and analyzed data. DA, DO and ST performed immunohistochemistry. YS performed RNA-seq. TT performed mass spectrometry and supervised the study. SI designed and supervised the study. TU and TF discussed the data. DA, KT, TT and SI wrote the manuscript.
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Ashikari, D., Takayama, K., Tanaka, T. et al. Androgen induces G3BP2 and SUMO-mediated p53 nuclear export in prostate cancer. Oncogene 36, 6272–6281 (2017). https://doi.org/10.1038/onc.2017.225
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DOI: https://doi.org/10.1038/onc.2017.225
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