Dysregulation of spliceosome gene expression in advanced prostate cancer by RNA-binding protein PSF

K Takayama, T Suzuki, T Fujimura… - Proceedings of the …, 2017 - National Acad Sciences
K Takayama, T Suzuki, T Fujimura, Y Yamada, S Takahashi, Y Homma, Y Suzuki, S Inoue
Proceedings of the National Academy of Sciences, 2017National Acad Sciences
Developing therapeutic approaches are necessary for treating hormone-refractory prostate
cancer. Activation of androgen receptor (AR) and its variants' expression along with the
downstream signals are mostly important for disease progression. However, the mechanism
for marked increases of AR signals and its expression is still unclear. Here, we revealed that
various spliceosome genes are aberrantly induced by RNA-binding protein PSF, leading to
enhancement of the splicing activities for AR expression. Our high-speed sequence …
Developing therapeutic approaches are necessary for treating hormone-refractory prostate cancer. Activation of androgen receptor (AR) and its variants’ expression along with the downstream signals are mostly important for disease progression. However, the mechanism for marked increases of AR signals and its expression is still unclear. Here, we revealed that various spliceosome genes are aberrantly induced by RNA-binding protein PSF, leading to enhancement of the splicing activities for AR expression. Our high-speed sequence analyses identified global PSF-binding transcripts. PSF was shown to stabilize and activate key long noncoding RNAs and AR-regulated gene expressions in prostate cancer cells. Interestingly, mRNAs of spliceosome-related genes are putative primary targets of PSF. Their gene expressions are up-regulated by PSF in hormone-refractory prostate cancer. Moreover, PSF coordinated these spliceosome proteins to form a complex to promote AR splicing and expression. Thus, targeting PSF and its related pathways implicates the therapeutic possibility for hormone-refractory prostate cancer.
National Acad Sciences