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A Novel Mechanism Driving Poor-Prognosis Prostate Cancer: Overexpression of the DNA Repair Gene, Ribonucleotide Reductase Small Subunit M2 (RRM2).


ABSTRACT: PURPOSE:Defects in genes in the DNA repair pathways significantly contribute to prostate cancer progression. We hypothesize that overexpression of DNA repair genes may also drive poorer outcomes in prostate cancer. The ribonucleotide reductase small subunit M2 (RRM2) is essential for DNA synthesis and DNA repair by producing dNTPs. It is frequently overexpressed in cancers, but very little is known about its function in prostate cancer. EXPERIMENTAL DESIGN:The oncogenic activity of RRM2 in prostate cancer cells was assessed by inhibiting or overexpressing RRM2. The molecular mechanisms of RRM2 function were determined. The clinical significance of RRM2 overexpression was evaluated in 11 prostate cancer clinical cohorts. The efficacy of an RRM2 inhibitor (COH29) was assessed in vitro and in vivo. Finally, the mechanism underlying the transcriptional activation of RRM2 in prostate cancer tissue and cells was determined. RESULTS:Knockdown of RRM2 inhibited its oncogenic function, whereas overexpression of RRM2 promoted epithelial mesenchymal transition in prostate cancer cells. The prognostic value of RRM2 RNA levels in prostate cancer was confirmed in 11 clinical cohorts. Integrating the transcriptomic and phosphoproteomic changes induced by RRM2 unraveled multiple oncogenic pathways downstream of RRM2. Targeting RRM2 with COH29 showed excellent efficacy. Thirteen putative RRM2-targeting transcription factors were bioinformatically identified, and FOXM1 was validated to transcriptionally activate RRM2 in prostate cancer. CONCLUSIONS:We propose that increased expression of RRM2 is a mechanism driving poor patient outcomes in prostate cancer and that its inhibition may be of significant therapeutic value.

SUBMITTER: Mazzu YZ 

PROVIDER: S-EPMC6820162 | biostudies-literature | 2019 Jul

REPOSITORIES: biostudies-literature

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A Novel Mechanism Driving Poor-Prognosis Prostate Cancer: Overexpression of the DNA Repair Gene, Ribonucleotide Reductase Small Subunit M2 (RRM2).

Mazzu Ying Z YZ   Armenia Joshua J   Chakraborty Goutam G   Yoshikawa Yuki Y   Coggins Si'Ana A SA   Nandakumar Subhiksha S   Gerke Travis A TA   Pomerantz Mark M MM   Qiu Xintao X   Zhao Huiyong H   Atiq Mohammad M   Khan Nabeela N   Komura Kazumasa K   Lee Gwo-Shu Mary GM   Fine Samson W SW   Bell Connor C   O'Connor Edward E   Long Henry W HW   Freedman Matthew L ML   Kim Baek B   Kantoff Philip W PW  

Clinical cancer research : an official journal of the American Association for Cancer Research 20190417 14


<h4>Purpose</h4>Defects in genes in the DNA repair pathways significantly contribute to prostate cancer progression. We hypothesize that overexpression of DNA repair genes may also drive poorer outcomes in prostate cancer. The ribonucleotide reductase small subunit M2 (RRM2) is essential for DNA synthesis and DNA repair by producing dNTPs. It is frequently overexpressed in cancers, but very little is known about its function in prostate cancer.<h4>Experimental design</h4>The oncogenic activity o  ...[more]

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