A novel mechanism driving poor-prognosis prostate cancer: Overexpression of the DNA repair gene, ribonucleotide reductase small subunit M2 (RRM2) Journal Article

Authors: Mazzu, Y. Z.; Armenia, J.; Chakraborty, G.; Yoshikawa, Y.; Coggins, S. A.; Nandakumar, S.; Gerke, T. A.; Pomerantz, M. M.; Qiu, X.; Zhao, H.; Atiq, M.; Khan, N.; Komura, K.; Lee, G. S. M.; Fine, S. W.; Bell, C.; O'Connor, E.; Long, H. W.; Freedman, M. L.; Kim, B.; Kantoff, P. W.
Article Title: 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.
Keywords: tumors; progression; expression; cells; degradation; signature; enrichment analysis
Journal Title: Clinical Cancer Research
Volume: 25
Issue: 14
ISSN: 1078-0432
Publisher: American Association for Cancer Research  
Date Published: 2019-07-15
Start Page: 4480
End Page: 4492
Language: English
ACCESSION: WOS:000478018100029
DOI: 10.1158/1078-0432.Ccr-18-4046
PUBMED: 30996073
Notes: Article -- Source: Wos
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MSK Authors
  1. Samson W Fine
    335 Fine
  2. Ying Zhang Mazzu
    9 Mazzu
  3. Philip Wayne Kantoff
    84 Kantoff
  4. Joshua   Armenia
    30 Armenia
  5. HuiYong   Zhao
    8 Zhao
  6. Nabeela Ali Khan
    5 Khan
  7. Mohammad Atiq
    4 Atiq