Oncotarget

Priority Research Papers:

Aurora A kinase regulates non-homologous end-joining and poly(ADP-ribose) polymerase function in ovarian carcinoma cells

Thuy-Vy Do, Jeff Hirst, Stephen Hyter, Katherine F. Roby and Andrew K. Godwin _

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Oncotarget. 2017; 8:50376-50392. https://doi.org/10.18632/oncotarget.18970

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Abstract

Thuy-Vy Do1, Jeff Hirst1, Stephen Hyter1, Katherine F. Roby2,3 and Andrew K. Godwin1,3

1 Department of Pathology and Laboratory Medicine, University of Kansas Medical Center, Kansas City, KS, USA

2 Anatomy and Cell Biology, University of Kansas Medical Center, Kansas City, KS, USA

3 University of Kansas Cancer Center, Kansas City, KS, USA

Correspondence to:

Andrew K. Godwin, email:

Keywords: Aurora A kinase, ovarian cancer, PARP, alisertib, double-strand break

Received: April 07, 2017 Accepted: June 16, 2017 Published: July 05, 2017

Abstract

Ovarian cancer is usually diagnosed at late stages when cancer has spread beyond the ovary and patients ultimately succumb to the development of drug-resistant disease. There is an urgent and unmet need to develop therapeutic strategies that effectively treat ovarian cancer and this requires a better understanding of signaling pathways important for ovarian cancer progression. Aurora A kinase (AURKA) plays an important role in ovarian cancer progression by mediating mitosis and chromosomal instability. In the current study, we investigated the role of AURKA in regulating the DNA damage response and DNA repair in ovarian carcinoma cells. We discovered that AURKA modulated the expression and activity of PARP, a crucial mediator of DNA repair that is a target of therapeutic interest for the treatment of ovarian and other cancers. Further, specific inhibition of AURKA activity with the small molecule inhibitor, alisertib, stimulated the non-homologous end-joining (NHEJ) repair pathway by elevating DNA-PKcs activity, a catalytic subunit required for double-strand break (DSB) repair, as well as decreased the expression of PARP and BRCA1/2, which are required for high-fidelity homologous recombination-based DNA repair. Further, AURKA inhibition stimulates error-prone NHEJ repair of DNA double-strand breaks with incompatible ends. Consistent with in vitro findings, alisertib treatment increased phosphorylated DNA-PKcs(pDNA-PKcsT2609) and decreased PARP levels in vivo. Collectively, these results reveal new non-mitotic functions for AURKA in the regulation of DNA repair, which may inform of new therapeutic targets and strategies for treating ovarian cancer.


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