Suppression of REV7 enhances cisplatin sensitivity in ovarian clear cell carcinoma cells

Cancer Science

Kaoru Niimi²  Yoshiki Murakumo²  Naoki Watanabe²  Takuya Kato²  Shinji Mii²  Atsushi Enomoto²  Masato Asai²  Naoya Asai²  Eiko Yamamoto¹  Hiroaki Kajiyama¹  Kiyosumi Shibata¹  Fumitaka Kikkawa¹ 

[1] Department of Obstetrics and Gynecology, Nagoya University Graduate School of Medicine, Nagoya, Japan;Department of Pathology, Nagoya University Graduate School of Medicine, Nagoya, Japan

关键词: Apoptosis;    chemosensitivity;    cisplatin;    DNA damage;    ovarian clear cell carcinoma;   

DOI  :  10.1111/cas.12390

来源: Wiley

【 摘 要 】

Abstract

Human REV7 (also known as MAD2L2 and MAD2B) is involved in DNA repair, cell cycle regulation, gene transcription, and carcinogenesis. In this study, we evaluated the expression of REV7 in epithelial ovarian cancer (EOC) and analyzed the association between its expression and chemosensitivity in ovarian clear cell carcinoma (CCC) cells. Expression of REV7 in human EOC tissues was assessed by immunohistochemical staining. Expression was detected in the majority of EOCs (92.0%) with especially high levels of expression frequently observed in CCCs (73.5%) compared with that of non-CCCs (53.4%). Enhanced immunoreactivity to REV7 was associated with poor prognosis represented by reduced progression-free survival in advanced stage (stage II–IV) EOC as assessed using Kaplan–Meier curves and log–rank tests. The effects of REV7 knockdown on cell proliferation and chemosensitivity in CCC cells were also analyzed in vitro and in vivo. Knockdown of REV7 in CCC cells decreased cell proliferation without affecting cell cycle distribution. Additionally, the number of apoptotic cells and DNA damaged cells were increased after cisplatin treatment. In a nude mouse tumor xenograft model, inoculated REV7-knockdown tumors showed significantly reduced tumor volumes after cisplatin treatment compared with those of the control group. These findings indicate that depletion of REV7 enhances sensitivity to cisplatin treatment in CCC, suggesting that REV7 is a candidate molecular target in CCC management.

【 授权许可】

CC BY-NC-ND   
© 2014 The Authors. Cancer Science published by Wiley Publishing Asia Pty Ltd on behalf of Japanese Cancer Association.

Creative Commons Attribution-NonCommercial-NoDerivs License, which permits use and distribution in any medium, provided the original work is properly cited, the use is non-commercial and no modifications or adaptations are made.