부산대학교 도서관

Objective Cisplatin, the most common chemotherapeutic drug for the treatment of advanced stage cervical cancers has limitations in terms of drugs resistance observed in patients partly due to functional DNA damage repair (DDR) processes in the cell. Mediator of DNA damage checkpoint 1 (MDC1) is an important protein in the Ataxia telangiectasia mutated (ATM) mediated double stranded DNA break (DSB) repair pathway. In this regard, we investigated the effect of MDC1 change in expression on the cisplatin sensitivity in cervical cancer cells. Results Through modulation of MDC1 expression in the cervical cancer cell lines; Hela, SiHa and Caski, we found that all the three cell lines silenced for MDC1 exhibited higher sensitivity to cisplatin treatment with inefficiency in accumulation of p [gamma]H2AX, Ser 139 foci and increased accumulation of pChk2 Thr 68 at the damaged chromatin followed by enhanced apoptosis. Further, we observed the increased p53 Ser 15 phosphorylation in the MDC1 depleted cells. Our studies suggest that MDC1 expression could be a key determinant in cervical cancer prognosis and its depletion in combination with cisplatin has the potential to be explored for the sensitisation of chemo-resistant cervical cancer cells. Keywords: Cisplatin, Cervical cancer, DNA damage repair, Ataxia telangiectasia mutated, MDC1, Apoptosis
Author(s): Neeru Singh[sup.2] , Rashmi Bhakuni[sup.2] , Dimple Chhabria[sup.2] and Sivapriya Kirubakaran[sup.1] Introduction Cervical cancer is amongst the commonly diagnosed cancers in women, with a significant proportion of patients treated [...]