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- W2105421433 abstract "Objective Resistance to platinum-based therapeutic agents represents a major hurdle in the treatment of epithelial ovarian cancer (EOC). There is an urgent need to better understand the underlying mechanisms. Here, we investigated the role of RUNX3 in carboplatin resistance in EOC cells. Methods Expression of RUNX3 was determined in human EOC cell line A2780s (cisplatin-sensitive) and A2780cp (cisplatin-resistant), human ovarian surface epithelium (OSE) and primary EOC cells. The effects of RUNX3 expression on sensitivity to carboplatin were determined in A2780s and A2780cp cells using neutral red uptake and clonogenic assays. Carboplatin-induced apoptosis was determined by measuring cleaved PARP using Western blotting. The expression of cellular inhibitor of apoptosis protein-2 (cIAP2) and its regulation by RUNX3 were assessed by quantitative RT-PCR and Western blotting. Results The expression of RUNX3 was elevated in A2780cp cells compared to A2780s cells and in EOC tissues from chemoresistant patients compared to those from chemosensitive patients. Overexpression of RUNX3 rendered A2780s cells more resistant to carboplatin, whereas inhibition of RUNX3 increased sensitivity to carboplatin in A2780cp cells. Inhibition of RUNX3 potentiated carboplatin-induced apoptosis in A2780cp cells as demonstrated by more pronounced PARP cleavage. Interestingly, the expression of cIAP2 was elevated in A2780cp cells compared to A2780s cells. Overexpression of RUNX3 increased cIAP2 expression in A2780s cells, whereas inhibition of RUNX3 decreased cIAP2 expression and potentiated carboplatin-induced decrease of cIAP2 in A2780cp cells. Conclusions RUNX3 contributes to carboplatin resistance in EOC cells and may hold promise as a therapeutic target to treat EOC and/or a biomarker to predict chemoresistance." @default.
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- W2105421433 date "2015-09-01" @default.
- W2105421433 modified "2023-09-26" @default.
- W2105421433 title "RUNX3 contributes to carboplatin resistance in epithelial ovarian cancer cells" @default.
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- W2105421433 doi "https://doi.org/10.1016/j.ygyno.2015.07.009" @default.
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