期刊
GYNECOLOGIC ONCOLOGY
卷 115, 期 3, 页码 407-413出版社
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.ygyno.2009.08.007
关键词
Ovarian cancer; CA125/MUC16; Drug resistance; Genotoxic drugs
资金
- Universite de Sherbrooke
- National Cancer Institute
- Canadian Cancer Society [011225, 014263]
Objective. Little is known about the biological functions of CA125/MUC16 tumor antigen. Here, we examined the role of CA125/MUC16 in regulating the sensitivity of epithelial ovarian carcinoma (EOC) cells to different drugs. Methods. An endoplasmic reticulum targeted single-chain antibody (scFv) was used to clown-regulate cell surface expression of CA125/MUC16 in NIH:OVCAR3 cells and the C-terminal domain (CTD) of MUC16 was ectopically expressed in CA125-negative SKOV3 cells. Sensitivity to genotoxic agents and to inhibitors of microtubule depolymerization was examined in NIH:OVCAR3 and SKOV3 cell sublines. Cell viability was determined by XTT assay, apoptosis by propidium iodide staining and caspase activation by Western blot and fluorogenic assay. Results. Down-regulation of cell Surface MUC16 decreases cisplatin IC50 by 5-fold in NIH:OVCAR3 cells but does not affect paclitaxel IC50. We found that the sensitivity to other genotoxic agents such as cyclophosphamide, doxorubicine and etoposide was also increased by down-regulation of MUC16. Caspase-9 and caspase-3 activation also significantly augmented in cisplatin-treated NIH:OVCAR3 cells expressing the anti-MUC16 scFv. Ectopic expression of MUC16 CTD has the opposite effect. Cisplatin sensitivity and caspases activation are decreased by the ectopic expression of MUC16 CTD in SKOV3 cells. Conclusions. CA125/MUC16 selectively modulates the sensitivity of EOC cells to genotoxic agents. The MUC16 CTD appears to be Sufficient to promote cisplatin resistance. (C) 2009 Elsevier Inc. All rights reserved.
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