Regulation of survivin by retinoic acid and its role in paclitaxel-mediated cytotoxicity in MCF-7 breast cancer cells

Apoptosis : an International Journal on Programmed Cell Death
M A Christine PrattL Isabel Renart

Abstract

The chemotherapeutic drug paclitaxel induces microtubular stabilization and mitotic arrest associated with increased survivin expression. Survivin is a member of the inhibitor of apoptosis (iap) family which is highly expressed in during G2/M phase where it regulates spindle formation during mitosis. It is also constitutively overexpressed in most cancer cells where it may play a role in chemotherapeutic resistance. MCF-7 breast cancer cells stably overexpressing the sense strand of survivin (MCF-7(survivin-S) cells) were more resistant to paclitaxel than cells depleted of survivin (MCF-7(survivin-AS) despite G2/M arrest in both cell lines. However, survivin overexpression did not protect cells relative to control MCF-7(pcDNA3) cells. Paclitaxel-induced cytotoxicity can be enhanced by retinoic acid and here we show that RA strongly reduces survivin expression in MCF-7 cells and prevents paclitaxel-mediated induction of survivin expression. Mitochondrial release of cytochrome c after paclitaxel alone or in combination with RA was weak, however robust Smac release was observed. While RA/paclitaxel-treated MCF-7 (pcDNA3) cultures contained condensed apoptotic nuclei, MCF-7(survivin-S) nuclei were morphologically distinct with hype...Continue Reading

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