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 hypercondensed disorganized chromatin and released mitochondrial AIF-1. RA also reduced paclitaxel-associated levels of cyclin B1 expression consistent with mitotic exit. MCF-7(survivin-S) cells displayed a 30% increase in >2N/<4N ploidy while there was no change in this compartment in vector control cells following RA/paclitaxel. We propose that RA sensitizes MCF-7 cells to paclitaxel at least in part through survivin downregulation and the promotion of aberrant mitotic progression resulting in apoptosis. In addition we provide biochemical and morphological data which suggest that RA-treated MCF-7(survivin-S) cells can also undergo catastrophic mitosis when exposed to paclitaxel.
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Pratt, M., Niu, MY. & Renart, L. Regulation of survivin by retinoic acid and its role in paclitaxel-mediated cytotoxicity in MCF-7 breast cancer cells. Apoptosis 11, 589–605 (2006). https://doi.org/10.1007/s10495-006-4603-7
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DOI: https://doi.org/10.1007/s10495-006-4603-7