Xu, FL and Rbaibi, Y and Kiselyov, K and Lazo, JS and Wipf, P and Saunders, WS
(2010)
Mitotic slippage in non-cancer cells induced by a microtubule disruptor, disorazole C<inf>1</inf>.
BMC Chemical Biology, 10.
Abstract
Background. Disorazoles are polyene macrodiolides isolated from a myxobacterium fermentation broth. Disorazole C1was newly synthesized and found to depolymerize microtubules and cause mitotic arrest. Here we examined the cellular responses to disorazole C1in both non-cancer and cancer cells and compared our results to vinblastine and taxol. Results. In non-cancer cells, disorazole C1induced a prolonged mitotic arrest, followed by mitotic slippage, as confirmed by live cell imaging and cell cycle analysis. This mitotic slippage was associated with cyclin B degradation, but did not require p53. Four assays for apoptosis, including western blotting for poly(ADP-ribose) polymerase cleavage, microscopic analyses for cytochrome C release and annexin V staining, and gel electrophoresis examination for DNA laddering, were conducted and demonstrated little induction of apoptosis in non-cancer cells treated with disorazole C1. On the contrary, we observed an activated apoptotic pathway in cancer cells, suggesting that normal and malignant cells respond differently to disorazole C1. Conclusion. Our studies demonstrate that non-cancer cells undergo mitotic slippage in a cyclin B-dependent and p53-independent manner after prolonged mitotic arrest caused by disorazole C1. In contrast, cancer cells induce the apoptotic pathway after disorazole C1treatment, indicating a possibly significant therapeutic window for this compound. © 2010 Xu et al; licensee BioMed Central Ltd.
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