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http://dx.doi.org/10.5352/JLS.2010.20.4.519

Paclitaxel Induced Caspase-Independent Mitotic Catastrophe in Rabbit Articular Chondrocyte  

Im, Jeong-Hee (Department of Biological Sciences, College of Natural Sciences, Kongju National University)
Kim, Song-Ja (Department of Biological Sciences, College of Natural Sciences, Kongju National University)
Publication Information
Journal of Life Science / v.20, no.4, 2010 , pp. 519-527 More about this Journal
Abstract
Paclitaxel is known as a potent inhibitor of microtubule depolymerization. It leads to mitotic arrest and cell death by stabilizing the spindle in various cell types. Here, we investigated the effects of paclitaxel on the proliferation and cell death of rabbit articular chondrocytes. Paclitaxel inhibited proliferation in a dose- and time- dependent manner, determined by MTT assay in rabbit articular chondrocytes. We also established paclitaxel-induced G2/M arrest by fluorescent activated cell sorter (FACS) analysis. Paclitaxel increased expression of cyclin B, p53 and p21, while reducing expression of cdc2 and cdc25C in chondrocytes, as detected by Western blot analysis. Interestingly, paclitaxel showed the mitotic catastrophe that leads to abnormal nucleus division and cell death without DNA fragmentation through activation of caspase. Cell death by mitotic catastrophe in cells treated with paclitaxel was suppressed by inhibiting G1/S arrest with 2 mM thymidine. These results demonstrate that paclitaxel induces cell death via mitotic catastrophe without activation of casepase in rabbit articular chondrocytes.
Keywords
Caspase-3; chondrocyte; mitotic catastrophe; paclitaxel;
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