Journal
ONCOGENE
Volume 20, Issue 20, Pages 2537-2543Publisher
NATURE PUBLISHING GROUP
DOI: 10.1038/sj.onc.1204366
Keywords
cDNA array; Taxol; p55Cdc; p34(cdc2); apoptosis
Funding
- NCI NIH HHS [CA58880, P50 CA83639] Funding Source: Medline
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Paclitaxel (Taxol) is a potent and highly effective antineoplastic agent for the treatment of advanced, drug-refractory, metastatic breast cancers. Taxol not only induces tubulin polymerization, stabilizes microtubules, blocks cell cycle progression, and induces apoptosis, but it also alters gene expression. Here, we have identified that Taxol can upregulate expression of the gene encoding the cell cycle protein p55Cdc by using cDNA array technique. Taxol induced p55Cdc mRNA expression through activation of the p55Cdc promoter, which led to increase p55Cdc protein expression. Taxol also activated p55Cdc-associated kinase, In addition, overexpression of the p55Cdc gene resulted in cell death in both HeLa cells and NIH3T3 cells in a dose-dependent manner. A dominant-negative mutant of p34(cdc2) blocked Taxol-induced p55Cdc activation and inhibited p55Cdc-induced and Taxol-induced cell death. Our data suggest that transcriptional upregulation of p55Cdc and activation of p55Cdc by Taxol-mediated p34(cdc2) activation play a critical role in Taxol-induced cell death.
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