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Transcriptional upregulation and activation of p55Cdc via p34cdc2 in Taxol-induced apoptosis

Abstract

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 p34cdc2 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 p34cdc2 activation play a critical role in Taxol-induced cell death.

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Acknowledgements

This work was supported by NIH grants CA58880 and Ovarian SPORE grant P50 CA83639 (to M-C Hung) and by a postdoctoral fellowship from the US Army Breast Cancer Research Training Grant Program, Grant No. DAMD17-99-1-9264 (to K Makino).

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Makino, K., Yu, D. & Hung, MC. Transcriptional upregulation and activation of p55Cdc via p34cdc2 in Taxol-induced apoptosis. Oncogene 20, 2537–2543 (2001). https://doi.org/10.1038/sj.onc.1204366

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