Differential gene expression profiles in paclitaxel-induced cell cycle arrest and apoptosis in human breast cancer MCF-7 cells
Wang, J.; He, F.-t.; Tzang, C.-h.; Fong, W.-f.; Xiao, P.-g.; Han, R.; Yang, M.-s.
Yao Xue Xue Bao 40(12): 1099-1104
2005
ISSN/ISBN: 0513-4870 PMID: 16496673 Document Number: 593022
To elucidate the molecular mechanism of cell cycle arrest and apoptosis of MCF-7 cells induced by paclitaxel. Flow cytometry was used to determine the cell cycle changes of MCF-7 cells upon paclitaxel treatment. Gene expression profiles of MCF-7 cells induced by paclitaxel were obtained by using cDNA microarrays containing 9984 genes and expressed sequence tags (ESTs). Cell cycle analysis showed that 77.8% of cells arrested at G2/M phase and 1.3% of cells underwent apoptosis upon 100 nmol x L(-1) paclitaxel treatment for 24 hours; cDNA microarray results revealed that 27 and 77 genes were differentially expressed upon 12.5 nmol x L(-1) (IC50) and 100 nmol x L(-1) paclitaxel treatment, respectively. Paclitaxel stabilized microtubules and caused G2/M cell cycle arrest and apoptotic cell death in a concentration-dependent manner, which is associated with the regulation of selected genes related to microtubule assembly and cytoskeleton, cell cycle regulation, and DNA repair and apoptosis.