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Article

Taxol-induced growth arrest and apoptosis is associated with the upregulation of the Cdk inhibitor, p21WAF1/CIP1, in human breast cancer cells

  • Authors:
    • Yung Hyun Choi
    • Young Hyun Yoo
  • View Affiliations / Copyright

    Affiliations: Department of Biochemistry, Dongeui University College of Oriental Medicine, Busan 614-052, Republic of Korea, Department of Anatomy and Cell Biology and Mitochondria Hub Regulation Center, College of Medicine, Dong-A University, Busan 602-714, Republic of Korea
  • Pages: 2163-2169
    |
    Published online on: September 26, 2012
       https://doi.org/10.3892/or.2012.2060
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Abstract

The anticancer agent, taxol, stabilizes tubulin polymerization, resulting in arrest at the G2/M phase of the cell cycle and apoptotic cell death. However, the molecular mechanism of this growth inhibition and apoptosis is poorly understood. In this study, we used MCF-7 and MDA-MB-231 human breast carcinoma cells which have different estrogen receptor (ER) and tumor suppressor p53 statuses to examine the mechanisms of taxol-induced growth inhibition and apoptosis. Treatment of the cells with taxol resulted in a time-dependent inhibition of cell viability, which was accompanied by an accumulation of cells at G2/M and the sub-G1 apoptotic region, determined by flow cytometric analysis. Furthermore, chromatin condensation, DNA ladder formation and proteolytic cleavage of poly(ADP-ribose) polymerase (PARP) in both cell lines were observed following treatment with taxol, indicating the occurrence of apoptotic cell death. Western blot analysis using whole cell lysates from MCF-7 and MDA-MB-231 cells treated with taxol demonstrated that taxol treatment inhibited expression of cyclin A and cyclin B1 proteins in a time-dependent manner. The inhibitory effects of taxol on cell growth and apoptosis induced by taxol were also associated with the downregulation of Wee1 kinase expression and a marked induction in the activity of the cyclin-dependent kinase inhibitor, p21WAF/CIP1. Furthermore, taxol elevated p21 promoter activity in both cell lines. These findings suggest that taxol-induced G2/M arrest and apoptosis in human breast carcinoma cells is mediated through the ER- and p53-independent upregulation of p21.
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Copy and paste a formatted citation
Spandidos Publications style
Choi YH and Yoo YH: Taxol-induced growth arrest and apoptosis is associated with the upregulation of the Cdk inhibitor, p21WAF1/CIP1, in human breast cancer cells. Oncol Rep 28: 2163-2169, 2012.
APA
Choi, Y.H., & Yoo, Y.H. (2012). Taxol-induced growth arrest and apoptosis is associated with the upregulation of the Cdk inhibitor, p21WAF1/CIP1, in human breast cancer cells. Oncology Reports, 28, 2163-2169. https://doi.org/10.3892/or.2012.2060
MLA
Choi, Y. H., Yoo, Y. H."Taxol-induced growth arrest and apoptosis is associated with the upregulation of the Cdk inhibitor, p21WAF1/CIP1, in human breast cancer cells". Oncology Reports 28.6 (2012): 2163-2169.
Chicago
Choi, Y. H., Yoo, Y. H."Taxol-induced growth arrest and apoptosis is associated with the upregulation of the Cdk inhibitor, p21WAF1/CIP1, in human breast cancer cells". Oncology Reports 28, no. 6 (2012): 2163-2169. https://doi.org/10.3892/or.2012.2060
Copy and paste a formatted citation
x
Spandidos Publications style
Choi YH and Yoo YH: Taxol-induced growth arrest and apoptosis is associated with the upregulation of the Cdk inhibitor, p21WAF1/CIP1, in human breast cancer cells. Oncol Rep 28: 2163-2169, 2012.
APA
Choi, Y.H., & Yoo, Y.H. (2012). Taxol-induced growth arrest and apoptosis is associated with the upregulation of the Cdk inhibitor, p21WAF1/CIP1, in human breast cancer cells. Oncology Reports, 28, 2163-2169. https://doi.org/10.3892/or.2012.2060
MLA
Choi, Y. H., Yoo, Y. H."Taxol-induced growth arrest and apoptosis is associated with the upregulation of the Cdk inhibitor, p21WAF1/CIP1, in human breast cancer cells". Oncology Reports 28.6 (2012): 2163-2169.
Chicago
Choi, Y. H., Yoo, Y. H."Taxol-induced growth arrest and apoptosis is associated with the upregulation of the Cdk inhibitor, p21WAF1/CIP1, in human breast cancer cells". Oncology Reports 28, no. 6 (2012): 2163-2169. https://doi.org/10.3892/or.2012.2060
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