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Effect of Mad2 on paclitaxel-induced cell death in ovarian cancer cells

Xing Hao1, Zhigang Zhou, Shuangmei Ye

  • 1Huazhong University of Science and Technology, Wuhan, China. haoxing1981@yahoo.com.cn

Journal of Huazhong University of Science and Technology. Medical Sciences = Hua Zhong Ke Ji Da Xue Xue Bao. Yi Xue Ying De Wen Ban = Huazhong Keji Daxue Xuebao. Yixue Yingdewen Ban
|November 11, 2010
PubMed

Insights

Reduced Mad2 protein levels weaken the spindle assembly checkpoint, contributing to paclitaxel resistance in ovarian cancer cells. This suggests Mad2 is crucial for maintaining drug sensitivity.

Area of Science:

  • Oncology
  • Cell Biology
  • Molecular Biology

Background:

  • The spindle assembly checkpoint (SAC) is critical for accurate chromosome segregation.
  • Mad2 protein is a key regulator of the SAC.
  • Ovarian cancer cells can develop resistance to chemotherapy, such as paclitaxel.

Purpose of the Study:

  • To investigate the role of Mad2 protein levels in paclitaxel resistance in ovarian cancer cell lines.
  • To determine the impact of altering Mad2 expression on the spindle assembly checkpoint and drug sensitivity.

Main Methods:

  • Utilized paclitaxel-resistant SKOV3 and paclitaxel-sensitive A2780 ovarian cancer cell lines.
  • Manipulated Mad2 protein levels using recombinant plasmid transfection (pEGFP-Mad2) and small interfering RNA (siRNA).
  • Assessed Mad2 gene expression via Western blotting, cell cycle arrest using flow cytometry, and paclitaxel sensitivity.

Main Results:

  • Paclitaxel-resistant SKOV3 cells showed incomplete G(2)/M phase arrest compared to A2780 cells.
  • Modulating Mad2 levels reversed paclitaxel sensitivity in both cell lines.
  • Changes in Mad2 expression significantly altered the number of cells arrested at G(2)/M phase and affected Bcl-2 expression.

Conclusions:

  • Weakened spindle assembly checkpoint due to reduced Mad2 expression is associated with paclitaxel resistance in ovarian cancer.
  • Mad2 protein level is a significant factor in determining ovarian cancer cell response to paclitaxel.
  • The Bcl-2 protein may play a role in the mechanism of paclitaxel resistance involving Mad2.

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