Voltage-gated K⁺ channels are associated with cell proliferation and cell cycle of ovarian cancer cell

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• 作者：Weng Zhanping ; Pan Xiaoyu ; Cui Na ; Wang Shenglan ; Wang Bo
• 关键词：Potassium channels ; Cell cycle ; Ovarian cancer cells ; Proliferation
• 刊名：Gynecologic Oncology
• 出版年：2007
• 期刊代码：295_00908258
• 类别：med
• 出版时间：February 2007
• 卷：104
• 期：2
• 页码：455-460
• 文件大小：317 K

摘要

>Objectives

To study the role of Voltage-gated potassium ion channels (Kv) in cell proliferation and cell cycle of ovarian cancer cell.

Methods

The effects of voltage-gate K⁺ channels on human ovarian cancer cell line (A2780 cell) proliferation and cell cycle were observed by means of MTT and flow cytometry. A variety of K⁺ channel blockers were used in order to differentiate the critical subtype of K⁺ channels involved. Mechanism of K⁺ channel in cell proliferation was explored by studying the relationship between the K⁺ channel and Ca²⁺ entry. Kv and L-type Ca²⁺ channel gene expressions were determined by RT-PCR.

Results

4-Aminopyridine, an inhibitor of voltage-gated K⁺ channels, significantly inhibited the proliferation of A2780 cells as measured by MTT. 4-Aminopyridine also significantly affected the cell cycle, which increased the percentage of cells in G0/G1, and reduced the percentage of cells in S phase and G2/M phase. Non-selective K⁺ channel blockers tetrapentylammonium (TPeA) and verapamil had similar inhibitory effects on A2780 cell proliferation and cell cycle. In contrast, iberiotoxin, a selective inhibitor of K_Ca channels, and glibenclamide, a potent inhibitor of K_ATP channels, had no effect on the cell proliferation and cell cycle of A2780. Moreover K⁺ channels inhibitor, TPeA and verapamil, can blocked Ca²⁺ influx in these cells.

Conclusion

Voltage-gated K⁺ channels play an important role in the proliferation and cell cycle of ovarian cancer cell. It is likely that the influence of Kv channels on A2780 cell proliferation and cell cycle is mediated by a Ca²⁺-dependent mechanism.