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Docetaxel modulates the delayed rectifier potassium current (IK) and ATP-sensitive potassium current (IKATP) in human
Tao Sun1, Zhi-Guo Song, Da-Qing Jiang
1Department of Internal Oncology, Liaoning Cancer Hospital and Institute, Shenyang, 110042, China, jianong@126.com.
Abstract:
Ion channel expression and activity may be affected during tumor development and cancer growth. Activation of potassium (K(+)) channels in human breast cancer cells is reported to be involved in cell cycle progression. In this study, we investigated the effects of docetaxel on the delayed rectifier potassium current (I K) and the ATP-sensitive potassium current (I KATP) in two human breast cancer cell lines, MCF-7 and MDA-MB-435S, using the whole-cell patch-clamp technique. Our results show that docetaxel inhibited the I K and I KATP in both cell lines in a dose-dependent manner. Compared with the control at a potential of +60 mV, treatment with docetaxel at doses of 0.1, 1, 5, and 10 µM significantly decreased the I K in MCF-7 cells by 16.1 ± 3.5, 30.2 ± 5.2, 42.5 ± 4.3, and 46.4 ± 9% (n = 5, P < 0.05), respectively and also decreased the I KATP at +50 mV. Similar results were observed in MDA-MB-435S cells. The G-V curves showed no significant changes after treatment of either MCF-7 or MDA-MB-435S cells with 10 μM docetaxel. The datas indicate that the possible mechanisms of I K and I KATP inhibition by docetaxel may be responsible for its effect on the proliferation of human breast cancer cells.
Insights
Docetaxel significantly inhibits potassium currents (I K and I KATP) in human breast cancer cells. This docetaxel-induced ion channel modulation may contribute to its anti-cancer effects on cell proliferation.
Area of Science:
- Oncology
- Molecular Biology
- Electrophysiology
Background:
- Ion channel activity is altered during cancer development.
- Potassium (K(+)) channel activation influences breast cancer cell cycle progression.
Purpose of the Study:
- To investigate docetaxel's effects on delayed rectifier potassium current (I K) and ATP-sensitive potassium current (I KATP).
- To assess these effects in human breast cancer cell lines (MCF-7 and MDA-MB-435S).
Main Methods:
- Whole-cell patch-clamp technique was employed.
- Two human breast cancer cell lines (MCF-7, MDA-MB-435S) were used.
- Docetaxel was applied in a dose-dependent manner.
Main Results:
- Docetaxel inhibited both I K and I KATP in a dose-dependent manner in both cell lines.
- Significant decreases in I K were observed in MCF-7 cells at various docetaxel concentrations.
- No significant changes in G-V curves were noted after docetaxel treatment.
Conclusions:
- Docetaxel's inhibition of I K and I KATP may underlie its impact on human breast cancer cell proliferation.
- These findings suggest a potential mechanism for docetaxel's chemotherapeutic action.
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