王立山李艳孙芹程洁高蓉△ 肖杭.脱氧鬼臼毒素对美洲大蠊背侧不成对中间神经元电压[J].现代生物医学进展英文版,2012,12(26):5020-5022. |
脱氧鬼臼毒素对美洲大蠊背侧不成对中间神经元电压 |
WANG Li-shan,LI Yan,SUN Qin,CHENG Jie,GAO Rong△,XIAO Hang |
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DOI: |
中文关键词: DOP DUM 电压依赖性钾电流 膜片钳 |
英文关键词: DOP DUM Voltage-gated potassium current Patch clamp |
基金项目:国家自然科学基金资助项目(81072329);江苏高校优势学科建设工程资助项目 |
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中文摘要: |
目的:探讨脱氧鬼臼毒素(DOP)对美洲大蠊背侧不成对中间神经元(DUM)电压依赖性钾电流IK的影响。方法:采用全细胞
膜片钳技术研究脱氧鬼臼毒素对美洲大蠊背侧不成对中间神经元电压依赖性钾电流的电流幅度,电流- 电压关系以及激活曲线
的影响。结果:DOP能够抑制电压依赖性钾通道电流的幅度,而且此抑制作用具有浓度依赖性(5、10、20、40 μmol/L)。DOP抑制
IK的半数抑制浓度(IC50)值为18.064 μmol/L。20 μmol/L DOP能使IK 的电流- 电压关系曲线下移,并能使IK的激活曲线向去极
化方向移动。结论:DOP对美洲大蠊背侧不成对中间神经元(DUM)电压依赖性钾电流具有抑制作用,这可能是其杀虫作用的机制
之一。 |
英文摘要: |
Objective: To investigate the effects of deoxypodophyllotoxin(DOP)on voltage-gated potassium current IK in Periplaneta
Americana Dorsal Unpaired Median (DUM) Neurons. Methods: IK was obtained in DUM neurons by the whole-cell patch clamp
technique,and the effects of deoxypodophyllotoxin on IK were observed. Results: Deoxypodophyllotoxin at the concentrations of 5,10,20,
40 μmol/L inhibited IK in DUM neurons cells significantly, with the IC50 value of 18.064 μmol/L.Current-voltage relationship curve
decreased obviously after adding 20 μmol/L DOP, and activation curve of IK shifted toward a depolarizing direction. Conclusion:
Deoxypodophyllotoxin has inhibitory effects on IK in Periplaneta Americana Dorsal Unpaired Median Neurons, which may be one
mechanism of its insecticidal effect. |
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