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咖啡因对急性分离的大鼠背根神经节细胞H-电流的影响

Effect of caffeine on hyperpolarization-activated current in acutely isolated rat dorsal root ganglion neurons
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摘要 目的 探讨咖啡因在镇痛中的作用机制。方法 应用膜片钳技术研究了咖啡因对大鼠的 3种不同直径大小的背根神经节 (DRG)细胞H 电流特性的影响。结果  5 .0mmol·L- 1咖啡因对DRG大细胞、中细胞和小细胞的H 电流分别降低了 (80±4 ) % ,(4 0± 3) %和 (11.0± 2 .3) %。结论 咖啡因使H 通道的电压敏感性下降 ,H 通道的激活电压升高。咖啡因对大型和中型DRG细胞H 电流的抑制作用 。 AIM To understand mechanisms of caffeine in antinociception and as an adjuvant analgesic. METHODS The effect of caffeine on slowly activating inward currents(I h) in small , medium , large diameter acutely isolated rat dorsal root ganglion neurons (DRG) was studied by using whole cell patch clamp technique. RESULTS Five mmol·L -1 caffeine suppressed the I h amplitude by (11.0±2.3)%, (40±3)% , (80±4)%, respectively, in small , medium and large diameter DRG neurons respectively, and decreased the sensitivity of I h. CONCLUSION The suppression of caffeine on I h of medium and large diameter cells may be one of the mechanisms acting as an adjuvant analgesic.
出处 《中国药理学与毒理学杂志》 CAS CSCD 北大核心 2003年第4期241-245,共5页 Chinese Journal of Pharmacology and Toxicology
基金 国家自然科学基金 ( 30 170 80 9 30 0 0 0 0 39) 国家973项目(200 2CB5 12 90 7) 中国科学院创新项目基金(KZCX 2410) 高等教育博士点研究基金 (2 0 0 2 0 35 80 5 3) 中国科学与技术大学基金 (KB0 833 KY12 0 6 )~~
关键词 咖啡因 神经节 H-电流 膜片钳技术 全细胞 caffeine ganglia, spinal slowly activating inward currents patch clamp technique, whole cell
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参考文献17

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