电针对内毒素引起大鼠肝损伤保护作用的研究

目的：观察电针足三里能否减轻内毒素引起的大鼠肝损伤,并初步探讨其作用机制。方法：雄性Wistar大鼠40只随机分为4组：内毒素组、电针组、正常组和非穴组。尾静脉注射内毒素（5 mg/kg）制作大鼠肝损伤模型,正常组注射等量生理盐水;电针组于造模半小时后给予电针“足三里”治疗（2～100 Hz,2 mA,1.5 h）,非穴组针刺位置为“足三里”旁开5 mm、下5 mm,操作同电针组。结果：尾静脉注射内毒素可显著增加大鼠肝组织TNF-α含量和血浆ALT活性,电针可使两者明显降低（P〈0.01）,非穴组大鼠肝组织TNF-α含量和血浆ALT活性与内毒素组相比差异无统计学意义（P〉0.05）。结论：电针“足三里”可降低内毒素引起的异常升高的大鼠肝组织TNF-α含量和血浆ALT活性,具有器官保护作用,其机制可能与降低肝组织TNF-α含量有关。

Study on protective action of electroacupuncture on endotoxin-induced hepatic in jury in rats

OBJECTIVE: To observe whether electroacupuncture (EA) at Zusanli (ST 36) reduces endotoxin-induced hepatic injury in rats and to explore the mechanism. METHODS: Forty male SD rats were randomly divided into 4 groups, a endotoxin group, an EA group, a normal group and a non-acupoint group. Hepatic injury rat model was prepared by injection of endotoxin (5 mg/kg) into the caudal vein, the normal group received the injection of the equal amount of saline; for the EA group, EA (2-100 Hz, 2 mA, 1.5 h) was given at "Zusanli" (ST 36) half an hour after modeling, and for the non-acupoint group, acupuncture was given at the point 5 mm lateral to and 5 mm below "Zusanli" (ST 36), and other treatments were as same as those in the EA group. RESULTS: Injection of endotoxin into the caudal vein could significantly increase TNF-alpha content in the liver and plasma ALT activity (P<0.01), which were decreased by EA (P<0.01) and were not significantly changed in the non-acupoint group (P>0.05). CONCLUSION: The abnormal increases of TNF-alpha content in the liver and plasma ALT activity induced by endotoxin can be decreased by EA at "Zusanli" (ST 36), protecting the organ, and the mechanism is possibly related with the decrease of TNF-alpha content in the liver.