电针下合穴对急性胃黏膜损伤模型大鼠HMGB1及nAchR α7的对比研究

目的:观察分别电针急性胃黏膜损伤(AGML)模型大鼠胃、大肠、小肠、胆腑下合穴后对白介素-1β(IL-1β)、高迁移率族蛋白1(HMGB1)及烟碱型乙酰胆碱受体α7(nAchRα7)的影响,探讨干预足三里治疗胃腑病变是否存在相对特异性。方法:将60只健康SD大鼠随机分为空白组、模型组、足三里组、上巨虚组、下巨虚组及阳陵泉组共6组,每组10只,雌雄各半。除空白组外均采用WRS法诱导建立急性胃黏膜损伤大鼠模型,空白组常规饲养,模型组束缚于鼠板上30min/次,足三里、上巨虚、下巨虚及阳陵泉组分别针刺与组名相应的双侧穴位并接电子针疗仪(疏密波10Hz/50Hz,左侧接正极,右侧接负极,强度以大鼠后肢末端轻微抖动为宜)治疗30 min,每天1次,连续治疗10d后,取胃组织,肉眼观察胃黏膜损伤情况并评分,ELISA法检测血清IL-1β及组织HMGB1含量,Western blot法检测nAchRα7的表达。结果:(1)与模型组比较,余组胃黏膜损伤指数(UI)、血清IL-1β及胃组织HMGB1含量均较低,且胃组织nAchRα7表达均较高(P<0.05,P<0.01);(2)与足三里组比较,上巨虚、下巨虚、阳陵泉组胃组织UI及血清IL-1β和胃HMGB1水平均较高(P<0.05,P<0.01),且阳陵泉组nAchRα7表达明显偏低(P<0.01)。结论:(1)电针与消化系统相关的内腑下合穴均可通过IL-1β、HMGB1及nAchRα7等调节机体免疫应答、减轻炎性反应、降低黏膜损伤,实现对AGML模型大鼠的干预治疗作用;(2)对比可知:足三里组对AGML模型大鼠的总体干预效应优于其他组,部分说明足三里穴与对应胃腑之间存在相对特异性。

Effect of electroacupuncture at“ Zúsānlǐ”(足三里 ST 36) and other lower he-sea points on the expression of TNF-α and NF-κB of acute gastric mucosal lesion rats

Objective To contrastively observe the effect of electroacupuncture at lower he-sea points of stomach, large intestine, small intestine and gallbladder of acute gastric mucosal lesion（AGML） model rats on the expression of serum high mobility group protein B 1（HMGB 1）, tumor necrosis factor-α（TNF-α） and nuclear factor-κB（NF-κB） of gastric tissue, and to explore whether the lower he-sea points of stomach have relative specificity in treatment of stomach diseases. Methods Seventy healthy SD rats were randomly divided into seven groups, including control group, model group, ＂Zúsānlǐ＂（足三里 ST 36） group, ＂Shàngjùxū＂（上巨虚 ST 37） group, ＂Xiàjùxū＂（下巨虚 ST 39） group, ＂Yánglíngquán＂（阳陵泉 GB 34） group and ＂Chéngjīn＂（承筋 BL 56） group, with five male rats and five female rats in each group. Acute gastric mucosal lesion model was established by applying WRS method. After successful modeling and treatment for ten days, sampling was conducted, gastric mucosal lesion was observed visually and scored, the levels of serum HMGB 1 and gastric tissue TNF-α were detected by ELISA method, and the expression of NF-κB was detected by immunohistochemical method. Results①Compared with the model group, the levels of Ulcers and inflammation（UI） in gastric mucosal and serum HMGB1, and the expression of gastric tissue TNF-α and NF-κB in the four lower he-sea points groups reduced（P〈0.01 or P〈0.05）;② compared with ST 36 group, the levels of gastric mucosal UI and serum HMGB1, and the expression of gastric mucosal TNF-α and NF-κB in other treatment groups increased significantly, and the difference was statistically significant（P〈0.01 or P〈0.05）. Conclusion①Electroacupuncture at relevant lower he-sea points can inhibit the body＇s immune response, relieve inflammatory reaction and reduce mucosal lesion by regulating HMGB 1, TNF-α and NF-κB, so as to realize the intervention and treatment on AGML rats;② the total intervention effect in ST 36 group is superior to that in other groups, indicating partially that there is a relative specificity between ST 36 and stomach.