电针预处理对急性心肌缺血再灌注损伤大鼠小脑顶核及下丘脑外侧区c-fos蛋白表达的影响

目的:观察电针预处理对急性心肌缺血再灌注损伤(MIRI)大鼠小脑顶核(FN)与下丘脑外侧区(LHA)c-fos蛋白表达的影响,探讨FN和LHA在电针心经抗急性MIRI效应中的作用及机制.方法:将70只Sprague-Dawley大鼠随机分为假手术组、模型组、电针心经组和电针肺经组,每组14只;以及损毁LHA+电针心经组(简称LHA+电针心经组)和损毁FN+电针心经组(简称FN+电针心经组),每组7只.除假手术组外,其余5组采用冠状动脉左前降支结扎法建立急性MIRI大鼠模型.采用电针心经治疗的3组针刺神门和通里;电针肺经组针刺太渊和列缺.所有电针组于造模前接受电针刺激,电流强度1 mA,频率2 Hz,每次20 min,每日1次,共7 d.假手术组及模型组不予电针.监测大鼠心电图,分析ST段位移和心律失常评分.采用免疫组织化学法检测FN及LHA中c-fos蛋白的表达.结果:与假手术组比较,模型组大鼠ST段位移、心律失常评分以及FN和LHA的c-fos蛋白表达明显升高(均P<0.05).与模型组比较,电针心经组大鼠ST段位移、心律失常评分以及FN和LHA的c-fos蛋白表达明显降低(均P<0.05).与电针心经组比较,电针肺经组、LHA+电针心经组和FN+电针心经组大鼠ST段位移和心律失常评分明显升高(均P<0.05);电针肺经组及LHA+电针心经组大鼠FN的c-fos蛋白表达明显升高(均P<0.05);电针肺经组及FN+电针心经组LHA的c-fos蛋白阳性表达明显升高(均P<0.05).结论:FN和LHA参与了针刺心经改善急性MIRI效应的作用机制,小脑可能是通过小脑-下丘脑投射参与了针刺改善心脏功能的作用.

Effect of electroacupuncture pretreatment on the protein expression of c-fos in fastigial nucleus and lateral hypothalamus area in rats with acute myocardial ischemia-reperfusion injury

Objective:To observe the effect of electroacupuncture(EA)pretreatment on the protein expression of c-fos in fastigial nucleus(FN)and lateral hypothalamus area(LHA)in rats with acute myocardial ischemia-reperfusion injury(MIRI),and to explore the role and mechanism of FN and LHA in EA at the Heart Meridian fighting against acute MIRI reaction.Methods:Seventy Sprague-Dawley rats were randomly divided into a sham operation group,a model group,an EA-Heart Meridian group and an EA-Lung Meridian group,with 14 rats in each group;an LHA lesion plus EA-Heart Meridian group(LHA+EA-Heart Meridian group)and a FN lesion plus EA-Heart Meridian group(FN+EA-Heart Meridian group),with 7 rats in each group.Except the sham operation group,the left anterior descending branch of coronary artery was ligated to establish acute MIRI rat models in the other 5 groups.In the three groups with EA-Heart Meridian treatment,Shenmen(HT 7)and Tongli(HT 5)were selected;Taiyuan(LU 9)and Lieque(LU 7)were selected in the EA-Lung Meridian group.All the EA groups received EA stimulation prior to modeling,with 1 mA in current intensity and 2 Hz in frequency,20 min each time,once a day for a total of 7 d.The sham operation group and the model group did not receive EA stimulation.The electrocardiogram was observed in the rats to analyze the ST-segment deviation and cardiac arrhythmia score.The expression of c-fos protein in FN and LHA was detected by immunohistochemistry method.Results:Compared with the sham operation group,the ST-segment deviation,cardiac arrhythmia score and the expression of c-fos protein in the FN and LHA increased significantly in the model group(all P<0.05).Compared with the model group,the ST-segment deviation,cardiac arrhythmia score and the expression of c-fos protein in FN and LHA decreased significantly in the EA-Heart Meridian group(all P<0.05).Compared with the EA-Heart Meridian group,the ST-segment deviation and cardiac arrhythmia score increased significantly in the EA-Lung Meridian group,LHA+EA-Heart Meridian group and FN+EA-Heart Meridian group(all P<0.05);the expression of c-fos in FN increased significantly in the EA-Lung Meridian group and LHA+EA-Heart Meridian group(both P<0.05);the expression of c-fos in LHA increased significantly in the EA-Lung Meridian group and FN+EA-Heart Meridian group(both P<0.05).Conclusion:FN and LHA are involved in the mechanism of EA at Heart Meridian to improve the acute MIRI reactions,and the cerebellum may participate in the improvement of cardiac function by EA through the cerebellum-hypothalamus projection.