电针内关穴对压力负荷增加大鼠心肌胶原的影响

Influence of Electroacupuncture of Neiguan Point on Myocardial Collagen in Rats with Pressure Overload

[目的]探讨电针内关穴对压力负荷增加所引起大鼠心肌纤维化及心肌Ⅰ、Ⅲ型胶原改变的影响。[方法]大鼠随机分为假手术组、模型组、电针组和西药组,复制压力负荷增加大鼠模型,电针组针刺双侧内关穴,其他组分别接受不同的实验分组处理;观测各组大鼠左室质量指数(LVMI)、血压(BP),并采用放射免疫分析法检测血浆血管紧张素Ⅱ(AngⅡ)水平,免疫组化染色法观察心肌Ⅰ、Ⅲ型胶原的改变。[结果]模型组大鼠BP、LVMI、Ang Ⅱ水平和Ⅰ、Ⅲ型胶原表达均升高,与假手术组比较有显著性差异(均P<0.01);电针组、西药组大鼠BP、LVMI、AngⅡ水平和Ⅰ、Ⅲ型胶原表达均降低,与模型组比较均有显著性差异(P<0.05或P<0.01);两治疗组组间比较无显著性差异(P>0.05)。[结论]电针内关穴可有效防治压力负荷增加引起的心肌纤维化。

[Objective] To investigate the effect of electroacupuncture (EA) of Neiguan (PC6) poinl on rnyocardial fibrosis and myocardial contents of collagen type Ⅰ and type Ⅲ in rats with pressure overload. [ Methods ] Rats were randomized to four groups: pseudo-operation group ( group A), model group ( group B) , EA group ( group C) and western medicine group (group D). Pressure-overloaded rat models were established by restriction of abdominal aortic artery. Left ventricular mass index (LVMI) and blood pressure (BP) in the four groups were observed; the plasma level of angiotensin Ⅱ (Ang Ⅱ ) was detected by radioimmunoassay and myocardial contents of collagen type Ⅰ and type Ⅲ by immunohistochemical staining method. [Results] BP, LVMI, expression levels of Ang If and collagen type Ⅰ and type Ⅲ were increased in group B as compared with those in group A ( P < 0.01) ; the above parameters were decreased in groups C and D as compared with those in group B ( P < 0.05 or P < 0.01); the differences between group C and group D were insignificant (P>0.05) . [Conclusion] EA of Neiguan point is effective in preventing and treating myocardial fibrosis induced by pressure overload.