血府逐瘀汤对大鼠糖尿病性心肌病的影响

目的: 观察2型糖尿病心肌病大鼠心肌组织的病理改变以及血府逐瘀汤对于糖尿病性心肌病的治疗作用,探讨心肌病发生的病理机制。方法: 雄性Wistar大鼠42只,采用高脂高热量饮食诱导出胰岛素抵抗,加单次中等剂量(50 mg/kg)链脲佐菌素腹腔注射建立糖尿病动物模型。8周后采用心电图及超声心动图评价心肌受损情况;取血检测血糖、胆固醇、甘油三酯含量;心肌组织Masson染色定量左室心肌胶原纤维;TUNEL凋亡试剂盒检测心肌细胞凋亡,光镜和电镜观察心肌细胞结构破坏程度。结果: 与相同时点正常组比较,模型组血糖、甘油三酯、胆固醇含量升高(P<0.05),第11、14周左室收缩末期内径明显增厚(P<0.01),第14周左室舒张末期内径增厚(P<0.05),心肌组织结构破坏严重,胶原纤维含量增多(P<0.01),细胞凋亡增多;与相同时点模型组相比,血府逐瘀汤组大鼠血糖、胆固醇、甘油三酯明显降低(P<0.05),第11周左室收缩末期内径、第14周左室舒张末期内径增厚减低(P<0.05),第14周左室重量明显变轻(P<0.01),心肌组织破坏程度较轻,胶原纤维含量显著减少(P<0.01),心肌细胞亚细胞结构破坏程度较轻,细胞凋亡减少。结论: 糖尿病性心肌病时,血糖、胆固醇和甘油三酯含量升高,心肌增厚,心肌组织内胶原纤维含量增多,结构破坏严重,细胞凋亡增多;血府逐瘀汤能够降低糖尿病心肌病时血糖、胆固醇和甘油三酯水平,减轻心肌纤维化的病理改变程度,延缓糖尿病导致的心肌病进程。

Effect of Xuefuzhuyu decoction on cardiomyopathy in type 2 diabetic rats

AIM: To observe the pathologic changes of cardiomyopathy in type 2 diabetic rats and the therapeutic effect of Xuefuzhuyu decoction.METHODS: The diabetic model was established by feeding the animals with high-fat diet and injecting a middle dose of streptozotocin (50 mg/kg) intraperitoneally in 42 Wistar male rats. After 8 weeks, the damage of the heart in the model animals was detected by electrocardiogram and echocardiography, and the serum level of glucose, total cholesterol and triglyceride were determined by the methods of clinical chemistry. The content of collagen was quantified by Masson staining. The apoptosis of cardiomyocytes was measured by TUNEL apoptosis kit. The structures of myocardial damage were observed under light and electronic microscopes.RESULTS: (1) Compared with normal group at the same time points, the contents of serum glucose, triglyceride and cholesterol in model group increased (P<0.05). At the 11th and 14th weeks, the thickness of LVDS was significantly increased (P<0.01), the structure of myocardial tissues was severely damaged and collagen fiber content increased obviously (P<0.01). The cell apoptosis was also increased. (2) Compared with control group at the same time points, the contents of serum glucose, cholesterol and triglyceride in Xuefuzhuyu decoction group significantly decreased (P<0.05). The thickness of LVDS at the 11th and 14th weeks was decreased (P<0.05) and LVM at the 14th week became significantly thinner (P<0.01). The damage of the myocardium and subcellular structure was slighter and the content of collagen was lower than that in control group (P<0.05). The cell apoptosis was also attenuated.CONCLUSION: The levels of blood glucose, total cholesterol and triglyceride and the content of collagen fibers increase when diabetic cardiomyopathy develops, with more cell apoptosis and severe damage in the cardiac structure. Xuefuzhuyu decoction decreases the level of blood lipid in diabetic cardiomyopathy, alleviates the pathological changes of myocardial fibrosis and delays the progression of diabetic cardiomyopathy.