大黄(庶虫)虫丸对动脉粥样硬化模型家兔血管平滑肌细胞的影响

目的:从血管平滑肌细胞(VSMC)增殖和凋亡、血管壁胶原合成等方面探讨大黄虫丸(熟大黄,土鳖虫,水蛭,黄芩等)抗动脉粥样硬化(AS)的机制。方法:采用免疫损伤合并高脂食饵的方法复制家兔早期AS模型,检测指标包括血管壁超微结构观察,血管壁羟脯氨酸含量测定;用免疫组化和TUNEL法分别测定血管壁VSMC的增殖和凋亡。结果:大黄虫丸使AS家兔血管壁中膜层厚度变小,VSMC排列趋于正常,减轻线粒体肿胀和粗面内质网扩张,减少细胞器的增多,使VSMC表型转化减轻,成纤维细胞和胶原纤维明显减少。大黄虫丸也能降低血管壁羟脯氨酸含量,降低PCNA染色阳性细胞数,升高TUNEL染色阳性细胞数。结论:大黄虫丸可抑制血管壁胶原的合成,抑制VSMC的增殖并促进其凋亡,进而逆转血管重塑,这可能是其抗AS的机制之一。

Effect of Dahuang Zhechong Pill on the vascular smooth muscle cell in atherosclerotic rabbits

AIM: To observe the anti-atherosclerotic mechanism of Dahuang Zhechong Pill(Radix et Rhizoma Rhei,Eupolyphaga seu steleophaga,Hirudo,Radix Scutellariae,etc) in the aspect of VSMC proliferation and apoptosis,collagen synthesis in the vessel wall. METHODS: The atherosclerotic model was established by hypercholesterol feeding together with immune-injured endothelium in rabbits.The level of hydroxyproline in vessel wall was determined.Histological changes were examined by electronic microscopes.The proliferation of VSMC was determined by immunohistochemistry and apoptosis of VSMC by TUNEL. RESULTS: Dahuang Zhechong Pill improved the histological changes of vessel wall of rabbit with atherosclerosis and reversed vascular remodelling.The level of hydroxyproline in the vessel wall and the number of proliferation of VSMC decreased,and the number of apoptosis of VSMC increased in Dahuang Zhechong Pill-administered groups compared with the model control group. CONCLUSION: Dahuang Zhechong Pill can inhibit the development of atherosclerosis by inhibiting the synthesis of collagen fiber in vessel wall and the proliferation of VSMC as well as inducing the apoptosis of VSMC.