Study on the Preventive and Therapeutic Effects of Xinmaitong Tablets on Model Rats with Atherosclerosis and Corresponding Mechanism / 中国药房

ABSTRACT

OBJECTIVE:To study the preventive and therapeutic effects of Xinmaitong tablets on model rats with atherosclero-sis (AS) and corresponding mechanism. METHODS:48 rats were randomized into normal group,model group,positive group (simvastatin tablets,2 mg/kg)and the groups of high,medium and low-dose(500,250,125 mg/kg)Xingmaitong tablets,with 8 rats in each group. The rats in all groups except for the normal group were fed high fat diets and given vitamin D3 ip for the estab-lishment of AS model. Meanwhile,the rats in the drug administration groups were given corresponding drugs ig,while those in the normal group and the model group were given normal saline ig,once a day,for 10 consecutive weeks. The levels of cholesterol (TC),triacylglycerol(TG),nitric oxide(NO)and endothelin 1(ET-1)in serum were determined. The pathological change of the aorta tissue was observed under the light microscope,and the size of the aortic atherosclerotic plaque and intima thickness were measured. RESULTS:Compared to the normal group,the rats in the model group had significantly higher levels of TC,TG and ET-1 in serum,a markedly larger aortic atherosclerotic plaque,remarkably thicker intima and much lower level of NO(P<0.01);and obvious aortic atherosclerotic plaque formation was found. Compared to the model group,the above-mentioned indexes of the rats in all drug groups all improved obviously (P<0.05 or P<0.01),except that the decrease in TC in serum of the rats in the group of low-dose Xinmaitong tablets was not significant,which were positively correlated with dose;and the aortic lesion in drug groups was found to be improved. CONCLUSIONS:Xinmaitong tablets have certain preventive and therapeutic effect on the model rats with AS by a mechanism which may be related to the reduction in lipid deposition and the size of an atherosclerotic plaque,the improvement in NO/ET balance and the alleviation of an endothelial injury.