类肝素、阿司匹林、氯沙坦联合应用抗实验性血管内膜增生的研究

Effects of combined use of heparinoid,aspirin,and losartan on the experimental vascular intima hyperplasia in rats

目的 观察类肝素、阿司匹林、氯沙坦联合用药的抗血管内膜增生作用。方法 以挤压大鼠颈总动脉造成血管损伤 ,术后 2h ,观察血小板黏附、CT、TATFES、TXB2 水平。术后 14d ,以免疫组化观察血管壁PDGF、PCNA表达以及内膜 /中膜比值、内膜面积占有率。结果 类肝素、阿司匹林单用或联合应用 ,均显示延长CT、TATFES以及降低TXB2 水平 ,抑制血小板黏附 ,二药合用有相加作用。三类药物单用或两药合用均使PDGF B、PCNA表达下降 ,内膜 /中膜比值下降。三药合用对CT、TATFES、TXB2 作用未见加强 ,但PDGF B、PCNA表达及内膜 /中膜比值、内膜面积占有率进一步降低 ,与单药或两药合用差异有显著性 (P <0 0 1)。结论 类肝素、阿司匹林、氯沙坦联合应用对抑制内膜增生有互补、协同作用。

AIM To observe the effects of the combination of heparinoid, aspirin and losartan on the experimental vascular intima hyperplasia induced by squeezing carotid artery in rats. METHODS Rats except the normal control group were under operation after two days oral administration once a day. At the second hour after injury, blood coagulation time(CT), time of arterial thrombus formation by electrical stimulus(ATFTES) and the level of TXB_2 in plasma were measured. At the fourteenth day after the surgery, the following indexes were examined: intima/media ratio, intima area ratio, PDGF-B and PCNA immunohistochemistry in carotid artery. RESULTS CT, TATFES increased and the level of TXB_2 decreased in the groups of Hep, Asp and Hep+Asp. The PDGF-B content, the positive ratio of PCNA and the inti- ma/media ratio also decreased in the groups of Hep, Asp, Los, Hep+Asp, Hep+Los and Asp+Los. Compared with single drug or two drugs combination, PDGF-B, positive ratio of PCNA, intima/media ratio and intima area ratio decreased significantly in the group of three drugs combination( P <0.01), while the effects on CT, TATFES and level of TXB_2 were not significant. CONCLUSION The combination of heperinoid, aspirin and losartan had a complementary and cooperative effect on inhibiting the experimental vascular intima hyperplasia.