曲尼司特对兔髂动脉损伤后内膜增殖及血管重构的影响

Effects of tranilast on neointimal proliferation and remodeling of rabbit iliac artery after balloon injury

目的 探讨曲尼司持对兔髂动脉球囊损伤后内膜增殖及血管重构的影响。方法 2 4只新西兰大白兔随机分为假手术组、对照组和用药组。用球囊导管对用药组和对照组兔行髂动脉损伤。用药组于术前 3d开始用曲尼司特 (每天 30 0mg/kg) ,术后 2 8d取病变血管苏木精 伊红和弹力纤维染色并免疫组化检查 ,以计算机图像分析血管内膜、中膜厚度、管腔面积、平均动脉面积 (外弹力膜内横截面积 ,EEL)的变化 ,计算增殖细胞核抗原 (PCNA)增殖指数 (PI)。结果 曲尼司特显著减少内膜厚度 ,增加血管腔面积和平均动脉面积 ,对中膜厚度无明显影响。曲尼司特使内膜PCNA阳性细胞百分比降低。结论 曲尼司特能抑制兔髂动脉球囊损伤后内膜增殖 ,促进代偿性血管扩张。

Objective To evaluate the effect of tranilast on neointimal proliferation and remodeling of rabbit iliac artery after balloon injury.Methods Twenty four rabbits were randomly divided into 3 groups including sham-operated group, control group, and treatment group. Balloon catheter was used to induce injury to the iliac artery of rabbits in control group and treatment group. Tranilast was given to the rabbits in treatment group (300 mg·kg -1) once a day from 3 days before operation to 28 days after operation, and then local vessels were harvested for pathological analysis and immunohistochemical staining. Automatic image analysis system was used to detect the changes of intimal thickness, medial thickness, luminal area, external elastic lamina (EEL) cross-sectional area and the proliferation index of proliferating cell nuclear antigen (PCNA). Results The intimal thickness was decreased in treatment group compared with control group. The luminal area and EEL cross-sectional area were significantly larger in treatment group than those in control group. No significant difference was found between treatment group and control group in medial thickness. The proliferation index of PCNA was significantly reduced in treatment group compared with control group. Conclusions Tranilast signifcantly inhibited neointimal hyperplasia and prompted compensatory artery dilation during remodeling of rabbit iliac artery after balloon injury. The effect on neointimal hyperplasia may be partly attributed to the inhibition of vascular smooth muscle cell proliferation.