【摘要】 目的探讨ET-1及内源性ECE对自体静脉移植术后内膜增生的作用。方法通过建立自体静脉移植模型,采用RT-PCR和免疫组织化学方法,从mRNA水平和蛋白质水平分析ECE和ET-1在移植静脉的表达及影响。结果移植术后6h,吻合口处中膜即出现PCNA阳性平滑肌细胞,并随着时间推移逐渐增高,在1～2周左右达到高峰。2周后,中膜PCNA阳性SMC开始逐渐减少,于术后8周趋于平稳。随着移植术后时间的推移,ET-1的表达与ECE的表达逐渐增高,手术后1～2周达到高峰,2周后表达逐渐下降,于8周左右趋于平衡,ET-1与ECE密切相关(r=0.975)。结论静脉内膜增生病理过程的发生时间和变化规律与ET-1和ECE表达的动态变化过程吻合,提示ECE参与移植静脉内膜的增殖过程。更多还原

【Abstract】 Objective To study the effet of ET-1 and ECE on endothelial proliferation of autografted vein.Methods An animal model of the autogenous vein graft was established in 80 Wistar rats.The expression of ECE and EF-1 gene was determined by RT-PCR and immunohistological method to test the mRNA and protein expresion level respectively.Results PCNA positive smooth muscle cells appeared 6 hours after transplantation,increased with time,and reached a peak at 1 to 2 weeks.After 2 weeks,PCNA positive SMC in the tunica media began to decline and recovered to the 6 hour level at 8 weeks after the operation.mRNA of ECE increased with the time after the operation,reached a peak after 1-2 weeks,declined afterwards,and became stable at around 8 weeks.Expression change of ET1 was similar to the change of ECE,reached the peak after 1-2 weeks and was stable after 8 weeks(r=0.975).Conclusions The time and pattern of change of the pathologic process of intimal hyperplasia are in agreement with the expression of ET-1 and ECE,and suggests that ECE is involved in the process of intimal hyperplasia of vein graft.更多还原