高血脂兔髂-股动脉成形术后平滑肌细胞中c-myc和cdc2基因的表达

目的 :探讨 c- myc和 cdc2基因在高血脂兔髂 -股动脉成形术后平滑肌细胞中的表达。方法 :2 4只新西兰白兔均饲以高脂饲料 ,于高脂饲喂 2周时用球囊导管扩张髂 -股动脉 ,造成动脉内膜损伤 ,6～ 8周行血管造影检查 ,对狭窄 >5 0 %的动脉段行球囊扩张术 ,术后 2 4 h和 2周分别用 RT- PCR和免疫金银法检测 c- myc、cdc2 m RNA和相应蛋白质的表达。结果 :c- myc和 cdc2 m RNA在球囊扩张术后 2 4 h表达增加 ,其相应蛋白质在扩张术后 2周时表达增加 ,阳性颗粒主要位于新内膜层平滑肌细胞的胞核 ,少量位于胞质。结论 :动脉损伤后可致 c- myc、cdc2 m RNA和相应蛋白质表达增加 ,提示 c- myc和 cdc2表达增加在动脉损伤后平滑肌细胞增殖中起一定作用

Expression of c-myc and cdc2 gene in hypercholesterolemic rabbit following iliac-femoral angioplasty

Objective:To investigate the expression of c myc and cdc2 gene in iliac femoral arteries of rabbits fed with high cholesterol diet. Methods:Totally 24 New Zealand rabbits fed with high cholesterol and high lipid diet were chosen for the experiment. In treated groups,the iliac femoral arteries were dilated by balloon catheter in 2 week high lipid diet fed rabbits. After 6 8 weeks,angiography was performed to detect the stenosis in iliac femoral,and ballon dilation was carried out when stenosis beyond 50%. Expression of c myc and cdc2 mRNA (24 h following balloon dilation) and their proteins (2 weeks following balloon dilation) were measured by means of RT PCR and immunohistochemistry (GISS) methods. Results: Expressions of c myc,cdc2 mRNA and their proteins in dilated arteries were all increased 24 h and 2 weeks following balloon dilation. Immuno positive particles were mainly located at nuclei of SMC in neotima layer,and a little at cytoplasma. Conclusion: Expressions of c myc,cdc2 mRNA and their proteins are increased in arteries following angioplasty. It is indicated that c myc and cdc2 may play an important role in neointimal formation after angioplasty.