腹主动脉瘤血管平滑肌细胞凋亡和自噬研究

Apoptosis and autophagy of vascular smooth muscle cells of abdominal aortic aneurysm

目的探讨血管平滑肌细胞(SMC)凋亡和自噬与腹主动脉瘤(AAA)发病的关系。方法采用原位末端DNA标记(TUNEL)技术观察AAA和人正常主动脉组织中SMC凋亡的情况,并用免疫组织化学分析其中LC3的蛋白表达。提取AAA和正常主动脉组织RNA,采用RT-PCR方法检测其中与自噬相关的基因Beclin1、Atg4b、Bnip3、Vps34的表达。结果 AAA组织中凋亡的SMC明显高于正常主动脉组织(P<0.05);LC3蛋白在AAA中的表达高于正常主动脉组织(P<0.05);AAA中Beclin1、Atg4b、Bnip3、Vps34表达水平明显高于正常主动脉组织(P<0.05)。结论 SMC凋亡和自噬在AAA的发病中起重要作用。

Objective To investigate the relationship of apoptosis and autophagy of vascular smooth muscle cells （SMC） with the pathogenesis of abdominal aortic aneurysm （AAA）. Methods In situ terminal transferase-mediated dUTP nick end-labeling（TUNEL） was used to detect the apoptosis of SMC of AAA and human normal aorta. The expression of LC3 was measured by immunohistochemistry. RNA extraction from the tissue of AAA and human normal aorta was performed. The mRNA levels of autophagy-related genes Beclin1,Atg4b,Bnip3,and Vps34 are tested by RT-PCR. Results The number of TUNEL-positive SMC in AAA was higher than that in normal aorta （P0.05）. The expression level of LC3 protein was significantly increased in AAA compared with that in normal aorta （P0.05）. The mRNA expression levels of Beclin1,Atg4b,Bnip3 and Vps34 were markedly up-regulated in AAA compared with that in normal aorta （P0.05）. Conclusion The apoptosis and autophagy of vascular SMC play an important role in the pathogenesis of AAA.