NiTi放射性支架置入兔腹主动脉后对平滑肌细胞增殖和凋亡的影响

目的　观察NiTi放射性支架对平滑肌细胞增殖和凋亡的影响。方法　在 76只家兔腹主动脉中分别置入放射与非放射性支架。用免疫组化法和TUNEL法观察放射性支架对平滑肌细胞增殖和凋亡的影响。结果　 (1) 2周时放射与非放射性组新生内膜面积无显著差异 (P >0 0 5 ) ,1个月和 3个月时放射支架组新生内膜面积小于非放射性组 (P <0 0 1) ;(2 )PCNA法测定平滑肌细胞增殖显示放射性组在各时间点PCNA表达低于非放射性组 (P <0 0 5 ) ;(3)TUNEL法测定放射性组平滑肌细胞凋亡与对照组相比在 2周和 1个月时有显著差异 (P<0 0 5 ) ,在 3个月时两组平滑肌细胞凋亡无显著差异 (P >0 0 5 )。结论　 (1)放射性支架可减少支架置入术后支架内新生内膜面积。 (2 )放射性支架可抑制血管平滑肌细胞增殖。 (3)放射性支架促进血管平滑肌细胞凋亡

The proliferation and apoptosis of smooth muscle cells after implantation of NiTi radioactive stents in the rabbits'''' aortas

Objectives To investigate the proliferation and apoptosis of smooth muscle cells(SMCs) after implantation of NiTi radioactive stents. Methods Radioactive and nonradioactive stents were implanted in abdominal aortas of 76 rabbits.The proliferation and apoptosis of SMCs were observed using immunohistochemistry and TUNEL.Results (1) Neointima areas on radioactive stents were less than those on nonradioacvtive stents at 1-month and 3-month respectively (P<0 01),whereas there was no difference beween two groups at the end of the second week(P>0 05).(2)The expressions of PCNA were lower in radioactive stent groups at different times compared with those of controls(P<0 05).(3)The apoptosis of SMCs in radioactive stent groups was quite different at 2-week and 1-month from that in nonradioactive groups (P<0 05).However, there was no difference between the two groups at 3-month(P>0.05).Conclusions (1) Radioactive stents can reduce the neointima areas on the implanted stents.(2)Radioactive stents can inhibit the proliferation of SMCs.(3)Radioactive stents promote the apoptosis of SMCs.