可吸收镁合金支架植入后犬冠状动脉C-反应蛋白、基质金属蛋白酶9和血管性血友病因子的表达

Effect of absorbable magnesium alloy stenting on expression of C-reactive protein, matrix metalloproteinase-9 and von Willebrand factor in dogs

背景:课题组前期研究从宏观角度验证了可吸收镁合金支架的生物安全性。目的:观察可吸收镁合金支架植入后局部血管组织C-反应蛋白、基质金属蛋白酶9及血管性血友病因子的表达情况,从分子表达水平深层次探讨镁合金支架的组织相容性及安全性。方法:将25枚可吸收镁合金支架植入25只防疫杂种犬冠状动脉前降支或左回旋支,未植入支架的5只犬冠状动脉作为正常对照组,支架植入后24 h、3 d、5 d、1周、1个月各处死动物5只,取支架植入后的血管标本做病理切片,应用免疫组织化学染色方法测定冠状动脉局部C-反应蛋白、基质金属蛋白酶9及血管性血友病因子的表达。结果与结论:与正常对照组比较,支架植入后不同时间点冠状动脉局部C-反应蛋白、基质金属蛋白酶9及血管性血友病因子阳性细胞数明显增多(P<0.01),A值显著升高(P<0.01);与支架植入24 h、3 d、5 d、1周比较,植入1个月后冠状动脉局部C-反应蛋白、基质金属蛋白酶9及血管性血友病因子阳性细胞数明显减少(P<0.01),A值显著降低(P<0.01)。结果表明可吸收镁合金支架植入后的组织炎症程度轻,持续时间短且无血栓形成,提示可吸收镁合金支架具有较好的组织相容性和安全性。

BACKGROUND：Our previous study have verified the biosafety of absorbable magnesium aloy stents from a macro perspective. OBJECTIVE：To study the expressions of C-reactive protein, matrix metaloproteinase-9 and von Wilebrand factor in local vascular tissue after magnesium aloy stenting, and to explore the histocompatibility and safety of magnesium aloy stents at the molecular expression level. METHODS：Twenty-five absorbable magnesium aloy stents were implanted into the left anterior descending artery or circumflex artery of 25 epidemic prevention mongrel dogs. Five dogs with no stenting served as control group. Five dogs were sacrificed respectively at 24 hours, 3 days, 5 days, 1 week, 1 month after stenting, and vascular specimens were taken for preparation of pathological sections. The expressions of C-reactive protein, matrix metaloproteinase-9 and von Wilebrand factor within the coronary artery wal were determined by immunohistochemical staining method. RESULTS AND CONCLUSION： Compared with the control group, the number of cels positive for C-reactive protein, matrix metaloproteinase-9 and von Wilebrand factor was significantly increased at different times after stenting （P 0.01）. The inflammatory reactions induced by absorbable magnesium aloy stents are slight and last for short time, which suggests that the absorbable magnesium aloy stents have good histocompatibility and safety.