伊贝沙坦抑制兔心肌缺血/再灌注ICAM-1和VCAM-1的表达

 目的：探讨伊贝沙坦对兔心肌急性缺血/再灌注损伤和缺血/再灌注区细胞间粘附分子-1（ICAM-1）、血管内皮细胞粘附分子-1（VCAM-1）表达的影响。 方法： 假手术组，左冠状动脉前降支近端穿线，但不结扎；缺血再灌注组（IR组），缺血60 min再灌360 min和伊贝沙坦防治组。处死动物后，从再灌注区取组织、HE染色后，光镜下检查；用免疫组化SP方法检测ICAM-1、VCAM-1在标本组织中的表达。 结果： 与假手术组相比，IR组的组织损伤和中性粒细胞渗出程度明显重于假手术组（P<0.01）；再灌注区的ICAM-1、VCAM-1表达明显上调（P<0.01）。伊贝沙坦显著缓解上述变化（P<0.01）。 结论： 心肌急性缺血/再灌注诱导再灌注区ICAM-1、VCAM-1表达上调，伊贝沙坦能明显缓解心肌缺血/再灌注损伤。

Irbesartan suppresses expression of VCAM-1 and ICAM-1 in myocardial ischemia-reperfusion areas in rabbits

AIM: To investigate the effects of irbesartan on acute myocardial ischemia-reperfusion injury and on expression of ICAM-1 and VCAM-1 in myocardial ischemia-reperfusion areas in rabbits. METHODS: Anterior descending branch of left coronary artery (LAD) was ligated in ischemia-reperfusion (IR) group but not in the sham group. Rabbits of IR group were subjected to 60 min of LAD occlusion, and 360 min of reperfusion. In the treated group, the rabbits were given irbesartan until the trial ended. Then, all rabbits were killed and tissue samples were removed from IR areas. After disposed with routine histological methods and stained with hematoxylin and eosin (HE), these samples were examined by light microscopy. The expression of ICAM-1 and VCAM-1 were also investigated by employing immunohistochemical SP method in the tissue samples. RESULTS: Degree of damage in cardiocytes and of neutrophil infiltration were more serious in IR group than those in sham group (P<0.01). Expression of ICAM-1 and VCAM-1 in IR areas of the treated group was much less up-regulation than that in IR group (P<0.01). CONCLUSION: The expression of ICAM-1 and VCAM-1 in I/R areas is up-regulated in the IR group. Irbesartan effectively alleviates myocardial IR injury in rabbits.