急性心肌缺血再灌FOS免疫组织化学实验研究

探寻FOS蛋白在心肌早期缺血再灌流损伤中变化规律,为心性猝死的诊断提供新方法。利用SD大鼠建立心肌缺血再灌流损伤模型,设立正常、缺血对照组与缺血再灌组。心脏标本经HE染色及免疫级化观察。结果发现,在冷冻切片上缺血20min再灌流30min,再灌流区心肌细胞核呈阳性着色。但在石蜡切片上,缺血30min再灌流30min后,再灌流区才有心肌细胞核（37．76％±9．66％）呈弱阳性着色,再灌流60min后核呈棕褐色阳性染色,120min后开始减弱（35.36％±3.16％）。正常和单纯缺血组心肌细胞核未见有阳性反应。HE染色无明显病理改变。结果提示,SABC－FOS免疫组织化学方法最早可揭示心肌缺血20min再灌流30min的损伤,FOS蛋白在再灌流后60－120min之间可能有一个高峰表达。此法对显示实验性心肌早期缺血再灌流损伤有重要的价值。有望用于心性猝死的诊断。

Immunohistochemical study on myocardial acute ischemia reperfusion injury in rats with anti-FOS protein antibody

To investigate law of FOS protein induced by myocardial ischemia reperfusion (MI/R) in acute period, a model in 20 anaethetized SD rats was established. Rats with normal and ischemia were used as control groups. Specimens were studied immunohistochemically with c-fos antibody. After ischemia 20 minutes, followed by 30 minutes reperfusion, the area of MI/R showed nuclei of myocytes positive staining in cryosection slides. In C2 group, the area showed nuclei of myocytes (37.76% +/- 9.66%) positive staining weakly. In C3 group, nuclei of cardiac myocytes(40.34% +/- 3.32%) was significantly positive. In C4 group it began to attenuate(35.36% +/- 4.81%). The myocardium in normal and ischemic control groups showed negative staining. No changes were seen with HE staining. Our data indicated that immunohistochemical method may reveal acute MI/R injury of ischemia 20 min and reperfusion 30 min with anti-FOS protein staining and there is problely a peak between 60-120 min after reperfusion. It is possible that the method be used to diagnose sudden cardiac death in forensic medicine.