目的 以整体和离体实验观察羟基红花黄色素A (HSYA)缓解心肌细胞凋亡的作用。方法 以异丙肾上腺素(ISO)造成大鼠急性心肌缺血,以TUNEL 法检测心肌组织细胞凋亡,免疫组化法和RT-PCR 法观察心肌组织中bax、bcl-2基因表达的变化;用缺糖缺氧/再复氧模型诱导原代培养心肌细胞凋亡,以PI 流式细胞法观察凋亡情况,以Rhodamine 123荧光法考察线粒体膜电位的变化。结果 60、120、240mg/kg HSYA ip 给药可以减轻心肌缺血大鼠的线粒体肿胀、核凝集及固缩,降低心肌细胞凋亡率(P<0.01),下调心肌组织Bax 蛋白(P<0.05)及bax mRNA 的表达(P<0.01)。0.64、1.3、2.5mmol/L HSYA 可减少缺氧/再复氧造成的细胞凋亡(P<0.05),且可缓解该损伤造成的心肌线粒体膜电位下降(P<0.05)。结论 抑制心肌细胞凋亡是HSYA 缓解心肌缺血的重要机制。

Objective To investigate the inhibitory effect of hydroxysafflor yellow A(HSYA) against cardiomyocyte apoptosis.Methods Rat myocardial apoptosis was induced by ip isoproterenol(ISO) and then HSYA was ip given to alleviate the apoptosis.Rat neonatal cardiomyocyte apoptosis was triggered by oxygen/glucose-deprivation/reperfusion(OGDR) injury.Cardiac tissue was observed by transmission electron microscopy(TEM) and cardiac cell apoptosis was assayed by terminal deoxynucleotidyl transferase dUTP nick-end labeling(TUNEL) staining.Bcl-2 and bax gene expression was observed by immunohistochemical staining and RT-PCR.The effect of HSYA to inhibit cardio myocyte apoptosis was assayed with the Flow Cyto Meter.Rhodamine 123 staining was used to measure the change of mitochondrial membrane potential.Results TEM showed that mitochondrion swelling and nucleus pyknosis were alleviated by HSYA treatment.It was shown by TUNEL staining that 60,120,or 240mg/kg HSYA decreased the apotosis rate of cardiomyocyte in rats with myocardial ischemia.In 120mg/kg HSYA-treated rats,Bax expression was downregulated compared with NS treated rats.In cultured OGDR cardiomyocytes,HSYA inhibited the decrease in mitochondrial membrane potential.Conclusion The mechanisms involved in the cardioprotective effect of HSYA are inhibition of cardiomyocyte apoptosis.

国家自然科学基金资助项目(30171146);北京市中医局科技资助项目(JJ-2006-26)