尼可地尔后处理对心肌缺血-再灌注损伤大鼠心肌的保护作用

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文章编号] 1671-587Ⅹ(2012)06-1160-04[收稿日期] 2012-06-

13[基金项目] 吉林省卫生厅科研基金资助课题(2009z004

)[作者简介] 李悦玮(1975-),女,吉林省长春市人,讲师,在读医学博士,主要从事心血管疾病的基础和临床研究。[通信作者] 张科强(Tel:0431-88796754,E-mail:zhangkeqiang

@yahoo.com.cn)尼可地尔后处理对心肌缺血-再灌注损伤大鼠心肌的保护作用

李悦玮1,张文琪2,孙景辉1,张科强3

(1.吉林大学第一医院儿内五科,吉林长春130021;2.吉林大学中日联谊医院心内科,吉林长春130033;

3.吉林大学第二医院医务部,吉林长春130041

)[摘 要] 目的:观察尼可地尔后处理对心肌缺血-再灌注损伤(MIRI)大鼠心肌的保护作用,并探讨其作用机制。方法:26只SD大鼠随机分为对照组(8只)、盐酸异丙肾上腺素(ISO)组(8只)和尼可地尔后处理组

(10只)。对照组大鼠腹腔注射等量生理盐水,ISO组大鼠腹腔注射ISO 5mg·kg-1

,每隔24h重复注射1次,连续注射3d;尼可地尔后处理组于注射ISO 1h后尾静脉注射尼可地尔(1mg·kg-1

,每日1次,连续3d。于第3次注射ISO后24h断尾取血后处死,检测各组大鼠血清中乳酸脱氢酶(LDH)、磷酸激酸(CK)活性;常规HE染色观察各组大鼠心肌组织形态学表现;免疫组织化学染色法检测Caspase-3蛋白的表达;TUNEL法检测各组大鼠心肌细胞凋亡情况。结果:尼可地尔后处理组与对照组比较血清LDH和CK活性差异无统计学意义(P>0.05),但2组均低于ISO组(P<0.05)。HE染色,ISO组大鼠局部心肌组织变性坏死,伴有炎细胞浸润;尼可地尔后处理组大鼠坏死心肌细胞明显减少,炎症反应轻微;对照组大鼠心肌无异常表现。免疫组织化学染色,ISO组大鼠大量心肌细胞胞浆表达Caspase-3,对照组和尼可地尔后处理组大鼠Caspase-3无表达。尼可地尔后处理组细胞凋亡指数(AI)较ISO组明显降低(P<0.01)。结论:尼可地尔可减轻大鼠MIRI,其作用机制可能与抑制Casp

ase-3激活、减少细胞凋亡有关。[关键词] 心肌缺血-再灌注损伤;尼可地尔;缺血后处理;药物后处理;细胞凋亡[中图分类号] R542.2 [

文献标志码] AProtective effect of nicorandil postconditioning on myocardium ofrats with myocardial ischemia-reperfusion injury

LI Yue-wei 1,ZHANG Wen-qi 2,SUN Jing-hui 1,ZHANG Ke-qiang

(1.Department of Pediatrics,First Hospital,Jilin University,Chang

chun 130021,China;2.Department of Cardiology,China-Japan Union Hospital,Jilin University,Changchun 130033,China;3.Department of Medical Adminisitration,Second Hospital,Jilin University,Chang

chun 130041,China)Abstract:Objective To explore the protective effect of nicorandil postconditioning on myocardium of rats withmyocardial ischemia-reperfusion injury(MIRI)in rats and to discuss its mechanism.Methods 26SD rats weredivided into control group(n=8),isoproterenol(ISO)group(n=8)and nicorandil postconditioning 

group(n=10).The rats in ISO group were injected intraperitoneally 

with isoproterenol(5mg·kg-1

)at an interval of 24hfor 3d;the rats in control group only 

received an injection of same amount of saline;the rats in nicorandilpostconditioning group were injected intravenously with nicorandil(1mg·kg-1

)1hafter ISO injection once a day,lasting for 3d.The rats were killed 24hafter the third injection of ISO.The activities of serum creatine kinase(CK)and lactate dehydrogenase(LDH)of rats in various groups were detected;the histopathological changes ofmyocardium of rats in various groups were observed by routine HE staining;the expressions of Caspase-3proteinwere determined by immunohistochemistry;the apoptosis of cardiocytes of rats in various groups was analyzed by0

611第38卷 第6期

2012年11月吉 林 大 学 学 报 (医 学 版)

Journal of Jilin University(

Medicine Edition)Vol.38No.6 

Nov.2012

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