摘要
目的探讨2型糖尿病大鼠缺血预处理(IPC)对心肌缺血再灌注损伤(MIRI)的保护作用是否受到糖尿病心肌纤维化的影响。方法建立2型糖尿病大鼠模型,采用随机数字表法将54只正常大鼠和54只糖尿病大鼠各分成3组(n=18):(1)空白对照组(C组);(2)缺血再灌注损伤(IRI)对照组(IRI组);(3)IPC组;(4)糖尿病空白对照组(DC组);(5)糖尿病IRI对照组(DIRI组);(6)糖尿病IPC组(DIPC组)。再灌注结束时采集各组大鼠静脉血,采用酶联免疫法(ELISA)检测血清肌酸激酶心肌型同工酶(CK-MB)和心肌肌钙蛋白I(cTnI)水平;采用Evan′s蓝和氯化三苯基四氮唑(TTC)双染法测定心肌梗死面积(IS);采用Masson染色计算血管周围纤维化指数(PVCA)和心肌组织胶原容积分数(CVF)。结果本研究建立了稳定有效的长病程2型糖尿病大鼠模型;和正常组大鼠相比,糖尿病组大鼠相同处理组左心室心肌组织CVF和PVCA均显著升高(均P<0.05)。正常组大鼠组内比较,IRI组CK-MB、cTnI水平和IS分别为(12.3±1.1)ng/ml、(1.2±0.3)ng/ml、(52.3±8.1)%,IPC组分别为(6.6±0.8)ng/ml、(0.5±0.1)ng/ml、(25.1±4.7)%,明显降低(均P<0.05)。糖尿病组大鼠组内比较,DIRI组CK-MB、cTnI水平分别为(16.6±2.2)、(1.4±0.3)ng/ml,DIPC组分别为(11.5±0.9)、(1.1±0.1)ng/ml,明显降低(均P<0.05)。与IPC组相比,DIPC组cTnI、CK-MB浓度和IS均明显升高(均P<0.05)。结论长病程的2型糖尿病大鼠存在心肌纤维化,这种心肌纤维化减弱IPC对糖尿病MIRI的保护作用。
Objective To assess whether myocardial fibrosis affects the protective efficiency of ischemic preconditioning(IPC)against myocardial ischemia/reperfusion injury(MIRI)in type 2 diabetic rats.Methods Type 2 diabetic rat model was established.Fifty-four normal and 54 diabetic spragus-dawley(SD)rats were equally divided into 6 groups(n=18)using the random number table method:(1)Control group(C group);(2)Ischemia reperfusion injury(IRI)control group(IRI group);(3)IPC group;(4)Diabetic control group(DC group);(5)Diabetic IRI group(DIRI group);(6)Diabetic IPC group(DIPC group).After the reperfusion,blood samples were obtained for measuring serum concentrations of creatine kinase-MB(CK-MB)and cardiac troponin I(cTnI)using enzyme-linked immunosorbent assay(ELISA).The myocardial infarction size(IS)was assessed by double staining method with Evan′s blue and Triphenyl tetrazolium chloride(TTC),and the myocardial collagen volume fraction(CVF)and perivascular collagen area(PVCA)were assessed by Masson staining.Results A stable and effective rat model with long-term diabetes was established in the current study.Compared with the normal rat groups,the CVF and PVCA significantly increased(all P<0.05)in the diabetic rat groups.The levels of CK-MB,cTnI and IS in the IPC group were(6.6±0.8)ng/ml,(0.5±0.1)ng/ml and(25.1±4.7)%,which showed significant decrease compared with(12.3±1.1)ng/ml,(1.2±0.3)ng/ml and(52.3±8.1)%in IRI group(all P<0.05).Among the diabetic rat groups,the CK-MB and cTnI levels in DIPC group were(11.5±0.9)and(1.1±0.1)ng/ml,apparently lower than the levels of(16.6±2.2)and(1.4±0.3)ng/ml in the DIRI group(both P<0.05).Compared with the IPC group,the IS,CK-MB and cTnI levels significantly increased in the DIPC group(all P<0.05).Conclusion Myocardial fibrosis exists in rats with long-term type 2 diabetes,which weakens the protective effect of IPC on diabetes MIRI.
作者
阎涛
朱倩梅
李慧娴
王太行
张国华
孙莉
Yan Tao;Zhu Qianmei;Li Huixian;Wang Taihang;Zhang Guohua;Sun Li(Department of Anesthesiology,National Cancer Center,National Clinical Research Center for Cancer,Cancer Hospital,Chinese Academy of Medical Sciences and Peking Union Medical College,Beijing 100021,China;Department of Anesthesiology,National Cancer Center,National Clinical Research Center for Cancer,Cancer Hospital&Shenzhen Hospital,Chinese Academy of Medical Sciences and Peking Union Medical College,Shenzhen 518100,China)
出处
《中华医学杂志》
CAS
CSCD
北大核心
2021年第47期3857-3863,共7页
National Medical Journal of China
基金
深圳市“医疗卫生三名工程”项目(SZSM201812069)。
关键词
大鼠
糖尿病
心肌纤维化
心肌缺血再灌注损伤
缺血预处理
Rats
Diabetes mellitus
Myocardial fibrosis
Myocardial ischemia-reperfusion injury
Ischemic preconditioning