金丝桃素通过调控AMPK/Nrf2/HO-1信号通路减轻大鼠心肌缺血再灌注损伤  

Hypericin reduces myocardial ischemia-reperfusion injury in rats by modulating AMPK/Nrf2/HO-1 signaling pathway

作　　者：李慧慧 古丽妮尕尔·安外尔 高晓峰 王刚 包雅丽 张甜 迪娜·艾尼瓦尔 凌灿 孙湛 LI Huihui;Gulinigaer ANWER;GAO Xiaofeng;WANG Gang;BAO Yali;ZHANG Tian;Dina AINIWAR;LING Can;SUN Zhan(Department of Pathophysiology,School of Basic Medical Sciences,Xinjiang Medical University,Urumqi 830000,China;Key Laboratory of Molecular Biology of Endemic Diseases,Urumqi 830000,China)

机构地区：[1]新疆医科大学基础医学院病理生理学教研室,新疆乌鲁木齐830000 [2]新疆地方病分子生物学重点实验室,新疆乌鲁木齐830000

出　　处：《中国病理生理杂志》2024年第10期1882-1890,共9页Chinese Journal of Pathophysiology

基　　金：新疆维吾尔自治区自然科学基金杰出青年科学基金项目(No.2022D01E53);新疆维吾尔自治区天山创新团队计划项目(No.2024D14013)。

摘　　要：目的:探讨金丝桃素(hypericin,Hyp)对心肌缺血再灌注损伤(myocardial ischemia-reperfusion injury,MIRI)大鼠心脏的影响及其作用机制。方法:30只SPF级雄性SD大鼠随机分为5组:假手术组(sham组)、心肌缺血再灌注损伤组(MIRI组)、金丝桃素低剂量给药组(MIRI+L-Hyp组)、金丝桃素高剂量给药组(MIRI+H-Hyp组)以及阳性对照药物曲美他嗪(trimetazidine,TMZ)给药组(MIRI+TMZ组),每组6只。除假手术组,其余4组大鼠均采用结扎左冠状动脉前降支后再通法建立MIRI模型,通过监测心电图判断造模是否成功;利用超声心动图检测大鼠心功能;TTC染色检测大鼠心肌梗死面积;HE染色观察大鼠心肌形态学特征;应用生化试剂盒分别测定大鼠血清中乳酸脱氢酶(lactate dehydrogenase,LDH)、超氧化物歧化酶(superoxide dismutase,SOD)的活性以及丙二醛(malondialdehyde,MDA)的含量;应用ELISA试剂盒分别检测大鼠血清中心肌肌钙蛋白(cardiac troponin I,cTnI)和活性氧(reactive oxygen species,ROS)含量;Western blot测定大鼠心肌组织中腺苷酸激活蛋白激酶(AMP-activated protein kinase,AMPK)、p-AMPK、核因子E2相关因子2(nuclear factor E2-related factor 2,Nrf2)以及血红素加氧酶1(heme oxygenase-1,HO-1)蛋白表达水平。结果:与sham组相比,MIRI组大鼠心肌组织病理损伤加剧,心肌梗死面积增大,超声心动图显示左心室射血分数(left ventricular ejection fraction,LVEF)和左心室短轴缩短率(left ventricular fractional shortening,LVFS)降低,LDH活性、cTnI、MDA以及ROS含量均升高,SOD活性、p-AMPK、Nrf2、HO-1蛋白表达均显著降低(P<0.05);与MIRI组相比,金丝桃素低、高剂量给药组及阳性对照药物曲美他嗪组大鼠心肌组织病理损伤减轻及心肌组织梗死面积减少,LVEF及LVFS升高,血清中LDH活性、cTnI、MDA以及ROS含量降低,而SOD活性、p-AMPK、Nrf2、HO-1蛋白表达均升高(P<0.05)。结论:金丝桃素可减轻大鼠心肌缺血再灌注损伤,可能通过AIM:To investigate the effect of hypericin(Hyp)on the heart of rats with myocardial ischemia-reperfusion injury(MIRI),and to explore its mechanism.METHODS:Thirty SPF male SD rats were divided into 5 groups:sham group,MIRI group,low-dose Hyp(L-Hyp)group(MIRI+L-Hyp group),high-dose Hyp(H-Hyp)group(MIRI+H-Hyp group),and positive control trimetazidine(TMZ)group(MIRI+TMZ group),with 6 rats in each group.Apart from the sham group,the MIRI model was established by ligating the anterior descending branch of the left coronary artery and then recanalizing it in the remaining four groups of rats.The success of the modeling was determined by monitoring the electrocardiogram.We assessed the cardiac function in rats using echocardiography.TTC staining was employed to measure the area of myocardial infarction in rats,and HE staining was utilized to observe the morphological traits of rat myocardium.We assayed the activities of lactate dehydrogenase(LDH)and superoxide dismutase(SOD)and the levels of malondialdehyde(MDA)in rat serum using biochemical kits.ELISA kits were applied to assess the contents of cardiac troponin I(cTnI)and reactive oxygen species(ROS)in rat serum.Western blot analysis was perfomed to measure the protein expression levels of AMPK,p-AMPK,Nrf2,and HO-1 in rat myocardial tissues.RESULTS:The rats in MIRI group exhibited increased myocardial tissue injury,larger myocardial infarction areas,decreased left ventricular ejection fraction(LVEF),and reduced left ventricular fractional shortening(LVFS)compared with sham group,as shown by echocardiography.Additionally,there were increases in LDH activity,cTnI,MDA and ROS levels,along with significant decreases in SOD activity,and p-AMPK,Nrf2 and HO-1 protein levels(P<0.05).Compared with MIRI group,the rats in MIRI+L-Hyp,MIRI+H-Hyp and MIRI+TMZ groups showed decreased myocardial histopathological damage and reduced myocardial tissue infarction area,increased LVEF and LVFS,and lowered serum levels of LDH activity,cTnI,MDA and ROS,while SOD activity,p-AMPK,Nrf2 and HO-1

关 键 词：金丝桃素 心肌缺血再灌注损伤 氧化应激 AMPK/Nrf2/HO-1信号通路 

分 类 号：R542.2[医药卫生—心血管疾病] R285[医药卫生—内科学] R322.1[医药卫生—临床医学]