吉林大学学报(医学版) ›› 2021, Vol. 47 ›› Issue (1): 102-109.doi: 10.13481/j.1671-587x.20210114

• 基础研究 • 上一篇    下一篇

西红花苷对大鼠缺血缺氧心肌损伤的保护作用及其机制

黄建成,郭世超,刘璞娟,董彦博,李红英,吕瑛()   

  1. 河北医科大学第一医院心脏外科,河北 石家庄 050031
  • 收稿日期:2020-03-31 出版日期:2021-01-28 发布日期:2021-01-27
  • 通讯作者: 吕瑛 E-mail:jianchengj121@sina.com
  • 作者简介:黄建成(1980-),男,吉林省榆树市人,副主任医师,医学硕士,主要从事心血管基础和临床方面的研究。
  • 基金资助:
    河北省卫计委医学科学研究重点项目(20170522)

Protective effect of crocin on myocardium injury induced by ischemia and hypoxia in rats and its mechanism

Jiancheng HUANG,Shichao GUO,Pujuan LIU,Yanbo DONG,Hongying LI,Ying LYU()   

  1. Department of Cardiac Surgery,First Hospital,Hebei Medical University,Shijiazhuang 050031,China
  • Received:2020-03-31 Online:2021-01-28 Published:2021-01-27
  • Contact: Ying LYU E-mail:jianchengj121@sina.com

摘要: 目的

探讨西红花苷对大鼠缺血缺氧心肌损伤的保护作用,并阐明其作用机制。

方法

50只SD大鼠随机分为假手术组、模型组、低剂量(20 mg·kg-1)西红花苷组、中剂量(40 mg·kg-1)西红花苷组和高剂量(80 mg·kg-1)西红花苷组,每组10只。通过结扎左冠状动脉前降支再灌注建立大鼠缺血缺氧心肌损伤模型。采用HE染色观察大鼠心肌组织形态表现,原位末端标记(TUNEL)法检测心肌细胞凋亡情况并计算细胞凋亡指数(AI),逆转录-聚合酶链式反应(RT-PCR)和Western blotting法检测大鼠心肌组织中B细胞淋巴瘤-2(Bcl-2)、Bcl-2相关X蛋白(Bax)和天冬氨酸特异性半胱氨酸蛋白酶3(caspase-3)mRNA及蛋白表达水平,采用试剂盒检测各组大鼠血清中丙二醛(MDA)水平及超氧化物歧化酶(SOD)、乳酸脱氢酶(LDH)和肌酸激酶(CK)活性。

结果

假手术组大鼠心肌纤维排列整齐;模型组大鼠心肌纤维紊乱、出现水肿,心肌间质大量炎细胞浸润;与模型组比较,低剂量西红花苷组大鼠心肌组织中炎细胞浸润和心肌纤维水肿程度明显减轻,中和高剂量西红花苷组大鼠心肌纤维无明显水肿,少量炎细胞浸润。与假手术组比较,模型组大鼠心肌AI明显升高(P<0.05),心肌组织中Bcl-2 mRNA及蛋白表达水平明显降低(P<0.05),Bax和caspase-3 mRNA及蛋白表达水平明显升高(P<0.05),血清中MDA水平明显升高(P<0.05),SOD活性明显降低(P<0.05),LDH和CK活性明显升高(P<0.05);与模型组比较,低、中和高剂量西红花苷组大鼠心肌AI明显降低(P<0.05),心肌组织中Bcl-2 mRNA及蛋白表达水平明显升高(P<0.05),Bax和caspase-3 mRNA及蛋白表达水平明显降低(P<0.05),血清中MDA水平明显降低(P<0.05),SOD活性明显升高(P<0.05),LDH和CK活性明显降低(P<0.05);与低剂量西红花苷组比较,中和高剂量西红花苷组大鼠心肌AI明显降低(P<0.05),心肌组织中Bcl-2 mRNA及蛋白表达水平明显升高(P<0.05),Bax和caspase-3 mRNA及蛋白表达水平明显降低(P<0.05),血清中MDA水平及SOD、LDH和CK活性差异无统计学意义(P>0.05);与中剂量西红花苷组比较,高剂量西红花苷组大鼠心肌AI明显降低(P<0.05),心肌组织中Bcl-2 mRNA和蛋白表达水平明显升高(P<0.05),Bax和caspase-3 mRNA及蛋白表达水平明显降低(P<0.05),血清中MDA水平及SOD、LDH和CK活性差异无统计学意义(P>0.05)。

结论

不同剂量西红花苷对缺血缺氧心肌损伤具有保护作用,且具有剂量依赖性,其作用机制可能与减少心肌细胞凋亡及缓解心肌组织氧化应激损伤有关。

关键词: 西红花苷, 缺血缺氧, 心肌损伤, B细胞淋巴瘤-2, 天冬氨酸特异性半胱氨酸蛋白酶3

Abstract: Objective

To investigate the protective effect of crocin on the myocardium injury induced by ischemia and hypoxia of the rats, and to analyze its mechanism.

Methods

A totol of 50 SD rats were randomly divided into sham operation group, model group, low dose (20 mg·kg-1) of crocin group, medium dose (40 mg·kg-1)of crocin group and high dose (80 mg·kg-1) of crocin group, with 10 rats in each group. The myocardial ischemia reperfusion injury rat models were established by ligation of left anterior descending coronary artery and reperfusion. The morphology of myocardium tissue of rats in various groups was observed by HE staining. TUNEL was used to detect the apoptosis of myocardial cells, and the apoptotic index (AI) was calculated. The expression levels of B-cell lymphoma-2(Bcl-2), Bcl-2 associated X protein(Bax) and caspase-3 mRNA and proteins in myocardium tissue of the rats were determined by RT-PCR and Western blotting methods. The levels of malondialdehyde (MDA) and the activities of superoxide dismutase (SOD), lactate dehydrogenase (LDH), and creatine kinase (CK) in myocardium tissue of the rats in various groups were detected with detection kits.

Results

The myocardial fibers of the rats in sham operation group were arranged neatly; the myocardial fibers of the rats in model group were disordered, edema occurred, and the inflammatory cells were abundant in myocardial stroma;compared with model group, the inflammation and infiltration of the rats in low dose of crocin group were significantly reduced, and the myocardial fiber edema was significantly reduced; there was no significant edema of myocardial fibers with little inflammatory infiltration in medium and high doses of crocin groups. Compared with sham operation group, the AI of myocardium of the rats in model group was increased (P<0.05),the expression levels of Bcl-2 mRNA and protein in myocardium tissue of the rats in model group were significantly decreased (P<0.05), the expression levels of Bax and caspase-3 mRNA and proteins were significantly increased (P<0.05), the serum MDA level was significantly increased (P<0.05),the SOD activity was significantly decreased (P<0.05), and the LDH and CK activities were significantly increased (P<0.05). Compared with model group, the AI of myocardium of the rats in low, medium and high doses of crocin groups were significantly decreased (P<0.05),the expression levels of Bcl-2 mRNA and protein in myocardium tissue of the rats were significantly increased (P<0.05), the expression levels of Bax and caspase-3 mRNA and protein were significantly decreased(P<0.05), the serum MDA levels were significantly decreased (P<0.05), the SOD activities were significantly increased (P<0.05),and the LDH and CK activities were significantly decreased (P<0.05). Compared with low dose of crocin group, the AI of myocardium of the rats in medium and high doses of crocin groups were significantly decreased(P<0.05), the expression levels of Bcl-2 mRNA and protein in myocardium tissue were significantly increased (P<0.05), the expression levels of Bax and caspase-3 mRNA and proteins were significantly decreased(P<0.05), and the MDA levels and the activities of SOD, LDH and CK in serum had no significant differences(P>0.05). Compared with medium dose of crocin group, the expression levels of Bcl-2 mRNA and protein in myocardial tissue were significantly increased (P<0.05),the expression levels of Bax and caspase-3 mRNA and proteins were significantly decreased(P<0.05), the AI of myocardium of the rats in high dose of crocin group was significantly decreased (P<0.05), and the MDA level and the activities of SOD,LDH and CK in serum had no significant differences(P>0.05).

Conclusion

Different doses of crocin have protective effects on myocardial injury caused by ischemia and hypoxia in a dose-dependent manner, and its mechanism may be related to reducing the apoptosis of myocardial cells, and relieving myocardial oxidative stress injury.

Key words: anthocyanin, ischemia-hypoxia, myocardial injury, B-cell lymphoma-2, cysteine-containing aspartate-specific proteases-3

中图分类号: 

  • R285.5