中国组织工程研究 ›› 2022, Vol. 26 ›› Issue (11): 1747-1751.doi: 10.12307/2022.361

• 组织构建实验造模 experimental modeling in tissue construction • 上一篇    下一篇

依那普利减轻肢体缺血-再灌注模型大鼠心肌损伤的作用机制

邢宏昶1,曹建平1,朱  静1,姚  鲲2   

  1. 1沈阳医学院附属中心医院麻醉科,辽宁省沈阳市   110024 ;2中国医科大学附属盛京医院血液科,辽宁省沈阳市   110021
  • 收稿日期:2020-11-19 修回日期:2020-11-21 接受日期:2021-01-07 出版日期:2022-04-18 发布日期:2021-12-11
  • 通讯作者: 姚鲲,博士,副主任医师,中国医科大学附属盛京医院血液科,辽宁省沈阳市 110021
  • 作者简介:邢宏昶,男,1975年生,辽宁省营口市人,汉族,硕士,主任医师,主要从事围术期器官保护研究。
  • 基金资助:
    辽宁省自然科学基金项目(2019-ZD-0325),项目负责人:邢宏昶;沈阳医学院科学基金项目(20181029),项目负责人:邢宏昶

Mechanism by which enalapril alleviates myocardial injury in a rat model of limb ischemia-reperfusion

Xing Hongchang1, Cao Jianping1, Zhu Jing1, Yao Kun2   

  1. 1Department of Anesthesiology, Central Hospital of Shenyang Medical College, Shenyang 110024, Liaoning Province, China; 2Department of Hematology, Shengjing Hospital Affiliated to China Medical University, Shenyang 110021, Liaoning Province, China
  • Received:2020-11-19 Revised:2020-11-21 Accepted:2021-01-07 Online:2022-04-18 Published:2021-12-11
  • Contact: Yao Kun, MD, Associate chief physician, Department of Hematology, Shengjing Hospital Affiliated to China Medical University, Shenyang 110021, Liaoning Province, China
  • About author:Xing Hongchang, Master, Chief physician, Department of Anesthesiology, Central Hospital of Shenyang Medical College, Shenyang 110024, Liaoning Province, China
  • Supported by:
    Liaoning Provincial Natural Science Foundation Project, No. 2019-ZD-0325 (to XHC); Science Foundation Project of Shenyang Medical College, No. 20181029 (to XHC)

摘要:

文题释义:
肢体缺血再灌注损伤:是指组织器官缺血一段时间后,重新恢复血流灌注时组织器官的损伤程度不但没有减轻反而较缺血时不断加重,机体功能进一步恶化的综合征,是一种临床上常见的、多发生于严重创伤后的复杂病理过程。肢体缺血再灌注损伤的病理机制至今仍未完全阐明,目前医学界多认为其与脂质过氧化及氧自由基损伤、钙离子代谢紊乱、细胞凋亡、炎症反应损害等有关。
细胞信号传导通路:人体细胞之间的信息转导可通过相邻细胞的直接接触来实现,但更重要也是更为普遍的则是通过细胞分泌各种化学物质来调节自身和其他细胞的代谢和功能,因此在人体中,信息传导通路通常是由分泌释放信息物质的特定细胞、信息物质(包含细胞间与细胞内的信息物质和运载体、运输路径等)以及靶细胞(包含特异受体等)等构成。

背景:有研究证实依那普利可以减轻肢体缺血再灌注导致的心肌损伤,但对其作用机制的研究还没有报道。
目的:探讨依那普利减轻大鼠肢体缺血-再灌注心肌损伤的作用机制。 
方法:健康成年雄性SD大鼠48只随机分为对照组、模型组、依那普利组和抑制剂组。除对照组外,其余各组采用橡皮带环绕结扎大鼠双后肢根部3 h、再灌注3 h制备肢体缺血再灌注模型;抑制剂组再灌注前30 min时静脉注射PI3K抑制剂LY294002 0.3 mg/kg,依那普利组和抑制剂组再灌注即刻开始静脉输注依那普利13 μg/(kg•h)至再灌注结束;其余两组再灌注即刻开始给予等量生理盐水溶液。再灌注3 h时麻醉下处死大鼠,取心肌组织,检测心肌组织病理学改变、心肌组织细胞凋亡指数及凋亡基因表达、细胞传导通路蛋白表达。实验方案由沈阳医学院实验动物伦理委员会于2019年10月批准,批准号:研伦审第(2019)85号。
结果与结论:①光镜下与模型组比较,依那普利组心肌组织病理学损伤减轻;与依那普利组比较,抑制剂组心肌组织病理学损伤加重;②与模型组比较,依那普利组心肌组织细胞凋亡指数降低,Bax蛋白表达下调,PI3K、p-Akt和Bcl-2蛋白表达上调(P < 0.05);③与依那普利组比较,抑制剂组心肌组织细胞凋亡指数升高,Bax蛋白表达上调,PI3K、p-Akt和Bcl-2蛋白表达下调(P < 0.05);④结果说明,依那普利可通过激活PI3K/Akt信号通路,抑制细胞凋亡,减轻大鼠肢体缺血-再灌注心肌损伤。
缩略语:磷脂酰肌醇3-激酶:phosphatidylinositol-3-kinases,PI3K;蛋白质丝氨酸苏氨酸激酶:protein-serine-threonine kinase,Akt

https://orcid.org/0000-0001-7830-0511 (邢宏昶) 

中国组织工程研究杂志出版内容重点:组织构建;骨细胞;软骨细胞;细胞培养;成纤维细胞;血管内皮细胞;骨质疏松;组织工程

关键词: 依那普利, 再灌注损伤, 心肌, 1-磷脂酰肌醇3-激酶, 蛋白质丝氨酸苏氨酸激酶, 细胞凋亡, 炎症, 氧化应激

Abstract: BACKGROUND: Studies have confirmed that enalapril can alleviate myocardial injury caused by limb ischemia-reperfusion, but the mechanism of its action has not been reported.
OBJECTIVE: To investigate the effect mechanism of enalapril reduction of myocardial injury by ischemia-reperfusion in the rat limb. 
METHODS: Forty-eight healthy adult male Sprague-Dawley rats were randomly divided into control group, model group, enalapril group and inhibitor group. Except for the normal control group, rats were bundled around the ligation of the posterior limbs with a rubber band for 3 hours, followed by 3-hour reperfusion to establish the model of limb ischemia-reperfusion. Intravenous injection of 0.3 mg/kg LY294002 was given in the inhibitor group 30 minutes before reperfusion. Enalapril group and inhibitor group were given intravenous infusion of enalapril 13 μg/kg/h immediately after reperfusion until the end of reperfusion. An equal amount of normal saline solution was given in the other two groups immediately after reperfusion. After 3 hours of reperfusion, the rats were killed and the myocardial tissue was taken. Myocardial histopathological changes, apoptotic index, apoptosis gene expression and cell conduction pathway protein expression were detected. The study was approved by the Laboratory Animal Ethical Committee of Shenyang Medical College in October 2019 with an approval No. (2019)85.
RESULTS AND CONCLUSION: Compared with the model group, myocardial histopathological injury was reduced in the enalapril group. Compared with the enalapril group, myocardial histopathological injury was aggravated in the inhibitor group. Compared with the model group, myocardial apoptosis index (AI) was decreased, Bax expression was downregulated, PI3K, p-Akt and Bcl-2 expression was up-regulated in the enalapril group (P < 0.05). Compared with the enalapril group, myocardial apoptosis index was increased, Bax expression was up-regulated, PI3K, p-Akt and Bcl-2 expression was downregulated in the inhibitor group    (P < 0.05). The mechanism by which enalapril reduces limb ischemia-reperfusion caused myocardial injury is related to activating PI3K/Akt signaling pathway and inhibiting cell apoptosis in rats.

Key words: enalapril, reperfusion injury, myocardium, 1-phosphatidylinositol 3-kinase, protein-serine-threonine kinases, cell apoptosis, inflammation, oxidative stress

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