右美托咪定抑制HMGB1/TLR4/NF-κB信号通路减轻大鼠心肌缺血再灌注损伤研究
2021-05-06金莲锦胡春阳李罡刘岩李琳温立勇
金莲锦 胡春阳 李罡 刘岩 李琳 温立勇


【摘要】 目的:观察右美托咪定(Dex)对心肌缺血再灌注损伤大鼠心肌功能、炎症反应及HMGB1/TLR4/NF-κB信号通路的影响。方法:取75只成年SPF级10周龄雄性SD大鼠。运用可复性结扎LAD法建立心肌缺血再灌注损伤(MIRI)模型。随机均分为假手术组(Sham组)、Dex预处理+MIRI组(Dex组)、Dex+育亨宾+MIRI组(Dex/Yoh组)、育亨宾预处理+MIRI组(Yoh组)与MIRI组(I/R组),每组15只。比较各组心肌梗死面积(IS/AAR)。运用ELISA检测并比较各组心肌组织与血清TNF-α、IL-6水平。采用 Western blot检测并比较心肌组织HMGB1、TLR-4、MyD88、NF-κB蛋白表达情况。结果:Dex组、Dex/Yoh组、Yoh组及I/R组心肌组织与血清TNF-α、IL-6水平均高于Sham组,其中Dex组 【关键词】 右美托咪定 HMGB1/TLR4/NF-κB信号通路 心肌缺血再灌注损伤 [Abstract] Objective: To observe the effects of Dexmedetomidine (Dex) on myocardial function, inflammatory response and HMGB1/TLR4/NF-κB signaling pathway in rats with myocardial ischemia-reperfusion injury. Method: A total of 75 adult SPF 10-week-old male SD rats were selected. The model of myocardial ischemia reperfusion injury (MIRI) was established by using the repeatable ligation LAD method. They were randomly divided into Sham operation group (Sham group), Dex pretreatment+MIRI group (Dex group), Dex+Yohimbine+MIRI group (Dex/Yoh group), Yohimbine pretreatment+MIRI group (Yoh group) and MIRI group (I/R group), 15 rats in each group. The myocardial infarction area (IS/AAR) was compared in each group. The levels of TNF-α and IL-6 in myocardial tissue and serum were detected and compared by ELISA. The protein expressions of HMGB1, TLR-4, MyD88 and NF-κB in myocardial tissues were detected and compared by Western blot. Result: The levels of TNF-α and IL-6 in myocardial tissue and serum of the Dex group, Dex/Yoh group, Yoh group and I/R group were higher than those in the Sham group, and Dex group group NF-κB in myocardial tissues of Dex group, Dex/Yoh group, Yoh group and I/R group were higher than those in Sham group, and Dex group [Key words] Dexmedetomidine HMGB1/TLR4/NF-κB signaling pathway Myocardial ischemia-reperfusion injury First-authors address: Hongqi Hospital Affiliated to Mudanjiang Medical College, Mudanjiang 157011, China doi:10.3969/j.issn.1674-4985.2021.09.007 缺血性心肌病(ICM)属于一类心血管疾病,对人类健康造成了严重危害,死亡人数达到了每年700万以上,在全球范围内导致患者死亡的疾病中,ICM占有重要地位[1]。缺血心肌在恢复血液再灌注后,可导致心肌细胞出现不可逆损伤加重,即为心肌缺血再灌注损伤(MIRI)。相关研究指出,右美托咪定(Dex)可通过抑制心肌炎症反应来减轻再灌注损伤[2]。因此,本文研究了MIRI大鼠中Dex对心肌的保护作用及其机制,现报道如下。 1 材料与方法 1.1 材料 (1)实验动物:购买苏州西诺塞生物科技有限公司提供的成年SPF级10周龄雄性SD大鼠75只[使用许可证号:SCXK(苏)2013-0003],在恒温(22.0±2.0)℃的单笼中饲养,所有操作均在光照时间内进行,周期光照9:00~21:00,在笼上放置饲料、纯净水,让大鼠自由食用。(2)造模材料:购买江苏恒瑞医药股份有限公司生产的右美托咪定,美国Selleck公司生产的育亨宾,国药集团化学……
