摘要
目的探讨长链非编码RNA(long non-coding RNA,lncRNA)肺腺癌转录子1(MALAT1)以及下游调控蛋白高迁移率族蛋白B1(High-mobility group protein box-1,HMGB1)在缺血后处理降低大鼠心肌缺血-再灌注损伤(ischemia/reperfusion injury,IRI)中的作用。方法将24只大鼠饲养7天后,随机分成3组:假手术(Sham)组、缺血再灌注(ischemia/reperfusion,IR)组、缺血后处理(ischemic post-conditioning,IPO)组。模型构建完毕24 h进行检测大鼠血清中心肌肌钙蛋白I(cTnI)和白介素6(IL-6)表达水平,取材检测大鼠心肌梗死面积,检测大鼠心肌组织中MALAT1转录表达水平的差异,HMGB1、Toll样受体4(Toll-like receptor4,TLR4)蛋白含量差异。结果与Sham组比较,IR、IPO组血清中cTnI、IL-6水平明显升高,心肌梗死面积明显增加,心肌组织中MALAT1表达水平显著上调,HMGB1、TLR4水平明显升高(P<0.05)。与IR组比较,IPO组cTnI浓度显著降低,心肌梗死面积显著减小,心肌组织中lncRNA-MALAT1相对表达量降低,HMGB1、TLR4蛋白含量降低(P<0.05)。结论及时的缺血后处理可有效减缓大鼠心肌缺血-再灌注的损伤程度,其相关机制可能与抑制MALAT1调节控制HMGB1、TLR4表达水平之间有一定的关联。
Objective To investigate the role of long chain non-coding RNA(lncRNA)lung adenocarcinoma transcript 1(MALAT1)and the downstream regulatory protein,high mobility group protein B1(HMGB1),in the alleviation of myocardial ischemia-reperfusion injury(MIRI)by ischemic post-treatment in rats.Methods After 7 days of acclimatisation,24 male SD rats were randomly divided into three groups:sham operation(Sham)group,ischemia-reperfusion(IR)group,and ischemia post-treatment(IPO)group.The serum levels of cardiac troponin I(cTnI)and interleukin 6(IL-6)were measured at 24 h after model construction,and the myocardial infarction area was detected by sampling;the differences in the expression of MALAT1,the protein content of HMGB1,and the protein content of Toll-like receptor 4(TLR4)were detected in the myocardial tissues of rats.Results Compared with the Sham group,the serum concentrations of cTnT and IL-6 in the IR and IPO groups were significantly higher,the myocardial infarction area was significantly larger,the relative expression of lncRNA-MALAT1 in myocardial tissues was significantly higher,and the protein contents of HMGB1 and TLR4 were significantly higher(P<0.05).Compared with the IR group,cTnI concentration in the IPO group was significantly reduced,myocardial infarction area was significantly reduced,relative expression of lncRNA-MALAT1 in myocardial tissue was reduced,and HMGB1 and TLR4 protein content was reduced(P<0.05).Conclusion Post-ischemic treatment can reduce the degree of myocardial ischemia-reperfusion injury in rats,and the mechanism may be related to the inhibition of lncRNA-MALAT1 and the regulation of downstream expression of HMGB1,TLR4 and IL-6.
作者
王高尚
WANG Gaoshang(Department of Cardiology,Zhengzhou Seventh People's Hospital,Zhengzhou 450017,China)
出处
《中国实验诊断学》
2024年第8期979-984,共6页
Chinese Journal of Laboratory Diagnosis
基金
河南省科技攻关联合共建项目(LHGJ20210752)。
