早期脑利钠肽后处理对心肌缺血再灌注损伤和高迁移率族蛋白1表达的影响
2015-10-21黄星月胡钢英黄婷婷谢箐李丹胡笑容江洪
黄星月 胡钢英 黄婷婷 谢箐 李丹 胡笑容 江洪



摘要 目的检测高迁移率族蛋白1(HMGB1)在大鼠心肌中的表达,验证脑利钠肽(BNP)后处理是否能够减少心肌损伤。方法给予麻醉后的大鼠30 min心肌缺血,再灌注前静注BNP15 min,然后再灌注4 h。记录乳酸脱氢酸(LDH)、心肌磷酸激酶(CK),肿瘤坏死因子α(TNFα),白介素(IL6)等指标的变化,通过免疫印迹法评估HMGB1的表达。结果BNP后处理在4 h再灌注后可以显著减少心肌损伤大小和LDH,CK的表达(P<0.05),明显减少TNFα,IL6的增长。同时,在心肌损伤中可以明显抑制HMGB1的表达。结论BNP后处理可以通过抑制HMGB1的表达来保护心肌缺血再灌注损伤。
关键词:心肌缺血再灌注;脑利鈉肽;后处理;高迁移率族蛋白1
中图分类号:R542.2R285.5文献标识码:A
doi:10.3969/j.issn.16721349.2015.01.020文章编号:16721349(2015)01005503
Effect of Btype Natriuretic Peptide Postconditioning on Myocardial Ischemiareperfusion
Huang Xingyue,Hu Gangying,Huang Tingting,Xie Qing,Li Dan,Hu Xiaorong,Jiang Hong
The Peoples Hospital,Wuhan University,Wuhan 430060,Hubei,China
Corresponding Author:Hu Xiaorong
Abstract:ObjectiveTo explore the effect of Btype natriuretic peptide (BNP) preconditioning on myocardial ischemiareperfusion (I/R) injury and the expression of high mobility group box 1 protein (HMGB1) in rats.MethodsAnesthetized male rats were ischemia for 30 min,and then were treated with BNP in 15 min before reperfusion until the end of reperfusion,and followed by reperfusion for 4 hours. Lactate dehydrogenase (LDH),creatine kinase (CK),tumor necrosis factorα (TNFα),interleukin6(IL6) and infarct size were measured. HMGB1 expression was assessed by immunoblotting. ResultsThe Results showed that treatment of BNP postconditioning could significantly decrease the infarct size and the levels of LDH and CK after 4 h reperfusion (all P<0.05). BNP postconditioning could also significantly inhibit the increases of TNFα and IL6 (both P<0.05). Meanwhile,BNP postconditioning could significantly inhibit HMGB1 expression induced by I/R. ConclusionThe present study suggested that postconditioning of BNP could protect against myocardial I/R injury which might be associated with inhibiting HMGB1 expression.
Key words:myocardial ischemia;Btype natriuretic peptide;postconditioning;reperfusion;high mobility group box 1 protein
高迁移率族蛋白1(high mobility group box1 protein,HMGB1)是一种无染色体核的蛋白质,通常被坏死细胞、凋亡细胞或者被激活的非特异性免疫细胞(如巨噬细胞和单核细胞)抵抗性的大量释放[1,2]。 在一些心血管疾病中,HMGB1已经被证实是一种新型的促炎性细胞因子[36]。最近的研究显示HMGB1作为一种早期促炎性细胞因子在心肌缺血再灌注过程中持续存在,与传统的早期促炎性细胞因子例如肿瘤坏死因子α(TNFα)和白介素6(IL6)一样,而且还能够促进TNFα和IL6的释放。然而,HMGB1 A box 缩氨酸(一种特殊的HMGB1拮抗物)可以减少心肌缺血再灌注损伤并抑制TNFα和IL6的释放[3]。炎症反应被认为是心肌缺血再灌注损伤的关键因素[7,8]。
B型钠尿肽(BNP)的预处理和后处理能够减少心HMGB1在心肌缺血再灌注损伤中有着重要的影响。
肌缺血再灌注损伤,包括减少心肌酶的增加、梗死面积和细胞凋亡[912]。本研究通过大鼠心肌缺血再灌注模型,来验证BNP后处理是否可以通过抑制炎症反应(包括HMGB1的表达)来减少心肌缺血再灌注损伤的假设。……
