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远程缺血预处理与脑缺血后处理联合应用可抑制自噬,减轻血浆高迁移率族蛋白B1水平,并诱导对大鼠中风的神经保护作用。

A Combination of Remote Ischemic Perconditioning and Cerebral Ischemic Postconditioning Inhibits Autophagy to Attenuate Plasma HMGB1 and Induce Neuroprotection Against Stroke in Rat.

作者信息

Wang Jue, Han Dong, Sun Miao, Feng Juan

机构信息

Department of Neurology, Shengjing Hospital, Affiliated Hospital of China Medical University, No.36 Sanhao Street, Shenyang, 110004, China.

出版信息

J Mol Neurosci. 2016 Apr;58(4):424-31. doi: 10.1007/s12031-016-0724-9. Epub 2016 Feb 6.

Abstract

Remote ischemic perconditioning (RIPerC) and ischemic postconditioning (IPOC) are well-acknowledged neuroprotective procedures during ischemic injury. The present study established a combined RIPerC and IPOC (RIPerC + IPOC) model in rats and studied how it would regulate the autophagy process and affect HMGB1 levels in a rat model of middle cerebral artery occlusion (MCAO). Rats with MCAO were treated with RIPerC by fastening and release of the left hind limb to achieve 4 cycles of 5 min remote ischemia reperfusion, 40 min prior to cerebral reperfusion, and then treated with IPOC by exposing the cerebral middle artery to 3 cycles of 30 s reperfusion/30 s occlusion at the onset of cerebral reperfusion. Infarction volumes, neurological deficits, and pathological changes were assessed 24 h after ischemia. The autophagy activator rapamycin (RAP) and the autophagy inhibitor 3-methyladenine (3-MA) were administrated for further mechanism. The expression and location of HMGB1 and the autophagy-related proteins like LC3, Beclin1, and P62 as well as plasma HMGB1 levels were measured. Our results suggested that RIPerC + IPOC attenuated plasma HMGB1 levels to intensify its neuroprotective effect against cerebral ischemic reperfusion injury via inhibiting the autophagy process.

摘要

远程缺血预处理(RIPerC)和缺血后处理(IPOC)是缺血性损伤期间公认的神经保护程序。本研究在大鼠中建立了RIPerC和IPOC联合(RIPerC + IPOC)模型,并研究了其在大脑中动脉闭塞(MCAO)大鼠模型中如何调节自噬过程以及影响HMGB1水平。通过固定和松开左后肢对MCAO大鼠进行RIPerC处理,以实现4个周期的5分钟远程缺血再灌注,在脑再灌注前40分钟进行,然后在脑再灌注开始时通过将大脑中动脉暴露于3个周期的30秒再灌注/30秒闭塞进行IPOC处理。在缺血24小时后评估梗死体积、神经功能缺损和病理变化。给予自噬激活剂雷帕霉素(RAP)和自噬抑制剂3-甲基腺嘌呤(3-MA)以进一步研究机制。检测HMGB1以及自噬相关蛋白如LC3、Beclin1和P62的表达和定位以及血浆HMGB1水平。我们的结果表明,RIPerC + IPOC通过抑制自噬过程降低血浆HMGB1水平,以增强其对脑缺血再灌注损伤的神经保护作用。

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