Inhibition of AMP-activated protein kinase alleviates focal cerebral ischemia injury in mice: Interference with mTOR and autophagy
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- 作者：Le Fu ; Liang Huang ; huangliang6312@163.com" class="auth_mail" title="E-mail the corresponding author ; Chunshui Cao ; Qin Yin ; Jian Liu
- 关键词：AMPK ; AMP-activated protein kinase ; Atg ; autophagy related gene ; DAP1 ; death associated protein 1 ; 4EBP1 ; eukaryotic initiation factor 4E binding protein 1 ; FGF ; fibroblast growth factor ; HIF-1 ; hypoxia-inducible factor-1 ; FIP ; FAK family kinase-interacting protein ; mTOR ; mammalian target of rapamycin ; pMCAO ; permanent middle cerebral artery occlusion ; p70S6K ; p70 ribosomal protein S6 kinases ; PI3K ; phosphatidyl inositol 3-kinase ; PIKK ; phosphatidyl inositol kinase-related kinase ; TTC ; triphenyl
- 刊名：Brain Research
- 出版年：2016
- 出版时间：1 November 2016
- 年：2016
- 卷：1650
- 期：Complete
- 页码：103-111
- 全文大小：7486 K
文摘
Ischemic stroke is one of the most frequent acute cerebrovascular events worldwide. This study evaluated the variability of AMPK and mTOR and their relevance on LC3 and Beclin-1 expression, and further expounded the possible protective mechanism of inhibiting AMPK activity in the cerebral cortex after permanent focal cerebral ischemia injury in mice. Western blot and immunohistochemistry showed that p-AMPK expression was low in the cerebral cortex of the sham group; whereas it was significantly increased at 3 h and 6 h and peaked at 3 h after pMCAO in the cerebral ischemic cortex, and was decreased at 12 h and 24 h. The expression patterns of LC3 and Beclin-1 were the same as that of p-AMPK after occlusion, and the variability pattern between p-AMPK and p-mTOR levels was completely inverted. After treatment with the AMPK inhibitor Compound C, p-AMPK/LC3/Beclin-1 expression was decreased significantly, whereas p-mTOR level was increased significantly. Deficiency of Nissl bodies was reduced compared with that in the vehicle group at all times points after occlusion. Neurological deficits, infarct areas, and brain water content were also significantly reduced 24 h after occlusion with compound C treatment. The results suggested that the AMPK-autophagy pathway was activated, concomitant with mTOR inhibition in cerebral cortex after ischemic injury in mice. Moreover, inhibition of AMPK activity by Compound C inhibited autophagy and conferred protection against brain damage by restoring mTOR activity.