title: Inhibition of AMP-activated protein kinase alleviates focal cerebral ischemia injury in mice: Interference with mTOR and autophagy.
abstract: 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 3h and 6h and peaked at 3h after pMCAO in the cerebral ischemic cortex, and was decreased at 12h and 24h. 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 24h 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.
authors: Emergency Department, the First Affiliated Hospital of Nanchang University, Nanchang, Jiangxi, China.
authors: Le
authors: L
authors: Fu
authors: Emergency Department, the First Affiliated Hospital of Nanchang University, Nanchang, Jiangxi, China. Electronic address: huangliang6312@163.com.
authors: Liang
authors: L
authors: Huang
authors: Emergency Department, the First Affiliated Hospital of Nanchang University, Nanchang, Jiangxi, China.
authors: Chunshui
authors: C
authors: Cao
authors: Emergency Department, the First Affiliated Hospital of Nanchang University, Nanchang, Jiangxi, China.
authors: Qin
authors: Q
authors: Yin
authors: Emergency Department, the First Affiliated Hospital of Nanchang University, Nanchang, Jiangxi, China.
authors: Jian
authors: J
authors: Liu
mesh_terms: D055372:AMP-Activated Protein Kinases / Q000037:antagonists & inhibitors* / Q000378:metabolism*; D000818:Animals; D001343:Autophagy / Q000187:drug effects; D001921:Brain / Q000378:metabolism; D001930:Brain Injuries / Q000517:prevention & control*; D002545:Brain Ischemia; D002540:Cerebral Cortex / Q000378:metabolism; D004195:Disease Models, Animal; D007511:Ischemia; D008297:Male; D051379:Mice; D008807:Mice, Inbred BALB C; D047428:Protein Kinase Inhibitors / Q000494:pharmacology; D015398:Signal Transduction / Q000187:drug effects; D020521:Stroke; D058570:TOR Serine-Threonine Kinases / Q000378:metabolism / Q000494:pharmacology
chemical_list: D047428:Protein Kinase Inhibitors; C546843:mTOR protein, mouse; D058570:TOR Serine-Threonine Kinases; D055372:AMP-Activated Protein Kinases
keywords: AMPK; Autophagy; Cerebral ischemia; MTOR