title: A dietary polyphenol resveratrol acts to provide neuroprotection in recurrent stroke models by regulating AMPK and SIRT1 signaling, thereby reducing energy requirements during ischemia.
abstract: Polyphenol resveratrol (RSV) has been associated with Silent Information Regulator T1 (SIRT1) and AMP-activated protein kinase (AMPK) metabolic stress sensors and probably responds to the intracellular energy status. Our aim here was to investigate the neuroprotective effects of RSV and its association with SIRT1 and AMPK signaling in recurrent ischemia models. In this study, elderly male Wistar rats received a combination of two mild transient middle cerebral artery occlusions (tMCAOs) as an in vivo recurrent ischemic model. Primary cultured cortical neuronal cells subjected to combined oxygen-glucose deprivation (OGD) were used as an in vitro recurrent ischemic model. RSV administration significantly reduced infarct volumes, improved behavioral deficits and protected neuronal cells from cell death in recurrent ischemic stroke models in vivo and in vitro. RSV treatments significantly increased the intracellular NAD(+) /NADH ratio, AMPK and SIRT1 activities, decreased energy assumption and restored cell energy ATP level. SIRT1 and AMPK inhibitors and specific small interfering RNA (siRNA) for SIRT1 and AMPK significantly abrogated the neuroprotection induced by RSV. AMPK-siRNA and inhibitor decreased SIRT1 activities; however, SIRT1-siRNA and inhibitor had no impact on phospho-AMPK (p-AMPK) levels. These results indicated that the neuroprotective effects of RSV increased the intracellular NAD(+) /NADH ratio as well as AMPK and SIRT1 activities, thereby reducing energy ATP requirements during ischemia. SIRT1 is a downstream target of p-AMPK signaling induced by RSV in the recurrent ischemic stroke model.
authors: Department of Neurobiology, Shandong Provincial Key Laboratory of Mental Disorders, School of Medicine, Shandong University, Jinan, Shandong, 250012, China. limeiwang@sdu.edu.cn
authors: Li-Mei
authors: LM
authors: Wang
authors: Yong-Jiu
authors: YJ
authors: Wang
authors: Min
authors: M
authors: Cui
authors: Wen-Juan
authors: WJ
authors: Luo
authors: Xiao-Ji
authors: XJ
authors: Wang
authors: Philip A
authors: PA
authors: Barber
authors: Zhe-Yu
authors: ZY
authors: Chen
mesh_terms: D055372:AMP-Activated Protein Kinases / Q000037:antagonists & inhibitors / Q000378:metabolism*; D000367:Age Factors; D000818:Animals; D002540:Cerebral Cortex / Q000166:cytology / Q000378:metabolism; D004032:Diet; D004734:Energy Metabolism; D004791:Enzyme Inhibitors / Q000494:pharmacology; D020244:Infarction, Middle Cerebral Artery / Q000188:drug therapy*; D008297:Male; D009243:NAD / Q000378:metabolism; D009474:Neurons / Q000187:drug effects / Q000378:metabolism; D018696:Neuroprotective Agents / Q000494:pharmacology / Q000627:therapeutic use*; D034741:RNA, Small Interfering / Q000494:pharmacology; D051381:Rats; D017208:Rats, Wistar; D000077185:Resveratrol; D015398:Signal Transduction; D056564:Sirtuin 1 / Q000037:antagonists & inhibitors / Q000378:metabolism*; D013267:Stilbenes / Q000494:pharmacology / Q000627:therapeutic use*; D020521:Stroke / Q000188:drug therapy*
chemical_list: D004791:Enzyme Inhibitors; D018696:Neuroprotective Agents; D034741:RNA, Small Interfering; D013267:Stilbenes; D009243:NAD; D055372:AMP-Activated Protein Kinases; C488368:Sirt1 protein, rat; D056564:Sirtuin 1; D000077185:Resveratrol