title: Pre-ischemic treadmill training alleviates brain damage via GLT-1-mediated signal pathway after ischemic stroke in rats.
abstract: Physical exercise could play a neuroprotective role in both human and animals. However, the involved signal pathways underlying the neuroprotective effect are still not well established. This study was to investigate the possible signal pathways involved in the neuroprotection of pre-ischemic treadmill training after ischemic stroke. Seventy-two SD rats were randomly assigned into three groups (n=24/group): sham surgery group, middle cerebral artery occlusion (MCAO) group and MCAO with exercise group. Following three weeks of treadmill training exercise, ischemic stroke was induced by occluding the middle cerebral artery (MCA) in rat for 2 h, followed by reperfusion. Twenty-four hours after MCAO/reperfusion, 12 rats in each group were evaluated for neurological deficit scores and then sacrificed to measure the infarct volume (n=6) and cerebral edema (n=6). Six rats in each group were sacrificed to measure the expression level of glutamate transporter-1 (GLT-1), protein kinase C-α (PKC-α), Akt, and phosphatidylinositol 3 kinase (PI3K) (n=6). Two hundred and eighty minutes (4.67 h) after occlusion, six rats in each group were decapitated to detect the mRNA expression level of metabotropic glutamate receptor 5 (mGluR5) and N-methyl-D-aspartate receptor subunit type 2B (NR2B) (n=6).The results demonstrated that pre-ischemic treadmill training exercise reduced brain infarct volume, cerebral edema and neurological deficits, also decreased the over expression of PKC-α and increased the expression level of GLT-1, Akt and PI3K after ischemic stroke (p<0.05). The over-expression of mGluR5 and NR2B mRNA was also inhibited by pre-ischemic exercise (p<0.05). In summary, exercise preconditioning ameliorated brain damage after ischemic stroke, which might be involved in two signal pathways: PKC-α-GLT-1-Glutamate and PI3K/Akt-GLT-1-Glutamate.
authors.affiliation: Department of Neurology, The Third Hospital of Hebei Medical University, Shijiazhuang 050051, PR China.
authors.forename: X
authors.initials: X
authors.lastname: Wang
authors.affiliation: Department of Pathophysiology, Hebei Medical University, Shijiazhuang 050017, PR China.
authors.forename: M
authors.initials: M
authors.lastname: Zhang
authors.affiliation: Department of Spine Surgery, The Third Hospital of Hebei Medical University, Shijiazhuang 050051, PR China.
authors.forename: S-D
authors.initials: SD
authors.lastname: Yang
authors.affiliation: Department of Pathophysiology, Hebei Medical University, Shijiazhuang 050017, PR China.
authors.forename: W-B
authors.initials: WB
authors.lastname: Li
authors.affiliation: Department of Neurology, The Third Hospital of Hebei Medical University, Shijiazhuang 050051, PR China.
authors.forename: S-Q
authors.initials: SQ
authors.lastname: Ren
authors.affiliation: Department of Rehabilitation Medicine, The Third Hospital of Hebei Medical University, Shijiazhuang 050051, PR China; Hebei Provincial Orthopedic Biomechanics Key Laboratory, Shijiazhuang 050051, PR China.
authors.forename: J
authors.initials: J
authors.lastname: Zhang
authors.affiliation: Department of Rehabilitation Medicine, The Third Hospital of Hebei Medical University, Shijiazhuang 050051, PR China; Hebei Provincial Orthopedic Biomechanics Key Laboratory, Shijiazhuang 050051, PR China. Electronic address: zjk20019@126.com.
authors.forename: F
authors.initials: F
authors.lastname: Zhang
mesh_terms: D000818:Animals; D001921:Brain / Q000473:pathology / Q000503:physiopathology*; D001929:Brain Edema / Q000473:pathology / Q000503:physiopathology; D002545:Brain Ischemia / Q000473:pathology / Q000503:physiopathology*; D004195:Disease Models, Animal; D027342:Excitatory Amino Acid Transporter 2 / Q000378:metabolism*; D020244:Infarction, Middle Cerebral Artery; D008297:Male; D009043:Motor Activity / Q000502:physiology*; D019869:Phosphatidylinositol 3-Kinases / Q000378:metabolism; D051571:Protein Kinase C-alpha / Q000378:metabolism; D051057:Proto-Oncogene Proteins c-akt / Q000378:metabolism; D012333:RNA, Messenger / Q000378:metabolism; D011897:Random Allocation; D017207:Rats, Sprague-Dawley; D064529:Receptor, Metabotropic Glutamate 5 / Q000378:metabolism; D016194:Receptors, N-Methyl-D-Aspartate / Q000378:metabolism; D012720:Severity of Illness Index; D015398:Signal Transduction / Q000502:physiology; D020521:Stroke / Q000473:pathology / Q000503:physiopathology*; D013997:Time Factors
chemical_list: D027342:Excitatory Amino Acid Transporter 2; C578937:Grm5 protein, rat; C121001:NR2B NMDA receptor; D012333:RNA, Messenger; D064529:Receptor, Metabotropic Glutamate 5; D016194:Receptors, N-Methyl-D-Aspartate; C493395:Slc1a2 protein, rat; D019869:Phosphatidylinositol 3-Kinases; D051057:Proto-Oncogene Proteins c-akt; D051571:Protein Kinase C-alpha
keywords: exercise preconditioning; glutamate transporter-1 (GLT-1); middle cerebral artery occlusion (MCAO); phosphatidylinositol 3 kinase (PI3K); protein kinase B (PKB)