Document Detail


Pre-ischemic treadmill training induces tolerance to brain ischemia: involvement of glutamate and ERK1/2.
MedLine Citation:
PMID:  20714296     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
Physical exercise has been shown to be beneficial in stroke patients and animal stroke models. However, the exact mechanisms underlying this effect are not yet very clear. The present study investigated whether pre-ischemic treadmill training could induce brain ischemic tolerance (BIT) by inhibiting the excessive glutamate release and event-related kinase 1/2 (ERK1/2) activation observed in rats exposed to middle cerebral artery occlusion (MCAO). Sprague-Dawley rats were divided into three groups (n = 12/group): sham surgery without prior exercise, MCAO without prior exercise and MCAO following three weeks of exercise. Pre-MCAO exercise significantly reduced brain infarct size (103.1 +/- 6.7 mm3) relative to MCAO without prior exercise (175.9 +/- 13.5 mm3). Similarly, pre-MCAO exercise significantly reduced neurological defects (1.83 +/- 0.75) relative to MCAO without exercise (3.00 +/- 0.63). As expected, MCAO increased levels of phospho-ERK1/2 (69 +/- 5%) relative to sham surgery (40 +/- 5%), and phospho-ERK1/2 levels were normalized in rats exposed to pre-ischemic treadmill training (52 +/- 6%) relative to MCAO without exercise (69% +/- 5%). Parallel effects were observed on striatal glutamate overflow. This study suggests that pre-ischemic treadmill training might induce neuroprotection by inhibiting the phospho-ERK1/2 over-activation and reducing excessive glutamate release.
Authors:
Feng Zhang; Yi Wu; Jie Jia; Yong-Shan Hu
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't     Date:  2010-08-02
Journal Detail:
Title:  Molecules (Basel, Switzerland)     Volume:  15     ISSN:  1420-3049     ISO Abbreviation:  Molecules     Publication Date:  2010 Aug 
Date Detail:
Created Date:  2010-08-17     Completed Date:  2010-12-03     Revised Date:  2010-12-15    
Medline Journal Info:
Nlm Unique ID:  100964009     Medline TA:  Molecules     Country:  Switzerland    
Other Details:
Languages:  eng     Pagination:  5246-57     Citation Subset:  IM    
Affiliation:
Department of Rehabilitation Medicine, Hua Shan Hospital, Fudan University, Shanghai, China. zjk20019@126.com
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MeSH Terms
Descriptor/Qualifier:
Animals
Behavior, Animal
Brain Infarction / complications,  enzymology,  pathology
Brain Ischemia / complications,  enzymology*,  prevention & control*
Exercise Test*
Glutamic Acid / metabolism*
Male
Mitogen-Activated Protein Kinase 1 / metabolism*
Mitogen-Activated Protein Kinase 3 / metabolism*
Neostriatum / metabolism,  pathology
Phosphorylation
Physical Conditioning, Animal*
Rats
Rats, Sprague-Dawley
Chemical
Reg. No./Substance:
56-86-0/Glutamic Acid; EC 2.7.11.24/Mitogen-Activated Protein Kinase 1; EC 2.7.11.24/Mitogen-Activated Protein Kinase 3

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine


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