Document Detail


Chronic activity wheel running reduces the severity of kainic acid-induced seizures in the rat: possible role of galanin.
MedLine Citation:
PMID:  19248773     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
Studies in both humans and rodents suggest that exercise can be neuroprotective, but the mechanisms by which this occurs are still poorly understood. Three weeks of voluntary, physical activity in rats upregulates prepro-galanin messenger RNA levels in the locus coeruleus. Galanin is a neuropeptide extensively coexisting with norepinephrine that decreases neuronal hyperexcitability both in vivo and in vitro. Thus, exercise may diminish neural hyperexcitability through a galaninergic mechanism. The current experiments tested whether voluntary activity wheel running would protect against kainic acid-evoked seizures and whether galaninergic signaling is a necessary factor in this protection. In experiment 1, rats were given access to running wheels or remained sedentary for three weeks. After this period, rats received an intraperitoneal (i.p.) injection of 0, 7, 10 or 14 mg/kg kainic acid. Exercise decreased the severity of or eliminated seizure behaviors and hippocampal c-fos expression induced by kainic acid. In experiment 2, exercising or sedentary rats were injected intracerebroventricularly (i.c.v.) with 0.2 or 0.4 microg of kainic acid following either an injection of M-40 (a galanin receptor antagonist) or saline. Exercise decreased kainic acid-induced seizures at the 0.2 microg dose, and M-40 (6 nmol) decreased this effect. In contrast, there were no detectable differences between exercising and sedentary rats in behavior at the 0.4 microg dose. The results suggest that the protective effects of exercise against seizures are at least partially mediated by regulation of neural excitability through a process involving galanin.
Authors:
J I Reiss; R K Dishman; H E Boyd; J K Robinson; P V Holmes
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Publication Detail:
Type:  Journal Article     Date:  2009-02-25
Journal Detail:
Title:  Brain research     Volume:  1266     ISSN:  1872-6240     ISO Abbreviation:  Brain Res.     Publication Date:  2009 Apr 
Date Detail:
Created Date:  2009-04-06     Completed Date:  2009-05-26     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  0045503     Medline TA:  Brain Res     Country:  Netherlands    
Other Details:
Languages:  eng     Pagination:  54-63     Citation Subset:  IM    
Affiliation:
Neuroscience and Behavior Program, Department of Psychology, The University of Georgia, Athens, GA 30602, USA.
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MeSH Terms
Descriptor/Qualifier:
Analysis of Variance
Animals
Autoradiography
Catheterization
Dose-Response Relationship, Drug
Galanin / administration & dosage,  antagonists & inhibitors,  metabolism*
Hippocampus / drug effects,  physiopathology
In Situ Hybridization
Injections, Intraperitoneal
Injections, Intraventricular
Kainic Acid
Male
Motor Activity*
Peptide Fragments / administration & dosage
Physical Conditioning, Animal / physiology*
Proto-Oncogene Proteins c-fos / metabolism
RNA, Messenger / metabolism
Rats
Rats, Sprague-Dawley
Seizures / chemically induced,  physiopathology*
Chemical
Reg. No./Substance:
0/M40; 0/Peptide Fragments; 0/Proto-Oncogene Proteins c-fos; 0/RNA, Messenger; 487-79-6/Kainic Acid; 88813-36-9/Galanin

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


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