Document Detail


Role of protein synthesis in the ischemic tolerance acquisition induced by transient forebrain ischemia in the rat.
MedLine Citation:
PMID:  12834261     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
Although ischemic preconditioning of the heart and brain is a well-documented neuroprotective phenomenon, the mechanism underlying the increased resistance to severe ischemia induced by a preceding mild ischemic exposure remains unclear. In this study we have determined the effect of ischemic preconditioning on ischemia/reperfusion-associated translation inhibition in the neocortex and hippocampus of the rat. We studied the effect of the duration on the sublethal ischemic episode (3, 4, 5 or 8 min), as well as the amount of time elapsed between sublethal and lethal ischemia on the cell death 7 days after the last ischemic episode. In addition, the rate of protein synthesis in vitro and expression of the 72-kD heat shock protein (hsp) were determined under the different experimental conditions. Our results suggest that two different mechanisms are essential for the acquisition of ischemic tolerance, at least in the CA1 sector of hippocampus. The first mechanism implies a highly significant reduction in translation inhibition after lethal ischemia, especially at an early time of reperfusion, in both vulnerable and nonvulnerable neurons. For the acquisition of full tolerance, a second mechanism, highly dependent on the time interval between preconditioning (sublethal ischemia) and lethal ischemia, is absolutely necessary; this second mechanism involves synthesis of protective proteins, which prevent the delayed death of vulnerable neurons.
Authors:
Jozef Burda; Milina Hrehorovská; Lidia García Bonilla; Viera Danielisová; Dása Cízková; Rastislav Burda; Miroslava Némethová; Juan L Fando; Matilde Salinas
Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  Neurochemical research     Volume:  28     ISSN:  0364-3190     ISO Abbreviation:  Neurochem. Res.     Publication Date:  2003 Aug 
Date Detail:
Created Date:  2003-07-01     Completed Date:  2003-09-03     Revised Date:  2006-11-15    
Medline Journal Info:
Nlm Unique ID:  7613461     Medline TA:  Neurochem Res     Country:  United States    
Other Details:
Languages:  eng     Pagination:  1213-9     Citation Subset:  IM    
Affiliation:
Department of Neurochemistry, Institute of Neurobiology, Slovak Academy of Sciences, Soltésovej 4, 040 01 Kosice, Slovakia. burda@saske.sk
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MeSH Terms
Descriptor/Qualifier:
Animals
Brain Ischemia / metabolism*
HSP72 Heat-Shock Proteins
Heat-Shock Proteins / genetics,  metabolism
Muscle Proteins / biosynthesis*,  genetics
Nerve Tissue Proteins / biosynthesis*,  genetics
Prosencephalon / metabolism*,  pathology
Protein Biosynthesis
Rats
Rats, Wistar
Chemical
Reg. No./Substance:
0/HSP72 Heat-Shock Proteins; 0/Heat-Shock Proteins; 0/Muscle Proteins; 0/Nerve Tissue Proteins

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