Document Detail


Enhanced neuronal damage by co-administration of quinolinic acid and free radicals, and protection by adenosine A2A receptor antagonists.
MedLine Citation:
PMID:  11906956     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
1. Quinolinic acid may be an important endogenous excitotoxin, but its concentrations in brain are low. We have therefore attempted to determine whether its neurotoxicity can be increased by the simultaneous presence of free radicals. 2. Quinolinic acid was injected into the hippocampus of anaesthetized rats at doses of 40 and 80 nmols which produced little neuronal loss, and 120 nmols which produced over 90% neuronal loss. 3. A mixture of xanthine and xanthine oxidase, a known source of free radical reactive oxygen species, also generated little damage alone, but killed over 80% of CA1 neurons when combined with 80 nmols of quinolinic acid. Similarly, the nitric oxide donor S-nitroso-N-acetylpenicillamine (SNAP) potentiated the damage produced by quinolinic acid. 4. The glutamate antagonist 5,7-dichlorokynurenic acid prevented the damage produced by 120 nmols of quinolinic acid, but not that produced by quinolinic acid plus xanthine/xanthine oxidase, indicating that damage was not simply the result of free radical enhancement of NMDA receptor activation. 5. Three chemically dissimilar antagonists at adenosine A(2A) receptors prevented the damage caused by quinolinic acid and xanthine/xanthine oxidase or by quinolinic acid plus SNAP. 6. It is concluded that reactive oxygen species can potentiate the neurotoxicity of quinolinic acid. The site of interaction is probably distal to the NMDA receptor. Blockade of adenosine A(2A) receptors can protect against this combined damage, suggesting potential value in the prevention of brain damage.
Authors:
W M H Behan; T W Stone
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  British journal of pharmacology     Volume:  135     ISSN:  0007-1188     ISO Abbreviation:  Br. J. Pharmacol.     Publication Date:  2002 Mar 
Date Detail:
Created Date:  2002-03-21     Completed Date:  2002-07-10     Revised Date:  2013-06-09    
Medline Journal Info:
Nlm Unique ID:  7502536     Medline TA:  Br J Pharmacol     Country:  England    
Other Details:
Languages:  eng     Pagination:  1435-42     Citation Subset:  IM    
Affiliation:
Institute of Biomedical & Life Sciences, University of Glasgow, Glasgow G12 8QQ, UK.
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MeSH Terms
Descriptor/Qualifier:
Animals
Cell Survival / drug effects,  physiology
Drug Combinations
Excitatory Amino Acid Antagonists / administration & dosage,  toxicity
Free Radicals / administration & dosage*,  toxicity
Hippocampus / drug effects,  pathology
Male
Neurons / drug effects*,  pathology
Neuroprotective Agents / pharmacology
Nitric Oxide Donors / administration & dosage*,  toxicity
Purinergic P1 Receptor Antagonists*
Purines / pharmacology
Quinolinic Acid / administration & dosage*,  toxicity
Rats
Rats, Wistar
Receptor, Adenosine A2A
Receptors, Purinergic P1 / physiology
Chemical
Reg. No./Substance:
0/Drug Combinations; 0/Excitatory Amino Acid Antagonists; 0/Free Radicals; 0/Neuroprotective Agents; 0/Nitric Oxide Donors; 0/Purinergic P1 Receptor Antagonists; 0/Purines; 0/Receptor, Adenosine A2A; 0/Receptors, Purinergic P1; 89-00-9/Quinolinic Acid
Comments/Corrections

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


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