Linked Life Data

7907651

Source:http://linkedlifedata.com/resource/pubmed/id/7907651

Statements in which the resource exists as a subject.
PredicateObject
rdf:type
lifeskim:mentions
pubmed:issue
4
pubmed:dateCreated
1994-4-20
pubmed:abstractText
The effect of the non-N-methyl-D-aspartate (non-NMDA) receptor antagonist 1-(4-aminophenyl)-4-methyl-7,8-methylenedioxy-5H-2,3-benzodiazepine hydrochloride (GYKI 52466) on ischaemia-induced changes in the microdialysate and tissue concentrations of glutamate, aspartate, and gamma-aminobutyric acid (GABA) was studied in rats. Twenty minutes of four-vessel occlusion resulted in a transient increase in microdialysate levels of glutamate, aspartate, and GABA in striatum, cortex, and hippocampus. Administration of GYKI 52466 (10 mg/kg bolus + 10 mg/kg/60 min intravenously starting 20 min before onset of ischaemia) inhibited ischaemia-induced increases in microdialysate glutamate and GABA in striatum without affecting the increases in hippocampus or cortex. Twenty minutes of four-vessel occlusion resulted in immediate small decreases and larger delayed (72 h) decreases in tissue levels of glutamate and aspartate. Transient increases in tissue levels of GABA were shown in all three structures at the end of the ischaemic period. At 72 h, after the ischaemic period, significantly reduced GABA levels were observed in striatum and hippocampus. GYKI 52466, given under identical conditions as above, augmented the ischaemia-induced decrease in striatal tissue levels of glutamate and aspartate, without significantly affecting the decreases in hippocampus and cortex. Twenty minutes of ischaemia resulted in a large increase in microdialysate dopamine in striatum. GYKI 52466 failed to inhibit this increase. Kainic acid (500 microM infused through the probe for 20 min) caused increases in microdialysate glutamate and aspartate in the striatum. GYKI 52466 (10 mg/kg bolus + 10 mg/kg/60 min) completely inhibited the kainic acid-induced glutamate release. In conclusion, the action of the non-NMDA antagonist, GYKI 52466, in the striatum is different from that in the cortex and hippocampus. The inhibition by GYKI 52466 of ischaemia-induced and kainate-induced increases in microdialysate glutamate concentration in the striatum may be related to the neuroprotection provided by GYKI 52466 in this region.
pubmed:grant
pubmed:language
eng
pubmed:journal
pubmed:citationSubset
IM
pubmed:chemical
pubmed:status
MEDLINE
pubmed:month
Apr
pubmed:issn
0022-3042
pubmed:author
pubmed:issnType
Print
pubmed:volume
62
pubmed:owner
NLM
pubmed:authorsComplete
Y
pubmed:pagination
1458-67
pubmed:dateRevised
2009-9-29
pubmed:meshHeading
pubmed-meshheading:7907651-Amino Acids, pubmed-meshheading:7907651-Animals, pubmed-meshheading:7907651-Anti-Anxiety Agents, pubmed-meshheading:7907651-Aspartic Acid, pubmed-meshheading:7907651-Benzodiazepines, pubmed-meshheading:7907651-Cerebral Cortex, pubmed-meshheading:7907651-Corpus Striatum, pubmed-meshheading:7907651-Dialysis, pubmed-meshheading:7907651-Dopamine, pubmed-meshheading:7907651-Glutamates, pubmed-meshheading:7907651-Glutamic Acid, pubmed-meshheading:7907651-Hippocampus, pubmed-meshheading:7907651-Ischemic Attack, Transient, pubmed-meshheading:7907651-Kainic Acid, pubmed-meshheading:7907651-Male, pubmed-meshheading:7907651-Neurotoxins, pubmed-meshheading:7907651-Prosencephalon, pubmed-meshheading:7907651-Rats, pubmed-meshheading:7907651-Rats, Wistar, pubmed-meshheading:7907651-Receptors, Neurotransmitter, pubmed-meshheading:7907651-gamma-Aminobutyric Acid
pubmed:year
1994
pubmed:articleTitle
Effect of the non-NMDA receptor antagonist GYKI 52466 on the microdialysate and tissue concentrations of amino acids following transient forebrain ischaemia.
pubmed:affiliation
Department of Neurology, Institute of Psychiatry, London, England.
pubmed:publicationType
Journal Article, Research Support, Non-U.S. Gov't