Linked Life Data

2163120

Source:http://linkedlifedata.com/resource/pubmed/id/2163120

Statements in which the resource exists as a subject.
PredicateObject
rdf:type
lifeskim:mentions
pubmed:issue
4
pubmed:dateCreated
1990-7-31
pubmed:abstractText
N-methyl-D-aspartic acid (NMDA), quisqualic acid (QUIS), and kainic acid (KAIN), respective agonists for three excitatory amino acid (EAA) receptor subtypes, stimulated [3H]dopamine ([3H]DA) release from dissociated cell cultures of fetal rat ventral mesencephalon. Release evoked by all three agonists was Ca2(+)-dependent and inhibited by broad-spectrum antagonists (D,L-cis-2,3-piperidine dicarboxylic acid [PDA] and kynurenic acid [KYN]). However, both of these antagonists were more potent against KAIN than against QUIS and only KAIN-evoked release was blocked by gamma-D-glutamyl-aminomethyl sulfonic acid (GAMS, IC50 700 microM). NMDA-stimulated [3H]DA release was selectively inhibited by competitive (3-[2-carboxypiperazine-4-yl]propyl-1-phosphonic acid [CPP] and D,L-2-amino-5-phosphonovaleric acid [APV]) and non-competitive (phencyclidine and MK-801) NMDA receptor antagonists. In 1.2 mM Mg2+, NMDA-stimulated [3H]DA release was Na(+)-dependent and inhibited by tetrodotoxin (TTX, 2 microM) or by the local anaesthetic, lidocaine (200 microM). However, in 0 Mg 2+, NMDA-evoked release was not inhibited by TTX or lidocaine. Thus, TTX-sensitivity of the NMDA response in 1.2 mM Mg2+ apparently occurs because Na(+)-action potentials are required to alleviate a Mg2+ blockade. Neither QUIS- nor KAIN-evoked release was affected by Mg2+ or TTX. When extracellular NaCl was replaced by sucrose or Na2SO4, the QUIS response was increased. KAIN-evoked release was unaffected by the sucrose substitution and was attenuated in the Na2SO4-containing buffer. It is concluded that NMDA and QUIS/KAIN release [3H]DA via separate receptor subtypes.
pubmed:language
eng
pubmed:journal
pubmed:citationSubset
IM
pubmed:chemical
pubmed:status
MEDLINE
pubmed:issn
0887-4476
pubmed:author
pubmed:issnType
Print
pubmed:volume
5
pubmed:owner
NLM
pubmed:authorsComplete
Y
pubmed:pagination
271-80
pubmed:dateRevised
2006-11-15
pubmed:meshHeading
pubmed:year
1990
pubmed:articleTitle
Subtypes of excitatory amino acid receptors involved in the stimulation of [3H]dopamine release from cell cultures of rat ventral mesencephalon.
pubmed:affiliation
Department of Psychiatry, McGill University, Verdun, Quebec, Canada.
pubmed:publicationType
Journal Article, Research Support, Non-U.S. Gov't