Linked Life Data

2899450

Source:http://linkedlifedata.com/resource/pubmed/id/2899450

Statements in which the resource exists as a subject.
PredicateObject
rdf:type
lifeskim:mentions
pubmed:issue
1-2
pubmed:dateCreated
1988-8-31
pubmed:abstractText
The cataleptic activity of morphine and methadone was markedly potentiated in frontally decorticated rats with no apparent changes in the onset or duration of action. Enhancement of the opioid cataleptic response was not due to changes in the availability of the drugs in the brain. The potentiation of methadone-induced catalepsy in decorticated rats was mimicked in naive rats by intrastriatal (i.s.) application of 2-amino-7-phosphonoheptanoic acid (AP7), a potent and selective antagonist of N-methyl-D-aspartate (NMDA) receptors. Therefore, degeneration of glutamatergic synapses following decortication could be responsible for the changes in behavioral effects caused by opioids. The failure of AP7 to elicit an effect after injection into the n. accumbens fits with the possibility of a selective involvement of the striatum in this phenomenon. That the striatum plays a critical role in the expression of opioid-induced catalepsy was substantiated by the findings that: (1) naloxone, an opioid antagonist, injected i.s., prevents the potentiation of catalepsy induced by methadone and morphine in decorticated animals, (2) oxotremorine, a muscarinic agonist, injected i.s., reverses the enhancement of opioid-catalepsy in decorticated rats, (3) earlier studies by others showed that ablation of the striatum had a facilitatory action on opioid-induced catalepsy. In conclusion, evidence is given that the corticostriatal pathway exerts an inhibitory effect upon narcotic-induced cataleptic behavior. The possibility that this effect is mediated through striatonigral GABAergic output is discussed. The data further suggest that the neuronal mechanisms through which the corticostriatal pathway mediates narcotic catalepsy is operative through activation of NMDA receptors within the striatum.
pubmed:language
eng
pubmed:journal
pubmed:citationSubset
IM
pubmed:chemical
pubmed:status
MEDLINE
pubmed:month
May
pubmed:issn
0006-8993
pubmed:author
pubmed:issnType
Print
pubmed:day
24
pubmed:volume
449
pubmed:owner
NLM
pubmed:authorsComplete
Y
pubmed:pagination
97-103
pubmed:dateRevised
2006-11-15
pubmed:meshHeading
pubmed:year
1988
pubmed:articleTitle
Enhancement of opioid cataleptic response by cortical frontal deafferentation or intrastriatal injection of NMDA-receptor antagonists.
pubmed:affiliation
Istituto di Ricerche Farmacologiche Mario Negri, Milan, Italy.
pubmed:publicationType
Journal Article, Research Support, U.S. Gov't, Non-P.H.S.