Linked Life Data

10819904

Source:http://linkedlifedata.com/resource/pubmed/id/10819904

Statements in which the resource exists as a subject.
PredicateObject
rdf:type
lifeskim:mentions
pubmed:issue
4
pubmed:dateCreated
2000-6-6
pubmed:abstractText
Chronic dopaminomimetic administration to parkinsonian animal models or Parkinson's disease patients leads to characteristic alteration in motor response. Previous studies suggested that the nonphysiologic stimulation of dopaminergic receptors on striatal medium spiny neurons enhances the synaptic efficacy of juxtaposed glutamate receptors of the N-methyl-D-aspartate (NMDA) subtype. Resultant NMDA receptor sensitization due to differential changes in subunit phosphorylation appears to favor alterations in striatal output in ways that influence motor function. To detail the involvement of NMDA receptors further as well as to determine whether similar functional changes might develop in alpha-amino-3-hydroxy-5-methyl-4-isoxazole propionate (AMPA) receptors, the effects of selective antagonist of AMPA receptors (6-nitro-7-sulfamoyl-benzo[f]-quinoxaline-2,3 (1H,4H)-dione sodium salt, NBQX, 10 mg/kg) on levodopa-induced response alterations in 6-hydroxydopamine (6-OHDA) lesioned rats were compared with drugs which act competitively (3-(+/-)-2-carboxypiperazin-4-yl)-propyl-1-phosphonicacid, CPP, 6.25 mg/kg) or noncompetitively (dextromethorphan, 40 mg/kg) to block NMDA receptors, or a nonselective inhibitor of glutamatergic transmission (2-amino-6-trifluoromethoxy benzothiazole, riluzole, 5 mg/kg). We found that the shortened duration of the motor response to levodopa, which underlies human wearing-off fluctuations, was reversed to a similar degree by the acute coadministration of CPP, NBQX, or riluzole (n = 4-6) but dextromethorphan did not. These observations strengthen the possibility that a reduction in levodopa-associated changes in motor response by inhibitors of glutamatergic transmission acting generally or selectively at the glutamate binding-sites may relate to their ability to attenuate pathologic gain in striatal glutamatergic function. The capacity of NBQX to reverse these altered responses suggests that an enhanced synaptic efficacy of striatal AMPA receptors may also participate in the generation of these motor response changes in levodopa-treated parkinsonian rats.
pubmed:language
eng
pubmed:journal
pubmed:citationSubset
IM
pubmed:chemical
http://linkedlifedata.com/resource/pubmed/chemical/2,3-dioxo-6-nitro-7-sulfamoylbenzo(f..., http://linkedlifedata.com/resource/pubmed/chemical/3-(2-carboxypiperazin-4-yl)propyl-1-..., http://linkedlifedata.com/resource/pubmed/chemical/Antiparkinson Agents, http://linkedlifedata.com/resource/pubmed/chemical/Dextromethorphan, http://linkedlifedata.com/resource/pubmed/chemical/Excitatory Amino Acid Antagonists, http://linkedlifedata.com/resource/pubmed/chemical/Levodopa, http://linkedlifedata.com/resource/pubmed/chemical/Piperazines, http://linkedlifedata.com/resource/pubmed/chemical/Quinoxalines, http://linkedlifedata.com/resource/pubmed/chemical/Receptors, AMPA, http://linkedlifedata.com/resource/pubmed/chemical/Receptors, N-Methyl-D-Aspartate, http://linkedlifedata.com/resource/pubmed/chemical/Riluzole
pubmed:status
MEDLINE
pubmed:month
Jun
pubmed:issn
0887-4476
pubmed:author
pubmed:copyrightInfo
Copyright 2000 Wiley-Liss, Inc.
pubmed:issnType
Print
pubmed:day
15
pubmed:volume
36
pubmed:owner
NLM
pubmed:authorsComplete
Y
pubmed:pagination
267-74
pubmed:dateRevised
2006-11-15
pubmed:meshHeading
pubmed:year
2000
pubmed:articleTitle
Non-NMDA receptor-mediated mechanisms are involved in levodopa-induced motor response alterations in Parkinsonian rats.
pubmed:affiliation
Laboratori de Neurologia Experimental, Servei de Neurologia, Institut d'Investigacions Biomèdiques Agustí Pi i Sunyer (IDIBAPS), Barcelona, Spain. cmarin@medicina.ub.es
pubmed:publicationType
Journal Article, Research Support, Non-U.S. Gov't