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• W1971301285 abstract "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." @default.
• W1971301285 created "2016-06-24" @default.
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• W1971301285 date "2000-06-15" @default.
• W1971301285 modified "2023-10-18" @default.
• W1971301285 title "Non-NMDA receptor-mediated mechanisms are involved in levodopa-induced motor response alterations in parkinsonian rats" @default.
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• W1971301285 doi "https://doi.org/10.1002/(sici)1098-2396(20000615)36:4<267::aid-syn3>3.0.co;2-y" @default.
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