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NMDA antagonists potentiate antiparkinsonian actions of L ‐dopa in monoamine‐depleted rats

NMDA antagonists potentiate antiparkinsonian actions of L ‐dopa in monoamine‐depleted rats Systemically administered N‐methyl‐D‐aspartate (NMDA) antagonists, MK‐801((+)5‐methyl‐10,11‐dihydro‐5H‐dibenzo(a, d)cyclohepten‐5,10‐imine maleate) and CPP(3‐((±)‐2‐carboxypiperazin‐4‐y1)‐propyl‐1‐phosphonate), potentiate the ability of L‐dopa (L‐3,4‐dihydroxyphenylalanine) to reverse akinesia and to alleviate muscular rigidity in monoamine‐depleted rats. On the basis of these findings, it is proposed that NMDA antagonists may be beneficial as adjunctive treatment in the therapy of Parkinson's disease. CPP locally injected into the subthalamic nucleus, entopeduncular nucleus–the rat homologue of the internal pallidal segment–or substantia nigra pars reticulata of monoamine‐depleted rats stimulates locomotor activity and alleviates rigidity, whereas local microinjection of CPP into the neostriatum is ineffective. These results make it unlikely that the neostriatum is the site of the antiparkinsonian action of NMDA antagonists in monoamine‐depleted rats, whereas the subthalamic nucleus, internal pallidal segment, and substantia nigra pars reticulata appear to be important for the effects of NMDA antagonists. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Annals of Neurology Wiley

NMDA antagonists potentiate antiparkinsonian actions of L ‐dopa in monoamine‐depleted rats

Annals of Neurology , Volume 28 (4) – Oct 1, 1990

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References (35)

Publisher
Wiley
Copyright
Copyright © 1990 American Neurological Association
ISSN
0364-5134
eISSN
1531-8249
DOI
10.1002/ana.410280411
pmid
2252365
Publisher site
See Article on Publisher Site

Abstract

Systemically administered N‐methyl‐D‐aspartate (NMDA) antagonists, MK‐801((+)5‐methyl‐10,11‐dihydro‐5H‐dibenzo(a, d)cyclohepten‐5,10‐imine maleate) and CPP(3‐((±)‐2‐carboxypiperazin‐4‐y1)‐propyl‐1‐phosphonate), potentiate the ability of L‐dopa (L‐3,4‐dihydroxyphenylalanine) to reverse akinesia and to alleviate muscular rigidity in monoamine‐depleted rats. On the basis of these findings, it is proposed that NMDA antagonists may be beneficial as adjunctive treatment in the therapy of Parkinson's disease. CPP locally injected into the subthalamic nucleus, entopeduncular nucleus–the rat homologue of the internal pallidal segment–or substantia nigra pars reticulata of monoamine‐depleted rats stimulates locomotor activity and alleviates rigidity, whereas local microinjection of CPP into the neostriatum is ineffective. These results make it unlikely that the neostriatum is the site of the antiparkinsonian action of NMDA antagonists in monoamine‐depleted rats, whereas the subthalamic nucleus, internal pallidal segment, and substantia nigra pars reticulata appear to be important for the effects of NMDA antagonists.

Journal

Annals of NeurologyWiley

Published: Oct 1, 1990

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