125I-CGP 64213 binding to GABA(B) receptors in the brain of monkeys: effect of MPTP and dopaminomimetic treatments.
Identifieur interne : 000095 ( Ncbi/Curation ); précédent : 000094; suivant : 000096125I-CGP 64213 binding to GABA(B) receptors in the brain of monkeys: effect of MPTP and dopaminomimetic treatments.
Auteurs : F. Calon [Canada] ; M. Morissette ; M. Goulet ; R. Grondin ; P J Blanchet ; P J Bédard ; T. Di PaoloSource :
- Experimental neurology [ 0014-4886 ] ; 2000.
English descriptors
- KwdEn :
- 1-Methyl-4-phenyl-1,2,3,6-tetrahydropyridine, Animals, Antiparkinson Agents (pharmacology), Autoradiography, Basal Ganglia (drug effects), Basal Ganglia (metabolism), Basal Ganglia (pathology), Benzazepines (pharmacology), Benzoates (metabolism), Binding Sites, Brain (drug effects), Brain (metabolism), Brain (pathology), Corpus Striatum (drug effects), Dopamine Agonists (pharmacology), Drug Administration Schedule, Dyskinesia, Drug-Induced (metabolism), Ergolines (pharmacology), Female, GABA Antagonists (metabolism), GABA-B Receptor Antagonists, Injections, Subcutaneous, Iodine Radioisotopes, Macaca fascicularis, Organophosphorus Compounds (metabolism), Parkinson Disease, Secondary (chemically induced), Parkinson Disease, Secondary (drug therapy), Parkinson Disease, Secondary (metabolism), Receptors, GABA-B (metabolism), Substantia Nigra (drug effects), Substantia Nigra (pathology), Thalamus (drug effects), Thalamus (metabolism), Thalamus (pathology).
- MESH :
- chemical , metabolism : Benzoates, GABA Antagonists, Organophosphorus Compounds, Receptors, GABA-B.
- chemical , pharmacology : Antiparkinson Agents, Benzazepines, Dopamine Agonists, Ergolines.
- chemical : 1-Methyl-4-phenyl-1,2,3,6-tetrahydropyridine, GABA-B Receptor Antagonists, Iodine Radioisotopes.
- chemically induced : Parkinson Disease, Secondary.
- drug effects : Basal Ganglia, Brain, Corpus Striatum, Substantia Nigra, Thalamus.
- drug therapy : Parkinson Disease, Secondary.
- metabolism : Basal Ganglia, Brain, Dyskinesia, Drug-Induced, Parkinson Disease, Secondary, Thalamus.
- pathology : Basal Ganglia, Brain, Substantia Nigra, Thalamus.
- Animals, Autoradiography, Binding Sites, Drug Administration Schedule, Female, Injections, Subcutaneous, Macaca fascicularis.
Abstract
Much evidence indicates that abnormal GABA neurotransmission may be implicated in the pathophysiology of Parkinson's disease (PD) and dopaminomimetic-induced dyskinesias (DID). In this study, autoradiography using (125)I-CGP 64213 was performed to investigate GABA(B) receptor density in the brain of control monkeys as well as monkeys with MPTP-induced nigrostriatal depletion. Three MPTP monkeys received pulsatile administrations of the D1 dopamine (DA) receptor agonist (SKF 82958) whereas a long-acting D2 DA receptor agonist (cabergoline) was given to another three animals. SKF 82958 treatment relieved parkinsonian symptoms but two of three animals developed DID. Cabergoline induced a comparable motor benefit effect without persistent DID. (125)I-CGP 64213 binding to GABA(B) receptors was heterogeneous throughout the brain with the highest levels in the medial habenula of the thalamus. MPTP induced a decrease (-40%) of (125)I-CGP 64213 binding to GABA(B) receptors in the substantia nigra pars compacta (SNpc) and an increase (+29%) in the internal segment of the globus pallidus (GPi). This increase in the GPi was not affected by SKF 82958 but partly reversed by cabergoline. No change was seen in the striatum, the thalamus, the external segment of the globus pallidus, and the substantia nigra pars reticulata following MPTP and dopaminomimetic treatments. The changes of GABA(B) receptors observed in the SNpc and in the GPi suggest that alteration of GABA(B) receptors may play a role in the pathophysiology of PD and DID.
DOI: 10.1006/exnr.2000.7366
PubMed: 10785458
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pubmed:10785458Le document en format XML
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<term>Antiparkinson Agents (pharmacology)</term>
<term>Autoradiography</term>
<term>Basal Ganglia (drug effects)</term>
<term>Basal Ganglia (metabolism)</term>
<term>Basal Ganglia (pathology)</term>
<term>Benzazepines (pharmacology)</term>
<term>Benzoates (metabolism)</term>
<term>Binding Sites</term>
<term>Brain (drug effects)</term>
<term>Brain (metabolism)</term>
<term>Brain (pathology)</term>
<term>Corpus Striatum (drug effects)</term>
<term>Dopamine Agonists (pharmacology)</term>
<term>Drug Administration Schedule</term>
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<term>GABA-B Receptor Antagonists</term>
<term>Injections, Subcutaneous</term>
<term>Iodine Radioisotopes</term>
<term>Macaca fascicularis</term>
<term>Organophosphorus Compounds (metabolism)</term>
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<term>Parkinson Disease, Secondary (drug therapy)</term>
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<term>Organophosphorus Compounds</term>
<term>Receptors, GABA-B</term>
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<term>Dopamine Agonists</term>
<term>Ergolines</term>
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<term>GABA-B Receptor Antagonists</term>
<term>Iodine Radioisotopes</term>
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<term>Brain</term>
<term>Corpus Striatum</term>
<term>Substantia Nigra</term>
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<term>Dyskinesia, Drug-Induced</term>
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<term>Autoradiography</term>
<term>Binding Sites</term>
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<front><div type="abstract" xml:lang="en">Much evidence indicates that abnormal GABA neurotransmission may be implicated in the pathophysiology of Parkinson's disease (PD) and dopaminomimetic-induced dyskinesias (DID). In this study, autoradiography using (125)I-CGP 64213 was performed to investigate GABA(B) receptor density in the brain of control monkeys as well as monkeys with MPTP-induced nigrostriatal depletion. Three MPTP monkeys received pulsatile administrations of the D1 dopamine (DA) receptor agonist (SKF 82958) whereas a long-acting D2 DA receptor agonist (cabergoline) was given to another three animals. SKF 82958 treatment relieved parkinsonian symptoms but two of three animals developed DID. Cabergoline induced a comparable motor benefit effect without persistent DID. (125)I-CGP 64213 binding to GABA(B) receptors was heterogeneous throughout the brain with the highest levels in the medial habenula of the thalamus. MPTP induced a decrease (-40%) of (125)I-CGP 64213 binding to GABA(B) receptors in the substantia nigra pars compacta (SNpc) and an increase (+29%) in the internal segment of the globus pallidus (GPi). This increase in the GPi was not affected by SKF 82958 but partly reversed by cabergoline. No change was seen in the striatum, the thalamus, the external segment of the globus pallidus, and the substantia nigra pars reticulata following MPTP and dopaminomimetic treatments. The changes of GABA(B) receptors observed in the SNpc and in the GPi suggest that alteration of GABA(B) receptors may play a role in the pathophysiology of PD and DID.</div>
</front>
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