Abstract
Marmosets treated with 1-methyl-4-phenyl-1,2,3,6-tetrahydropyridine (MPTP) (1-4 mg/kg i.p. daily for up to 8 days) develop profound parkinsonian akinesia. Administration of the D1 agonist SKF 38393 (1-20 mg/kg i.p.) 4-6 weeks later had no effect on the motor activity of animals pretreated with MPTP. In contrast, the administration of the D2 agonist LY 141865 (0.1 or 0.5 mg/kg i.p.) caused a marked increase in motor activity lasting for up to 2 h. We conclude that stimulation of D2 dopamine receptors is essential for motor activation of parkinsonian marmosets and that D1 stimulation alone is not sufficient to overcome the akinesia induced by MPTP treatment.
Publication types
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Research Support, Non-U.S. Gov't
MeSH terms
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1-Methyl-4-phenyl-1,2,3,6-tetrahydropyridine
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2,3,4,5-Tetrahydro-7,8-dihydroxy-1-phenyl-1H-3-benzazepine
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Animals
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Antiparkinson Agents*
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Benzazepines / therapeutic use*
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Callitrichinae
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Ergolines / therapeutic use*
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Female
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Male
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Parkinson Disease, Secondary / chemically induced
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Parkinson Disease, Secondary / drug therapy*
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Pyridines / antagonists & inhibitors*
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Quinpirole
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Receptors, Dopamine / drug effects
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Receptors, Dopamine D1
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Receptors, Dopamine D2
Substances
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Antiparkinson Agents
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Benzazepines
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Ergolines
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Pyridines
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Receptors, Dopamine
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Receptors, Dopamine D1
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Receptors, Dopamine D2
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Quinpirole
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2,3,4,5-Tetrahydro-7,8-dihydroxy-1-phenyl-1H-3-benzazepine
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1-Methyl-4-phenyl-1,2,3,6-tetrahydropyridine