Antiparkinsonian activity of talipexole in MPTP-treated monkeys: in combination with L-dopa and as chronic treatment.

Abstract

We examined whether or not the antiparkinsonian activity of talipexole (B-HT 920, 6-allyl-2-amino-5,6,7,8-tetrahydro-4H-thiazolo[4,5-d]-azepine) could be optimised by combination with L-3,4-dihydroxyphenylalanine (L-dopa). Additionally, the effects of chronic treatment with talipexole on motor behavior were investigated using 1-methyl-4-phenyl-1,2,3,6-tetrahydropyridine (MPTP)-treated and normal common marmosets. Administration of MPTP (0.5 mg/animal i.v. once or twice) to marmosets induced persistent parkinsonian motor deficits. The antiparkinsonian activity of talipexole (40 micrograms/kg s.c.) was significantly enhanced by its combination with L-dopa (30 mg/kg i.p.). This may further support the postulated postsynaptic dopamine D2 receptor agonist properties of talipexole. Chronic treatment with talipexole (a daily dose of 40 micrograms/kg s.c. for 21 days) did not lead to tolerance to the antiparkinsonian activity in MPTP-treated animals. No obvious dyskinesia was seen throughout the chronic treatment. In contrast, in normal marmosets, talipexole at a dose of 80 micrograms/kg which is a dose sufficient to induce hyperactivity did not increase motor activity during the treatment repeated for 21 days. These results suggest that talipexole is a selective dopamine D2 receptor agonist drug of potential use in the treatment of Parkinson's disease.

• Authors: M Irifune, M Nomoto, T Fukuda
• Journal: European journal of pharmacology (Eur J Pharmacol) Vol. 264 Issue 2 Pg. 117-23 (Oct 24 1994) ISSN: 0014-2999 [Print] Netherlands
• PMID: 7851473 (Publication Type: Comparative Study, Journal Article)

Chemical References

• Antiparkinson Agents
• Azepines
• Dopamine Agonists
• Levodopa
• talipexole
• 1-Methyl-4-phenyl-1,2,3,6-tetrahydropyridine

Topics

• 1-Methyl-4-phenyl-1,2,3,6-tetrahydropyridine (administration & dosage)
• Analysis of Variance
• Animals
• Antiparkinson Agents (administration & dosage, pharmacology, therapeutic use)
• Azepines (administration & dosage, pharmacology, therapeutic use)
• Callithrix
• Disease Models, Animal
• Dopamine Agonists (administration & dosage, pharmacology, therapeutic use)
• Dose-Response Relationship, Drug
• Drug Therapy, Combination
• Female
• Injections, Intraperitoneal
• Injections, Intravenous
• Injections, Subcutaneous
• Levodopa (administration & dosage, pharmacology, therapeutic use)
• MPTP Poisoning
• Male
• Motor Activity (drug effects)
• Parkinson Disease, Secondary (chemically induced, drug therapy)