Back to Search
Start Over
TC-8831, a nicotinic acetylcholine receptor agonist, reduces l-DOPA-induced dyskinesia in the MPTP macaque.
- Source :
-
Neuropharmacology . Oct2013, Vol. 73, p337-347. 11p. - Publication Year :
- 2013
-
Abstract
- Abstract: Long-term l-DOPA treatment for Parkinson's disease (PD) is limited by motor complications, particularly l-DOPA-induced dyskinesia (LID). A therapy with the ability to ameliorate LID without reducing anti-parkinsonian benefit would be of great value. We assessed the ability of TC-8831, an agonist at nicotinic acetylcholine receptors (nAChR) containing α6β2/α4β2 subunit combinations, to provide such benefits in 1-methyl-4-phenyl-1,2,3,6-tetrahydropyridine- (MPTP) lesioned macaques with established LID. Animals were treated orally for consecutive 14-day periods with twice-daily vehicle (weeks 1–2) or TC-8831 (0.03, 0.1 or 0.3 mg/kg, weeks 3–8). l-DOPA was also administered, once-daily, (weeks 1–12, median-dose 30 mg/kg, p.o.). For the following two-weeks (weeks 9–10), TC-8831 was washed out, while once-daily l-DOPA treatment was maintained. The effects of once-daily amantadine (3 mg/kg, p.o.) were then assessed over weeks 11–12. LID, parkinsonism, duration and quality of ON-time were assessed weekly by a neurologist blinded to treatment. TC-8831 reduced the duration of ‘bad’ ON-time (ON-time with disabling dyskinesia) by up to 62% and decreased LID severity (median score 18 cf. 34 (vehicle), 0.1 mg/kg, 1–3 h period). TC-8831 also significantly reduced choreiform and dystonic dyskinesia (median scores 6 and 31 cf. 19 and 31 respectively (vehicle), both 0.03 mg/kg, 1–3 h). At no time did TC-8831 treatment result in a reduction in anti-parkinsonian benefit of l-DOPA. By comparison, amantadine also significantly reduced dyskinesia and decreased ‘bad’ ON-time (up to 61%) but at the expense of total ON-time (reduced by up to 23%). TC-8831 displayed robust anti-dyskinetic actions and improved the quality of ON-time evoked by l-DOPA without any reduction in anti-parkinsonian benefit. [Copyright &y& Elsevier]
Details
- Language :
- English
- ISSN :
- 00283908
- Volume :
- 73
- Database :
- Academic Search Index
- Journal :
- Neuropharmacology
- Publication Type :
- Academic Journal
- Accession number :
- 90106570
- Full Text :
- https://doi.org/10.1016/j.neuropharm.2013.06.005