|Title||Contribution of brain serotonin subtype 1B receptors in levodopa-induced motor complications.|
|Publication Type||Journal Article|
|Year of Publication||2015|
|Auteurs||Morin, N, Morissette, M, Grégoire, L, Rajput, A, Rajput, AH, Di Paolo, T|
|Date Published||2015 Dec|
|Keywords||Aged, Aged, 80 and over, Animals, Antiparkinson Agents, Brain, Dyskinesia, Drug-Induced, Excitatory Amino Acid Antagonists, Female, Humans, Levodopa, Macaca fascicularis, Male, MPTP Poisoning, Ovariectomy, Parkinson Disease, Pyridines, Receptor, Metabotropic Glutamate 5, Receptor, Serotonin, 5-HT1B|
L-DOPA-induced dyskinesias (LID) are abnormal involuntary movements limiting the chronic use of L-DOPA, the main pharmacological treatment of Parkinson's disease. Serotonin receptors are implicated in the development of LID and modulation of basal ganglia 5-HT1B receptors is a potential therapeutic alternative in Parkinson's disease. In the present study, we used receptor-binding autoradiography of the 5-HT1B-selective radioligand [3H]GR125743 to investigate possible contributions of changes in ligand binding of this receptor in LID in post-mortem brain specimens from Parkinson's disease patients (n=14) and control subjects (n=11), and from 1-methyl-4-phenyl-1,2,3,6-tetrahydropyridine (MPTP)-lesioned monkeys treated with saline (n=5), L-DOPA (n=4) or L-DOPA+2-methyl-6-(phenylethynyl)pyridine (MPEP) (n=5), and control monkeys (n=4). MPEP is the prototypal metabotropic glutamate 5 (mGlu5) receptor antagonist and has been shown to reduce the development of LID in these monkeys in a chronic treatment of one month. [3H]GR125743 specific binding to striatal and pallidal 5-HT1B receptors respectively were only increased in L-DOPA-treated MPTP monkeys (dyskinetic monkeys) as compared to controls, saline and L-DOPA+MPEP MPTP monkeys; dyskinesias scores correlated positively with this binding. Parkinson's disease patients with motor complications (L-DOPA-induced dyskinesias and wearing-off) had higher [3H]GR125743 specific binding compared to those without motor complications and controls in the basal ganglia. Reduction of motor complications was associated with normal striatal 5-HT1B receptors, suggesting the potential of this receptor for the management of motor complications in Parkinson's disease.
|Grant List||MOP-114916 / / Canadian Institutes of Health Research / Canada|