Systemic administration of an mGluR5 antagonist, but not unilateral subthalamic lesion, counteracts l-DOPA-induced dyskinesias in a rodent model of Parkinson's disease

• Main Authors: Giovanna Levandis, Eleonora Bazzini, Marie-Thérèse Armentero, Giuseppe Nappi, Fabio Blandini
• Format: Article
• Language: English
• Published: Elsevier 2008-01-01
• Series: Neurobiology of Disease
• Online Access: http://www.sciencedirect.com/science/article/pii/S0969996107001945

Altered glutamatergic neurotransmission is central to the expression of Parkinson's disease (PD) symptoms and may underlie l-DOPA-induced dyskinesias. Drugs acting on glutamate metabotropic receptors (mGluR) of group I can modulate subthalamic nucleus (STN) overactivity, which plays a pivotal role in these phenomena, and may counteract dyskinesias. To address these issues, we investigated the effects of a 3-week treatment with mGluR5 antagonist 2-methyl-6-(phenylethynyl)-pyridine (MPEP), or of a subthalamic lesion, on abnormal involuntary movements (AIMs) and associated striatal expression of transcription factor FosB/Delta FosB caused by chronic l-DOPA administration, in rats with a nigrostriatal lesion. MPEP virtually abolished AIMs and reduced, dramatically, striatal expression of FosB/Delta FosB. Reduced FosB/Delta FosB expression, coupled with nonsignificant reduction of AIMs, was also observed in STN-lesioned rats. Our data confirm the role of glutamatergic neurotransmission in the pathogenesis of dyskinesias and the potential of mGluR5 antagonists in the treatment of l-DOPA-induced dyskinesias.