Effect of memantine on L-DOPA-induced dyskinesia in the 6-OHDA-lesioned rat model of Parkinson's disease.
An increasing body of experimental evidence demonstrates that the glutamatergic system is involved in the genesis of l-3,4-dihydroxyphenylalanine (L-DOPA)-induced dyskinesia (LID). Indeed, the N-methyl-d-aspartate (NMDA) receptor antagonist amantadine is the only anti-dyskinetic compound used in patients, albeit with limited efficacy and side effects. In this study, we investigated the anti-dyskinetic properties of memantine, a non-competitive NMDA receptor antagonist in clinical use for the treatment of dementia, in the 6-hydroxy-dopamine (6-OHDA)-lesion rat model of Parkinson's disease. For comparison, parallel experiments were also performed with amantadine. First, we investigated the acute effect of different doses of memantine (5, 10, 15 and 20mg/kg), and amantadine (10, 20, 40, 60mg/kg) on established dyskinesia induced by L-DOPA (6mg/kg plus benserazide). Results showed that both memantine and amantadine produced a significant reduction of LID. Afterward, drug-naïve and L-DOPA-primed 6-OHDA-lesioned rats were sub-chronically treated with daily injections of L-DOPA (6mg/kg plus benserazide) alone, or in combination with the effective doses of memantine, while amantadine was tested in already dyskinetic rats. Results showed that memantine significantly dampened dyskinesia in both drug-naïve and L-DOPA-primed rats, but only during the first few days of administration. In fact, the anti-dyskinetic effect of memantine was completely lost already at the fifth administration, indicating a rapid induction of tolerance. Interestingly, a 3-week washout period was not sufficient to restore the anti-dyskinetic effect of the drug. Similarly, amantadine was able to dampen already established dyskinesia only during the first day of administration. Moreover, memantine partially decreased the therapeutic effect of L-DOPA, as showed by the result of the stepping test. Finally, loss of the anti-dyskinetic effect of memantine was associated to increased synaptic GluN2A/GluN2B ratio at striatal synaptic membranes. Our results are in line with clinical observations suggesting that NMDA receptor blockade may only be transiently effective against LID in PD patients.
Department of Biomedical Sciences, University of Cagliari, Cittadella Universitaria, SS554, km 4.5, 09042 Monserrato, Italy. Electronic address: elitronci@yahoo.it.
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Tronci
Department of Biomedical Sciences, University of Cagliari, Cittadella Universitaria, SS554, km 4.5, 09042 Monserrato, Italy.
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Fidalgo
DiSFeB, Dipartimento di Scienze Farmacologiche e Biomolecolari, Università degli Studi di Milano, Milano, Italy.
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Zianni
Department of Biomedical Sciences, University of Cagliari, Cittadella Universitaria, SS554, km 4.5, 09042 Monserrato, Italy.
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Collu
Department of Biomedical Sciences, University of Cagliari, Cittadella Universitaria, SS554, km 4.5, 09042 Monserrato, Italy.
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Stancampiano
Department of Biomedical Sciences, University of Cagliari, Cittadella Universitaria, SS554, km 4.5, 09042 Monserrato, Italy.
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Morelli
DiSFeB, Dipartimento di Scienze Farmacologiche e Biomolecolari, Università degli Studi di Milano, Milano, Italy.
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Gardoni
Department of Biomedical Sciences, University of Cagliari, Cittadella Universitaria, SS554, km 4.5, 09042 Monserrato, Italy.
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Carta
D000547:Amantadine / Q000008:administration & dosage / Q000627:therapeutic use; D000818:Animals; D000978:Antiparkinson Agents / Q000633:toxicity*; D004195:Disease Models, Animal; D020820:Dyskinesias / Q000188:drug therapy*; D018691:Excitatory Amino Acid Antagonists / Q000008:administration & dosage / Q000627:therapeutic use*; D007980:Levodopa / Q000633:toxicity*; D008297:Male; D008559:Memantine / Q000008:administration & dosage / Q000627:therapeutic use*; D016627:Oxidopamine; D010302:Parkinson Disease, Secondary / Q000139:chemically induced; D051381:Rats; D017207:Rats, Sprague-Dawley
D000978:Antiparkinson Agents; D018691:Excitatory Amino Acid Antagonists; D007980:Levodopa; D016627:Oxidopamine; D000547:Amantadine; D008559:Memantine
L-DOPA; NMDA receptor; amantadine; dopamine; dyskinesia; memantine