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Monoamine oxidase A inhibition with moclobemide enhances the anti-parkinsonian effect of L-DOPA in the MPTP-lesioned marmoset

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Abstract

Whereas monoamine oxidase (MAO) type B inhibitors are used as adjunct to L-3,4-dihydroxyphenylalanine (L-DOPA) in the treatment of Parkinson’s disease (PD), the enzyme MAO type A (MAO-A) also participates in the metabolism of dopamine in the human and primate striatum. Here, we sought to assess the effect of the selective reversible MAO-A inhibitor moclobemide on L-DOPA anti-parkinsonian in the gold standard animal model of PD, the 1-methyl-4-phenyl-1,2,3,6-tetrahydropyridine (MPTP)-lesioned primate. We also assessed the effect of moclobemide on L-DOPA-induced dyskinesia and psychosis-like behaviours (PLBs). Experiments were performed in six MPTP-lesioned marmosets chronically treated with L-DOPA and exhibiting stable dyskinesia and PLBs upon each administration. In a randomised within-subject design, animals were administered a therapeutic dose of L-DOPA in combination with moclobemide (0.1, 1 and 10 mg/kg) or its vehicle, after which the severity of parkinsonism, dyskinesia, and PLBs was rated by an experienced blinded rater. Moclobemide significantly reduced the global parkinsonian disability (− 36% with 0.1 mg/kg, P < 0.05; − 38% with 1 mg/kg, P < 0.01; − 47% with 10 mg/kg, P < 0.01), when compared with its vehicle. This reduction of parkinsonism was not accompanied by an exacerbation of dyskinesia or PLBs. Reversible MAO-A inhibition with moclobemide appears as an effective way to increase the anti-parkinsonian action of L-DOPA, without negatively affecting dyskinesia or dopaminergic psychosis.

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Funding

PH has research support from Parkinson Canada, Fonds de Recherche Québec–Santé, the Weston Brain Institute, the Michael J Fox Foundation for Parkinson’s Research, the Natural Sciences and Engineering Research Council of Canada and Healthy Brains for Healthy Lives.

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AH, SN, JC and PH conceived and designed research. AH, SN, CK, IF, DB and JC conducted experiments. PH analysed data. PH wrote the manuscript. All authors read and approved the manuscript.

The authors declare that all data were generated in-house and that no paper mill was used.

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Correspondence to Philippe Huot.

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The authors declare that they have no conflict of interest.

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Experiments were approved by McGill University and the Montreal Neurological Institute Animal Care Committees, which are in accordance with the regulations defined by the Canadian Council on Animal Care.

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Hamadjida, A., Nuara, S.G., Kwan, C. et al. Monoamine oxidase A inhibition with moclobemide enhances the anti-parkinsonian effect of L-DOPA in the MPTP-lesioned marmoset. Naunyn-Schmiedeberg's Arch Pharmacol 393, 2157–2164 (2020). https://doi.org/10.1007/s00210-020-01933-y

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  • DOI: https://doi.org/10.1007/s00210-020-01933-y

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