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Anti-parkinsonian and anti-dyskinetic profiles of two novel potent and selective nociceptin/orphanin FQ receptor agonists

Arcuri, Ludovico, Novello, Salvatore, Frassineti, Martina, Mercatelli, Daniela, Pisano, Clarissa Anna, Morella, Ilaria ORCID:, Fasano, Stefania ORCID:, Journigan, Blair V., Meyer, Michael E., Polgar, Willma E., Brambilla, Riccardo ORCID:, Zaveri, Nurulain T. and Morari, Michele 2018. Anti-parkinsonian and anti-dyskinetic profiles of two novel potent and selective nociceptin/orphanin FQ receptor agonists. British Journal of Pharmacology 175 (5) , pp. 782-796. 10.1111/bph.14123

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Background and Purpose We previously showed that nociceptin/orphanin FQ opioid peptide (NOP) receptor agonists attenuate the expression of levodopa-induced dyskinesia in animal models of Parkinson's disease. We now investigate the efficacy of two novel, potent and chemically distinct NOP receptor agonists, AT-390 and AT-403, to improve Parkinsonian disabilities and attenuate dyskinesia development and expression. Experimental Approach Binding affinity and functional efficacy of AT-390 and AT-403 at the opioid receptors were determined in radioligand displacement assays and in GTPγS binding assays respectively, conducted in CHO cells. Their anti-Parkinsonian activity was evaluated in 6-hydroxydopamine hemi-lesioned rats whereas the anti-dyskinetic properties were assessed in 6-hydroxydopamine hemi-lesioned rats chronically treated with levodopa. The ability of AT-403 to inhibit the D1 receptor-induced phosphorylation of striatal ERK was investigated. Key Results AT-390 and AT-403 selectively improved akinesia at low doses and disrupted global motor activity at higher doses. AT-403 palliated dyskinesia expression without causing sedation in a narrow therapeutic window, whereas AT-390 delayed the appearance of abnormal involuntary movements and increased their duration at doses causing sedation. AT-403 did not prevent the priming to levodopa, although it significantly inhibited dyskinesia on the first day of administration. AT-403 reduced the ERK phosphorylation induced by SKF38393 in vitro and by levodopa in vivo. Conclusions and Implications NOP receptor stimulation can provide significant albeit mild anti-dyskinetic effect at doses not causing sedation. The therapeutic window, however, varies across compounds. AT-403 could be a potent and selective tool to investigate the role of NOP receptors in vivo.

Item Type: Article
Date Type: Publication
Status: Published
Schools: Neuroscience and Mental Health Research Institute (NMHRI)
Publisher: Wiley: 12 months
ISSN: 0007-1188
Date of First Compliant Deposit: 28 November 2017
Date of Acceptance: 26 November 2017
Last Modified: 11 Apr 2024 16:24

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