Abstract
Background: Pridopidine, a compound in clinical trials for Huntington's disease treatment, was originally synthesized as a dopamine D2 receptor (D2R) ligand, but later found to possess higher affinity for the sigma-1 receptor (S1R). However, the putative contributions of D2R and S1R to the behavioral profile of acutely administered pridopidine have not been investigated.
Objective: The present study sought to compare the effects of acute pridopidine on wild-type vs. D2R and S1R knockout mice, at high (60 mg/kg) and low (6 mg/kg) doses.
Method: Pridopidine effects on basal and phencyclidine-induced locomotor activity was measured in the open field test. Additionally, the actions of pridopidine on prepulse inhibition was measured in animals treated with saline or phencyclidine.
Results: Whereas inhibition of spontaneous and phencyclidine-induced locomotion was readily observed at 60 mg/kg pridopidine, neither locomotor stimulation in habituated mice, nor any effects on prepulse inhibition were detected upon pridopidine treatment. Surprisingly, inhibition of spontaneous locomotion was unaffected by both D2R and S1R deletion.
Conclusion: The present results suggest the involvement of additional targets, besides D2R and S1R, in mediating locomotor inhibition by pridopidine.
Keywords: Sigma-1 receptor, dopamine receptor, knockout mice, phencyclidine, open field, prepulse inhibition.
CNS & Neurological Disorders - Drug Targets
Title:Effects of the Dopamine Stabilizer, Pridopidine, on Basal and Phencyclidine-Induced Locomotion: Role of Dopamine D2 and Sigma-1 Receptors
Volume: 17 Issue: 7
Author(s): Kristoffer Sahlholm*, Marta Valle-Leon, Jaume Taura, Victor Fernandez-Duenas and Francisco Ciruela*
Affiliation:
- Unitat de Farmacologia, Departament Patologia i Terapeutica Experimental, Facultat de Medicina i Ciencies de la Salut, IDIBELL-Universitat de Barcelona, L`Hospitalet de Llobregat, Barcelona,Spain
- Unitat de Farmacologia, Departament Patologia i Terapeutica Experimental, Facultat de Medicina i Ciencies de la Salut, IDIBELL-Universitat de Barcelona, L`Hospitalet de Llobregat, Barcelona,Spain
Keywords: Sigma-1 receptor, dopamine receptor, knockout mice, phencyclidine, open field, prepulse inhibition.
Abstract: Background: Pridopidine, a compound in clinical trials for Huntington's disease treatment, was originally synthesized as a dopamine D2 receptor (D2R) ligand, but later found to possess higher affinity for the sigma-1 receptor (S1R). However, the putative contributions of D2R and S1R to the behavioral profile of acutely administered pridopidine have not been investigated.
Objective: The present study sought to compare the effects of acute pridopidine on wild-type vs. D2R and S1R knockout mice, at high (60 mg/kg) and low (6 mg/kg) doses.
Method: Pridopidine effects on basal and phencyclidine-induced locomotor activity was measured in the open field test. Additionally, the actions of pridopidine on prepulse inhibition was measured in animals treated with saline or phencyclidine.
Results: Whereas inhibition of spontaneous and phencyclidine-induced locomotion was readily observed at 60 mg/kg pridopidine, neither locomotor stimulation in habituated mice, nor any effects on prepulse inhibition were detected upon pridopidine treatment. Surprisingly, inhibition of spontaneous locomotion was unaffected by both D2R and S1R deletion.
Conclusion: The present results suggest the involvement of additional targets, besides D2R and S1R, in mediating locomotor inhibition by pridopidine.
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Cite this article as:
Sahlholm Kristoffer *, Valle-Leon Marta , Taura Jaume , Fernandez-Duenas Victor and Ciruela Francisco *, Effects of the Dopamine Stabilizer, Pridopidine, on Basal and Phencyclidine-Induced Locomotion: Role of Dopamine D2 and Sigma-1 Receptors, CNS & Neurological Disorders - Drug Targets 2018; 17 (7) . https://dx.doi.org/10.2174/1871527317666180627103337
DOI https://dx.doi.org/10.2174/1871527317666180627103337 |
Print ISSN 1871-5273 |
Publisher Name Bentham Science Publisher |
Online ISSN 1996-3181 |
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