Effects of the Dopamine Stabilizer, Pridopidine, on Basal and Phencyclidine-Induced Locomotion: Role of Dopamine D2 and Sigma-1 Receptors

Author(s): Kristoffer Sahlholm*, Marta Valle-Leon, Jaume Taura, Victor Fernandez-Duenas, Francisco Ciruela*.

Journal Name: CNS & Neurological Disorders - Drug Targets

Volume 17 , Issue 7 , 2018

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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.

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Article Details

VOLUME: 17
ISSUE: 7
Year: 2018
Page: [522 - 527]
Pages: 6
DOI: 10.2174/1871527317666180627103337
Price: $58

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