Effects of systemic 5-HT(1B) receptor compounds on ventral tegmental area intracranial self-stimulation thresholds in rats

European Journal of Pharmacology
Dave J HayesA J Greenshaw

Abstract

Serotonin 1B (5-HT(1B)) receptors may play a role in regulating motivation and reward-related behaviours. To date, no studies have investigated the effects of the highly selective 5-HT(1B) receptor agonist CP 94253, on the reward model of ventral tegmental area intracranial self-stimulation. The current study investigated the hypothesis that 5-HT(1B) receptors play an inhibitory role in ventral tegmental area ICSS. Using Sprague-Dawley rats, the effects of the selective 5-HT(1B) receptor agonist CP 94253 (0-5.0 mg/kg) and the 5-HT(1B/1D) receptor antagonist GR 127935 (10.0 mg/kg) were investigated in rats trained to respond for ventral tegmental area ICSS; results were compared using rate-frequency threshold analysis. The highest dose of CP 94253 (5.0 mg/kg) tested in ventral tegmental area ICSS produced an increase in rate-frequency thresholds without affecting maximal response rates. This effect was attenuated by GR 127935 which did not show any effects when administered alone. These results suggest that 5-HT(1B) receptors play an inhibitory role in regulating ventral tegmental area ICSS.

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Citations

May 12, 2010·Addiction Biology·Małgorzata FilipEdmund Przegaliński
Dec 15, 2010·PloS One·Giovanni HernandezPeter Shizgal
Feb 24, 2012·Pharmacological Reports : PR·Joanna MiszkielEdmund Przegaliński
Jan 30, 2010·Neuroscience·G S KranzR Lanzenberger
Mar 16, 2011·Neuroscience and Biobehavioral Reviews·Dave J Hayes, Andrew J Greenshaw

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