Title

CNS Region-specific Oxytocin Receptor Expression: Importance in Regulation of Anxiety and Sex Behavior

Document Type

Article

Publication Date

4-1-2001

Version

Publisher's PDF

Publication Title

The Journal of Neuroscience

Keywords

oxytocin receptor, oxytocin, OTR, anxiety, sex behaviors, rats, dopamine, central nucleus amygdala, cAmyg, kinase A

Subject Categories

Biology

Abstract

The oxytocin receptor (OTR) is differentially expressed in the CNS. Because there are multiple mechanisms by which the OTR can be transcriptionally induced, we hypothesized that differences in OTR expression may be explained by activation of distinct signal transduction pathways and may be critical for the control of anxiety and sex behaviors. To determine the regulation and functional significance of this expression, we infused female rats with modifiers of protein kinases before assaying for behavior and oxytocin receptor binding. In the ventromedial nucleus of the hypothalamus (VMH), estrogen-dependent induction of oxytocin receptors required protein kinase C activation, and oxytocin infused here promoted female sex behavior but had no effect on anxiety. In contrast, dopamine controlled tonic oxytocin receptor expression in the central nucleus of the amygdala (cAmyg) through activation of protein kinase A, and oxytocin infused here was anxiolytic but had no effect on female sex behavior. Therefore, we have identified brain region-specific regulation of the OTR in the VMH and cAmyg. Distinct signal transduction pathways regulating receptor expression and binding in each brain region may mediate in part the ability of oxytocin to exert these differential behavioral effects.

Comments

Copyright 2001 The Journal of Neuroscience. The original publication is available at The Journal of Neuroscience.