AUTHOR=Gossman Kyle Richard , Lowe Camryn Serra , Kirckof Adrianna , Vanmeerhaeghe Sydney , Smith Adam Steven 

TITLE=Corticotropin-releasing factor and GABA in the ventral tegmental area modulate partner preference formation in male and female prairie voles (Microtus ochrogaster)

JOURNAL=Frontiers in Neuroscience

VOLUME=18

YEAR=2024

URL=https://www.frontiersin.org/journals/neuroscience/articles/10.3389/fnins.2024.1430447

DOI=10.3389/fnins.2024.1430447

ISSN=1662-453X

ABSTRACT=<sec><title>Introduction</title><p>The mesolimbic reward system is associated with the promotion and rewarding benefits of social relationships. In the socially monogamous prairie vole (<italic>Microtus ochrogaster</italic>), the establishment of a pair bond can be displayed by a robust preference for a breeding partner and aggressive rejection of unfamiliar conspecifics. Mesolimbic dopamine signaling influences bond-related behaviors within the vole through dopamine transmission and receptor activity in the nucleus accumbens. However, only one experiment has examined how the ventral tegmental area (VTA), a region that produces much of the fore- and mid-brain dopamine, regulates these social behaviors. Specifically, inhibition of either glutamate or GABA neurons in the VTA during a brief courtship promoted a partner preference formation in male prairie voles. The VTA is a heterogeneous structure that contains dopamine, GABA, and glutamate neurons as well as receives a variety of projections including corticotropin-releasing factor (CRF) suggested to modulate dopamine release.</p></sec><sec><title>Methods</title><p>We used pharmacological manipulation to examine how GABA and CRF signaling in the VTA modulate partner preference formation in male and female prairie voles. Specifically, we used a 3 h partner preference test, a social choice test, to assess the formation of a partner preference following an infused bicuculline and CRF during a 1 h cohabitation and muscimol and CP154526, a CRFR1 antagonist, during a 24 h cohabitation with an opposite-sex conspecific.</p></sec><sec><title>Results</title><p>Our study demonstrated that bicuculline, a GABA<sub><italic>A</italic></sub> receptor antagonist, and CRF in the VTA promoted a partner preference, whereas low-dose muscimol, a GABA<sub><italic>A</italic></sub> receptor agonist, and CP154526, a CRFR1 antagonist, inhibited a partner preference in both male and female prairie voles.</p></sec><sec><title>Conclusion</title><p>This study demonstrated that GABA and CRF inputs into the VTA is necessary for the formation of a partner preference in male and female prairie voles.</p></sec>