PT150 blocks the rewarding properties of ethanol and attenuates ethanol-induced reduction of egg laying in Coturnix quail.

RATIONALE

Alcohol use disorder (AUD) has been shown to be associated with a dysregulated stress system. Reducing the stress hormone corticosterone (CORT), that binds to glucocorticoid receptors, may attenuate the rewarding properties of drugs of abuse. However, the effect of blocking corticosterone receptors on ethanol reward has yet to be investigated.

OBJECTIVES

The current study investigated whether the stress hormone receptor antagonist, PT150, would block the rewarding properties of ethanol via the glucocorticoid receptor system and attenuate other ethanol-induced effects.

METHODS

A conditioned place preference (CPP) procedure was used to examine the rewarding properties of ethanol in an avian preclinical model. Ethanol was paired with the least preferred chamber. On alternate days, water was paired with the preferred chamber. After eight pairings, a place preference test was given that allowed subjects to have access to both chambers. Half of the subjects received PT150 prior to ethanol administration. The other half received vehicle. Time spent in each chamber during the preference tests, locomotor activity during the pairings, and egg production in female birds was recorded.

RESULTS

Ethanol treatment resulted in a CPP and pretreatment of PT150 blocked the acquisition of the ethanol-induced place preference. Neither ethanol nor PT150 altered locomotor activity. Pretreatment of PT150 also increased egg production in female quail treated with ethanol.

CONCLUSIONS

These findings suggest repeated ethanol pairings with visual cues can produce a CPP. Furthermore, pretreatment of PT150 may be a potential pharmacotherapy for blocking the rewarding properties of ethanol and may enhance egg production in female quail treated with ethanol.