More than a third of approved pharmaceutical drugs target G protein-coupled receptors (GPCRs). One receptor belonging to this family, GPR139, is highly expressed in the habenula -- a brain region with

a critical role in addiction.

Olivier George and colleagues used a rat model of alcohol dependence and a substance that activates GPR139 to establish a previously unknown role for the receptor in addiction-like behavior. The researchers found that activation of GPR139 reduced alcohol intake and restored pain sensitivity thresholds only in alcohol-dependent mice that showed compulsive-like alcohol consumption akin to problematic drinking in humans.

This study is the first to establish an effect of GPR139 manipulation on behavior and encourages investigation of the receptor as a potential drug target in the development of medications for alcohol dependence.