An Emerging Circuit Pharmacology of GABA Receptors.

In the past 20 years we have learned a great deal about GABA receptor (GABAR) subtypes, and which behaviors are regulated or which drug effects are mediated by each subtype. However, the question of where GABARs involved in specific drug effects and behaviors are located in the brain remains largely unanswered. We review here recent studies taking a circuit pharmacology approach to investigate the functions of GABAR subtypes in specific brain circuits controlling fear, anxiety, learning, memory, reward, addiction, and stress-related behaviors. The findings of these studies highlight the complexity of brain inhibitory systems and the importance of taking a subtype-, circuit-, and neuronal population-specific approach to develop future therapeutic strategies using cell type-specific drug delivery.