Optical Control of GABAA Receptors with a Fulgimide-Based Potentiator.

Optogenetic and photopharmacological tools to manipulate neuronal inhibition have limited efficacy and reversibility. We report the design, synthesis, and biological evaluation of Fulgazepam, a fulgimide derivative of benzodiazepine that behaves as a pure potentiator of ionotropic gamma-aminobutyric acid receptors (GABA A Rs) and displays full and reversible photoswitching in vitro and in vivo . The compound enables high-resolution studies of GABAergic neurotransmission, and phototherapies based on localized, acute, and reversible neuroinhibition.