Abstract
We have synthesized a photosensitive (or caged) 4-carboxymethoxy-5,7-dinitroindolinyl (CDNI) derivative of gamma-aminobutyric acid (GABA). Two-photon excitation of CDNI-GABA produced rapid activation of GABAergic currents in neurons in brain slices with an axial resolution of approximately 2 mum and enabled high-resolution functional mapping of GABA-A receptors. Two-photon uncaging of GABA, the main inhibitory neurotransmitter, should allow detailed studies of receptor function and synaptic integration with subcellular precision.
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