title: GABAergic neurotransmission and retinal ganglion cell function.
abstract: Ganglion cells are the output retinal neurons that convey visual information to the brain. There are ~20 different types of ganglion cells, each encoding a specific aspect of the visual scene as spatial and temporal contrast, orientation, direction of movement, presence of looming stimuli; etc. Ganglion cell functioning depends on the intrinsic properties of ganglion cell's membrane as well as on the excitatory and inhibitory inputs that these cells receive from other retinal neurons. GABA is one of the most abundant inhibitory neurotransmitters in the retina. How it modulates the activity of different types of ganglion cells and what is its significance in extracting the basic features from visual scene are questions with fundamental importance in visual neuroscience. The present review summarizes current data concerning the types of membrane receptors that mediate GABA action in proximal retina; the effects of GABA and its antagonists on the ganglion cell light-evoked postsynaptic potentials and spike discharges; the action of GABAergic agents on centre-surround organization of the receptive fields and feature related ganglion cell activity. Special emphasis is put on the GABA action regarding the ON-OFF and sustained-transient ganglion cell dichotomy in both nonmammalian and mammalian retina.
authors: Department of Physiology, Medical Faculty, Medical University, 1431, Sofia, Bulgaria, epopova@abv.bg.
authors: E
authors: E
authors: Popova
mesh_terms: D000818:Animals; D018756:GABA Antagonists / Q000494:pharmacology; D059330:GABAergic Neurons / Q000187:drug effects / Q000378:metabolism*; D006801:Humans; D008027:Light; D055537:Light Signal Transduction; D010775:Photic Stimulation; D018079:Receptors, GABA / Q000378:metabolism; D012165:Retinal Ganglion Cells / Q000187:drug effects / Q000378:metabolism*; D055366:Synaptic Potentials; D009435:Synaptic Transmission / Q000187:drug effects; D005680:gamma-Aminobutyric Acid / Q000378:metabolism*
chemical_list: D018756:GABA Antagonists; D018079:Receptors, GABA; D005680:gamma-Aminobutyric Acid
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