title: Reversal potentials of color opponent responses in horizontal cells of the carp retina.
abstract: Reversal potentials of color opponent responses were measured in H2 and H3 horizontal cells of the carp using Ca2+ action potential method. All responses reversed around -5 mV, suggesting that the ionic mechanisms of light responses are common among all types of horizontal cells. Glutamate-induced depolarizations in H2 and H3 cells had the same reversal potentials as those of light responses, consistent with the idea that these cells receive glutamate-mediated inputs from the cones. Simultaneous recordings showed that depolarization of H1 cells by Ca2+ action potential was transmitted to H2 cells in sign-inverted manner through a negative feedback interposed between these cells.
authors.affiliation: Department of Physiology, Keio University School of Medicine, Tokyo, Japan.
authors.forename: K
authors.initials: K
authors.lastname: Takahashi
authors.forename: M
authors.initials: M
authors.lastname: Murakami
mesh_terms: D000200:Action Potentials / Q000187:drug effects; D000818:Animals; D001224:Aspartic Acid / Q000494:pharmacology; D002118:Calcium / Q000502:physiology; D015220:Calcium Channels / Q000502:physiology; D002347:Carps / Q000502:physiology*; D003118:Color Perception / Q000502:physiology*; D005971:Glutamates / Q000494:pharmacology; D066298:In Vitro Techniques; D008564:Membrane Potentials / Q000187:drug effects; D012160:Retina / Q000502:physiology*; D013569:Synapses / Q000502:physiology
chemical_list: D015220:Calcium Channels; D005971:Glutamates; D001224:Aspartic Acid; D002118:Calcium