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- W2016199210 abstract "Primate retinas contain two major ganglion cell types. Midget (or P type) cells have relatively sustained responses to light; the amplitude and polarity of these responses vary with stimulus wavelength. Parasol (or M type) cells are more sensitive to stimulus contrast and respond more transiently but are not selective for color. Both types can be further subdivided into a and b subtypes, according to the level of their dendritic stratification in the inner plexiform layer. To determine whether differences in receptors for amino acid transmitters are the basis for any differences in ganglion cell light responses, we made whole-cell, patch-clamp recordings from identified ganglion cells in slice preparations of macaque and baboon retinas. We found that midget and parasol cells of both a and b types had similar responses to excitatory amino acids, including kainate, alpha-amino-3-hydroxy-5-methylisoxalzole-4-propionic acid, and N-methyl-D-aspartate, with reversal potentials near the equilibrium potential for cations. Kainate responses were blocked by 6,7-dinitroquinoxaline, and N-methyl-D-aspartate responses were blocked by D-(-)-2-amino-7-phosphonoheptanoic acid. The four types of ganglion cells also had similar responses to bath-applied inhibitory amino acids. All cells had both gamma-aminobutyric acid and glycine receptors with reversal potentials near the equilibrium potential for Cl-, and the relative amplitudes of the responses to excitatory and inhibitory amino acids were similar among the various cell types. These results suggest that the differences in response properties of the different classes of ganglion cells in primate retina may be determined, to a significant degree, by the properties of the amacrine and bipolar cells that provide their input rather than by the nature of their postsynaptic receptors." @default.
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- W2016199210 date "1994-05-24" @default.
- W2016199210 modified "2023-09-25" @default.
- W2016199210 title "Amino acid receptors of midget and parasol ganglion cells in primate retina." @default.
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- W2016199210 doi "https://doi.org/10.1073/pnas.91.11.4907" @default.
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