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H1 horizontal cells of carp retina have different postsynaptic mechanisms to mediate short-versus long-wavelength visual signals

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Summary

Vertebrate photoreceptors release neuro-transmitter substance(s) tonically in the dark and this release is curtailed by light. Recently, we have become increasingly aware of the possibility that short- and long-wavelength visual signals are mediated differently during the synaptic transmission to second-order retinal neurons. The experiment described here advances this notion further by demonstrating a postsynaptic difference. Treatment of the carp retina by dopamine reduced the gap-junctional coupling of horizontal cells, and we made use of this known effect to measure the input resistance (Rin) of H1-type horizontal cells. Flashes of light increased Rin. This increase, however, was found to be smaller with short wavelengths, even though the comparison was made when voltage responses were equal in amplitude. Often, Rin was even found to decrease at the blue end of spectrum. No single postsynaptic mechanism can account for any equal-voltage Rin difference such as this. The synaptic spectral segregation thus revealed is probably subserved by a dual scheme wherein the transmitter from blue-sensitive cone photoreceptors acts to decrease the membrane conductance of H1 cells whereas the synapses made by red-and green-sensitive cones are of a classical excitatory type.

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Correspondence to S. Yasui.

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Yasui, S., Yamada, M. H1 horizontal cells of carp retina have different postsynaptic mechanisms to mediate short-versus long-wavelength visual signals. Exp Brain Res 74, 256–262 (1989). https://doi.org/10.1007/BF00248858

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Key words

  • Retina
  • Horizontal cell
  • Color vision
  • Synapse
  • Dopamine