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. 1978 Oct;75(10):5205-9.
doi: 10.1073/pnas.75.10.5205.

L-aspartate: evidence for a role in cone photoreceptor synaptic transmission in the carp retina

S M Wu, J E Dowling

L-aspartate: evidence for a role in cone photoreceptor synaptic transmission in the carp retina

S M Wu et al. Proc Natl Acad Sci U S A. 1978 Oct.

Abstract

A number of putative neurotransmitter substances and their antagonists were applied to the carp retina while intracellular recordings from L-type cone horizontal cells were made. Of all the substances tested, L-aspartate was found to be the most potent agent in depolarizing these horizontal cells in dark-adapted, partially light-adapted, and Co2+-treated retinas. Furthermore, DL-alpha-aminoadipate, an L-aspartate antagonist, blocked the effects of both the endogenous photoreceptor transmitter and exogenously applied L-aspartate on the horizontal cells. The results suggest that L-aspartate and the natural transmitter interact with the same population of postsynaptic receptors in the horizontal cell membrane.

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