Journal of Neuroscience, Vol 3, 1701-1711, Copyright © 1983 by Society for Neuroscience
The role of excitatory amino acid transmitters in the mudpuppy retina: an analysis with kainic acid and N-methyl aspartate
MM Slaughter and RF Miller
A variety of glutamate and aspartate analogues were used to characterize
the excitatory amino acid receptors in the mudpuppy retina. This approach
revealed two general classes of receptors which were represented by the
agonists kainic acid and N-methyl aspartic acid. Kainic acid was found to
be a potent photoreceptor transmitter agonist on all three types of
second-order neurons, and it was a powerful excitant of amacrine and
ganglion cells. N-Methyl aspartate had little effect in the outer retina,
but it had potent stimulatory effects on inner retinal neurons. N-Methyl
aspartate antagonists selectively blocked light responses in some sustained
OFF ganglion cells. These results suggest that both photoreceptors and
bipolar neurons may use glutamate Or an analogue, whereas aspartate may be
utilized by a class of sustained ON amacrine cells.