Abstract
The amino acids L-glutamate and L-aspartate depolarize H1 horizontal cells in the perfused goldfish retina but only at millimolar concentrations. The effects of L-glutamate (but not of L-aspartate) are potentiated approximately 15-fold by exposure to D-aspartate. D-Aspartate blocks acidic amino acid uptake in goldfish retina, so that the potentiation of L-glutamate may be produced by an increase in its effective concentration at the horizontal cell membrane. Because D-aspartate also augments the light responses of horizontal cells, our results are consistent with the possibility that L-glutamate is a neurotransmitter of cone photoreceptors in goldfish.
Full text
PDFSelected References
These references are in PubMed. This may not be the complete list of references from this article.
- Balcar V. J., Johnston G. A. The structural specificity of the high affinity uptake of L-glutamate and L-aspartate by rat brain slices. J Neurochem. 1972 Nov;19(11):2657–2666. doi: 10.1111/j.1471-4159.1972.tb01325.x. [DOI] [PubMed] [Google Scholar]
- CURTIS D. R., PHILLIS J. W., WATKINS J. C. The chemical excitation of spinal neurones by certain acidic amino acids. J Physiol. 1960 Mar;150:656–682. doi: 10.1113/jphysiol.1960.sp006410. [DOI] [PMC free article] [PubMed] [Google Scholar]
- Cervetto L., MacNichol E. F., Jr Inactivation of horizontal cells in turtle retina by glutamate and aspartate. Science. 1972 Nov 17;178(4062):767–768. doi: 10.1126/science.178.4062.767. [DOI] [PubMed] [Google Scholar]
- Dowling J. E., Ripps H. Adaptation in skate photoreceptors. J Gen Physiol. 1972 Dec;60(6):698–719. doi: 10.1085/jgp.60.6.698. [DOI] [PMC free article] [PubMed] [Google Scholar]
- Ehinger B., Falck B. Autoradiography of some suspected neurotransmitter substances: GABA glycine, glutamic acid, histamine, dopamine, and L-dopa. Brain Res. 1971 Oct 8;33(1):157–172. doi: 10.1016/0006-8993(71)90314-3. [DOI] [PubMed] [Google Scholar]
- Fagg G. E., Lane J. D. The uptake and release of putative amino acid neurotransmitters. Neuroscience. 1979;4(8):1015–1036. doi: 10.1016/0306-4522(79)90185-4. [DOI] [PubMed] [Google Scholar]
- Hashimoto Y., Kato A., Inokuchi M., Watanabe K. Re-examination of horizontal cells in the carp retina with procion yellow electrode. Vision Res. 1976 Jan;16(1):25–29. doi: 10.1016/0042-6989(76)90072-9. [DOI] [PubMed] [Google Scholar]
- Hertz L. Functional interactions between neurons and astrocytes I. Turnover and metabolism of putative amino acid transmitters. Prog Neurobiol. 1979;13(3):277–323. doi: 10.1016/0301-0082(79)90018-2. [DOI] [PubMed] [Google Scholar]
- Johnson J. L. The excitant amino acids glutamic and aspartic acid as transmitter candidates in the vertebrate central nervous system. Prog Neurobiol. 1978;10(3):155–202. doi: 10.1016/0301-0082(78)90002-3. [DOI] [PubMed] [Google Scholar]
- KRNJEVIC K., PHILLIS J. W. Iontophoretic studies of neurones in the mammalian cerebral cortex. J Physiol. 1963 Feb;165:274–304. doi: 10.1113/jphysiol.1963.sp007057. [DOI] [PMC free article] [PubMed] [Google Scholar]
- Kaneko A. Physiological and morphological identification of horizontal, bipolar and amacrine cells in goldfish retina. J Physiol. 1970 May;207(3):623–633. doi: 10.1113/jphysiol.1970.sp009084. [DOI] [PMC free article] [PubMed] [Google Scholar]
- Kaneko A., Shimazaki H. Synaptic transmission from photoreceptors to bipolar and horizontal cells in the carp retina. Cold Spring Harb Symp Quant Biol. 1976;40:537–546. doi: 10.1101/sqb.1976.040.01.050. [DOI] [PubMed] [Google Scholar]
- Murakami M., Otsu K., Otsuka T. Effects of chemicals on receptors and horizontal cells in the retina. J Physiol. 1972 Dec;227(3):899–913. doi: 10.1113/jphysiol.1972.sp010065. [DOI] [PMC free article] [PubMed] [Google Scholar]
- Stell W. K., Lightfoot D. O. Color-specific interconnections of cones and horizontal cells in the retina of the goldfish. J Comp Neurol. 1975 Feb 15;159(4):473–502. doi: 10.1002/cne.901590404. [DOI] [PubMed] [Google Scholar]
- White R. D., Neal M. J. The uptake of L-glutamate by the retina. Brain Res. 1976 Jul 23;111(1):79–93. doi: 10.1016/0006-8993(76)91050-7. [DOI] [PubMed] [Google Scholar]
- Wu S. M., Dowling J. E. L-aspartate: evidence for a role in cone photoreceptor synaptic transmission in the carp retina. Proc Natl Acad Sci U S A. 1978 Oct;75(10):5205–5209. doi: 10.1073/pnas.75.10.5205. [DOI] [PMC free article] [PubMed] [Google Scholar]