Immunocytochemical and autoradiographic localization of GABA system in the vertebrate retina
Molecular and Cellular Biochemistry, ISSN: 0300-8177, Vol: 39, Issue: 1, Page: 229-238
1981
- 44Citations
- 6Captures
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Metrics Details
- Citations44
- Citation Indexes44
- 44
- CrossRef41
- Captures6
- Readers6
Article Description
The localization of γ-aminobutyric acid (GABA) neurons in the goldfish and the rabbit retina has been studied by immunocytochemical localization of the GABA-synthesizing enzyme L-glutamate decarboxylase (GAD, L-glutamate 1-carboxy-lase, EC 4.1.1.15) and by [H] GABA uptake autoradiography. In the goldfish retina, GAD is localized in some horizontal cells (H1 type), a few amacrine cells and sublamina b of the inner plexiform layer. Results from immunocytochemical studies of GAD-containing neurons and autoradiographic studies of GABA uptake reveals a marked similarity in the labeling pattern suggesting that in goldfish retina, the neurons which possess a high-affinity system for GABA uptake also contain significant levels of GAD. In the rabbit retina, when Triton X-100 was included in immunocytochemical incubations with a modified protein A-peroxidase-antiperoxidase method, reaction product was found in four broad, evenly spaced laminae within the inner plexiform layer. In the absence of the detergent, these laminae were seen to be composed of small, punctate deposits. When colchicine was injected intravitreally before glutamate decarboxylase staining, cell bodies with the characteristic shape and location of amacrine cells were found to be immunochemically labeled. Electron microscopic examination showed that these processes were presynaptic to ganglion cell dendrites (infrequently), amacrine cell telodendrons, and bipolar cell terminals. Often, bipolar cell terminals were found which were densely innervated by several GAD-positive processes. No definite synapses were observed in which a GAD-positive process represented the postsynaptic element. In autoradiographic studies by intravitreal injection of [H] GABA a diffuse labeling of the inner plexiform layer and a dense labeling of certain amacrine cell bodies in the inner nuclear layer was observed. Both immunocytochemical and autoradiographic results support the notion that certain, if not all, amacrine cells use GABA as their neurotransmitter. © 1981 Martinus Nijhoff/Dr W. Junk Publishers.
Bibliographic Details
http://www.scopus.com/inward/record.url?partnerID=HzOxMe3b&scp=0019731732&origin=inward; http://dx.doi.org/10.1007/bf00232576; http://www.ncbi.nlm.nih.gov/pubmed/7031461; http://link.springer.com/10.1007/BF00232576; http://www.springerlink.com/index/pdf/10.1007/BF00232576; https://dx.doi.org/10.1007/bf00232576; https://link.springer.com/article/10.1007/BF00232576; http://www.springerlink.com/index/10.1007/BF00232576
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