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Localization of GABAA receptors in the rat retina

  • Ursula Greferath (a1), Frank Müller (a1), Heinz Wässle (a1), Brenda Shivers (a2) and Peter Seeburg (a2)...

Gamma-aminobutyric acid (GABA) is the major inhibitory neurotransmitter in the mammalian retina. The present paper describes the localization of GABAA receptors in the rat retina as revealed by in situ hybridization and immunocytochemistry.

In situ hybridization with probes against various a subunits revealed a marked differential expression pattern. The αl subunit gene is expressed mainly in the bipolar and horizontal cell layer, the α2 gene in the amacrine and ganglion cell layer, and the α4 gene in a subpopulation of amacrine cells. β subunit mRNA is present diffusely throughout the entire inner nuclear layer and in the ganglion cell layer.

The monoclonal antibody bd 17 (against β2/β3 subunits) stained subpopulations of GABAergic and glycinergic amacrine cells as well as some ganglion cells and bipolar cells. Immunoreactivity was not restricted to synaptic input sites. In the outer plexiform layer bipolar cell dendrites were immunoreactive; in the inner plexiform layer mainly amacrine and ganglion cell processes were labeled, and bipolar cell axons appeared unstained. The results demonstrate a strong heterogeneity of GABAA receptors in the retina.

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Visual Neuroscience
  • ISSN: 0952-5238
  • EISSN: 1469-8714
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