Abstract
The levels of taurine, GABA, glycine, glutamate, aspartate and glutamine in the photoreceptor cell layers and inner retinas of various species have been measured by dansylation of samples obtained with a sectioning technique. GABA was consistently more polarized towards the retinal interior than the other amino acids, at least 80% of the total being present in the inner retinal sections. Very high concentrations of retinal taurine (20–50 μmol/g wet wt retina) were found. The cells accumulating exogenously applied [ 3H]taurine into retinas from the rat, cat, pigeon, rabbit and guinea-pig have been identified by light microscope autoradiography. In all the species, grains overlay Müller fibres and photoreceptor cells. Pigment epithelium from the cat and pigeon was also heavily labelled. In the pigeon retina the distribution of exposed grains in the inner plexiform layer suggests the entry of [ 3H]taurine into specific retinal synapses.
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