Summary
Dopamine, noradrenaline, and adrenaline were assayed with HPLC in the light adapted retinae of carp, frog, chicken, pigeon, rat, guinea-pig, rabbit, cat, pig and cow. Dopamine varied from 0.6 to 2.6 nmol/g wet weight and was not influenced by sympathectomy. The dopamine figures agree with previously published results. Noradrenaline concentrations varied from not detectable to 0.06 nmol/g wet weight in different species. Homolateral sympathectomy significantly decreased the noradrenaline figure in rabbits. There are no previous figures for noradrenaline for most of the species. Adrenaline was not detected in any species.
Immunohistochemical analysis showed noradrenaline to be present in choroidal nerves, but noradrenaline immuno-reactivity was not seen in the retina (chicken, rat, guinea-pig, rabbit, cat, cow).
It is concluded that dopamine is the major catecholamine in the retina. Noradrenaline was found present only in minute amounts in the assays, and much of its was likely to stem from sympathetic nerve fibres. The study did not demonstrate any noradrenergic neurons in the retina.
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Ehinger, B., Steinbusch, H.W.M. Quantitation and immunohistochemistry of catecholamines in the posterior segment of the eye. Histochemistry 82, 435–439 (1985). https://doi.org/10.1007/BF02450478
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DOI: https://doi.org/10.1007/BF02450478