Summary
The distribution of neuropeptide Y (NPY)-like immunoreactivity in rat, rabbit, chick, frog and goldfish retinas was investigated by immunohistochemistry. Positive results were observed only in the frog and goldfish retinas. NPY immunoreactivity was associated with a small population of amacrine cell bodies in the inner nuclear layer and cell processes in the inner plexiform layer of both retinas. In the frog retina, three distinct layers containing immunoreactivity were observed in the inner plexiform layer. In contrast, the immunoreactivity in the same area of the goldfish retina was more or less separated into two layers. Convincing evidence could not be found for the co-existence of NPY-like material with other putative transmitter-like substances in the two retinas.
Radioimmunoassay revealed the presence of small amounts of NPY-like immunoreactivity in the rabbit retina; the goldfish and frog retinas contained significantly more immunoreactive material. High performance liquid chromatography of the immunoreactive material in frog and goldfish retinas showed each retina containing different molecular forms of NPY-like proteins, neither of which resembled porcine NPY or PYY.
The endogenous NPY-like material of the frog retina can be released by potassium depolarisation in a calciumdependent way. In view of all these data an NPY-like protein must now be considered a potential retinal transmitter.
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Osborne, N.N., Patel, S., Terenghi, G. et al. Neuropeptide Y (NPY)-like immunoreactive amacrine cells in retinas of frog and goldfish. Cell Tissue Res. 241, 651–656 (1985). https://doi.org/10.1007/BF00214587
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DOI: https://doi.org/10.1007/BF00214587