Summary
The distribution of immunoreactive neuropeptides was investigated in the retina of three species of skates (Raja clavata, R. radiata, R. oscellata), elasmobranch fish often used in electrophysiological work on the retina. Enkephalins, neuropeptide Y (NPY), substance P and glucagon were found in different types of amacrine cells.
All four peptides appeared in cell bodies in the innermost part of the inner nuclear layer. Processes from the cells containing enkephalins were numerous and ramified throughout the inner plexiform layer. Processes from the cells containing glucagon were thick and rare, and were found throughout the inner plexiform layer, at times with a predominance in sublaminae 1 and 4. NPY-immunoreactive fibres appeared mainly in sublamina 1 but also in 2 or 3, and substance-P-immunoreactive fibres in sublaminae 1,4 and 5.
Antisera against somatostatin, VIP or neurotensin did not show any immunoreactivity in the skate retina.
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Bruun, A., Ehinger, B., Sytsma, V. et al. Retinal neuropeptides in the skates, Raja clavata, R. radiata, R. oscellata (Elasmobranchii). Cell Tissue Res. 241, 17–24 (1985). https://doi.org/10.1007/BF00214621
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DOI: https://doi.org/10.1007/BF00214621