Amacrine cells with neurotensin- and somatostatin-like immunoreactivities in three species of teleosts with different color vision.
Neurotensin- and somatostatin-like immunoreactivities were localized by pre-embedding techniques in retinal whole-mounts and radial sections of a monochromatic glass catfish (Kryptopterus bicirrhis), a dichromatic cichlid species (Aequidens pulcher), and the tetrachromatic roach (Rutilus rutilus). Both neuropeptides were observed in perikarya and processes of amacrine cells. For a precise identification of cell types, tangential and radial views were correlated with Golgi-impregnated material. The dendritic pattern defining the morphological subtype of amacrine cells was determined by the given neuropeptide or by the species-specific degrees of complexity of retinal structure and function. Neurotensin-like immunoreactivity was localized in amacrine cells of intermediate size, radial symmetry and dendrites with numerous varicosities; they were monostratified in sublayer 3 of the inner plexiform layer. This cell type was common to all three species. In the mono- and dichromatic retinas, a single type of amacrine cell with somatostatin-like immunoreactivity was found with radially oriented, varicose dendrites in sublayer 5. In the tetrachromatic roach retina, two somatostatin-positive amacrine cell types were found with very different patterns of ramification; furthermore, both of these types occurred in more than one sublayer. Possible functional implications for color vision of neuropeptide-specific amacrine cells with uniform morphology in all three species and those with a more varied morphology in the tetrachromatic roach are discussed.
D000818:Animals; D000906:Antibodies; D002397:Catfishes / Q000502:physiology; D003118:Color Perception; D003530:Cyprinidae / Q000502:physiology; D005399:Fishes / Q000502:physiology*; D009496:Neurotensin / Q000032:analysis*; D010471:Perches / Q000502:physiology; D012160:Retina / Q000166:cytology* / Q000502:physiology; D013004:Somatostatin / Q000032:analysis*; D013045:Species Specificity
D000906:Antibodies; D009496:Neurotensin; D013004:Somatostatin