Summary
Dopaminergic interplexiform cells in retinae of glass catfish were investigated using an antiserum against tyrosine hydroxylase and peroxidase-anti-peroxidase (PAP) visualization. In whole-mount preparations, we observed a homogeneous distribution of cell bodies throughout the retina without any indication of regional specializations. At the ultrastructural level, we studied the morphology of labelled telodendria within the outer plexiform layer. Apart from contacts with horizontal cells and bipolar cell dendrites, we report for the first time direct contacts with cone pepdicles and rod spherules. Quantitative evaluation of short series of sections showed that all cone pedicles, and a major part of the rod terminals, were approached in this way. The dopaminergic pathway terminating on photoreceptors is discussed in the context of pharmacological effects of this transmitter in the distal retina during light adaptation, i.e., cone contraction, spinule formation and horizontal cell coupling.
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Wagner, H.J., Wulle, I. Dopaminergic interplexiform cells contact photoreceptor terminals in catfish retina. Cell Tissue Res 261, 359–365 (1990). https://doi.org/10.1007/BF00318678
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DOI: https://doi.org/10.1007/BF00318678