Summary
The presence and distribution of biogenic monoamines in the tube-wormChaetopterus variopedatus were investigated by a radioenzymatic method and HPLC with electrochemical detection, and the cellular localization of serotonin by peroxidase-antiperoxidase (PAP) immunohistochemistry with an antibody against serotonin-formaldehyde-protein conjugate. Dopamine, norepinephrine, epinephrine, serotonin (5-HT) and some of their metabolites were detectable, dopamine and norepinephrine being present in substantially larger amounts than 5-HT and epinephrine. With few exceptions, the largest amounts of amines were localized in the most nerve-rich tissues such as tentacles, and those containing cerebral ganglia and the ventral nerve cord. Serotonin-immunoreactive unipolar neurons were widely distributed in the dorso-lateral cerebral ganglia, the neurosecretory pharyngeal ganglion and the segmental ganglia of the anterior (dorsolateral) and posterior (medioventral) nerve cords. Some nerve-fiber tracts stained in the cerebral ganglia, but the neuropiles of segmental ganglia were the most intensely reactive CNS structures. Numerous reactive fibers were also present in connectives, commissures and segmental nerves. All peripheral sensory structures included serotonin-immunoreactive cells and neurites, especially the parapodial cirri and the bristle receptors of the setae. Trunk and parapodial muscles contained reactive varicose fibers and neuronal somata. These results suggest that monoamines are abundant and widespread in these worms and that 5-HT appears to have a key sensory role.
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Anctil, M., De Waele, J.P., Miron, M.J. et al. Monoamines in the nervous system of the tube-wormChaetopterus variopedatus (Polychaeta): Biochemical detection and serotonin immunoreactivity. Cell Tissue Res. 259, 81–92 (1990). https://doi.org/10.1007/BF00571433
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DOI: https://doi.org/10.1007/BF00571433