Summary
The distribution of an immunoreactive endothelin-1-like peptide was investigated in the nereid, Neanthes diversicolor, using an antiserum raised against synthetic endothelin-1. Immunoreactive perikarya were localized in the brain, and nerve fibers containing endothelin-1-like material were found in the neuropil occupying the central portion of the brain. No immunostained fiber elements were traced in the circumesophageal connectives. Immunoreactive perikarya occurred in the subesophageal ganglion. From this ganglion, specifically stained fibers run posteriorly toward the ventral nerve cord. In each segmental ganglion, immunoreactive neurons were observed in medio-ventral and latero-ventral regions, and one or two marked fibers extended to the parapodium. In the parapodium, small immunoreactive perikarya and fiber elements were visible. Immunolabeled fibers occurred in the stomatogastric nerves, in the wall of the buccal cavity, and in the pharynx, esophagus, intestine and its anal region. Immunoreactive perikarya and nerve fibers were visualized between the circular muscle layer and epithelial cell layer in the esophagus and intestine. The endothelin-1-like substance shown to occur in N. diversicolor appears to function as a neurotransmitter or neuromodulator.
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Kasuya, Y., Kobayashi, H. & Uemura, H. The distribution of an immunoreactive endothelin-like substance in the nervous system of the nereid, Neanthes diversicolor (Annelida). Cell Tissue Res 261, 485–492 (1990). https://doi.org/10.1007/BF00313527
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DOI: https://doi.org/10.1007/BF00313527