Immunohistochemical localization of urotensin I and other neuropeptides in the caudal neurosecretory system of three species of teleosts and two species of elasmobranchs |
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Authors: | Chifumi Yamada Shizuhiro Yamada Tomoyuki Ichikawa Professor Hideshi Kobayashi |
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Affiliation: | (1) Department of Biology, Faculty of Science, Toho University, Funabashi, Japan;(2) Department of Veterinary Anatomy, Iwate University, Morioka, Japan;(3) Department of Anatomy and Embryology, Tokyo Metropolitan Institute for Neurosciences, Fuchu, Japan;(4) Department of Biology, Faculty of Science, Toho University, Miyama 2-2-1, Funabashi, 274 Chiba, Japan |
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Abstract: | Summary In three species of teleosts — carp Cyprinus carpio; grass carp Ctenopharyngodon idella; and crucian carp Carassius auratus — the caudal neurosecretory system displays small, medium-sized and large neurons. Urotensin I (UI)-immunoreactive and UI-nonreactive neurons were found in all three groups; in general, the number of the latter neurons exceeded that of the former. Noteworthy are: (i) UI-immunoreactive fibers in the caudal spinal cord and (ii) dense accumulations of UI-immunoreactive product around the capillaries of the urophysis. In two species of elasmobranchs — cat shark Heterodontus japonicas and swell shark Cephaloscyllium umbratile — neurosecretory neurons decreased in size in rostro-caudal direction. Most of the neurosecretory perikarya, their axons and the corresponding neurohemal areas were UI-immunoreactive, but a small number of secretory neurons was devoid of immunoreaction. Oxytocin, arginine vasopressin, substance P, somatostatin, neurotensin, vasoactive intestinal polypeptide and gastrin-releasing peptide were not detected in the caudal neurosecretory system of the carp. |
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Keywords: | Caudal neurosecretory system Urotensin Neuropeptides Teleosts Elasmobranchs Immunohistochemistry |
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