title: Immunohistochemical localization of urotensin I and other neuropeptides in the caudal neurosecretory system of three species of teleosts and two species of elasmobranchs.
abstract: 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 japonicus 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.
mesh_terms: D000818:Animals; D001127:Arginine Vasopressin / Q000032:analysis; D002347:Carps; D005399:Fishes; D019886:Gastrin-Releasing Peptide; D005755:Gastrins / Q000032:analysis; D007106:Immune Sera; D007118:Immunoassay; D009419:Nerve Tissue Proteins / Q000032:analysis*; D009490:Neurosecretory Systems / Q000166:cytology*; D010455:Peptides / Q000032:analysis*; D013004:Somatostatin / Q000032:analysis; D013045:Species Specificity; D013116:Spinal Cord / Q000166:cytology*; D013373:Substance P / Q000032:analysis; D014579:Urotensins / Q000032:analysis*; D014660:Vasoactive Intestinal Peptide / Q000032:analysis
chemical_list: D005755:Gastrins; D007106:Immune Sera; D009419:Nerve Tissue Proteins; D010455:Peptides; D014579:Urotensins; D001127:Arginine Vasopressin; D013373:Substance P; D014660:Vasoactive Intestinal Peptide; D013004:Somatostatin; D019886:Gastrin-Releasing Peptide; C029676:urotensin I