title: Relationship between urotensin II- and somatostatin-immunoreactive spinal cord neurons of Catostomus commersoni and Oncorhynchus kisutch (Teleostei).
abstract: This immunocytochemical study describes the presence of separate immunoreactive (IR)-urotensin II (UII) and IR-somatostatin (SOM) systems in the spinal cord of two species of teleost fish. Both systems are arranged in a close spatial interrelationship in which IR-SOM fibres apparently innervate cerebrospinal fluid (CSF)-contacting IR-UII neurons. Specimens of Oncorhynchus kisutch also display CSF-contacting IR-SOM neurons located in the lateral ependymal walls of the central canal, in addition to CSF-contacting IR-UII neurons located ventrally. It is suggested that, in this species, CSF-contacting IR-SOM and IR-UII neurons perceive different stimuli from the CSF and are integrated in such a way that one peptidergic system may modulate the function of the other.
authors.affiliation: Department of Pharmacology and Therapeutics, University of Calgary, Alberta, Canada.
authors.forename: C R
authors.initials: CR
authors.lastname: Yulis
authors.forename: K
authors.initials: K
authors.lastname: Lederis
mesh_terms: D000818:Animals; D005399:Fishes / Q000033:anatomy & histology*; D007150:Immunohistochemistry; D010455:Peptides / Q000276:immunology*; D012474:Salmon / Q000033:anatomy & histology*; D013004:Somatostatin / Q000276:immunology*; D013127:Spinal Nerves / Q000033:anatomy & histology / Q000276:immunology*; D014579:Urotensins / Q000276:immunology*
chemical_list: D010455:Peptides; D014579:Urotensins; D013004:Somatostatin; C029677:urotensin II