Cell and Tissue Research

, Volume 254, Issue 3, pp 539–542 | Cite as

Relationship between urotensin II- and somatostatin-immunoreactive spinal cord neurons of Catostomus commersoni and Oncorhynchus kisutch (Teleostei)

  • C. Roberto Yulis
  • Karl Lederis


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.

Key words

Urotensin II Somatostatin CSF-contacting neurons Central canal Catostomus commersoni, Oncorhynchus kisutch (Teleostei) 


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Copyright information

© Springer-Verlag 1988

Authors and Affiliations

  • C. Roberto Yulis
    • 1
  • Karl Lederis
    • 1
  1. 1.Department of Pharmacology and TherapeuticsThe University of CalgaryCalgaryCanada

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