Central effects of native urotensin II on motor activity, ventilatory movements, and heart rate in the trout Oncorhynchus mykiss

Brain Research
Frédéric LancienJ C Le Mevel

Abstract

Urotensin II (UII) has been originally isolated from fish urophysis. However, in fish as in mammals, UII is also produced in brain neurons. Although UII binding sites are widely distributed in the fish central nervous system (CNS), little is known regarding its central activities. In the present study, we have investigated the effects of intracerebroventricular (ICV) administration of synthetic trout UII on the duration of motor activity (ACT; evidenced by bursts of activity on the trace of the ventilatory signal), ventilatory frequency (VF), ventilatory amplitude (VA), and heart rate (HR) in unanesthesized trout, Oncorhynchus mykiss. ICV injection of very low doses of UII (1 and 5 pmol) produced a dose-dependent increase of ACT without affecting VF, VA, or HR. At a higher dose (50 pmol), UII stimulated ACT as well as VF, VA, and HR. ICV injection of trout angiotensin II (5 pmol) did not affect ACT, VF, and VA, but provoked a robust increase in HR. These data provide the first evidence that central administration of UII stimulates motor activity in a nonmammalian vertebrate.

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Citations

Dec 12, 2013·Respiratory Physiology & Neurobiology·Marc KermorgantJean-Claude Le Mével
Apr 18, 2014·Journal of Molecular Endocrinology·Hervé TostivintDan Larhammar
Apr 1, 2014·General and Comparative Endocrinology·Marc KermorgantJean-Claude Le Mével
Feb 24, 2016·Comparative Biochemistry and Physiology. Toxicology & Pharmacology : CBP·Gilmer VanegasJean-Claude Le Mével
Feb 26, 2008·Peptides·Jean-Claude do RegoJean Costentin
Oct 13, 2007·Peptides·Jérôme LeprinceHubert Vaudry
Jul 17, 2010·Annals of the New York Academy of Sciences·Hubert VaudryJérôme Leprince
Oct 10, 2006·Regulatory Peptides·Frédéric Lancien, Jean-Claude Le Mével
Jan 25, 2006·The Journal of Comparative Neurology·Sylvie JégouIsabelle Lihrmann
Jun 15, 2012·American Journal of Physiology. Regulatory, Integrative and Comparative Physiology·Frédéric LancienJean-Claude Le Mével
Sep 4, 2007·The Journal of Experimental Biology·Jean-Claude Le MévelJ Michael Conlon
May 11, 2012·The Journal of Experimental Biology·Jean-Claude Le MévelJ Michael Conlon

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