Temperature acclimation modifies Na+ current in fish cardiac myocytes

The Journal of Experimental Biology
Jaakko Haverinen, Matti Vornanen

Abstract

The present study was designed to test the hypothesis that temperature acclimation modifies sarcolemmal Na+ current (INa) of the fish cardiac myocytes differently depending on the animal's lifestyle in the cold. Two eurythermal fish species with different physiological strategies for surviving in the cold, a cold-dormant crucian carp (Carassius carassius L.) and a cold-active rainbow trout (Oncorhynchus mykiss), were used in acclimation experiments. The INa of carp and trout were also compared with INa of a cold stenothermal burbot (Lota lota). In accordance with the hypothesis, cold-acclimation decreased the density of INa in crucian carp and increased it in rainbow trout, suggesting depression of impulse conduction in cold-acclimated carp and positive compensation of impulse propagation in cold-acclimated trout. The steady-state activation curve of trout INa was shifted by 6 mV to more negative voltages by cold acclimation, which probably lowers the stimulus threshold for action potentials and further improves cardiac excitability in the cold. In burbot myocytes, the INa density was high and the position of the steady-state activation curve on the voltage axis was even more negative than in trout or carp myocytes, suggesting ...Continue Reading

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Citations

Oct 16, 2007·Acta Physiologica·J HaverinenM Vornanen
Dec 14, 2011·Marine Drugs·Matti VornanenJaakko Haverinen
Jan 8, 2014·Journal of Comparative Physiology. B, Biochemical, Systemic, and Environmental Physiology·Minna HassinenMatti Vornanen
Dec 3, 2014·Physiological and Biochemical Zoology : PBZ·Jaakko HaverinenMatti Vornanen
Jul 1, 2008·Comparative Biochemistry and Physiology. Toxicology & Pharmacology : CBP·Jonathan A W StecykAnthony P Farrell
Mar 29, 2016·Pesticide Biochemistry and Physiology·Jaakko Haverinen, Matti Vornanen
Oct 9, 2013·Comparative Biochemistry and Physiology. Toxicology & Pharmacology : CBP·Jaakko Haverinen, Matti Vornanen
Jul 8, 2016·The Journal of Experimental Biology·Matti Vornanen
Mar 29, 2014·American Journal of Physiology. Regulatory, Integrative and Comparative Physiology·Eric LinGlen F Tibbits
Apr 22, 2011·American Journal of Physiology. Regulatory, Integrative and Comparative Physiology·Minna HassinenMatti Vornanen
Apr 20, 2007·American Journal of Physiology. Regulatory, Integrative and Comparative Physiology·Jonathan A W StecykMatti Vornanen
Sep 25, 2017·Journal of Comparative Physiology. B, Biochemical, Systemic, and Environmental Physiology·Ahmed BadrMatti Vornanen
Nov 5, 2020·Journal of Physiology and Biochemistry·Denis V AbramochkinAlexey V Karpushev
Sep 28, 2013·The Journal of Experimental Biology·Matti VornanenStuart Egginton
Jan 27, 2019·The Journal of Experimental Biology·Denis V AbramochkinMatti Vornanen
Jan 21, 2006·The Journal of Experimental Biology·Jaakko Haverinen, Matti Vornanen

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