Zebrafish as a model of mammalian cardiac function: Optically mapping the interplay of temperature and rate on voltage and calcium dynamics

Progress in Biophysics and Molecular Biology
Kaveh RayaniGlen F Tibbits

Abstract

The zebrafish (Danio rerio) heart is a viable model of mammalian cardiovascular function due to similarities in heart rate, ultrastructure, and action potential morphology. Zebrafish are able to tolerate a wide range of naturally occurring temperatures through altering chronotropic and inotropic properties of the heart. Optical mapping of cannulated zebrafish hearts can be used to assess the effect of temperature on excitation-contraction (EC) coupling and to explore the mechanisms underlying voltage (Vm) and calcium (Ca2+) transients. Applicability of zebrafish as a model of mammalian cardiac physiology should be understood in the context of numerous subtle differences in structure, ion channel expression, and Ca2+ handling. In contrast to mammalian systems, Ca2+ release from the sarcoplasmic reticulum (SR) plays a relatively small role in activating the contractile apparatus in teleosts, which may contribute to differences in restitution. The contractile function of the zebrafish heart is closely tied to extracellular Ca2+ which enters cardiomyocytes through L-type Ca2+ channel (LTCC), T-type Ca2+ channel (TTCC), and the sodium-calcium exchanger (NCX). Novel data found that despite large temperature effects on heart rate, Vm,...Continue Reading

Citations

Oct 31, 2019·American Journal of Physiology. Regulatory, Integrative and Comparative Physiology·Christina M HullTom W Claydon
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Jan 5, 2022·Biological Reviews of the Cambridge Philosophical Society·Carole J LeeCharles R Tyler

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