Related Experiment Video
Updated: Jun 8, 2026
07:04
Isolation of Cardiac and Vascular Smooth Muscle Cells from Adult, Juvenile, Larval and Embryonic Zebrafish for Electrophysiological Studies
Published on: February 9, 2022
Calcium handling in zebrafish ventricular myocytes
Ping-Cheng Zhang1, Anna Llach, Xiao Ye Sheng
1Simon Fraser University, British Columbia, Canada.
Summary
Zebrafish (Danio rerio) heart cells show unique excitation-contraction coupling. L-type calcium current (I(Ca,L)) drives contraction below +10 mV, with Na/Ca exchange becoming key at higher potentials.
Area of Science:
- Cardiology
- Molecular Biology
- Physiology
Background:
- Zebrafish (Danio rerio) are vital vertebrate cardiac development models.
- Zebrafish cardiac action potentials resemble human ones.
- Excitation-contraction coupling in zebrafish hearts is poorly understood.
Purpose of the Study:
- To investigate excitation-contraction coupling mechanisms in adult zebrafish cardiomyocytes.
- To characterize the role of L-type calcium current (I(Ca,L)) in zebrafish cardiac contraction.
Main Methods:
- Isolated adult zebrafish ventricular cardiomyocytes.
- Amphotericin-perforated patch-clamp technique.
- Confocal calcium imaging and cell shortening measurements.
Main Results:
- Isolated zebrafish cardiomyocytes yielded high quality atrial and ventricular myocytes.
- Zebrafish ventricular myocytes exhibit larger I(Ca,L) density than mammals.
- Contraction-voltage relationship is monophasic, unlike in mammals.
- I(Ca,L) is the primary contraction driver below +10 mV; Na/Ca exchange is more important above +10 mV.
- Reduced I(Ca,L) at higher frequencies is due to calcium-dependent inactivation.
Conclusions:
- Zebrafish ventricular myocytes have distinct electrophysiological properties compared to mammals.
- Caution is advised when extrapolating findings on calcium handling and contraction from zebrafish to mammals.
