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Updated: Jun 13, 2026

Light Sheet Microscopy of Fast Cardiac Dynamics in Zebrafish Embryos

Light Sheet Microscopy of Fast Cardiac Dynamics in Zebrafish Embryos

Published on: August 13, 2021

Visualizing voltage dynamics in zebrafish heart.

Hidekazu Tsutsui¹, Shin-ichi Higashijima, Atsushi Miyawaki

¹Laboratory of Integrative Physiology, Department of Physiology, Graduate School of Medicine, Osaka University, Suita, Osaka, Japan. tsutsui@phys2.med.osaka-u.ac.jp

The Journal of Physiology

|April 28, 2010

Summary

Zebrafish hearts offer a powerful model for studying heart function and drug effects. A new optical mapping technique revealed how astemizole disrupts heart electrical activity, preventing contraction.

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Area of Science:

Cardiovascular Physiology
Pharmacology
Biomedical Imaging

Background:

The zebrafish is a valuable vertebrate model for cardiovascular research due to its genetic tractability and optical transparency.
Phenotype-based chemical screening using zebrafish hearts is an emerging area for cardiotoxicity assessment and drug discovery.

Purpose of the Study:

To develop a non-invasive optical mapping technique for assessing transmembrane potential in beating zebrafish hearts.
To investigate the cardiotoxic effects of the anti-allergy compound astemizole on heart electrical activity and contraction.

Main Methods:

Utilized a genetically encoded probe for non-invasive transmembrane potential mapping.
Applied astemizole to zebrafish hearts and observed its effects on electrical signal propagation.

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Monitored ventricular contraction in response to astemizole treatment.

Main Results:

Successfully demonstrated non-invasive voltage mapping in beating zebrafish hearts.
Observed aberrant propagation of excitation in response to astemizole.
Identified a lack of ventricular contraction caused by astemizole's effect on electrical propagation.

Conclusions:

The developed optical mapping method offers new possibilities for cardiovascular research.
This technique can be applied to physiological, developmental, and pharmacological studies of the heart.
The findings highlight astemizole's potential cardiotoxicity by disrupting cardiac electrical activity.