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Evolving cardiac conduction phenotypes in developing zebrafish larvae: implications to drug sensitivity.

Fei Yu1, Jie Huang, Katrina Adlerz

  • 1Department of Biomedical Engineering and Cardiovascular Medicine, University of Southern California, Los Angeles, California 90089, USA.

Zebrafish
|October 21, 2010
PubMed
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Researchers developed a new method to record electrocardiogram (ECG) signals in zebrafish larvae. This technique allows real-time monitoring of cardiac conduction development and drug responses in this emerging model organism.

Area of Science:

  • Cardiovascular Research
  • Developmental Biology
  • Zebrafish Models

Background:

  • Cardiac arrhythmias stem from issues in impulse formation or conduction.
  • Zebrafish (Danio rerio) are increasingly used to study cardiac conduction.
  • Real-time electrocardiogram (ECG) recording in zebrafish larvae presents a technical challenge.

Purpose of the Study:

  • To assess the feasibility of recording ECG signals in zebrafish larvae using micropipette electrodes.
  • To demonstrate dynamic changes in ECG signals during zebrafish development.
  • To investigate the sensitivity of zebrafish ECG signals to Amiodarone.

Main Methods:

  • Utilized micropipette electrodes for ECG signal acquisition in zebrafish larvae.
  • Monitored ECG signal development from 7 to 35 days postfertilization (dpf).

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  • Administered Amiodarone to assess its effect on ECG parameters.

    • Main Results:

    • ECG signals showed P waves and QRS complexes by 7 dpf, with T waves developing by 14 dpf.
    • Mature ECG waveforms similar to adults were observed at 35 dpf, with significantly reduced QRS intervals.
    • Amiodarone treatment resulted in QRS prolongation across developmental stages.

    Conclusions:

    • Micropipette electrodes provide a feasible, noninvasive method for detecting evolving ECG signals in developing zebrafish.
    • This approach enables investigation of cardiac conduction phenotypes in response to various perturbations.
    • Zebrafish larvae serve as a valuable model for studying cardiac electrophysiology and drug effects.