Optical Elastography for Micropressure Characterization of Zebrafish Embryonic Cardiac Development
Anand G Vaish1, Yuji Tomizawa1, David F Daggett2
1Department of Biomedical Engineering, University of Connecticut, A.B. Bronwell Building, Room 217, 260 Glenbrook Road, Unit 3247, Storrs, CT, USA.
Annals of Biomedical Engineering
|November 30, 2023
Summary
Researchers developed a novel optical elastography tool to measure microscale mechanical forces during embryonic heart development. This method reveals significant differences in yolk pressure between wildtype and anesthetized zebrafish embryos, aiding congenital heart disease research.
Area of Science:
- Developmental Biology
- Biophysics
- Cardiovascular Research
Background:
- Embryonic heart formation is critically dependent on mechanical forces.
- Quantifying these forces at the embryonic microscale presents significant challenges.
- Understanding early cardiac mechanics is vital for diagnosing congenital heart defects.
Purpose of the Study:
- To introduce a novel non-invasive tool for measuring mechanical forces during early heart development.
- To track changes in cardiac pressure and contractility in vivo.
- To investigate the impact of anesthesia on embryonic cardiac function.
Main Methods:
- Utilized high-resolution optical elastography and tissue stiffness measurements.
- Employed the zebrafish embryo as a model system for in vivo studies.
- Monitored cardiac development from 24 to 30 hours post-fertilization (hpf), comparing wildtype and MS-222 treated embryos.
Main Results:
- Wildtype embryos exhibited yolk indentation pressures ranging from 0.32 to 0.41 mmHg between 24-30 hpf.
- MS-222 treated embryos showed significantly lower yolk indentation pressures (0.22-0.29 mmHg).
- A statistically significant difference (p < 0.05) in yolk indentation pressure was observed between control and treated groups at 24 and 30 hpf.
Conclusions:
- The developed optical elastography method enables non-invasive evaluation of embryonic cardiac contractility and pressure.
- This technique provides novel insights into early cardiac development and the effects of anesthesia.
- Findings contribute to a better understanding of heart development and may inform diagnostic tools for congenital heart disease.
