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Tissue stiffness mapping by light sheet elastography.

Min Zhu¹, Kaiwen Zhang^1,2, Evan C Thomas¹

¹Program in Developmental and Stem Cell Biology, Research Institute, The Hospital for Sick Children, Toronto, ON, M5G 0A4, Canada.

Science Advances

|March 14, 2025

Summary

We developed light sheet elastography, a noninvasive technique to map tissue stiffness in developing embryos with cellular resolution. This method allows dynamic monitoring of mechanical changes during crucial developmental processes.

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Area of Science:

Biophysics
Developmental Biology
Cell Biology

Background:

Tissue stiffness is a critical regulator of morphogenesis.
Measuring dynamic changes in tissue stiffness in vivo is essential for understanding developmental mechanisms.
Existing in vivo methods for measuring tissue properties face limitations in resolution, invasiveness, and equipment requirements.

Purpose of the Study:

To introduce a noninvasive method for in toto stiffness mapping of embryonic tissues.
To achieve high spatial and temporal resolution in measuring dynamic tissue mechanics.
To enable the study of the mechanical basis of morphogenesis.

Main Methods:

Coupling low-frequency shear waves with light sheet fluorescence microscopy.
Adapting commercially available instruments for the technique.
Light sheet elastography (LSE) for noninvasive mechanical property assessment.

Main Results:

Achieved in toto stiffness mapping of organ-stage mouse and zebrafish embryos at cellular resolution.
Demonstrated time-lapse stiffness mapping during tissue remodeling.
Enabled stiffness mapping of the beating embryonic heart.

Conclusions:

Light sheet elastography is a versatile, noninvasive tool for probing embryonic tissue mechanics.
The method overcomes limitations of existing techniques, offering improved resolution and accessibility.
This advancement provides new opportunities to investigate the role of mechanical forces in development.