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Quantifying compressive forces between living cell layers and within tissues using elastic round microgels.

Erfan Mohagheghian1,2, Junyu Luo1, Junjian Chen1

  • 1Laboratory for Cellular Biomechanics and Regenerative Medicine, Department of Biomedical Engineering, College of Life Science and Technology, Huazhong University of Science and Technology, Wuhan, Hubei, 430074, China.

Nature Communications
|May 16, 2018
PubMed
Summary
This summary is machine-generated.

Researchers developed novel elastic round microgels (ERMGs) to quantify cellular compressive stresses. This new method measures mechanical forces in 3D, offering insights into cell behavior and disease progression.

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Area of Science:

  • Biomedical Engineering
  • Cell Biology
  • Biophysics

Background:

  • Mechanical stresses significantly influence cell functions, fate, and diseases.
  • Quantifying isotropic compressive stresses in biological systems remains a challenge.
  • Existing methods lack the ability to precisely measure these critical forces.

Purpose of the Study:

  • To develop and validate a novel method for quantifying isotropic compressive stresses in biological contexts.
  • To measure 3D displacements, strains, and tractions exerted by cells on microgels.
  • To investigate the heterogeneity and magnitude of compressive stresses in cell cultures and developing embryos.

Main Methods:

  • Fabrication of fluorescent nanoparticle-labeled, monodisperse elastic microspheres from Arg-Gly-Asp-conjugated alginate hydrogels (ERMGs).
  • Utilizing ERMGs to generate 3D displacements and calculate strains and tractions.
  • Applying ERMGs in cell layers, tumor-repopulating cell (TRC) colonies, and early-stage zebrafish embryos.

Main Results:

  • Quantified average compressive tractions of 570 Pa in cell layers and 360 Pa in TRC colonies within 400-Pa matrices.
  • Demonstrated that surrounding cells apply compressive stresses via actomyosin forces, not mature focal adhesions, on 1.4-kPa ERMGs.
  • Observed substantial heterogeneity in compressive stresses on ERMGs within uniform cell colonies, with no increase relative to TRC colony size.
  • Detected spatial and temporal differences in local normal and shear stresses in early-stage zebrafish embryos.

Conclusions:

  • The developed ERMG method provides a quantitative tool for measuring isotropic compressive stresses in vitro and in vivo.
  • Cellular compressive stresses are heterogeneous and influenced by cell type and matrix properties.
  • This technique offers new possibilities for understanding mechanobiology and its role in development and disease.