Matrigel patterning reflects multicellular contractility.

Area of Science:

• Cell Biology
• Biophysics
• Biomaterials Science

Background:

• Non-muscle myosin II (NMII) contractility is crucial for tissue development and remodeling.
• Cytoskeletal dysregulation is linked to birth defects and cancer progression.

Purpose of the Study:

• To establish the Matrigel patterning assay as a sensitive tool for evaluating cell contractility in a soft extracellular matrix (ECM).
• To computationally model ECM remodeling driven by cell contractile forces.
• To functionally demonstrate the effect of S100A4 on cell contractility.

Main Methods:

• Utilized the Matrigel patterning assay to assess endothelial cell contractility.
• Developed a computational model to simulate ECM-Matrigel composite material remodeling.
• Calibrated the assay using NMII inhibitors (blebbistatin, Y27632) in A431 cells.
• Quantified cell contractility through image analysis of the patterning process.

Main Results:

• The Matrigel assay effectively measures cell contractility within a soft ECM.
• Computational modeling elucidated the mechanism of ECM network formation via cell forces.
• Overexpression of S100A4 was shown to significantly reduce cell contractility.
• S100A4 inhibits NMIIA activity, leading to reduced cellular contractility.

Conclusions:

• The Matrigel patterning assay is a robust bioassay for quantifying cellular contractility.
• S100A4 plays a role in reducing cell contractility, potentially through NMIIA inhibition.
• Findings offer insights into the role of cell contractility in tissue morphogenesis and cancer progression.