Displacement fields using correlation methods as a tool to investigate cell migration in 3D collagen gels

Area of Science:

• Biophysics
• Cell Biology
• Biomaterials Science

Background:

• Cell migration is vital for biological processes, involving interactions with the extracellular matrix (ECM).
• Quantifying forces exerted by migrating cells on the ECM is essential for understanding tissue development and disease progression.
• Existing methods may lack the precision to accurately measure these forces in complex 3D environments.

Purpose of the Study:

• To develop and validate a novel method for measuring forces exerted by living cells during migration.
• To accurately determine displacement fields and fiber deformations within the ECM.
• To apply this method to study cancer cell migration in varying collagen concentrations.

Main Methods:

• Utilizing reflectance confocal microscopy for precise fiber localization.
• Employing correlation techniques and digital image processing to analyze displacement fields.
• Conducting benchmark tests with known shear and stretching motions to validate the method.

Main Results:

• The developed method accurately locates ECM fibers and quantifies cellular displacement fields.
• Benchmark tests confirmed the method's reliability for shear and stretching motions.
• Successful application in studying cancer cell migration dynamics within collagen gels of different concentrations.

Conclusions:

• The presented microscopy and image processing technique offers a robust tool for measuring cell-exerted forces on the ECM.
• This method provides valuable insights into the mechanics of cell migration, particularly in the context of cancer.
• Further applications include studying cell-matrix interactions in various physiological and pathological conditions.