Measurement of single-cell adhesion strength using a microfluidic assay

Area of Science:

• Biophysics
• Cell Biology
• Biomaterials Science

Background:

• Cell adhesion is crucial for physiological and pathological processes, but quantifying its strength at the single-cell level is challenging.
• Existing methods often lack the sensitivity or throughput to analyze strongly adhered cells or their relationship with cell function.

Purpose of the Study:

• To develop and validate a microfluidic assay for precise single-cell adhesion strength measurements.
• To investigate the relationship between cell morphology and adhesion strength in fibroblasts.

Main Methods:

• Fabrication and utilization of a microfluidic channel designed for high shear stress generation under laminar flow.
• Employing video microscopy to monitor the detachment of individual NIH3T3 fibroblasts under increasing flow rates.
• Utilizing computational fluid dynamics (CFD) to analyze the stress distribution based on cell geometry.

Main Results:

• The microfluidic assay successfully measured adhesion strength for well-spread, strongly adhered cells.
• Cell adhesion strength demonstrated a positive correlation with cell area and circularity.
• CFD analysis provided insights into how cell geometry influences the applied stress.

Conclusions:

• The developed microfluidic method offers a powerful, accessible tool for quantifying single-cell adhesion strength.
• Morphological characteristics significantly influence cell adhesion strength, providing new avenues for understanding cell-substrate interactions.
• This assay facilitates the study of biological events and relationships previously inaccessible with conventional techniques.