High-throughput rheological measurements with an optical stretcher

Area of Science:

• Cellular mechanics
• Biophysics
• Cytoskeletal dynamics

Background:

• The cytoskeleton dictates cell mechanical strength and morphology.
• Cytoskeletal changes are linked to cell differentiation and diseases like cancer.
• Understanding cytoskeleton-cell state links is crucial for diagnostics.

Purpose of the Study:

• To utilize cytoskeleton deformability for distinguishing between different cell states.
• To establish optical deformability as a novel cell marker.
• To demonstrate the application of microfluidic optical stretching in cell analysis.

Main Methods:

• Employing a laser-based optical stretcher (OS) for non-destructive, single-cell deformability testing.
• Integrating microfluidic handling for high-throughput serial cell measurements.
• Analyzing optical deformability to detect subtle cellular state changes.

Main Results:

• Optical deformability effectively distinguishes between normal, cancerous, and metastatic cells.
• The method differentiates stem cells from differentiated cells.
• The assay requires a minimal number of cells, indicating tight cytoskeletal regulation.

Conclusions:

• Optical deformability serves as an inherent cell marker, useful for basic research and diagnostics.
• This technique can facilitate disease diagnosis and stem cell sorting without external markers.
• Microfluidic optical stretching offers a versatile platform for various biological assays.