Label-free optical mapping for large-area biomechanical dynamics of multicellular systems

Area of Science:

• Biophysics
• Cellular Mechanics
• Bioengineering

Background:

• Cellular biomechanical properties, like traction forces, are vital for multicellular system functions.
• Existing methods for mapping large-area biomechanical dynamics have limited fields of view and rely on scanning.
• A need exists for advanced technologies to observe biomechanical dynamics across larger cellular areas.

Purpose of the Study:

• To develop and validate a novel platform for large-area biomechanical dynamics profiling.
• To overcome the spatial limitations of current traction force microscopy techniques.
• To enable high-resolution, long-term, and label-free observation of cellular mechanical activities.

Main Methods:

• Utilized a novel platform with numerous optical diffractive elements for biomechanical dynamics profiling.
• Achieved a 10.6 mm × 10.6 mm field of view, significantly larger than traditional methods.
• Employed high spatiotemporal resolution (130 fps, 20 μm) for capturing transient mechanical waves.

Main Results:

• Demonstrated a three-order-of-magnitude improvement in field of view compared to conventional traction force microscopy.
• Successfully captured transient mechanical waves from neonatal rat ventricular myocytes.
• Enabled label-free, long-term observations up to one week with minimal cellular disruption.

Conclusions:

• The novel optical platform significantly advances the capability to map large-area cellular biomechanical dynamics.
• This technology facilitates unprecedented insights into collective cell behaviors and physiological regulation.
• Simultaneous measurement of biomechanical dynamics and calcium ion concentrations is now feasible.