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Super-Resolution Axial Imaging for Quantifying Piconewton Traction Forces in Live Cells
Dong-Xia Wang1,2,3, José Ignacio Gallea1, De-Ming Kong2
1Third Institute of Physics - Biophysics, Georg August University, Friedrich-Hund-Platz 1, 37077, Göttingen, Germany.
Angewandte Chemie (International Ed. in English)
|August 18, 2025
Summary
Researchers developed metal-induced energy transfer-based tension probe microscopy (MIET-TPM) to measure axial cell forces with nanometer precision. This breakthrough allows detailed mapping of cellular mechanical forces, crucial for understanding biological processes.
Area of Science:
- Cellular mechanobiology
- Biophysics
- Microscopy
Background:
- Cell mechanics are vital for biological processes.
- Current microscopy methods struggle with high-resolution axial force measurement.
- Nanometer-scale axial force mapping is a significant challenge.
Purpose of the Study:
- To introduce a novel technique for high-resolution axial force mapping.
- To enable simultaneous imaging of plasma membrane and force-exerting molecules.
- To provide insights into nanoscale force transmission mechanisms.
Main Methods:
- Metal-induced energy transfer-based tension probe microscopy (MIET-TPM).
- Integration of MIET imaging with DNA-hairpin molecular tension probes (MTPs).
- Application on standard fluorescence microscopy setups without hardware modification.
Main Results:
- Achieved nanometer precision in axial force measurement.
- Mapped axial integrin tension in focal adhesions and podosomes.
- Correlated force mapping with plasma membrane height profiles.
Conclusions:
- MIET-TPM offers unprecedented axial force resolution.
- The technique provides detailed insights into cellular force transmission.
- MIET-TPM is a versatile and accessible tool for mechanobiology research.
