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DNA Tension Probes to Map the Transient Piconewton Receptor Forces by Immune Cells
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A DNA-based molecular probe for optically reporting cellular traction forces.

Brandon L Blakely1, Christoph E Dumelin2, Britta Trappmann3

  • 1Department of Bioengineering, University of Pennsylvania, Philadelphia, Pennsylvania, USA.

Nature Methods
|October 13, 2014
PubMed
Summary
This summary is machine-generated.

We created molecular tension probes to measure cell forces with high resolution. These probes reveal that cell forces are unevenly distributed within focal adhesions.

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Area of Science:

  • Biophysics
  • Cell Biology
  • Molecular Biology

Background:

  • Cellular forces are crucial for biological processes.
  • Existing methods for measuring cell forces have limitations.

Purpose of the Study:

  • To develop novel molecular tension probes (TPs) for measuring cellular traction forces.
  • To achieve high spatial resolution in force mapping.
  • To enable force measurement independent of substrate deformation.

Main Methods:

  • Development of DNA hairpin-based tension probes.
  • Conjugation of fluorophore-quencher pairs to DNA hairpins.
  • Application of TPs to adherent cells and focal adhesions.

Main Results:

  • TPs report cellular traction forces with high spatial resolution.
  • TPs can be linked to various surfaces.
  • Cellular traction forces are heterogeneous within focal adhesions.
  • Forces are localized at the distal edges of focal adhesions.

Conclusions:

  • Molecular tension probes offer a versatile tool for studying cell mechanics.
  • Cellular force distribution within focal adhesions is non-uniform.
  • TPs provide new insights into cell-substrate interactions.