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Updated: Jul 11, 2026

Investigating Single Molecule Adhesion by Atomic Force Spectroscopy

Investigating Single Molecule Adhesion by Atomic Force Spectroscopy

Published on: February 27, 2015

Studying integrin-mediated cell adhesion at the single-molecule level using AFM force spectroscopy.

Clemens M Franz¹, Anna Taubenberger, Pierre-Henri Puech

¹BioTechnological Center, University of Technology Dresden, Tatzberg 47-51, 01307 Dresden, Germany. franz@biotec.tu-dresden.de

Science'S STKE : Signal Transduction Knowledge Environment

|October 4, 2007

Summary

Atomic Force Microscopy (AFM) with single-cell force spectroscopy (SCFS) measures single receptor-ligand bond strengths in living cells. This technique reveals the energy landscape of cell adhesion, including dissociation rates and energy barriers.

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Area of Science:

Biophysics
Cell Biology
Materials Science

Background:

Cell adhesion is crucial for biological processes, involving specific receptor-ligand interactions.
Characterizing single-molecule adhesion events in living cells is experimentally challenging.

Purpose of the Study:

To detail the methodology of dynamic Atomic Force Microscopy (AFM) single-cell force spectroscopy (SCFS) for single-molecule adhesion measurements.
To demonstrate the extraction of energy landscape parameters for specific receptor-ligand bonds.

Main Methods:

Utilized AFM in force spectroscopy mode to probe cell adhesion forces at the single receptor-ligand bond level.
Attached living cells to an AFM cantilever to control and limit interactions to single bonds.
Analyzed force-distance curves and generated dynamic force spectra (DFS) by varying force application rates.

Main Results:

Achieved single-molecule sensitivity in measuring cell adhesion forces using dynamic AFM-SCFS.
Determined the strength of single receptor-ligand bonds from force-distance curves.
Extracted energy landscape parameters, including dissociation rate and energy barrier width, from DFS.

Conclusions:

Dynamic AFM-SCFS is a powerful technique for investigating the biophysical properties of single cell adhesion bonds.
The method allows for detailed characterization of the energy landscape governing receptor-ligand interactions, exemplified by alpha(2)beta(1) integrin and type I collagen.