Single-Cell Force Spectroscopy in Cell Adhesion Studies

Single-cell force spectroscopy (SCFS) refers to a family of techniques that quantify the mechanical interaction between an individual living cell and a substrate, a neighbouring cell or extracellular matrix (ECM) component. By measuring forces in the pico- to nanonewton range and registering temporal profiles of adhesion strength, SCFS has become an essential tool in mechanobiology and biophysics. Conventional atomic force microscopy (AFM) approaches have been augmented by microfluidic cantilevers (Fluidic force microscopy or FluidFM) and high-throughput optical sensors such as resonant waveguide grating (RWG) biosensors. These hybrid platforms enable controlled cell capture, precise force loading and kinetic mapping of attachment and detachment events. Applications of SCFS span integrin-mediated adhesion studies, dissecting focal adhesion assembly, probing the role of the glycocalyx, characterising cancer cell mechanics and evaluating biomaterial interfaces. By offering unprecedented spatial and temporal resolution, SCFS contributes to fundamental insights into cell migration, tissue morphogenesis, drug screening and diagnostic classification, while guiding the design of next-generation therapeutic and tissue-engineering strategies.

Research from Nature Portfolio

Recent advances have clarified how integrin classes coordinate to stabilise early adhesion. Single-cell force spectroscopy revealed that αV-class integrins initially dominate cell binding to fibronectin, then signal to α5β1 integrins to form additional adhesion sites via RhoA/ROCK/myosin-II and Arp2/3 pathways, with formin-dependent reinforcement. This two-phase competition-cum-cooperation mechanism underlies rapid focal adhesion assembly. In parallel, a combined label-free optical biosensor and robotic FluidFM system has enabled the kinetic profiling of adhesion forces across large cell populations. This platform calibrates biosensor signals against direct force measurements, then monitors the temporal evolution of single-cell adhesion force and energy with log-normal distributions as cells spread on substrates. Such high-throughput kinetic SCFS offers non-invasive quantification of population heterogeneity in cancer cells and healthy cells, illuminating dynamic adhesion processes with unprecedented time resolution.

Single-Cell Force Spectroscopy in Cell Adhesion Studies publication trend

The graph below shows the total number of articles in single-cell force spectroscopy in cell adhesion studies across all publications each year (not limited to Nature Index journals).

Technical terms

Single-cell force spectroscopy (SCFS): Techniques for measuring the interaction force between an individual cell and a substrate or another cell, typically via AFM-based cantilevers or microfluidic probes.

Atomic force microscopy (AFM): A high-resolution technique that uses a sharp probe on a cantilever to measure forces and topography at the nanoscale.

Fluidic force microscopy (FluidFM): A hybrid AFM approach featuring microchanneled cantilevers with integrated fluidics for cell capture, manipulation and force measurement under controlled pressure.

Resonant waveguide grating (RWG) biosensor: An optical sensor that detects sub-nanometre shifts in cell mass distribution and adhesion kinetics over large areas without labels.

Focal adhesion: A dynamic macromolecular complex that links the actin cytoskeleton to the extracellular matrix via integrin receptors, mediating cell adhesion and mechanotransduction.

Integrin: A transmembrane receptor that binds ECM proteins such as fibronectin, transmitting mechanical and chemical signals to regulate cell adhesion and signalling.

References

1. αV-class integrins exert dual roles on α5β1 integrins to strengthen adhesion to fibronectin. Nature Communications (2017).
2. Single-cell adhesion force kinetics of cell populations from combined label-free optical biosensor and robotic fluidic force microscopy. Scientific Reports (2020).
3. Hydrodynamic function and spring constant calibration of FluidFM micropipette cantilevers. Microsystems & Nanoengineering (2024).
4. 4D Force Detection of Cell Adhesion and Contractility. Nano Letters (2023).
5. Label-Free Single-Cell Cancer Classification from the Spatial Distribution of Adhesion Contact Kinetics. ACS Sensors (2024).