Focal Adhesion Signaling and Cell Mechanotransduction

Focal adhesions are dynamic multi-protein assemblies that anchor the intracellular actin cytoskeleton to the extracellular matrix, thereby converting mechanical stimuli into biochemical signals. Central to this process are integrin receptors, which cluster upon ligand binding and recruit scaffold and signalling proteins such as talin, vinculin and paxillin. The recruitment of focal adhesion kinase (FAK) and Src family kinases initiates phosphorylation cascades that regulate cell migration, proliferation and survival. Mechanotransduction emerges as forces transmitted through focal adhesions alter protein conformation, exposing phosphorylation sites and docking motifs in adaptors like p130Cas. Stretch-induced phosphorylation of p130Cas and conformational changes in vinculin modulate adhesion strength and cytoskeletal tension. Downstream Rho GTPases coordinate actomyosin contractility to adjust cell morphology and motility in response to matrix stiffness. This finely tuned interplay underlies diverse physiological processes, from tissue development to wound healing, and its dysregulation contributes to pathological states including fibrosis and cancer invasion.

Research from Nature Portfolio

Studies have dissected the mechanosensory function of p130Cas anchoring domains, demonstrating that its SH3 and CCH motifs tether the protein within the force-transduction layer of the adhesion plaque and are essential for efficient stretch-induced signalling. Structural analysis of the p130Cas SH3 domain has defined a unique binding motif that requires a central lysine and revealed how tyrosine phosphorylation modulates ligand recognition, thereby expanding the network of mechanotransduction partners. Investigations into breast cancer models have uncovered a novel role for the transcriptional repressor Blimp1 in linking p130Cas-ErbB2 signalling to focal adhesion dynamics, showing that Blimp1 upregulation enhances adhesion turnover and invasive behaviour through modulation of focal adhesion kinase activity.

Focal Adhesion Signaling and Cell Mechanotransduction publication trend

The graph below shows the total number of articles in focal adhesion signaling and cell mechanotransduction across all publications each year (not limited to Nature Index journals).

Technical terms

Focal adhesion: A multi-protein complex that links integrins to actin filaments and mediates force transmission across the cell membrane.

Mechanotransduction: The process by which cells convert mechanical forces into biochemical signals to regulate function.

Integrins: Transmembrane receptors that bind extracellular matrix proteins and initiate intracellular signalling upon clustering.

p130Cas: A scaffold protein in focal adhesions whose stretch-sensitive phosphorylation modulates downstream signalling and cell motility.

SH3 domain: A small protein module that recognises proline-rich motifs, mediating protein–protein interactions within signalling complexes.

References

1. Unchain My Heart: Integrins at the Basis of iPSC Cardiomyocyte Differentiation. Stem Cells International (2019).
2. A Fyn biosensor reveals pulsatile, spatially localized kinase activity and signaling crosstalk in live mammalian cells. eLife (2020).
3. The interaction of p130Cas with PKN3 promotes malignant growth. Molecular Oncology (2018).
4. The role of focal adhesion anchoring domains of CAS in mechanotransduction. Scientific Reports (2017).
5. Structural characterization of CAS SH3 domain selectivity and regulation reveals new CAS interaction partners. Scientific Reports (2017).
6. Dysregulation of Blimp1 transcriptional repressor unleashes p130Cas/ErbB2 breast cancer invasion. Scientific Reports (2017).