Cell Motility and Adhesion Signaling Pathways

Cell motility and adhesion are fundamental processes that underpin embryonic development, immune surveillance, wound healing and tumour invasion. At their core lies a dynamic interplay between transmembrane receptors, intracellular signalling molecules and the cytoskeleton. Integrins and associated adhesion complexes engage the extracellular matrix (ECM), forming focal adhesions that link external cues to actin polymerisation and contractile machinery. Small GTPases of the Rho family, notably Rac1 and Cdc42, orchestrate protrusive structures such as lamellipodia and filopodia, while RhoA drives acto-myosin contractility and tail retraction. Activation of GTPases is catalysed by guanine nucleotide exchange factors (GEFs), whereas GTP hydrolysis is often accelerated by GTPase-activating proteins (GAPs). Scaffold proteins assemble multiprotein signalling hubs to coordinate kinase cascades—most prominently MAPK and PAK pathways—that fine-tune adhesive turnover and directional migration. Mechanical feedback from the ECM influences nuclear transducers such as YAP/TAZ, linking substrate rigidity to gene expression. Dysregulation of these pathways contributes to developmental anomalies and metastatic dissemination, making them prime targets for therapeutic intervention.

Research from Nature Portfolio

Recent studies have revealed a ubiquitin-based mechanism that transforms an effector kinase into an inhibitor of a central cytoskeletal regulator. In embryonic ectoderm, a tissue-specific ubiquitin ligase mono-ubiquitylates PAK1 on the basis of its interaction with a CDC42-activating complex. This modification converts PAK1 from an activator into a suppressor of CDC42 signalling, ensuring spatially restricted morphogenesis of brain, facial and skin tissues. Separately, investigations into neuronal differentiation have identified a specific GEF, Arhgef7 (also known as βPIX), as indispensable for axon formation. Arhgef7 interacts with the small GTPase TC10 to drive cytoskeletal remodelling; disruption of this axis leads to profound axon-growth defects in cortical neurons, highlighting a previously unrecognised upstream regulator of neuronal polarity.

Cell Motility and Adhesion Signaling Pathways publication trend

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

Technical terms

GTPase: Small signalling protein that cycles between active (GTP-bound) and inactive (GDP-bound) states to regulate cytoskeletal dynamics.

Guanine nucleotide exchange factor (GEF): Enzyme promoting the release of GDP from a GTPase, enabling GTP binding and activation.

Focal adhesion: Multiprotein complex that organises integrins, adaptors and kinases at the cell–ECM interface to transduce mechanical and chemical signals.

Extracellular matrix (ECM): Network of proteins and glycosaminoglycans providing structural support and biochemical cues to cells.

Ubiquitylation: Covalent attachment of ubiquitin to a substrate protein, altering its activity, interactions or stability.

Scaffold protein: Molecule that assembles multiple enzymes or signalling components into a spatially organised complex.

References

1. A ubiquitin-based effector-to-inhibitor switch coordinates early brain, craniofacial, and skin development. Nature Communications (2023).
2. Liprin‐α1 contributes to oncogenic MAPK signaling by counteracting ERK activity. Molecular Oncology (2024).
3. Multiparametric Analysis of Cell Shape Demonstrates that β-PIX Directly Couples YAP Activation to Extracellular Matrix Adhesion. Cell Systems (2017).
4. Laminin-10/11 and Fibronectin Differentially Regulate Integrin- dependent Rho and Rac Activation via p130Cas-CrkII-DOCK180 Pathway*. Journal of Biological Chemistry (2001).
5. The guanine nucleotide exchange factor Arhgef7/βPix promotes axon formation upstream of TC10. Scientific Reports (2018).