Cell-Cell Junction Dynamics and Mechanobiology

Cell–cell junctions form the structural and functional backbone of multicellular tissues, coupling adhesive complexes with the actomyosin cytoskeleton to regulate barrier function, tissue remodelling and collective cell behaviour. Adherens junctions and tight junctions dynamically assemble and disassemble in response to biochemical signals and mechanical forces, integrating mechanotransduction pathways that influence cell polarity, migration and the maintenance of tissue integrity. The interplay between junctional proteins, cytoskeletal tension and extracellular matrix stiffness underpins processes as diverse as embryonic morphogenesis, epithelial homeostasis and tumour progression. Understanding how junctional components sense, transmit and adapt to mechanical stress holds promise for novel therapeutic strategies in cancer, fibrosis and regenerative medicine.

Research from Nature Portfolio

Recent methodological advances have enabled physiological measurement of epithelial mechanics without disrupting monolayers. One study applied non-contact acoustic frequency-modulation atomic force microscopy to intact epithelial sheets, revealing that dual knockdown of tight junction scaffolds elevates apical tension and effective viscosity and that junctional tension is highly sensitive to myosin II activity. Complementary work using conventional atomic force spectroscopy demonstrated that adherens and tight junctions make distinct contributions to monolayer stiffness: disruption of cadherin-mediated adhesion greatly reduces cell stiffness, whereas perturbation of tight junctions alters barrier function without markedly diminishing mechanical integrity. Together, these findings highlight how specific junctional complexes bear and regulate mechanical loads to maintain tissue cohesion.

Cell-Cell Junction Dynamics and Mechanobiology publication trend

The graph below shows the total number of articles in cell-cell junction dynamics and mechanobiology across all publications each year (not limited to Nature Index journals).

Technical terms

Adherens junctions (AJs): Cadherin-based cell–cell contacts that connect neighbouring cells via catenins to the actin cytoskeleton, providing mechanical coupling and tissue cohesion.

Tight junctions (TJs): Apical cell–cell junctional complexes composed of claudins, occludin and junctional adhesion molecules that regulate paracellular permeability and establish apicobasal polarity, anchored by ZO proteins.

Zonula occludens-1 (ZO-1): A scaffolding protein at tight junctions that links membrane adhesion molecules to the actomyosin network and functions as a mechanosensor.

Mechanotransduction: The process by which cells convert mechanical stimuli into biochemical signals, enabling adaptive responses to physical forces.

References

1. ZO-1 regulates the migration of mesenchymal stem cells in cooperation with α-catenin in response to breast tumor cells. Cell Death Discovery (2024).
2. The Role of ZO-2 in Modulating JAM-A and γ-Actin Junctional Recruitment, Apical Membrane and Tight Junction Tension, and Cell Response to Substrate Stiffness and Topography. International Journal of Molecular Sciences (2024).
3. The dual Ras-association domains of Drosophila Canoe have differential roles in linking cell junctions to the cytoskeleton during morphogenesis. Journal of Cell Science (2024).
4. Apical surface supracellular mechanical properties in polarized epithelium using noninvasive acoustic force spectroscopy. Nature Communications (2017).
5. Importance of integrity of cell-cell junctions for the mechanics of confluent MDCK II cells. Scientific Reports (2018).