Spatial organization of the extracellular matrix regulates cell-cell junction positioning

Area of Science:

• Cell Biology
• Biophysics
• Developmental Biology

Background:

• Epithelial organization relies on cell-cell and cell-extracellular matrix (ECM) interactions.
• While ECM's role in cell migration and anchoring is known, its contribution to multicellular morphogenesis is less understood.

Purpose of the Study:

• To investigate how ECM influences the spatial organization of intercellular junctions.
• To explore the mechanical regulation of cell positioning by ECM.

Main Methods:

• Developed a minimal model system using fibronectin micropatterns to control cell-ECM adhesion.
• Analyzed the stability of intercellular junction positioning and the magnitude of intra- and intercellular forces.

Main Results:

• ECM proximity stabilizes intercellular junction positioning and increases tensional forces.
• Junctions in ECM-deprived regions showed greater stability and lower forces.
• Heterogeneous ECM distribution led to anisotropic mechanical constraints, prompting cell adaptation.

Conclusions:

• The extracellular matrix plays a morphogenetic role in the mechanical regulation of cells.
• ECM actively influences intercellular junction positioning through mechanical forces.