Fibronectin Dynamics in Extracellular Matrix Assembly

Fibronectin is a high‐molecular‐weight glycoprotein that orchestrates the formation and remodelling of the extracellular matrix (ECM). Synthesised as a soluble dimer, it undergoes cell‐mediated conformational changes driven by integrin engagement and actomyosin contractility. These changes expose cryptic self-association sites, leading to the formation of extended fibrillar networks. As fibrils mature, they bind growth factors and other ECM components, establishing a provisional scaffold essential for embryogenesis, tissue repair and homeostasis. Mechanical tension regulates the unfolding of type I and type III modules, modulating mechanotransduction pathways and guiding cell differentiation. Dysregulation of fibronectin assembly contributes to pathological fibrosis, tumour progression and aberrant wound healing. Contemporary research combines biophysical, structural and cell-biological approaches to unravel how local stiffness, post-translational modifications and proteolytic events fine-tune fibronectin fibrillogenesis. Understanding these dynamics informs biomaterial design, regenerative medicine and therapeutic strategies targeting matrix-driven disease processes.

Research from Nature Portfolio

Recent studies have employed super-resolution microscopy to map the spatial arrangement of fibronectin modules within native fibrils. By site-specific labelling and single-molecule localisation, researchers have revealed a ∼95 nm periodicity in protofibrils and an antiparallel overlap of N-terminal regions. Thicker fibres were shown to bundle protofibrils in a less ordered fashion. These insights illuminate the hierarchical assembly mechanism, demonstrating how discrete modular interactions drive fibril architecture and mechanical resilience. The work establishes a molecular blueprint for fibronectin networks, offering a framework to interpret how mutations or mechanical cues alter matrix integrity in health and disease.

Fibronectin Dynamics in Extracellular Matrix Assembly publication trend

The graph below shows the total number of articles in fibronectin dynamics in extracellular matrix assembly across all publications each year (not limited to Nature Index journals).

Technical terms

Extracellular matrix (ECM): A complex network of proteins and polysaccharides that provides structural support and biochemical signals for cells.

Fibronectin: A large dimeric glycoprotein that assembles into fibrils and mediates cell–matrix adhesion, growth factor binding and mechanotransduction.

Fibrillogenesis: The process by which soluble fibronectin dimers are converted into insoluble fibrils through cell-dependent conformational unfolding and self-association.

Integrin: A family of transmembrane receptors that bind ECM proteins and transduce mechanical and chemical cues into intracellular signals.

Mechanotransduction: The conversion of mechanical stimuli, such as tensile force or matrix stiffness, into biochemical signals that influence cell behaviour.

Type I/III modules: Repeated structural domains within fibronectin; type I modules contain key self-association sites, while type III modules unfold under tension to expose cryptic binding sequences.

References

1. Metallization of Targeted Protein Assemblies in Cell‐Derived Extracellular Matrix by Antibody‐Guided Biotemplating. Advanced Science (2023).
2. Fibronectin fragments generated by pancreatic trypsin act as endogenous inhibitors of pancreatic tumor growth. Journal of Experimental & Clinical Cancer Research (2023).
3. Exposure to peroxynitrite impacts the ability of anastellin to modulate the structure of extracellular matrix. Free Radical Biology and Medicine (2023).
4. Molecular architecture of native fibronectin fibrils. Nature Communications (2015).