Mechanical Behavior of Extracellular Matrix Tissues

The mechanical behaviour of extracellular matrix tissues underpins tissue development, homeostasis and repair. The extracellular matrix (ECM) comprises a complex network of fibrous proteins—principally collagen, elastin and fibrin—embedded within a hydrated polysaccharide-rich ground substance. This hierarchical structure confers a unique combination of strength, elasticity and viscoelastic damping. At the microscopic scale, collagen fibril alignment and cross-link density determine stiffness and tensile strength. At the intermediate scale, fibrillar entanglements and matrix porosity modulate deformation under load and facilitate fluid flow. At the macroscale, such multiscale mechanics govern tissue resilience and failure thresholds. Mechanical cues from the ECM regulate cellular functions via mechanotransduction pathways, influencing cell shape, migration and matrix remodelling. Conversely, cellular forces contribute to matrix alignment and dynamic turnover, creating a feedback loop essential to processes as diverse as fibre orientation in engineered cardiovascular constructs, wound contraction in dermal healing and stiffness changes in fibrotic or tumourous matrices. A thorough understanding of ECM mechanical properties is therefore vital for biomaterial design, regenerative medicine strategies and elucidating disease mechanisms characterised by matrix stiffening or degradation.

Research from Nature Portfolio

Recent studies have elucidated the structural basis of collagen degradation by bacterial enzymes. High-resolution crystallography of a Vibrio collagenase module revealed an activator-peptidase mechanism by which triple-helical collagen is recognised and unwound prior to proteolysis. Molecular dynamics and biochemical analyses demonstrated how conformational changes in accessory domains facilitate substrate binding and catalytic closure. By uncovering this integrated collagenolytic mechanism, the work informs on how enzymatic degradation modulates matrix mechanical integrity and offers atomic-level templates for future interventions aimed at controlling ECM breakdown in both biomedical and environmental contexts.

Mechanical Behavior of Extracellular Matrix Tissues publication trend

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

Technical terms

Extracellular matrix (ECM): A network of proteins and polysaccharides providing structural support and biochemical signalling cues to cells.

Hydrogel: A water-saturated polymer network whose mechanical properties can be tuned to mimic those of native tissues.

Fibrillogenesis: The self-assembly process by which fibrous proteins form organised, load-bearing fibrils.

Complex modulus: A measure of a material’s resistance to deformation under oscillatory loading, encompassing both elastic (storage) and viscous (loss) components.

Mechanical strain: The relative deformation experienced by a material in response to applied stress.

References

1. pH and Thrombin Concentration Are Decisive in Synthesizing Stiff, Stable, and Open‐Porous Fibrin‐Collagen Hydrogel Blends without Chemical Cross‐Linker. Advanced Healthcare Materials (2023).
2. Fabrication and Characterization of Quad-Component Bioinspired Hydrogels to Model Elevated Fibrin Levels in Central Nervous Tissue Scaffolds. Gels (2024).
3. Structure of Vibrio collagenase VhaC provides insight into the mechanism of bacterial collagenolysis. Nature Communications (2022).
4. Mechanical Strain Stabilizes Reconstituted Collagen Fibrils against Enzymatic Degradation by Mammalian Collagenase Matrix Metalloproteinase 8 (MMP-8). PLOS ONE (2010).
5. The Evolution of Collagen Fiber Orientation in Engineered Cardiovascular Tissues Visualized by Diffusion Tensor Imaging. PLOS ONE (2015).