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Related Concept Videos

Overview of Cell-Matrix Interactions01:24

Overview of Cell-Matrix Interactions

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The extracellular matrix or ECM holds cells together to form a tissue and allows the cells within the tissue to communicate. ECM comprises proteins such as fibronectin, collagen, laminin, etc. The most abundant protein in this space is collagen. Collagen fibers are interwoven with carbohydrate-containing protein molecules called proteoglycans. ECM allows cell migration and provides a structural scaffold at cell adhesion that anchors the cell when the extracellular matrix proteins interact with...
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In animal cells, the extracellular matrix allows cells within tissues to withstand external stresses and transmits signals from the outside of the cell to the inside. The extracellular matrix is extensive, and its composition varies between different types of tissues. For example, the reticular fibers and ground substance make up the ECM in loose connective tissue, while collagen and bone minerals make up the ECM of bone tissue. 
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Integrins act both as extracellular input receivers and as intracellular processing activators. As their name suggests, integrins are entirely integrated into the membrane structure. Their hydrophobic membrane-spanning regions interact with the phospholipid bilayer's hydrophobic region. These membrane receptors provide extracellular attachment sites for effectors like hormones and growth factors. They activate intracellular response cascades when their effectors are bound and active.
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Updated: Nov 22, 2025

Concentric Gel System to Study the Biophysical Role of Matrix Microenvironment on 3D Cell Migration
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Fiber Density Modulates Cell Spreading in 3D Interstitial Matrix Mimetics.

Daniel L Matera, William Y Wang, Makenzee R Smith

    ACS Biomaterials Science & Engineering
    |January 6, 2021
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    Summary

    Engineered fibrous hydrogel composites guide cell behavior and mechanosensing in 3D. This novel approach creates more physiologically relevant tissue models by mimicking the extracellular matrix (ECM) microstructure.

    Keywords:
    Yes-associated proteincell morphologydisease modelingextracellular matrixmicroenvironmentthree-dimensional cell culture

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    Area of Science:

    • Biomaterials Science
    • Cell Biology
    • Tissue Engineering

    Background:

    • Cellular behavior is significantly influenced by the extracellular matrix (ECM), a complex 3D structure.
    • Synthetic ECMs offer tunable properties but often lack the fibrous topography found in vivo.
    • Existing models struggle to replicate the intricate microstructural cues of natural tissues.

    Purpose of the Study:

    • To develop a versatile method for creating tunable, biomimetic fibrous architectures in 3D.
    • To investigate the impact of fibrous topography and density on cell behavior and mechanosensing within hydrogel composites.
    • To establish a novel platform for generating more physiologically relevant tissue and disease models.

    Main Methods:

    • Electrospinning of photo-cross-linkable polymers into fibers.
    • Photopatterning of fibers to control length and architecture.
    • Coencapsulation of cells and patterned fibers within various hydrogel matrices (natural, semisynthetic, synthetic).
    • Fabrication of fiber-reinforced hydrogel composites (FHCs).

    Main Results:

    • Cells in FHCs exhibited accelerated spreading rates compared to those in non-fibrous hydrogels.
    • Increased fiber density modulated cell morphology and enhanced 3D cellular mechanosensing.
    • Nuclear localization of Yes-associated protein (YAP) increased with higher fiber density, indicating heightened mechanosensing.
    • Demonstrated the impact of physical guidance cues in 3D environments.

    Conclusions:

    • The developed approach enables the creation of modular fibrous architectures for biomimetic models.
    • Fibrous topography and density are critical physical cues that influence cell behavior and mechanosensing in 3D.
    • This method advances the development of more accurate and physiologically relevant in vitro models for tissue engineering and disease research.