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Related Concept Videos

Cell-matrix's Response to Mechanical Forces01:13

Cell-matrix's Response to Mechanical Forces

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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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Fibril-associated collagens are a type of collagens present in the extracellular matrix with interrupted triple helices or FACIT (Fibril-associated collagens interrupted triple-helices). FACIT help connect and attach the collagen fibrils with each other as well as with other proteins of the extracellular matrix.
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Rudolph Virchow discovered spindle-shaped cells called fibroblasts in 1858. Inactive fibroblasts, called fibrocytes, become activated by various stimuli, such as growth factors and inflammatory cytokines. Activated fibroblasts play a crucial role in wound healing, inflammation, formation of new blood vessels, and cancer progression. Uncontrolled activation of fibroblasts results in fibrosis, the excess deposition of fibrous tissue, which can lead to scarring and affect normal organs. This...
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Unlike epithelial tissue, which is composed of cells closely packed with little or no extracellular space in between, connective tissue cells are dispersed in a matrix. This extracellular matrix (ECM) is composed of fibrous proteins like collagen, elastin, and fibronectin in a ground substance consisting of interstitial fluid, cell adhesion proteins, and proteoglycans. The proteoglycans form a gel-like material in the spaces between cells and provide hydration, buffering, binding, and force...
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Structural proteins are a category of proteins responsible for functions ranging from cell shape and movement to providing support to major structures such as bones, cartilage, hair, and muscles. This group includes proteins such as collagen, actin, myosin, and keratin.
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Type IV collagen is a 400 nm long, network-forming collagen that acts as a barrier between the epithelial and endothelial cells. Type IV collagen  forms the backbone of the basement membrane by scaffolding with laminin, entactin, proteoglycans, and fibronectin. Apart from rendering structural support to the basement membrane, it also helps entail signaling potentials necessary for both pathological and physiological functions.
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Related Experiment Video

Updated: Dec 22, 2025

Engineering Fibrin-based Tissue Constructs from Myofibroblasts and Application of Constraints and Strain to Induce Cell and Collagen Reorganization
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Engineering Fibrin-based Tissue Constructs from Myofibroblasts and Application of Constraints and Strain to Induce Cell and Collagen Reorganization

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Collagen microarchitecture mechanically controls myofibroblast differentiation.

Bo Ri Seo1,2, Xingyu Chen3,4, Lu Ling1

  • 1Nancy E. and Peter C. Meinig School of Biomedical Engineering, Cornell University, Ithaca, NY 14853.

Proceedings of the National Academy of Sciences of the United States of America
|May 10, 2020
PubMed
Summary
This summary is machine-generated.

Collagen fiber thickness, not just stiffness, drives myofibroblast differentiation. Thicker fibers promote cell contractility and proangiogenic signaling, impacting wound healing and cancer progression.

Keywords:
3D fibrous matrix mechanicsadipose-derived stem cellscollagen microarchitecturemechanosignalingmyofibroblast differentiation

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Area of Science:

  • Biomaterials Science
  • Cell Biology
  • Tissue Engineering

Background:

  • Altered collagen type I microarchitecture is linked to wound healing and cancer.
  • Myofibroblasts are key players in collagen remodeling, but their differentiation triggers remain unclear.
  • The mechanical influence of collagen microarchitecture on myofibroblast differentiation is not well understood.

Purpose of the Study:

  • To investigate if fibrillar collagen network microarchitecture mechanically regulates myofibroblast differentiation of adipose stromal cells (ASCs).
  • To determine if this regulation occurs independently of bulk material stiffness.
  • To explore the downstream effects on cell behavior and tissue formation.

Main Methods:

  • Microfabrication of collagen gels with controlled fiber thickness and pore size by adjusting gelation temperature.
  • Rheological characterization and computational simulations to assess network mechanical properties (strain-stiffening).
  • Culture of ASCs within these engineered collagen scaffolds to evaluate differentiation markers, contractility, and fibronectin deposition.

Main Results:

  • Networks with thicker collagen fibers and larger pores exhibited increased strain-stiffening.
  • ASCs cultured in thicker fiber scaffolds showed enhanced contractility, myofibroblast marker expression, and fibronectin deposition.
  • Myofibroblast differentiation in thicker fiber scaffolds promoted a proangiogenic phenotype and endothelial sprouting.

Conclusions:

  • Collagen microarchitecture, specifically fiber thickness and pore size, mechanically regulates myofibroblast differentiation of ASCs.
  • This regulation is independent of collagen concentration and bulk stiffness, acting via local cellular mechanosignaling.
  • Findings have significant implications for regenerative medicine and anticancer therapies by highlighting microstructural control of fibrosis and angiogenesis.