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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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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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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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Proteoglycans are extensively glycosylated proteins, commonly found in the extracellular matrix, interwoven with collagen fibers. Hyaline cartilage, the most common type of cartilage in the body, consists of short and dispersed collagen fibers associated with large amounts of proteoglycans. These proteoglycans have long negative charges that attract cations, which in turn attract water molecules. This influx of ions and water molecules swells up the proteoglycan like a water-soaked gel that can...
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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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Tissue Architecture Modulates Compositional and Structural Properties of Corneal Myofibroblast-Derived Matrix.

Antonios Giannopoulos1,2, Ludvig J Backman1,2, Patrik Danielson1,3

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This study developed a 3D corneal healing model. The aligned microenvironment influences extracellular matrix properties and protein synthesis, crucial for understanding corneal scarring and developing therapies.

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Area of Science:

  • Biomaterials Science
  • Tissue Engineering
  • Ophthalmology Research

Background:

  • Corneal scarring significantly impacts vision, necessitating better understanding of healing mechanisms.
  • Current in vitro models often fail to replicate the complex in vivo corneal microenvironment.
  • Identifying key regulators of extracellular matrix deposition is vital for preventing pathological scarring.

Purpose of the Study:

  • To create a novel 3D in vitro model simulating human corneal healing.
  • To investigate the role of microenvironmental alignment in corneal myofibroblast behavior and extracellular matrix production.
  • To uncover mechanisms underlying corneal healing and scarring processes.

Main Methods:

  • Cultured corneal myofibroblasts in fibrin hydrogels with aligned (healthy) and random (wounded) configurations.
  • Utilized TGF-β1 induction to mimic fibrotic responses.
  • Assessed cellular (α-SMA) and matrix (collagen, fibronectin, decorin, tenascin C) components and structural properties.

Main Results:

  • Aligned constructs showed increased synthesis of total soluble proteins and collagen type V, but reduced collagen type I.
  • Larger collagen fibril diameters were observed in aligned compared to random constructs.
  • Differential expression of fibronectin, decorin, and tenascin C was noted between aligned and random groups.

Conclusions:

  • Microenvironmental alignment critically modulates extracellular matrix structural properties during corneal healing.
  • Alignment influences the synthesis of key proteins involved in fibrillogenesis and ECM quality.
  • The developed 3D model provides a platform for studying corneal regeneration and developing anti-scarring therapies.