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Related Concept Videos

Phases of Wound Repair01:28

Phases of Wound Repair

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Following injury, the integrity of the injured tissues must be reestablished. For example, in skin tissue, wound repair involves coordination among resident skin cells, blood mononuclear cells, extracellular matrix, growth factors, and cytokines to complete the healing cascade.
Formation of Blood Clot
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Collagens are the Major Structural Proteins of ECM01:13

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Three main types of fibers are secreted by fibroblasts: collagen fibers, elastic fibers, and reticular fibers. Collagen fiber is made from fibrous protein subunits linked together to form a long, straight fiber. Collagen fibers, while flexible, have great tensile strength, resist stretching, and give ligaments and tendons their characteristic resilience and strength. These fibers hold connective tissues together, even during the body's movement.
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Dense Connective Tissue01:13

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Dense connective tissue contains more collagen fibers than loose connective tissue. As a consequence, it displays greater resistance to stretching. There are two major categories of dense connective tissue— regular and irregular.
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Structural Protein Function01:56

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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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Fibril-associated Collagen01:11

Fibril-associated Collagen

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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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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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Related Experiment Video

Updated: May 3, 2026

Preparation of 3D Collagen Gels and Microchannels for the Study of 3D Interactions In Vivo
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Collagen Organization Critical Role in Wound Contraction.

H Paul Ehrlich1, Thomas K Hunt2

  • 1Division of Plastic Surgery, Penn State University College of Medicine , Hershey, Pennsylvania.

Advances in Wound Care
|February 15, 2014
PubMed
Summary
This summary is machine-generated.

Wound contraction is driven by fibroblasts generating thicker collagen fibers through tractional forces, not by myofibroblasts using cell contraction. This clarifies the mechanism of open wound healing and collagen fiber thickening.

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Area of Science:

  • Biomedical Engineering
  • Cell Biology
  • Dermatology

Background:

  • Open wound closure relies on wound contraction, a process involving granulation tissue and collagen fiber thickening.
  • The precise mechanism driving wound contraction, particularly the roles of myosin ATPase and cell types, remains a subject of investigation.

Approach:

  • Investigated the mechanism of open wound contraction by analyzing the roles of fibroblasts and myofibroblasts.
  • Utilized polarized light microscopy to observe collagen fiber thickening during wound contraction.
  • Examined fibroblast-populated collagen lattices (FPCL) under different conditions to differentiate cellular mechanisms.

Key Points:

  • Myofibroblasts are present in granulation tissue but do not primarily drive wound contraction through cell contraction.
  • Fibroblasts, not myofibroblasts, are responsible for compacting collagen and generating thicker collagen fibers.
  • Rapid myosin ATPase activity in fibroblasts leads to collagen fibril condensation and fiber thickening.

Conclusions:

  • Wound contraction is primarily mediated by fibroblasts exerting tractional forces to generate thicker collagen fibers.
  • Sustained myosin ATPase in myofibroblasts generates cell contraction but does not significantly thicken collagen fibers.
  • The self-assembly properties of collagen, facilitated by fibroblast activity, are crucial for fiber thickening and wound repair.