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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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Updated: Jan 14, 2026

Production of Nanofibrillar Patterned Collagen for Tissue Engineering
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Collagen I-Derived Extracellular Matrix Motifs Alter Fibroblast Regenerative Response.

Opemipo Sanyaolu1, Victoria Garza1, Athena Santi1

  • 1Biomedical Engineering and Chemical Engineering, University of Texas at San Antonio, San Antonio, Texas, USA.

Cells, Tissues, Organs
|October 20, 2025
PubMed
Summary

Extracellular matrix motifs (mECMs) derived from damaged collagen can modulate fibroblast behavior, promoting a regenerative response. These damage-associated molecular patterns (DAMPs) show potential as immunomodulatory therapeutics for tissue regeneration.

Keywords:
Biomedical engineeringExtracellular matrixImmunomodulationTissue regenerationWound healing

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Area of Science:

  • Biomaterials Science
  • Regenerative Medicine
  • Immunology

Background:

  • Damage-associated molecular patterns (DAMPs) are released during tissue damage to aid regeneration.
  • Extracellular matrix (ECM) components, when damaged, can act as DAMPs.
  • Selective modulation of inflammation via DAMPs is a promising strategy for regenerative medicine.

Purpose of the Study:

  • To investigate the use of extracellular matrix motifs (mECMs) as DAMPs for tissue regeneration.
  • To assess fibroblast response to mECMs in different presentations (soluble vs. insoluble).

Main Methods:

  • mECMs were generated from UV-damaged rat tail collagen I.
  • Fibroblast responses were evaluated based on viability, proliferation, cell phenotype, and cytokine secretion.
  • Comparisons were made between soluble mECMs, insoluble mECMs, and a collagen control.

Main Results:

  • Soluble mECMs altered fibroblast phenotype, decreasing proliferation and increasing elongated cells.
  • Mobile mECMs significantly increased cytokine secretion compared to bound mECMs.
  • Both bound and soluble mECMs affected fibroblast behavior differently than the control.

Conclusions:

  • Fibroblasts recognize mECMs, with presentation significantly influencing their response.
  • Exposed cryptic regions in mobile mECMs may induce a myofibroblast-like phenotype.
  • DAMPs, specifically mECMs, hold potential as immunomodulatory agents for tissue regeneration.