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Activation of transforming growth factor-beta by the integrin alphavbeta8 delays epithelial wound closure

Claus Neurohr1, Stephen L Nishimura, Dean Sheppard

  • 1Department of Medicine, Lung Biology Center, University of California, San Francisco, 94143-2922, USA.

American Journal of Respiratory Cell and Molecular Biology
|April 1, 2006
PubMed

Insights

Transforming growth factor-beta (TGF-β) acts as a brake on wound closure. Blocking TGF-β signaling, particularly TGF-β1, significantly enhances epithelial wound healing.

Area of Science:

  • Cell Biology
  • Wound Healing Research
  • Epithelial Biology

Background:

  • Transforming growth factor-beta (TGF-β) family members influence wound repair processes like cell proliferation, matrix production, and inflammation.
  • The specific role of TGF-β in the rate of wound closure has been a subject of debate.
  • Airway epithelial cells are crucial in airway repair and express various TGF-β isoforms and integrins.

Purpose of the Study:

  • To investigate the precise role of TGF-β signaling in regulating the speed of epithelial wound closure.
  • To determine the differential effects of TGF-β1 and TGF-β2 on scratch wound healing in airway epithelial cells.
  • To elucidate the involvement of integrins αvβ6 and αvβ8 in TGF-β activation and subsequent wound closure.

Main Methods:

  • Utilized scratch wound assays in primary airway epithelial cell monolayers.
  • Employed blocking antibodies against TGF-β, TGF-β1, TGF-β2, αvβ6, and αvβ8 to modulate signaling pathways.
  • Quantified the degree of wound closure under different experimental conditions.

Main Results:

  • Blocking TGF-β antibodies significantly increased the rate of scratch wound closure.
  • Exogenous TGF-β1 addition inhibited wound closure, while TGF-β2 had no significant effect.
  • Wounding induced TGF-β activation via both αvβ6 and αvβ8 integrins.
  • Antibodies targeting αvβ8 enhanced wound closure, whereas αvβ6 blockade did not alter closure rates.

Conclusions:

  • Endogenous TGF-β signaling, particularly TGF-β1, acts as a natural inhibitor of epithelial wound closure.
  • Integrin-mediated activation of TGF-β1 by αvβ8 plays a critical role in regulating the pace of airway epithelial wound repair.
  • Targeting specific TGF-β isoforms and their activating integrins may offer therapeutic strategies for enhancing wound healing.

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