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Related Experiment Videos

Photodynamic therapy inhibits cell adhesion without altering integrin expression

P Margaron1, R Sorrenti, J G Levy

  • 1QLT PhotoTherapeutics Inc., Vancouver, Canada. pmargaro@qlt-pdt.com

Biochimica Et Biophysica Acta
|January 20, 1998
PubMed
Summary

Photodynamic therapy (PDT) inhibits human foreskin fibroblast (HFF) cell adhesion to extracellular matrices. PDT affects integrin signaling pathways without altering cell membrane integrity or integrin expression.

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Area of Science:

  • Cell Biology
  • Biochemistry
  • Photomedicine

Background:

  • Cell adhesion is crucial for fundamental biological processes like inflammation and tissue repair.
  • Photodynamic therapy (PDT) is a treatment modality with potential effects on cellular functions.
  • Understanding PDT's impact on cell adhesion is vital for its therapeutic applications.

Purpose of the Study:

  • To investigate the effects of photodynamic therapy (PDT) on human foreskin fibroblast (HFF) cell adhesion.
  • To determine if PDT affects cell membrane integrity or integrin expression during adhesion assays.
  • To elucidate the molecular mechanisms underlying PDT-induced changes in cell adhesion.

Main Methods:

  • Human foreskin fibroblasts (HFFs) were treated with photodynamic therapy (PDT) using verteporfin.

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  • Cell adhesion assays were performed on collagen type I, vitronectin, and fibronectin.
  • Cell membrane integrity and integrin expression were assessed post-PDT.
  • Western blotting and immunoprecipitation were used to analyze protein phosphorylation, including focal adhesion kinase.

    • Main Results:

    • PDT significantly inhibited HFF cell adhesion in a dose-dependent manner.
    • No significant differences in adhesion inhibition were observed across different extracellular matrices.
    • PDT did not affect HFF membrane integrity or cell surface integrin expression within 2 hours.
    • PDT suppressed adhesion-induced phosphorylation of key signaling proteins (110-130 kDa) and focal adhesion kinase.

    Conclusions:

    • PDT inhibits cell adhesion by interfering with integrin signaling pathways.
    • These effects occur independently of alterations in cell membrane integrity or integrin expression.
    • PDT's impact on cell adhesion signaling warrants further investigation for therapeutic implications.