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Related Experiment Videos

Basic FGF and TGF-beta differentially modulate integrin expression of human microvascular endothelial cells.

J Enenstein1, N S Waleh, R H Kramer

  • 1Department of Anatomy, University of California, San Francisco 94143.

Experimental Cell Research
|December 1, 1992
PubMed
Summary

Basic fibroblast growth factor (bFGF) and transforming growth factor-beta (TGF-beta) alter endothelial cell behavior by changing integrin expression. This influences cell migration and interactions with the extracellular matrix during neovascularization.

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Area of Science:

  • Cell Biology
  • Molecular Biology
  • Biochemistry

Background:

  • Basic fibroblast growth factor (bFGF) and transforming growth factor-beta (TGF-beta) are key cytokines regulating endothelial cell functions.
  • These growth factors are known to influence endothelial cell migration, proliferation, and angiogenesis.
  • Integrins, as cell adhesion receptors, are potential mediators of these cytokine-induced effects.

Purpose of the Study:

  • To investigate how bFGF and TGF-beta modulate the expression of specific integrins in human microvascular endothelial cells (MEC).
  • To understand the role of integrin regulation in cytokine-driven endothelial cell responses relevant to neovascularization.

Main Methods:

  • Human microvascular endothelial cells (MEC) were treated with bFGF and TGF-beta.

Related Experiment Videos

  • Metabolic labeling and immunoprecipitation were used to assess changes in integrin biosynthesis.
  • Quantitative analysis of mRNA levels for specific integrin subunits was performed.

    • Main Results:

    • bFGF upregulated the biosynthesis of integrins alpha 2, alpha 5, beta 1, and beta 3.
    • bFGF also increased mRNA levels for alpha 2 and beta 1 integrin subunits.
    • TGF-beta enhanced the synthesis of alpha 2, alpha 5, and beta 1 integrins.

    Conclusions:

    • bFGF and TGF-beta selectively alter the integrin expression profile of MEC.
    • These alterations in integrin expression influence endothelial cell interactions with the extracellular matrix.
    • Upregulation of the alpha 2 beta 1 integrin by bFGF may enhance endothelial cell migration during neovascularization.