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Related Experiment Videos

Alpha 2-macroglobulin is a binding protein for basic fibroblast growth factor.

P A Dennis1, O Saksela, P Harpel

  • 1Department of Cell Biology, New York University School of Medicine, New York 10016.

The Journal of Biological Chemistry
|May 5, 1989
PubMed
Summary
This summary is machine-generated.

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Basic fibroblast growth factor (bFGF) forms high molecular weight complexes with alpha 2-macroglobulin (alpha 2M) in human serum. This binding reduces bFGF

Area of Science:

  • Biochemistry
  • Molecular Biology
  • Cell Biology

Background:

  • Basic fibroblast growth factor (bFGF) is a key regulator of cell growth and differentiation.
  • Alpha 2-macroglobulin (alpha 2M) is a large plasma proteinase inhibitor with diverse biological functions.
  • The interaction between growth factors and plasma proteins can influence their bioavailability and activity.

Purpose of the Study:

  • To investigate the interaction between basic fibroblast growth factor (bFGF) and alpha 2-macroglobulin (alpha 2M) in human serum.
  • To characterize the nature and functional consequences of the bFGF-alpha 2M complex.

Main Methods:

  • Incubation of 125I-labeled bFGF with human serum or plasma.
  • Analysis of molecular mass forms by SDS-PAGE and autoradiography.

Related Experiment Videos

  • Immunoprecipitation using anti-alpha 2M antiserum.
  • Complex formation assays with purified alpha 2M and bFGF under various conditions (e.g., presence of inhibitors, heparin, other growth factors).
  • Binding studies to bFGF receptors on BHK-21 cells.
  • Functional assays measuring plasminogen activator production in epithelial cells.

    • Main Results:

    • 125I-bFGF forms high molecular mass complexes (>200 kDa) in human serum/plasma.
    • These complexes are specifically immunoprecipitated by anti-alpha 2M antibodies, indicating alpha 2M binding.
    • A covalent, specific, and saturable complex is formed between purified alpha 2M and bFGF.
    • Complex formation is inhibited by reagents modifying alpha 2M's reactive site (e.g., N-ethylmaleimide) but unaffected by heparin.
    • Methylamine treatment of alpha 2M enhances bFGF binding.
    • Other growth factors like aFGF and TGF-beta compete for alpha 2M binding, but platelet-derived growth factor does not.
    • The bFGF-alpha 2M complex exhibits reduced binding to bFGF receptors and diminished ability to stimulate plasminogen activator production.

    Conclusions:

    • Basic fibroblast growth factor (bFGF) covalently binds to alpha 2-macroglobulin (alpha 2M) in human plasma.
    • This interaction forms a stable complex that alters bFGF's biological activity.
    • Alpha 2M may act as a carrier or modulator of bFGF function in vivo.