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Related Experiment Videos

IgA and IgG immune complexes increase human macrophage C3 biosynthesis

J Laufer1, H Boichis, N Farzam

  • 1Samuel Jared Kushnick Pediatric Immunology Laboratory, Chaim Sheba Medical Center, Tel Hashomer, Israel.

Immunology
|February 1, 1995
PubMed
Summary

Immune complexes of IgA and IgG significantly increase C3 complement protein production by macrophages. This effect is independent of tumor necrosis factor (TNF), suggesting a direct pathway in immune complex-mediated diseases like IgA nephropathy.

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Area of Science:

  • Immunology
  • Cell Biology

Background:

  • Immune complexes play a role in inflammatory diseases.
  • Macrophages are key immune cells involved in inflammation.
  • The effect of immune complexes on macrophage complement production is not fully understood.

Purpose of the Study:

  • To investigate the impact of IgA and IgG immune complexes on complement protein production by human monocyte-derived macrophages.
  • To determine the role of tumor necrosis factor (TNF) in this process.

Main Methods:

  • Biosynthetic labeling, immunoprecipitation, SDS-PAGE, and autoradiography were used to analyze complement protein production.
  • Macrophage cultures were incubated with IgA and IgG immune complexes.
  • Tumor necrosis factor (TNF) production was measured.

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  • The effects of prednisolone and dexamethasone on TNF and C3 production were assessed.

    • Main Results:

    • Both IgA and IgG immune complexes consistently increased C3 production and secretion by macrophages after 24 hours.
    • No changes were observed in the biosynthesis of complement proteins factor B and C2.
    • Immune complexes significantly elevated macrophage TNF production.
    • Corticosteroids (prednisolone and dexamethasone) inhibited TNF production but not the C3 increase.

    Conclusions:

    • Macrophage C3 production is upregulated by IgA and IgG immune complexes via a TNF-independent pathway.
    • These findings are relevant to understanding local inflammation in IgA immune complex-mediated diseases, such as IgA nephropathy.