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IgA-dependent, monocyte-mediated, antibacterial activity.

G H Lowell, L F Smith, J M Griffiss

    The Journal of Experimental Medicine
    |August 1, 1980
    PubMed
    Summary
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    Immunoglobulin A (IgA) from recovered patients fights Group C meningococcal bacteria. This antibody-mediated immunity occurs without complement, highlighting a key defense mechanism against bacterial meningitis.

    Area of Science:

    • Immunology
    • Microbiology
    • Infectious Diseases

    Background:

    • Disseminated Group C meningococcal disease poses a significant public health threat.
    • Understanding the mechanisms of host defense against Neisseria meningitidis is crucial for developing effective treatments and vaccines.
    • The role of immunoglobulin A (IgA) in combating bacterial infections, particularly in the absence of complement, requires further elucidation.

    Purpose of the Study:

    • To investigate the in vitro anti-meningococcal activity induced by purified IgA from convalescent patients.
    • To determine if this activity is complement-dependent or mediated by other host factors.
    • To characterize the target of IgA-mediated antibacterial action on Group C meningococcal bacteria.

    Main Methods:

    • Purification of IgA from the sera of patients who recovered from disseminated Group C meningococcal disease.

    Related Experiment Videos

  • In vitro assays to assess the anti-meningococcal activity of purified IgA against Group C Neisseria meningitidis.
  • Experiments conducted in the absence of complement to evaluate IgA's intrinsic antibacterial capabilities.
  • Quantification of IgA binding to the Group C polysaccharide (Csss) capsule.
  • Analysis of the influence of incubation time, temperature, and monocyte concentration on antibacterial activity.

    • Main Results:

    • Purified IgA induced human monocyte-mediated anti-meningococcal activity in vitro, independent of complement.
    • Both IgA- and IgG-dependent activities were specifically directed against the Group C meningococcal polysaccharide (Csss) capsule.
    • Effective concentrations of IgA required minimal binding to the Csss capsule (less than 1 ng).
    • Antibacterial activity demonstrated a dependency on incubation length, temperature, and monocyte concentration.

    Conclusions:

    • IgA plays a significant role in combating disseminated Group C meningococcal disease through complement-independent, monocyte-mediated mechanisms.
    • The findings suggest that IgA targeting the Csss capsule is a critical component of local, cell-mediated antibacterial immunity.
    • This mechanism offers insights into host defense strategies against meningococcal infections and potential therapeutic targets.