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[Effect of mercaptans on serum IgA].

A Angeretti, C Merlino, B Ferrara

    Bollettino Dell'Istituto Sieroterapico Milanese
    |January 1, 1986
    PubMed
    Summary

    Dithiothreitol (DTT) reduction affects antibody function. Immunoglobulin M (IgM) loses antigen binding but remains detectable, while Immunoglobulin A (IgA) loses both antigen binding and detectability with higher DTT concentrations.

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    Area of Science:

    • Immunology
    • Biochemistry

    Context:

    • Antibody structure and function are critical in immune responses.
    • Reducing agents like dithiothreitol (DTT) are used to study antibody disulfide bonds.

    Purpose:

    • To investigate the differential effects of dithiothreitol (DTT) reduction on Immunoglobulin M (IgM) and Immunoglobulin A (IgA) function.
    • To compare the impact of reduction on antigen-binding capacity versus antibody detectability.

    Summary:

    • Dithiothreitol (DTT) at 2.5 mM inactivates IgM's antigen-binding ability while retaining detectability by anti-IgM antiserum.
    • Immunoglobulin A (IgA) is more resistant to reduction; higher DTT concentrations abolish both antigen binding and detectability by anti-IgA antiserum.
    • The method of detection influences the apparent inactivation of IgA after mild reduction, with ELISA showing greater activity loss than Hemagglutination Inhibition (HAI).

    Impact:

    • Understanding the differential sensitivity of antibody isotypes to reduction is crucial for interpreting experimental results.
    • This research highlights the importance of considering assay methodology when evaluating antibody functional activity post-treatment.
    • Findings inform the selection of appropriate experimental conditions for studying antibody-antigen interactions and immune complex formation.

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