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Related Experiment Videos

A sensitive method for specific quantitation of secretory IgA.

A S Akerlund, L A Hanson, S Ahlstedt

    Scandinavian Journal of Immunology
    |January 1, 1977
    PubMed
    Summary
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    A new enzyme-linked immunosorbent assay accurately measures secretory IgA (SIgA) in biological fluids. This method is reliable and unaffected by other IgA forms or common secretion variations.

    Area of Science:

    • Immunology
    • Biochemistry
    • Analytical Chemistry

    Background:

    • Accurate quantification of secretory IgA (SIgA) is crucial for understanding mucosal immunity.
    • Existing methods for SIgA measurement often face interference from serum IgA and free secretory component (SC).
    • Variations in sample pH and osmolarity can also affect assay reliability.

    Purpose of the Study:

    • To develop and validate a novel enzyme-linked immunosorbent assay (ELISA) for the specific and reliable quantification of secretory IgA (SIgA).
    • To assess the assay's performance in various biological fluids, including milk, urine, and saliva.
    • To evaluate the assay's robustness against common interfering substances and environmental factors.

    Main Methods:

    • Development of an ELISA utilizing anti-alpha antibodies immobilized on plastic tubes for IgA adsorption.

    Related Experiment Videos

  • Quantification of bound SIgA using an antiserum against the secretory component conjugated with alkaline phosphatase.
  • Validation of the assay in biological samples like milk, urine, and saliva.

    • Main Results:

    • The developed ELISA demonstrated high reproducibility (+/-7%) for SIgA quantification.
    • The assay accurately measured SIgA down to 0.03 mg/l in various biological fluids.
    • Measurements were not affected by the presence of serum IgA (up to 157%) or free secretory component (SC).
    • Assay performance remained consistent despite variations in pH and osmolarity within physiological ranges.

    Conclusions:

    • A robust and specific ELISA method for quantifying SIgA has been successfully developed.
    • This assay overcomes limitations of previous techniques, offering reliable SIgA measurements in diverse biological samples.
    • The method's stability against interfering substances and physiological variations enhances its utility in immunological research and diagnostics.