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Intrinsically stable IgG aggregates

D McCarthy, D H Goddard, B K Pell

    Journal of Immunological Methods
    |January 1, 1981
    PubMed
    Summary
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    Measuring light scattering at 40 nm reliably assesses heat-induced aggregation in immunoglobulin G (IgG) solutions. Aggregation rates are temperature-dependent, with significant increases near 63°C, impacting immune complex assays.

    Area of Science:

    • Biochemistry
    • Immunology
    • Protein Chemistry

    Background:

    • Heat-induced aggregation of immunoglobulin G (IgG) is crucial for immune complex assays.
    • Accurate characterization of IgG aggregates is essential for assay reliability.

    Purpose of the Study:

    • To establish a simple and reliable method for quantifying IgG aggregation.
    • To investigate the temperature dependence and kinetics of IgG aggregation.
    • To assess the stability and purification of heat-aggregated IgG.

    Main Methods:

    • Measurement of absorbance due to light scattering at 40 nm to quantify IgG aggregation.
    • Heat treatment of IgG solutions at varying temperatures.
    • Precipitation of IgG aggregates using 3.5% polyethylene glycol (PEG).

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    Main Results:

    • Light scattering at 40 nm effectively measures IgG aggregation extent.
    • Aggregation rate shows strong temperature dependence, with a critical inflexion near 63°C.
    • IgG aggregate size increases over time during heating; aggregates are stable and purifiable with PEG.

    Conclusions:

    • Light scattering is a practical method for monitoring IgG aggregation.
    • Understanding the temperature-dependent kinetics of IgG aggregation is vital for production.
    • Heat-aggregated IgG is stable and can be purified, with implications for immune complex assay development.