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Defective opsonization. A common immunity deficiency

J F Soothill, B A Harvey

    Archives of Disease in Childhood
    |February 1, 1976
    PubMed
    Summary
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    A defect in serum opsonization impairs phagocytosis in children with frequent infections. This immune defect, possibly inherited, can be corrected by normal plasma, suggesting a missing factor.

    Area of Science:

    • Immunology
    • Genetics

    Background:

    • Frequent infections in children can stem from underlying immune system deficiencies.
    • Serum opsonization is a critical process for phagocytosis, enhancing the engulfment of pathogens by immune cells.

    Purpose of the Study:

    • To investigate a defect in serum opsonization for phagocytosis in children experiencing recurrent infections.
    • To explore the inheritance pattern and potential mechanisms of this immune defect.

    Main Methods:

    • Assessed serum opsonization and yeast phagocytosis in children with frequent infections and their families.
    • Compared defect incidence in affected children versus healthy adults and children with other diseases.
    • Investigated the effect of normal plasma on defective serum function in vitro and in vivo.

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    Main Results:

    • Eleven of 43 children with frequent infections exhibited defective serum opsonization for phagocytosis.
    • A similar defect was observed in mothers, suggesting dominant inheritance.
    • The defective function was correctable by normal plasma, indicating a deficiency rather than an inhibitor.

    Conclusions:

    • A primary defect in serum opsonization is implicated in unexplained frequent infections in some children.
    • The defect appears to be inherited, likely through an unusual dominant pattern.
    • The findings suggest a specific missing factor in the serum responsible for impaired phagocytosis.