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[Common variable immunodeficiency: an immunological study (author's transl)].

K S Tsai, C Y Chuang, K H Hsieh

    Zhonghua Minguo Wei Sheng Wu Ji Mian Yi Xue Za Zhi = Chinese Journal of Microbiology and Immunology
    |March 1, 1980
    PubMed
    Summary

    This study identifies an intrinsic B cell defect as the cause of hypogammaglobulinemia in a young patient with recurrent infections. The B cells could not produce or secrete most immunoglobulin classes.

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    Area of Science:

    • Immunology
    • Clinical Medicine

    Background:

    • Recurrent sinopulmonary infections and diarrhea in adolescents can indicate primary immunodeficiency.
    • Hypogammaglobulinemia, characterized by low immunoglobulin levels, impairs the immune system's ability to fight infections.

    Observation:

    • A 17-year-old male presented with recurrent sinopulmonary infections and diarrhea, exhibiting marked hypogammaglobulinemia.
    • Serum IgG levels were low (240 mg/dl), with undetectable levels of other immunoglobulin classes (IgA, IgM, IgE) via Mancini technique.
    • Polymorphonuclear leukocyte function and complement system were normal, ruling out certain immune deficiencies.

    Findings:

    • While T and B lymphocyte counts were normal, the patient's B cells demonstrated an intrinsic defect.
    • These B cells could only produce subnormal amounts of IgG and were incapable of secreting other immunoglobulin classes.

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  • No evidence of hyperactive suppressor T cells or inadequate helper T cell function was observed.

    • Implications:

    • This case highlights an intrinsic B cell defect as a distinct immunopathogenic mechanism for hypogammaglobulinemia.
    • Understanding this defect is crucial for accurate diagnosis and management of patients with recurrent infections and low immunoglobulin levels.
    • Further research into B cell intrinsic defects can improve diagnostic strategies for primary immunodeficiencies.