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B-lymphocyte function in cystic fibrosis.

R U Sorensen, O Ruuskanen, K Miller

    European Journal of Respiratory Diseases
    |October 1, 1983
    PubMed
    Summary
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    Cystic fibrosis patients show altered B-cell function, with increased spontaneous immunoglobulin production in milder disease but impaired responses to stimulation. This immune dysregulation may explain infection susceptibility.

    Area of Science:

    • Immunology
    • Pulmonology
    • Genetics

    Background:

    • Cystic fibrosis (CF) patients exhibit increased susceptibility to chronic bacterial lung infections, particularly Pseudomonas aeruginosa.
    • The underlying immunological mechanisms contributing to this susceptibility remain incompletely understood.

    Purpose of the Study:

    • To investigate peripheral blood B-cell function in cystic fibrosis patients chronically colonized with Pseudomonas aeruginosa.
    • To correlate B-cell function with pulmonary disease severity in CF.

    Main Methods:

    • Assessed spontaneous and mitogen-induced plaque-forming cells (reflecting B-cell differentiation) in 21 CF patients and healthy controls.
    • Evaluated B-cell responses to pokeweed mitogen and staphylococci in vitro.
    • Investigated the role of suppressor cells and T-lymphocytes in B-cell dysfunction.

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    Main Results:

    • CF patients displayed significantly higher spontaneous plaque-forming cells compared to controls, particularly those with less severe lung disease.
    • Patients with advanced pulmonary disease had similar levels of spontaneous immunoglobulin-secreting cells as normal individuals.
    • Both CF patient groups showed impaired B-cell differentiation upon in vitro polyclonal activation, independent of suppressor cell activity.

    Conclusions:

    • Altered B-cell function, including increased spontaneous immunoglobulin production and impaired activation responses, is present in cystic fibrosis patients.
    • These B-cell abnormalities may contribute to the increased susceptibility to bacterial infections and the development of hypersensitivity reactions in CF.
    • The findings highlight the complex immune dysregulation in CF beyond T-cell suppression.