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Complement activation in pneumonia.

U Nydegger, J J Farquet, R Zubler

    Medical Microbiology and Immunology
    |January 1, 1979
    PubMed
    Summary
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    Infectious pneumonia involves increased complement component breakdown products (C3d) and synthesis, indicating active complement system involvement. Circulating immune complexes were rarely detected during this acute phase.

    Area of Science:

    • Immunology
    • Pulmonology
    • Biochemistry

    Background:

    • The complement system is crucial in innate immunity and inflammation.
    • Pneumonia involves complex inflammatory responses, potentially involving the complement cascade.
    • Understanding complement dynamics in infectious pneumonia is vital for therapeutic insights.

    Purpose of the Study:

    • To investigate complement system activation and component levels during acute infectious pneumonia.
    • To assess the presence of circulating immune complexes in patients with pneumonia.

    Main Methods:

    • Serial plasma samples were collected from 10 patients with infectious pneumonia.
    • Complement hemolytic activity and levels of C1q, C4, C3, and factor B were measured.
    • Levels of C3 breakdown products (C3d) and circulating immune complexes (using 125I-Clq Binding Test) were assessed.

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    Main Results:

    • Most patients exhibited normal or elevated levels of complement components (C1q, C4, C3, factor B) and hemolytic activity.
    • Six out of ten patients showed significantly increased C3 breakdown products (C3d) within the first three days.
    • Circulating immune complexes were detected in only two patients.

    Conclusions:

    • Acute infectious pneumonia is associated with complement hypercatabolism, evidenced by increased C3d levels.
    • Concurrently, there appears to be hypersynthesis of certain complement components.
    • The complement system is actively engaged during pneumonia, though circulating immune complexes are not consistently prominent.