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Related Experiment Videos

Relationships between alternative complement pathway activation, C-reactive protein, and pneumococcal infection.

R A Rabinovitch, S M Koethe, J H Kalbfleisch

    Journal of Clinical Microbiology
    |January 1, 1986
    PubMed
    Summary

    Severe pneumococcal disease is linked to reduced alternative complement pathway (AP) factors, especially with high C-reactive protein (CRP) levels. CRP may boost AP activation as a key defense mechanism.

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    Area of Science:

    • Immunology
    • Microbiology
    • Infectious Disease

    Background:

    • Opsonization of Streptococcus pneumoniae (PNC) without specific antibody can involve the alternative complement pathway (AP) or C-reactive protein (CRP).
    • Understanding these mechanisms is crucial for managing pneumococcal disease severity.

    Purpose of the Study:

    • To investigate the roles of AP and CRP in pneumococcal disease pathogenesis.
    • To correlate complement component levels and activation with disease severity.

    Main Methods:

    • Studied 19 patients with varying pneumococcal infection severity.
    • Measured C4, CRP levels, and zymosan-induced 50% hemolytic complement (CH50) activity in acute and weekly sera.
    • Analyzed complement consumption and its relation to PNC serotypes and CRP levels.

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    Main Results:

    • Patients with complicated illness had significantly lower acute CH50 and zymosan-induced complement consumption compared to uncomplicated cases.
    • Lower-numbered PNC serotypes correlated with reduced AP factor availability, irrespective of illness severity.
    • Higher CRP levels were inversely associated with zymosan-induced complement activation in complicated illness.

    Conclusions:

    • In vivo depletion of AP factors is more pronounced in complicated pneumococcal illness and linked to elevated CRP.
    • C-reactive protein may augment alternative pathway activation, acting as a crucial pre-antibody defense.
    • These findings highlight the interplay between complement, CRP, and pneumococcal disease outcomes.