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Methods for Quantitative Detection of Antibody-induced Complement Activation on Red Blood Cells
06:29

Methods for Quantitative Detection of Antibody-induced Complement Activation on Red Blood Cells

Published on: January 29, 2014

Association of complement activation and elevated plasma-C5a with adult respiratory distress syndrome.

D E Hammerschmidt, L J Weaver, L D Hudson

    Lancet (London, England)
    |May 3, 1980
    PubMed

    Insights

    Polymorphonuclear granulocyte (PMN) aggregation, driven by complement activation (C5a), is linked to adult respiratory distress syndrome (ARDS) development. Elevated C5a levels may predict ARDS, supporting corticosteroid use.

    Area of Science:

    • Immunology
    • Pulmonology
    • Critical Care Medicine

    Background:

    • Polymorphonuclear granulocyte (PMN) aggregation, stimulated by activated complement (C), is implicated in adult respiratory distress syndrome (ARDS) pathogenesis.
    • Aggregated PMNs can lodge in pulmonary vasculature, causing dysfunction and contributing to ARDS.
    • PMN-aggregating activity in plasma correlates with complement fragment C5a levels.

    Purpose of the Study:

    • To investigate the correlation between PMN-aggregating activity and ARDS development in at-risk patients.
    • To assess the predictive value of elevated C5a levels for ARDS onset.
    • To evaluate the potential therapeutic implications of PMN aggregation findings.

    Main Methods:

    • Plasma samples from 61 patients at risk for ARDS were analyzed for PMN-aggregating activity.
    • C5a levels were measured in plasma samples.
    • Correlation analyses were performed between PMN-aggregating activity, C5a levels, and ARDS development, including subgroup analysis excluding sepsis patients.

    Main Results:

    • A strong, significant correlation was observed between plasma PMN-aggregating activity and ARDS development.
    • This correlation remained significant even when patients with sepsis were excluded.
    • Prospective monitoring indicated that elevated C5a levels were a useful predictor of ARDS.

    Conclusions:

    • PMN aggregation in response to complement activation plays a significant role in ARDS genesis.
    • Elevated C5a levels serve as a potential early predictor for ARDS.
    • The findings support the use of corticosteroids, known to inhibit PMN aggregation, in managing ARDS.

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