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Related Experiment Videos

Complement activation in asymptomatic patients with sickle cell anaemia.

W A Wilson, E J Thomas, J G Sissons

    Clinical and Experimental Immunology
    |April 1, 1979
    PubMed
    Summary

    Patients with sickle cell anaemia (SCA) show complement activation, not defective synthesis, leading to lower levels of complement components like factor B. This explains their increased infection susceptibility.

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    Area of Science:

    • Immunology
    • Hematology

    Background:

    • Sickle cell anaemia (SCA) is associated with increased infection risk.
    • Previous studies suggested complement defects contribute to SCA's infection susceptibility.

    Purpose of the Study:

    • To investigate the nature of complement abnormalities in asymptomatic SCA patients.
    • To analyze factor B turnover and complement component levels in SCA.

    Main Methods:

    • Studied 87 asymptomatic SCA patients and a control group.
    • Measured serum concentrations of functional factors B and D, C3, and C4.
    • Analyzed factor B turnover using radiolabeling in a subset of patients.

    Main Results:

    • SCA patients had lower serum concentrations of functional factors B and D, C3, and C4 compared to controls.
    • A decreased ratio of functional factor B to total factor B protein indicated functional deficiency.
    • Increased fractional catabolic rate and synthesis of factor B were observed in SCA patients, suggesting complement activation.

    Conclusions:

    • Complement activation, not defective synthesis, underlies complement abnormalities in asymptomatic SCA patients.
    • These findings clarify the role of the complement system in SCA pathophysiology and infection risk.

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