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Related Experiment Videos

EAC4 and EAC14 production without purified Ci.

W D Linscott

    Journal of Immunology (Baltimore, Md. : 1950)
    |December 1, 1975
    PubMed
    Summary

    Researchers developed highly active EAC4 and EAC14 complement components using TTHA. IgG-sensitized cells showed greater reactivity, and preparations were stable during cold storage, indicating potential for diagnostic applications.

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    Area of Science:

    • Immunology
    • Complement system research

    Background:

    • The complement system is crucial for innate and adaptive immunity.
    • Efficient preparation of complement components like C1, C4, and C2 is vital for immunological assays.

    Purpose of the Study:

    • To develop highly active EAC4 and EAC14 (erythrocyte-antibody-complement complexes with C4 and C1,4 deposited, respectively).
    • To optimize conditions for complement component preparation and assess the stability of the resulting complexes.

    Main Methods:

    • Sensitized red blood cells were treated with human or guinea pig serum and TTHA (a chelating agent) at low pH.
    • C2 contamination in guinea pig complement preparations was removed by decay at 37°C.
    • Reactivity was compared between cells sensitized with IgG, IgM, or whole serum, and between TTHA-complement and purified C1 plus EDTA-complement preparations.

    Main Results:

    • High-activity EAC4 and EAC14 were successfully prepared using TTHA.
    • IgG-sensitized cells demonstrated higher reactivity compared to IgM or whole serum sensitization.
    • Preparations utilizing TTHA-complement were more reactive than those using purified C1 plus EDTA-complement.
    • EAC14 complexes showed minimal activity loss after 3 weeks of storage at 0°C.

    Conclusions:

    • TTHA facilitates the preparation of highly active complement components (EAC4 and EAC14).
    • IgG sensitization enhances the reactivity of complement-sensitized cells.
    • The prepared EAC14 complexes exhibit good stability, suggesting their utility in immunological studies and diagnostics.

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