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Enhancement of hemagglutination inhibition by complement
Infection and Immunity
|December 1, 1972
Summary
Early immunoglobulin M antibody and complement enhance influenza virus hemagglutination inhibition. Complement components C1, C2, and C4 are crucial for this antibody-mediated viral inhibition.
Area of Science:
- Immunology
- Virology
- Complement System
Background:
- Hemagglutination inhibition is a key assay for studying viral antibody responses.
- The role of complement in antibody-mediated viral inhibition is not fully understood.
Purpose of the Study:
- To investigate the effect of specific antibody and complement on hemagglutination inhibition of influenza virus.
- To identify the specific complement components involved in enhancing this inhibition.
Main Methods:
- Influenza virus hemagglutination inhibition assays were performed.
- Antibody and complement interactions were studied using fresh and treated guinea pig serum.
- Functionally purified complement components were utilized to determine their necessity and sufficiency.
Main Results:
- Early immunoglobulin M antibody effectively inhibited influenza virus hemagglutination.
- Fresh guinea pig serum significantly enhanced the inhibitory capacity of the antibody (4-8 fold).
- Complement inhibitors abolished the enhancing effect of guinea pig serum.
- Complement components C1, C2, and C4 were identified as necessary and sufficient for this enhancement.
Conclusions:
- Specific immunoglobulin M antibody plays a role in inhibiting influenza virus hemagglutination.
- The complement system, particularly components C1, C2, and C4, significantly enhances antibody-mediated hemagglutination inhibition of influenza virus.
- These findings elucidate the intricate interplay between antibodies and complement in antiviral immunity.