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Complement activation by a univalent hapten-antibody complex.

J W Goers, V N Schumaker, M M Glovsky

    The Journal of Biological Chemistry
    |July 10, 1975
    PubMed
    Summary
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    A specific univalent hapten-antibody complex effectively activates the serum complement system. This activation requires the hapten

    Area of Science:

    • Immunology
    • Biochemistry

    Background:

    • Antibody-hapten interactions are crucial in immunology.
    • The serum complement system is a key part of innate immunity.

    Purpose of the Study:

    • To investigate the ability of a univalent hapten-antibody complex to activate the serum complement system.
    • To identify the requirements for complement activation by this complex.

    Main Methods:

    • Sedimentation analysis to characterize the hapten-antibody complex.
    • Assays to measure complement component depletion upon activation.

    Main Results:

    • The univalent hapten, nonadeca lysyl epsilon-Dnp-lysine, forms a stable complex with rabbit anti-2,4-dinitrophenyl antibody.
    • This complex is a potent activator of the serum complement system.

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  • Complement activation necessitates specific binding groups on the hapten and a functional antibody region.
  • Depletion of complement components C1, C4, and C2 indicates involvement of the classical pathway.

    • Conclusions:

    • Univalent hapten-antibody complexes can activate the classical complement pathway.
    • Specific structural features of both the hapten and antibody are essential for complement activation.