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Related Experiment Videos

Complement activation by polymer binding IgG.

T Uchida, S Hosaka, Y Murao

    Biomaterials
    |September 1, 1984
    PubMed
    Summary
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    Immobilized immunoglobulin G (IgG) on polymer carriers activates the complement system. The type of polymer group and antibody fragment significantly influences complement activation, crucial for designing immunosorption therapies.

    Area of Science:

    • Biomaterials Science
    • Immunology
    • Polymer Chemistry

    Background:

    • The complement system is a critical part of innate immunity.
    • Immobilized antibodies are used in various biomedical applications, including immunosorption therapy.
    • Understanding complement activation by immobilized biomolecules is essential for optimizing these applications.

    Purpose of the Study:

    • To investigate the complement-activating properties of immobilized immunoglobulin G (IgG) on different polymer carriers.
    • To determine the influence of polymer functional groups and antibody fragment type on complement activation.
    • To provide insights for the design of effective immunosorption therapies.

    Main Methods:

    • Immobilization of intact IgG and F(ab')2 fragments onto various polymer microspheres.

    Related Experiment Videos

  • Detection of complement activation via polymer microsphere agglutination and rosette formation with complement receptor-bearing cells.
  • Evaluation of different polymer functional groups (amino, carboxyl, cyano, phenyl, hydroxyl, carbamoyl) and cross-linking agents (glutaraldehyde, dextran aldehyde).

    • Main Results:

    • Immobilized IgG on polymer carriers activates complement in serum.
    • Certain polymer functional groups (amino, carboxyl, cyano, phenyl) activate complement even without immobilized IgG.
    • Intact IgG activates complement more effectively than F(ab')2 fragments.
    • The choice of cross-linker (e.g., dextran aldehyde vs. glutaraldehyde) significantly impacts complement activation by F(ab')2 conjugates.

    Conclusions:

    • The immobilization strategy and polymer properties critically influence complement activation.
    • Minimizing complement activation by antibody fragments is achievable through careful selection of binders and immobilization methods.
    • These findings are vital for developing safer and more efficient immunosorption therapies.