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Related Experiment Videos

Complement-dependent anaphylactic reactions.

B H Tom, S Raffel

    Infection and Immunity
    |June 1, 1975
    PubMed
    Summary
    This summary is machine-generated.

    Non-tissue-fixing antibodies can trigger anaphylactic reactions by activating complement. This study shows guinea pig immunoglobulin G2 complexes with antigen elicit dermal reactions, reduced by complement inactivation, supporting this mechanism.

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    Area of Science:

    • Immunology
    • Allergy Research
    • Complement System

    Background:

    • The mechanism of anaphylactic-type reactions induced by non-tissue-fixing antibodies is not well-established.
    • Antigen-antibody complexes can activate the complement system, releasing anaphylatoxins.
    • Understanding these pathways is crucial for diagnosing and treating hypersensitivity reactions.

    Purpose of the Study:

    • To investigate the role of non-tissue-fixing antibodies in eliciting anaphylactic-type reactions.
    • To demonstrate the involvement of complement activation and anaphylatoxin release in vivo.
    • To explore the pathways of immediate hypersensitivity.

    Main Methods:

    • Experimental induction of dermal reactions in guinea pigs using guinea pig immunoglobulin G2 (noncytotropic) complexed with antigen in vitro.

    Related Experiment Videos

  • Pretreatment of animals with cobra venom factor to inactivate complement.
  • Observation and comparison of dermal reactions in treated and untreated animals.

    • Main Results:

    • Guinea pig immunoglobulin G2 complexed with antigen successfully elicited dermal reactions.
    • Pretreatment with complement-inactivating cobra venom factor significantly diminished these dermal reactions.
    • These findings support the hypothesis of complement activation by non-tissue-fixing antibody complexes.

    Conclusions:

    • Non-tissue-fixing antibodies, specifically immunoglobulin G2, can elicit anaphylactic-type dermal reactions via complement activation.
    • The release of anaphylatoxins from antigen-antibody complexes plays a key role in these reactions.
    • This study provides experimental evidence for a specific pathway of immediate hypersensitivity.