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Effect of concanavalin A on the classical complement pathway

J J Langone, M D Boyle, T Borsos

    Journal of Immunology (Baltimore, Md. : 1950)
    |May 1, 1977
    PubMed
    Summary
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    Concanavalin A (Con A) inhibits sheep erythrocyte lysis by blocking early complement components C1 and C2. This lectin directly interacts with C2, affecting complement system function.

    Area of Science:

    • Immunology
    • Biochemistry

    Background:

    • Sheep erythrocytes sensitized with anti-Forssman antiserum (EA) are used to study the complement system.
    • Guinea pig complement (GPC) mediates the lysis of EA cells.
    • Concanavalin A (Con A) is a lectin known to interact with various biological molecules.

    Purpose of the Study:

    • To investigate the inhibitory effect of Concanavalin A (Con A) on the lysis of sensitized sheep erythrocytes mediated by guinea pig complement (GPC).
    • To elucidate the specific complement components and mechanisms affected by Con A.

    Main Methods:

    • Hemolysis assays using sheep erythrocytes (E) sensitized with anti-Forssman antiserum (EA).
    • Titration of guinea pig complement (GPC) in the presence of varying concentrations of Concanavalin A (Con A).
    • tmax experiments to assess the kinetics of complement component interactions.

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    Main Results:

    • Concanavalin A (Con A) significantly inhibited the lysis of EA by GPC in a dose-dependent manner.
    • Con A's inhibitory effect was primarily on fluid-phase C1 and C2, with no significant impact on cell-bound components.
    • tmax experiments indicated a direct interaction between Con A and C2, without affecting C2 binding sites on EAC14 cells.

    Conclusions:

    • Concanavalin A (Con A) acts as an inhibitor of the early classical complement pathway by targeting C1 and C2.
    • The interaction is specific to C2, suggesting a potential regulatory role for lectins in complement activation.
    • Other tested lectins and mitogens did not exhibit similar inhibitory effects on hemolysis.