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A monoclonal IgG4 (lambda) with factor V inhibitory activity.

P E Hurtubise, M C Coots, D J Jacob

    Journal of Immunology (Baltimore, Md. : 1950)
    |May 1, 1979
    PubMed
    Summary
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    Researchers identified a specific monoclonal immunoglobulin G4 (lambda) that inhibits human coagulation factor V. This finding is crucial for understanding rare bleeding disorders and developing targeted therapies.

    Area of Science:

    • Hematology
    • Immunology
    • Biochemistry

    Background:

    • Acquired inhibitors of coagulation factors can cause severe bleeding disorders.
    • Monoclonal immunoglobulins are sometimes associated with autoimmune phenomena, including factor inhibitors.

    Purpose of the Study:

    • To isolate and characterize the inhibitor of human coagulation factor V found in a patient with fatal hemorrhagic diathesis.
    • To determine the nature of the inhibitor, specifically its immunoglobulin class and light chain type.

    Main Methods:

    • Isolation of the inhibitor using DE-52 ion exchange chromatography and isoelectric focusing.
    • Characterization using protein electrophoresis, immunoelectrophoresis, and isoelectric focusing.
    • Neutralization assays with specific antisera for immunoglobulin class, subclass, and light chain type.

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    Main Results:

    • A monoclonal immunoglobulin G4 (lambda) with inhibitory activity against human coagulation factor V was successfully isolated.
    • The inhibitor was confirmed as a monoclonal immunoglobulin of restricted mobility.
    • This represents the first documented case of a factor V inhibitor identified as a monoclonal IgG4 (lambda).

    Conclusions:

    • The study demonstrates that a monoclonal IgG4 (lambda) can function as a potent inhibitor of human coagulation factor V.
    • This finding provides critical insights into the pathogenesis of acquired factor V inhibitors and associated bleeding disorders.
    • Further research into such specific monoclonal inhibitors may lead to novel diagnostic and therapeutic strategies.