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Related Experiment Videos

Type III group B Streptococcus: functional interaction with IgG subclass antibodies.

L B Givner, C J Baker, M S Edwards

    The Journal of Infectious Diseases
    |March 1, 1987
    PubMed
    Summary

    Immunoglobulin G2 (IgG2) is identified as a key opsonin for type III, group B Streptococcus (III-GBS). Divalency of the antibody molecule is crucial for alternative pathway-mediated opsonophagocytosis of III-GBS.

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    Area of Science:

    • Immunology
    • Microbiology
    • Bacteriology

    Background:

    • The specific roles of IgG subclasses in opsonophagocytosis of type III, group B Streptococcus (III-GBS) remain unclear.
    • Understanding the antibody fragments involved in III-GBS opsonophagocytosis is critical for vaccine development.

    Purpose of the Study:

    • To investigate the functionally active IgG subclasses mediating opsonophagocytosis of III-GBS.
    • To determine the antibody molecule portions responsible for III-GBS opsonophagocytosis.

    Main Methods:

    • Ion exchange chromatography was used to isolate IgG from immunized human serum.
    • Papain and pepsin digestion were employed to cleave IgG into subclasses and fragments (IgG2-rich pool, F(ab')2).
    • Opsonophagocytic activity against III-GBS was assessed using the isolated IgG and its fragments.

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    Main Results:

    • An IgG2-rich pool, containing 69% of III-GBS-specific antibody, retained significant opsonophagocytic activity.
    • F(ab')2 fragments showed similar alternative pathway-mediated opsonophagocytosis levels as intact IgG.
    • IgG2 was confirmed as an active opsonin for III-GBS.

    Conclusions:

    • Immunoglobulin G2 (IgG2) plays a significant role as an opsonin against type III, group B Streptococcus (III-GBS).
    • Antibody divalency is essential for effective alternative pathway-mediated opsonophagocytosis of III-GBS.