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[HLA-DR antigens: cellular expression and molecular structure].

D J Charron

    Annales D'Immunologie
    |September 1, 1982
    PubMed
    Summary

    The Human Leukocyte Antigen (HLA)-DR antigens, crucial for immune responses, are complex glycoproteins. Structural analysis reveals polymorphism primarily in the beta chain, impacting immune cell interactions.

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    Area of Science:

    • Immunogenetics
    • Molecular immunology
    • Cellular biology

    Context:

    • The Human Leukocyte Antigen (HLA) complex, particularly the HLA-D region, plays a central role in immune phenomena, including mixed lymphocyte and graft-versus-host reactions.
    • HLA-DR antigens are key mediators of cell-cell interactions essential for immune responses.
    • Monoclonal antibodies targeting HLA-DR antigens facilitate investigations into human Ia antigen expression and synthesis on immune cells.

    Purpose:

    • To investigate the expression, synthesis, and structure of human Ia antigens, specifically HLA-DR.
    • To analyze the molecular composition and polymorphism of HLA-DR antigens using advanced techniques like two-dimensional gel electrophoresis.
    • To elucidate the structural basis of HLA-DR polymorphism and its relationship with serologically defined determinants.

    Summary:

    • HLA-DR antigens are composed of alpha (34,000 daltons) and beta (29,000 daltons) subunits, with glycosylation and sialic acid addition during maturation.
    • Structural polymorphism, primarily located on the beta chain, correlates with serologically defined HLA-DR determinants and is of polypeptidic origin.
    • A third component, the 31,000-dalton invariant chain, is also described, with its peptide composition, glycosylation, and expression detailed.

    Impact:

    • Structural studies of HLA-DR antigens provide insights into the functional roles of different molecular epitopes.
    • Understanding HLA-DR structure aids in dissecting immune response mechanisms and potential therapeutic targets.
    • Homologies between human HLA-DR and mouse Ia antigens facilitate comparative immunogenetic research.

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