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Related Experiment Videos

Human MHC class II molecules as differentiation markers

V van Heyningen, K Guy, R Newman

    Immunogenetics
    |January 1, 1982
    PubMed
    Summary
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    Two mouse monoclonal antibodies, DA6.231 and DA6.164, identify distinct epitopes on HLA-DR glycoproteins. The DA6.231 epitope is broadly expressed, while DA6.164 is restricted, suggesting differential expression of class II molecules.

    Area of Science:

    • Immunology
    • Molecular Biology
    • Cell Biology

    Background:

    • Human Leukocyte Antigen (HLA) class II molecules, particularly HLA-DR, play a crucial role in immune responses.
    • Understanding the expression and polymorphism of HLA-DR epitopes is vital for immunology and transplantation.
    • Monoclonal antibodies are key tools for characterizing cell surface antigens like HLA-DR.

    Purpose of the Study:

    • To characterize two novel mouse monoclonal antibodies, DA6.231 and DA6.164, targeting HLA-DR-like glycoproteins.
    • To investigate the distribution and co-expression patterns of the epitopes recognized by these antibodies on various cell types.
    • To determine if these epitopes represent polymorphic or nonpolymorphic determinants and their potential as markers for differential expression.

    Main Methods:

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    • Immunoprecipitation of HLA-DR-like p34,29 glycoprotein dimers from labeled cells using DA6.231 and DA6.164 antibodies.
    • Analysis of epitope distribution on lymphoblastoid cell lines and leukemia patient cells.
    • Binding-inhibition studies to assess spatial proximity and mutual exclusivity of epitopes.
    • Immune depletion studies to quantify the ratio of cells expressing different epitope combinations.

    Main Results:

    • DA6.231 and DA6.164 antibodies successfully immunoprecipitated HLA-DR-like glycoprotein dimers.
    • The DA6.231 epitope showed nonpolymorphic distribution, while the DA6.164 epitope was absent on DR7 homozygous cells.
    • Binding inhibition indicated spatial proximity of the 231 and 164 epitopes, but they were not always co-expressed.
    • Most DR-positive cells displayed a 2:1 ratio of cells with both epitopes (231+ 164+) versus cells with only the 231 epitope (231+ 164-).

    Conclusions:

    • DA6.231 defines a broadly distributed, likely nonpolymorphic epitope on HLA-DR molecules, potentially a supralocus epitope.
    • The DA6.164 epitope may serve as a marker for a subset of HLA class II molecules with differential expression patterns.
    • These findings contribute to understanding HLA-DR heterogeneity and its implications in various cell types, including malignant transformations.