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B- and T-cell-specific alloantigens in man

E D Albert, A Andreas, A McNicholas

    Scandinavian Journal of Immunology
    |January 1, 1977
    PubMed
    Summary

    Researchers identified B-cell-specific antibodies in pregnancy sera, finding they often show cross-reactivity similar to HLA-A and -B antigens. This suggests human Ia antigens may include both B-cell and T-cell specific alloantigens.

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    Area of Science:

    • Immunology
    • Serology
    • Human Leukocyte Antigens (HLA)

    Background:

    • Pregnancy sera screening is crucial for detecting alloantibodies.
    • Human Leukocyte Antigens (HLA) play a vital role in immune responses and transplantation.
    • Previous studies focused on HLA-A, -B, and -C antigens, with less known about B-cell specificities.

    Purpose of the Study:

    • To screen for and characterize B-cell-specific antibodies in pregnancy sera.
    • To investigate the cross-reactivity patterns of these B-cell antibodies.
    • To explore the potential existence of human equivalents to murine Ia antigens, including B-cell and T-cell specific alloantigens.

    Main Methods:

    • Screening of unabsorbed pregnancy sera for B-cell-specific antibodies.
    • Utilizing sera preselected for weak reactivity in standard HLA-A, -B, and -C screening.
    • Control experiments using T-cell-enriched cell suspensions.
    • Analysis of antibody association with HLA-A2, HLA haplotypes, and HLA recombination events.

    Main Results:

    • A significant proportion (35/81) of B-cell-specific antibodies were identified.
    • Most B-cell-specific antibodies exhibited broad reactivity with inclusion phenomena, suggesting cross-reactivity.
    • Three antisera reacted specifically with T cells, not B cells, and were associated with HLA-A2 and specific HLA haplotypes.

    Conclusions:

    • The findings suggest that human Ia antigens may encompass both B-cell and T-cell specific alloantigens.
    • B-cell specificities in humans share cross-reactivity patterns analogous to those seen in HLA-A and -B serology.
    • Further research into human Ia antigens is warranted, drawing parallels with murine Ia antigen systems.

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