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Lymphocyte surface IgD and IgM in non-human primates

L N Martin, G A Leslie, R Hindes

    International Archives of Allergy and Applied Immunology
    |January 1, 1976
    PubMed
    Summary

    Immunoglobulin D (IgD) was found on the surface of lymphocytes in five non-human primate species. This finding suggests a conserved role for IgD in primate immune systems, similar to humans.

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    Area of Science:

    • Immunology
    • Primate immunology

    Background:

    • Immunoglobulin D (IgD) is a key B cell surface receptor, but its precise function and evolutionary conservation across species remain areas of active research.
    • Previous studies have primarily focused on IgD expression in humans and a few model organisms.

    Purpose of the Study:

    • To investigate the presence and characteristics of surface-bound Immunoglobulin D (IgD) on lymphocytes in various non-human primate species.
    • To compare IgD expression levels in non-human primates with those reported in humans.

    Main Methods:

    • Direct immunofluorescence was employed to detect surface IgD and IgM on peripheral blood lymphocytes from five non-human primate species.
    • For rhesus monkey lymphocytes, surface proteins were immunoprecipitated, labeled with 125I, and analyzed using SDS-polyacrylamide gel electrophoresis to confirm IgD presence and structure.

    Main Results:

    • Surface IgD was successfully detected on lymphocytes across all five non-human primate species studied.
    • The percentages of lymphocytes expressing surface IgD or IgM were found to be comparable to human levels.
    • SDS-PAGE analysis confirmed the presence of IgD on rhesus monkey lymphocytes, resolving into distinct light and heavy chain components.

    Conclusions:

    • The findings demonstrate the presence of surface IgD on lymphocytes in multiple non-human primate species, indicating evolutionary conservation.
    • The comparable expression levels to humans suggest a potentially similar functional role for IgD in primate B cell regulation and immunity.
    • Further research into the specific functions of IgD in non-human primates could provide valuable insights into B cell development and immune responses across primates.

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