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Related Experiment Videos

Human lymphocyte sub-populations and K cells

G Sandilands, K Gray, A Cooney

    International Archives of Allergy and Applied Immunology
    |January 1, 1976
    PubMed
    Summary
    This summary is machine-generated.

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    Researchers identified a distinct lymphocyte population lacking surface immunoglobulin (SIg) but possessing Fc receptors. These cells correlate with antibody-dependent cytotoxic activity, suggesting their role in cell-mediated immunity.

    Area of Science:

    • Immunology
    • Cell Biology

    Background:

    • Peripheral blood lymphocytes play crucial roles in immune responses.
    • Characterizing lymphocyte subsets is essential for understanding immune function.

    Purpose of the Study:

    • To investigate the relationship between surface immunoglobulin (SIg) expression and rosette formation capacity in human lymphocytes.
    • To identify and characterize lymphocyte populations involved in antibody-dependent cellular cytotoxicity (ADCC).

    Main Methods:

    • Analysis of surface markers on peripheral blood lymphocytes using rosette formation assays with various erythrocytes.
    • Combined testing and depletion experiments to correlate SIg presence with Fc receptor function.
    • Assessment of cytotoxic activity against antibody-sensitized target cells.

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    Main Results:

    • A distinct lymphocyte population lacking SIg but expressing Fc receptors was identified (mean 14.6%).
    • This SIg-negative, Fc receptor-positive lymphocyte subset showed a strong correlation with cytotoxic activity.
    • Indirect evidence suggests these cells are capable of forming rosettes with sheep erythrocytes.

    Conclusions:

    • A specific subset of lymphocytes, characterized by Fc receptors and absence of SIg, is identified as a major population of antibody-dependent cytotoxic cells.
    • These findings contribute to the understanding of cellular immunity and lymphocyte subset heterogeneity.