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Immune cell populations in cutaneous delayed-type hypersensitivity.

J L Platt, B W Grant, A A Eddy

    The Journal of Experimental Medicine
    |October 1, 1983
    PubMed
    Summary
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    Delayed-type hypersensitivity (DTH) involves T lymphocyte responses. This study found early accumulation of OKT4 T cells and later signs of T cell activation in skin during tuberculin reactions in sensitized individuals.

    Area of Science:

    • Immunology
    • Cellular immunology

    Background:

    • Delayed-type hypersensitivity (DTH) is a key T lymphocyte-mediated immune response.
    • Understanding the cellular dynamics of DTH is crucial for immune response research.

    Purpose of the Study:

    • To identify and characterize mononuclear cells infiltrating the skin during a DTH response to tuberculin.
    • To investigate the temporal changes and activation status of T lymphocytes within the cutaneous infiltrate.

    Main Methods:

    • Mononuclear cells from human skin biopsies during tuberculin-induced DTH were analyzed using indirect immunofluorescence with monoclonal antibodies.
    • Key cell populations, including T lymphocytes (T11+, OKT3+, OKT4+, OKT8+), monocytes (OKM1+, 63D3+, Mo2+), and activation markers (anti-Tac, OKT9, OKT10), were identified.
    • Cellular ratios and distributions were compared between responders and controls at different time points.

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    Main Results:

    • The infiltrate primarily comprised T lymphocytes and monocytes, accumulating near blood vessels and then infiltrating dermal and epidermal layers.
    • An early enrichment of OKT4+ T lymphocytes relative to OKT8+ T lymphocytes was observed in the tissue of responders compared to blood.
    • Evidence of T lymphocyte activation, indicated by increased reactivity to anti-Tac, OKT9, and OKT10 antibodies, was detected in the tissue infiltrates of responders between 15-48 hours post-challenge.

    Conclusions:

    • The DTH response to tuberculin in sensitized individuals is characterized by an early influx of OKT4+ T lymphocytes.
    • Subsequent T lymphocyte activation occurs within the skin tissue, distinct from peripheral blood changes.
    • These findings elucidate the cellular mechanisms underlying DTH skin reactions.