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Long-lived lymphocytes include lipopolysaccharide-reactive B cells.

M Levy

    Cellular Immunology
    |December 1, 1985
    PubMed
    Summary

    A new hydroxyurea (HU) treatment protocol effectively isolates long-lived B and T cells. These cells retain their functional capabilities, enabling detailed studies of lymphocyte populations and their immune responses.

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    Area of Science:

    • Immunology
    • Cell Biology

    Background:

    • Studying long-lived lymphocyte populations is crucial for understanding adaptive immunity.
    • Existing methods often fail to isolate specific lymphocyte subsets for functional analysis.

    Purpose of the Study:

    • To develop and validate a novel protocol for isolating long-lived B and T lymphocytes.
    • To assess the functional capacity of these isolated lymphocyte populations.
    • To enable future studies on lymphocyte clonal repertoires and immune responses.

    Main Methods:

    • Prolonged in vivo hydroxyurea (HU) administration to eliminate cycling and short-lived cells.
    • Analysis of lymphocyte populations (B and T cells) in spleen, bone marrow, and blood.
    • Assessment of mitogen-induced proliferation and differentiation of isolated lymphocytes.

    Main Results:

    • The HU protocol successfully depleted 99% of non-B, non-T bone marrow cells, preserving long-lived B and T cells.
    • While spleen and blood lymphocyte proportions remained stable, bone marrow showed altered B and T cell ratios due to increased permeability.
    • Isolated long-lived B cells responded robustly to lipopolysaccharide, and T cells showed near-control proliferation to concanavalin A.

    Conclusions:

    • Long-term hydroxyurea treatment provides a viable method for isolating functional long-lived B and T lymphocytes.
    • This protocol facilitates the study of specific lymphocyte populations, their clonal diversity, and immune functions.
    • The findings open new avenues for investigating the adaptive immune system and its components.

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