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Natural killer function in B-chronic lymphocytic leukemia.

N E Kay1, R T Perri

  • 1Section of Hematology/Oncology, Minneapolis Veterans Administration Medical Center, MN 55417.

Nouvelle Revue Francaise D'Hematologie
|January 1, 1988
PubMed
Summary
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Large granular lymphocytes (LGL) from B-cell chronic lymphocytic leukemia (B-CLL) patients with hypogammaglobulinemia suppress normal B cell immunoglobulin synthesis. LGL from B-CLL patients without hypogammaglobulinemia do not exhibit this suppressive effect.

Area of Science:

  • Immunology
  • Hematology
  • Cell Biology

Background:

  • Large granular lymphocytes (LGL) are implicated in immune regulation, with previous studies suggesting a suppressive role in B cell function.
  • B-cell chronic lymphocytic leukemia (B-CLL) is often associated with hypogammaglobulinemia, indicating impaired B cell immunity.
  • Understanding the interaction between LGL and B cells in B-CLL is crucial for elucidating disease pathogenesis and potential therapeutic targets.

Purpose of the Study:

  • To investigate the impact of blood LGL from B-CLL patients, with and without hypogammaglobulinemia, on normal B cell immunoglobulin (Ig) synthesis and proliferation.
  • To identify specific LGL subsets responsible for immune suppression in B-CLL patients.

Main Methods:

  • Co-culture of purified blood LGL from age- and sex-matched controls and B-CLL patients with isolated normal B cells.

Related Experiment Videos

  • Stimulation of B cells with mitogens (PWM, anti-Ig/SPA) and assessment of Ig levels (ELISA) and proliferation (thymidine incorporation).
  • Purification of LGL subsets (CD16+, CD3- and CD16+, CD3+) using flow cytometry for functional assays.

    • Main Results:

    • LGL from B-CLL patients with hypogammaglobulinemia significantly suppressed normal B cell Ig synthesis and secretion.
    • LGL from B-CLL patients with normal serum Ig levels did not demonstrate significant suppressive effects on B cell function.
    • The CD16+, CD3- LGL subset from hypogammaglobulinemic B-CLL patients was identified as a key suppressive population.

    Conclusions:

    • Blood LGL, particularly the CD16+, CD3- subset, from B-CLL patients with hypogammaglobulinemia exhibit potent suppressive activity against normal B cell immunoglobulin production.
    • The absence of this suppressive effect in B-CLL patients with normal Ig levels suggests a correlation between hypogammaglobulinemia and LGL-mediated B cell suppression.
    • These findings highlight a potential mechanism contributing to immune deficiency in B-CLL and suggest LGL as a target for therapeutic intervention.