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Leukemic CD3+ LGL share functional properties with their CD8+ CD57+ cell counterpart expanded after BMT
L Mollet1, B Fautrel, V Leblond
1Laboratoire d'Immunologie Cellulaire et Tissulaire, CNRS-UMR 7627, Hôpital Pitié-Salpétriêre, Paris, France.
Leukemia
|February 20, 1999
Summary
Leukemic large granular lymphocyte (LGL) cells share cytotoxic effector and immunoregulatory functions with normal T cells found after bone marrow transplantation (BMT). These findings highlight potential therapeutic targets in T-LGL leukemia.
Area of Science:
- Immunology
- Hematology
- Cell Biology
Background:
- Large granular lymphocyte (LGL) leukemia involves clonal expansion of CD8+ T cells.
- Bone marrow transplantation (BMT) can lead to oligoclonal expansion of CD8+ T cells.
- Understanding the functional similarities and differences between leukemic and non-leukemic CD8+ T cells is crucial for T-LGL leukemia research.
Purpose of the Study:
- To compare the phenotypic and functional characteristics of leukemic T-LGL cells with CD8+ T cells expanded after BMT.
- To investigate the cytotoxic potential and immunoregulatory functions of these cell populations.
Main Methods:
- Flow cytometry was used to analyze cell surface markers (CD3, TCR, CD8, CD57, CD16, adhesion molecules, activation markers, CD45RA).
- Ex vivo cytotoxicity assays were performed to assess CD3-redirected and NK cell activity.
- Cell cultures with different stimuli (PHA, PMA, rhIL-2) were used to evaluate cell persistence and functional changes.
Main Results:
- Leukemic CD8+ CD57+ LGL cells exhibited distinct phenotypic profiles compared to BMT-derived CD8+ T cells, including upregulated CD16 and adhesion molecules.
- Both leukemic and BMT-derived CD8+ CD57+ T cells demonstrated spontaneous ex vivo CTL-like cytotoxicity but lacked NK cell activity.
- Stimulation induced similar cytotoxic profiles, with CD3-redirected lysis dominating over NK activity. Leukemic LGL showed variable persistence depending on the stimulus.
- Leukemic T-LGL produced an inhibitor of cytotoxic functions, similar to BMT recipients' cells.
Conclusions:
- Despite some phenotypic differences, leukemic CD57+ T-LGL share functional characteristics of cytotoxic effector and immunoregulatory T cells with CD8+ CD57+ T cells from BMT recipients.
- These findings suggest that CD8+ CD57+ T cells from BMT recipients may represent the normal counterpart of leukemic T-LGL.
- The study provides insights into the functional biology of T-LGL leukemia and its relationship to normal T cell responses.