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CD1 expression in B-CLL cells.

H Merle-Béral1, L Boumsell, A Michel

  • 1Département d'Hématologie, Hôpital Pitié-Salpêtrière, Paris, France.

Nouvelle Revue Francaise D'Hematologie
|January 1, 1988
PubMed
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Flow cytometry revealed diverse cell surface markers on chronic lymphocytic leukemia (CLL) cells. Some B-cell and T-cell markers were unexpectedly found on these leukemic B cells.

Area of Science:

  • Immunology
  • Hematology
  • Oncology

Background:

  • Chronic lymphocytic leukemia (CLL) is a B-cell malignancy.
  • Understanding the cell surface phenotype of CLL cells is crucial for diagnosis and treatment.
  • Previous studies have characterized some CLL cell surface markers, but heterogeneity exists.

Purpose of the Study:

  • To comprehensively characterize the cell surface phenotype of lymphoid cells in B-cell chronic lymphocytic leukemia (B-CLL) patients.
  • To investigate the expression of B-cell, T-cell, and MHC class II antigens on leukemic B cells.
  • To identify potential aberrant antigen expression that could inform diagnostic or therapeutic strategies.

Main Methods:

  • Peripheral blood samples from 38 B-CLL patients were analyzed using flow cytometry.

Related Experiment Videos

  • A panel of 25 clustered and non-clustered monoclonal antibodies (moAbs) targeting B-cell, T-cell (CD1-8), and MHC class II antigens was employed.
  • Further detailed analysis with specific CD1a, CD1b, and CD1c moAbs was performed on 6 selected cases.

    • Main Results:

    • Significant heterogeneity in leukemic cell reactivity to various moAbs was observed among patients.
    • Restricted B-cell antigens (BL14, Y2955) and anti-class II moAbs were consistently expressed.
    • Variable expression of B-cell antigens (FMC7, BL13) was noted.
    • Co-expression of CD5 and other T-cell markers, including CD1 epitopes, was detected on leukemic B cells in several cases.
    • Specific CD1a and CD1c epitopes were found on leukemic B cells, alongside other T-cell differentiation antigens.

    Conclusions:

    • Leukemic B cells in B-CLL exhibit a heterogeneous cell surface phenotype.
    • The presence of T-cell markers, particularly CD1a and CD1c epitopes, on leukemic B cells suggests potential aberrant antigen expression.
    • These findings contribute to a deeper understanding of CLL immunophenotyping and may have implications for disease classification and targeted therapies.