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A human leukemia cell with both B and T cell surface receptors
Summary
Human leukemia cells were found to possess unusual immunological properties, simultaneously exhibiting markers of both T lymphocytes and B lymphocytes. This finding also identified a small subset of normal lymphocytes with dual receptor expression.
Area of Science:
- Immunology
- Hematology
- Cell Biology
Background:
- Lymphocytes, including bone-marrow-derived (B) and thymus-derived (T) cells, are typically distinguished by specific receptors and differentiation antigens.
- These markers are crucial for identifying and characterizing mononuclear cells in lymphoid malignancies.
Purpose of the Study:
- To describe the unique immunological properties of human leukemia cells.
- To investigate the co-expression of B lymphocyte and T lymphocyte receptors on leukemia cells.
Main Methods:
- Immunological characterization of human leukemia cells.
- Identification and analysis of cell surface receptors using sheep erythrocyte rosettes and antigen-antibody-complement complex binding.
Main Results:
- Human leukemia cells were identified that simultaneously express the sheep erythrocyte receptor (T lymphocyte marker) and the antigen-antibody-complement receptor (B lymphocyte marker).
- A small population (approximately 2%) of normal human lymphocytes also demonstrated co-expression of both receptor types.
Conclusions:
- The study describes a rare subset of human leukemia cells with dual B and T lymphocyte characteristics.
- The identification of normal lymphocytes with similar dual receptor expression suggests a potential precursor or transitional cell population.