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Human CD3+ T lymphocytes that express neither CD4 nor CD8 antigens
The Journal of Experimental Medicine
|July 1, 1986
Summary
Uncommon CD3+ T cells lacking CD4 and CD8 markers were identified in human blood. These cells, when cultured, developed into cytotoxic T lymphocytes capable of targeting tumor cells without MHC restriction.
Area of Science:
- Immunology
- Cell Biology
Background:
- Human peripheral blood contains a small population of T lymphocytes defined by the CD3+CD4-CD8- phenotype.
- These T cells represent approximately 3% of total lymphocytes.
Purpose of the Study:
- To investigate the characteristics and functional potential of CD3+CD4-CD8- T lymphocytes.
- To determine if these cells can be expanded and differentiated into effector cells.
Main Methods:
- Isolation and in vitro culture of CD3+CD4-CD8- T cells from human peripheral blood.
- Culture was performed in the presence of recombinant interleukin-2 (rIL-2).
- Functional assays were conducted to assess cytotoxic activity against tumor cell lines.
Main Results:
- The CD3+CD4-CD8- phenotype remained stable during in vitro culture with IL-2.
- Culture in rIL-2 induced the generation of cytotoxic T lymphocytes from these cells.
- The generated cytotoxic T lymphocytes effectively lysed both NK-sensitive and NK-insensitive tumor cell targets.
- Cytotoxicity was observed without the need for MHC restriction.
Conclusions:
- Phenotypically and functionally competent T cells lacking CD4 and CD8 expression are present in normal human peripheral blood.
- These CD3+CD4-CD8- T cells possess the capacity to develop into MHC-non-restricted cytotoxic T lymphocytes.
- This finding expands our understanding of T cell subsets and their potential roles in immune responses.