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Extensive replicative capacity of human central memory T cells.
Marcela V Maus1, Birgit Kovacs, William W Kwok
1Abramson Family Cancer Research Institute, University of Pennsylvania Cancer Center,University of Pennsylvania, Philadelphia, PA 19104, USA.
Journal of Immunology (Baltimore, Md. : 1950)
|May 22, 2004
Summary
Researchers developed a new method using artificial antigen-presenting cells (aAPCs) to expand central memory (T(CM)) CD4 T cells. This technique shows promise for adoptive immunotherapy and studying T cell biology.
Area of Science:
- Immunology
- Cell Biology
- Biotechnology
Background:
- Central memory (T(CM)) CD4 T cells are crucial for adaptive immunity.
- Efficient ex vivo expansion of Ag-specific T(CM) CD4 T cells is needed for immunotherapy and research.
Purpose of the Study:
- To characterize the replicative capacity of human T(CM) CD4 T cells.
- To develop a defined culture system for ex vivo expansion of Ag-specific CD4 T cells.
Main Methods:
- Developed artificial antigen-presenting cells (aAPCs) using magnetic beads coated with HLA class II and CD28 antibodies.
- Loaded aAPCs with peptide-charged HLA class II tetramers for Ag specificity.
- Isolated influenza-specific DR*0401 CD4 T(CM) from peripheral blood using flow cytometry.
Main Results:
- aAPCs efficiently promoted the growth of previously activated CD4 T(CM) cells, achieving >80% Ag-specific cells after two stimulations.
- Further stimulation increased purity to >99% Ag-specific T cells.
- Expanded T(CM) CD4 T cells exhibited an effector phenotype, maintained CD28 expression, and underwent 20-40 mean population doublings, producing key cytokines (IFN-gamma, IL-2, TNF-alpha, IL-4).
Conclusions:
- Artificial antigen-presenting cells (aAPCs) effectively expand human T(CM) CD4 T cells with extensive replicative capacity.
- This method has potential applications in adoptive immunotherapy.
- The system is valuable for studying the biology of human MHC class II-restricted T cells.