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Ex Vivo Expansion of Human CD8(+) T Cells Using Autologous CD4(+) T Cell Help
BACKGROUND: Using in vivo mouse models, the mechanisms of CD4(+) T cell help have been intensively investigated. However, a mechanistic analysis of human CD4(+) T cell help is largely lacking. Our goal was to elucidate the mechanisms of human CD4(+) T cell help of CD8(+) T cell proliferation using a...
Autores principales: | , , , , , , , , , , , , |
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Formato: | Online Artículo Texto |
Lenguaje: | English |
Publicado: |
Public Library of Science
2012
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Materias: | |
Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3257268/ https://www.ncbi.nlm.nih.gov/pubmed/22279573 http://dx.doi.org/10.1371/journal.pone.0030229 |
Sumario: | BACKGROUND: Using in vivo mouse models, the mechanisms of CD4(+) T cell help have been intensively investigated. However, a mechanistic analysis of human CD4(+) T cell help is largely lacking. Our goal was to elucidate the mechanisms of human CD4(+) T cell help of CD8(+) T cell proliferation using a novel in vitro model. METHODS/PRINCIPAL FINDINGS: We developed a genetically engineered novel human cell-based artificial APC, aAPC/mOKT3, which expresses a membranous form of the anti-CD3 monoclonal antibody OKT3 as well as other immune accessory molecules. Without requiring the addition of allogeneic feeder cells, aAPC/mOKT3 enabled the expansion of both peripheral and tumor-infiltrating T cells, regardless of HLA-restriction. Stimulation with aAPC/mOKT3 did not expand Foxp3(+) regulatory T cells, and expanded tumor infiltrating lymphocytes predominantly secreted Th1-type cytokines, interferon-γ and IL-2. In this aAPC-based system, the presence of autologous CD4(+) T cells was associated with significantly improved CD8(+) T cell expansion in vitro. The CD4(+) T cell derived cytokines IL-2 and IL-21 were necessary but not sufficient for this effect. However, CD4(+) T cell help of CD8(+) T cell proliferation was partially recapitulated by both adding IL-2/IL-21 and by upregulation of IL-21 receptor on CD8(+) T cells. CONCLUSIONS: We have developed an in vitro model that advances our understanding of the immunobiology of human CD4(+) T cell help of CD8(+) T cells. Our data suggests that human CD4(+) T cell help can be leveraged to expand CD8(+) T cells in vitro. |
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