alexa NKG2D is a costimulatory receptor for human naive CD8+ T cells.
Immunology

Immunology

Immunome Research

Author(s): Maasho K, OpokuAnane J, Marusina AI, Coligan JE, Borrego F, Maasho K, OpokuAnane J, Marusina AI, Coligan JE, Borrego F

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Abstract In humans, all alpha beta CD8+ T cells express NKG2D, but in mouse, it is only expressed by activated and memory CD8+ T cells. We purified human naive CD8+ T cells to show that NKG2D serves as a costimulatory receptor for TCR induced Ca2+ mobilization and proliferation. The resulting effector cells are skewed toward a type 1 phenotype and produce high levels of IFN-gamma and TNF-alpha. NKG2D ligands, MHC class I chain-related (MIC)A, MICB, and UL16-binding proteins are expressed on the proliferating cells and NKG2D is down-regulated. The addition of the homeostatic cytokines IL-7 and IL-15 to the culture medium not only enhances proliferation but also counteracts the down-regulation of NKG2D, more so than the addition of IL-2. These results indicate that NKG2D can regulate the priming of human naive CD8+ T cells, which may provide an alternative mechanism for potentiating and channeling the immune response.
This article was published in J Immunol and referenced in Immunome Research

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