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. 1995 Dec 1;182(6):2091–2096. doi: 10.1084/jem.182.6.2091

Positive selection of mouse NK1+ T cells by CD1-expressing cortical thymocytes

PMCID: PMC2192225  PMID: 7500054

Abstract

Mouse NK1+ T cells constitute a subset of alpha/beta TCR+ T cells that specialize in the rapid production of cytokines, in particular IL-4, and may promote the differentiation of Th2-type CD4 T cells. Their TCRs, like those of a homologous subset of human T cells, use an invariant TCR alpha chain and were recently shown to be specific for the beta 2-microglobulin-associated, MHC class I-like CD1 molecules, which are encoded outside the MHC. In contrast to mainstream thymocytes, which recognize their positively selecting MHC ligand on thymic epithelial cells, positive selection of NK1+ T cells requires their CD1 ligand to be expressed on bone marrow-derived cells. To investigate the nature of the bone marrow-derived cell involved, chimeric mice were constructed with tissues from normal, SCID, and MHC- deficient mice, so that CD1 could be selectively expressed by different subsets of bone marrow-derived cells in the thymus. CD1 expression was also directly assessed using an anti-CD1 mAb, and a CD1-specific T cell hybridoma. The results suggest that immature (CD4+8+ double-positive) cortical thymocytes are the source of CD1 presentation for positive selection of NK1+ T cells.

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Selected References

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