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- W2045300635 abstract "Intestinal intraepithelial lymphocytes (IELs) in mice include two main subsets of TCR-alpha/beta(1) cells which differ functionally and ontogenically from each other. One expresses the CD8alpha/alpha homodimer, whereas the other expresses the CD8alpha/beta heterodimer. Although the presence of all CD8(+)TCR-alpha/beta(1) IELs is dependent on beta2-microglobulin molecules, the nature of the major histocompatibility complex (MHC) class I molecules recognized by the CD8alpha/alpha and the CD8alpha/beta(1) subsets has remained elusive. Using mutant mice lacking the expression of both H2-K(b) and H2-D(b), we show that the CD8alpha/beta(1)TCR-alpha/beta(1) subset is dependent on K or D molecules, whereas the CD8alpha/alpha(1)TCR-alpha/beta(1) subset is independent of classical MHC class I molecules. Furthermore, the CD8alpha/alpha(1) cells are conserved in mice lacking expression of CD1, a nonclassical MHC class I-like molecule previously proposed to be a potential ligand for IELs. Using transporter associated with antigen processing (TAP)-deficient mice, this cell population can be further separated into a TAP-dependent and a TAP-independent subset, suggesting either the recognition of two nonclassical MHC-like molecules, only one of which is TAP dependent, or the involvement of a single nonclassical MHC-like molecule that is only partially TAP dependent. These findings demonstrate that CD8alpha/beta(1)TCR-alpha/beta(1) IELs are restricted by H-2K and H-2D molecules, whereas the unusual subset of CD8alpha/alpha(1)TCR-alpha/beta(1) resident IELs recognize nonclassical MHC class I-like molecules that are distinct from CD1." @default.
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- W2045300635 date "1999-09-20" @default.
- W2045300635 modified "2023-10-18" @default.
- W2045300635 title "Selection and Expansion of CD8α/α1 T Cell Receptor α/β1 Intestinal Intraepithelial Lymphocytes in the Absence of Both Classical Major Histocompatibility Complex Class I and Nonclassical Cd1 Molecules" @default.
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- W2045300635 doi "https://doi.org/10.1084/jem.190.6.885" @default.
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