NDLI: 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

Content Provider	PubMed Central
Author	Park, Se-ho Guy-grand, Delphine Lemonnier, François A. Wang, Chyung-ru Albert, Bendelac Jabri, Bana
Copyright Year	1999
Abstract	Intestinal intraepithelial lymphocytes (IELs) in mice include two main subsets of TCR-α/β1 cells which differ functionally and ontogenically from each other. One expresses the CD8α/α homodimer, whereas the other expresses the CD8α/β heterodimer. Although the presence of all CD8+TCR-α/β1 IELs is dependent on β2-microglobulin molecules, the nature of the major histocompatibility complex (MHC) class I molecules recognized by the CD8α/α and the CD8α/β1 subsets has remained elusive. Using mutant mice lacking the expression of both H2-Kb and H2-Db, we show that the CD8α/β1TCR-α/β1 subset is dependent on K or D molecules, whereas the CD8α/α1TCR-α/β1 subset is independent of classical MHC class I molecules. Furthermore, the CD8α/α1 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 CD8α/β1TCR-α/β1 IELs are restricted by H-2K and H-2D molecules, whereas the unusual subset of CD8α/α1TCR-α/β1 resident IELs recognize nonclassical MHC class I–like molecules that are distinct from CD1.
Starting Page	885
File Format	PDF
ISSN	15409538
e-ISSN	15409538
Journal	The Journal of Experimental Medicine
Issue Number	6
Volume Number	190
Language	English
Publisher	The Rockefeller University Press
Publisher Date	1999-09-20
Access Restriction	Open
Rights Holder	The Rockefeller University Press
Subject Keyword	Research in Higher Education
Content Type	Text
Resource Type	Article
Subject	Immunology and Allergy Immunology

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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

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