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© The Rockefeller University Press, 0022-1007/1999/9/885/ $5.00
The Journal of Experimental Medicine, Volume 190, Number 6, September 20, 1999 885-890

Selection and Expansion of CD8{alpha}/{alpha}1 T Cell Receptor {alpha}1 Intestinal Intraepithelial Lymphocytes in the Absence of Both Classical Major Histocompatibility Complex Class I and Nonclassical CD1 Molecules

Se-Ho Parka, Delphine Guy-Grandb, François A. Lemonnierc, Chyung-Ru Wangd, Albert Bendelaca, and Bana Jabria
a Department of Molecular Biology, Princeton University, Princeton, New Jersey 08544
b Hôpital Necker Enfants Malades, INSERM U429, 75015 Paris, France
c Institut Pasteur, Unité d'Immunité Cellulaire Antivirale, 75015 Paris, France
d Department of Pathology, Gwenn Knapp Center for Lupus and Immunological Research, University of Chicago, Chicago, Illinois 60637

Correspondence to: Bana Jabri, Department of Molecular Biology, Princeton University, Princeton, NJ 08544. Tel:609-258-5351 Fax:609-258-2205 E-mail:bjabri{at}molbio.princeton.edu.

Intestinal intraepithelial lymphocytes (IELs) in mice include two main subsets of TCR-{alpha}1 cells which differ functionally and ontogenically from each other. One expresses the CD8{alpha}/{alpha} homodimer, whereas the other expresses the CD8{alpha}/ß heterodimer. Although the presence of all CD8+TCR-{alpha}1 IELs is dependent on ß2-microglobulin molecules, the nature of the major histocompatibility complex (MHC) class I molecules recognized by the CD8{alpha}/{alpha} and the CD8{alpha}1 subsets has remained elusive. Using mutant mice lacking the expression of both H2-Kb and H2-Db, we show that the CD8{alpha}1TCR-{alpha}1 subset is dependent on K or D molecules, whereas the CD8{alpha}/{alpha}1TCR-{alpha}1 subset is independent of classical MHC class I molecules. Furthermore, the CD8{alpha}/{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 CD8{alpha}1TCR-{alpha}1 IELs are restricted by H-2K and H-2D molecules, whereas the unusual subset of CD8{alpha}/{alpha}1TCR-{alpha}1 resident IELs recognize nonclassical MHC class I–like molecules that are distinct from CD1.

Key Words: major histocompatibility complex, CD1, intestinal intraepithelial lymphocytes, CD8, gene-targeted mouse


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