|
||
/
1 T Cell Receptor
/ß1 Intestinal Intraepithelial Lymphocytes in the Absence of Both Classical Major Histocompatibility Complex Class I and Nonclassical CD1 Molecules
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-
/ß1 cells which differ functionally and ontogenically from each other. One expresses the CD8
/
homodimer, whereas the other expresses the CD8
/ß heterodimer. Although the presence of all CD8+TCR-
/ß1 IELs is dependent on ß2-microglobulin molecules, the nature of the major histocompatibility complex (MHC) class I molecules recognized by the CD8
/
and the CD8
/ß1 subsets has remained elusive. Using mutant mice lacking the expression of both H2-Kb and H2-Db, we show that the CD8
/ß1TCR-
/ß1 subset is dependent on K or D molecules, whereas the CD8
/
1TCR-
/ß1 subset is independent of classical MHC class I molecules. Furthermore, the CD8
/
1 cells are conserved in mice lacking expression of CD1, a nonclassical MHC class Ilike 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
/ß1TCR-
/ß1 IELs are restricted by H-2K and H-2D molecules, whereas the unusual subset of CD8
/
1TCR-
/ß1 resident IELs recognize nonclassical MHC class Ilike molecules that are distinct from CD1.
Key Words: major histocompatibility complex, CD1, intestinal intraepithelial lymphocytes, CD8, gene-targeted mouse
This article has been cited by other articles:
| TABLE OF CONTENTS |
|