Early recycling compartment trafficking of CD1a is essential for its intersection and presentation of lipid antigens

Cernadas, Manuela and Cavallari, Marco and Watts, Gerald and Mori, Lucia and De Libero, Gennaro and Brenner, Michael B.. (2010) Early recycling compartment trafficking of CD1a is essential for its intersection and presentation of lipid antigens. Journal of immunology, Vol. 184, H. 3. pp. 1235-1241.

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Official URL: http://edoc.unibas.ch/dok/A6003715

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A major step in understanding differences in the nature of Ag presentation was the realization that MHC class I samples peptides transported to the endoplasmic reticulum from the cytosol, whereas MHC class II samples peptides from lysosomes. In contrast to MHC class I and II molecules that present protein Ags, CD1 molecules present lipid Ags for recognition by specific T cells. Each of the five members of the CD1 family (CD1a-e) localizes to a distinct subcompartment of endosomes. Accordingly, it has been widely assumed that the distinct trafficking of CD1 isoforms must also have evolved to enable them to sample lipid Ags that traffic via different routes. Among the CD1 isoforms, CD1a is unusual because it does not have a tyrosine-based cytoplasmic sorting motif and uniquely localizes to the early endocytic recycling compartment. This led us to predict that CD1a might have evolved to focus on lipids that localize to early endocytic/recycling compartments. Strikingly, we found that the glycolipid Ag sulfatide also localized almost exclusively to early endocytic and recycling compartments. Consistent with colocalization of CD1a and sulfatide, wild-type CD1a molecules efficiently presented sulfatide to CD1a-restricted, sulfatide-specific T cells. In contrast, CD1a:CD1b tail chimeras, that retain the same Ag-binding capacity as CD1a but traffic based on the cytoplasmic tail of CD1b to lysosomes, failed to present sulfatide efficiently. Thus, the intracellular trafficking route of CD1a is essential for efficient presentation of lipid Ags that traffic through the early endocytic and recycling pathways.
Faculties and Departments:03 Faculty of Medicine > Departement Biomedizin > Department of Biomedicine, University Hospital Basel > Experimental Immunology (De Libero)
UniBasel Contributors:De Libero, Gennaro
Item Type:Article, refereed
Article Subtype:Research Article
Publisher:American Assoc. of Immunologists
Note:Publication type according to Uni Basel Research Database: Journal article
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Last Modified:07 Dec 2012 13:03
Deposited On:07 Dec 2012 13:01

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