Regulation of CD1a Surface Expression and Antigen Presentation by Invariant Chain and Lipid Rafts

Sloma, I. and Zilber, M. T. and Vasselon, T. and Setterblad, N. and Cavallari, M. and Mori, L. and De Libero, G. and Charron, D. and Mooney, N. and Gelin, C.. (2008) Regulation of CD1a Surface Expression and Antigen Presentation by Invariant Chain and Lipid Rafts. Journal of immunology, Vol. 180, H. 2. pp. 980-987.

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Official URL: http://edoc.unibas.ch/dok/A6003582

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In immature dendritic cells (DCs), CD1a is almost exclusively expressed at the cell surface and its membrane organization is poorly understood. In this study, we report that MHC class II, invariant chain (Ii), and CD9 molecules are coimmunoprecipitated with CD1a in immature DCs, and that CD1a/Ii colocalization is dependent on lipid raft integrity. In HeLa-CIITA cells CD1a expression leads to increased Ii trafficking to the cell surface, confirming the relevance of this association. Furthermore, silencing of Ii in DCs induces significant CD1a accumulation on the plasma membrane whereas the total CD1a expression remains similar to that of control cells. These data suggest that CD1a recycling is facilitated by the association with the Ii. The CD1a localization in lipid rafts has functional relevance as demonstrated by inhibition of CD1a-restricted presentation following raft disruption. Overall, these findings identify Ii and lipid rafts as key regulators of CD1a organization on the surface of immature DCs and of its immunological function as Ag-presenting molecule.
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:08 Nov 2012 16:23
Deposited On:08 Nov 2012 16:18

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