Abstract
For members of the CD1 family of β2-microglobulin–associated lipid-presenting molecules, tyrosine-based motifs in the cytoplasmic tail and invariant chain (Ii) govern glycoprotein trafficking through endosomal compartments. Little is known about the intracellular pathways of CD1 trafficking and antigen presentation. However, in vitro studies with cells transfected with mutant CD1 that had a truncated cytoplasmic tail have suggested a role for these tyrosine motifs in some, but not all, antigenic systems. By introducing a deletion of the tyrosine motif into the germ line, and through homologous recombination in embryonic stem cells, we now describe knock-in mice with the CD1d cytoplasmic tail deleted. Despite adequate surface CD1d expression and the presence of Ii, these mutant mice showed multiple and selective abnormalities in intracellular trafficking, antigen presentation and T cell development, demonstrating the critical functions of the CD1d cytoplasmic tail motif in vivo.
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Acknowledgements
We thank B. Jabri, G. Waters and M. Weigert for advice and discussions and J. Goodhouse for help with confocal microscopy. Supported by grants from the Korea Research Foundation (grant 2001-015-DS0063 to S.-H. P.), ACS and NIH (to A. B.) as well as the Cancer Research Institute (Y.-H. C.), the Leukemia and Lymphoma Society of America (K. B.) and the Human Frontier Science Program (C. F.).
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Chiu, YH., Park, SH., Benlagha, K. et al. Multiple defects in antigen presentation and T cell development by mice expressing cytoplasmic tail–truncated CD1d. Nat Immunol 3, 55–60 (2002). https://doi.org/10.1038/ni740
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DOI: https://doi.org/10.1038/ni740
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