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Assistance of Microbial Glycolipid Antigen Processing by CD1e
Henri de la Salle,1*Sabrina Mariotti,2*Catherine Angenieux,1*Martine Gilleron,3*Luis-Fernando Garcia-Alles,4Dag Malm,5Thomas Berg,6Samantha Paoletti,2Blandine Maître,1Lionel Mourey,4Jean Salamero,7Jean Pierre Cazenave,8Daniel Hanau,1Lucia Mori,2Germain Puzo,3Gennaro De Libero2
Complexes between CD1 molecules and self or microbial glycolipidsrepresent important immunogenic ligands for specific subsetsof T cells. However, the function of one of the CD1 family members,CD1e, has yet to be determined. Here, we show that the mycobacterialantigens hexamannosylated phosphatidyl-myo-inositols (PIM6)stimulate CD1b-restricted T cells only after partial digestionof the oligomannose moiety by lysosomal -mannosidase and thatsoluble CD1e is required for this processing. Furthermore, recombinantCD1e was able to bind glycolipids and assist in the digestionof PIM6. We propose that, through this form of glycolipid editing,CD1e helps expand the repertoire of glycolipidic T cell antigensto optimize antimicrobial immune responses.
1 INSERM, U725, Etablissement Francais du Sang-Alsace, F-67065 Strasbourg, France. 2 Experimental Immunology, Department of Research, Basel University Hospital, CH-4031 Basel, Switzerland. 3 CNRS, UMR 5089, Immunochimie et Glycoconjugués Mycobacteriens, Institut de Pharmacologie et de Biologie Structurale, F-31077 Toulouse Cedex, France. 4 Biophysique Structurale, Département Mécanismes Moléculaires des Infections Mycobactériennes, Institut de Pharmacologie et de Biologie Structurale, F-31077 Toulouse Cedex, France. 5 Department of Medicine, University Hospital of Northern Norway, N-9038 Tromsø, Norway. 6 Department of Pathology, University Hospital of Northern Norway, N-9038 Tromsø, Norway. 7 CNRS, UMR 144, Institut Curie, F-75005 Paris, France. 8 INSERM, U311, Etablissement Francais du Sang-Alsace, F-67065 Strasbourg, France.
* These authors contributed equally to this work.
To whom correspondence should be addressed. E-mail: gennaro.delibero{at}unibas.ch (G.D.L.); germain.puzo{at}ipbs.fr (G.P.)
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