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J. Exp. Med., Volume 188, Number 8, October 19, 1998 1521-1528

CD1d-mediated Recognition of an alpha -Galactosylceramide by Natural Killer T Cells Is Highly Conserved through Mammalian Evolution

By Laurent Brossay,* Mariacristina Chioda,Dagger Nicolas Burdin,* Yasuhiko Koezuka,§ Giulia Casorati,Dagger Paolo Dellabona,Dagger and Mitchell Kronenberg*

From the * La Jolla Institute of Allergy and Immunology, San Diego, California 92121; Dagger  DIBIT, H.S. Raffaele Institute, I-20132 Milano, Italy; and § Pharmaceutical Research Laboratory, Kirin Brewery Co., Ltd., Gunma 370-12, Japan

Natural killer (NK) T cells are a lymphocyte subset with a distinct surface phenotype, an invariant T cell receptor (TCR), and reactivity to CD1. Here we show that mouse NK T cells can recognize human CD1d as well as mouse CD1, and human NK T cells also recognize both CD1 homologues. The unprecedented degree of conservation of this T cell recognition system suggests that it is fundamentally important. Mouse or human CD1 molecules can present the glycolipid alpha -galactosylceramide (alpha -GalCer) to NK T cells from either species. Human T cells, preselected for invariant Valpha 24 TCR expression, uniformly recognize alpha -GalCer presented by either human CD1d or mouse CD1. In addition, culture of human peripheral blood cells with alpha -GalCer led to the dramatic expansion of NK T cells with an invariant (Valpha 24+) TCR and the release of large amounts of cytokines. Because invariant Valpha 14+ and Valpha 24+ NK T cells have been implicated both in the control of autoimmune disease and the response to tumors, our data suggest that alpha -GalCer could be a useful agent for modulating human immune responses by activation of the highly conserved NK T cell subset.

Key words: CD1natural killer T cellsantigen presentationglycolipidcytokines


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