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J. Exp. Med.,
Volume 188, Number 8, October 19, 1998 1521-1528
-Galactosylceramide
by Natural Killer T Cells Is Highly Conserved through
Mammalian Evolution
By



From the * La Jolla Institute of Allergy and Immunology, San Diego, California 92121; 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
DIBIT,
H.S. Raffaele Institute, I-20132 Milano, Italy; and § Pharmaceutical Research Laboratory, Kirin
Brewery Co., Ltd., Gunma 370-12, Japan
-galactosylceramide (
-GalCer) to NK T cells from either species. Human T cells,
preselected for invariant V
24 TCR expression, uniformly recognize
-GalCer presented by
either human CD1d or mouse CD1. In addition, culture of human peripheral blood cells with
-GalCer led to the dramatic expansion of NK T cells with an invariant (V
24+) TCR and
the release of large amounts of cytokines. Because invariant V
14+ and V
24+ NK T cells
have been implicated both in the control of autoimmune disease and the response to tumors,
our data suggest that
-GalCer could be a useful agent for modulating human immune responses by activation of the highly conserved NK T cell subset.
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