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J. Exp. Med., Volume 189, Number 1, January 4, 1999 103-110

Distinct Subsets of CD1d-restricted T Cells Recognize Self-antigens Loaded in Different Cellular Compartments

By Ya-Hui Chiu,* Jayanthi Jayawardena,* Angela Weiss,* Daniel Lee,* Se-Ho Park,* Alice Dautry-Varsat,Dagger and Albert Bendelac*

From the * Department of Molecular Biology, Princeton, New Jersey 08544; and the Dagger  Institut Pasteur, Unite de Biologie des Interactions Cellulaires, 75724 Paris Cedex 15, France

Although recent studies have indicated that the major histocompatibility complex-like, beta 2-microglobulin-associated CD1 molecules might function to present a novel chemical class of antigens, lipids and glycolipids, to alpha /beta T cells, little is known about the T cell subsets that interact with CD1. A subset of CD1d-autoreactive, natural killer (NK)1.1 receptor-expressing alpha /beta T cells has recently been identified. These cells, which include both CD4-CD8- and CD4+ T cells, preferentially use an invariant Valpha 14-Jalpha 281 T cell receptor (TCR) alpha  chain paired with a Vbeta 8 TCR beta  chain in mice, or the homologous Valpha 24-Jalpha Q/Vbeta 11 in humans. This cell subset can explosively release key cytokines such as interleukin (IL)-4 and interferon (IFN)-gamma upon TCR engagement and may regulate a variety of infectious and autoimmune conditions. Here, we report the existence of a second subset of CD1d-restricted CD4+ T cells that do not express the NK1.1 receptor or the Valpha 14 TCR. Like the Valpha 14+ NK1.1+ T cells, these T cells exhibit a high frequency of autoreactivity to CD1d, use a restricted albeit distinct set of TCR gene families, and contribute to the early burst of IL-4 and IFN-gamma induced by intravenous injection of anti-CD3. However, the Valpha 14+ NK1.1+ and Valpha 14- NK1.1- T cells differ markedly in their requirements for self-antigen presentation. Antigen presentation to the Valpha 14+ NK1.1+ cells requires endosomal targeting of CD1d through a tail-encoded tyrosine-based motif, whereas antigen presentation to the Valpha 14- NK1.1- cells does not. These experiments suggest the existence of two phenotypically different subsets of CD1d-restricted T cells that survey self-antigens loaded in distinct cellular compartments.

Key words: CD1self-antigenendosomeinterleukin 4interferon gamma


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