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J. Exp. Med.
© The Rockefeller University Press
0022-1007/97/07/109/12 $2.00
Volume 186, Number 1, July 7, 1997 109-120

Requirements for CD1d Recognition by Human Invariant Valpha 24+ CD4minus CD8minus T Cells

By Mark Exley,* Jorge Garcia,* Steven P. Balk,* and Steven PorcelliDagger

From the * Cancer Biology Program, Hematology/Oncology Division, Beth Israel Deaconess Medical Center and Harvard Medical School, Boston, Massachusetts 02215; and Dagger  Lymphocyte Biology Section, Division of Rheumatology, Immunology, and Allergy, Brigham and Women's Hospital and Harvard Medical School, Boston, Massachusetts 02115

A subset of human CD4-CD8- T cells that expresses an invariant Valpha 24-Jalpha Q T cell receptor (TCR)-alpha chain, paired predominantly with Vbeta 11, has been identified. A series of these Valpha 24 Vbeta 11 clones were shown to have TCR-beta CDR3 diversity and express the natural killer (NK) locus-encoded C-type lectins NKR-P1A, CD94, and CD69. However, in contrast to NK cells, they did not express killer inhibitory receptors, CD16, CD56, or CD57. All invariant Valpha 24+ clones recognized the MHC class I-like CD16 molecule and discriminated between CD1d and other closely related human CD1 proteins, indicating that recognition was TCR-mediated. Recognition was not dependent upon an endosomal targeting motif in the cytoplasmic tail of CD1d. Upon activation by anti-CD3 or CD1d, the clones produced both Th1 and Th2 cytokines. These results demonstrate that human invariant Valpha 24+ CD4-CD8- T cells, and presumably the homologous murine NK1+ T cell population, are CD1d reactive and functionally distinct from NK cells. The conservation of this cell population and of the CD1d ligand across species indicates an important immunological function.


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