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Division of Rheumatology, Immunology, and Allergy, Department of Medicine, Brigham & Womens Hospital and Harvard Medical School, Boston, MA 02115
Individual CD1-restricted T cells can recognize either endogenous or foreign lipid Ags, but the extent to which the same CD1-restricted TCR can react to both self and microbial lipids is unknown. In this study, we have identified CD1a-, CD1b-, and CD1c-restricted T cells from normal human donors that induce cytolysis and secrete copious IFN-
in response to self-CD1 expressed on monocyte-derived dendritic cells. Remarkably, microbial Ags presented by CD1 are even more potent agonists for these same T cells. The 
T cell receptors from such clones are diverse and confer specificity for both self-CD1 and foreign lipid Ags. The dual reactivity of these CD1-restricted cells suggests that the capacity for rapid responses to inflammatory stimuli without memory coexists with the capacity for strong Ag-specific responses and the generation of memory in vivo.
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A. M. Russano, G. Bassotti, E. Agea, O. Bistoni, A. Mazzocchi, A. Morelli, S. A. Porcelli, and F. Spinozzi CD1-Restricted Recognition of Exogenous and Self-Lipid Antigens by Duodenal {gamma}{delta}+ T Lymphocytes J. Immunol., March 15, 2007; 178(6): 3620 - 3626. [Abstract] [Full Text] [PDF] |
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