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CUTTING EDGE |



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Department of Medical and Molecular Parasitology, New York University School of Medicine, New York, NY 10010; and
Department of Molecular Biology, Princeton University, Princeton, NJ 08544
Biochemical analysis has suggested that self GPI anchors are the
main natural ligand associated with mouse CD1d molecules. A recent
study reported that V
14+ NK T cells responded to self as
well as foreign (parasite-derived) GPIs in a CD1d-dependent manner. It
further reported that the IgG response to the Plasmodium
berghei malarial circumsporozoite (CS) protein was severely
impaired in CD1d-deficient mice, leading to a model whereby NK T cells,
upon recognition of CD1d molecules presenting the CS-derived GPI
anchor, provide help for B cells secreting anti-CS Abs. We tested
this model by comparing the anti-CS Ab responses of wild-type,
CD1d-deficient, and MHC class II-deficient mice. We found that the IgG
response to the CS protein was solely MHC class II-dependent.
Furthermore, by measuring the response of a broad panel of
CD1d-autoreactive T cells to GPI-deficient CD1d-expressing cells, we
found that GPIs were not required for autoreactive
responses.
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