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CUTTING EDGE |
Oklahoma Medical Research Foundation, Oklahoma City, OK 73104
Dendritic cells (DC) have the specific capacity of initiating
primary T cell responses and ultimately derive from precursors in bone
marrow. DC were originally thought to be only of myeloid origin, and
myeloid precursor cells could be induced to differentiate into
functional DC in response to granulocyte-macrophage (GM)-CSF. However,
early CD4low precursor cells from the thymus can also
develop into DC when cultured in IL-1ß, IL-3, IL-7, TNF-
, stem
cell factor, and Flt-3L. In that case, GM-CSF was not required.
We now show that CD19+ pro-B cells develop into DC with T
cell stimulatory properties when cultured under similar conditions.
These pro-B cells acquired the DC-related markers CD11c and
NLDC145/DEC205, along with CD80/B7-1, CD86/B7-2, and a high density of
MHC class II Ags. The marrow-derived DC did not express CD4 or CD8
,
which are markers related to thymic DC. These findings are consistent
with a new pathway through which DC are generated from B lymphoid
precursors.
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