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J. Exp. Med.
© The Rockefeller University Press
0022-1007/97/03/1101/12 $2.00
Volume 185, Number 6, March 17, 1997 1101-1112

The Enigmatic Plasmacytoid T Cells Develop into Dendritic Cells with Interleukin (IL)-3 and CD40-Ligand

By Géraldine Grouard,* Marie-Clotilde Rissoan,* Luis Filgueira,Dagger Isabelle Durand,* Jacques Banchereau,* and Yong-Jun Liu*

From * Schering-Plough, Laboratory for Immunological Research, 69571 Dardilly, France; and Dagger  Institute of Anatomy, Division of Cell Biology, University Irchel-Zurich, 8057 Zurich, Switzerland

A subset of CD4+CD11c-CD3- blood cells was recently shown to develop into dendritic cells when cultured with monocyte conditioned medium. Here, we demonstrate that CD4+ CD11c-CD3- cells, isolated from tonsils, correspond to the so-called plasmacytoid T cells, an obscure cell type that has long been observed by pathologists within secondary lymphoid tissues. They express CD45RA, but not markers specific for known lymphoid- or myeloid-derived cell types. They undergo rapid apoptosis in culture, unless rescued by IL-3. Further addition of CD40-ligand results in their differentiation into dendritic cells that express low levels of myeloid antigens CD13 and CD33.


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