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From the Institut National de la Sante et de la Recherche Medicale U437 and Institut de
Transplantation et de Recherche en Transplantation, Immeuble Jean Monnet, 44093 Nantes Cédex 1, France
Dendritic cells (DC) are a subset of leukocytes whose major function is antigen presentation.
We investigated the phenotype and function of enriched (95-98.5%) rat DC. We show that
both spleen and thymus DC express the natural killer cell receptor protein 1 (NKR-P1) as a
disulfide linked homodimer of 60 kD. Freshly isolated DC express a low level of NKR-P1,
which is strongly upregulated after overnight culture. Spleen, but not thymus DC, were able to
kill the NK-sensitive YAC-1 cell line in vitro, and since this killing was Ca2+ dependent, a Fas
ligand-Fas interaction was probably not involved. Besides their potent antigen-presenting
function, DC can thus be cytotoxic for some tumor targets.
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