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The Journal of Immunology, Vol 155, Issue 11 5427-5435, Copyright © 1995 by American Association of Immunologists
ARTICLES |
C Caux, C Massacrier, C Dezutter-Dambuyant, B Vanbervliet, C Jacquet, D Schmitt and J Banchereau
Schering-Plough, Laboratory for Immunologic Research, Dardilly, France.
Earlier studies have concluded that fresh Langerhans cells (LC) are able to capture and process native Ags, whereas cultured LC have lost these functions while acquiring the capacity to prime naive T cells. Herein we studied the functions of human dendritic/Langerhans cells (d- Lc) generated in vitro by culturing CD34+ hemopoietic progenitor cells in the presence of granulocyte-macrophage CSF (GM-CSF) + TNF-alpha. Less than 50 d-Lc were found to strongly stimulate the proliferation of 2.5 x 10(4) allogeneic naive CD4+ T cells. Furthermore, six to 50 d-Lc induced half-maximal proliferation of naive syngeneic CD4+ cord blood T cells, in the presence of picomolar concentrations of superantigens. During the alloreaction, the CD4+ T cells were expanded up to 100-fold within two successive stimulation cycles with the same d-Lc, and the recovered T cells were specific for the d-Lc alloantigen. HLA-matched tetanus toxoid (TT)-specific T cell clones were found to proliferate in response to TT presented by CD1a+ d-Lc. Finally, electron microscopy demonstrated that CD1a+ d-Lc were able to capture an Ag (gold-labeled Igs) through receptor-mediated endocytosis. Thus, in vitro generated d- Lc can prime naive T cells and process native Ags, a property that might eventually prove useful for priming Ag-specific naive T cells for cellular immunotherapy.
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