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Baron, C; Raposo, G; Scholl, S M; Bausinger, H; Tenza, D; Bohbot, A; Pouillart, P; Goud, B; Hanau, D; Salamero, J
Journal of cell science, 03/2001, Letnik: 114, Številka: Pt 5Journal Article
The macrophage-colony stimulating factor (M-CSF) has been already shown to affect the function of dendritic cells (DC). Therefore, the differentiation of dendritic cells into macrophages (M(PHI)) might represent a pathway which could inhibit the immune response initiated by DC. Because Major Histocompatibility Complex class II molecules (MHC-II) are crucial for DC function, we asked whether M-CSF may influence the intracellular transport of MHC-II in monocyte derived DC. We found that, at early stages, M-CSF induced first a rapid redistribution of MHC-II from the MHC-II containing compartments (MIIC) to the plasma membrane and second an increase in MHC-II synthesis as observed with LPS or TNF-(alpha). These processes were associated with the sorting of MHC-II from lysosomal membranes which underwent a drastic structural reorganization. However, in contrast to tumor necrosis factor (TNF)-(alpha) or lipopolysaccharide (LPS), M-CSF neither potentiated the allostimulatory function of DC nor allowed the stabilization of MHC-II at the cell surface, but rather increased MHC-II turnover. We conclude that the rapid modulation of MHC-II transport and distribution may participate in the inhibitory effect of M-CSF on DC function and differentiation.
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