The Indoleamine-2,3-Dioxygenase (IDO) Inhibitor 1-Methyl-D-tryptophan Upregulates IDO1 in Human Cancer Cells
Figure 2
1-D-MT reduces T cell proliferation in cocultures of SKOV-3 cells with mixed leukocyte reactions.
(A) Alloreactive T cell proliferation after addition of 25 µM kyn to mixed leukocyte reactions (MLR). (B) Alloreactive T cell proliferation in the presence of 6000 SKOV-3 cells. (C) T cell proliferation in MLR cocultured with 2000 control SKOV-3 cells (white bar) or 2000 SKOV-3 cells with a knockdown of IDO1 (black bar). (D) T cell proliferation in cocultures of MLR with 2000 SKOV-3 cells after addition of increasing concentrations of 1-L-MT. (E) T cell proliferation in cocultures of MLR with 2000 SKOV-3 cells after addition of increasing concentrations of 1-D-MT. (F) Representative result of MLR/SKOV-3 coculture experiments with PBMC from five different donors and 2000 or 6000 SKOV-3 cells. Cells were treated with or without 1 mM 1-D-MT in combination with or without 250 µM trp. Proliferation was measured by 3[H] methylthymidine uptake. Experiments were performed at least in triplicate. Data are mean ± SEM. * (p<0.05).