Primary monocyte-derived DCs were differentiated from CD14+ peripheral blood monocytes, and matured with LPS(100ng mL−1) for 2 days prior to use.10 (link) Primary human CD4+ T cells were positively isolated from CD14-depleted peripheral blood mononuclear cells (PBMCs) using CD4-conjugated magnetic beads and LS MACS cell separation columns (Miltenyi Biotech). Positively isolated CD4+ T cells were activated with 2% PHA (Invitrogen) for 2 days, washed and cultured in IL-2 (50 U/mL) containing RPMI supplemented with 10% FBS.