MM-pDCs were cocultured either in DCP-MM medium (Mattek Corp. Ashland, MA) or complete RPMI-1640 medium supplemented with IL-3 (Peprotech Inc., Rocky Hill, NJ, USA). CD3-PE/FITC/APC; CD4-FITC/PE or APC-Cy7; CD8-APC/FITC, CD56-PE; CD123-PE/PE-Cy5/FITC; and CD138-FITC/PE/APC were obtained from BD Biosciences (San Jose, CA). BDCA-2-FITC and CD11c-APC were obtained from Miltenyi Biotec (Auburn, CA); CD303-, CD304-, CD107a, and PD-L1-BV421 were purchased from Biolegend. Immunomagnetic separation kits were purchased from Miltenyi Biotec. The CellTrace Violet and CellTracker Green flow assay kits were obtained from Life Technologies (USA). PD-L1 blocking antibody (anti-human PD-L1, clone MIH1) was obtained from eBiosciences [19 (link)]. HDAC6 inhibitor ACY241 and ENO inhibitor (ENOblock) [40 (link)] were purchased from Selleck Chemicals. WST-1 Cell Proliferation Reagent was purchased from Clontech Laboratories, Inc. (USA).