Reprogram glioblastoma (GBM) human cell line into DC

3 human GBM cell lines were reprogrammed into DC by lentiviral vectors containing SPI1, IKZF1 ORF expression clones for human CFDs were purchased from Genecopoeia, and sequence verified. For PU.1 constructs, cDNAs encoding human full-length PU.1 (Spi1) were cloned into the lentiviral response plasmid pSF-Lenti that contains PGK-puro to generate pSF-Lenti-PU.1 . For lentiviral production, 7.5x106 HEK 293T cells were plated overnight in intact DMEM in a 10cm Poly-D lysine hydrobromide (SIGMA) coated dish, followed by transfection with a 2:1 ratio of total DNA in PEI (µg) together with the viral packaging and envelop plasmids PSPAX2 and PMD2.G, respectively in advanced DMEM medium supplemented with 1.25%FBS, 1X pyruvate, 10mM HEPES and 10mM sodium butyrate. Media were replaced at 16 hrs. after transfection. Viral supernatants were collected every 24hrs and centrifuged for 20hrs. at 25,000g to sediment viral particles, which were resuspended in opti-MEM and viral titers measured. Human GBM cell lines LN428, LN308, LN827 were cultured in DMEM media with 10% FBS and 1% pen/strep. For transduction of CFD-containing lentiviruses, GBM cells in baseline DMEM media were incubated with indicated lentiviral constructs for 24hrs., followed by media replacement to RPMI 1640 supplemented with 10% FBS, 1% pen/strep and 3µg/µl puromycin for selection. On day 7 after transduction, cells were passaged into RPMI 1640 media supplemented with 10% FBS and 1% pen/strep without puromycin until analysis. For all of the samples from three cell human GBM cell lines, are derived from in vitro reprogramming by indicated factors for 7 days. Samples with pSF is the empty vector control for reprogramming, cells are collected after reprogramming. Samples with CD45+ are CD45+ positive population sorted by FACS human monocytes derived DC are purchased from Lonza. "mature" groups are maturated by KR-luc tumor lysate and TNFalpha, IL-6,IL-1beta