All viruses belong to the Ad5 serotype. On day 7, cultured DC were harvested, replaced at 1 × 106 cells/ml in serum-free RPMI 1640, and infected with adenoviruses at different multiplicities of infection (MOI) for 2 h (10, 25, 50, 100, and 200 MOI). Three hours later, complete RPMI 1640 were restored, and cells were cultured for another 2 days. DC were then washed

twice with complete medium before experiments. For pulsing with donor antigens, BN spleen cell lysate that was prepared by repeat freezing (5 min in dry ice–ethanol bath) and thawing (10 min in 37 °C warm bath) for 5 times, and added at 1/5 of DC/spleen cell (used to prepare lysate) ratio for the last 48 h of DC culture. Then, cells Tipifarnib in vivo were harvested, analysed by flow cytometer, and used as stimulators for mixed leucocyte reaction (MLR). Uninfected and Adv-0-DC served as control. To analyse gene check details expression of IKK2dn, RNA from AdV-0-DC and Adv-IKK2dn-DC was treated with DNase and reversely transcribed to cDNA. For IKK2dn polymerase chain reaction (PCR) analysis, the following primers were used: sense, 5′-GGCCTTTGAGTGCATCAC-3′ and antisense, 5′-CTCTAGGTCGTCCAGCGT-3′. All samples were run in triplicate. To assess the overall cDNA content, glyceraldehyde phosphate dehydrogenase (GAPDH) served as a housekeeping gene control. The following pair of primers was used for GAPDH: sense, 5′-GGAAGGTGAAGGTCGGAGTC-3′ and antisense, 5′-GTAGAGGCAGGGATGATGTTC-3′; The PCR was performed in a GeneAmp PCR System

2700 (Applied Biosystems Inc, Foster City, CA, USA) thermal cycler by 30 cycles of denaturization (94 °C, 30 s), annealing (55 °C, 30 s), and extension (72 °C, 1 min). Flow cytometry.  Expression of DC surface antigens was analysed by EPICS ELITE flow cytometer (Beckman-Coulter, Olopatadine Fullerton, CA, USA). Cell staining was performed as previously reported [16]; briefly, cells were stained with FITC or PE-conjugated mouse monoclonal antibodies anti-rat MHC class II, CD80 or CD86 after blocking non-specific binding with 10% vol/vol normal serum. FITC- or

PE-conjugated isotype-matched irrelevant mAbs were used as negative controls (all from Serotec Corp). Mixed lymphocyte reaction.  To maintain immature condition of DC, 7-day-cultured Lewis DC were infected with 25-100 MOI of AdV-IKK2dn. Adv-0-infected DC were used as control. To determine the antigen-presenting capacity of DC in vitro, MLR was performed with mitomycin C (MMC, 25 mg/ml for 30 min)-inactivated DC from different MOI groups as stimulators and nylon wool-purified Lewis or NB splenic T cells as responders. In Lewis T cell as responder cell experiments, Lewis DC pulsed with BN spleen cell lysate were used as stimulators, and DC not pulsed with alloantigen were used as control. The stimulator used was 3 × 102, 1 × 103, 3 × 103, and 1 × 104. Cultures were established in triplicate in 96-well round-bottom microculture plates (200 ul/well with 1 × 106 T cells) and maintained in complete medium for 72 h in 5% CO2 at 37 °C. MTT (0.