Lipiodol transfected DC are immune modulatory. A. Day 7 bone marrow derived DC were cultured alone or transfected with mismatched siRNA, or IL-12p35-specific siRNA using 3 μl/culture lipiodol. Following a 24 hour incubation cells were plated at 1 × 106 in 6 well culture dishes and activated for 24 hours with 10 ng/ml LPS and 10 ng/ml TNF-α. Supernatant was harvested and analyzed by ELISA for IL-10 production. B. C57/BL6 DC were transfected with mismatched siRNA, IL-12p35-specific siRNA or lipiodol alone, irradiated (3,000 rad) and seeded in triplicate at various concentrations in a flat-bottom 96-well plate. Splenic T cells from BALB/c mice were added as responders (5 × 105 cells/well). The mixed lymphocytes were cultured for 72 h and proliferation was assessed by thymidine incorporation. C &D. IFN-γ and IL-4 concentrations, respectively, were assessed from MLR cultures at 48 hours of incubation.