DC2.4 cells were cultured in RPMI 1640 with IFN‐γ (10 ng/ml and 100 ng/ml), TNF‐α (10 ng/ml and 100 ng/ml) or LPS (0·5 µg/ml and 5 µg/ml) (all from PeproTech) for 3 h or 12 h at 37° in 5% CO2. Coimmunoprecipitation and Western blotting were carried out as previously described [45 (link), 46 with antibodies against CD11c, Hsp90, MHCII, Akt/p‐Akt and Erk1/2/p‐Erk1/2 (Cell Signaling Technology).