Figure 2. Enhancement of Nod2 signaling by poly I:C and the chemotherapeutic molecule DMXAA is mediated via type-I IFNs.
(A and C) BMDMs from WT and Ifnar1−/− mice were left untreated (control) or pretreated with poly I:C (A), DMXAA, or IFN-β (C) for 24 h and then restimulated with MDP. Cell extracts were collected at the indicated times and assessed for MAPK and NF-κB activation using phosphospecific antibodies. (B and D) BMDMs from WT, Ifnar1−/− (B), or Nod2−/− mice (D) were treated with poly I:C, DMXAA, or left untreated for 24 h and then re-stimulated with MDP. Cell-free supernatants were analyzed for production of IL-6 and TNF-α (*** p < 0.001, compared with WT and mutant macrophage cultures). N.D. denotes not detected. Results are representative of 3 independent experiments. Data are expressed as mean ± S.D.