Murine BMDMs were obtained as described17 (link) and maintained in DMEM supplemented with 10% FBS and 10% L929 cell supernatant as conditioned medium providing macrophage colony stimulating factor (M-CSF). Recombinant mouse IFN-γ was from Peprotech and used at 10 ng/ml. Cell culture grade LPS and CHX were purchased from Sigma-Aldrich. Pam3Cys was purchased from EMC Microcollections. LPS was used as 1 ng/ml and Pam3Cys was used at 10 ng/ml unless otherwise noted. A γ-secretase inhibitor GSI-34 was used at 10 µM as previously described46 (link). U0126, SB203580, SP600125, and CGP57380 were from Calbiochem.