Ex vivo MΦ were enriched from mice via bronchoalveolar lavage or peritoneal lavage with DMEM + 10% FBS + 1% MEM non-essential amino acids (Cellgro 25–025-CI) + 100 U/mL Penicillin + 100 mg/mL Streptomycin (Sigma P4333). Lavage cells were treated with ACK lysis buffer (0.15M NH4Cl, 10mM KHCO3, 0.1mM EDTA) to lyse red blood cells, plated in tissue culture treated plates, and incubated at 37°C in 5% CO2 for at least 4 hours to allow adherence of MΦ14 (link). Wells were washed vigorously with PBS to remove non-adherent cells and lysed in 2X Laemmli buffer for western blot analysis.
Bone marrow derived MΦ were isolated from femurs and tibias of mice, and cultured in DMEM + 20% FBS + 10% supernatant from 3T3 cells overexpressing M-CSF + 1% MEM non-essential amino acids (Cellgro 25–025-CI) + 100 U/mL Penicillin and 100 μg/mL Streptomycin (Sigma P4333) at 37° C in 5% CO2.
PMN for ex vivo western blotting analysis were purified from uninfected bone marrow by negative selection via MACS column (Miltenyi Biotech, 130-097-658) according to manufacturer’s guidelines and immediately lysed in 2X Laemmi buffer.