Fresh or frozen bone marrow cells were used to generate BMDM as previously described [8] (link), using L929-cell conditioned medium (LCCM) as a source of granulocyte/macrophage colony stimulating factor [9] (link). The cells were resuspended in 10 ml bone marrow differentiation media (R20/30), which is RPMI1640 supplemented with 20% fetal bovine serum (Gibco, cat. 12657-029), 30% LCCM, 100 U/ml penicillin, 100 µg/ml streptomycin, and 2 mM L-glutamine. Cells were seeded in non-tissue culture treated Optilux Petri dishes (BD Biosciences) and incubated at 37°C in a 5% CO2 atmosphere. Four days after seeding the cells, an extra 10 ml of fresh R20/30 were added per plate and incubated for an additional 3 days. To obtain the BMDM, the supernatants were discarded and the attached cells were washed with 10 ml of sterile PBS. Ten ml of ice-cold PBS were added to each plate and incubated at 4°C for 10 minutes. The macrophages were detached by gently pipetting the PBS across the dish. The cells were centrifuged at 200× g for 5 minutes and resuspended in 10 ml of BMDM cultivation media (R10/5), which is composed of RPMI 1640, 10% fetal bovine serum, 5% LCCM and 2 mM L-glutamine. The cells were counted, seeded and cultivated in tissue culture plates 12 hours before any further experimental procedure.
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