cell type: Bone Marrow Derived Macrophages treatment: received media alone (M0 condition)
On day 7 in culture the cells were washed, counted and replated in DMEM media (without L929 supernatant) at a density of 6-8^6 cells/well (6-well plate, Falcon polystyrene). Cells were classically activated (M1 condition) with LPS (100 ng/ml, Sigma-Aldrich) + IFN-γ (20ng/mL, E-bioscience, San Diego, CA) or alternatively activated (M2 condition) with IL-4 (20ng/mL, E-bioscience) or received media alone (M0 condition). Cells were harvested at 24 hours post-stimulation, by washing in phosphate buffered saline (PBS) before cell lysis in miRVana Lysis buffer (Life Technologies) for total RNA isolation.
To generate BMDM, the bone marrow cells from femurs and tibias from mice were harvested and cultured. Briefly, isolated cells were incubated in Dulbecco’s Modified Eagle Media (DMEM, Mediatech, Herndon, VA) supplemented with 10% heat-inactivated fetal bovine serum (FBS) (Life Technologies, Grand Island, NY)), 1% penicillin/streptomycin, 1% glutamine, and 20% L929 cell supernatant (containing macrophage colony stimulating factor).
To examine miRNA expression, cells were isolated using the miRVana isolation kit (Life Technologies) according to manufacturer specifications.
Samples were enzymatically labeled using BioArray HighYield RNA Transcript Labeling kit (Enzo)
Samples were hybridized to Affymetric 430_2 array using Herring sperm DNA, acetlylated BSA (50 mg/ml) and, Bioarray Eukaryotic Hybridization controls (Enzo Life Sciences), heated 650C 5 minutes, 990C 5 minutes, 450C 5 minutes, centrifuge top speed for 5 minutes, hybridize 16 hours at 450C at 60 rpm; Fluidics script EukGE-WS2v4_450
Affymetrix Gene ChIP scanner 30007G using Command Console
Raw data were normalized with the RMA algorithm implemented in the ‘‘Expression File Creator’’ module from the GenePattern software package. Data were visualized with the Multiplot modules from GenePattern.