Human cartilage sample was obtained from the patient
undergoing knee replacement surgery after ethical committee
approval and informed consent from the patient. Chondrocytes
were prepared by the enzymatic digestion of cartilage with 0.25%
collagen and plated (1106 cells/ml) in 35 mm primaria-coated
culture dishes. The cells were cultured in DMEM: Hams F12
containing 2 mM L-glutamine, 10% FBS, 100 Units/ml penicillin and
100mg/ml streptomycin and grown in 5% CO2 incubator at 37 C.
2.3. Cell viability determination
RAW264.7, SW1353 and human primary chondrocytes were
seeded at a density of 5 105 cells/ml in 96-well plates. The cells
were treated with different concentrations (0–100mg/ml) of OBW
and OBM for 24 h. Cell viability was determined by MTT assay as
described previously (Koppikar et al., 2010; Choudhari et al., 2013)