Determination of nitric oxide status in RAW264.7 cells treated with GTA+ve and GTA-ve extracts. RAW264.7 cells were pre-treated for 4 hours with GTA+ve or GTA-ve extracts followed by the addition of LPS (1 ug/ml) for 20 hours. (A) Nitric oxide levels in cells were determined using Griess reagent, (B) NOS2 mRNA transcript levels were determined by real-time rtPCR, and (C) NOS protein (treatment with 80 ug/ml) assessed by Western blot (NS, non-specific). Asterisks indicate p < 0.05 relative to LPS treatment alone, and FA mix in (C) represents a 100 uM equal mixture of 18:1, 18:2 and 18:3 fatty acids. Data are expressed as the average of three duplicate experiments ± 1S.D.