RAW 264.7 cells were incubated for 24 h with LPS (1 μg/ml) in presence or absence of different tested compounds (10 μg/ml). Fifty microliter of cell culture supernatant were mixed with 50 μl of freshly prepared Griess reagent and incubated for 10 min. The absorbance was measured spectrophotometrically at 540 nm. A standard curve was plotted using serial concentrations of sodium nitrite. The nitrite content was normalized to the cellular protein content as measured by bicinchoninic acid assay.13 and 14

The NO inhibition percentage was calculated by submitting the nitrite contents of cell supernatant of cultures treated with DMSO (control), LPS, or LPS/tested compounds according to the following equation: (Nitritescompound−Nitritescontrol)/(NitritesLPS−Nitritescontrol)×100(Nitritescompound−Nitritescontrol)/(NitritesLPS−Nitritescontrol)×100 SB431542 in vivo TNF-α, an indicator of inflammation, was measured by ELISA kit of the supernatant of RAW 264.7 incubated for 24 h with LPS in presence and

absence of tested compounds (10 μg/ml), where the concentration of TNF-α in samples was calculated from a plotted standard curve using the recombinant TNF-α, measured by the supplied ELISA kit, and then normalized to the protein concentration in each sample (data was expressed as ng/mg protein). The inhibition percentages of LPS-induced TNF-α generation are an indicator for anti-inflammatory activity of the tested samples.15 this website Cytotoxicity of tested extract only was measured against Hep-G2, MCF-7 and HCT-116 cells using MTT cell viability assay,11 which is based on the ability of active mitochondrial dehydrogenase enzyme of living cells to

cleave the tetrazolium rings of the yellow MTT and form a dark blue insoluble formazan crystals which is largely impermeable to cell membranes, resulting in its accumulation within healthy cells. The number of viable cells is directly proportional to the level of soluble formazan dark blue color. The extent of the reduction of MTT was quantified by measuring the absorbance at 570 nm using microplate ELISA reader. Data were expressed as the percentage of relative viability compared with the untreated cells compared with the vehicle control, with cytotoxicity indicated by <100% relative viability. Then the half maximal growth inhibitory concentration (IC50) was calculated from the equation of the dose-dependent response curve and percentage of relative viability was calculated using the following equation: [Absorbanceoftreatedcells/Absorbanceofcontrolcells]×100 Tested samples were evaluated for antibacterial activity against six different bacterial strains using the agar diffusion method.16 A loopful of the test organisms was inoculated into 5.0 ml of nutrient broth and incubated at 37 °C for 24 h, and then 0.