Research Article

New Role for L-Arginine in Regulation of Inducible Nitric-Oxide-Synthase-Derived Superoxide Anion Production in Raw 264.7 Macrophages

Figure 5

NOS inhibitors-dependent regulation of LPS-induced nitrite accumulation and O 2 production in RAW 264.7 cells stimulated by LPS. Cells were pretreated with NOS inhibitors at the indicated concentrations in the presence of DMEM media containing 400 μM of L-arginine. (a) The LPS-induced iNOS protein expression and nitrite accumulation were determined after 24 h of cell incubation ( 𝑛 = 6 ). (b) The O 2 production was measured in the presence of DMEM media containing 400 μM of L-arginine in two time points: 10 and 15 h after LPS administration ( 𝑛 = 6 ). 𝑃 < 0 . 0 5 .
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321979.fig.005b
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