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- W2145108860 abstract "Abstract —We studied effects of nitric oxide (NO) released by different NO donors on induction of inducible NO synthase (iNOS) in rat aortic smooth muscle cells (RASMC) and rat macrophage cell line NR8383. iNOS protein expression induced by a CM (interleukin-1β 250 U/mL, interferon-γ 150 U/mL, and tumor necrosis factor-α 150 U/mL) was not affected by the NO donor SNAP (0.2 to 1 mmol/L) in RASMC at 24 hours of incubation but was dose-dependently decreased by SNAP in macrophages (maximal 60% inhibition). A fully functional −3.2-kb rat iNOS promoter was transfected into RASMC and macrophages. The CM-induced promoter activity in transfected macrophages was inhibited by SNAP (maximal 67% inhibition), but this inhibitory effect by SNAP was not observed in transfected RASMC. Electrophoretic mobility-shift assays demonstrated that nuclear factor-κB (NF-κB) binding patterns were different in 2 cell types and that the ratio of p50:p65 subunits was significantly lower in macrophages than in RASMC. Furthermore, NF-κB activity was not affected by SNAP in RASMC but was reduced by SNAP in macrophages. Another putative NO donor, NOR3 (1 mmol/L), completely inhibited iNOS induction by CM in RASMC, but this was accompanied by severe cytotoxicity, which resulted in cell death. Similar concentrations of SNAP did not exhibit cytotoxicity in RASMC, whereas macrophages demonstrated 88% viability compared with cells without SNAP. NO synthase inhibitor N g -monomethyl- l -arginine significantly inhibited CM-induced nitrite production in both cell types and stimulated iNOS protein expression in macrophages but did not affect iNOS expression in RASMC. These data strongly suggest that NO may affect transcriptional regulation of iNOS differently in RASMC versus macrophages, possibly by means of regulation of NF-κB activation." @default.
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- W2145108860 date "2001-04-01" @default.
- W2145108860 modified "2023-10-13" @default.
- W2145108860 title "Nitric Oxide Differentially Regulates Induction of Type II Nitric Oxide Synthase in Rat Vascular Smooth Muscle Cells Versus Macrophages" @default.
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- W2145108860 doi "https://doi.org/10.1161/01.atv.21.4.529" @default.
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