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- W2085707816 abstract "The roles of AP-1 and NFkappaB in the regulation of inducible nitric oxide synthase (iNOS) mRNA expression induced by the combination of lipopolysaccharide and tumor necrosis factor-alpha (LT) in C6 cells were examined in the present study. The iNOS mRNA level and NO release were increased by several cytokines alone or combination treatments at 24 hr. LT-induced iNOS mRNA level was maximally increased at 6 hr and maintained at higher level at least up to 24 hr. At 6 hr, iNOS protein level and NO release were also increased by LT. By western blot analysis, AP-1, such as Fra-1, Jun B, and phospho-CREB protein levels were increased by LT and translocation of NFkappaB p52 from the cytoplasm to the nucleus was increased. In addition, phosphorylations of MAPKs (ERK 1/2, p38, JNK 1/2) were increased by LT. LT-induced iNOS mRNA level was inhibited by PD98059 (MEK 1/2 inhibitor), SB203580 (p38 inhibitor), and cycloheximide (a protein synthesis blocker), indicating that the phosphorylation of ERK 1/2 and p38, and on-going protein synthesis are necessary for LT-induced iNOS expression. Electrophoretic mobility shift assay (EMSA) showed that AP-1 and NFkappaB DNA binding activities were increased at 6 hr and these AP-1 and NFkappaB DNA bands increased by LT were super-shifted when Fra-1, Jun B, or NFkappaB p50 antibody was coincubated. These findings strongly suggest that, in C6 cells, Fra-1, Jun B, NFkappaB p50, and NFkappaB p52 appear to be involved in the regulation of iNOS mRNA induced by LT." @default.
- W2085707816 created "2016-06-24" @default.
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- W2085707816 date "2003-06-01" @default.
- W2085707816 modified "2023-09-23" @default.
- W2085707816 title "The regulation of inducible nitric oxide synthase gene expression induced by lipopolysaccharide and tumor necrosis factor-α in C6 cells: involvement of AP-1 and NFκB" @default.
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- W2085707816 doi "https://doi.org/10.1016/s0024-3205(03)00317-5" @default.
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