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• W2000949667 abstract "alpha-Melanocyte-stimulating hormone (alpha-MSH) is an endogenous tridecapeptide that exerts anti-inflammatory actions and abrogates postischemic renal injury in rodents. alpha-MSH inhibits lipopolysaccharide (LPS)-induced gene expression of several cytokines, chemokines, and nitric oxide synthase-2 (NOS2), but the molecular mechanisms underlying these effects have not been clearly defined. To test the hypothesis that alpha-MSH inhibits the expression of inducible trans-activating factors involved in NOS2 regulation, we used RAW 264.7 macrophage cells to examine the effects of alpha-MSH on the activation of nuclear factor-kappaB (NF-kappaB) and CCAAT/enhancer binding protein-beta (C/EBPbeta), trans-acting factors known to be involved in LPS + interferon (IFN)-gamma induction of the NOS2 gene.Gel shift assays were performed to identify NF-kappaB and C/EBP DNA binding activities in LPS + IFN-gamma-treated RAW 264.7 cells in the presence and absence of alpha-MSH. NOS2 promoter assays were conducted to identify the effects of alpha-MSH on LPS + IFN-gamma-mediated induction of NOS2 transcription.Gel shift assays demonstrated LPS + IFN-gamma induction of NF-kappaB and C/EBP family protein-DNA complexes in nuclei harvested from the cells. Supershift assays revealed that the C/EBP complexes were comprised of C/EBPbeta, but not C/EBPalpha, C/EBPdelta, or C/EBPepsilon. alpha-MSH (100 nmol/L) inhibited the LPS + IFN-gamma-mediated induction of nuclear DNA binding activity of C/EBPbeta, but not that of NF-kappaB (in contrast to reports in other cell types), as well as the activity of a murine NOS2 promoter-luciferase construct. In contrast, alpha-MSH (100 nmol/L) had no effect on the induction of NOS2 promoter-luciferase genes harboring deletion or mutation of the C/EBP box.These data indicate that alpha-MSH inhibits the induction of C/EBPbeta DNA binding activity and that this effect is a major mechanism by which alpha-MSH inhibits the transcription of the NOS2 gene. The inability of alpha-MSH to inhibit LPS + IFN-gamma induction of NF-kappaB in murine macrophage cells, which contrasts with inhibitory effects of the neuropeptide in other cell types, suggests that cell-type-specific mechanisms are involved." @default.
• W2000949667 created "2016-06-24" @default.
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• W2000949667 date "2000-06-01" @default.
• W2000949667 modified "2023-09-26" @default.
• W2000949667 title "α-MSH inhibits induction of C/EBPβ-DNA binding activity and NOS2 gene transcription in macrophages" @default.
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• W2000949667 doi "https://doi.org/10.1046/j.1523-1755.2000.00084.x" @default.
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