lipoxygenase/نخر

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Priming for the synthesis of 5-lipoxygenase products in human blood ex vivo by human granulocyte-macrophage colony-stimulating factor and tumor necrosis factor-alpha.

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BACKGROUND Previous studies reported the priming effects of granulocyte-macrophage colony-stimulating factor (GM-CSF) and tumor necrosis factor-alpha (TNF alpha) on leukotriene synthesis by isolated polymorphonuclear leukocytes; however, little is known as of yet of these biologic effects of the two

5-lipoxygenase-activating protein gene expression. Key role of CCAAT/enhancer-binding proteins (C/EBP) in constitutive and tumor necrosis factor (TNF) alpha-induced expression in THP-1 cells.

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We examined expression of the 5-lipoxygenase activating protein (FLAP), which is critical for inflammatory cell leukotriene synthesis. A 3.4-kb segment of the FLAP gene 5'-untranslated region accounted for a 22-fold increase in promoter activity when transfected into the monocyte-like cell line,

Lipoxygenase inhibitors but not site specific 5-lipoxygenase blockers protect against endotoxic shock and inhibit production of tumor necrosis factor.

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In the present study it was found that lipoxygenase inhibitors prevent LPS-, but not tumor necrosis factor alpha (TNF alpha)-evoked lethality. The specific 5-lipoxygenase inhibitors (MK-886, CGS-8515) were uneffective in endotoxin-induced shock. The 5-lipoxygenase inhibitors interfered with LTC4

Lipoxygenase inhibitors suppress formation of tumor necrosis factor in vitro and in vivo.

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The LPS induced synthesis of tumor necrosis factor in macrophage cultures, as determined in a fibroblast cytolysis assay was found to be effectively blocked by inhibitors of lipoxygenases. Likewise, the presence of tumor necrosis factor in serum of D-galactosamine sensitized mice after challenge

Differential protective activities of site specific lipoxygenase inhibitors in endotoxic shock and production of tumor necrosis factor.

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Lipoxygenase inhibitors have been shown to exert beneficial effects in experimental models of endotoxin shock. In the present study it was found that lipoxygenase inhibitors prevented LPS, but not tumor necrosis factor alpha (TNF alpha)-evoked leukopenia in mice. These inhibitors protected against

Lipoxygenase inhibitors suppress formation of tumor necrosis factor in vitro and in vivo.

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Injection of endotoxin in D-galactosamine sensitized mice resulted in increased serum levels of tumor necrosis factor as determined in a fibroblast cytolysis assay. Concomitant injection of different lipoxygenase inhibitors decreased the titer of TNF. When the lipoxygenase inhibitors were tested in

Collagenase-3 induction in rat lung fibroblasts requires the combined effects of tumor necrosis factor-alpha and 12-lipoxygenase metabolites: a model of macrophage-induced, fibroblast-driven extracellular matrix remodeling during inflammatory lung injury.

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The mechanisms responsible for the induction of matrix-degrading proteases during lung injury are ill defined. Macrophage-derived mediators are believed to play a role in regulating synthesis and turnover of extracellular matrix at sites of inflammation. We find a localized increase in the

Arachidonic acid promotes glutamate-induced cell death associated with necrosis by 12- lipoxygenase activation in glioma cells.

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Glutamate induced glutathione (GSH) depletion in C6 rat glioma cells, which resulted in cell death. This cell death seemed to be apoptosis through accumulation of reactive oxygen species (ROS) or hydroperoxides representing cytochrome c release from mitochondria and internucleosomal DNA

Increased 5-lipoxygenase activity in massive hepatic cell necrosis in the rat correlates with neutrophil infiltration.

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Rats were treated with heat-killed Propionibacterium acnes and subsequent injection of a small amount of lipopolysaccharide after 7 days. After 24 hr most of the rats died of massive liver cell necrosis. Nonparenchymal liver cells were isolated from this liver injury model and incubated with

[Effect of exogenous leukotrienes and lipoxygenase inhibitors on apoptosis and necrosis in cultured rat hepatocytes].

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Liver cell death by apoptosis and necrosis occurs upon the liver injury. Lipoxygenase pathway of arachidonic acid metabolism is known to regulate the viability and apoptosis in some cell types, but its role in hepatocyte cell death is not fully understood. We studied the influence of leukotrienes

Evidence that interleukin-1 beta and tumor necrosis factor inhibit gastric fundus motility via the 5-lipoxygenase pathway.

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In this study, we compared the effects of interleukin-1 beta and tumor necrosis factor (TNF) on in vitro rat gastric fundus motility. Interleukin-1 beta produced rapid, concentration-dependent relaxation of rat gastric fundus strips, similar to that seen with TNF, with a maximal effect at 30 U/ml

Transcription, translation and secretion of interleukin 1 and tumor necrosis factor: effects of tebufelone, a dual cyclooxygenase/5-lipoxygenase inhibitor.

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We examined the effect of tebufelone, a dual cyclooxygenase (CO)/5-lipoxygenase (LO) inhibitor, on the synthesis, secretion and gene expression of interleukin (IL) 1 beta and tumor necrosis factor (TNF)-alpha by human peripheral blood mononuclear cells (PBMC). Basal concentrations of immunoreactive

Discovery of 3-(4-bromophenyl)-6-nitrobenzo[1.3.2]dithiazolium ylide 1,1-dioxide as a novel dual cyclooxygenase/5-lipoxygenase inhibitor that also inhibits tumor necrosis factor-alpha production.

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In the present study we have discovered compound 1, a benzo[1.3.2]dithiazolium ylide-based compound, as a new prototype dual inhibitor of cyclooxygenase (COX) and 5-lipoxygenase (5-LOX). Compound 1 was initially discovered as a COX-2 inhibitor, resulting indirectly from the COX-2 structure-based

Involvement of oxidants and oxidant-generating enzyme(s) in tumour-necrosis-factor-alpha-mediated apoptosis: role for lipoxygenase pathway but not mitochondrial respiratory chain.

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Cellular signalling by the inflammatory cytokine tumour necrosis factor alpha (TNF alpha) has been suggested to involve generation of low levels of reactive oxygen species (ROS). Certain antioxidants and metal chelators can inhibit cytotoxicity and gene expression in response to TNF alpha in

The involvement of macrophage-derived tumour necrosis factor and lipoxygenase products on the neutrophil recruitment induced by Clostridium difficile toxin B.

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Clostridium difficile (Cd) toxins appear to mediate the inflammatory response in pseudomembranous colitis and/or colitis associated with the use of antibiotics. In contrast to Cd Toxin A (TxA), Cd Toxin B (TxB) has been reported not to promote fluid secretion or morphological damage in rabbits and

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