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Stran 1 iz 52 rezultatov
The arachidonic acid 5-lipoxygenase inhibitor nordihydroguaiaretic acid inhibits tumor necrosis factor alpha activation of microglia and extends survival of G93A-SOD1 transgenic mice.
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Familial forms of amyotrophic lateral sclerosis (ALS) can be caused by mutations in copper, zinc-superoxide dismutase (SOD1). Mice expressing SOD1 mutants demonstrate a robust neuroinflammatory reaction characterized, in part, by up-regulation of tumor necrosis factor alpha (TNFalpha) and its
Delayed thromboxane or tumor necrosis factor-alpha, but not leukotriene inhibition, attenuates prolonged pulmonary hypertension in endotoxemia.
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The early phase of endotoxin-induced acute hemodynamic disturbances and hypoxemia is mediated by various factors, including eicosanoids and tumor necrosis factor-alpha (TNF alpha). Thromboxane A2 is the major mediator of the early pulmonary hypertension associated with endotoxemia, but the
Inhibitors of arachidonic acid metabolism potentiate tumour necrosis factor-alpha-induced apoptosis in HL-60 cells.
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We investigated whether and how could various modulators of arachidonic acid metabolism affect apoptosis induced by tumour necrosis factor-alpha (TNF-alpha) in human myeloid leukaemia HL-60 cells. These included arachinonyltrifluoromethyl ketone (AACOCF3; cytosolic phospholipase A2 inhibitor),
Transcriptional and posttranscriptional regulation of macrophage-specific colony stimulating factor gene expression by tumor necrosis factor. Involvement of arachidonic acid metabolites.
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The effects of tumor necrosis factor (TNF) on the regulation of macrophage-specific colony stimulating factor (CSF-1) gene expression have been studied in HL-60 cells during monocytic differentiation. CSF-1 transcripts were undetectable in uninduced HL-60 cells, reached maximal levels by 3 h of
Cycloheximide or nordihydroguaiaretic acid protects mice against the lethal and hepatocytolytic effects of a combined challenge with D-galactosamine and bacterial endotoxin.
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Both cycloheximide and nordihydroguaiaretic acid protect mice against the fatalities and associated panlobular hepatocyte necrosis that follow a challenge with D-galactosamine and bacterial endotoxin. It is proposed that cycloheximide acts as an inhibitor of the endotoxin-induced activation of
Phospholipase A2 activation and autoinduction of tumor necrosis factor gene expression by tumor necrosis factor.
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Tumor necrosis factor (TNF) acts via a cell surface receptor to induce a variety of cellular events including cytolysis, differentiation, and mitogenesis. The mechanisms underlying the cell specific actions of TNF are not known. In the present study, postreceptor events associated with the
Modulation of tumor necrosis factor-alpha cytotoxicity in L929 cells by bacterial toxins, hydrocortisone and inhibitors of arachidonic acid metabolism.
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L929 cells were incubated with tumor necrosis factor-alpha (TNF-alpha) in the presence or absence of various inhibitors of arachidonic acid metabolism. The addition of either hydrocortisone or nordihydroguaiaretic acid (NDGA) decreased the cytotoxic effect of TNF-alpha but exogenously added
Induction of tumor necrosis factor-alpha by UVB: a role for reactive oxygen intermediates and eicosanoids.
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UVB irradiation induces nuclear factor-kappaB (NF-kappaB) activation, tumor necrosis factor-alpha (TNF-alpha) expression and reactive oxygen intermediates (ROI) in keratinocytes. We investigated whether ROI play a role in UVB-induced TNF-alpha mRNA expression. The antioxidants N-acetyl cysteine,
New pathogenetic hypothesis for Wolman disease: possible role of oxidized low-density lipoproteins in adrenal necrosis and calcification.
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Wolman disease in an inherited metabolic disease, characterized by a severe deficiency of the acid lipase and a massive lysosomal storage of triacylglycerols and cholesteryl esters, associated with hepatosplenomegaly, adrenal calcification and nearly always fatal in the first year of life. Cultured
Tumor necrosis factor-alpha enhances mRNA expression and secretion of interleukin-6 in cultured human airway smooth muscle cells.
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Airway smooth muscle (ASM) is considered to be an end-target cell for the effects of mediators released during airway wall inflammation. Several reports suggest that activated ASM may be capable of generating various proinflammatory cytokines. We investigated the effects of tumor necrosis factor
Asbestos fibers and silica particles stimulate rat alveolar macrophages to release tumor necrosis factor. Autoregulatory role of leukotriene B4.
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Alveolar macrophages (AM) can play a crucial role in the pathogenesis of pulmonary disease via their ability to produce potent inflammatory and fibrogenic mediators. We found that rat AM cultured with 1 to 100 micrograms/ml of silica particles or asbestos fibers produced tumor necrosis factor (TNF)
Tumor necrosis factor-alpha induces interleukin-6 mRNA and protein in human granulosa luteinizing cells via protein tyrosine kinase without involving ceramide.
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This study examines how interleukin-6 (IL-6) expression by human luteinizing granulosa cells is regulated. IL-6 was assayed in culture supernatants, mRNA in cells by in situ hybridization and by a competitive reverse-transcriptase polymerase chain reaction (RT-PCR). TNF alpha (100 pg-1 ng/ml)
Abscisic acid is involved in chitosan-induced resistance to tobacco necrosis virus (TNV).
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Chitosan (CHT) antiviral activity has been further investigated in the pathosystem Phaseolus vulgaris - tobacco necrosis virus (TNV). CHT application elicited both callose apposition and ABA accumulation in leaf tissues, at 12 and 24h after treatment, respectively, and induced a high level of
Alteration in inflammatory/apoptotic pathway and histone modifications by nordihydroguaiaretic acid prevents acute pancreatitis in swiss albino mice.
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Reactive oxygen radicals, pro-inflammatory mediators and cytokines have been implicated in caerulein induced acute pancreatitis. Nordihydroguaiaretic acid (NDGA), a plant lignin, has marked anti-inflammatory properties. The present study aimed to investigate the possible protective effect of NDGA
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
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