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l tryptophan/nécrose
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Dynamic physiological and molecular changes in gastric ulcer healing achieved by melatonin and its precursor L-tryptophan in rats.
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Following induction of gastric ulcer in rats by serosal application of acetic acid, local mucosal necrosis ensues accompanied by a reduction in mucosal microcirculation and by almost immediate expression of inducible nitric oxide (NO) synthase (iNOS) and proinflammatory cytokines. Daily application
Inhibition of chlamydia trachomatis growth by human interferon-alpha: mechanisms and synergistic effect with interferon-gamma and tumor necrosis factor-alpha.
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We have evaluated the effect of natural human interferon (IFN)-alpha on the growth of chlamydia trachomatis in human epithelial cells in vitro and revealed that IFN-alpha has reduced both growth and infectivity of C. trachomatis. The effect of IFN-alpha was reversed by the addition of exogenous
Anti-parasitic effector mechanisms in human brain tumor cells: role of interferon-gamma and tumor necrosis factor-alpha.
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Toxoplasma gondii, an obligate intracellular parasite, is able to replicate in human brain cells. We recently showed that interferon (IFN)-gamma-activated cells from glioblastoma line 86HG39 were able to restrict Toxoplasma growth. The effector mechanism responsible for this toxoplasmostatic effect
Tryptophan protects human melanoma cells against gamma-interferon and tumour necrosis factor-alpha: a unifying mechanism of action.
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The sensitivity and resistance of six human melanoma cell lines to gamma-interferon (gamma-IFN) and tumour necrosis factor-alpha (TNF-alpha) have been examined. Amelanotic cell lines were more sensitive to gamma-IFN and TNF-alpha than melanotic cells. The cytotoxicity of gamma-IFN and TNF-alpha
Eosinophilia-myalgia syndrome associated with L-tryptophan use.
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The eosinophilia-myalgia syndrome associated with the use of oral preparations of the amino acid L-tryptophan was recognized in late 1989. We describe the clinical and laboratory manifestations, pathological findings and early clinical course of 20 patients with the eosinophilia-myalgia syndrome.
Synergistic transcriptional activation of indoleamine dioxygenase by IFN-gamma and tumor necrosis factor-alpha.
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Interferon-gamma (IFN-gamma)-induced indoleamine 2,3-dioxygenase (IDO) activity inhibits the growth of susceptible intracellular pathogens by catalyzing the oxidative cleavage of the indole ring of L-tryptophan and depleting pools of the essential amino acid. Tumor necrosis factor-alpha (TNF-alpha)
l-Tryptophan exhibits therapeutic function in a porcine model of dextran sodium sulfate (DSS)-induced colitis.
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Conventional therapies for the treatment of inflammatory bowel disease (IBD) have demonstrated limited efficacy and potential toxicity; therefore, there is a need for novel therapies that can safely and effectively treat IBD. Recent evidence has indicated that amino acids may play a role in
3-Hydroxyanthranilic acid, one of L-tryptophan metabolites, inhibits monocyte chemoattractant protein-1 secretion and vascular cell adhesion molecule-1 expression via heme oxygenase-1 induction in human umbilical vein endothelial cells.
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Heme oxygenase (HO)-1 is important in the vascular system, and its genetic or pharmacological induction in endothelium would be effective for the prevention and treatment of atherosclerosis. The naturally occurring antioxidant 3-hydroxyanthranilic acid (HA), one of l-tryptophan metabolites formed in
Protective effect of melatonin and its precursor L-tryptophan on acute pancreatitis induced by caerulein overstimulation or ischemia/reperfusion.
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Melatonin, a pineal secretory product, synthesized from l-tryptophan, has received increased attention because of its antioxidative and immunomodulatory properties. It has been detected in the gut and shown to protect the gastric mucosa, and liver from acute damage, but the role of melatonin in the
Haemophilus ducreyi lipooligosaccharides induce expression of the immunosuppressive enzyme indoleamine 2,3-dioxygenase via type I interferons and tumor necrosis factor alpha in human dendritic cells.
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Haemophilus ducreyi causes chancroid, a genital ulcer disease. In human inoculation experiments, most volunteers fail to clear the bacteria despite the infiltration of innate and adaptive immune cells to the infected sites. The immunosuppressive protein indoleamine 2,3-dioxygenase (IDO) is a
Inhibition of human herpes simplex virus type 2 by interferon gamma and tumor necrosis factor alpha is mediated by indoleamine 2,3-dioxygenase.
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Genital herpes simplex virus type 2 (HSV-2) is a significant clinical problem. Infection in pregnancy may result in disseminated infection of the newborn with encephalitis. We analyzed the antiviral effects induced by interferon-gamma (IFN-gamma) and tumor necrosis factor alpha (TNF-alpha) in cervix
Stressors Due to Handling Impair Gut Immunity in Meagre (Argyrosomus regius): The Compensatory Role of Dietary L-Tryptophan.
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In the context of intensive aquaculture, meagre (Argyrosomus regius) is one of the most important new aquaculture species in Southern Europe and several studies are focused on the optimization of its culture. Nevertheless, stressors such as handling during transport or culture maintenance may
ADAM-17/tumor necrosis factor-α-converting enzyme inhibits neurogenesis and promotes gliogenesis from neural stem cells.
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Neural precursor cells (NPCs) are activated in central nervous system injury. However, despite being multipotential, their progeny differentiates into astrocytes rather than neurons in situ. We have investigated the role of epidermal growth factor receptor (EGFR) in the generation of non-neurogenic
Effects of surplus dietary L-tryptophan on stress, immunology, behavior, and nitrogen retention in endotoxemic pigs.
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The possible beneficial effects of surplus dietary Trp (+5 g of Trp/kg of diet) on factors related to stress, immunology, behavior, and N retention were investigated in postweaning piglets (approximately 15 kg of BW) challenged for 10 d with intravenous bacterial lipopolysaccharide (from Escherichia
Flavivirus infection induces indoleamine 2,3-dioxygenase in human monocyte-derived macrophages via tumor necrosis factor and NF-κB.
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Infection with West Nile virus (WNV) via a mosquito bite results in local viral replication in the skin, followed by viremia. Thus, tissue macrophages are ideally located to prevent the dissemination of WNV throughout the host. The current study shows that WNV infection of human monocyte-derived
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