pterin/inflamação

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Induction of pterin synthesis is not required for cytokine-stimulated tryptophan metabolism.

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Activation of the immune system which occurs in inflammatory disease leads to parallel increases in pterin synthesis and increased production of neuroactive L-tryptophan metabolites. Several model systems were studied to determine whether pterins, which are cofactors for hydroxylation reactions,

Determination of Urinary Pterins by Capillary Electrophoresis Coupled with LED-Induced Fluorescence Detector.

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Urinary pterins have been found as potential biomarkers in many pathophysiological conditions including inflammation, viral infections, and cancer. However, pterins determination in biological samples is difficult due to their degradation under exposure to air, light, and heat. Besides, they occur

Impact-induced muscle damage and urinary pterins in professional rugby: 7,8-dihydroneopterin oxidation by myoglobin.

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Muscle damage caused through impacts in rugby union is known to increase oxidative stress and inflammation. Pterins have been used clinically as markers of oxidative stress, inflammation, and neurotransmitter synthesis. This study investigates the release of myoglobin from muscle tissue due to

Structural basis for pterin antagonism in nitric-oxide synthase. Development of novel 4-oxo-pteridine antagonists of (6R)-5,6,7,8-tetrahydrobiopterin.

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Pathological nitric oxide (NO) generation in sepsis, inflammation, and stroke may be therapeutically controlled by inhibiting NO synthases (NOS). Here we targeted the (6R)-5,6,7,8-tetrahydro-l-biopterin (H(4)Bip)-binding site of NOS, which, upon cofactor binding, maximally increases enzyme activity

Cytokine and IDO metabolite changes effected by calcium pterin during inhibition of MDA-MB-231 xenograph tumors in nude mice.

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In vivo studies of the effectiveness of various forms of calcium pterin reveal significant antitumor activity associated with (1:4, mol/mol) calcium pterin (CaPterin), (1:2, mol/mol) calcium pterin, dipterinyl calcium pentahydrate (DCP), as well as unexpectedly for a calcium chloride dihydrate

Calcium-pterin suppresses mitogen-induced tryptophan degradation and neopterin production in peripheral blood mononuclear cells.

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Antitumor activity of a calcium-pterin suspension has been described in vitro and in animal model systems. Recent studies provide some evidence that this effect involves immune-mediated mechanisms. We investigated the influence of calcium-pterin on freshly isolated human peripheral blood mononuclear

Exercise-induced immune system response: Anti-inflammatory status on peripheral and central organs.

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A wide array of molecular pathways has been investigated during the past decade in order to understand the mechanisms by which the practice of physical exercise promotes neuroprotection and reduces the risk of developing communicable and non-communicable chronic diseases. While a single session of

Protein and thiol oxidation in cells exposed to peroxyl radicals is inhibited by the macrophage synthesised pterin 7,8-dihydroneopterin.

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Monocyte cells are exposed to a range of reactive oxygen species (ROS) when they are recruited to a site of inflammation. In this study, we have examined the damage caused to the monocyte-like cell line U937 by peroxyl radicals and characterised the protective effect of the macrophage synthesised

Stimulus-dependent production of cytokines and pterins by peripheral blood mononuclear cells.

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The cytokine profiles produced by peripheral blood mononuclear cell (PBMC) cultures were dependent upon the nature of the stimulus used. Powerful lymphocyte activators such as mitogens induced rapid cell proliferation together with the production of both inflammatory (IL-1 alpha, IL-1 beta, IL-6 and

OxLDL induced cell death is inhibited by the macrophage synthesised pterin, 7,8-dihydroneopterin, in U937 cells but not THP-1 cells.

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The atherosclerotic plaque is an inflammatory site where macrophage cells are exposed to cytotoxic oxidised low density lipoprotein (oxLDL). Interferon-gamma released from T-cells results in macrophage synthesis of 7,8-dihydroneopterin which has antioxidant and cytoprotective activity. Using the

Cerebral arterial stenoses and stroke: novel features of Aicardi-Goutières syndrome caused by the Arg164X mutation in SAMHD1 are associated with altered cytokine expression.

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Aicardi-Goutières syndrome (AGS) is a rare inborn multisystemic disease, resembling intrauterine viral infection and resulting in psychomotor retardation, spasticity and chilblain-likeskin lesions. Diagnostic criteria include intracerebral calcifications and elevated interferon-alpha and pterin

Cerebrospinal fluid neopterin and cryopyrin-associated periodic syndrome.

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Cryopyrin-associated periodic syndrome is a category of autoinflammatory disorders caused by mutations of the NLRP3 gene, with chronic infantile neurologic cutaneous and articular syndrome being the severest clinical phenotype. Various pterins have been reported as mediating immunologic functions in

Sulfamethoxazole drug stress upregulates antioxidant immunomodulatory metabolites in Escherichia coli

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Escherichia coli is an important model organism in microbiology and a prominent member of the human microbiota¹. Environmental isolates readily colonize the gastrointestinal tract of humans and other animals, and they can serve diverse probiotic, commensal and pathogenic roles in the

Biology and chemistry of the inhibition of nitric oxide synthases by pteridine-derivatives as therapeutic agents.

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Inhibitors of the family of nitric oxide synthases (NOS-I-III; EC 1.14.13.39) are of interest as pharmacological agents to modulate pathologically high nitric oxide (NO) levels in inflammation, sepsis, and stroke. In this article, we discuss the approach for targeting the unique

Correlation of interleukin-2 receptor and neopterin secretion in rheumatoid arthritis.

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In rheumatoid arthritis (RA) an immuno dysregulation alters the release of neopterin from human monocytes/macrophages, probably by activation of a feed-back regulation mechanism in pterin metabolism. With the overactivation of T-lymphocytes, the secretion of interleukin-2 and its receptor (IL-2R) is

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