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An experimental study on O-[18F]fluoromethyl-L-tyrosine for differentiation between tumor and inflammatory tissues.
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OBJECTIVE
O-[18F]fluoromethyl-L-tyrosine (18F-FMT) is a recently developed tumor-detecting agent with simple preparation and high radiochemical yields. The aim of this study was to assess the potency of 18F-FMT for differentiating tumor and inflammatory tissues using an animal model with an
Effects of omega-3 fatty acids supplementation on inflammatory parameters after chronic administration of L-tyrosine.
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Tyrosinemia type II is an autosomal recessive inborn error of metabolism caused by hepatic cytosolic tyrosine aminotransferase deficiency. Importantly, this disease is associated with neurological and developmental abnormalities in many patients. Considering that the mechanisms underlying
O-(2-[(18)F]Fluoroethyl)- L-tyrosine (FET): a tracer for differentiation of tumour from inflammation in murine lymph nodes.
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High uptake of [(18)F]fluoro-2-deoxy- D-glucose (FDG) by inflammatory cells is a frequent cause of false positive results in lymph node (LN) staging by positron emission tomography. Previous studies suggest that radiolabelled amino acids may be more specific markers for viable tumour tissue than
AIDS-Related Central Nervous System Toxoplasmosis With Increased 18F-Fluoroethyl-L-Tyrosine Amino Acid PET Uptake Due to LAT1/2 Expression of Inflammatory Cells.
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We report the case of a 40-year-old woman with a progressive right-sided hemiparesis. Standard MRI revealed a contrast-enhancing brain lesion within the left basal ganglia. Ffluoroethyl-L-tyrosine (F-FET) PET showed a distinct tracer uptake (lesion-to-brain ratio [LBR]: LBRmax = 2.03, LBRmean =
Differentiation of tumour and inflammation: characterisation of [methyl-3H]methionine (MET) and O-(2-[18F]fluoroethyl)-L-tyrosine (FET) uptake in human tumour and inflammatory cells.
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OBJECTIVE
Previous studies suggest that radiolabelled amino acids could be superior to FDG in differentiating tumour and inflammation. Therefore the aim of this study was to investigate the uptake of FET and MET in human tumour and inflammatory cells and to investigate their uptake
O-(2-[18F]fluorethyl)-L-tyrosine PET in the clinical evaluation of primary brain tumours.
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OBJECTIVE
The aim of this study was to evaluate the differential uptake of O-(2-[18F]fluorethyl)-L-tyrosine (FET) in suspected primary brain tumours.
METHODS
Positron emission tomography (PET) was performed in 44 patients referred for the evaluation of a suspected brain tumour. Acquisition consisted
Prognostic value of 18F-fluoroethyl-L-tyrosine PET and MRI in small nonspecific incidental brain lesions.
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Nonspecific incidental brain lesions (NILs) are being detected more frequently because of an increasing number of screening or research MRI scans of the brain, and their natural course is uncertain.
METHODS
In a prospective cohort study starting in 1999, we determined the outcomes of patients with
New steroidal anti-inflammatory antedrugs: methyl 21-desoxy-21-chloro-11beta,17alpha-dihydroxy-3,20-dioxo-1, 4-pregnadiene-16alpha-carboxylate, methyl 21-desoxy-21-chloro-11beta-hydroxy-3,20-dioxo-1, 4-pregnadiene-16alpha-carboxylate, and their 9alpha-fluoro derivatives*.
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To a series of 21-desoxy-21-chloro-corticosteroids, a metabolically labile methoxycarbonyl group at C-16 has been incorporated. The approach is to synthesize locally active compounds that are hydrolyzed to inactive and readily excretable acid metabolites upon entry into the systemic circulation.
New steroidal anti-inflammatory antedrugs: methyl 3,20-dioxo-9 alpha-fluoro-11 beta,17 alpha,21-trihydroxy-1,4-pregnadiene-16 alpha-carboxylate and methyl 21-acetyloxy-3,20-dioxo-11 beta, 17 alpha-dihydroxy-9 alpha-fluoro-1,4-pregnadiene-16 alpha-carboxylate.
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Focused efforts have been made to increase local-to-systemic activity ratios of potent anti-inflammatory steroids for local and/or topical applications. The approach taken in the present investigation is based upon the concept of "antedrug," defined as a locally active compound that exerts its
Uptake of 18F-fluorocholine, 18F-fluoroethyl-L-tyrosine, and 18F-FDG in acute cerebral radiation injury in the rat: implications for separation of radiation necrosis from tumor recurrence.
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Differentiation between posttherapy radiation necrosis and recurrent tumor in humans with brain tumor is still a difficult diagnostic task. The new PET tracers (18)F-fluoro-ethyl-l-tyrosine (FET) and (18)F-fluorocholine (N,N-dimethyl-N-(18)F-fluoromethyl-2-hydroxyethylammonium [FCH]) have shown
The peroxynitrite product 3-nitro-L-tyrosine attenuates the hemodynamic responses to angiotensin II in vivo.
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Peroxynitrite is a potent oxidant formed endogenously by the near diffusion-limited reaction of nitric oxide with superoxide anion. Peroxynitrite specifically adds a nitro group to the ortho position of the phenolic ring of free and protein-associated tyrosines to form the stable product
Synthesis, kinetic studies and pharmacological evaluation of mutual azo prodrug of 5-aminosalicylic acid for colon-specific drug delivery in inflammatory bowel disease.
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Mutual azo prodrug of 5-aminosalicylic acid with l-tyrosine was synthesized by coupling l-tyrosine with salicylic acid, for targeted drug delivery to the inflamed gut tissue in inflammatory bowel disease. The structure was confirmed by elemental analysis, IR and NMR spectroscopy. In vitro kinetic
Pharmacological profile of CR3465, a new leukotriene CysLT1 receptor antagonist with broad anti-inflammatory activity.
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CR3465 (L-Tyrosine, N-[(2-quinolinyl)carbonyl]-O-(7-fluoro-2-quinolinylmethyl) sodium salt) is a potent antagonist of [3H]leukotriene D4 ([3H]LTD4) binding to guinea pig lung preparations, its Ki (4.7+/-0.7 nM) being comparable with that of montelukast (5.6+/-0.6 nM). In tracheal strips from
Ameliorative effects of GW1929, a nonthiazolidinedione PPARγ agonist, on inflammation and apoptosis in focal cerebral ischemic-reperfusion injury.
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PPARγ agonist; 2-(Benzoylphenyl)-O-[2-(methyl-2-pyridinylamino) ethyl]-L-tyrosine (GW1929) in focal cerebral ischemic-reperfusion (IR) injury in rats. Focal cerebral IR injury resulted significant brain infarction and neurological deficits in rats. A significant increase in various inflammatory
Myeloperoxidase scavenges peroxynitrite: A novel anti-inflammatory action of the heme enzyme.
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Peroxynitrite, a potent pro-inflammatory and cytotoxic species, interacts with a variety of heme containing proteins. We addressed the question whether (i) the interaction of myeloperoxidase (MPO, an enzyme generating hypochlorous acid from hydrogen peroxide and chloride ions) with peroxynitrite
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