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TH01, a tetrameric short tandem repeat locus in the tyrosine hydroxylase gene: association with myocardial hypertrophy and death from myocardial infarction?

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TH01 is a tetrameric short tandem repeat locus located in intron 01 of the tyrosine hydroxylase gene. The tyrosine hydroxylase catalyzes the hydroxylation of L-tyrosine to L-DOPA and is the rate limiting enzyme in the synthesis of catecholamines like noradrenaline or adrenaline, which are pivotal in

Peroxynitrite formation in focal cerebral ischemia-reperfusion in rats occurs predominantly in the peri-infarct region.

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Peroxynitrite (ONOO-) exhibits potent neurotoxicity and plays an important role in neuronal death, but no evidence shows that it is formed in the brain during ischemia or subsequent reperfusion. To detect the formation of ONOO-, we used a hydrolysis/HPLC procedure to measure the formation of

Uptake of O-(2-[18F]fluoroethyl)-L-tyrosine in reactive astrocytosis in the vicinity of cerebral gliomas.

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PET using O-(2-[(18)F]fluoroethyl)-L-tyrosine ((18)F-FET) allows improved imaging of tumor extent of cerebral gliomas in comparison to MRI. In experimental brain infarction and hematoma, an unspecific accumulation of (18)F-FET has been detected in the area of reactive astrogliosis which is a common

Neuroprotective action of halogenated derivatives of L-phenylalanine.

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OBJECTIVE The aromatic amino acid L-Phenylalanine (L-Phe) significantly and reversibly depresses excitatory glutamatergic synaptic transmission (GST) via a unique set of presynaptic and postsynaptic mechanisms. Therefore, we hypothesized that endogenous derivatives of L-Phe, which display potent

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

[Peroxynitrite production in cerebral ischemia].

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Peroxynitrite, generated by the reaction of nitric oxide and superoxide, has toxic effects including oxidation of sulfhydryls, lipid peroxidation and nitration of amino acid residues. So far peroxynitrite has not yet been detected in the ischemic brain because of its short half-life. Recently, we

Anesthetic preconditioning: triggering role of reactive oxygen and nitrogen species in isolated hearts.

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We postulated that anesthetic preconditioning (APC) is triggered by reactive oxygen/nitrogen species (ROS/RNS). We used the isolated guinea pig heart perfused with L-tyrosine, which reacts with ROS and RNS to form strong oxidants, principally peroxynitrite (ONOO(-)), and then forms fluorescent

Oxidized LDL and coronary heart disease.

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During inflammation, several cell types synthesize and secrete phospholipase A2 that catalyses lipid oxidation in LDL. Myeloperoxidase, a haeme protein secreted by activated phagocytes, oxidizes L-tyrosine to a tyrosyl radical that is a physiological catalyst for the initiation of lipid oxidation in

Suppression of oxidative neuronal damage after transient middle cerebral artery occlusion in mice lacking interleukin-1.

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Interleukin-1 (IL-1) contributes to ischemic neurodegeneration. However, the mechanisms regulating action of IL-1 are still poorly understood. In order to clear this central issue, mice that were gene deficient in IL-1alpha and beta (IL-1 KO) and wild-type mice were subjected to 1-h transient middle

The Effects of Memantine on Glutamic Receptor-Associated Nitrosative Stress in a Traumatic Brain Injury Rat Model.

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BACKGROUND The main aim of this study is to elucidate whether the neuroprotective effect of memantine, a noncompetitive N-methyl-d-aspartate receptor 2B (NR2B) antagonist, affects neuronal nitrosative stress, apoptosis, and NR2B expression and improves functional outcomes. METHODS Immediately after

Differential uptake of [18F]FET and [3H]l-methionine in focal cortical ischemia.

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Amino acids such as [(11)C-methyl]l-methionine are particularly useful in brain tumor diagnosis, but unspecific uptake (e.g., in cerebral ischemia) has been reported. O-(2-[(18)F]fluoroethyl)-l-tyrosine ([(18)F]FET) shows a clinical potential similar to that of l-methionine (MET) in brain tumor

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