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2 5 dihydroxybenzoic acid/infarkt
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Pravastatin reduces myocardial infarct size via increasing protein kinase C-dependent nitric oxide, decreasing oxyradicals and opening the mitochondrial adenosine triphosphate-sensitive potassium channels in rabbits.
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BACKGROUND
Statins reportedly protect against myocardial infarction, but the precise mechanism is unclear.
RESULTS
Rabbits underwent 30 min of coronary occlusion followed by 48 h of reperfusion. Pravastatin (1 or 5 mg/kg) or saline was intravenously administered 10 min before ischemia. Pravastatin
Demonstration of the formation of hydroxyl radicals in acute myocardial infarction in man using salicylate as probe.
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Dihydroxybenzoic acid (DHBA) derivatives of acetylsalicylic acid (ASA) are formed in vivo by the action of the hydroxyl radical (OH.). In order to evaluate the possible formation of OH(.) in acute myocardial infarction (AMI) in man, 9 consecutive patients with a first episode of AMI (8 males, 1
Quinaprilat reduces myocardial infarct size involving nitric oxide production and mitochondrial KATP channel in rabbits.
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This study examined whether quinaprilat, an angiotensin-converting enzyme inhibitor, reduces the infarct size, and investigated the mechanisms for its infarct size-reducing effect, in rabbits. Japanese white rabbits underwent 30 min of ischemia and 48 h of reperfusion. Quinaprilat (100 microg/kg/h
Edaravone reduces myocardial infarct size and improves cardiac function and remodelling in rabbits.
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1. In the present study, we investigated the effect of 3-methyl-1-phenyl-2-pyrazolin-5-one (edaravone), a free radical scavenger, on myocardial infarct (MI) size and cardiac function in an in vivo model of MI in rabbits. We further investigated the contribution of hydroxyl radicals, superoxide and
Acarbose reduces myocardial infarct size by preventing postprandial hyperglycemia and hydroxyl radical production and opening mitochondrial KATP channels in rabbits.
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BACKGROUND
Acarbose, an antidiabetic drug, is an alpha-glucosidase inhibitor that can inhibit glucose absorption in the intestine. A recent large-scale clinical trial, STOP-NIDDM, showed that acarbose reduces the risk of myocardial infarction. We examined whether acarbose reduces myocardial infarct
Hydroxyl radical generation, levels of tumor necrosis factor-alpha, and progression to heart failure after acute myocardial infarction.
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OBJECTIVE
We used acetylsalicylic acid (ASA) as a probing agent to quantify hydroxyl radical ((*)OH) in Controls and patients with coronary artery disease and to prospectively investigate (*)OH production in patients with myocardial infarction (MI) complicated by heart failure
Effects of nitric oxide on reactive oxygen species production and infarction size after brain reperfusion injury.
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OBJECTIVE
Deleterious effects of strokes may be ameliorated when thrombolysis (i.e., with recombinant tissue plasminogen activator) restores circulation. However, reperfusion injury, mediated by oxygen free radicals (reactive oxygen species [ROS]), may limit the benefits of recombinant tissue
Reducing hemoglobin oxygen affinity does not increase hydroxyl radicals after acute subdural hematoma in the rat.
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Extensive evidence is available to show the importance of ischemia after severe human head injury. We have previously shown that pharmacologically increasing the release of oxygen in brain tissue where the local oxygen pressure is low reduces infarct size in animal models. To study the possible
Stable nitroxide Tempol ameliorates brain injury by inhibiting lipid peroxidation in a rat model of transient focal cerebral ischemia.
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Oxygen free radicals have been implicated in the pathogenesis of cerebral ischemia and reperfusion injury. 4-Hydroxy-2,2,6,6-tetramethylpiperidene-1-oxyl (Tempol) has been reported as a stable nitroxide and a membrane-permeable free radical scavenger. This study was performed to investigate the
Ischemic preconditioning decreases the reperfusion-related formation of hydroxyl radicals in a rabbit model of regional myocardial ischemia and reperfusion: the role of K(ATP) channels.
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The objective of this study was to assess the effects of ischemic preconditioning (IP) on hydroxyl free radical production in an in vivo rabbit model of regional ischemia and reperfusion. Another goal was to determine whether K(ATP) channels are involved in these effects. The hearts of anesthetized
Protection of ischemic and reperfused rat myocardium by the nonglucocorticoid 21-aminosteroid U-74389G, a new inhibitor of lipid peroxidation.
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We studied the effects of the aminosteroid U-74389G (21-[4-(2, 6-di-1-pyrrolidinyl-4-pyrimidinyl)-1-piperazinyl]-pregna-1,4,9(11)- triene-3,20-dione(2)-2-butenenedionate), a putative inhibitor of lipid peroxidation, which protects the rat myocardium after ischemia and reperfusion.
The effect of alpha-phenyl-tert-butyl nitrone (PBN) on free radical formation in transient focal ischaemia measured by microdialysis and 3,4-dihydroxybenzoate formation.
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alpha-phenyl-tert-butyl nitrone (PBN) reduces infarct size, improves recovery of brain energy metabolism and delays the secondary increase in extracellular potassium after focal ischaemia, presumably by trapping OH radicals. We investigated the effect of PBN on the formation of 3,4-dihydroxybenzoic
In vivo hepatocyte growth factor gene transfer reduces myocardial ischemia-reperfusion injury through its multiple actions.
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BACKGROUND
Hepatocyte growth factor (HGF) is reported to protect the heart against ischemia-reperfusion injury. However, whether in vivo adenovirus-mediated HGF gene transfer before ischemia is protective against ischemia-reperfusion and its precise mechanisms are still unknown.
RESULTS
By using a
AM-36, a novel neuroprotective agent, profoundly reduces reactive oxygen species formation and dopamine release in the striatum of conscious rats after endothelin-1-induced middle cerebral artery occlusion.
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Elevated generation of reactive oxygen species (ROS) has been demonstrated during ischemia and reperfusion. Dopamine (DA) autooxidation may contribute to increased ROS generation. The novel neuroprotective agent AM-36 has antioxidant and Na(+) channel blocking activity and reduces neuronal damage in
Role of reactive oxygen species in the sensitivity of rat hypertrophied myocardium to ischemia.
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The relationship between hydroxyl radical (OH*) generation in the zone of ischemia/reperfusion and the size of infarction formed was investigated in 18-22-week-old anaesthetized male SHRSP and Wistar rats using a myocardial microdialysis technique. The marker of OH* generation, 2,3-dihydroxybenzoic
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