BACKGROUND AND PURPOSE Apoptotic-like pathways may contribute to brain cell death after intracerebral hemorrhage. In this study, we used a simplified in vitro model of hemoglobin neurotoxicity to map the caspase cascades involved and to document the role of oxidative stress. METHODS Primary neuronal cultures were obtained from rat cerebral cortex and exposed to hemoglobin to induce cell death...

The phenolic compounds and the organic acids composition of the edible beefsteak fungus Fistulina hepatica was determined by HPLC/DAD and HPLC/UV, respectively. The results showed a profile composed by five phenolic compounds (caffeic, p-coumaric and ellagic acids, hyperoside and quercetin) and six organic acids (oxalic, aconitic, citric, malic, ascorbic and fumaric acids). The quantification o...

It has been hypothesized that hyperthermia promotes oxygen-centered free radical formation in cells; however, to date there is no direct evidence of this heat-induced increase in oxygen free radical flux. Using electron paramagnetic resonance (EPR) spin trapping, we sought direct evidence for free radical generation during hyperthermia in intact, functioning cells. Rat intestinal epithelial cel...

background: alpinia galanga l. belonging to the family zingiberaceae is widely grown in the state of kerala, india. they are effective antioxidant and free radical scavenger under both in vitro and in vivo condition. the efficacy of the isolated flavonoids in conferring protection from radiation induced damages to genomic dna was studied. materials and methods: the bioflavonoids, galangin and k...

Free Radicals and Ocular Disease p. 73 Active Oxygen Mechanisms of UV Inflammation p. 87 Oxygen-Free Radicals at Myocardial Level: Effects of Ischaemia and Reperfusion p. 99 Mechanisms of Atherosclerosis: Role of LDL Oxidation p. 113 Tissue Iron Overload and Mechanisms of Iron-Catalyzed Oxidative Injury p. 129 Free Radicals in the Pathophysiology of Pulmonary Injury and Disease p. 147 Lipid Per...

Lipoxygenases have been proposed to be a possible factor that is responsible for the pathology of certain diseases, including ischaemic injury. In the peroxidation process of linoleic acid by lipoxygenase, the E,Z-linoleate allyl radical-lipoxygenase complex seems to be generated as an intermediate. In the present study, we evaluated whether E,Z-linoleate allyl radicals on the enzyme are scaven...

The potential role of oxygen free radicals in hCG-induced ovulation was investigated using the free radical scavenging enzymes superoxide dismutase (SOD) and/or catalase with the in-vitro perfused rabbit ovary preparation. SOD (25 \g=m\g/ml) and SOD + catalase (25 \g=m\g/ml)significantly reduced the % of large follicles that ovulated during perfusion (P < 0\m=.\005).Neither maturity nor degener...

Based on recent studies, it has been suggested that free radicals are elaborated in the respiratory muscles during strenuous contractions and contribute to the development of muscle fatigue. If this theory is correct, then it should be possible to attenuate the development of diaphragm fatigue and/or delay the onset of respiratory failure during loaded breathing by administering a free radical ...

Reactive oxygen species (ROS) play a vital role in brain damage after cerebral ischemia-reperfusion injury, and ROS scavengers have been shown to exert neuroprotective effects against ischemic brain injury. We have recently identified 8-(4-fluorophenyl)-2-((2E)-3-phenyl-2-propenoyl)-1,2,3,4-tetrahydropyrazolo[5,1-c][1,2,4]triazine (FR210575) as a novel, powerful free-radical scavenger. In the p...

Phenolphthalein, a widely used laxative, is the active ingredient in more than a dozen commercial nonprescription formulations. Fast-flow EPR studies of the reaction of phenolphthalein with horseradish peroxidase (HRP) and hydrogen peroxide permit the direct detection of two free radicals. One has EPR parameters characteristic of phenoxyl radicals. The other has a broad unresolved spectrum, pos...