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Detection of free radicals by isolated perfusion of the rat brain following hemorrhagic stroke: a novel approach to cerebrovascular biomarker research.

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Blood-borne biomarkers are a mainstay of diagnosis and follow-up in many diseases. For stroke, however, no reliable biomarkers have thus far been identified. To remedy this situation, we investigated the usefulness of a modified in situ isolated brain perfusion (IBP) technique for screening

Hydroxyl radical formation is greater in striatal core than in penumbra in a rat model of ischemic stroke.

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Although hydroxyl radical ((*)OH) formation has been implicated in the pathophysiological changes of ischemic stroke, (*)OH production in the core and penumbra regions is not clear. It is extremely important to distinguish penumbra from ischemic core in focal cerebral ischemia studies, because the

Increased hydroxyl radicals in the hippocampus of stroke-prone spontaneously hypertensive rats during transient ischemia and recirculation.

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It has been suggested that stroke-prone spontaneously hypertensive rats (SHRSP) show vulnerability to neuronal damage following transient ischemia. To observe the effect of hydroxyl radicals on neuronal damage in the hippocampus of SHRSP during ischemia and recirculation, we measured the levels of

Attenuating brain inflammation, ischemia, and oxidative damage by hyperbaric oxygen in diabetic rats after heat stroke.

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OBJECTIVE Alternating hypothalamic-pituitary-adrenal axis mechanisms would lead to multiple organs dysfunction or failure. Herein, we attempt to assess whether hypothalamic inflammation and ischemic and oxidative damage that occurred during heatstroke (HS) can be affected by hyperbaric oxygen (HBO₂)

Accumulation of amino acids and hydroxyl free radicals in brain and retina of gerbil after transient ischemia.

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The mongolian gerbil was introduced as a stroke model because of its incomplete circle of Willis. Unilateral carotid ligation ischemia produced in such a fashion was not effective in all gerbils. We have selected gerbils by examination of the ocular fundus to study the level of amino acids and

Prolyl hydroxylase inhibitors depend on extracellular glucose and hypoxia-inducible factor (HIF)-2alpha to inhibit cell death caused by nerve growth factor (NGF) deprivation: evidence that HIF-2alpha has a role in NGF-promoted survival of sympathetic neurons.

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Neurotrophins are critical for the survival of neurons during development and insufficient access to neurotrophins later in life may contribute to the loss of neurons in neurodegenerative disease, spinal cord injury, and stroke. The prolyl hydroxylase inhibitors ethyl 3,4-dihydroxybenzoic acid (DHB)

Activation of catechol-O-methyltransferase in astrocytes stimulates homocysteine synthesis and export to neurons.

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Elevation of the total homocysteine (tHcy) concentration in plasma has been implicated in neurodegeneration in patients with stroke, dementia, Alzheimer disease, and Parkinson disease. Because the mechanisms controlling brain tHcy are unknown, the present study investigated its synthesis and

Production of reactive oxygen species after reperfusion in vitro and in vivo: protective effect of nitric oxide.

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OBJECTIVE Thrombolytic treatments for ischemic stroke can restore circulation, but reperfusion injury, mediated by oxygen free radicals, can limit their utility. The authors hypothesized that, during reperfusion, nitric oxide (NO) provides cytoprotection against oxygen free radical

A probable dual mode of action for both L- and D-lactate neuroprotection in cerebral ischemia.

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Lactate has been shown to offer neuroprotection in several pathologic conditions. This beneficial effect has been attributed to its use as an alternative energy substrate. However, recent description of the expression of the HCA1 receptor for lactate in the central nervous system calls for

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

Citicoline decreases phospholipase A2 stimulation and hydroxyl radical generation in transient cerebral ischemia.

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Neuroprotection by citicoline (CDP-choline) in transient cerebral ischemia has been demonstrated previously. Citicoline has undergone several Phase III clinical trials for stroke, and is being evaluated for treatment of Alzheimer's and Parkinson's diseases. Phospholipid degradation and generation of

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