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Pàgina 1 des de 251 resultats
[Pulmonary apoptosis and necrosis in hyperoxia-induced acute mouse lung injury].
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OBJECTIVE
To investigate the pathways to cell death in hyperoxia-induced lung injury and the functional significance of apoptosis in vivo in response to hyperoxia.
METHODS
Seventy-two mice were exposed in sealed cages > 98% oxygen (for 24 - 72 h) or room air, and the severity of lung injury and
Preconditioning with sublethal ischemia or intermittent normobaric hyperoxia up-regulates glutamate transporters and tumor necrosis factor-alpha converting enzyme in the rat brain.
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BACKGROUND
Recent studies suggest that sublethal ischemia and intermittent normobaric hyperoxia (InHO) protect the brain from subsequent ischemic injury. In this, changes in the expression of excitatory amino-acid transporters (EAATs) and tumor necrosis factor-alpha converting enzyme (TACE) may play
Hyperoxia prolongs tumor necrosis factor-alpha-mediated activation of NF-kappaB: role of IkappaB kinase.
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Hyperoxia and tumor necrosis factor-alpha (TNFalpha) are two canonical signals centrally involved in the pathophysiology of acute lung injury. We have attempted to elucidate the effects of these two stimuli on the signal transduction pathways of lung parenchymal cells. In cultured human lung
In vivo preconditioning with normobaric hyperoxia induces ischemic tolerance partly by triggering tumor necrosis factor-alpha converting enzyme/tumor necrosis factor-alpha/nuclear factor-kappaB.
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Recent studies suggest that intermittent and prolonged normobaric hyperoxia (HO) results in brain ischemic tolerance (BIT), reducing ischemic brain injury. We have attempted to determine the time course of HO-induced BIT, and to explore the putative roles of tumor necrosis factor-alpha (TNF-alpha)
Recombinant tumor necrosis factor/cachectin and interleukin 1 pretreatment decreases lung oxidized glutathione accumulation, lung injury, and mortality in rats exposed to hyperoxia.
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Single, preexposure, parenteral injection with both recombinant tumor necrosis factor/cachectin (TNF/C) and interleukin-1 (IL-1) prolonged the survival of rats (144 +/- 9 h) in continuous hyperoxia (greater than 99% O2 at 1 atm) when compared with rats injected with boiled TNF/C and boiled IL-1 (61
Legionella-induced acute lung injury in the setting of hyperoxia: protective role of tumour necrosis factor-alpha.
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Among the main characteristics of Legionella pneumophila pneumonia are acute lung injury and severe hypoxemia. Although high oxygen supplementation is a valuable supportive therapy in these patients, oxygen itself is known to be a risk factor for acute lung injury. The effects of hyperoxia on lung
Effect of endogenous nitric oxide on hyperoxia and tumor necrosis factor-alpha-induced leukosequestration and proinflammatory cytokine release in rat airways.
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OBJECTIVE
To investigate the effects of endogenous nitric oxide on hyperoxia and tumor necrosis factor-alpha-induced leukosequestration and proinflammatory cytokine release in rat airways.
METHODS
Prospective, randomized, controlled animal study.
METHODS
Experimental laboratory.
METHODS
Male
Effect of hyperoxia on liver necrosis induced by hepatotoxins.
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We have tested the effects of hyperbaric oxygen on necrosis of rat liver induced by the administration of several toxins. The extent of liver necrosis was determined 24 h after the administration of the toxins by measurement of serum levels of alanine and aspartate amino-transferases and by
Hypoxia, hyperoxia, ischemia, and brain necrosis.
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BACKGROUND
Human brains show widespread necrosis when death occurs after coma due to cardiac arrest, but not after hypoxic coma. It is unclear whether hypoxia alone can cause brain damage without ischemia. The relationship of blood oxygenation and vascular occlusion to brain necrosis is also
Role of tumor necrosis factor alpha and its receptor I in preconditioning by hyperoxia.
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Hyperoxic pretreatment (>95% O(2)) can evoke myocardial adaptation to ischemia, a method which is potentially clinically usable. We wanted to investigate the role of tumor necrosis factor alpha (TNFalpha) and its p55 receptor (receptor I) in signaling of hyperoxic adaptation to ischemia. Mice
Cytokine response during hyperoxia: sequential production of pulmonary tumor necrosis factor and interleukin-6 in neonatal rats.
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BACKGROUND
Exposure of newborn animals to high concentrations of oxygen leads to diffuse alveolar damage similar to that seen in bronchopulmonary dysplasia in human infants. Therefore, neonatal rats are a suitable practical model of hyperoxic lung damage in human infants.
OBJECTIVE
To determine the
Hyperoxia produces neuronal necrosis in the rat.
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Widespread cerebral neuronal necrosis occurred in newborn Sprague-Dawley rats submitted to three hours of pure oxygen (100% O2) at normal atmospheric pressure. Neuronal necrosis (NN) was most severe in the immediate newborn period and less marked with advanced maturation. It was minimal and
Moderate hyperoxia induces inflammation, apoptosis and necrosis in human umbilical vein endothelial cells: An in-vitro study.
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Perioperative oxygen (O2) therapy can cause hyperoxia. Extreme hyperoxia can injure the cardiovascular system and remote organs.
Our primary objective was to test the hypothesis that exposure to moderate hyperoxia will induce injury to human umbilical vein endothelial cells (HUVECs), a model for
Effects of hyperoxia on tumor necrosis factor alpha and Grobeta expression in newborn rabbit lungs.
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Chemokines have been implicated in the pathogenesis of many inflammatory processes, including bronchopulmonary dysplasia in mechanically ventilated premature infants. We hypothesized that early expression of the proinflammatory cytokine, tumor necrosis factor alpha (TNFalpha), would be followed by
Hyperoxia-induced cell death in the lung--the correlation of apoptosis, necrosis, and inflammation.
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Prolonged exposure to hyperoxia causes tissue damage in many organs and tissues. Since the entire surface area of lung epithelium is directly exposed to O2 and other inhaled agents, hyperoxia leads to the development of both acute and chronic lung injuries. These pathologic changes in the lung can
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