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Page 1 od 246 rezultati
Spectroscopic imaging of the water resonance with short repetition time to study tumor response to hyperoxia.
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A variety of treatments that modulate tumor oxygen tension are used clinically to improve the outcome of radiotherapy. High resolution, noninvasive measurements of the effects of these treatments would greatly facilitate the development of improved therapies and could guide treatment of cancer
Effects of hyperoxia on T2* and resonance frequency weighted magnetic resonance images of rodent tumours.
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Experiments were performed to determine whether T2* and resonance frequency weighted MR images are sensitive to effects of hyperoxia on model tumors. Hyperoxia can increase tumor oxygen tension and thus affect T2* and/or the average resonance frequency within each image voxel due to the
Effects of different levels of hypercapnic hyperoxia on tumour R(2)* and arterial blood gases.
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The hypercapnia induced by carbogen (95% O(2)/5% CO(2)) breathing, which is being re-evaluated as a clinical radiosensitiser, causes patient discomfort and hence poor compliance. Recent preclinical and clinical studies have indicated that the CO(2) content might be lowered without compromising
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
Simultaneous exposure to nicotine and hyperoxia causes tumors in hamsters.
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BACKGROUND
We have shown that the nicotine-derived nitrosamine 4-(methyl-nitrosamino)-3-(pyridyl)-1-butanone (NNK) causes a high incidence of neuroendocrine lung tumors in male Syrian golden hamsters when administered to animals maintained in an atmosphere of 60% hyperoxia. In vitro studies with
Effects of hyperoxia on growth characteristics of metastatic murine tumors in the lung.
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Suspensions of an oxygen-sensitive (MT-7) and of an oxygen-insensitive(M109) tumor cell line were injected i.v. into BALB/c mice. Exposure to 100% O2 after injection of the cells did not modify the initial arrest of either cell line in the lung. Exposure of animals given injections of MT-7 cells for
Molecular characterization of neuroendocrine lung-tumors induced in hamsters by treatment with nitrosamines and hyperoxia.
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Treatment of hamsters with nitrosamines and hyperoxia (60% O2) induces neuroendocrine lung tumors. Analysis of 8 different tumors from 7 different hamsters demonstrated 2- to 3.5-fold increases in the expression of c-myc in 4 of 8 tumors, c-fos in 3 tumors, c-jun in 1 tumor, c-raf in 1 tumor, and
Changes in T2*-weighted images during hyperoxia differentiate tumors from normal tissue.
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Experiments were performed to determine whether changes in T2*-weighted MR images during and after hyperoxia differentiate tumors from normal tissue. Mammary adenocarcinomas implanted in the right hind limbs of rats were studied. Gradient echo images were obtained at 2 Tesla with an evolution time
Effect of overexpression of hypoxia-inducible factor-1α induced by hyperoxia in vivo in LNCaP tumors on tumor growth rate.
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OBJECTIVE
To study effect of overexpression of hypoxia-inducible factor-1α induced by hyperoxia in vivo in LNCaP tumors on tumor growth rate.
METHODS
The prostate cancer LNCaP cells were inoculated in the abdomen of mice. All the mice were randomly placed in the gas chamber with different oxygen
Effectiveness of respiratory hyperoxia, of normobaric and of hyperbaric oxygen atmospheres in improving tumor oxygenation.
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Tumor oxygenation during respiratory hyperoxia is dependent on the tumor growth site, on the growth stage, and hence on the vascular pattern. Diffusion of O2 from the surrounding atmosphere contributes considerably to the oxygenation of subcutaneous tumors during normobaric exposure to a pure O2
Long-Term Deleterious Effects of Short-term Hyperoxia on Cancer Progression-Is Brain-Derived Neurotrophic Factor an Important Mediator? An Experimental Study.
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Perioperative factors promoting cancer recurrence and metastasis are under scrutiny. While oxygen toxicity is documented in several acute circumstances, its implication in tumor evolution is poorly understood. We investigated hyperoxia long-term effects on cancer progression and some underlying
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)
Pathobiology of lung tumors induced in hamsters by 4-(methylnitrosamino)-1-(3-pyridyl)-1-butanone and the modulating effect of hyperoxia.
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Neuroendocrine lung cancer is among the most common types of lung cancers in smokers. We have recently shown that exposure of hamsters to N-nitrosodiethylamine and hyperoxia causes a high incidence of this tumor type. In this study, we show that the tobacco-specific nitrosamine
Normobaric hyperoxia inhibits the progression of lung cancer by inducing apoptosis.
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Hypoxia is a critical characteristic of solid tumors with respect to cancer cell survival, angiogenesis, and metastasis. Hyperoxic treatment has been attempted to reverse hypoxia by enhancing the amount of dissolved oxygen in the plasma. In this study, we evaluated the effects of normobaric
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