gliosarcoma/hypoxia

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Evaluation of the relationship between MR estimates of blood oxygen saturation and hypoxia: effect of an antiangiogenic treatment on a gliosarcoma model.

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OBJECTIVE To assess the reproducibility of the magnetic resonance (MR) estimate of blood oxygen saturation (sO(2)) in the rat brain, to evaluate the relationship between low MR estimate of sO(2) values and tissue hypoxia in a hypoxic and necrotic glioscarcoma model (9L gliosarcoma cells), and to

The influence of hypoxia on bioluminescence in luciferase-transfected gliosarcoma tumor cells in vitro.

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Firefly luciferase catalyzes the emission of light from luciferin in the presence of oxygen and adenosine triphosphate. This bioluminescence is commonly employed in imaging mode to monitor tumor growth and treatment responses in vivo. A potential concern is that, since solid tumors are often

Synchrotron microbeam radiation therapy induces hypoxia in intracerebral gliosarcoma but not in the normal brain.

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OBJECTIVE Synchrotron microbeam radiation therapy (MRT) is an innovative irradiation modality based on spatial fractionation of a high-dose X-ray beam into lattices of microbeams. The increase in lifespan of brain tumor-bearing rats is associated with vascular damage but the physiological

31P magnetic resonance spectroscopy is sensitive to tumor hypoxia: perfusion and oxygenation of rat 9L gliosarcoma after treatment with BCNU.

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The mechanism behind the relative increase in high-energy phosphates observed by MRS in many tumors following chemotherapy is poorly understood. To test the hypothesis that this metabolic activation is associated with a decrease in tumor hypoxia, tumor blood flow and oxygenation were measured in

Distribution of misonidazole adducts in 9L gliosarcoma tumors and spheroids: implications for oxygen distribution.

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The 9L rat gliosarcoma is a widely used experimental brain tumor which has an unusual radiation response. The radiation sensitivity of cells in subcutaneous tumors has been shown to be intermediate between those of aerobic and hypoxic 9L cells in vitro, and cells in spheroids and intracranial tumors

The radiation response of cells from 9L gliosarcoma tumours is correlated with [F18]-EF5 uptake.

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OBJECTIVE Tumour hypoxia affects cancer biology and therapy-resistance in both animals and humans. The purpose of this study was to determine whether EF5 ([2-(2-nitro-1-H-imidazol-1-yl)-N-(2,2,3,3,3-pentafluoropropyl)-acetamide]) binding and/or radioactive drug uptake correlated with single-dose

Increased efficacy of chemo- and radio-therapy by a hemoglobin solution in the 9L gliosarcoma.

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Tissue oxygen tensions were measured in the rat 9L gliosarcoma under conditions of normal air breathing or carbogen breathing and after intravenous administration of a hemoglobin solution with air breathing or carbogen breathing. Administration of the hemoglobin decreased the level of hypoxia in the

Bioluminescence imaging of the response of rat gliosarcoma to ALA-PpIX-mediated photodynamic therapy.

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Photodynamic therapy (PDT) is a promising modality for the treatment of solid tumors that combines a photosensitizing agent and light to produce cytotoxic reactive oxygen species that lead to tumor cell death. The recent introduction of bioluminescence imaging (BLI), involving the use of the

In vivo 31P nuclear magnetic resonance spectroscopy of subcutaneous 9L gliosarcoma: effects of tumor growth and treatment with 1,3-bis(2-chloroethyl)-1-nitrosourea on tumor bioenergetics and histology.

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In vivo 31P nuclear magnetic resonance spectroscopy was used to examine the bioenergetics of the rat 9L gliosarcoma during untreated growth and in response to chemotherapy with 1,3-bis(2-chloroethyl)-1-nitrosourea. Tumor growth was associated with a decline in the phosphocreatine and nucleoside

Oxygenation of the rat 9L gliosarcoma and the rat 13672 mammary carcinoma with various doses of a hemoglobin solution.

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Tumor oxygen tensions were measured using a computer controlled pO2 microelectrode in two preclinical solid tumor models, the rat 9L gliosarcoma and the rat 13672 mammary carcinoma. Tumor oxygenation profiles were determined under four conditions: 1) normal air breathing, 2) carbogen (95% O2/5% CO2)

Inhibition of ADAM17 reduces hypoxia-induced brain tumor cell invasiveness.

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The membrane-anchored metalloproteinase tumor necrosis factor-alpha-converting enzyme (TACE/a disintegrin and metalloproteinase [ADAM] 17) is key in proteolytic ectodomain shedding of several membrane-bound growth factors, cytokines and receptors. The expression and activity of ADAM17 increases

Influence of an anti-angiogenic treatment on 9L gliosarcoma: oxygenation and response to cytotoxic therapy.

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Tissue oxygen tensions were measured in subcutaneously growing rat 9L gliosarcoma under normal air and carbogen breathing conditions prior to and after i.v. administration of a perflubron emulsion. When these animals were treated with the anti-angiogenic agents TNP-470 and minocycline for 5 days

Activation of hypoxia signaling induces phenotypic transformation of glioma cells: implications for bevacizumab antiangiogenic therapy.

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Glioblastoma (GBM) is the most common and deadly primary brain tumor in adults. Bevacizumab, a humanized monoclonal antibody against vascular endothelial growth factor (VEGF), can attenuate tumor-associated edema and improve patient symptoms but based on magnetic resonance imaging, is associated

Gliosarcoma: clinical experiences and additional information with MR spectroscopy.

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Gliosarcomas represent about 2% of glioblastoma multiforme (WHO grade IV). They have mixed features of glial and sarcomatous components. The clinical presentation and prognosis are similar to glioblastoma. Between 1997 and 2006, 16 patients with intracranial gliosarcoma were treated in the

Increased tumor oxygenation and radiation sensitivity in two rat tumors by a hemoglobin-based, oxygen-carrying preparation.

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The rat 13762 mammary carcinoma and the rat 9L gliosarcoma were grown subcutaneously in a hind limb of female, Fisher 344 rats. The oxygen content of the tumors was determined using an Eppendorf pO2 histograph. Fifty-to-sixty oxygen measurements were made per tumor and there were 8-to-10 animals per

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Herbal & Natural Medicine

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