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Страница 1 от 89 резултата
Differences in the localization and extent of the renal proximal tubular necrosis caused by mercapturic acid and glutathione conjugates of 1,4-naphthoquinone and menadione.
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We have previously demonstrated that administration of various benzoquinol-glutathione (GSH) conjugates to rats causes renal proximal tubular necrosis and the initial lesion appears to lie within that portion of the S3 segment within the outer stripe of the outer medulla (OSOM). The toxicity may be
Menadione induces both necrosis and apoptosis in rat pancreatic acinar AR4-2J cells.
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This study evaluated the action of menadione on cell proliferation and integrity of the rat pancreatic acinar cell line, AR4-2J. Menadione at 1-20 microM dose- and time-dependently inhibited cell proliferation of AR4-2J cells. In contrast, a high concentration of menadione (100 microM) caused rapid
Ultrastructural basis for the transition of cell death mode from apoptosis to necrosis in menadione-treated osteosarcoma 143B cells.
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Time-dependent ultrastructural changes of menadione-treated human osteosarcoma 143B cells were correlated with those in their stainability to Annexin V and propidium iodide (PI). Populations of both apoptotic (Annexin V(+)/PI(-)) and necrotic (Annexin V(+)/PI(+)) cells, judged by flow cytometry,
A possible involvement of plasma membrane NAD(P)H oxidase in the switch mechanism of the cell death mode from apoptosis to necrosis in menadione-induced cell injury.
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The effects of inhibitors of plasma membrane NADPH oxidase on menadione-induced cell injury processes were studied using human osteosarcoma 143B cells. The intracellular level of superoxide in the cells treated with menadione for 6 h reached a maximum followed by an abrupt decrease. The population
The switch mechanism of the cell death mode from apoptosis to necrosis in menadione-treated human osteosarcoma cell line 143B cells.
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Time-dependent changes in the cell death mode from apoptosis to necrosis were studied in cultured 143B cells treated with menadione, an anti-cancerous drug, excluding a possible involvement of "secondary necrosis." The population of apoptotic cells judged by FITC-Annexin V and propidium iodide (PI)
Prevention by menadione of the hepatotoxic effects in chickens fed rapeseed meal. Observations on coagulation factors and cytochrome P-450.
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Rapeseed meal, the residue after oil extraction, is an animal feed of great commercial interest. Some genetic strains of rapeseed yield a meal which when fed in high concentration produces hemorrhagic lesions in the liver of chickens. These lesions are reduced in incidence by the simultaneous
[Induction of programmed cell death by menadione in suspension culture of carrot cells].
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Menadione (VK3), a quinone that undergoes redox cycles leading to the formation of superoxide radicals, was found to induce cell death in suspension culture of carrot cells. The effect of menadione was in a dose-dependent manner. 100-800 mumol/L menadione caused 10-33 percent cell death. When
Oxidative stress by ascorbate/menadione association kills K562 human chronic myelogenous leukaemia cells and inhibits its tumour growth in nude mice.
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The effect of oxidative stress induced by the ascorbate/menadione-redox association was examined in K562 cells, a human erythromyeloid leukaemia cell line. Our results show that ascorbate enhances menadione redox cycling, leading to the formation of intracellular reactive oxygen species (as shown by
Calcium signalling and pancreatic cell death: apoptosis or necrosis?
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Secretagogues, such as cholecystokinin and acetylcholine, utilise a variety of second messengers (inositol trisphosphate, cADPR and nicotinic acid adenine dinucleotide phosphate) to induce specific oscillatory patterns of calcium (Ca(2+)) signals in pancreatic acinar cells. These are tightly
Apoptosis Induction by Menadione in Human Promyelocytic Leukemia HL-60 Cells.
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Cell death induced by menadione (vitamin K-3,2-methyl-1,4-naphthoquinone) has been investigated in human promyelocytic leukemia HL-60 cells. Menadione was found to induce both apoptosis and necrosis in HL-60 cells. Low concentration (1~50 µM) of menadione induced apoptotic cell death, which was
INDUCED PROTECTION OF ADRENAL CORTEX AGAINST 7,12-DIMETHYLBENZ(ALPHA)ANTHRACENE. INFLUENCE OF ETHIONINE. INDUCTION OF MENADIONE REDUCTASE. INCORPORATION OF THYMIDINE-H3.
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7,12-Dimethylbenz[a]anthracene (7,12-DMBA) exerts adrenocorticolytic effects which set it apart from all other polynuclear aromatic hydrocarbons and aromatic amines which have been investigated. Adrenal damage by this compound appears to be due to its steric and electronic properties together with
A possible role of oxidative stress in the switch mechanism of the cell death mode from apoptosis to necrosis--studies on rho0 cells.
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Apoptosis is induced not only during morphogenesis and embryogenesis but also under various pathological conditions, especially related to oxidative stress. Apoptotic cells are phagocytized by neighboring cells while necrotic cells cause local and general reactions sometimes lethal to our bodies.
Protection of cells from menadione-induced apoptosis by inhibition of lipid peroxidation.
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Menadione is a commonly used compound that causes oxidative stress. We investigated the influence of lipid peroxidation on the apoptotic response of mouse myogenic C2C12 cells following menadione-induced oxidative stress. The presence of hypodiploid cells and phosphatidylserine translocation were
Nonselective cation channels as effectors of free radical-induced rat liver cell necrosis.
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Necrosis, as opposed to apoptosis, is recognized as a nonspecific cell death that induces tissue inflammation and is preceded by cell edema. In non-neuronal cells, the latter has been explained by defective outward pumping of Na(+) caused by metabolic depletion or by increased Na(+) influx via
Role of mitochondria in the switch mechanism of the cell death mode from apoptosis to necrosis--studies on rho0 cells.
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Detailed mechanisms of the switch of the cell death mode from apoptosis to necrosis remain to be solved, although the intracellular level of ATP and that of free radicals have been postulated to be the major factors involved in the mechanisms. In the present study menadione (MEN)-induced cell injury
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