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Страница 1 от 33 резултата
Modulation of biochemical parameters by Hemidesmus indicus in cumene hydroperoxide-induced murine skin: possible role in protection against free radicals-induced cutaneous oxidative stress and tumor promotion.
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Hemidesmus indicus has been shown to possess significant activity against immunotoxicity and other pharmacological and physiological disorders. In this communication, we have shown the modulating effect of H. indicus on cumene hydroperoxide-mediated cutaneous oxidative stress and tumor promotion
Free radical generating agents lead to the rapid progression of benign skin tumors to carcinoma in iron-overloaded mice.
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Free radical generating compounds have been shown to enhance the malignant conversion of papillomas to carcinomas in mouse skin, and iron has been shown to participate in free radical generating reactions. In the present study, we investigated whether iron can play a role in the malignant conversion
Biological significance of DNA adducts: comparison of increments over background for various biomarkers of genotoxicity in L5178Y tk(+/-) mouse lymphoma cells treated with hydrogen peroxide and cumene hydroperoxide.
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DNA is affected by background damage of the order of one lesion per one hundred thousand nucleotides, with depurination and oxidative damage accounting for a major part. This damage contributes to spontaneous mutation and cancer. DNA adducts can be measured with high sensitivity, with limits of
Characteristics of the glutathione/glutathione-S-transferase detoxification system in melphalan resistant human prostate cancer cells.
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Glutathione (GSH) and glutathione-S-transferases (GST) have been implicated in resistance of tumor cells to certain alkylating agents, including melphalan. Glutathione levels and GST activities were determined in melphalan-resistant sublines of the human prostate carcinoma cell lines DU 145, PC-3
Elevation of pi class glutathione S-transferase activity in human breast cancer cells by transfection of the GST pi gene and its effect on sensitivity to toxins.
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Increased expression of the glutathione S-transferase (GST; E.C.2.5.1.18) pi class isozyme is associated with both malignant transformation and drug resistance, as well as with decreased estrogen receptor content in breast cancer. In order to further characterize the role of this enzyme in drug
Antioxidant and cytotoxic tocopheryl quinones in normal and cancer cells.
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We found previously that [d]-alpha-tocopherol (alpha-T) and [d]-gamma-tocopherol (gamma-T) are lipid antioxidants (thiobarbituric acid test) in model systems containing arachidonic acid (AA), cumene hydroperoxide, and Fe3+ and in smooth muscle cell (SMC) cultures challenged with AA. We now show that
Protective effect of photodegradation product of nifedipine against tumor necrosis factor alpha-induced oxidative stress in human glomerular endothelial cells.
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Recently, increasing evidence suggests that the antihypertensive drug nifedipine acts as a protective agent for endothelial cells, and that the activity is unrelated to its calcium channel blocking. Nitrosonifedipine (NO-NIF) is metabolically and photochemically produced from nifedipine, and NO-NIF
Antineoplastic drug sensitivity of human MCF-7 breast cancer cells stably transfected with a human alpha class glutathione S-transferase gene.
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Studies have suggested that the alpha class glutathione S-transferase (GST) may protect cells from the chemotherapeutic drugs chlorambucil and melphalan. In order to further define the function of human alpha class GST, a complementary DNA which encodes it was ligated into an expression vector under
Asymmetric α-hydroxylation of tetralone-derived β-ketoesters by using a guanidine-urea bifunctional organocatalyst in the presence of cumene hydroperoxide.
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Highly enantioselective catalytic oxidation of 1-tetralone-derived β-keto esters was achieved by using a guanidine-urea bifunctional organocatalyst in the presence of cumene hydroperoxide (CHP), a safe, commercially available oxidant. The α-hydroxylation products were obtained in 99% yield with up
An evaluation of the role of glutathione and its associated enzymes in the expression of differential sensitivities to antitumour agents shown by a range of human tumour cell lines.
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Glutathione and its associated enzyme activities have been quantitated in a series of human tumour continuous cell lines expressing a range of in vitro sensitivities to certain antitumour agents. Fourteen different parental lines and 15 various drug- and X-ray-selected resistant sublines have been
Characterization of the cancer chemopreventive NRF2-dependent gene battery in human keratinocytes: demonstration that the KEAP1-NRF2 pathway, and not the BACH1-NRF2 pathway, controls cytoprotection against electrophiles as well as redox-cycling compounds.
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To better understand the role of transcription factor NF-E2-related factor (NRF) 2 in the human and its contribution to cancer chemoprevention, we have knocked down its negative regulators, Kelch-like ECH-associated protein 1 (KEAP1) and broad-complex, tramtrack and bric à brac and cap'n'collar
Cumene hydroperoxide debilitates macrophage physiology by inducing oxidative stress: possible protection by alpha-tocopherol.
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Macrophages, the major phagocytes of body, are largely dependent on membrane for their apposite functioning. Cum-OOH, a catalyst used in chemical and pharmaceutical industry, is a peroxidative agent, which may induce oxidative stress in macrophages hampering the integrity of their membrane.
Activation of 4-(methylnitrosamino)-1-(3-pyridyl)-1-butanone (NNK) in human lung microsomes by cytochromes P450, lipoxygenase, and hydroperoxides.
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4-(Methylnitrosamino)-1-(3-pyridyl)-1-butanone (NNK), a potent tobacco-specific carcinogen, has been demonstrated to induce lung tumors in animals and is suspected to be a human carcinogen. Cytochromes P450 are the major enzymes responsible for the activation of NNK in microsomes from the lung and
Free radical production during metabolism of organic hydroperoxides by normal human keratinocytes.
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Evidence of a relationship between tumor production induced by various organic (hydro)peroxides and free radical formation has been shown in cultured murine keratinocytes and human skin-tumor cell line. In the present study the bioactivation of cumene hydroperoxide, t-butyl-hydroperoxide, and
Characterization of metabolic activation of pentachlorophenol to quinones and semiquinones in rodent liver.
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Pentachlorophenol (PCP), a widely used biocide, induces liver tumors in mice but not in rats. Metabolic activation of PCP to chlorinated quinones and semiquinones in liver cytosol from Sprague-Dawley rats and B6C3F1 mice was investigated in vitro (1) with microsomes in the presence of either
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