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7 rezultatus
Isolation, identification, and assay of [3H]-porfiromycin adducts of EMT6 mouse mammary tumor cell DNA: effects of hypoxia and dicumarol on adduct patterns.
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[3H]-(N-la-methyl) Porfiromycin (POR) was employed to detect and identify the radiolabeled mono- and bis-adducts formed in living EMT6 mouse mammary tumor cells under different conditions. To provide authentic standard adducts, calf-thymus DNA was treated with POR under reductive activation, then
Adducts of mitomycin C and DNA in EMT6 mouse mammary tumor cells: effects of hypoxia and dicumarol on adduct patterns.
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6-CH3-3H-Mitomycin C (MC) was used to identify MC-DNA adducts formed in EMT6 mouse mammary tumor cells. DNA was isolated from cells treated with 3H-MC. The DNA was enzymatically digested, and the digest was analyzed for 3H-labeled adducts by high performance liquid chromatography. All four major
Retention of misonidazole in normal and malignant tissues: interplay of hypoxia and reductases.
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Tritiated misonidazole (MISO) was injected intravenously (iv) into mice bearing five different tumors. At 24 hr the tumors were removed for analysis of bound MISO, and at the same time three normal tissues were removed (liver, labial gland, and esophagus). The labial gland and esophagus were
Effects of menadione and its derivative on cultured cardiomyocytes with mitochondrial disorders.
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Mitochondrial disorder is characteristic of many myocardial injuries such as endotoxemia, shock, acidosis, ischemia/reperfusion, and others. The goal of possible therapy is to increase ATP production. Derivatives of vitamins K may be a potent electron carrier between various mitochondrial
Bioactivation of mitomycin antibiotics by aerobic and hypoxic Chinese hamster ovary cells overexpressing DT-diaphorase.
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DT-Diaphorase catalyzes a two-electron reduction of mitomycin C (MC) and porfiromycin (POR) to reactive species. Many cell lines that overexpress DT-diaphorase and are sensitive to the mitomycins are protected from the aerobic cytotoxicity of these drugs by the DT-diaphorase inhibitor dicumarol. The
Reductive activation of mitomycin C by NADH:cytochrome b5 reductase.
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Mitomycin C requires bioreduction in order to exert its cytotoxic action. Activation of mitomycin C to an electrophile was equally supported by NADPH and NADH in EMT6 tumor cell sonicates under hypoxia. No alkylation was observed under aerobic conditions. Purified NADH:cytochrome b5 reductase
Role of dt-diaphorase as a determinant of sensitivity to mitomycin analogs in nonsmall cell lung-cancer cell-lines.
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DT-diaphorase (DT-D) is regarded as a two-electron reductase that plays an important role in the biotransformation of mitomycin C (MMC) to antitumor metabolites, which is enhanced under hypoxic conditions. To evaluate the role of DT-D as a bioactivator of MMC and its analogue, KW-2149, in non-small
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