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Role of NAD(P)H:(quinone acceptor) oxidoreductase (DT-diaphorase) in activation of mitomycin C under hypoxia.
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The role of the two-electron reducing enzyme DT-diaphorase in the activation of mitomycin C under hypoxic conditions was investigated. Mitomycin C activity was compared in L5178Y murine lymphoblasts, which have low levels of DT-diaphorase activity, and L5178Y/HBM10 cells, which have elevated levels
Hypoxia mimetic activity of VCE-004.8, a cannabidiol quinone derivative: implications for multiple sclerosis therapy.
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BACKGROUND
Multiple sclerosis (MS) is characterized by a combination of inflammatory and neurodegenerative processes variously dominant in different stages of the disease. Thus, immunosuppression is the goal standard for the inflammatory stage, and novel remyelination therapies are pursued to
Radicals from one-electron reduction of nitro compounds, aromatic N-oxides and quinones: the kinetic basis for hypoxia-selective, bioreductive drugs.
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Drugs based on nitroarene, aromatic N-oxide or quinone structures are frequently reduced by cellular reductases to toxic products. Reduction often involves free radicals as intermediates which react rapidly with oxygen to form superoxide radicals, inhibiting drug reduction. The elevation of cellular
Design, synthesis, and biological evaluation of NAD(P)H: Quinone oxidoreductase (NQO1)-targeted oridonin prodrugs possessing indolequinone moiety for hypoxia-selective activation.
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The enzyme NQO1 is a potential target for selective cancer therapy due to its overexpression in certain hypoxic tumors. A series of prodrugs possessing a variety of cytotoxic diterpenoids (oridonin and its analogues) as the leaving groups activated by NQO1 were synthesized by functionalization of
Quinone-enhanced ascorbate reduction of nitric oxide: role of quinone redox potential.
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The quinones 1,4-naphthoquinone (NQ), methyl-1,4-naphthoquinone (MNQ), trimethyl-1,4-benzoquinone (TMQ) and 2,3-dimethoxy-5-methyl-1,4-benzoquinone (UQ-0) enhance the rate of nitric oxide (NO) reduction by ascorbate in nitrogen-saturated phosphate buffer (pH 7.4). The observed rate constants for
Single-electron reduction of quinone and nitroaromatic xenobiotics by recombinant rat neuronal nitric oxide synthase.
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We examined the kinetics of single-electron reduction of a large number of structurally diverse quinones and nitroaromatic compounds, including a number of antitumour and antiparasitic drugs, and nitroaromatic explosives by recombinant rat neuronal nitric oxide synthase (nNOS, EC 1.14.13.39), aiming
Inducers of hypoxic response: marine sesquiterpene quinones activate HIF-1.
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The hypoxia-inducible factor-1 (HIF-1) transcription factor regulates cellular oxygen homeostasis. Agents that activate HIF-1 and downstream HIF targets represent potential drug leads for the prevention and/or treatment of ischemic disorders. In a search for small-molecule HIF-1 activators, 1936
[Oxidative metabolism and myocardial function in rats with different sensitivities to oxygen deficiency in hypoxia].
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In exposure to mild hypoxia, the electron-transport function of the myocardial respiratory chain in the NAD-cytochrome b area is limited in a different manner in animals highly resistant (HR) and those poorly resistant (PR) to hypoxia. In PR animals this process develops very rapidly, leads to
Inhibition of SETD7 protects cardiomyocytes against hypoxia/reoxygenation-induced injury through regulating Keap1/Nrf2 signaling.
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The protein SET domain-containing lysine methyltransferase 7 (SETD7) has recently been shown to regulate apoptosis in various cells. However, the role of SETD7 on cardiomyocyte apoptosis during myocardial ischemia/reperfusion injury remains unclear. This study aimed to investigate the potential role
Che-1 attenuates hypoxia/reoxygenation-induced cardiomyocyte apoptosis by upregulation of Nrf2 signaling.
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OBJECTIVE
Hypoxia/reoxygenation (H/R)-induced cardiomyocyte apoptosis plays a critical role in the development of myocardial infarction. Che-1 has been reported as an anti-apoptotic gene in response to various cellular stresses. However, whether Che-1 regulates cardiomyocyte apoptosis in myocardial
Polyketide Quinones Are Alternate Intermediate Electron Carriers during Mycobacterial Respiration in Oxygen-Deficient Niches.
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Mycobacterium tuberculosis (Mtb) adaptation to hypoxia is considered crucial to its prolonged latent persistence in humans. Mtb lesions are known to contain physiologically heterogeneous microenvironments that bring about differential responses from bacteria. Here we exploit metabolic variability
[Antihypoxic effects of quinones connected with restoration of electro-transport and function of the respiratory chain of the isolated rat heart].
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The effect of hypoxia of middle severity (H50) has been investigated on the contractile activity, oxidative metabolism and bioenergetic function of the myocardium in the isolated rat heart. It has been shown that differences in the functional-metabolic parameters sensitivity in the resistant and
Activation of AP-1 and of a nuclear redox factor, Ref-1, in the response of HT29 colon cancer cells to hypoxia.
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Many solid tumors contain substantial fractions of hypoxic cells which are relatively resistant to both radiation therapy and certain cytotoxic drugs. We have previously shown that exposure of human HT29 cells to hypoxic conditions results in the overexpression of certain enzymes involved in the
Quinone-enhanced reduction of nitric oxide by xanthine/xanthine oxidase.
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The quinones 1,4-naphthoquinone, methyl-1,4-naphthoquinone, tetramethyl-1,4-benzoquinone, 2,3-dimethoxy-5-methyl-1,4-benzoquinone, 2,6-dimethylbenzoquinone, 2,6-dimethoxybenzoquinone, and 9,10-phenanthraquinone enhance the rate of nitric oxide reduction by xanthine/xanthine oxidase in
Cellular pharmacology of quinone bioreductive alkylating agents.
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The cellular pharmacology of the mitomycin bioreductive alkylating agents is complex. This reflects in part the chemical characteristics of these quinones, which have multiple sites of reactivity and the capacity to produce a large number of different lesions of biological importance. Moreover, at
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