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1 4 naphthoquinone/hypoxia
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Sivu 1 alkaen 27 tuloksia
NLNQ-1, a 2-[3-(2-nitro-1-imidazolyl) propylamino]-3-chloro-1,4-naphthoquinone, as a hypoxia-selective cytotoxin and radiosensitizer.
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BACKGROUND
Compounds bearing two independent redox centers are considered bis-bioreductive agents and usually demonstrate increased hypoxic selectivity with exposure time due to different requirements for reduction of each center. We have synthesized a novel
Evaluation of 5-hydroxy-1,4-naphthoquinone-cobalt(III) complexes for hypoxia-activated drug delivery.
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Three novel Py2N2-cobalt(III) complexes with the 5-hydroxy-1,4-naphthoquinone nuclei (NQ) were evaluated as potential hypoxia-activated anticancer prodrugs. The complexes were synthesized and fully characterized by IR and UV-Visible spectroscopies, ESI mass spectrometry and CHN
Cancer therapeutic agents targeting hypoxia-inducible factor-1.
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The discovery of hypoxia-inducible factor-1 has led to a rapidly increasing understanding of the molecular mechanism of tumor hypoxia in the past two decades. Today it is generally accepted that HIF-1 plays a pivotal role in the cellular response to tumor hypoxia which represents a major obstacle to
Mitochondrial complex I, aconitase, and succinate dehydrogenase during hypoxia-reoxygenation: modulation of enzyme activities by MnSOD.
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Both NADH dehydrogenase (complex I) and aconitase are inactivated partially in vitro by superoxide (O2-.) and other oxidants that cause loss of iron from enzyme cubane (4Fe-4S) centers. We tested whether hypoxia-reoxygenation (H-R) by itself would decrease lung epithelial cell NADH dehydrogenase,
[The correction of energy metabolism disorders in hypoxia by using vitamin K].
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A study was made of the possibility of correcting respiratory chain function disorders in hypoxia by means of the naphthoquinone derivative vitamin K3. The antihypoxic activity of that compound is defined by its donor-acceptor properties and its capability to shunt the electron flow from NADH to
Shikonin‑mediated inhibition of nestin affects hypoxia‑induced proliferation of pulmonary artery smooth muscle cells.
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The imbalance between the proliferation and apoptosis of pulmonary artery smooth muscle cells (PASMCs) is of importance in pulmonary vascular remodeling. Shikonin, a naphthoquinone compound extracted from the Chinese medicinal herb Lithospermum erythrorhizon, inhibits the proliferation of rat smooth
6-(1-Oxobutyl)-5,8-dimethoxy-1,4-naphthoquinone inhibits lewis lung cancer by antiangiogenesis and apoptosis.
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Lung cancer is a leading cause of cancer mortality worldwide. Novel and nontoxic agents targeting angiogenesis and tumor cell proliferation and survival are desirable for lung cancer chemoprevention and treatment. Previously we have reported that 6-(1-oxobutyl)-5,8-dimethoxy-1,4-naphthoquinone (OXO)
The interaction of superoxide with nitric oxide destabilizes hypoxia-inducible factor-1alpha.
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In renal carcinoma cells (RCC4) hypoxia inducible factor-1 (HIF-1) is constitutively expressed due to a von Hippel Lindau protein deficiency, but can be degraded by calpain, independently of the 26S proteasome, when exposed to hypoxia/nitric oxide (NO). In this study we examined molecular mechanisms
Reactive oxygen species attenuate nitric-oxide-mediated hypoxia-inducible factor-1alpha stabilization.
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Tissue hypoxia/ischemia are major pathophysiological determinants. Conditions of decreased oxygen availability provoke accumulation and activation of hypoxia-inducible factor-1 (HIF-1). Recent reports demonstrate a crucial role of HIF-1 for inflammatory events. Regulation of hypoxic responses by the
NO restores HIF-1alpha hydroxylation during hypoxia: role of reactive oxygen species.
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The activity of hypoxia-inducible factor 1 (HIF-1) is primarily determined by stability regulation of its alpha subunit, which is stabilized under hypoxia but degraded during normoxia. Hydroxylation of HIF-1alpha by prolyl hydroxylases (PHDs) recruits the von Hippel-Lindau (pVHL) E3 ubiquitin ligase
p38mapk and MEK1/2 inhibition contribute to cellular oxidant injury after hypoxia.
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Lung epithelial cells produce increased reactive oxygen species (ROS) after hypoxia exposure, and they are more susceptible after hypoxia to injury by agents that generate superoxide [O2-; e.g., 2,3-dimethoxy-1,4-naphthoquinone (DMNQ)]. Cellular GSH and MnSOD both decrease in hypoxic lung epithelial
In vivo inhibition of tumor progression by 5 hydroxy-1,4-naphthoquinone (juglone) and 2-(4-hydroxyanilino)-1,4-naphthoquinone (Q7) in combination with ascorbate.
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The purpose of the study was to obtain further in vivo data of antitumor effects and mechanisms triggered by juglone and Q7 in combination with ascorbate. The study was done using Ehrlich ascites tumor-bearing mice. Treatments were intraperitoneal every 24 h for 9 days. Control group was treated
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
Effect of venotropic drugs on the respiratory activity of isolated mitochondria and in endothelial cells.
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Several drugs used in the treatment of chronic peripheral ischaemic and venous diseases, i.e. aescine, Cyclo 3, Ginkor Fort, hydroxyethylrutosides, naftidrofuryl, naphthoquinone and procyanidolic oligomers, were tested on the mitochondrial respiratory activity. The results show that all these drugs
Marine Polyhydroxynaphthoquinone, Echinochrome A: Prevention of Atherosclerotic Inflammation and Probable Molecular Targets
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The effect of low doses of echinochrome A (EchA), a natural polyhydroxy-1,4-naphthoquinone pigment from the sea urchin Scaphechinus mirabilis, has been studied in clinical trials, when it was used as an active substance of the drug Histochrome® and biologically active supplement
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