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Pagina 1 a partire dal 884 risultati
Identification of one-electron reductases that activate both the hypoxia prodrug SN30000 and diagnostic probe EF5.
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SN30000 is a second-generation benzotriazine-N-oxide hypoxia-activated prodrug scheduled for clinical trial. Previously we showed that covalent binding of the hypoxia probe EF5 predicts metabolic activation of SN30000 in a panel of cancer cell lines under anoxia, suggesting that they are activated
Biliverdin reductase/bilirubin mediates the anti-apoptotic effect of hypoxia in pulmonary arterial smooth muscle cells through ERK1/2 pathway.
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Inhibition of pulmonary arterial smooth muscle cell (PASMC) apoptosis induced by hypoxia plays an important role in pulmonary arterial remodeling leading to aggravate hypoxic pulmonary arterial hypertension. However, the mechanisms of hypoxia acting on PASMC apoptosis remain exclusive. Biliverdin
Intermittent hypoxia, brain glyoxalase-1 and glutathione reductase-1, and anxiety-like behavior in mice.
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OBJECTIVE
Sleep apnea has been associated with anxiety, but the mechanisms of the sleep apnea-anxiety relationship are unresolved. Sleep apnea causes oxidative stress, which might enhance anxiety-like behavior in rodents. To clarify the apnea-anxiety connection, we tested the effect of intermittent
Purification and properties of glutathione reductase from liver of the anoxia-tolerant turtle, Trachemys scripta elegans.
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Glutathione reductase (GR) is a homodimeric flavoprotein that catalyzes the reduction of oxidized glutathione (GSSG) using NADPH as a cofactor. The enzyme is a major component of cellular defense mechanisms against oxidative injury. In this study, GR was purified from the liver of the
The anti-necrosis role of hypoxic preconditioning after acute anoxia is mediated by aldose reductase and sorbitol pathway in PC12 cells.
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It has been demonstrated that hypoxic preconditioning (HP) enhances the survival ability of the organism against the subsequent acute anoxia (AA). However, it is not yet clear whether necrosis induced by AA can be prevented by HP, and what are the underlying mechanisms. In this study, we examined
Nitrate reductase regulation in tomato roots by exogenous nitrate: a possible role in tolerance to long-term root anoxia.
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The mechanism of nitrate reductase (NR) regulation under long-term anoxia in roots of whole plants and the putative role of nitrate in anoxia tolerance have been addressed. NR activity in tomato roots increased significantly after 24 h of anaerobiosis and increased further by 48 h, with a
Counteraction of pRb-dependent protection after extreme hypoxia by elevated ribonucleotide reductase.
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We have studied hypoxia-induced cell cycle arrest in human cells where the retinoblastoma tumour suppressor protein (pRb) is either functional (T-47D and T-47DHU-res cells) or abrogated by expression of the HPV18 E7 oncoprotein (NHIK 3025 cells). We have previously found that pRb is dephosphorylated
Characterization of the human biliverdin reductase gene structure and regulatory elements: promoter activity is enhanced by hypoxia and suppressed by TNF-alpha-activated NF-kappaB.
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hBVR is a Ser/Thr/Tyr kinase/scaffold protein/transcription factor/intracellular transporter of regulators. hBVR is an upstream activator of the insulin/IGF-1/MAPK/PI3K signaling pathway, and of NF-kappaB. As a reductase, it converts biliverdin to the antioxidant, bilirubin. hBVR gene has 8 exons;
The thioredoxin reductase activity and hypoxia-inducible factor 1 alpha level in anaerobic and aerobic macrophages.
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OBJECTIVE
This study was aimed to demonstrate the thioredoxin reductase (TrxR) activities and Hypoxia-Inducible Factor 1 alpha (HIF-1α) levels in macrophage cell line incubated in aerobic and anaerobic settings.
BACKGROUND
Pathological situations including inflammatory disorders are associated with
Hypoxia inhibits pulmonary artery endothelial cell apoptosis via the e-selectin/biliverdin reductase pathway.
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Hypoxia-induced inhibition of apoptosis in pulmonary artery endothelial cells (PAECs) has an important role in pulmonary arterial remodeling leading to aggravated hypoxic pulmonary arterial hypertension. However, the mechanisms involved in the hypoxia-induced inhibition of PAEC apoptosis have not
Biliverdin reductase plays a crucial role in hypoxia-induced chemoresistance in human glioblastoma.
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Hypoxia-induced alterations in the cellular redox status play a critical role in the development of hypoxia-induced chemoresistance in cancer cells. Human biliverdin reductase (hBVR), an enzyme involved in the conversion of biliverdin into bilirubin in heme metabolism, was recently identified as an
Reactive oxygen species-independent oxidation of thioredoxin in hypoxia: inactivation of ribonucleotide reductase and redox-mediated checkpoint control.
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We have investigated the role of cellular redox state on the regulation of cell cycle in hypoxia and shown that whereas cells expressing mutant thioredoxin (Trx) or a normal level of Trx undergo increased apoptosis, cells overexpressing Trx are protected against apoptosis. We show that hypoxia
Genetically modified macrophages expressing hypoxia regulated cytochrome P450 and P450 reductase for the treatment of cancer.
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This study describes a combined gene and cell therapy based on the genetic modification of primary human macrophages, as a treatment for cancer. Here, we have utilised the tumour-infiltrating properties of macrophages as vehicles to deliver a gene encoding a prodrug-activating enzyme such as human
Anoxia, acidosis, and intergenic interactions selectively regulate methionine sulfoxide reductase transcriptions in mouse embryonic stem cells.
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Methionine sulfoxide reductases (Msr) belong to a gene family that contains one MsrA and three MsrBs (MsrB1, MsrB2, and MsrB3). We have identified all four of the genes that are expressed in mouse embryonic stem cell cultures. The vital cellular functions of the Msr family of genes are to protect
Hypoxia-induced synthesis of respiratory nitrate reductase 2 of Streptomyces coelicolor A3(2) depends on the histidine kinase OsdK in mycelium but not in spores.
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The three nitrate reductases (Nar) of the saprophytic aerobic actinobacterium Streptomyces coelicolor A3(2) contribute to survival when oxygen becomes limiting. In the current study, we focused on synthesis of the Nar2 enzyme, which is the main Nar enzyme present and active in exponentially growing
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