oxygenase/hypoxia

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Enhanced translation of heme oxygenase-2 preserves human endothelial cell viability during hypoxia.

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Heme oxygenases (HOs) -1 and -2 catalyze the breakdown of heme to release carbon monoxide, biliverdin, and ferrous iron, which may preserve cell function during oxidative stress. HO-1 levels decrease in endothelial cells exposed to hypoxia, whereas the effect of hypoxia on HO-2 expression is

Evidence for a role of heme oxygenase-1 in the control of cardiac function in zebrafish (Danio rerio) larvae exposed to hypoxia.

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Carbon monoxide (CO) is a gaseous neurotransmitter produced from the breakdown of heme via heme oxygenase-1 (HO-1; hypoxia-inducible isoform) and heme oxygenase-2 (HO-2; constitutively expressed isoform). In mammals, CO is involved in modulating cardiac function. The role of the HO-1/CO system in

Combined gene therapy with hypoxia-inducible factor-1α and heme oxygenase-1 for therapeutic angiogenesis.

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Transfection with either hypoxia-inducible factor-1α (HIF-1α) or heme oxygenase-1 (HO-1) gene can induce neovascularization in ischemic tissues. Although expression of transfected HIF-1α gene occurs rapidly, the expressed HIF-1α protein degrades quickly, limiting its therapeutic efficacy. Meanwhile,

Effects of hypoxia on heme oxygenase expression in human chorionic villi explants and immortalized trophoblast cells.

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Although hypoxia induces heme oxygenase (HO)-1 protein and mRNA expression in many cell types, hypoxia has also been shown to decrease HO-1 mRNA and protein expression. We tested the hypothesis that 24-h preexposure to hypoxia in human placental preparations suppresses HO protein expression and

Heme oxygenase-1-dependent central cardiorespiratory adaptations to chronic intermittent hypoxia in mice.

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Chronic intermittent hypoxia (CIH) increases sympathetic tone and respiratory instability. Our previous work showed that chronic hypoxia induces the oxygen-sensing enzyme heme oxygenase-1 (HO-1) within the C1 sympathoexcitatory region and the pre-Bötzinger complex (pre-BötC). We therefore examined

Differential regulation of cardiac heme oxygenase-1 and vascular endothelial growth factor mRNA expressions by hemin, heavy metals, heat shock and anoxia.

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Increasing attention has been paid to the effects of hypoxia, heavy metals and heat shocks on gene expression and to the similarities in their actions. This paper compares mRNA levels of two putative hypoxia, heavy metal and heat shock sensitive genes: heme oxygenase-1 (HO-1) and vascular

Reduction of hypoxia-inducible heme oxygenase-1 in the myocardium after left ventricular mechanical support.

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Left ventricular assist devices (LVAD) may improve cardiac function. The pathogenesis of this phenomenon, called 'reverse remodelling', is not completely elucidated. To examine the hypothesis that LVAD support eliminates tissue stress by reducing local hypoxia, the distribution of heme oxygenase-1

Activity of heme oxygenase-1 affects expression levels of hypoxia inducible factor-1 gene in vitro.

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BACKGROUND One effect of solid tumors is severe hypoxia of local tissues. Heme oxygenase-1 (HO-1) is highly expressed in a variety of human tumor tissues; its induction and activity are closely related to growth of solid tumors. Hypoxia inducible factor-1 (HIF-1) is a transcription factor that

Inducible nitric oxide synthase and heme oxygenase-1 in rat heart: direct effect of chronic exposure to hypoxia.

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Hypoxia is a potent regulator of various biological process. Mammalian cells respond to hypoxia by increased expression of several genes. The aim of this study was to evaluate the effects of chronic exposure to low oxygen tension on the induction of inducible nitric oxide synthase (iNOS) and heme

Interaction between endothelial heme oxygenase-2 and endothelin-1 in altered aortic reactivity after hypoxia in rats.

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The aim of this study was to determine whether increased expression of heme oxygenase (HO) contributes to impairment of aortic contractile responses after hypoxia through effects on reactivity to endothelin-1 (ET-1). Thoracic aortas from normoxic rats and rats exposed to hypoxia (10% O2) for 16 or

Effects of hypoxia preconditioning on expression of metallothionein-1,2 and heme oxygenase-1 before and after kainic acid-induced seizures.

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Global hypoxia preconditioning provides neuroprotection against a subsequent, normally damaging challenge. While the mechanistic pathways are unknown, changes in the expression of stress-related proteins are implicated. Hypoxia preconditioning attenuates the brain edema and neuropathology associated

Delivery of Hypoxia-Inducible Heme Oxygenase-1 Gene for Site-Specific Gene Therapy in the Ischemic Stroke Animal Model.

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To reduce side effects due to non-specific expression, the heme oxygenase-1 (HO-1) gene under control of a hypoxia-inducible erythropoietin (Epo) enhancer (pEpo-SV-HO-1) was developed for site-specific gene therapy of ischemic stroke. pEpo-SV-HO-1 was constructed by insertion of the Epo enhancer

Heme oxygenase-1 ameliorates hypoxia/reoxygenation via suppressing apoptosis and enhancing autophagy and cell proliferation though Sirt3 signaling pathway in H9c2 cells.

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Cardiomyocyte infarction could lead to high morbidity and mortality worldwide. Recent studies demonstrated that Heme oxygenase-1 (HO-1) could exert cardiac protective effect and arouse attention. However, the detailed mechanism is still unclear. Our study provided evidences of the protective effect

Cerebral heme oxygenase 1 and 2 spatial distribution is modulated following injury from hypoxia-ischemia and middle cerebral artery occlusion in rats.

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The regional and cellular distribution of heme oxygenase (HO)-1 and -2 following cerebral ischemia has not been ascertained. Employing the transient middle cerebral artery occlusion (MCAO) and hypoxia-ischemia (HI) models of unilateral brain injury, the aim was to elucidate immunolocalization of

Expression of heme oxygenase-1 is repressed by interferon-gamma and induced by hypoxia in human retinal pigment epithelial cells.

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The retinal pigment epithelium (RPE) is essential for maintenance of photoreceptors and normally functions under conditions enriched with reactive oxygen species. RPE therefore expresses various defense enzymes against oxidative stress, including heme oxygenase-1 (HO-1). HO-1 catalyzes heme

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