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Sivu 1 alkaen 530 tuloksia
Activation of endothelial NO synthase by a xanthine derivative ameliorates hypoxia-induced apoptosis in endothelial progenitor cells.
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OBJECTIVE
Endothelial damage is strongly associated with cardiovascular diseases such as atherosclerosis, thrombosis and hypertension. Endothelial progenitor cells (EPCs) are primitive bone marrow (BM) cells that possess the capacity to mature into endothelial cells and play a role in
Xanthine oxidase-derived ROS upregulate Egr-1 via ERK1/2 in PA smooth muscle cells; model to test impact of extracellular ROS in chronic hypoxia.
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Exposure of newborn calves to chronic hypoxia causes pulmonary artery (PA) hypertension and remodeling. Previous studies showed that the redox-sensitive transcription factor, early growth response-1 (Egr-1), is upregulated in the PA of chronically hypoxic calves and regulates cell proliferation.
Effects of adenosine and xanthine derivatives on breathing during acute hypoxia in the anesthetized newborn piglet.
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Neonates of animals and humans exhibit a paradoxical ventilatory response to hypoxia characterized by an initial increase in minute ventilation followed by a late, sustained decrease. Exogenous adenosine analogues cause respiratory depression, and the xanthine derivative aminophylline, a competitive
Differential regulation of xanthine and NAD(P)H oxidase by hypoxia in human umbilical vein endothelial cells. Role of nitric oxide and adenosine.
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OBJECTIVE
Although in tissue injury following hypoxia/reoxygenation (H/R) an increased endothelial formation of superoxide anions (O(2)(-)) plays an important role, it is still not fully understood which of the potential enzymatic sources of endothelial O(2)(-) are crucially involved. In this study,
Phosphorylation of xanthine dehydrogenase/oxidase in hypoxia.
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The enzyme xanthine oxidase (XO) has been implicated in the pathogenesis of several disease processes, such as ischemia-reperfusion injury, because of its ability to generate reactive oxygen species. The expression of XO and its precursor xanthine dehydrogenase (XDH) is regulated at pre- and
TcO(PnA.O-1-(2-nitroimidazole)) [BMS-181321], a new technetium-containing nitroimidazole complex for imaging hypoxia: synthesis, characterization, and xanthine oxidase-catalyzed reduction.
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A technetium(V)oxo nitroimidazole complex that shows promise for imaging regional hypoxia in vivo, [BMS-181321, TcO(PnAO-1-(2-nitroimidazole))] (1) was prepared from 3,3,9,9-tetramethyl-1-(2-nitro-1H-imidazol-1-yl)-4,8-diazaundecane -2,10-dione dioxime, a 2-nitroimidazole-containing derivative of
The measurement of hypoxanthine, xanthine, inosine and uridine in umbilical cord blood and fetal scalp blood samples as a measure of fetal hypoxia.
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Hypoxanthine, xanthine, inosine, urate and uridine, were measured in 149 samples of umbilical cord plasma using high pressure liquid chromatography. In spite of a good correlation with the simpler oxygen consumption method for measuring hypoxanthine, there was no clear discrimination between hypoxic
Role of xanthine oxidase and its inhibitor in hypoxia: reoxygenation injury.
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OBJECTIVE
This article reviews the biochemistry and function of xanthine dehydrogenase (XDH) and xanthine oxidase (XO) as well as their role in hypoxia-reoxygenation injury. Possible benefits of XO blockade are discussed.
METHODS
The available literature was reviewed.
RESULTS
It is evident that
Hypoxanthine, xanthine, and uric acid in newborn pigs during hypoxemia followed by resuscitation with room air or 100% oxygen.
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OBJECTIVE
To determine if resuscitation with room air is as effective as resuscitation with an FIO2 of 1.0.
METHODS
Prospective, randomized laboratory study.
METHODS
Experimental laboratory (neonatal or delivery ward).
METHODS
Twenty piglets, 1 to 2 wks of age.
METHODS
Piglets were randomized into
Hypoxanthine, xanthine, and uric acid concentrations in plasma, cerebrospinal fluid, vitreous humor, and urine in piglets subjected to intermittent versus continuous hypoxemia.
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Infants with sudden infant death syndrome have higher hypoxanthine (Hx) concentrations in their vitreous humor than infants with respiratory distress syndrome and other infant control populations. However, previous research on piglets and pigs applying continuous hypoxemia has not been able to
Avian vitreous humor concentrations of inosine, hypoxanthine, xanthine, uric acid, uracil and uridine as influenced by age and sex: their relevance as indicators of ante-mortem hypoxia.
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An investigation was made to determine the effects of age and sex on postmortem concentrations (mumol/l) of inosine, hypoxanthine, xanthine, uric acid, uracil and uridine in the vitreous humor of chickens (Gallus domesticus). Five male and 5 female chickens were sampled each week from 0-10 weeks of
Cyclin-dependent kinase five mediates activation of lung xanthine oxidoreductase in response to hypoxia.
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BACKGROUND
Xanthine oxidoreductase (XOR) is involved in oxidative metabolism of purines and is a source of reactive oxygen species (ROS). As such, XOR has been implicated in oxidant-mediated injury in multiple cardiopulmonary diseases. XOR enzyme activity is regulated, in part, via a
Rapid conversion to high xanthine oxidase activity in viable Kupffer cells during hypoxia.
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It has been widely postulated that the central mechanism of hepatic reperfusion injury involves the conversion, during ischemia, of the enzyme xanthine dehydrogenase (XDH) to its free radical-producing form, xanthine oxidase (XOD). However, this theory has been questioned because (a) XDH to XOD
Conversion of xanthine dehydrogenase to xanthine oxidase as a possible marker for hypoxia in tumours and normal tissues.
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The enzyme activities of endogenous xanthine dehydrogenase (XDH) and xanthine oxidase (XO) have been measured in 10 different types of mouse tumour and seven normal tissues. The conversion of XDH to XO has been observed in two tumour types upon the prolonged clamping off of the blood supply to the
Plasma xanthine oxidase activity correlates with the resistance to severe hypoxia in different species.
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A rapid polarographic method of measuring the O-form of xanthine oxidase (XOD) is described. Activities of this enzyme and oxypurine concentrations were measured in the plasma and cerebrospinal fluid (CSF) of 1, 12, 25 and 60-day-old rats. In the CSF, the highest oxypurine concentration was found in
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