fluoride/hypoxia

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[The mechanism of circulatory hypoxia in acute with sodium fluoride poisoning].

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Intraperitoneal injection of a 1-sodium fluoride solution (35--40 mg/kg) to male rats was seen to cause a 8--9 fold rise of the blood histamine content and to significantly lower the oxygen tension in the musculus femorins. Preliminary administration of diprazine (5 mg/kg) prevented the death of the

Sodium fluoride induces apoptosis through the downregulation of hypoxia-inducible factor-1α in primary cultured rat chondrocytes.

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It has been reported that sodium fluoride (NaF) suppresses the proliferation and induces apoptosis of chondrocytes. However, the cellular and molecular mechanisms of the effect have not been elucidated. Therefore, the aim of this study was to evaluate the mechanisms of the effects of NaF on primary

Hypoxia and halothane metabolism in vivo: release of inorganic fluoride and halothane metabolite binding to cellular constituents.

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Fluoride release and covalent binding of halothane metabolites were studied in rats pretreated with phenobarbital and anesthestized with halothane in the presence of high (40 per cent) and low (7 per cent) oxygen tensions. The purpose of producing hypoxia was to promote the reductive pathways

[The effect of 2,4-dinitrophenol, monoiodine acetate, sodium fluoride and hypoxia on the formation of plasma polyps in the placenta of guinea pigs (author's transl)].

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Plasma polyps can be found at the end of a normal pregnancy. Following NaF and MJA-intoxication, there is an extreme increase of plasma polyps. This accelerated formation can be prevented by the injection of Na-pyruvate and often the number of polyps can be reduced below the norm. 2,4-Dinitrophenol

Automated radiosynthesis of GMP quality [18F]HX4 for PET imaging of hypoxia.

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BACKGROUND [(18)F]HX4 is a 2-nitroimidazole based investigational radiotracer for imaging hypoxia. METHODS A two-step, one-pot synthetic procedure was developed on a GE Tracerlab MX-FDG with a disposable cassette. Nucleophilic substitution of a nosylate group with [(18)F]fluoride was followed by

Changes in metabolite levels and morphology of teleost ventricular myocytes due to hypoxia, ischaemia, and metabolic inhibitors.

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Since fish hearts are resistant to the effects of hypoxia, comparison of the effects of hypoxia and ischaemia on fish and mammalian hearts may lead to better understanding of ischaemic injury in mammalian hearts. The ultrastructure and levels of ATP, creatine phosphate, and lactic acid were examined

Synthesis of [18F]fluoroetanidazole: a potential new tracer for imaging hypoxia.

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A method has been developed for the synthesis of [18F]fluoroetanidazole, a potential tracer for imaging hypoxia with positron emission tomography. The compound is prepared by an active ester coupling reaction between the 2,3,5,6-tetrafluorophenyl ester of 2-nitroimidazole acetic acid and

Altered myocardial Gs protein and adenylyl cyclase signaling in rats exposed to chronic hypoxia and normoxic recovery.

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The present work has analyzed the consequences of chronic intermittent high-altitude hypoxia for functioning of the G protein-mediated adenylyl cyclase (AC) signaling system in the right (RV) and left ventricular (LV) myocardium in rats. Adaptation to hypoxia did not appreciably affect the number of

Synthesis and preclinical characterization of 1-(6'-deoxy-6'-[18F]fluoro-β-d-allofuranosyl)-2-nitroimidazole (β-6'-[18F]FAZAL) as a positron emission tomography radiotracer to assess tumor hypoxia.

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Positron emission tomography (PET) using fluorine-18 (18F)-labeled 2-nitroimidazole radiotracers has proven useful for assessment of tumor oxygenation. However, the passive diffusion-driven cellular uptake of currently available radiotracers results in slow kinetics and low tumor-to-background

Respective roles of hypoxia and halothane metabolism in halothane-induced liver injury in rats.

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To evaluate the respective roles of halothane metabolism and hypoxia in rats with halothane hepatotoxicity, experiments were designed with special reference to blood gas. After pretreatment with phenobarbital (80 mg per kg., i.p.) for four consecutive days, rats were exposed to 1.0% halothane under

Nicorandil enhances the effect of endothelial nitric oxide under hypoxia-reoxygenation: role of the KATP channel.

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Nicorandil increased the anti-platelet aggregation activity of endothelial cells when endothelial cells were exposed to hypoxia-reoxygenation conditions. However, nicorandil (0.1-10 muM) did not inhibit platelet aggregation directly. The mechanism by which nicorandil increases the anti-aggregation

Induction of a heat shock puff by hypoxia in polytene foot pad chromosomes of Sarcophaga bullata.

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The single large heat-responsive puff (hs puff) in polytene foot pad cells of fly pupae (Sarcophaga bullata) is shown to be inducible by oxygen deprivation but not, as in other systems, by reoxygenation following an hypoxic treatment. The ambient oxygen concentration must drop below 2% for the hs

Effects of prolonged hypoxia on adenylate cyclase activity and beta-adrenergic receptors in pulmonary and systemic arteries of the rat.

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Prolonged hypoxia causes pulmonary hypertension but no change in systemic vasomotor tone. In an effort to define the mechanisms involved, we determined the effects of 3 and 7 days of hypoxia on adenylate cyclase activity and beta-adrenergic receptor binding characteristics in pulmonary and systemic

Chronic hypoxia increases beta 1-adrenergic receptor mRNA and density but not signaling in neonatal rat cardiac myocytes.

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BACKGROUND It is well recognized that the beta-adrenergic receptor-adenylylcyclase system is altered during myocardial ischemia/hypoxia. However, there are no data regarding either regulation of beta-adrenergic receptors, particularly at the mRNA level, or adenylylcyclase activity in isolated

[Seasonal fluctuations in fluoride content in waters of the Warta oxbow lake in Luboń].

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Studies were carried out in 2002-2003 at the Department of Inland Fishing and Aquaculture, Agricultural University of Poznań, on seasonal fluctuations in fluoride content in waters of the Warta oxbow lake in Luboń (52 degrees 19' N, 16 degrees 53' E). This reservoir has been loaded during several

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