hydroquinone/hypoxia

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[Effect of ascorbic acid during acute iterative anoxia, hypothesis of an anti-oxidizing mechanism of action in comparison with the effect of hydroquinone].

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Some of the problems which appear during senescence, are said to be caused by cerebral oxygen deficiency and various experiments have been set up to try to imitate this particular aspect of the ageing process. We have already studied the action of many drugs with regard to acute repeated anoxia. Our

[Use of electronacceptory properties of hydroquinone for the prevention and therapy of oxygen deficiency].

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Indolequinone bioreductive drugs: kinetic factors which influence selectivity for hypoxia.

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The factors influencing the kinetics of the oxygen-sensitive reduction of indolequinones, including those bearing leaving groups in the (indol-3-yl)methyl position, have been studied. The hydroquinones derived from some representative indolequinones were found to autoxidize slowly in oxygenated

Indolequinone antitumor agents: reductive activation and elimination from (5-methoxy-1-methyl-4,7-dioxoindol-3-yl)methyl derivatives and hypoxia-selective cytotoxicity in vitro.

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A series of indolequinones bearing a variety of leaving groups at the (indol-3-yl)methyl position was synthesized by functionalization of the corresponding 3-(hydroxymethyl)indolequinone, and the resulting compounds were evaluated in vitro as bioreductively activated cytotoxins. The elimination of a

Iridium(III) Anthraquinone Complexes as Two-Photon Phosphorescence Probes for Mitochondria Imaging and Tracking under Hypoxia.

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In the present study, four mitochondria-specific and two-photon phosphorescence iridium(III) complexes, Ir1-Ir4, were developed for mitochondria imaging in hypoxic tumor cells. The iridium(III) complex has two anthraquinone groups that are hypoxia-sensitive moieties. The phosphorescence of the

Loss of endothelium-dependent relaxant activity in the pulmonary circulation of rats exposed to chronic hypoxia.

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To determine whether exposure to chronic hypoxia and subsequent development of pulmonary hypertension induces alterations of endothelium-dependent relaxation in rat pulmonary vascular bed, we studied isolated lung preparations from rats exposed to either room air (controls) or hypoxia (H) during 1

Augmentation of hypoxic pulmonary vasoconstriction in the isolated perfused rat lung by in vitro antagonists of endothelium-dependent relaxation.

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The role of the endothelium in hypoxic constriction of the intact pulmonary vascular bed has not been clearly elucidated. To test for a possible role for endothelium-derived relaxing factor(s) (EDRF) in the hypoxic pressor response, isolated, whole blood-perfused rat lungs from male Sprague-Dawley

Cross-resistance in Gulf killifish (Fundulus grandis) populations resistant to dioxin-like compounds.

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The Houston Ship Channel (HSC) in Houston, Texas is an aquatic environment with a long history of contamination, including polychlorinated dibenzodioxins (PCDD), polychlorinated dibenzofurans (PCDF), polychlorinated biphenyls (PCBs), polycyclic aromatic hydrocarbons (PAHs), and heavy metals.

Biotransformation of geldanamycin and 17-allylamino-17-demethoxygeldanamycin by human liver microsomes: reductive versus oxidative metabolism and implications.

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Comparative metabolite profiling of geldanamycin and 17-allylamino-17-demethoxygeldanamycin (17AAG) using human liver microsomes in normoxia and hypoxia was conducted to understand their differential metabolic fates. Geldanamycin bearing a 17-methoxy group primarily underwent reductive metabolism,

Adenosine 5'-triphosphate, adenosine and endothelium-derived relaxing factor in hypoxic vasodilatation of the heart.

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The involvement of ATP in hypoxic vasodilatation was investigated using isolated perfused guinea-pig hearts (Langendorff). Reactive blue 2, a selective P2Y-purinoceptor antagonist, attenuated dilatations due to ATP and hypoxia. Hydroquinone, an agent which destroys endothelium-derived relaxing

Role of endothelium in hypoxic contraction of canine basilar artery.

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1. Reversible contraction of canine basilar artery, produced by hypoxia, persisted after mechanical and chemical removal of the endothelium. The removal of endothelium was confirmed by scanning electron microscopy as well as by the abolition or reversal of the relaxant response to acetylcholine or

[Antihypoxic effects of quinones connected with restoration of electro-transport and function of the respiratory chain of the isolated rat heart].

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The effect of hypoxia of middle severity (H50) has been investigated on the contractile activity, oxidative metabolism and bioenergetic function of the myocardium in the isolated rat heart. It has been shown that differences in the functional-metabolic parameters sensitivity in the resistant and

Advancements in Free-Radical Pathologies and an Important Treatment Solution with a Free-Radical Inhibitor.

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Unsaturated carbon-carbon double bonds particularly at exposed end groups of nonsolid fluids are susceptible to free-radical covalent bonding on one carbon atom creating a new free radical on the opposite carbon atom. Subsequent reactive secondary sequence free-radical polymerization can then

Activation of NQO-1 mediates the augmented contractions of isolated arteries due to biased activity of soluble guanylyl cyclase in their smooth muscle.

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Earlier studies on isolated arteries demonstrated that the para-quinone thymoquinone, like acute hypoxia, induces augmentation of contractions, depending on biased activity of soluble guanylyl cyclase (sGC), generating inosine-3',5'-cyclic monophosphate (cyclic IMP) rather than

Quinone bioreductive prodrugs as delivery agents.

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Quinone bioreductive prodrugs were developed to target the hypoxic or the reductase- rich population of solid tumours. The mechanism of their selective activation is based on their ability to convert the quinone sub-structure to their activated semiquinone or hydroquinone species affording the

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