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guanylate cyclase inhibitor/hypoxie
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A role for nitric oxide in hypoxia-induced activation of cardiac KATP channels in goldfish (Carassius auratus).
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Hypoxia-induced shortening of cardiac action potential duration (APD) has been attributed in mammalian hearts to the activation of ATP-sensitive potassium (KATP) channels. Since KATP channels are also present at high densities in the hearts of vertebrate ectotherms, speculation arises as to their
Role of Ca2+ entry in the modulation of airway tone by hypoxia.
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To evaluate the cellular mechanisms involved in hypoxic relaxation of airway smooth muscle, we investigated the effects of hypoxia on the behavior of third- and fourth-order porcine bronchial rings contracted with either carbachol or KCl. In one series of experiments, hypoxia (95% N2-5% CO2) was
Characterization of endothelium- dependent relaxation in guinea pig basilar artery - effect of hypoxia and role of cytochrome P450 mono-oxygenase.
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In the guinea pig basilar artery, acetylcholine and the calcium ionophore A23187 induced endothelium-dependent relaxations, which were not significantly affected by the nitric oxide (NO) synthase inhibitor Nomega-nitro-L-arginine (L-NOARG; 0.3 mM) or the guanylate cyclase inhibitor ODQ
A phosphodiesterase-5 inhibitor vardenafil enhances angiogenesis through a protein kinase G-dependent hypoxia-inducible factor-1/vascular endothelial growth factor pathway.
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OBJECTIVE
We examined whether phosphodiesterase-5 (PDE5) inhibition can promote ischemia-induced angiogenesis.
RESULTS
Unilateral hindlimb ischemia was generated by resecting right femoral artery in wild-type C3H/He mice, treated with either vehicle or a PDE5 inhibitor vardenafil (10 mg/kg per day).
Hypoxia-augmented constriction of deep femoral artery mediated by inhibition of eNOS in smooth muscle.
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In contrast to the conventional belief that systemic arteries dilate under hypoxia, we found that α-adrenergic contraction of rat deep femoral artery (DFA) is largely augmented by hypoxia (HVC(DFA)) while hypoxia (3% Po(2)) alone had no effect. HVC(DFA) was consistently observed in both
L-arginine protects human heart cells from low-volume anoxia and reoxygenation.
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Protective effects of L-arginine were evaluated in a human ventricular heart cell model of low-volume anoxia and reoxygenation independent of alternate cell types. Cell cultures were subjected to 90 min of low-volume anoxia and 30 min of reoxygenation. L-Arginine (0-5.0 mM) was administered during
Sodium ferulate attenuates anoxia/reoxygenation-induced calcium overload in neonatal rat cardiomyocytes by NO/cGMP/PKG pathway.
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Development of intracellular calcium overload is an important pathophysiological factor in myocardial ischemia/reperfusion or anoxia/reoxygenation injury. Recent studies have shown that Sodium Ferulate (SF) stimulates nitric oxide (NO) production and exerts a cardioprotective effect in the
Endothelium-derived nitric oxide-dependent response to hypoxia in piglet intrapulmonary arteries.
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The purpose of this study was to determine the involvement of eicosanoids and nitric oxide (NO) in the response to hypoxia in isolated intrapulmonary (third branch) arteries from 10- to 17-day-old piglets. We also compared the response to hypoxia in pulmonary arteries to pulmonary veins, mesenteric
Cardioprotective effect of angiotensin-converting enzyme inhibition against hypoxia/reoxygenation injury in cultured rat cardiac myocytes.
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BACKGROUND
Although ACE inhibitors can protect myocardium against ischemia/reperfusion injury, the mechanisms of this effect have not yet been characterized at the cellular level. The present study was designed to examine whether an ACE inhibitor, cilazaprilat, directly protects cardiac myocytes
Dilator effect of endothelins in pulmonary circulation: changes associated with chronic hypoxia.
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To investigate dilator effects of endothelins (ETs) on the pulmonary circulation and possible changes induced by chronic hypoxia, we examined vascular responses to ET-1 and ET-3 as well as ET binding to receptor subtypes ETA and ETB in the lungs from rats exposed to either room air (controls),
Relationship between nitric oxide and opioids in hypoxia-induced pial artery vasodilation.
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It has previously been observed that nitric oxide (NO) and the opioids Met- and Leu-enkephalin contribute to hypoxia-induced pial artery dilation in the newborn pig. The present study was designed to investigate the relationship between NO and opioids in hypoxic pial dilation. Piglets equipped with
Impaired vasoconstriction and nitric oxide-mediated relaxation in pulmonary arteries of hypoxia- and monocrotaline-induced pulmonary hypertensive rats.
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Pulmonary hypertension (PH) is a life-threatening disease with unclear vascular mechanisms. We tested whether PH involves abnormal pulmonary vasoconstriction and impaired vasodilation. Male Sprague-Dawley rats were exposed to hypoxia (9% O(2)) for 2 weeks or injected with single dose of
Prior episode of anoxia attenuates vasorelaxation in response to subsequent episode of anoxia.
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To examine the effect of a prior episode of anoxia on subsequent anoxia-mediated vasorelaxation, norepinephrine-precontracted endothelium-intact rat aortic rings were first exposed to anoxia (95% N2-5% CO2 for 5, 15, or 30 min) then to normoxia (95% O2-5% CO2 for 15 min). These rings were exposed
Apoptosis induction of poly-S-nitrosated human serum albumin in resistant solid tumor under hypoxia can be restored by phosphodiesterase 5 inhibition.
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Poly-S-nitrosated human serum albumin (Poly-SNO-HSA) delivered and accumulated nitric oxide (NO) in tumors and induces apoptosis. Tumor hypoxia is strongly associated with malignant progression and tumor resistance to therapy. In this study, we examined the cytotoxic effect of Poly-SNO-HSA under
Hypoxia response element of the human vascular endothelial growth factor gene mediates transcriptional regulation by nitric oxide: control of hypoxia-inducible factor-1 activity by nitric oxide.
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Nitric oxide (NO) regulates production of vascular endothelial growth factor (VEGF) by normal and transformed cells. We demonstrate that NO donors may up-regulate the activity of the human VEGF promoter in normoxic human glioblastoma and hepatoma cells independent of a cyclic guanosine
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