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Pàgina 1 des de 1663 resultats
Mechanism of increased tyrosine (Tyr(99)) phosphorylation of calmodulin during hypoxia in the cerebral cortex of newborn piglets: the role of nNOS-derived nitric oxide.
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The present study aims to investigate the mechanism of calmodulin modification during hypoxia and tests the hypothesis that hypoxia-induced increase in Tyr(99) phosphorylation of calmodulin in the cerebral cortex of newborn piglets is mediated by NO derived from nNOS. Fifteen piglets were divided
Hypoxia- or PDGF-BB-dependent paxillin tyrosine phosphorylation in pulmonary hypertension is reversed by HIF-1α depletion or imatinib treatment.
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Chronic exposure to hypoxia induces a pronounced remodelling of the pulmonary vasculature leading to pulmonary hypertension (PH). The remodelling process also entails increased proliferation and decreased apoptosis of pulmonary arterial smooth muscle cells (PASMC), processes regulated by the
Hypoxia regulates vascular endothelial growth factor and soluble fms-like tyrosine kinase-1 secretion by human oviductal epithelial cells and stromal fibroblasts.
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OBJECTIVE
To evaluate the effect of hypoxia on the production of vascular endothelial growth factor (VEGF) and soluble fms-like tyrosine kinase-1 (sFlt-1) in the human fallopian tube.
METHODS
The secretion of VEGF and sFlt-1 by cultured oviductal epithelial cells (OECs) and oviductal stromal
Regulation of gene expression for tyrosine hydroxylase in oxygen sensitive cells by hypoxia.
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Carotid body type I cells and the O2 sensitive pheochromocytoma (PC12) cells release dopamine during hypoxia. Reduced O2 tension causes inhibition of an outward rectifying the O2-sensitive potassium (K) channel in the O2-sensitive pheochromocytoma (PC12) cell line, which leads to membrane
Hypoxia and hypoxia/reoxygenation activate Src family tyrosine kinases and p21ras in cultured rat cardiac myocytes.
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We previously reported that both hypoxia and hypoxia followed by reoxygenation (hypoxia/reoxygenation) rapidly and sequentially activate mitogen-activated protein kinase kinase kinase (MAPKKK) activity of Raf-1. This was followed by the sequential activation of MAP kinase kinase (MAPKK). MAP kinases
Neonatal stress: effects of hypoglycemia and hypoxia on adrenal tyrosine hydroxylase gene expression.
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Catecholamines (CA) are released from and resynthesized in the adrenal medulla in response to stress. In the mature animal, stimulus-secretion-synthesis coupling occurs through transsynaptic (neuronal) activity. In contrast, in the immature animal, before functional adrenal innervation, certain
Delayed increase of tyrosine hydroxylation in the rat A2 medullary neurons upon long-term hypoxia.
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In vivo and in vitro activity of tyrosine hydroxylase (TH) was estimated in the catecholaminergic A2 cell group of the nucleus tractus solitarius (NTS) in rats exposed to normobaric hypoxia (10% O2 in nitrogen) for 2 h, 3, 7, 14 or 21 days. The A2 cell group was subdivided into two subgroups. In the
Pattern-specific sustained activation of tyrosine hydroxylase by intermittent hypoxia: role of reactive oxygen species-dependent downregulation of protein phosphatase 2A and upregulation of protein kinases.
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We investigated the role of protein phosphatases (PP) and protein kinases in tyrosine hydroxylase (TH) activation by two patterns of intermittent hypoxia (IH) in rat brainstem. Rats exposed to either IH(15s) (15 s, 5% O(2); 5 min, 21%O(2)) or IH(90s) (90 s each of 10% O(2) & 21%O(2)) for 10 days
Hypoxia followed by re-oxygenation induces oxidation of tyrosine phosphatases.
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Hypoxia and hypoxia/reoxygenation (H/R) are components of tissue ischemia and reperfusion implicated in myocardial infarction, organ transplantation, and tumor perfusion. H/R enhances production of reactive oxygen species (ROS). Candidate molecular targets of ROS are the catalytic site cysteine of
Screening of anti-hypoxia/reoxygenation agents by an in vitro model. Part 1: Natural inhibitors for protein tyrosine kinase activated by hypoxia/reoxygenation in cultured human umbilical vein endothelial cells.
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Protein tyrosine kinase (PTK) signaling pathways play important roles in ischemia/reperfusion (I/R) or hypoxia/reoxygenation (H/R) injuries. Inhibition of PTK activation can protect against I/R- or H/R-induced damages. As one part of our work for seeking bioactive compounds from natural sources
Effect of hypoxia on protein tyrosine kinase activity in cortical membranes of newborn piglets--the role of nitric oxide.
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Previous studies have shown that cerebral hypoxia results in increased tyrosine phosphorylation of cerebral cortical cell membrane proteins as well as nuclear membrane anti-apoptotic protein, Bcl-2. The present study tests the hypothesis that hypoxia results in increased protein tyrosine kinase
Protein tyrosine kinase regulates α-amino-3-hydroxy-5-methyl-4-isoxazolepropionic acid (AMPA) receptor trafficking induced by acute hypoxia in cultured brainstem neurons.
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This study was performed to investigate the modulation effect of protein tyrosine kinase on postsynaptic a-amino-3-hydroxy-5-methyl-4-isoxazolepropionic acid (AMPA) receptor trafficking induced by acute hypoxia in cultured brainstem neurons. The cultured neurons were exposed to 1% O2 and the
Role of c-fos in hypoxia-induced AP-1 cis-element activity and tyrosine hydroxylase gene expression.
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Previous studies have demonstrated that hypoxia stimulates expression of the c-fos gene in intact animals and isolated cells. The purpose of the present study was to assess the functional significance of c-fos activation during hypoxia. Using antisense c-fos strategy, we tested the hypothesis that
Short-term hypoxia increases tyrosine hydroxylase immunoreactivity in rat carotid body.
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Neurochemical and morphological changes in the carotid body are induced by chronic hypoxia, leading to regulation of ventilation. In this study, we examined the time courses of changes in immunohistochemical intensity for tyrosine hydroxylase (TH) and cellular volume of glomus cells in rats exposed
The endothelial receptor tyrosine kinase tie-1 is upregulated by hypoxia and vascular endothelial growth factor.
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The receptor tyrosine kinase tie-1 is essential for angiogenesis where it appears to have a role in vessel maturation. Here we have examined the effects of hypoxia and vascular endothelial growth factor (VEGF) on the level of tie-1 protein expressed in bovine aortic endothelial cells. Both hypoxia
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