phorbol ester/hypoxia

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Phorbol ester stimulates the nonhypoxic induction of a novel hypoxia-inducible factor 1alpha isoform: implications for tumor promotion.

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Hypoxia-inducible factor-1 (HIF-1), which is present at higher levels in human tumors, plays important roles in tumor promotion. It is composed of HIF-1alpha and HIF-1beta subunits and its activity depends on the amount of HIF-1alpha, which is tightly controlled by cellular oxygen tension. In

Phorbol esters stimulate muscle glucose transport by a mechanism distinct from the insulin and hypoxia pathways.

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Glucose transport in skeletal muscle can be stimulated by insulin and also by contractions and hypoxia. Activation of protein kinase C (PKC) stimulates glucose transport in muscle and other insulin-responsive cells. This study was performed to determine if the diacylglycerol (DAG)/phorbol

Delta protein kinase C interacts with the d subunit of the F1F0 ATPase in neonatal cardiac myocytes exposed to hypoxia or phorbol ester. Implications for F1F0 ATPase regulation.

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Mitochondrial protein kinase C isozymes have been reported to mediate both cardiac ischemic preconditioning and ischemia/reperfusion injury. In addition, cardiac preconditioning improves the recovery of ATP levels after ischemia/reperfusion injury. We have, therefore, evaluated protein kinase C

Phorbol ester alters rat hippocampal neuronal response to hypoxia.

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The effect of the protein kinase C (PKC) activator, 4 beta-phorbol-12, 13-dibutyrate (beta-PDBu) on electrophysiological properties of rat hippocampal CA1 neurons exposed to moderate hypoxia was examined. Hypoxic beta-PDBu-pretreated neurons differed from untreated neurons by exhibiting an

Phorbol ester alters the electrophysiological responses to hypoxia and ischemic-like conditions in the rat hippocampal slice.

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The effect of incubation with the protein kinase C activator, 4 beta-phorbol 12,13-dibutyrate (beta-PDBu) on the electrophysiological responses to hypoxia and combined hypoxia and hypoglycemia was investigated in the rat hippocampal slice. Preincubation with beta-PDBu prevents adenosine-mediated

Mapping of the vascular endothelial growth factor-producing hypoxic cells in multicellular tumor spheroids using a hypoxia-specific marker.

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We have investigated the hypoxia inducibility of vascular endothelial growth factor (VEGF) in multicellular tumor spheroids of HT29 cells using a monoclonal antibody to a fluorinated bioreductive drug, EF5 [2-(2-nitro-1H-imidazol-1-yl)-N-(2,2,3,3,3-pentafluoropropyl)aceta mide], a chemical probe for

[Effects of hypoxia on phosphoinositide turnover and adenylate cyclase system in cultured endothelial cells].

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By studying the effects of oxygen deficiency upon signal-transducing system it has been shown that in long hypobaric hypoxia activates PI-turnover in cultured human endothelial cells. The sensitivity of cells to histamine was decreased as well as the adenylate cyclase activity in membranes of this

Hypoxia-mediated impaired differentiation by LLC-PK1 cells: evidence based on the protein kinase C profile.

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We recently reported that mild hypoxia in LLC-PK1 cells, grown in standard fashion under a still layer of overlying medium at 5% CO2/18% O2 environment, result in decreased oxidative metabolism and impaired differentiated functions in comparison to adequately oxygenated cultures maintained either

Evidence that protein kinase Cepsilon mediates phorbol ester inhibition of calphostin C- and tumor necrosis factor-alpha-induced apoptosis in U937 histiocytic lymphoma cells.

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Protein kinase C (PKC) activators, such as the tumor-promoting phorbol esters, have been reported to protect several cell lines from apoptosis induced by a variety of agents. Recent evidence suggests that PKCepsilon is involved in protection of cardiac myocytes from hypoxia-induced cell death (Gray,

Phorbol ester-induced ventricular fibrillation in the Langendorff-perfused rabbit heart: antagonism by staurosporine and glibenclamide.

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Using a paced Lagendorff-perfused rabbit heart paradigm, we investigated the role of protein kinase C (PKC) in the development of ventricular fibrillation (VF) in hearts subjected to hypoxia (12 min) and re-oxygenation (40 min). We studied the effect of putative activators and inhibitors of PKC on

Influence of hypoxia/ischemia on cerebrovascular responses to oxytocin in piglets.

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We examined the effects of hypoxic/ischemic stress on cerebral arteriolar responses to oxytocin in anesthetized piglets. Pial arteriolar diameters were measured using a cranial window and intravital microscopy. First, we evaluated arteriolar responses to topical application of oxytocin during

Effect of hypoxia on the binding and subcellular distribution of iron regulatory proteins.

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Iron regulatory proteins 1 and 2 (IRP1, IRP2) are key determinants of uptake and storage of iron by the liver, and are responsive to oxidative stress and hypoxia potentially at the level of both protein concentration and mRNA-binding activity. We examined the effect of hypoxia (1% O(2)) on IRP1 and

Suppression of hypoxia-associated vascular endothelial growth factor gene expression by nitric oxide via cGMP.

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OBJECTIVE To investigate the suppressive effect of nitric oxide (NO) on vascular endothelial growth factor (VEGF) gene expression and to elucidate its mechanism of action. METHODS Immortalized human retinal epithelial (RPE) cells, H-ras-transfected murine capillary endothelial cells, and nuclear

Hypoxia-regulated activity of PKCepsilon in the lens.

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OBJECTIVE To show that hypoxia is necessary to prevent opacification of the lens. Protein kinase C (PKC)-epsilon serves a role that is distinct from PKC-gamma when both PKC isoforms are expressed in the lens. PKCepsilon serves a very important role in hypoxic conditions, helping to prevent

VEGF mRNA is reversibly stabilized by hypoxia and persistently stabilized in VEGF-overexpressing human tumor cell lines.

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Solid tumor growth is dependent upon angiogenesis, a process by which soluble factors released from a tumor induce the sprouting and growth of new blood vessels from nearby venules into the tumor. This process of tumor vascularization provides tumor cells with nutrients, oxygen, and an enhanced

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