Hypoxia-inducible factor 1 (HIF-1) is a global regulator of cellular and systemic O(2) homeostasis in animals. A molecular basis for O(2)-regulated expression of the HIF-1 alpha subunit has now been determined, providing a mechanism for changes in gene expression in response to changes in cellular oxygenation.

Purpose: To investigate the role of dexmedetomidine in gastric ischemia/reperfusion injury using mucosal epithelial cell (GES-1) model.
 Methods: GES-1 were subjected to oxygen-glucose deprivation conditions, followed by increasing concentrations (0.5, 1.0, or 1.5 μM) for 4 h reoxygenation. Cell viability and apoptosis determined 3-(4,5-dimethylthiazol-2-yl)-2,5-diphenyl-2H-tetrazolium bro...

Semenza, Gregg L. O2-regulated gene expression: transcriptional control of cardiorespiratory physiology by HIF-1. J Appl Physiol 96: 1173–1177, 2004; 10.1152/japplphysiol.00770.2003.—The cardiovascular and respiratory systems play key roles in O2 homeostasis. Physiological responses to hypoxia involve changes in gene expression that are mediated by the transcriptional activator hypoxia-inducibl...

To explore the effect and molecular mechanism of total flavonoids Astragalus on apoptosis inflammation alveolar epithelial cells induced by tumor necrosis factor alpha. Human were divided into control group, alpha alpha+trifluoroacetic acid-low, acid-medium, acid-high alpha+anti-microRNA-NC alpha+microRNA-221 inhibitor acid-high+microRNA-NC acid-H+microRNA-221 mimic group. Real-time fluorescenc...

BACKGROUND Response gene to complement 32 (RGC-32) is induced by activation of complement and regulates cell proliferation. To determine the mechanism of RGC-32 in angiogenesis, we examined the role of RGC-32 in hypoxia-related endothelial cell function. METHODS AND RESULTS Hypoxia/ischemia is able to stimulate both angiogenesis and apoptosis. Hypoxia-inducible factor-1/vascular endothelial g...

The kidney is vulnerable to hypoxia-induced injury. One of the mechanisms underlying this phenomenon is cell apoptosis triggered by hypoxia-inducible factor-1-alpha (HIF-1α) activation. MicroRNA-210 (miR-210) is known to be induced by HIF-1α and can regulate various pathological processes, but its role in hypoxic kidney injury remains unclear. Here, in both kinds of rat systemic hypoxia and loc...

The cardiovascular and respiratory systems play key roles in O(2) homeostasis. Physiological responses to hypoxia involve changes in gene expression that are mediated by the transcriptional activator hypoxia-inducible factor (HIF)-1. Analysis of mice heterozygous for a knockout allele at the locus encoding the O(2)-regulated HIF-1alpha or HIF-2alpha subunit has revealed that these proteins are ...

Sodium 4-phenylbutyrate (4-PBA) is a low molecular weight fatty acid that has been used for treatment of urea cycle disorders in children, sickle cell disease, and thalassemia. It has been demonstrated recently that 4-PBA can act as a chemical chaperone by reducing the load of mutant or mislocated proteins retained in the endoplasmic reticulum (ER) under conditions associated with cystic fibros...

Tissue hypoxia not only occurs under pathological conditions but is also an important microenvironmental factor that is critical for normal embryonic development. Hypoxia-inducible factors HIF-1 and HIF-2 are oxygen-sensitive basic helix-loop-helix transcription factors, which regulate biological processes that facilitate both oxygen delivery and cellular adaptation to oxygen deprivation. HIFs ...