Linked Life Data

16041620

Source:http://linkedlifedata.com/resource/pubmed/id/16041620

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pubmed-article:16041620pubmed:abstractTextThe hypoxia-inducible factor (HIF)-1 is a master transcriptional activator of oxygen-regulated genes involved in energy metabolism, angiogenesis, and erythropoiesis. HIF-1 is composed of the two subunits HIF-1alpha and HIF-1beta (also called ARNT). The destruction of HIF-1alpha in the presence of oxygen is initiated by prolyl-4-hydroxylation. In human cells three closely related prolyl hydroxylases (PHDs) have been identified. An age-dependent decrease in HIF-1alpha expression was reported previously in brain, liver and kidney, which may be associated with a reduced adaptation to hypoxia as found in aged animals and humans. We have determined the expression of HIF-1alpha and the PHDs in human atrial trabeculae under normoxic and hypoxic conditions, in samples of human left ventricles as well as in heart extracts from female mice of different age (5 up to 16 months). With increasing age we found a decreased expression of HIF-1alpha, which correlated to an increased PHD3 expression in mouse and human heart. PHD3 was the most prominent HIF modifying hydroxylase found in human heart samples. Additionally, we found a strong ischemia/hypoxia-inducibility of PHD3 compared to PHD1 and PHD2 in atrial trabeculae. These data may explain the previously reported reduction of HIF-1alpha and HIF-1 target genes such as the vascular endothelial growth factor in ageing tissue.lld:pubmed
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pubmed-article:16041620pubmed:pagination165-71lld:pubmed
pubmed-article:16041620pubmed:dateRevised2006-11-15lld:pubmed
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pubmed-article:16041620pubmed:articleTitleAge-dependent increase of prolyl-4-hydroxylase domain (PHD) 3 expression in human and mouse heart.lld:pubmed
pubmed-article:16041620pubmed:affiliationInstitute of Pathophysiology, Martin-Luther University Halle, Germany.lld:pubmed
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pubmed-article:16041620pubmed:publicationTypeResearch Support, Non-U.S. Gov'tlld:pubmed
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