Gene name: hypoxia inducible factor 1, alpha subunit (basic helix-loop-helix transcription factor)
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11571295
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This activation is mediated by an increase in accumulation of the HIF-1alpha protein through an ERK-dependent pathway.
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11571295
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Thus, stimulation of VEGF expression by Alb-AGE, through the activation of HIF-1, could play an important role in the development of diabetic retinopathy.
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12084725
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Gel shift assays with a (32)P-labeled leptin promoter -116/HRE probe and nuclear extracts from hypoxia-treated cells indicated binding of the HIF1alpha/beta heterodimer, which was blocked with an excess of unlabeled -116/HRE probe or a HIF1-binding probe from the erythropoietin gene enhancer.
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16506055
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As it is not known whether the effects of insulin on VEGF involve activation of hypoxia-inducible factor-1 (HIF-1), we aimed to evaluate: (1) whether insulin modulates HIF-1alpha protein synthesis and activity; (2) the insulin signalling pathways involved; and (3) the role of insulin resistance.
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16506055
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Using aortic VSMC taken from humans and Zucker rats and cultured in normoxia, the following were evaluated: (1) dose-dependent (0.5, 1, 2 nmol/l) and time-dependent (2, 4, 6 h) effects exerted by insulin on HIF-1alpha content in both nucleus and cytosol, measured by Western blots; (2) insulin effects on HIF-1 DNA-binding activity on the VEGF gene, measured by electrophoretic mobility shift assay; and (3) involvement of the insulin signalling molecules in these insulin actions, by using the following inhibitors: LY294002 (PI3-K), PD98059 (extracellular signal regulated kinase [ERK]), SP600125 (Jun N terminal kinase [JNK]), SB203580 (p38 mitogen-activated protein kinase) and rapamycin (mammalian target of rapamycin), and by detecting the insulin signalling molecules by Western blots.
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16506055
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In aortic VSMC from humans and Zucker fa/+ rats cultured in normoxia insulin increases the HIF-1alpha content in cytosol and nucleus via dose- and time-dependent mechanisms, and HIF-1 DNA-binding activity on the VEGF gene.
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16506055
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The insulin-induced increase of HIF-1alpha is blunted by the translation inhibitor cycloheximide, LY294002, PD98059, SP600125 and rapamycin, but not by SB203580.
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17049056
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Insulin secretion decreased on POD 3 in association with a significant increase of HIF-1alpha-related beta-cell death, which can be suppressed by short-term hyperbaric oxygen therapy.
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17049056
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In addition, significant activation of vascular endothelial growth factor in islet grafts on POD 7 correlated with development of massive newly formed microvessels, whose maturation is advanced on POD 14 with gradual diminution of HIF-1alpha.
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17072586
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Defective EPC mobilisation in diabetes was associated with altered release of SDF-1 and VEGF and inability to upregulate muscle HIF-1alpha.
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17229797
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To investigate the expression of the hypoxia-inducible factor-1alpha (HIF-1alpha) and the protein products of its target genes vascular endothelial growth factor (VEGF), erythropoietin (Epo) and angiopoietins (Angs), and the antiangiogenic pigment epithelium-derived factor (PEDF) in proliferative diabetic retinopathy (PDR) epiretinal membranes.
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17229797
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There were significant correlations between the number of blood vessels expressing the panendothelial marker CD34 and the numbers of blood vessels expressing HIF-1alpha (r = 0.554; p = 0.026), Ang-2 (r = 0.830; p<0.001) and VEGF (r = 0.743; p = 0.001).
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17586470
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Metallothionein (MT) is effective in the prevention of diabetic cardiomyopathy, and hypoxia-inducible factor-1 (HIF-1) is known to control vascular endothelial growth factor (VEGF) gene expression and regulate angiogenesis in diabetic hearts.
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17971008
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We provide evidence that Igf-1 regulates Hif-1alpha protein synthesis and activity during wound repair.
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17971009
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Reduction in Hif-1alpha levels results in decreased DNA-binding activity and in decreased expression of several Hif-1 target genes, including vascular endothelial growth factor, heme oxygenase-1, and inducible nitric oxide synthase.
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18322021
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These results suggest that the renoprotective effect of PEDF against diabetic nephropathy may be partially through its anti-inflammatory activity, likely by blocking the NF-kappaB and HIF-1 pathways.
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18835934
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We investigated the potential roles and intracellular mechanisms of angiopoietin-1 (Ang-1) gene therapy on myocardial HIF-1alpha stabilization and vascular maturation in db/db mice. db/db mice were systemically administrated adenovirus Ang-1 (Ad-CMV-Ang-1).
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18835934
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Ang-1 gene therapy causes a significant increase in Akt and eNOS expression and HIF-1alpha stabilization.
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18835934
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Taken together, our data show that Ang-1 increases myocardial vascular maturation and angiogenesis together with suppression of PHD2 and the upregulation of HIF-1alpha signaling.
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19845601
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Daily treatment of prostate cancer xenograft-bearing mice with low-dose anthracycline (doxorubicin or daunorubicin) chemotherapy inhibits HIF-1 DNA-binding activity, HIF-1-dependent expression of angiogenic growth factors, mobilization of circulating angiogenic cells, and tumor vascularization, thereby arresting tumor growth.
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20814070
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In rats with chronic ulcers, the mRNA expression of HIF-1alpha, IL-1beta and COX-2 was assessed by RT-PCR and protein expression of platelet endothelial cell adhesion molecule-1 (PECAM-1), COX-2 and cNOS was examined by Western blot.
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19996311
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Moreover, using echinomycin, a hypoxia-inducible factor 1 (HIF-1) inhibitor, and HIF-1alpha small interfering RNA, we demonstrate that insulin stimulates REDD1 expression only through the transcription factor HIF-1.
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20332345
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Overexpression of Nox4 increased basal level of ROS generation, HIF-1alpha, and VEGF expression in RCECs.
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20332345
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Moreover, inhibition of Nox4 attenuated hypoxia-induced upregulation of HIF-1alpha and high-glucose-elicited phosphorylation of STAT3.
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21873554
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Mice with adipocyte-specific targeted disruption of the genes encoding the HIF1 obligatory subunits Hif1? or Arnt (Hif1?) were generated using an aP2-Cre transgene with the Cre/LoxP system.
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21873554
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Inhibition of HIF1 in adipose tissue ameliorates obesity and insulin resistance.
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20676049
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In different cellular models where ATM expression was disrupted, we demonstrated that the absence of ATM leads to an increased expression of both subunits of the transcription factor Hypoxia Inducible Factor 1 (HIF-1).
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20676049
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In addition, our results suggest that the absence of ATM increases HIF-1 proteins biosynthesis, and this effect is dependant on the oxidative stress existing in ATM deficient cells.
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22055506
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Depletion of PCBP1 or PCBP2 in cells led to loss of PHD activity, manifested by reduced prolyl hydroxylation of HIF1?, impaired degradation of HIF1? through the VHL/proteasome pathway, and accumulation of active HIF1 transcription factor.
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