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Hif-1 alpha

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https://www.readbyqxmd.com/read/27902314/newcastle-disease-virus-degrades-hif-1%C3%AE-through-proteasomal-pathways-independent-of-vhl-and-p53
#1
Noraini Abd-Aziz, Eric Stanbridge, Norazizah Shafee
Newcastle disease virus (NDV) is a candidate agent for oncolytic virotherapy. Despite its potential, the exact mechanism of its oncolysis is still not known. Recently, we reported that NDV exhibited an increased oncolytic activity in hypoxic cancer cells. These types of cells negatively affect therapeutic outcome by overexpressing pro-survival genes under the control of the hypoxia-inducible factor (HIF). HIF-1 is a heterodimeric transcriptional factor consisting of a regulated alpha (HIF-1α) and a constitutive beta subunit (HIF-1β)...
October 6, 2016: Journal of General Virology
https://www.readbyqxmd.com/read/27837167/nrf2-activation-is-required-for-ligustrazine-to-inhibit-hepatic-steatosis-in-alcohol-preferring-mice-and-hepatocytes
#2
Chunfeng Lu, Wenxuan Xu, Jiangjuan Shao, Feng Zhang, Anping Chen, Shizhong Zheng
Hepatic steatosis is the most distinctive feature of alcoholic liver disease (ALD). Our previous in vivo study showed that ligustrazine, a major active alkaloid isolated from Ligusticum chuanxiong Hort, attenuated alcohol-induced hepatic steatosis and in vitro study revealed that nuclear factor (erythroid-derived 2)-like 2 (Nrf2) activation might be a prerequisite. This study was aimed to explore the in vivo function of Nrf2 in the protective effect of ligustrazine and illustrate downstream mechanisms. Nrf2 shRNA lentivirus was introduced to establish Nrf2-knockdown mice...
November 11, 2016: Toxicological Sciences: An Official Journal of the Society of Toxicology
https://www.readbyqxmd.com/read/27825819/interaction-between-endogenous-carbon-monoxide-and-hydrogen-sulfide-in-the-mechanism-of-gastroprotection-against-acute-aspirin-induced-gastric-damage
#3
Marcin Magierowski, Katarzyna Magierowska, Magdalena Hubalewska-Mazgaj, Juliusz Adamski, Dominik Bakalarz, Zbigniew Sliwowski, Robert Pajdo, Slawomir Kwiecien, Tomasz Brzozowski
Acetylsalicylic acid (ASA) is mainly recognized as painkiller or anti-inflammatory drug. However, ASA causes serious side effects towards gastrointestinal (GI) tract which limits its usefulness. Carbon monoxide (CO) and hydrogen sulfide (H2S) have been described to act as important endogenous messengers and mediators of gastroprotection but whether they can interact in gastroprotection against acute ASA-induced gastric damage remains unknown. In this study male Wistar rats were pretreated with 1) vehicle (saline, i...
November 5, 2016: Pharmacological Research: the Official Journal of the Italian Pharmacological Society
https://www.readbyqxmd.com/read/27824154/manganese-mediated-acceleration-of-age-related-hearing-loss-in-mice
#4
Nobutaka Ohgami, Ichiro Yajima, Machiko Iida, Xiang Li, Reina Oshino, Mayuko Y Kumasaka, Masashi Kato
Despite the fact that manganese (Mn) is known to be a neurotoxic element relevant to age-related disorders, the risk of oral exposure to Mn for age-related hearing loss remains unclear. In this study, we orally exposed wild-type young adult mice to Mn (Mn-exposed WT-mice) at 1.65 and 16.50 mg/L for 4 weeks. Mn-exposed WT-mice showed acceleration of age-related hearing loss. Mn-exposed WT-mice had neurodegeneration of spiral ganglion neurons (SGNs) with increased number of lipofuscin granules. Mn-exposed WT-mice also had increased hypoxia-inducible factor-1 alpha (Hif-1α) protein with less hydroxylation at proline 564 and decreased c-Ret protein in SGNs...
November 8, 2016: Scientific Reports
https://www.readbyqxmd.com/read/27815672/microrna-433-inhibits-the-proliferation-and-migration-of-huvecs-and-neurons-by-targeting-hypoxia-inducible-factor-1-alpha
#5
Lin Zhang, Yuanxiao Zhang, Xiaohua Zhang, Yan Zhang, Yi Jiang, Xinli Xiao, Jing Tan, Wei Yuan, Yong Liu
Emerging evidence has demonstrated an important role of microRNAs (miRNAs) in the pathogenesis of cerebral infarction. In the present study, a down-regulation of microRNA-433 (miR-433) is identified in hypoxia-induced human umbilical vein vascular endothelial cells (HUVECs) as well as in rat neurons, and is found to be negatively regulated cell proliferation and migration. Moreover, the expression of miR-433 is inversely correlated with the expression of hypoxia-inducible factor 1 alpha (HIF-1α), which has been shown to play critical role in responding to hypoxia conditions...
November 4, 2016: Journal of Molecular Neuroscience: MN
https://www.readbyqxmd.com/read/27814606/regulation-and-function-of-renal-medullary-cyclooxygenase-2-during-high-salt-loading
#6
Tianxin Yang, Mi Liu
Prostaglandins (PGs) are important autocrine/paracrine regulators that contribute to sodium balance and blood pressure control. Along the nephron, the highest amount of PGE2 is found in the distal nephron, an important site for fine-tuning of urinary sodium and water excretion. Cylooxygenase-2 (COX-2) is abundantly expressed in the renal medulla and its expression along with urinary PGE2 excretion is highly induced by chronic salt loading. Factors involved in high salt-induced COX-2 expression in the renal medulla include the hypertonicity, fluid shear stress (FSS), and hypoxia-inducible factor-1 alpha (HIF-1 alpha)...
January 1, 2017: Frontiers in Bioscience (Landmark Edition)
https://www.readbyqxmd.com/read/27807832/transcriptome-and-proteome-analyses-of-tnfaip8-knockdown-cancer-cells-reveal-new-insights-into-molecular-determinants-of-cell-survival-and-tumor-progression
#7
Timothy F Day, Rajshree R Mewani, Joshua Starr, Xin Li, Debyani Chakravarty, Habtom Ressom, Xiaojun Zou, Ofer Eidelman, Harvey B Pollard, Meera Srivastava, Usha N Kasid
Tumor necrosis factor-α-inducible protein 8 (TNFAIP8) is the first discovered oncogenic and an anti-apoptotic member of a conserved TNFAIP8 or TIPE family of proteins. TNFAIP8 mRNA is induced by NF-kB, and overexpression of TNFAIP8 has been correlated with poor prognosis in many cancers. Downregulation of TNFAIP8 expression has been associated with decreased pulmonary colonization of human tumor cells, and enhanced sensitivities of tumor xenografts to radiation and docetaxel. Here we have investigated the effects of depletion of TNFAIP8 on the mRNA, microRNA and protein expression profiles in prostate and breast cancers and melanoma...
2017: Methods in Molecular Biology
https://www.readbyqxmd.com/read/27800505/fifteen-days-of-3-200-m-simulated-hypoxia-marginally-regulates-markers-for-protein-synthesis-and-degradation-in-human-skeletal-muscle
#8
Gommaar D'Hulst, Alessandra Ferri, Damien Naslain, Luc Bertrand, Sandrine Horman, Marc Francaux, David J Bishop, Louise Deldicque
Chronic hypoxia leads to muscle atrophy. The molecular mechanisms responsible for this phenomenon are not well defined in vivo. We sought to determine how chronic hypoxia regulates molecular markers of protein synthesis and degradation in human skeletal muscle and whether these regulations were related to the regulation of the hypoxia-inducible factor (HIF) pathway. Eight young male subjects lived in a normobaric hypoxic hotel (FiO2 14.1%, 3,200 m) for 15 days in well-controlled conditions for nutrition and physical activity...
2016: Hypoxia
https://www.readbyqxmd.com/read/27789221/-z-ligustilide-increases-ferroportin1-expression-and-ferritin-content-in-ischemic-sh-sy5y-cells
#9
Yun-Ting Zhang, Fei-Mi Li, Yi-Zhen Guo, Li-Rong Jiang, Juan Ma, Ya Ke, Zhong-Ming Qian
The mechanisms involved in the antioxidant and anti-apoptotic properties of (Z)-ligustilide (LIG) are not fully elucidated. Based on the accumulated data, we hypothesized that LIG might be able to reduce ischemia/reperfusion-induced increase in brain iron by regulating expression of iron transport proteins. We therefore investigated the effects of LIG on iron uptake protein transferrin receptor 1, iron exporter ferroportin 1, iron storage protein ferritin light chain and also hypoxia inducible factor-1 alpha (HIF-1 alpha) in oxygen-glucose deprivation/reoxygenation (OGD/R)-treated SH-SY5Y cells, using Western blot analysis...
October 24, 2016: European Journal of Pharmacology
https://www.readbyqxmd.com/read/27780722/gsno-promotes-functional-recovery-in-experimental-tbi-by-stabilizing-hif-1%C3%AE
#10
Mushfiquddin Khan, Tajinder S Dhammu, Mauhamad Baarine, Jinsu Kim, Manjeet K Paintlia, Inderjit Singh, Avtar K Singh
Traumatic brain injury (TBI) causes sustained disability due to compromised neurorepair mechanisms. Crucial to neurorepair and functional recovery following both TBI and stroke is hypoxia-inducible factor-1 alpha (HIF-1α). Based on reports that HIF-1α could be stabilized via S-nitrosylation, we tested the hypothesis that the S-nitrosylating agent S-nitrosoglutathione (GSNO) would stabilize HIF-1α, thereby stimulating neurorepair mechanisms and aiding in functional recovery. TBI was induced by controlled cortical impact (CCI) in adult rats...
October 22, 2016: Behavioural Brain Research
https://www.readbyqxmd.com/read/27766034/expression-of-iron-regulatory-protein-1-is-regulated-not-only-by-hif-1-but-also-pcreb-under-hypoxia
#11
Qian-Qian Luo, Zhong-Ming Qian, Yu-Fu Zhou, Meng-Wan Zhang, Dang Wang, Li Zhu, Ya Ke
The inconsistent of responses of IRP1 and HIF-1 alpha to hypoxia and the similar tendencies in the changes of IRP1 and pCREB contents led us to hypothesize that pCREB might be involved in the regulation of IRP1 under hypoxia. Here, we investigated the role of pCREB in IRP1 expression in HepG2 cells under hypoxia using quantitative PCR, western blot, immunofluorescence, electrophoretic mobility shift assay (EMSA) and chromatin immunoprecipitation (ChIP). We demonstrated that 1) Hypoxia increased pCREB levels inside of the nucleus; 2) Putative CREs were found in the IRP1 gene; 3) Nuclear extracts of HepG2 cells treated with hypoxia could bind to CRE1 and CRE3, and 100-fold competitor of putative CREs could abolish the binding activity to varying degrees; 4) pCREB was found in the CRE1 and CRE3 DNA-protein complexes of EMSA; 5) CRE1 and CRE3 binding activity of IRP1 depended on CREB activation but not on HIF-1; 6) Increased IRP1 expression under hypoxia could be prevented by LY294002; 7) ChIP assays demonstrated that pCREB binds to IRP1 promoter; and 8) HIF-1 and/or HIF-2 siRNA had no effect on the expression of pCREB and IRP1 proteins in cells treated with hypoxia for 8 hours...
2016: International Journal of Biological Sciences
https://www.readbyqxmd.com/read/27765573/a-polysaccharide-from-sargassum-thunbergii-inhibits-angiogenesis-via-downregulating-mmp-2-activity-and-vegf-hif-1%C3%AE-signaling
#12
Minghui Ou, Xuezhi Sun, Jiancheng Liang, Fei Liu, Liqin Wang, Xiaomin Wu, Jie Tu
A water-soluble polysaccharide (STPC2) was isolated from the boiling-water extract of Sargassum thunbergii, purified by CaCl2 precipitation and chromatography on DEAE-cellulose and Sephacryl S-300 column. It was found that STPC2, with a molecular weight of 57kD, was composed of fucose, xylose, galactose and glucuronic acid, in a ratio of 8.1: 3.8: 2.1: 1.0. Additionally, we found that STPC2 significantly inhibited endothelial cell migration and tube formation without toxicity. Moreover, STPC2 significantly inhibited lung cancer cell A549 migration and proliferation...
October 17, 2016: International Journal of Biological Macromolecules
https://www.readbyqxmd.com/read/27761814/using-histone-deacetylase-inhibitors-to-analyze-the-relevance-of-hdacs-for-translation
#13
Darren M Hutt, Daniela Martino Roth, Christelle Marchal, Marion Bouchecareilh
Gene expression is regulated in part through the reversible acetylation of histones, by the action of histone acetyltransferases (HAT) and histone deacetylases (HDAC). HAT activity results in the addition of acetyl groups on the lysine residues of histone tails leading to decondensation of the chromatin, and increased gene transcription in general, whereas HDACs remove these acetyl groups, thus leading to an overall suppression of gene transcription. Recent evidence has elucidated that histones are not the only components of the proteome that are targeted by HATs and HDACs...
2017: Methods in Molecular Biology
https://www.readbyqxmd.com/read/27754829/potential-inflammatory-markers-in-obstructive-sleep-apnea-hypopnea-syndrome
#14
Dongmei Lu, Nanfang Li, Xiaoguang Yao, Ling Zhou
Obstructive sleep apnea-hypopnea syndrome (OSAHS) is a complex chronic inflammatory respiratory disease with multiple pathogenic factors and high morbidity and mortality. Serum levels of nuclear factor-κB (NF-κB), hypoxia-inducible factor-1 alpha (HIF-1α), and surfactant protein D (SPD) were investigated in OSAHS patients, to determine their clinical significance and correlation with the pathogenesis. Patients were classified into a mild and moderate OSAHS group (n = 25) and severe OSAHS group (n = 33). Twenty healthy patients served as a control group...
October 18, 2016: Bosnian Journal of Basic Medical Sciences
https://www.readbyqxmd.com/read/27752923/a-simple-method-to-induce-hypoxia-induced-vascular-endothelial-growth-factor-a-vegf-a-expression-in-t24-human-bladder-cancer-cells
#15
Jonas Magno Santos Cesário, Rodrigo Barbosa Oliveira Brito, Camila Soares Malta, Chrisna Souza Silva, Yves Silva Teles Matos, Tânia Cristina Macedo Kunz, Jessica Julioti Urbano, Luis Vicente Franco Oliveira, Maria Aparecida Dalboni, Humberto Dellê
Angiogenesis is an essential process for the establishment, development, and dissemination of several malignant tumors including bladder cancer. The hypoxic condition promotes the stabilization of hypoxia-inducible factor 1 alpha (HIF-1α), which translocates to the nucleus to mediate angiogenic factors including the vascular endothelial growth factor A (VEGF-A). AnaeroGen system was developed for microbiology area to create a low oxygen tension required to the growth of anaerobic bacteria. Here, we hypothesized the use of AnaeroGen system to induce hypoxia in T24 human bladder carcinoma cells, in order to promote the overexpression of VEGF-A...
October 17, 2016: In Vitro Cellular & Developmental Biology. Animal
https://www.readbyqxmd.com/read/27744530/expression-of-hif-1%C3%AE-odd-domain-fused-canine-caspase-3-by-egfr-promoter-driven-adenovirus-vector-induces-cytotoxicity-in-canine-breast-tumor-cells-under-hypoxia
#16
Mariko Okamoto, Ai Asamura, Ko Tanaka, Takefumi Soeda, Kyo Watanabe, Hiroyuki Mizuguchi, Teruo Ikeda
Adenovirus (Ad) vectors are widely used in cancer gene therapies. However, compared to human patients, relatively limited information is available on gene transduction efficiency or cell-specific cytotoxicity in canine tumor cells transduced with Ad vectors. Since epidermal growth factor receptor (EGFR) is highly expressed on canine breast tumor cells, we sought to develop an Ad vector based on the RGD fiber-mutant adenovirus vector (AdRGD) that expresses canine caspase 3 under the control of EGFR promoter...
October 16, 2016: Veterinary Research Communications
https://www.readbyqxmd.com/read/27743994/role-of-hif-1%C3%AE-in-the-hypoxia-inducible-expression-of-the-thiamine-transporter-slc19a3
#17
Kristy Zera, Rebecca Sweet, Jason Zastre
Ensuring continuous intracellular supply of thiamine is essential to maintain metabolism. Cellular homeostasis requires the function of the membrane bound thiamine transporters THTR1 and THTR2. In the absence of increased dietary intake of thiamine, varying intracellular levels to meet metabolic demands during pathophysiological stressors, such as hypoxia, requires adaptive regulatory mechanisms to increase thiamine transport capacity. Previous work has established the up-regulation of SLC19A3 (THTR2) gene expression and activity during hypoxic stress through the activity of the hypoxia inducible transcription factor 1 alpha (HIF-1α)...
December 31, 2016: Gene
https://www.readbyqxmd.com/read/27683542/the-endogenous-hallucinogen-and-trace-amine-n-n-dimethyltryptamine-dmt-displays-potent-protective-effects-against-hypoxia-via-sigma-1-receptor-activation-in-human-primary-ipsc-derived-cortical-neurons-and-microglia-like-immune-cells
#18
Attila Szabo, Attila Kovacs, Jordi Riba, Srdjan Djurovic, Eva Rajnavolgyi, Ede Frecska
N,N-dimethyltryptamine (DMT) is a potent endogenous hallucinogen present in the brain of humans and other mammals. Despite extensive research, its physiological role remains largely unknown. Recently, DMT has been found to activate the sigma-1 receptor (Sig-1R), an intracellular chaperone fulfilling an interface role between the endoplasmic reticulum (ER) and mitochondria. It ensures the correct transmission of ER stress into the nucleus resulting in the enhanced production of antistress and antioxidant proteins...
2016: Frontiers in Neuroscience
https://www.readbyqxmd.com/read/27678303/erianin-inhibits-high-glucose-induced-retinal-angiogenesis-via-blocking-erk1-2-regulated-hif-1%C3%AE-vegf-vegfr2-signaling-pathway
#19
Zengyang Yu, Tianyu Zhang, Chenyuan Gong, Yuchen Sheng, Bin Lu, Lingyu Zhou, Lili Ji, Zhengtao Wang
Erianin is a natural compound found in Dendrobium chrysotoxum Lindl. Diabetic retinopathy (DR) is a serious and common microvascular complication of diabetes. This study aims to investigate the inhibitory mechanism of erianin on retinal neoangiogenesis and its contribution to the amelioration of DR. Erianin blocked high glucose (HG)-induced tube formation and migration in choroid-retinal endothelial RF/6A cells. Erianin inhibited HG-induced vascular endothelial growth factor (VEGF) expression, hypoxia-inducible factor 1-alpha (HIF-1α) translocation into nucleus and ERK1/2 activation in RF/6A and microglia BV-2 cells...
September 28, 2016: Scientific Reports
https://www.readbyqxmd.com/read/27672589/a-novel-model-of-retinopathy-of-prematurity-in-normobaric-hyperoxic-conditions
#20
Taner Ozgurtas, Sercan Tekin, Fatih Yesildal, Umut Karaca, Fevzi Nuri Aydin, Muhammed Talha Ugurlu, Mehmet Ozler, Hakan Durukan
AIM: To examine changes in retinal vasculature after treatment with different oxygen concentrations from common retinopathy of prematurity (ROP) models and to determine a novel and practical ROP model. METHODS: A sample of 14 newborn Sprague-Dawley rats was used. The study group (n=7) was exposed to 95% oxygen for 4h per day followed by normoxic laboratory conditions for 20h. This cycle was repeated for 14d. The control group (n=7) was subjected to normobaric normoxic conditions...
2016: International Journal of Ophthalmology
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