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Hypoxia inducible factor

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https://www.readbyqxmd.com/read/29045486/thiamine-deficiency-activates-hypoxia-inducible-factor-1%C3%AE-to-facilitate-pro-apoptotic-responses-in-mouse-primary-astrocytes
#1
Kristy Zera, Jason Zastre
Thiamine is an essential enzyme cofactor required for proper metabolic function and maintenance of metabolism and energy production in the brain. In developed countries, thiamine deficiency (TD) is most often manifested following chronic alcohol consumption leading to impaired mitochondrial function, oxidative stress, inflammation and excitotoxicity. These biochemical lesions result in apoptotic cell death in both neurons and astrocytes. Comparable histological injuries in patients with hypoxia/ischemia and TD have been described in the thalamus and mammillary bodies, suggesting a congruency between the cellular responses to these stresses...
2017: PloS One
https://www.readbyqxmd.com/read/29044949/induction-of-erythropoietin-gene-expression-in-epithelial-cells-by-chemicals-identified-in-gata-inhibitor-screenings
#2
Hiroshi Kaneko, Takehide Katoh, Ikuo Hirano, Atsushi Hasegawa, Tadayuki Tsujita, Masayuki Yamamoto, Ritsuko Shimizu
Erythropoietin (EPO) is a hormone that promotes proliferation, differentiation and survival of erythroid progenitors. EPO gene expression is regulated in a tissue-specific and hypoxia-inducible manner and is mainly restricted to renal EPO-producing cells after birth. Chronic kidney disease (CKD) confers high risk for renal anemia due to lower EPO production from injured kidneys. In transgenic reporter lines of mice, disruption of a GATA-binding motif within the Epo gene promoter-proximal region restores constitutive reporter expression in epithelial cells...
October 18, 2017: Genes to Cells: Devoted to Molecular & Cellular Mechanisms
https://www.readbyqxmd.com/read/29042936/the-expression-of-vasohibin-1-and-its-prognostic-significance-in-bladder-cancer
#3
Bo Zhang, Zhouliang Wu, Wanqin Xie, Dawei Tian, Feiran Chen, Chuan Qin, Zhiyong Du, Gang Tang, Qiongqiong Gao, Xiaoyu Qiu, Changli Wu, Jing Tian, Hailong Hu
Angiogenesis is important in the development of solid tumors. Vasohibin-1 (VASH-1) is an endothelium-derived protein that acts as an inhibitor of angiogenesis in many different types of cancer. However, the expression of VASH-1 and its clinical value in bladder cancer remain unknown. The current study analyzed the expression of VASH-1, as well as the expression of the angiogenesis-related factors vascular endothelial growth factor-A, hypoxia inducible factor-1α and cluster of differentiation 34 in bladder cancer tissues from 50 patients using immunohistochemistry...
October 2017: Experimental and Therapeutic Medicine
https://www.readbyqxmd.com/read/29042934/intermittent-hypoxia-simulating-obstructive-sleep-apnea-causes-pulmonary-inflammation-and-activates-the-nrf2-ho-1-pathway
#4
Yeying Wang, Yanling Chai, Xiaojie He, Li Ai, Xia Sun, Yiling Huang, Yongxia Li
Obstructive sleep apnea (OSA) is a disorder with high morbidity in adults. OSA damages multiple organs and tissues, including the cardiovascular and cerebrovascular systems, the metabolism system, the lungs, liver and heart. OSA-induced damage is earliest and greatest to the pulmonary tissue. The present study established a rat OSA model of differing severity by inducing intermittent hypoxia with different concentrations of O2 and it was determined that OSA caused a severe oxidative stress response and pulmonary inflammation in a dose-dependent manner...
October 2017: Experimental and Therapeutic Medicine
https://www.readbyqxmd.com/read/29042275/basil-polysaccharide-attenuates-hepatocellular-carcinoma-metastasis-in-rat-by-suppressing-h3k9me2-histone-methylation-under-hepatic-artery-ligation-induced-hypoxia
#5
Bing Feng, Ying Zhu, Zuqing Su, Lipeng Tang, Chaoyue Sun, Caiyun Li, Guangjuan Zheng
Hepatocellular carcinoma (HCC) is one of the most common and fatal cancers in the world. Tumor metastasis is an important factor of poor prognosis in patients with HCC. Tumor hypoxia can promote tumor cell metastasis in HCC. Epigenetic modification is closely related to tumor hypoxia and metastasis. In our previous research, we found that basil polysaccharide suppressed migration and invasion of HCC cell by inhibiting hypoxia induced histone methylation in vitro. In the present study, we investigated the effect of basil polysaccharide on the walker 256 carcinoma cell metastasis in rat...
October 14, 2017: International Journal of Biological Macromolecules
https://www.readbyqxmd.com/read/29042072/mir-200b-downregulates-kruppel-like-factor-2-klf2-during-acute-hypoxia-in-human-endothelial-cells
#6
Rafal Bartoszewski, Marcin Serocki, Anna Janaszak-Jasiecka, Sylwia Bartoszewska, Kinga Kochan-Jamrozy, Arkadiusz Piotrowski, Jarosław Króliczewski, James F Collawn
The role of microRNAs in controlling angiogenesis is recognized as a promising therapeutic target in both cancer and cardiovascular disorders. However, understanding a miRNA's pleiotropic effects on angiogenesis is a limiting factor for these types of therapeutic approaches. Using genome-wide next-generation sequencing, we examined the role of an antiangiogenic miRNA, miR-200b, in primary human endothelial cells. The results indicate that miR-200b has complex effects on hypoxia-induced angiogenesis in human endothelia and importantly, that many of the reported miR-200b effects using miRNA overexpression may not be representative of the physiological role of this miRNA...
October 13, 2017: European Journal of Cell Biology
https://www.readbyqxmd.com/read/29040978/hydrogen-rich-saline-attenuates-brain-injury-induced-by-cardiopulmonary-bypass-and-inhibits-microvascular-endothelial-cell-apoptosis-via-the-pi3k-akt-gsk3%C3%AE-signaling-pathway-in-rats
#7
Keyan Chen, Nan Wang, Yugang Diao, Wanwei Dong, YingJie Sun, Lidan Liu, Xiuying Wu
BACKGROUND/AIMS: Cardiopulmonary bypass (CPB) is prone to inducing brain injury during open heart surgery. A hydrogen-rich solution (HRS) can prevent oxidation and apoptosis, and inhibit inflammation. This study investigated effects of HRS on brain injury induced by CPB and regulatory mechanisms of the PI3K/Akt/GSK3β signaling pathway. METHODS: A rat CPB model and an in vitro cell hypoxia model were established. After HRS treatment, Rat behavior was measured using neurological deficit score; Evans blue (EB) was used to assess permeability of the blood-brain barrier (BBB); HE staining was used to observe pathological changes; Inflammatory factors and brain injury markers were detected by ELISA; the PI3K/Akt/GSK3β pathway-related proteins and apoptosis were assessed by western blot, immunohistochemistry and qRT -PCR analyses of brain tissue and neurons...
October 17, 2017: Cellular Physiology and Biochemistry
https://www.readbyqxmd.com/read/29039615/effects-of-deferoxamine-on-the-osteogenic-differentiation-of-human-periodontal-ligament-cells
#8
Sen Mu, Shuanlong Guo, Xiang Wang, Yuanbo Zhan, Ying Li, Ying Jiang, Ruimin Zhang, Bin Zhang
Hypoxia regulates a number of cell biological processes, including cell survival, development and differentiation. Deferoxamine (DFO), an oral chelator for blood transfusion patients, has been demonstrated to induce hypoxia and is frequently used as a hypoxia‑mimicking agent. The purpose of the present study was to investigate the influence of DFO on the proliferation, migration and osteogenic differentiation of human periodontal ligament cells (hPDLCs). The effects of DFO on hPDLC viability and migration were measured using an MTT and wound healing assay...
October 17, 2017: Molecular Medicine Reports
https://www.readbyqxmd.com/read/29039568/3-3-%C3%A2-diindolylmethane-attenuates-cardiomyocyte-hypoxia-by-modulating-autophagy-in-h9c2-cells
#9
Kai Liang, Wen-Hao Qian, Jing Zong
Autophagy is activated in the ischemic heart and is a process that is essential for survival, differentiation, development and homeostasis. 3,3'‑Diindolylmethane (DIM) is a natural product of the acid‑catalyzed condensation of indole‑3‑carbinol in cruciferous vegetables. Numerous studies have suggested that DIM has various pharmacological effects, including antioxidant, antitumor, anti‑angiogenic and anti‑apoptotic properties. However, the function of DIM on hypoxia‑induced cardiac injury remains to be elucidated...
October 13, 2017: Molecular Medicine Reports
https://www.readbyqxmd.com/read/29039565/hydrogen-sulfide-regulates-bone-remodeling-and-promotes-orthodontic-tooth-movement
#10
Haiya Pu, Yongmei Hua
Hydrogen sulfide (H2S) is a gas signaling molecule that has multiple influences on physiological and pathological processes in the mammalian body, including vasodilation, neurotransmission, inflammation, hypoxia sensing and bone remodeling. Our previous studies suggested that H2S might be involved in the periodontal tissue remodeling during the orthodontic tooth movement (OTM) via increasing periodontal ligament cell differentiation, tissue mineralization, bone formation and collagen synthesis. The aim of the present study was to investigate the effects of H2S on alveolar bone remodeling that is associated with tooth movement...
October 17, 2017: Molecular Medicine Reports
https://www.readbyqxmd.com/read/29039561/hovenia-dulcis-thunb-and-its-active-compound-ampelopsin-inhibit-angiogenesis-through-suppression-of-vegfr2-signaling-and-hif-1%C3%AE-expression
#11
Jang Mi Han, Haet Nim Lim, Hye Jin Jung
Specific inhibition of angiogenesis has been considered a powerful strategy for the treatment of cancer and other angiogenesis-related human diseases. Hovenia dulcis Thunb., Japanese raisin tree or Oriental raisin tree, is a hardy tree found in Asia, Eastern China and Korea and has been known to possess various biological activities, including antifatigue, antidiabetic, neuroprotective and hepatoprotective activity. In the present study, for the first time, we evaluated whether a 100% ethanol extract of Hovenia dulcis Thunb...
October 11, 2017: Oncology Reports
https://www.readbyqxmd.com/read/29039529/inhibitory-effect-of-1%C3%A2-tetradecanol-on-helicobacter%C3%A2-pylori%C3%A2-induced-production-of-interleukin%C3%A2-8-and-vascular-endothelial-growth-factor-in-gastric-epithelial-cells
#12
Green Kim, Jae-Eun Kim, Min-Jung Kang, Ah-Ra Jang, Young Ran Kim, Sunoh Kim, Kyu-Tae Chang, Jung Joo Hong, Jong-Hwan Park
Helicobacter pylori (H. pylori) infection activates pro‑inflammatory mediators, including interleukin (IL)‑8 and vascular endothelial growth factor (VEGF) in gastric epithelial cells. 1‑Tetradecanol (1‑TD) has been purified from Dendropanax morbifera Leveille; its physiological activities are poorly understood. The present study assessed whether 1‑TD has an effect on H. pylori‑mediated inflammation in AGS gastric epithelial cells. 1‑TD reduced IL‑8 production by AGS cells in response to H...
October 13, 2017: Molecular Medicine Reports
https://www.readbyqxmd.com/read/29039464/hypothermia-inhibits-the-proliferation-of-bone-marrow-derived-mesenchymal-stem-cells-and-increases-tolerance-to-hypoxia-by-enhancing-sumoylation
#13
Xiaozhi Liu, Wenbo Ren, Zhongmin Jiang, Zhiguo Su, Xiaofang Ma, Yanxia Li, Rongcai Jiang, Jianning Zhang, Xinyu Yang
Hypothermia therapy has a positive effect on patients with severe brain injury. Recent studies have shown that mild hypothermia increases the survival of bone marrow-derived mesenchymal stem cells (BMSCs) in a hypoxic environment; however, the underlying mechanisms are not yet fully understood. Small ubiquitin-like modifiers (SUMOs) are sensitive to temperature stress reactions and are considered to exert a protective effect. In this study, we examined the protective effects of hypothermia on BMSCs in terms of SUMO protein modification...
September 29, 2017: International Journal of Molecular Medicine
https://www.readbyqxmd.com/read/29039446/protective-effect-of-autophagy-in-neural-ischemia-and-hypoxia-negative-regulation-of-the-wnt-%C3%AE-catenin-pathway
#14
Zhen-Yu Shi, Jie-Xin Deng, Su Fu, Lai Wang, Qiang Wang, Bin Liu, Yong-Qiang Li, Jin-Bo Deng
Autophagy is a highly conserved process of self-digestion to promote cell survival in response to nutrient starvation and other metabolic stresses. However, whether ischemic-hypoxic (IH) injury-induced autophagy acts as a neuroprotective mechanism or leads to neuroinjury is a subject of debate. It is known that autophagy is regulated by signaling pathways, including the mammalian target of rapamycin pathway. However, in neural IH injury, whether other signaling pathways are involved in the regulation of autophagy remains to be fully elucidated...
September 28, 2017: International Journal of Molecular Medicine
https://www.readbyqxmd.com/read/29039442/angiogenic-effects-of-apigenin-on-endothelial-cells-after-hypoxia-reoxygenation-via-the-caveolin-1-pathway
#15
Fengxia Tu, Qiongyi Pang, Xiang Chen, Tingting Huang, Meixia Liu, Qiongxiang Zhai
In the present study, we aimed to elucidate whether apigenin contributes to the induction of angiogenesis and the related mechanisms in cell hypoxia-reoxygenation injury. The role of apigenin was examined in human umbilical vein endothelial cell (HUVEC) viability, migration and tube formation in vitro. To investigate the related mechanisms, we used caveolin-1 short interfering RNA. The viability of HUVECs was measured using Cell Counting Kit-8 assays, HUVEC migration was analyzed by crystal violet staining, and a tube formation assay was performed using the branch point method...
September 28, 2017: International Journal of Molecular Medicine
https://www.readbyqxmd.com/read/29039125/hypoxia-inducible-factor-hif-in-the-tumor-microenvironment-friend-or-foe
#16
REVIEW
Yanqing Huang, Daniel Lin, Cullen M Taniguchi
Hypoxia acts as an important regulator of physiological and pathological processes. Hypoxia inducible factors (HIFs) are the central players involved in the cellular adaptation to hypoxia and are regulated by oxygen sensing EGLN prolyl hydroxylases. Hypoxia affects many aspects of cellular growth through both redox effects and through the stabilization of HIFs. The HIF isoforms likely have differential effects on tumor growth via alteration of metabolism, growth, and self-renewal and are likely highly context-dependent...
October 13, 2017: Science China. Life Sciences
https://www.readbyqxmd.com/read/29038511/gene-delivery-of-hypoxia-inducible-vegf-targeting-collagen-effectively-improves-cardiac-function-after-myocardial-infarction
#17
Jing-Bo Xia, Hai-Yan Wu, Bing-Lin Lai, Li Zheng, Deng-Cheng Zhou, Zao-Shang Chang, Cheng-Zhou Mao, Guang-Hui Liu, Kyu-Sang Park, Hui Zhao, Soo-Ki Kim, Guo-Hua Song, Dong-Qing Cai, Xu-Feng Qi
Vascular endothelial growth factor (VEGF) plays important roles in improvement of cardiac function following myocardial infarction (MI). However, the lack of a steerable delivery system of VEGF targeting the infarcted myocardium reduces the therapeutic efficacy and safety. Here, we constructed a series of lentiviral vector systems which could express a fusion protein consisted of a collagen-binding domain (CBD) and hVEGF (CBDhVEGF), under the control of 5HRE-hCMVmp (5HRE), the hypoxia-inducible promoter consists of five copies of the hypoxia-responsive element (HRE) and a human cytomegalovirus minimal promoter (hCMVmp)...
October 16, 2017: Scientific Reports
https://www.readbyqxmd.com/read/29038348/stk33-promotes-growth-and-progression-of-pancreatic-cancer-as-a-critical-downstream-mediator-of-hif-1%C3%AE
#18
Fanyang Kong, Xiangyu Kong, Yiqi Du, Ying Chen, Xuan Deng, Jianwei Zhu, Jiawei Du, Lei Li, Zhiliang Jia, Dacheng Xie, Zhaoshen Li, Keping Xie
The serine/threonine kinase STK33 has been implicated in cancer cell proliferation. Here we provide evidence of a critical role for STK33 in the pathogenesis and metastatic progression of pancreatic ductal adenocarcinoma (PDAC). STK33 expression in PDAC was regulated by the hypoxia-inducible transcription factor HIF-1α. In human PDAC specimens, STK33 was overexpressed and associated with poor prognosis. Enforced STK33 expression promoted PDAC proliferation, migration, invasion and tumor growth, whereas STK33 depletion exerted opposing effects...
October 16, 2017: Cancer Research
https://www.readbyqxmd.com/read/29037142/enzyme-substrate-reporters-for-evaluation-of-substrate-specificity-of-hif-prolyl-hydroxylase-isoforms
#19
A I Osipyants, N A Smirnova, A Yu Khristichenko, D M Hushpulian, S V Nikulin, T A Chubar, A A Zakhariants, V I Tishkov, I G Gazaryan, A A Poloznikov
An organism naturally responds to hypoxia via stabilization of hypoxia-inducible factor (HIF). There are three isoforms of HIFα subunits whose stability is regulated by three isozymes of HIF prolyl hydroxylase (PHD1-3). Despite intense studies on recombinant enzyme isoforms using homogeneous activity assay, there is no consensus on the PHD isoform preference for the HIF isoform as a substrate. This work provides a new approach to the problem of substrate specificity using cell-based reporters expressing the enzyme and luciferase-labeled substrate pair encoded in the same expression vector...
October 2017: Biochemistry. Biokhimii︠a︡
https://www.readbyqxmd.com/read/29036915/stat3-but-not-hif-1%C3%AE-is-important-in-mediating-hypoxia-induced-chemoresistance-in-mda-mb-231-a-triple-negative-breast-cancer-cell-line
#20
Hoda Soleymani Abyaneh, Nidhi Gupta, Aneta Radziwon-Balicka, Paul Jurasz, John Seubert, Raymond Lai, Afsaneh Lavasanifar
Hypoxia-induced chemoresistance (HICR) is a well-recognized phenomenon, and in many experimental models, hypoxia inducible factor-1α (HIF-1α) is believed to be a key player. We aimed to better understand the mechanism underlying HICR in a triple negative breast cancer cell line, MDA-MB-231, with a focus on the role of HIF-1α. In this context, the effect of hypoxia on the sensitivity of MDA-MB-231 cells to cisplatin and their stem-like features was evaluated and the role of HIF-1α in both phenomena was assessed...
October 14, 2017: Cancers
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