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Nguyen TVH, Bergmann U, Kietzmann T, Mennerich D. Protein kinase B/AKT phosphorylates hypoxia-inducible factor-3α1 in response to insulin, promoting cell growth and migration. Front Cell Dev Biol 2023; 11:1250000. [PMID: 38020884 PMCID: PMC10665492 DOI: 10.3389/fcell.2023.1250000] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/29/2023] [Accepted: 10/23/2023] [Indexed: 12/01/2023] Open
Abstract
Hypoxia-inducible factors (HIFs) are best known for their roles in the adaptation to low oxygen environments. Besides hypoxia, HIF-1/2 α-subunits are also regulated by various non-hypoxic stimuli including insulin which can act via the PI3K/protein kinase B (PKB) signaling pathway. However, with respect to insulin little is known about HIF-3α. We aimed to investigate this relationship and found that insulin stimulates HIF-3α expression under both normal and low oxygen conditions. Blocking PKB activity reversed the effects of insulin, indicating that HIF-3α is a direct target of PKB. We identified serine 524, located in the oxygen-dependent degradation domain of HIF-3α, as a phosphorylation site of PKB. Mutating serine 524 impaired binding of PKB to HIF-3α and its ubiquitination, suggesting that PKB regulates HIF-3α stability through phosphorylation, thereby affecting important cellular processes such as cell viability and cell adhesion. Importantly, we discovered that this phosphorylation site also influenced insulin-dependent cell migration. These findings shed light on a novel mechanism by which insulin affects PKB-dependent HIF-3α expression and activity, with potential implications in metabolic diseases and cancer.
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Affiliation(s)
| | | | - Thomas Kietzmann
- Faculty of Biochemistry and Molecular Medicine, and Biocenter Oulu, University of Oulu, Oulu, Finland
| | - Daniela Mennerich
- Faculty of Biochemistry and Molecular Medicine, and Biocenter Oulu, University of Oulu, Oulu, Finland
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2
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Dias S, Willmer T, Adam S, Pheiffer C. The role of maternal DNA methylation in pregnancies complicated by gestational diabetes. FRONTIERS IN CLINICAL DIABETES AND HEALTHCARE 2022; 3:982665. [PMID: 36992770 PMCID: PMC10012132 DOI: 10.3389/fcdhc.2022.982665] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/30/2022] [Accepted: 08/22/2022] [Indexed: 11/13/2022]
Abstract
Diabetes in pregnancy is associated with adverse pregnancy outcomes and poses a serious threat to the health of mother and child. Although the pathophysiological mechanisms that underlie the association between maternal diabetes and pregnancy complications have not yet been elucidated, it has been suggested that the frequency and severity of pregnancy complications are linked to the degree of hyperglycemia. Epigenetic mechanisms reflect gene-environment interactions and have emerged as key players in metabolic adaptation to pregnancy and the development of complications. DNA methylation, the best characterized epigenetic mechanism, has been reported to be dysregulated during various pregnancy complications, including pre-eclampsia, hypertension, diabetes, early pregnancy loss and preterm birth. The identification of altered DNA methylation patterns may serve to elucidate the pathophysiological mechanisms that underlie the different types of maternal diabetes during pregnancy. This review aims to provide a summary of existing knowledge on DNA methylation patterns in pregnancies complicated by pregestational type 1 (T1DM) and type 2 diabetes mellitus (T2DM), and gestational diabetes mellitus (GDM). Four databases, CINAHL, Scopus, PubMed and Google Scholar, were searched for studies on DNA methylation profiling in pregnancies complicated with diabetes. A total of 1985 articles were identified, of which 32 met the inclusion criteria and are included in this review. All studies profiled DNA methylation during GDM or impaired glucose tolerance (IGT), while no studies investigated T1DM or T2DM. We highlight the increased methylation of two genes, Hypoxia‐inducible Factor‐3α (HIF3α) and Peroxisome Proliferator-activated Receptor Gamma-coactivator-Alpha (PGC1-α), and the decreased methylation of one gene, Peroxisome Proliferator Activated Receptor Alpha (PPARα), in women with GDM compared to pregnant women with normoglycemia that were consistently methylated across diverse populations with varying pregnancy durations, and using different diagnostic criteria, methodologies and biological sources. These findings support the candidacy of these three differentially methylated genes as biomarkers for GDM. Furthermore, these genes may provide insight into the pathways that are epigenetically influenced during maternal diabetes and which should be prioritized and replicated in longitudinal studies and in larger populations to ensure their clinical applicability. Finally, we discuss the challenges and limitations of DNA methylation analysis, and the need for DNA methylation profiling to be conducted in different types of maternal diabetes in pregnancy.
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Affiliation(s)
- Stephanie Dias
- Biomedical Research and Innovation Platform, South African Medical Research Council, Cape Town, South Africa
| | - Tarryn Willmer
- Biomedical Research and Innovation Platform, South African Medical Research Council, Cape Town, South Africa
- Centre for Cardio-Metabolic Research in Africa, Division of Medical Physiology, Faculty of Medicine and Health Sciences, Stellenbosch University, Cape Town, South Africa
| | - Sumaiya Adam
- Department of Obstetrics and Gynecology, Faculty of Health Sciences, University of Pretoria, Pretoria, South Africa
- Diabetes Research Center, Faculty of Health Sciences, University of Pretoria, Pretoria, South Africa
| | - Carmen Pheiffer
- Biomedical Research and Innovation Platform, South African Medical Research Council, Cape Town, South Africa
- Centre for Cardio-Metabolic Research in Africa, Division of Medical Physiology, Faculty of Medicine and Health Sciences, Stellenbosch University, Cape Town, South Africa
- Department of Obstetrics and Gynecology, Faculty of Health Sciences, University of Pretoria, Pretoria, South Africa
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Katsel P, Fam P, Tan W, Khan S, Gama-Sosa M, De Gasperi R, Roussos P, Robinson A, Cooper I, Schnaider-Beeri M, Haroutunian V. Engagement of vascular early response genes typifies mild cognitive impairment. Alzheimers Dement 2022; 18:1357-1369. [PMID: 34758195 PMCID: PMC10878080 DOI: 10.1002/alz.12481] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/22/2021] [Revised: 07/07/2021] [Accepted: 08/11/2021] [Indexed: 11/12/2022]
Abstract
INTRODUCTION Molecular responses in the brains of persons with mild cognitive impairment (MCI), the earliest transitional state between normal aging and early Alzheimer's disease (AD), are poorly understood. METHODS We examined AD-related neuropathology and transcriptome changes in the neocortex of individuals with MCI relative to controls and temporal responses to the mild hypoxia in mouse brains. RESULTS Subsets of vascular early response to hypoxia genes were upregulated in MCI prior to the buildup of AD neuropathology. Early activation of pro-angiogenic hypoxia-inducible factor signaling in response to mild hypoxia was detected in mouse brains similar to those that were altered in MCI. Protracted responses to hypoxia were characterized by activation of phosphoinositide 3-kinase (PI3K)-protein kinase B (Akt)-the mammalian target of rapamycin (mTOR) pathways in brain microvessel isolates. DISCUSSION These findings suggest that cerebrovascular remodeling is an important antecedent to the development of dementia and a component of the homeostatic response to reduced oxygen tension in aging prior to the onset of AD.
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Affiliation(s)
- Pavel Katsel
- Department of Psychiatry, The Icahn School of Medicine at
Mount Sinai, New York, New York, USA
| | - Peter Fam
- Department of Neuroscience, The Icahn School of Medicine at
Mount Sinai, New York, New York, USA
| | - Weilun Tan
- Department of Psychiatry, The Icahn School of Medicine at
Mount Sinai, New York, New York, USA
| | - Sonia Khan
- Department of Psychiatry, The Icahn School of Medicine at
Mount Sinai, New York, New York, USA
| | - Miguel Gama-Sosa
- Department of Psychiatry, The Icahn School of Medicine at
Mount Sinai, New York, New York, USA
| | - Rita De Gasperi
- Department of Psychiatry, The Icahn School of Medicine at
Mount Sinai, New York, New York, USA
| | - Panos Roussos
- Department of Psychiatry, The Icahn School of Medicine at
Mount Sinai, New York, New York, USA
- Genetics and Genomic Sciences, The Icahn School of Medicine
at Mount Sinai, New York, New York, USA
- Pamela Sklar Division of Psychiatric Genomics and Friedman
Brain Institute, The Icahn School of Medicine at Mount Sinai, New York, New York,
USA
| | - Ari Robinson
- The Joseph Sagol Neuroscience Center Tel-Hashomer,
Ramat-Gan, Israel
| | - Itzik Cooper
- The Joseph Sagol Neuroscience Center Tel-Hashomer,
Ramat-Gan, Israel
| | - Michal Schnaider-Beeri
- Department of Psychiatry, The Icahn School of Medicine at
Mount Sinai, New York, New York, USA
- The Joseph Sagol Neuroscience Center Tel-Hashomer,
Ramat-Gan, Israel
| | - Vahram Haroutunian
- Department of Psychiatry, The Icahn School of Medicine at
Mount Sinai, New York, New York, USA
- Department of Neuroscience, The Icahn School of Medicine at
Mount Sinai, New York, New York, USA
- Mental Illness Research, Education and Clinical Center
(MIRECC), James J Peters VA Medical Center, Bronx, New York, USA
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4
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Knutson AK, Williams AL, Boisvert WA, Shohet RV. HIF in the heart: development, metabolism, ischemia, and atherosclerosis. J Clin Invest 2021; 131:137557. [PMID: 34623330 DOI: 10.1172/jci137557] [Citation(s) in RCA: 47] [Impact Index Per Article: 15.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023] Open
Abstract
The heart forms early in development and delivers oxygenated blood to the rest of the embryo. After birth, the heart requires kilograms of ATP each day to support contractility for the circulation. Cardiac metabolism is omnivorous, utilizing multiple substrates and metabolic pathways to produce this energy. Cardiac development, metabolic tuning, and the response to ischemia are all regulated in part by the hypoxia-inducible factors (HIFs), central components of essential signaling pathways that respond to hypoxia. Here we review the actions of HIF1, HIF2, and HIF3 in the heart, from their roles in development and metabolism to their activity in regeneration and preconditioning strategies. We also discuss recent work on the role of HIFs in atherosclerosis, the precipitating cause of myocardial ischemia and the leading cause of death in the developed world.
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5
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Shen J, Song R, Ye Y, Wu X, Chow WH, Zhao H. HIF3A DNA methylation, obesity and weight gain, and breast cancer risk among Mexican American women. Obes Res Clin Pract 2020; 14:548-553. [PMID: 33121895 DOI: 10.1016/j.orcp.2020.10.001] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/02/2020] [Revised: 09/22/2020] [Accepted: 10/06/2020] [Indexed: 02/07/2023]
Abstract
OBJECTIVE In previous epigenome-wide association studies, Hypoxia inducible Factor 3 Alpha Subunit (HIF3A) DNA methylation has been reported to be associated with body mass index (BMI) and weight change. However, none of these studies have included Mexican Americans. METHODS In the current study, we assessed levels of HIF3A methylation in 927 Mexican American women identified from Mano-A-Mano, the Mexican American Cohort study. RESULTS Significantly higher methylation levels at three CpG sites (position 46801557, 46801642, and 46801699) were observed in obese women compared to non-obese women (P < 0.05). Furthermore, we found that elevated methylation levels at those three CpG sites were associated with significant weight gain (P < 0.05), defined as an increase in BMI by at least one category between the baseline and the follow-up, with a median follow-up time of 39 months. Then, using pre-diagnostic blood DNA samples, we found increased DNA methylation at CpG 46801642 to be associated with a 1.35-fold increased risk of breast cancer (Hazard Ratio (HR) = 1.35, 95% Confidence Interval (CI): 1.02, 3.01), with a median follow-up time of 127 months. Using the Cancer Genome Atlas (TCGA) data, we further found that levels of HIF3A were significantly higher-methylated and down-regulated in breast tumor than in normal tissues (P < 1 × 1012 for both). CONCLUSION Thus, our results provide evidence to support the role of HIF3A in obesity, weight gain, and the development of breast cancer.
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Affiliation(s)
- Jie Shen
- Department of Epidemiology, The University of Texas MD Anderson Cancer Center, Houston, TX, USA; Department of Family Medicine and Population Health, School of Medicine, Virginia Commonwealth University, VA, USA
| | - Renduo Song
- Department of Epidemiology, The University of Texas MD Anderson Cancer Center, Houston, TX, USA
| | - Yuanqing Ye
- Department of Epidemiology, The University of Texas MD Anderson Cancer Center, Houston, TX, USA
| | - Xifeng Wu
- Department of Epidemiology, The University of Texas MD Anderson Cancer Center, Houston, TX, USA
| | - Wong-Ho Chow
- Department of Epidemiology, The University of Texas MD Anderson Cancer Center, Houston, TX, USA
| | - Hua Zhao
- Department of Epidemiology, The University of Texas MD Anderson Cancer Center, Houston, TX, USA; Department of Family Medicine and Population Health, School of Medicine, Virginia Commonwealth University, VA, USA.
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6
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Berberine improves insulin resistance in adipocyte models by regulating the methylation of hypoxia-inducible factor-3α. Biosci Rep 2020; 39:220717. [PMID: 31652442 PMCID: PMC6822485 DOI: 10.1042/bsr20192059] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/18/2019] [Revised: 09/20/2019] [Accepted: 09/30/2019] [Indexed: 12/31/2022] Open
Abstract
Methylation of hypoxia-inducible factor-3α (HIF3A) was previously demonstrated to be highly associated with insulin resistance (IR) in patients with gestational diabetes mellitus (GDM). We aimed to study the therapeutic effects of Berberine (BBR) on GDM and the possible mechanisms. The expressions and methylated states of HIF3A in pregnant women with GDM were compared with that in healthy controls. The IR cell models of 3T3-L1 adipocytes was constructed by 1 μmol/l dexamethasone (Dex) and 1 μmol/l insulin (Ins). To evaluate the effects of BBR on IR adipocyte models, cells were subjected to BBR treatment at different concentrations. Transfection of HIF3A siRNA further confirmed the role of HIF3A in the BBR-induced improving effects. Low expression and high methylation of HIF3A gene were frequent in the GDM pregnancies. BBR treatment noticeably increased the glucose usage rates, adiponectin secretion and cell differentiation of IR 3T3-L1 adipocytes. Increased HIF3A expression and decreased methylated state of HIF3A were also found in IR adipocytes. Furthermore, HIF3A silencing not only reversed the effects of BBR on improving insulin sensibility, but also partially abolished the expression alterations of insulin-related genes in IR adipocytes induced by BBR treatment. Our results suggest that BBR improves insulin sensibility in IR adipocyte models, and the improving effects of BBR are possibly realized through the inhibition of HIF3A methylation.
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7
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Packer M. Autophagy-dependent and -independent modulation of oxidative and organellar stress in the diabetic heart by glucose-lowering drugs. Cardiovasc Diabetol 2020; 19:62. [PMID: 32404204 PMCID: PMC7222526 DOI: 10.1186/s12933-020-01041-4] [Citation(s) in RCA: 57] [Impact Index Per Article: 14.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/31/2019] [Accepted: 05/09/2020] [Indexed: 02/07/2023] Open
Abstract
Autophagy is a lysosome-dependent intracellular degradative pathway, which mediates the cellular adaptation to nutrient and oxygen depletion as well as to oxidative and endoplasmic reticulum stress. The molecular mechanisms that stimulate autophagy include the activation of energy deprivation sensors, sirtuin-1 (SIRT1) and adenosine monophosphate-activated protein kinase (AMPK). These enzymes not only promote organellar integrity directly, but they also enhance autophagic flux, which leads to the removal of dysfunctional mitochondria and peroxisomes. Type 2 diabetes is characterized by suppression of SIRT1 and AMPK signaling as well as an impairment of autophagy; these derangements contribute to an increase in oxidative stress and the development of cardiomyopathy. Antihyperglycemic drugs that signal through insulin may further suppress autophagy and worsen heart failure. In contrast, metformin and SGLT2 inhibitors activate SIRT1 and/or AMPK and promote autophagic flux to varying degrees in cardiomyocytes, which may explain their benefits in experimental cardiomyopathy. However, metformin and SGLT2 inhibitors differ meaningfully in the molecular mechanisms that underlie their effects on the heart. Whereas metformin primarily acts as an agonist of AMPK, SGLT2 inhibitors induce a fasting-like state that is accompanied by ketogenesis, a biomarker of enhanced SIRT1 signaling. Preferential SIRT1 activation may also explain the ability of SGLT2 inhibitors to stimulate erythropoiesis and reduce uric acid (a biomarker of oxidative stress)—effects that are not seen with metformin. Changes in both hematocrit and serum urate are the most important predictors of the ability of SGLT2 inhibitors to reduce the risk of cardiovascular death and hospitalization for heart failure in large-scale trials. Metformin and SGLT2 inhibitors may also differ in their ability to mitigate diabetes-related increases in intracellular sodium concentration and its adverse effects on mitochondrial functional integrity. Differences in the actions of SGLT2 inhibitors and metformin may reflect the distinctive molecular pathways that explain differences in the cardioprotective effects of these drugs.
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Affiliation(s)
- Milton Packer
- Baylor Heart and Vascular Institute, Baylor University Medical Center, 621 N. Hall Street, Dallas, TX, 75226, USA. .,Imperial College, London, UK.
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8
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Kulyté A, Lundbäck V, Lindgren CM, Luan J, Lotta LA, Langenberg C, Arner P, Strawbridge RJ, Dahlman I. Genome-wide association study of adipocyte lipolysis in the GENetics of adipocyte lipolysis (GENiAL) cohort. Mol Metab 2020; 34:85-96. [PMID: 32180562 PMCID: PMC7021539 DOI: 10.1016/j.molmet.2020.01.009] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/18/2019] [Revised: 12/25/2019] [Accepted: 01/15/2020] [Indexed: 12/17/2022] Open
Abstract
OBJECTIVES Lipolysis, hydrolysis of triglycerides to fatty acids in adipocytes, is tightly regulated, poorly understood, and, if perturbed, can lead to metabolic diseases including obesity and type 2 diabetes. The goal of this study was to identify the genetic regulators of lipolysis and elucidate their molecular mechanisms. METHODS Adipocytes from abdominal subcutaneous adipose tissue biopsies were isolated and were incubated without (spontaneous lipolysis) or with a catecholamine (stimulated lipolysis) to analyze lipolysis. DNA was extracted and genome-wide genotyping and imputation conducted. After quality control, 939 samples with genetic and lipolysis data were available. Genome-wide association studies of spontaneous and stimulated lipolysis were conducted. Subsequent in vitro gene expression analyses were used to identify candidate genes and explore their regulation of adipose tissue biology. RESULTS One locus on chromosome 19 demonstrated genome-wide significance with spontaneous lipolysis. 60 loci showed suggestive associations with spontaneous or stimulated lipolysis, of which many influenced both traits. In the chromosome 19 locus, only HIF3A was expressed in the adipocytes and displayed genotype-dependent gene expression. HIF3A knockdown in vitro increased lipolysis and the expression of key lipolysis-regulating genes. CONCLUSIONS In conclusion, we identified a genetic regulator of spontaneous lipolysis and provided evidence of HIF3A as a novel key regulator of lipolysis in subcutaneous adipocytes as the mechanism through which the locus influences adipose tissue biology.
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Affiliation(s)
- Agné Kulyté
- Lipid laboratory, Department of Medicine Huddinge, Karolinska Institute, Stockholm, Sweden
| | - Veroniqa Lundbäck
- Lipid laboratory, Department of Medicine Huddinge, Karolinska Institute, Stockholm, Sweden
| | - Cecilia M Lindgren
- Big Data Institute at the Li Ka Shing Center for Health Information and Discovery, University of Oxford, Oxford, UK; Wellcome Center for Human Genetics, Nuffield Department of Medicine, University of Oxford, Oxford, UK; National Institute for Health Research Oxford Biomedical Research Center, Oxford University Hospitals NHS Foundation Trust, John Radcliffe Hospital, Oxford, UK; Program in Medical and Population Genetics, Broad Institute, Cambridge, MA, USA
| | - Jian'an Luan
- MRC Epidemiology Unit, University of Cambridge, Cambridge, UK
| | - Luca A Lotta
- MRC Epidemiology Unit, University of Cambridge, Cambridge, UK
| | | | - Peter Arner
- Lipid laboratory, Department of Medicine Huddinge, Karolinska Institute, Stockholm, Sweden
| | - Rona J Strawbridge
- Institute of Health and Wellbeing, University of Glasgow, Glasgow, UK; Department of Medicine Solna, Karolinska Institute, Stockholm, Sweden; Health Data Research UK, UK
| | - Ingrid Dahlman
- Lipid laboratory, Department of Medicine Huddinge, Karolinska Institute, Stockholm, Sweden.
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9
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Mansell T, Ponsonby AL, Januar V, Novakovic B, Collier F, Burgner D, Vuillermin P, Ryan J, Saffery R. Early-life determinants of hypoxia-inducible factor 3A gene (HIF3A) methylation: a birth cohort study. Clin Epigenetics 2019; 11:96. [PMID: 31262346 PMCID: PMC6604333 DOI: 10.1186/s13148-019-0687-0] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/26/2018] [Accepted: 05/27/2019] [Indexed: 12/17/2022] Open
Abstract
Background Methylation of the hypoxia-inducible factor 3α gene (HIF3A) has been linked to pregnancy exposures, infant adiposity and later BMI. Genetic variation influences HIF3A methylation levels and may modify these relationships. However, data in very early life are limited, particularly in association with adverse pregnancy outcomes. We investigated the relationship between maternal and gestational factors, infant anthropometry, genetic variation and HIF3A DNA methylation in the Barwon Infant Study, a population-based birth cohort. Methylation of two previously studied regions of HIF3A were tested in the cord blood mononuclear cells of 938 infants. Results No compelling evidence was found of an association between birth weight, adiposity or maternal gestational diabetes with methylation at the most widely studied HIF3A region. Male sex (− 4.3%, p < 0.001) and pre-eclampsia (− 5.4%, p = 0.02) negatively associated with methylation at a second region of HIF3A; while positive associations were identified for gestational diabetes (4.8%, p = 0.01) and gestational age (1.2% increase per week, p < 0.001). HIF3A genetic variation also associated strongly with methylation at this region (p < 0.001). Conclusions Pre- and perinatal factors impact HIF3A methylation, including pre-eclampsia. This provides evidence that specific pregnancy complications, previously linked to adverse outcomes for both mother and child, impact the infant epigenome in a molecular pathway critical to several vascular and metabolic conditions. Further work is required to understand the mechanisms and clinical relevance, particularly the differing effects of in utero exposure to gestational diabetes or pre-eclampsia. Electronic supplementary material The online version of this article (10.1186/s13148-019-0687-0) contains supplementary material, which is available to authorized users.
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Affiliation(s)
- Toby Mansell
- Murdoch Children's Research Institute, Parkville, Australia.,Department of Paediatrics, University of Melbourne, Parkville, Australia
| | - Anne-Louise Ponsonby
- Murdoch Children's Research Institute, Parkville, Australia.,Department of Paediatrics, University of Melbourne, Parkville, Australia.,The Florey Institute of Neuroscience and Mental Health, Parkville, Australia
| | - Vania Januar
- Murdoch Children's Research Institute, Parkville, Australia
| | - Boris Novakovic
- Murdoch Children's Research Institute, Parkville, Australia.,Department of Paediatrics, University of Melbourne, Parkville, Australia
| | - Fiona Collier
- Murdoch Children's Research Institute, Parkville, Australia.,School of Medicine, Deakin University, Geelong, Australia.,Child Health Research Unit, Barwon Health, Geelong, Australia
| | - David Burgner
- Murdoch Children's Research Institute, Parkville, Australia.,Department of Paediatrics, University of Melbourne, Parkville, Australia.,Department of Paediatrics, Monash University, Clayton, Australia
| | - Peter Vuillermin
- Murdoch Children's Research Institute, Parkville, Australia.,School of Medicine, Deakin University, Geelong, Australia.,Child Health Research Unit, Barwon Health, Geelong, Australia
| | - Joanne Ryan
- Murdoch Children's Research Institute, Parkville, Australia.,School of Public Health & Preventive Medicine, Monash University, Melbourne, Australia
| | - Richard Saffery
- Murdoch Children's Research Institute, Parkville, Australia. .,Department of Paediatrics, University of Melbourne, Parkville, Australia.
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10
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Chu A, Casero D, Thamotharan S, Wadehra M, Cosi A, Devaskar SU. The Placental Transcriptome in Late Gestational Hypoxia Resulting in Murine Intrauterine Growth Restriction Parallels Increased Risk of Adult Cardiometabolic Disease. Sci Rep 2019; 9:1243. [PMID: 30718791 PMCID: PMC6361888 DOI: 10.1038/s41598-018-37627-y] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/15/2018] [Accepted: 12/11/2018] [Indexed: 12/19/2022] Open
Abstract
Intrauterine growth restriction (IUGR) enhances risk for adult onset cardiovascular disease (CVD). The mechanisms underlying IUGR are poorly understood, though inadequate blood flow and oxygen/nutrient provision are considered common endpoints. Based on evidence in humans linking IUGR to adult CVD, we hypothesized that in murine pregnancy, maternal late gestational hypoxia (LG-H) exposure resulting in IUGR would result in (1) placental transcriptome changes linked to risk for later CVD, and 2) adult phenotypes of CVD in the IUGR offspring. After subjecting pregnant mice to hypoxia (10.5% oxygen) from gestational day (GD) 14.5 to 18.5, we undertook RNA sequencing from GD19 placentas. Functional analysis suggested multiple changes in structural and functional genes important for placental health and function, with maximal dysregulation involving vascular and nutrient transport pathways. Concordantly, a ~10% decrease in birthweights and ~30% decrease in litter size was observed, supportive of placental insufficiency. We also found that the LG-H IUGR offspring exhibit increased risk for CVD at 4 months of age, manifesting as hypertension, increased abdominal fat, elevated leptin and total cholesterol concentrations. In summary, this animal model of IUGR links the placental transcriptional response to the stressor of gestational hypoxia to increased risk of developing cardiometabolic disease.
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Affiliation(s)
- Alison Chu
- David Geffen School of Medicine at UCLA, Department of Pediatrics, Division of Neonatology & Developmental Biology, Neonatal Research Center of the UCLA Children's Discovery and Innovation Institute, 10833 Le Conte Avenue, MDCC B2-375, Los Angeles, CA, 90095, USA.
| | - David Casero
- David Geffen School of Medicine at UCLA, Department of Pathology and Laboratory Medicine, 3000 Terasaki Life Sciences Building, 610 Charles Young Drive East, Los Angeles, CA, 90095, USA.
| | - Shanthie Thamotharan
- David Geffen School of Medicine at UCLA, Department of Pediatrics, Division of Neonatology & Developmental Biology, Neonatal Research Center of the UCLA Children's Discovery and Innovation Institute, 10833 Le Conte Avenue, MDCC B2-375, Los Angeles, CA, 90095, USA
| | - Madhuri Wadehra
- David Geffen School of Medicine at UCLA, Department of Pathology and Laboratory Medicine, 4525 MacDonald Research Laboratories, Los Angeles, CA, 90095, USA
| | - Amy Cosi
- David Geffen School of Medicine at UCLA, Department of Pediatrics, Division of Neonatology & Developmental Biology, Neonatal Research Center of the UCLA Children's Discovery and Innovation Institute, 10833 Le Conte Avenue, MDCC B2-375, Los Angeles, CA, 90095, USA
| | - Sherin U Devaskar
- David Geffen School of Medicine at UCLA, Department of Pediatrics, Division of Neonatology & Developmental Biology, Neonatal Research Center of the UCLA Children's Discovery and Innovation Institute, 10833 Le Conte Avenue, MDCC B2-375, Los Angeles, CA, 90095, USA
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11
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Cuomo F, Coppola A, Botti C, Maione C, Forte A, Scisciola L, Liguori G, Caiafa I, Ursini MV, Galderisi U, Cipollaro M, Altucci L, Cobellis G. Pro-inflammatory cytokines activate hypoxia-inducible factor 3α via epigenetic changes in mesenchymal stromal/stem cells. Sci Rep 2018; 8:5842. [PMID: 29643458 PMCID: PMC5895792 DOI: 10.1038/s41598-018-24221-5] [Citation(s) in RCA: 19] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/28/2017] [Accepted: 03/23/2018] [Indexed: 11/09/2022] Open
Abstract
Human mesenchymal stromal/stem cells (hMSCs) emerged as a promising therapeutic tool for ischemic disorders, due to their ability to regenerate damaged tissues, promote angiogenesis and reduce inflammation, leading to encouraging, but still limited results. The outcomes in clinical trials exploring hMSC therapy are influenced by low cell retention and survival in affected tissues, partially influenced by lesion's microenvironment, where low oxygen conditions (i.e. hypoxia) and inflammation coexist. Hypoxia and inflammation are pathophysiological stresses, sharing common activators, such as hypoxia-inducible factors (HIFs) and NF-κB. HIF1α and HIF2α respond essentially to hypoxia, activating pathways involved in tissue repair. Little is known about the regulation of HIF3α. Here we investigated the role of HIF3α in vitro and in vivo. Human MSCs expressed HIF3α, differentially regulated by pro-inflammatory cytokines in an oxygen-independent manner, a novel and still uncharacterized mechanism, where NF-κB is critical for its expression. We investigated if epigenetic modifications are involved in HIF3α expression by methylation-specific PCR and histone modifications. Robust hypermethylation of histone H3 was observed across HIF3A locus driven by pro-inflammatory cytokines. Experiments in a murine model of arteriotomy highlighted the activation of Hif3α expression in infiltrated inflammatory cells, suggesting a new role for Hif3α in inflammation in vivo.
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Affiliation(s)
- Francesca Cuomo
- Department of Biochemistry, Biophysics and General Pathology, Università degli Studi della Campania L. Vanvitelli, Via L. De Crecchio, 7, 80138, Naples, Italy
| | - Antonietta Coppola
- Department of Biochemistry, Biophysics and General Pathology, Università degli Studi della Campania L. Vanvitelli, Via L. De Crecchio, 7, 80138, Naples, Italy
| | - Chiara Botti
- Department of Biochemistry, Biophysics and General Pathology, Università degli Studi della Campania L. Vanvitelli, Via L. De Crecchio, 7, 80138, Naples, Italy
- Laboratorio di Patologia Clinica, Ospedale Santobono, Via M. Fiore 6, 80129, Naples, Italy
| | - Ciro Maione
- Department of Biochemistry, Biophysics and General Pathology, Università degli Studi della Campania L. Vanvitelli, Via L. De Crecchio, 7, 80138, Naples, Italy
| | - Amalia Forte
- Department of Experimental Medicine, Università degli Studi della Campania L. Vanvitelli, Via L. De Crecchio, 7, 80138, Naples, Italy
| | - Lucia Scisciola
- Department of Biochemistry, Biophysics and General Pathology, Università degli Studi della Campania L. Vanvitelli, Via L. De Crecchio, 7, 80138, Naples, Italy
| | - Giuseppina Liguori
- Istituto Nazionale Tumori, Struttura Complessa Oncologia Medica Melanoma Immunoterapia Oncologica e Terapia Innovativa, Via M. Semmola, 80131, Naples, Italy
| | - Ilaria Caiafa
- Department of Biochemistry, Biophysics and General Pathology, Università degli Studi della Campania L. Vanvitelli, Via L. De Crecchio, 7, 80138, Naples, Italy
| | - Matilde Valeria Ursini
- Institute of Genetics and Biophysics, 'A. Buzzati-Traverso' (IGB), via P. Castellino, 111, 80131, Naples, Italy
| | - Umberto Galderisi
- Department of Experimental Medicine, Università degli Studi della Campania L. Vanvitelli, Via L. De Crecchio, 7, 80138, Naples, Italy
| | - Marilena Cipollaro
- Department of Experimental Medicine, Università degli Studi della Campania L. Vanvitelli, Via L. De Crecchio, 7, 80138, Naples, Italy
| | - Lucia Altucci
- Department of Biochemistry, Biophysics and General Pathology, Università degli Studi della Campania L. Vanvitelli, Via L. De Crecchio, 7, 80138, Naples, Italy
| | - Gilda Cobellis
- Department of Biochemistry, Biophysics and General Pathology, Università degli Studi della Campania L. Vanvitelli, Via L. De Crecchio, 7, 80138, Naples, Italy.
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12
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Recent progress in genetics, epigenetics and metagenomics unveils the pathophysiology of human obesity. Clin Sci (Lond) 2017; 130:943-86. [PMID: 27154742 DOI: 10.1042/cs20160136] [Citation(s) in RCA: 227] [Impact Index Per Article: 32.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/09/2015] [Accepted: 02/24/2016] [Indexed: 12/19/2022]
Abstract
In high-, middle- and low-income countries, the rising prevalence of obesity is the underlying cause of numerous health complications and increased mortality. Being a complex and heritable disorder, obesity results from the interplay between genetic susceptibility, epigenetics, metagenomics and the environment. Attempts at understanding the genetic basis of obesity have identified numerous genes associated with syndromic monogenic, non-syndromic monogenic, oligogenic and polygenic obesity. The genetics of leanness are also considered relevant as it mirrors some of obesity's aetiologies. In this report, we summarize ten genetically elucidated obesity syndromes, some of which are involved in ciliary functioning. We comprehensively review 11 monogenic obesity genes identified to date and their role in energy maintenance as part of the leptin-melanocortin pathway. With the emergence of genome-wide association studies over the last decade, 227 genetic variants involved in different biological pathways (central nervous system, food sensing and digestion, adipocyte differentiation, insulin signalling, lipid metabolism, muscle and liver biology, gut microbiota) have been associated with polygenic obesity. Advances in obligatory and facilitated epigenetic variation, and gene-environment interaction studies have partly accounted for the missing heritability of obesity and provided additional insight into its aetiology. The role of gut microbiota in obesity pathophysiology, as well as the 12 genes associated with lipodystrophies is discussed. Furthermore, in an attempt to improve future studies and merge the gap between research and clinical practice, we provide suggestions on how high-throughput '-omic' data can be integrated in order to get closer to the new age of personalized medicine.
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13
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Cheung OKW, Cheng ASL. Gender Differences in Adipocyte Metabolism and Liver Cancer Progression. Front Genet 2016; 7:168. [PMID: 27703473 PMCID: PMC5029146 DOI: 10.3389/fgene.2016.00168] [Citation(s) in RCA: 31] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/19/2016] [Accepted: 09/05/2016] [Indexed: 12/12/2022] Open
Abstract
Liver cancer is the third most common cancer type and the second leading cause of deaths in men. Large population studies have demonstrated remarkable gender disparities in the incidence and the cumulative risk of liver cancer. A number of emerging risk factors regarding metabolic alterations associated with obesity, diabetes and dyslipidemia have been ascribed to the progression of non-alcoholic fatty liver diseases (NAFLD) and ultimately liver cancer. The deregulation of fat metabolism derived from excessive insulin, glucose, and lipid promotes cancer-causing inflammatory signaling and oxidative stress, which eventually triggers the uncontrolled hepatocellular proliferation. This review presents the current standing on the gender differences in body fat compositions and their mechanistic linkage with the development of NAFLD-related liver cancer, with an emphasis on genetic, epigenetic and microRNA control. The potential roles of sex hormones in instructing adipocyte metabolic programs may help unravel the mechanisms underlying gender dimorphism in liver cancer and identify the metabolic targets for disease management.
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Affiliation(s)
- Otto K-W Cheung
- School of Biomedical Sciences, The Chinese University of Hong Kong Hong Kong, China
| | - Alfred S-L Cheng
- School of Biomedical Sciences, The Chinese University of Hong Kong Hong Kong, China; State Key Laboratory of Digestive Disease, The Chinese University of Hong Kong Hong Kong, China
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14
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Main AM, Gillberg L, Jacobsen AL, Nilsson E, Gjesing AP, Hansen T, Pedersen O, Ribel-Madsen R, Vaag A. DNA methylation and gene expression of HIF3A: cross-tissue validation and associations with BMI and insulin resistance. Clin Epigenetics 2016; 8:89. [PMID: 27594926 PMCID: PMC5010678 DOI: 10.1186/s13148-016-0258-6] [Citation(s) in RCA: 32] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/25/2016] [Accepted: 08/24/2016] [Indexed: 12/17/2022] Open
Abstract
Background Associations between BMI and DNA methylation of hypoxia-inducible factor 3-alpha (HIF3A) in both blood cells and subcutaneous adipose tissue (SAT) have been reported. In this study, we investigated associations between BMI and HIF3A DNA methylation in the blood and SAT from the same individuals, and whether HIF3A gene expression in SAT and skeletal muscle biopsies showed associations with BMI and insulin resistance. Furthermore, we aimed to investigate gender specificity and heritability of these traits. Methods We studied 137 first-degree relatives of type 2 diabetes (T2D) patients from 48 families, from whom we had SAT and muscle biopsies. DNA methylation of four CpG sites in the HIF3A promoter was analyzed in the blood and SAT by pyrosequencing, and HIF3A gene expression was analyzed in SAT and muscle by qPCR. An index of whole-body insulin sensitivity was estimated from oral glucose tolerance tests. Results BMI was associated with HIF3A methylation at one CpG site in the blood, and there was a positive association between the blood and SAT methylation levels at a different CpG site within the individuals. The SAT methylation level did not correlate with HIF3A gene expression. Interestingly, HIF3A expression in SAT, but not in muscle, associated negatively with BMI and whole-body insulin resistance. We found a significant effect of familiality on HIF3A methylation levels in the blood and HIF3A expression levels in skeletal muscle. Conclusions Our findings are in line with the previously reported link between BMI and DNA methylation of HIF3A in the blood. The tissue-specific results of HIF3A gene expression indicate that SAT is the more functional tissue in which a low expression may adversely affect whole-body insulin sensitivity. Electronic supplementary material The online version of this article (doi:10.1186/s13148-016-0258-6) contains supplementary material, which is available to authorized users.
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Affiliation(s)
- Ailsa Maria Main
- Department of Endocrinology, Rigshospitalet, Section 7652, Tagensvej 20, DK-2200 Copenhagen, Denmark
| | - Linn Gillberg
- Department of Endocrinology, Rigshospitalet, Section 7652, Tagensvej 20, DK-2200 Copenhagen, Denmark.,Faculty of Health and Medical Sciences, University of Copenhagen, Copenhagen, Denmark
| | - Anna Louisa Jacobsen
- Department of Endocrinology, Rigshospitalet, Section 7652, Tagensvej 20, DK-2200 Copenhagen, Denmark
| | - Emma Nilsson
- Department of Endocrinology, Rigshospitalet, Section 7652, Tagensvej 20, DK-2200 Copenhagen, Denmark.,Department of Clinical Sciences, Lund University Diabetes Centre, Malmö, Sweden
| | - Anette Prior Gjesing
- Section of Metabolic Genetics, The Novo Nordisk Foundation Center for Basic Metabolic Research, Faculty of Health and Medical Sciences, University of Copenhagen, Copenhagen, Denmark
| | - Torben Hansen
- Section of Metabolic Genetics, The Novo Nordisk Foundation Center for Basic Metabolic Research, Faculty of Health and Medical Sciences, University of Copenhagen, Copenhagen, Denmark
| | - Oluf Pedersen
- Section of Metabolic Genetics, The Novo Nordisk Foundation Center for Basic Metabolic Research, Faculty of Health and Medical Sciences, University of Copenhagen, Copenhagen, Denmark
| | - Rasmus Ribel-Madsen
- Department of Endocrinology, Rigshospitalet, Section 7652, Tagensvej 20, DK-2200 Copenhagen, Denmark.,The Danish Diabetes Academy, Odense University Hospital, Odense, Denmark
| | - Allan Vaag
- Department of Endocrinology, Rigshospitalet, Section 7652, Tagensvej 20, DK-2200 Copenhagen, Denmark.,Faculty of Health and Medical Sciences, University of Copenhagen, Copenhagen, Denmark
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15
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A HIF-1α-driven feed-forward loop augments HIF signalling in Hep3B cells by upregulation of ARNT. Cell Death Dis 2016; 7:e2284. [PMID: 27362802 PMCID: PMC5108338 DOI: 10.1038/cddis.2016.187] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/07/2016] [Revised: 06/01/2016] [Accepted: 06/03/2016] [Indexed: 02/07/2023]
Abstract
Oxygen-deprived (hypoxic) areas are commonly found within neoplasms caused by excessive cell proliferation. The transcription factor Aryl hydrocarbon receptor nuclear translocator (ARNT) is part of the hypoxia-inducible factor (HIF) pathway, which mediates adaptive responses to ensure cellular survival under hypoxic conditions. HIF signalling leads to metabolic alterations, invasion/metastasis and the induction of angiogenesis in addition to radio-chemoresistance of tumour cells. Activation of the HIF pathway is based on the abundance of HIF-α subunits, which are regulated in an oxygen-dependent manner and form transcriptional active complexes with ARNT or ARNT2 (also referred as HIF-1β and HIF-2β, respectively). ARNT is considered to be unaffected by hypoxia but certain cell lines, including Hep3B cells, are capable to elevate this transcription factor in response to oxygen deprivation, which implies an advantage. Therefore, the aim of this study was to elucidate the mechanism of hypoxia-dependent ARNT upregulation and to determine implications on HIF signalling. Gene silencing and overexpression techniques were used to alter the expression pattern of HIF transcription factors under normoxic and hypoxic conditions. qRT-PCR and western blotting were performed to measure gene and protein expression, respectively. HIF activity was determined by reporter gene assays. The results revealed a HIF-1α-dependent mechanism leading to ARNT upregulation in hypoxia. Forced expression of ARNT increased reporter activity under normoxic and hypoxic conditions. In conclusion, these findings indicate a novel feed-forward loop and suggest that ARNT might be a limiting factor. Augmented HIF signalling in terms of elevated target gene expression might be advantageous for tumour cells.
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16
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Pfeiffer S, Krüger J, Maierhofer A, Böttcher Y, Klöting N, El Hajj N, Schleinitz D, Schön MR, Dietrich A, Fasshauer M, Lohmann T, Dreßler M, Stumvoll M, Haaf T, Blüher M, Kovacs P. Hypoxia-inducible factor 3A gene expression and methylation in adipose tissue is related to adipose tissue dysfunction. Sci Rep 2016; 6:27969. [PMID: 27346320 PMCID: PMC4921806 DOI: 10.1038/srep27969] [Citation(s) in RCA: 46] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/20/2015] [Accepted: 05/26/2016] [Indexed: 12/17/2022] Open
Abstract
Recently, a genome-wide analysis identified DNA methylation of the HIF3A (hypoxia-inducible factor 3A) as strongest correlate of BMI. Here we tested the hypothesis that HIF3A mRNA expression and CpG-sites methylation in adipose tissue (AT) and genetic variants in HIF3A are related to parameters of AT distribution and function. In paired samples of subcutaneous AT (SAT) and visceral AT (VAT) from 603 individuals, we measured HIF3A mRNA expression and analyzed its correlation with obesity and related traits. In subgroups of individuals, we investigated the effects on HIF3A genetic variants on its AT expression (N = 603) and methylation of CpG-sites (N = 87). HIF3A expression was significantly higher in SAT compared to VAT and correlated with obesity and parameters of AT dysfunction (including CRP and leucocytes count). HIF3A methylation at cg22891070 was significantly higher in VAT compared to SAT and correlated with BMI, abdominal SAT and VAT area. Rs8102595 showed a nominal significant association with AT HIF3A methylation levels as well as with obesity and fat distribution. HIF3A expression and methylation in AT are fat depot specific, related to obesity and AT dysfunction. Our data support the hypothesis that HIF pathways may play an important role in the development of AT dysfunction in obesity.
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Affiliation(s)
- Susanne Pfeiffer
- Department of Medicine, Dermatology und Neurology, Department of Endocrinology und Nephrology, University of Leipzig, Leipzig, Germany
| | - Jacqueline Krüger
- Leipzig University Medical Center, IFB AdiposityDiseases, University of Leipzig, Leipzig, Germany
| | - Anna Maierhofer
- Institute of Human Genetics, University of Würzburg, Würzburg, Germany
| | - Yvonne Böttcher
- Leipzig University Medical Center, IFB AdiposityDiseases, University of Leipzig, Leipzig, Germany
| | - Nora Klöting
- Department of Medicine, Dermatology und Neurology, Department of Endocrinology und Nephrology, University of Leipzig, Leipzig, Germany
- Leipzig University Medical Center, IFB AdiposityDiseases, University of Leipzig, Leipzig, Germany
| | - Nady El Hajj
- Institute of Human Genetics, University of Würzburg, Würzburg, Germany
| | - Dorit Schleinitz
- Leipzig University Medical Center, IFB AdiposityDiseases, University of Leipzig, Leipzig, Germany
| | - Michael R. Schön
- Clinic of Visceral Surgery, Städtisches Klinikum Karlsruhe, Karlsruhe, Germany
| | - Arne Dietrich
- Leipzig University Medical Center, IFB AdiposityDiseases, University of Leipzig, Leipzig, Germany
- Department of Surgery, University of Leipzig, Leipzig, Germany
| | - Mathias Fasshauer
- Department of Medicine, Dermatology und Neurology, Department of Endocrinology und Nephrology, University of Leipzig, Leipzig, Germany
- Leipzig University Medical Center, IFB AdiposityDiseases, University of Leipzig, Leipzig, Germany
| | | | | | - Michael Stumvoll
- Department of Medicine, Dermatology und Neurology, Department of Endocrinology und Nephrology, University of Leipzig, Leipzig, Germany
| | - Thomas Haaf
- Institute of Human Genetics, University of Würzburg, Würzburg, Germany
| | - Matthias Blüher
- Department of Medicine, Dermatology und Neurology, Department of Endocrinology und Nephrology, University of Leipzig, Leipzig, Germany
| | - Peter Kovacs
- Leipzig University Medical Center, IFB AdiposityDiseases, University of Leipzig, Leipzig, Germany
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17
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Thomson EM, Pal S, Guénette J, Wade MG, Atlas E, Holloway AC, Williams A, Vincent R. Ozone Inhalation Provokes Glucocorticoid-Dependent and -Independent Effects on Inflammatory and Metabolic Pathways. Toxicol Sci 2016; 152:17-28. [DOI: 10.1093/toxsci/kfw061] [Citation(s) in RCA: 45] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022] Open
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18
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Duan C. Hypoxia-inducible factor 3 biology: complexities and emerging themes. Am J Physiol Cell Physiol 2016; 310:C260-9. [DOI: 10.1152/ajpcell.00315.2015] [Citation(s) in RCA: 140] [Impact Index Per Article: 17.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
Abstract
The hypoxia-inducible factor (HIF) family has three distinct members in most vertebrates. All three HIFs consist of a unique and oxygen-labile α-subunit and a common and stable β-subunit. While HIF-1 and HIF-2 function as master regulators of the transcriptional response to hypoxia, much less is known about HIF-3. The HIF-3α gene gives rise to multiple HIF-3α variants due to the utilization of different promoters, different transcription initiation sites, and alternative splicing. These HIF-3α variants are expressed in different tissues, at different developmental stages, and are differentially regulated by hypoxia and other factors. Recent studies suggest that different HIF-3α variants have different and even opposite functions. There is strong evidence that full-length HIF-3α protein functions as an oxygen-regulated transcription activator and that it activates a unique transcriptional program in response to hypoxia. Many HIF-3α target genes have been identified. While some short HIF-3α variants act as dominant-negative regulators of HIF-1/2α actions, other HIF-3α variants can inhibit HIF-1/2α actions by competing for the common HIF-β. There are also a number of HIF-3α variants yet to be explored. Future studies of these naturally occurring HIF-3α variants will provide new and important insights into HIF biology and may lead to the development of new therapeutic strategies.
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Affiliation(s)
- Cunming Duan
- Department of Molecular, Cellular, and Developmental Biology, University of Michigan, Ann Arbor, Michigan
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19
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Wang S, Song J, Yang Y, Zhang Y, Wang H, Ma J. HIF3A DNA Methylation Is Associated with Childhood Obesity and ALT. PLoS One 2015; 10:e0145944. [PMID: 26717317 PMCID: PMC4696784 DOI: 10.1371/journal.pone.0145944] [Citation(s) in RCA: 47] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/31/2015] [Accepted: 12/10/2015] [Indexed: 12/18/2022] Open
Abstract
Gene polymorphisms associated so far with body mass index (BMI) can explain only 1.18–1.45% of observed variation in BMI. Recent studies suggest that epigenetic modifications, especially DNA methylation, could contribute to explain part of the missing heritability, and two epigenetic genome-wide analysis studies (EWAS) have reported that Hypoxia Inducible Factor 3 Alpha Subunit (HIF3A) methylation was associated with BMI or BMI change. We therefore assessed whether the HIF3A methylation is associated with obesity and other obesity-related phenotypes in Chinese children. The subjects included 110 severe obese cases aged 7–17y and 110 normal-weight controls matched by age and gender for measurement of blood DNA methylation levels at the HIF3A gene locus using the Sequenom’s MassARRAY system. We observed significantly higher methylation levels in obese children than in controls at positions 46801642 and 46801699 in HIF3A gene (P<0.05), and found positive associations between methylation and alanine aminotransferase (ALT) levels adjusted by gender, age and BMI at the position 46801699 (r = 0.226, P = 0.007). These results suggest that HIF3A DNA methylation is associated with childhood obesity, and has a BMI-independent association with ALT. The results provide evidence for identifying epigenetic factors of elivated ALT and may be useful for risk assessment and personalized medicine of liver diseases such as non-alcoholic fatty liver disease (NAFLD).
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Affiliation(s)
- Shuo Wang
- Institute of Child and Adolescent Health, School of Public Health, Peking University, Beijing, China
| | - Jieyun Song
- Institute of Child and Adolescent Health, School of Public Health, Peking University, Beijing, China
| | - Yide Yang
- Institute of Child and Adolescent Health, School of Public Health, Peking University, Beijing, China
| | - Yining Zhang
- Institute of Child and Adolescent Health, School of Public Health, Peking University, Beijing, China
| | - Haijun Wang
- Institute of Child and Adolescent Health, School of Public Health, Peking University, Beijing, China
| | - Jun Ma
- Institute of Child and Adolescent Health, School of Public Health, Peking University, Beijing, China
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20
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Frahm KA, Peffer ME, Zhang JY, Luthra S, Chakka AB, Couger MB, Chandran UR, Monaghan AP, DeFranco DB. Research Resource: The Dexamethasone Transcriptome in Hypothalamic Embryonic Neural Stem Cells. Mol Endocrinol 2015; 30:144-54. [PMID: 26606517 DOI: 10.1210/me.2015-1258] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022] Open
Abstract
Exposure to excess glucocorticoids during fetal development has long-lasting physiological and behavioral consequences, although the mechanisms are poorly understood. The impact of prenatal glucocorticoids exposure on stress responses in juvenile and adult offspring implicates the developing hypothalamus as a target of adverse prenatal glucocorticoid action. Therefore, primary cultures of hypothalamic neural-progenitor/stem cells (NPSCs) derived from mouse embryos (embryonic day 14.5) were used to identify the glucocorticoid transcriptome in both males and females. NPSCs were treated with vehicle or the synthetic glucocorticoid dexamethasone (dex; 100nM) for 4 hours and total RNA analyzed using RNA-Sequencing. Bioinformatic analysis demonstrated that primary hypothalamic NPSC cultures expressed relatively high levels of a number of genes regulating stem cell proliferation and hypothalamic progenitor function. Interesting, although these cells express glucocorticoid receptors (GRs), only low levels of sex-steroid receptors are expressed, which suggested that sex-specific differentially regulated genes identified are mediated by genetic and not hormonal influences. We also identified known or novel GR-target coding and noncoding genes that are either regulated equivalently in male and female NPSCs or differential responsiveness in one sex. Using gene ontology analysis, the top functional network identified was cell proliferation and using bromodeoxyuridine (BrdU) incorporation observed a reduction in proliferation of hypothalamic NPSCs after dexamethasone treatment. Our studies provide the first characterization and description of glucocorticoid-regulated pathways in male and female embryonically derived hypothalamic NPSCs and identified GR-target genes during hypothalamic development. These findings may provide insight into potential mechanisms responsible for the long-term consequences of fetal glucocorticoid exposure in adulthood.
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Affiliation(s)
- Krystle A Frahm
- Department of Pharmacology and Chemical Biology (K.A.F., J.Y.Z., D.B.D.), University of Pittsburgh School of Medicine, Pittsburgh, Pennsylvania; Program in Integrative Molecular Biology (M.E.P., D.B.D.), University of Pittsburgh, Pittsburgh, Pennsylvania; Department of Biomedical Informatics (S.L., A.B.C., U.R.C.), University of Pittsburgh, Pittsburgh, Pennsylvania; Department of Microbiology and Molecular Genetics (M.B.C.), Oklahoma State University, Stillwater, Oklahoma; and Department of Neurobiology (A.P.M.), University of Pittsburgh, Pittsburgh, Pennsylvania
| | - Melanie E Peffer
- Department of Pharmacology and Chemical Biology (K.A.F., J.Y.Z., D.B.D.), University of Pittsburgh School of Medicine, Pittsburgh, Pennsylvania; Program in Integrative Molecular Biology (M.E.P., D.B.D.), University of Pittsburgh, Pittsburgh, Pennsylvania; Department of Biomedical Informatics (S.L., A.B.C., U.R.C.), University of Pittsburgh, Pittsburgh, Pennsylvania; Department of Microbiology and Molecular Genetics (M.B.C.), Oklahoma State University, Stillwater, Oklahoma; and Department of Neurobiology (A.P.M.), University of Pittsburgh, Pittsburgh, Pennsylvania
| | - Janie Y Zhang
- Department of Pharmacology and Chemical Biology (K.A.F., J.Y.Z., D.B.D.), University of Pittsburgh School of Medicine, Pittsburgh, Pennsylvania; Program in Integrative Molecular Biology (M.E.P., D.B.D.), University of Pittsburgh, Pittsburgh, Pennsylvania; Department of Biomedical Informatics (S.L., A.B.C., U.R.C.), University of Pittsburgh, Pittsburgh, Pennsylvania; Department of Microbiology and Molecular Genetics (M.B.C.), Oklahoma State University, Stillwater, Oklahoma; and Department of Neurobiology (A.P.M.), University of Pittsburgh, Pittsburgh, Pennsylvania
| | - Soumya Luthra
- Department of Pharmacology and Chemical Biology (K.A.F., J.Y.Z., D.B.D.), University of Pittsburgh School of Medicine, Pittsburgh, Pennsylvania; Program in Integrative Molecular Biology (M.E.P., D.B.D.), University of Pittsburgh, Pittsburgh, Pennsylvania; Department of Biomedical Informatics (S.L., A.B.C., U.R.C.), University of Pittsburgh, Pittsburgh, Pennsylvania; Department of Microbiology and Molecular Genetics (M.B.C.), Oklahoma State University, Stillwater, Oklahoma; and Department of Neurobiology (A.P.M.), University of Pittsburgh, Pittsburgh, Pennsylvania
| | - Anish B Chakka
- Department of Pharmacology and Chemical Biology (K.A.F., J.Y.Z., D.B.D.), University of Pittsburgh School of Medicine, Pittsburgh, Pennsylvania; Program in Integrative Molecular Biology (M.E.P., D.B.D.), University of Pittsburgh, Pittsburgh, Pennsylvania; Department of Biomedical Informatics (S.L., A.B.C., U.R.C.), University of Pittsburgh, Pittsburgh, Pennsylvania; Department of Microbiology and Molecular Genetics (M.B.C.), Oklahoma State University, Stillwater, Oklahoma; and Department of Neurobiology (A.P.M.), University of Pittsburgh, Pittsburgh, Pennsylvania
| | - Matthew B Couger
- Department of Pharmacology and Chemical Biology (K.A.F., J.Y.Z., D.B.D.), University of Pittsburgh School of Medicine, Pittsburgh, Pennsylvania; Program in Integrative Molecular Biology (M.E.P., D.B.D.), University of Pittsburgh, Pittsburgh, Pennsylvania; Department of Biomedical Informatics (S.L., A.B.C., U.R.C.), University of Pittsburgh, Pittsburgh, Pennsylvania; Department of Microbiology and Molecular Genetics (M.B.C.), Oklahoma State University, Stillwater, Oklahoma; and Department of Neurobiology (A.P.M.), University of Pittsburgh, Pittsburgh, Pennsylvania
| | - Uma R Chandran
- Department of Pharmacology and Chemical Biology (K.A.F., J.Y.Z., D.B.D.), University of Pittsburgh School of Medicine, Pittsburgh, Pennsylvania; Program in Integrative Molecular Biology (M.E.P., D.B.D.), University of Pittsburgh, Pittsburgh, Pennsylvania; Department of Biomedical Informatics (S.L., A.B.C., U.R.C.), University of Pittsburgh, Pittsburgh, Pennsylvania; Department of Microbiology and Molecular Genetics (M.B.C.), Oklahoma State University, Stillwater, Oklahoma; and Department of Neurobiology (A.P.M.), University of Pittsburgh, Pittsburgh, Pennsylvania
| | - A Paula Monaghan
- Department of Pharmacology and Chemical Biology (K.A.F., J.Y.Z., D.B.D.), University of Pittsburgh School of Medicine, Pittsburgh, Pennsylvania; Program in Integrative Molecular Biology (M.E.P., D.B.D.), University of Pittsburgh, Pittsburgh, Pennsylvania; Department of Biomedical Informatics (S.L., A.B.C., U.R.C.), University of Pittsburgh, Pittsburgh, Pennsylvania; Department of Microbiology and Molecular Genetics (M.B.C.), Oklahoma State University, Stillwater, Oklahoma; and Department of Neurobiology (A.P.M.), University of Pittsburgh, Pittsburgh, Pennsylvania
| | - Donald B DeFranco
- Department of Pharmacology and Chemical Biology (K.A.F., J.Y.Z., D.B.D.), University of Pittsburgh School of Medicine, Pittsburgh, Pennsylvania; Program in Integrative Molecular Biology (M.E.P., D.B.D.), University of Pittsburgh, Pittsburgh, Pennsylvania; Department of Biomedical Informatics (S.L., A.B.C., U.R.C.), University of Pittsburgh, Pittsburgh, Pennsylvania; Department of Microbiology and Molecular Genetics (M.B.C.), Oklahoma State University, Stillwater, Oklahoma; and Department of Neurobiology (A.P.M.), University of Pittsburgh, Pittsburgh, Pennsylvania
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Demerath EW, Guan W, Grove ML, Aslibekyan S, Mendelson M, Zhou YH, Hedman ÅK, Sandling JK, Li LA, Irvin MR, Zhi D, Deloukas P, Liang L, Liu C, Bressler J, Spector TD, North K, Li Y, Absher DM, Levy D, Arnett DK, Fornage M, Pankow JS, Boerwinkle E. Epigenome-wide association study (EWAS) of BMI, BMI change and waist circumference in African American adults identifies multiple replicated loci. Hum Mol Genet 2015; 24:4464-79. [PMID: 25935004 DOI: 10.1093/hmg/ddv161] [Citation(s) in RCA: 230] [Impact Index Per Article: 25.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/05/2015] [Accepted: 04/13/2015] [Indexed: 02/06/2023] Open
Abstract
Obesity is an important component of the pathophysiology of chronic diseases. Identifying epigenetic modifications associated with elevated adiposity, including DNA methylation variation, may point to genomic pathways that are dysregulated in numerous conditions. The Illumina 450K Bead Chip array was used to assay DNA methylation in leukocyte DNA obtained from 2097 African American adults in the Atherosclerosis Risk in Communities (ARIC) study. Mixed-effects regression models were used to test the association of methylation beta value with concurrent body mass index (BMI) and waist circumference (WC), and BMI change, adjusting for batch effects and potential confounders. Replication using whole-blood DNA from 2377 White adults in the Framingham Heart Study and CD4+ T cell DNA from 991 Whites in the Genetics of Lipid Lowering Drugs and Diet Network Study was followed by testing using adipose tissue DNA from 648 women in the Multiple Tissue Human Expression Resource cohort. Seventy-six BMI-related probes, 164 WC-related probes and 8 BMI change-related probes passed the threshold for significance in ARIC (P < 1 × 10(-7); Bonferroni), including probes in the recently reported HIF3A, CPT1A and ABCG1 regions. Replication using blood DNA was achieved for 37 BMI probes and 1 additional WC probe. Sixteen of these also replicated in adipose tissue, including 15 novel methylation findings near genes involved in lipid metabolism, immune response/cytokine signaling and other diverse pathways, including LGALS3BP, KDM2B, PBX1 and BBS2, among others. Adiposity traits are associated with DNA methylation at numerous CpG sites that replicate across studies despite variation in tissue type, ethnicity and analytic approaches.
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Affiliation(s)
- Ellen W Demerath
- Division of Epidemiology and Community Health, School of Public Health, University of Minnesota, Minneapolis, MN 55454, USA,
| | - Weihua Guan
- Division of Biostatistics, School of Public Health, University of Minnesota, Minneapolis, MN 55454, USA
| | - Megan L Grove
- Human Genetics Center, School of Public Health, University of Texas Health Sciences Center at Houston, Houston, TX 77030, USA
| | | | - Michael Mendelson
- Population Sciences Branch, National Heart, Lung, and Blood Institute, National Institutes of Health, Bethesda, MD 20824, USA, Framingham Heart Study, Framingham, MA 01702, USA, Department of Cardiology, Boston Children's Hospital, Boston, MA 02215, USA
| | - Yi-Hui Zhou
- Department of Statistics, North Carolina State University, Raleigh, NC 27695, USA
| | - Åsa K Hedman
- Wellcome Trust Centre for Human Genetics, University of Oxford, Oxford, UK, Department of Medical Sciences, Molecular Medicine and Science for Life Laboratory, Uppsala University, Uppsala, Sweden
| | - Johanna K Sandling
- Department of Medical Sciences, Molecular Medicine and Science for Life Laboratory, Uppsala University, Uppsala, Sweden, Wellcome Trust Sanger Institute, Wellcome Trust Genome Campus, Hinxton, UK
| | - Li-An Li
- Human Genome Sequencing Center, Baylor College of Medicine, Houston, TX 77030, USA
| | | | - Degui Zhi
- Department of Biostatistics, School of Public Health, University of Alabama at Birmingham, Birmingham, AL 35294, USA
| | - Panos Deloukas
- Wellcome Trust Sanger Institute, Wellcome Trust Genome Campus, Hinxton, UK, William Harvey Research Institute, Barts and The London School of Medicine and Dentistry, Queen Mary University of London, London, UK, Princess Al-Jawhara Al-Brahim Centre of Excellence in Research of Hereditary Disorders (PACER-HD), King Abdulaziz University, Jeddah 21589, Saudi Arabia
| | - Liming Liang
- Population Sciences Branch, National Heart, Lung, and Blood Institute, National Institutes of Health, Bethesda, MD 20824, USA, Framingham Heart Study, Framingham, MA 01702, USA, Departments of Epidemiology and Biostatistics, School of Public Health, Harvard University, Boston, MA 02115, USA
| | - Chunyu Liu
- Framingham Heart Study, Framingham, MA 01702, USA, Department of Biostatistics, Boston University, Boston, MA 02118, USA
| | - Jan Bressler
- Human Genetics Center, School of Public Health, University of Texas Health Sciences Center at Houston, Houston, TX 77030, USA
| | - Tim D Spector
- Department of Twin Research and Genetic Epidemiology, King's College London, London SE1 7EH, UK
| | - Kari North
- Department of Epidemiology, University of North Carolina at Chapel Hill, Chapel Hill, NC 27514, USA
| | - Yun Li
- Department of Genetics, Department of Biostatistics and Department of Computer Science, University of North Carolina, Chapel Hill, NC 27599, USA
| | - Devin M Absher
- Hudson Alpha Institute for Biotechnology, Huntsville, AL 34806, USA
| | - Daniel Levy
- Population Sciences Branch, National Heart, Lung, and Blood Institute, National Institutes of Health, Bethesda, MD 20824, USA, Framingham Heart Study, Framingham, MA 01702, USA
| | | | - Myriam Fornage
- Human Genetics Center, School of Public Health, University of Texas Health Sciences Center at Houston, Houston, TX 77030, USA, Human Genome Sequencing Center, Baylor College of Medicine, Houston, TX 77030, USA
| | - James S Pankow
- Division of Epidemiology and Community Health, School of Public Health, University of Minnesota, Minneapolis, MN 55454, USA
| | - Eric Boerwinkle
- Human Genetics Center, School of Public Health, University of Texas Health Sciences Center at Houston, Houston, TX 77030, USA, Human Genome Sequencing Center, Baylor College of Medicine, Houston, TX 77030, USA
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Yang SL, Wu C, Xiong ZF, Fang X. Progress on hypoxia-inducible factor-3: Its structure, gene regulation and biological function (Review). Mol Med Rep 2015; 12:2411-6. [PMID: 25936862 DOI: 10.3892/mmr.2015.3689] [Citation(s) in RCA: 92] [Impact Index Per Article: 10.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/17/2014] [Accepted: 03/26/2015] [Indexed: 11/05/2022] Open
Abstract
Hypoxia inducible factors (HIFs) are transcription factors, which are commonly expressed in mammals, including humans. The HIFs consist of hypoxia-regulated α and oxygen-insensitive β subunits, and are key regulators of gene expression during hypoxia in normal and solid tumor tissues. Three members of the HIF family, HIF-1α, HIF-2α, and HIF-3α, are currently known. HIF-3α differs from HIF-1α and HIF-2α in protein structure and regulation of gene expression. For a long time, HIF-3α was considered as a negative mediator of HIF-regulated genes. HIF-3 has a transcriptional regulatory function, which negatively affects gene expression by competing with HIF-1α and HIF-2α in binding to transcriptional elements in target genes during hypoxia. Previously, certain target genes of HIF-3α have been identified, confirming the role of HIF-3α as a transcription factor. In this review, the protein structure, gene regulation and biological function of HIF-3 are discussed based on the literature.
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Affiliation(s)
- Sheng-Li Yang
- Department of General Surgery, Liyuan Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, Hubei 430000, P.R. China
| | - Chao Wu
- Department of General Surgery, Liyuan Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, Hubei 430000, P.R. China
| | - Zhi-Fan Xiong
- Department of Medicine and Division of Digestion Disease, Liyuan Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, Hubei 430077, P.R. China
| | - Xiefan Fang
- Department of Pediatrics, College of Medicine, University of Florida, Gainesville, FL 32610, USA
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23
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Rönn T, Volkov P, Gillberg L, Kokosar M, Perfilyev A, Jacobsen AL, Jørgensen SW, Brøns C, Jansson PA, Eriksson KF, Pedersen O, Hansen T, Groop L, Stener-Victorin E, Vaag A, Nilsson E, Ling C. Impact of age, BMI and HbA1c levels on the genome-wide DNA methylation and mRNA expression patterns in human adipose tissue and identification of epigenetic biomarkers in blood. Hum Mol Genet 2015; 24:3792-813. [PMID: 25861810 DOI: 10.1093/hmg/ddv124] [Citation(s) in RCA: 128] [Impact Index Per Article: 14.2] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/29/2015] [Accepted: 04/07/2015] [Indexed: 01/03/2023] Open
Abstract
Increased age, BMI and HbA1c levels are risk factors for several non-communicable diseases. However, the impact of these factors on the genome-wide DNA methylation pattern in human adipose tissue remains unknown. We analyzed the DNA methylation of ∼480 000 sites in human adipose tissue from 96 males and 94 females and related methylation to age, BMI and HbA1c. We also compared epigenetic signatures in adipose tissue and blood. Age was significantly associated with both altered DNA methylation and expression of 1050 genes (e.g. FHL2, NOX4 and PLG). Interestingly, many reported epigenetic biomarkers of aging in blood, including ELOVL2, FHL2, KLF14 and GLRA1, also showed significant correlations between adipose tissue DNA methylation and age in our study. The most significant association between age and adipose tissue DNA methylation was found upstream of ELOVL2. We identified 2825 genes (e.g. FTO, ITIH5, CCL18, MTCH2, IRS1 and SPP1) where both DNA methylation and expression correlated with BMI. Methylation at previously reported HIF3A sites correlated significantly with BMI in females only. HbA1c (range 28-46 mmol/mol) correlated significantly with the methylation of 711 sites, annotated to, for example, RAB37, TICAM1 and HLA-DPB1. Pathway analyses demonstrated that methylation levels associated with age and BMI are overrepresented among genes involved in cancer, type 2 diabetes and cardiovascular disease. Our results highlight the impact of age, BMI and HbA1c on epigenetic variation of candidate genes for obesity, type 2 diabetes and cancer in human adipose tissue. Importantly, we demonstrate that epigenetic biomarkers in blood can mirror age-related epigenetic signatures in target tissues for metabolic diseases such as adipose tissue.
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Affiliation(s)
- Tina Rönn
- Department of Clinical Sciences, Epigenetics and Diabetes and
| | - Petr Volkov
- Department of Clinical Sciences, Epigenetics and Diabetes and
| | - Linn Gillberg
- Department of Endocrinology, Rigshospitalet, Tagensvej 20, DK-2200 Copenhagen, Denmark, Faculty of Health Sciences, University of Copenhagen, Blegdamsvej 3, DK-2200 Copenhagen, Denmark
| | - Milana Kokosar
- Department of Physiology/Endocrinology, Institute of Neuroscience and Physiology, Sahlgrenska Academy, University of Gothenburg, Medicinaregatan 11, Box 434, 405 30 Gothenburg, Sweden
| | | | - Anna Louisa Jacobsen
- Department of Endocrinology, Rigshospitalet, Tagensvej 20, DK-2200 Copenhagen, Denmark
| | - Sine W Jørgensen
- Department of Endocrinology, Rigshospitalet, Tagensvej 20, DK-2200 Copenhagen, Denmark, Steno Diabetes Center, Niels Steensensvej 2, DK-2820 Gentofte, Denmark
| | - Charlotte Brøns
- Department of Endocrinology, Rigshospitalet, Tagensvej 20, DK-2200 Copenhagen, Denmark
| | - Per-Anders Jansson
- Wallenberg Laboratory, Sahlgrenska University Hospital, Gothenburg, Sweden
| | - Karl-Fredrik Eriksson
- Department of Clinical Sciences, Vascular Diseases, Lund University, 205 02 Malmö, Sweden
| | - Oluf Pedersen
- The Novo Nordisk Foundation Center for Basic Metabolic Research, Section of Metabolic Genetics, University of Copenhagen, Universitetsparken 1, 2100 Copenhagen, Denmark and
| | - Torben Hansen
- The Novo Nordisk Foundation Center for Basic Metabolic Research, Section of Metabolic Genetics, University of Copenhagen, Universitetsparken 1, 2100 Copenhagen, Denmark and
| | - Leif Groop
- Department of Clinical Sciences, Diabetes and Endocrinology, Lund University Diabetes Centre, CRC, 205 02 Malmö, Sweden
| | - Elisabet Stener-Victorin
- Department of Physiology/Endocrinology, Institute of Neuroscience and Physiology, Sahlgrenska Academy, University of Gothenburg, Medicinaregatan 11, Box 434, 405 30 Gothenburg, Sweden, Department of Physiology and Pharmacology, Karolinska Institutet, 171 77 Stockholm, Sweden
| | - Allan Vaag
- Department of Endocrinology, Rigshospitalet, Tagensvej 20, DK-2200 Copenhagen, Denmark, Faculty of Health Sciences, University of Copenhagen, Blegdamsvej 3, DK-2200 Copenhagen, Denmark
| | - Emma Nilsson
- Department of Clinical Sciences, Epigenetics and Diabetes and Department of Endocrinology, Rigshospitalet, Tagensvej 20, DK-2200 Copenhagen, Denmark
| | - Charlotte Ling
- Department of Clinical Sciences, Epigenetics and Diabetes and
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24
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Frey A, Popp S, Post A, Langer S, Lehmann M, Hofmann U, Sirén AL, Hommers L, Schmitt A, Strekalova T, Ertl G, Lesch KP, Frantz S. Experimental heart failure causes depression-like behavior together with differential regulation of inflammatory and structural genes in the brain. Front Behav Neurosci 2014; 8:376. [PMID: 25400562 PMCID: PMC4215623 DOI: 10.3389/fnbeh.2014.00376] [Citation(s) in RCA: 38] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/16/2014] [Accepted: 10/11/2014] [Indexed: 01/09/2023] Open
Abstract
BACKGROUND Depression and anxiety are common and independent outcome predictors in patients with chronic heart failure (CHF). However, it is unclear whether CHF causes depression. Thus, we investigated whether mice develop anxiety- and depression-like behavior after induction of ischemic CHF by myocardial infarction (MI). METHODS AND RESULTS In order to assess depression-like behavior, anhedonia was investigated by repeatedly testing sucrose preference for 8 weeks after coronary artery ligation or sham operation. Mice with large MI and increased left ventricular dimensions on echocardiography (termed CHF mice) showed reduced preference for sucrose, indicating depression-like behavior. 6 weeks after MI, mice were tested for exploratory activity, anxiety-like behavior and cognitive function using the elevated plus maze (EPM), light-dark box (LDB), open field (OF), and object recognition (OR) tests. In the EPM and OF, CHF mice exhibited diminished exploratory behavior and motivation despite similar movement capability. In the OR, CHF mice had reduced preference for novelty and impaired short-term memory. On histology, CHF mice had unaltered overall cerebral morphology. However, analysis of gene expression by RNA-sequencing in prefrontal cortical, hippocampal, and left ventricular tissue revealed changes in genes related to inflammation and cofactors of neuronal signal transduction in CHF mice, with Nr4a1 being dysregulated both in prefrontal cortex and myocardium after MI. CONCLUSIONS After induction of ischemic CHF, mice exhibited anhedonic behavior, decreased exploratory activity and interest in novelty, and cognitive impairment. Thus, ischemic CHF leads to distinct behavioral changes in mice analogous to symptoms observed in humans with CHF and comorbid depression.
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Affiliation(s)
- Anna Frey
- Medical Clinic and Policlinic I, University Hospital of Würzburg Würzburg, Germany ; Comprehensive Heart Failure Center, University Hospital of Würzburg Würzburg, Germany
| | - Sandy Popp
- Comprehensive Heart Failure Center, University Hospital of Würzburg Würzburg, Germany ; Division of Molecular Psychiatry, Department of Psychiatry, Psychosomatics and Psychotherapy, University Hospital of Würzburg Würzburg, Germany
| | - Antonia Post
- Division of Molecular Psychiatry, Department of Psychiatry, Psychosomatics and Psychotherapy, University Hospital of Würzburg Würzburg, Germany
| | - Simon Langer
- Medical Clinic and Policlinic I, University Hospital of Würzburg Würzburg, Germany ; Comprehensive Heart Failure Center, University Hospital of Würzburg Würzburg, Germany
| | - Marc Lehmann
- Medical Clinic and Policlinic I, University Hospital of Würzburg Würzburg, Germany ; Comprehensive Heart Failure Center, University Hospital of Würzburg Würzburg, Germany
| | - Ulrich Hofmann
- Medical Clinic and Policlinic I, University Hospital of Würzburg Würzburg, Germany ; Interdisziplinäres Zentrum für Klinische Forschung, University Hospital of Würzburg Würzburg, Germany
| | - Anna-Leena Sirén
- Department of Neurosurgery, University Hospital of Würzburg Würzburg, Germany
| | - Leif Hommers
- Comprehensive Heart Failure Center, University Hospital of Würzburg Würzburg, Germany ; Division of Molecular Psychiatry, Department of Psychiatry, Psychosomatics and Psychotherapy, University Hospital of Würzburg Würzburg, Germany ; Interdisziplinäres Zentrum für Klinische Forschung, University Hospital of Würzburg Würzburg, Germany
| | - Angelika Schmitt
- Center of Mental Health, Department of Psychiatry, Psychosomatics, and Psychotherapy, University Hospital of Würzburg Würzburg, Germany
| | - Tatyana Strekalova
- Department of Neuroscience, School for Mental Health and Neuroscience, Maastricht University Maastricht, Netherlands
| | - Georg Ertl
- Medical Clinic and Policlinic I, University Hospital of Würzburg Würzburg, Germany ; Comprehensive Heart Failure Center, University Hospital of Würzburg Würzburg, Germany
| | - Klaus-Peter Lesch
- Comprehensive Heart Failure Center, University Hospital of Würzburg Würzburg, Germany ; Division of Molecular Psychiatry, Department of Psychiatry, Psychosomatics and Psychotherapy, University Hospital of Würzburg Würzburg, Germany ; Department of Neuroscience, School for Mental Health and Neuroscience, Maastricht University Maastricht, Netherlands
| | - Stefan Frantz
- Medical Clinic and Policlinic I, University Hospital of Würzburg Würzburg, Germany ; Comprehensive Heart Failure Center, University Hospital of Würzburg Würzburg, Germany
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25
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Dick KJ, Nelson CP, Tsaprouni L, Sandling JK, Aïssi D, Wahl S, Meduri E, Morange PE, Gagnon F, Grallert H, Waldenberger M, Peters A, Erdmann J, Hengstenberg C, Cambien F, Goodall AH, Ouwehand WH, Schunkert H, Thompson JR, Spector TD, Gieger C, Trégouët DA, Deloukas P, Samani NJ. DNA methylation and body-mass index: a genome-wide analysis. Lancet 2014; 383:1990-8. [PMID: 24630777 DOI: 10.1016/s0140-6736(13)62674-4] [Citation(s) in RCA: 562] [Impact Index Per Article: 56.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
Abstract
BACKGROUND Obesity is a major health problem that is determined by interactions between lifestyle and environmental and genetic factors. Although associations between several genetic variants and body-mass index (BMI) have been identified, little is known about epigenetic changes related to BMI. We undertook a genome-wide analysis of methylation at CpG sites in relation to BMI. METHODS 479 individuals of European origin recruited by the Cardiogenics Consortium formed our discovery cohort. We typed their whole-blood DNA with the Infinium HumanMethylation450 array. After quality control, methylation levels were tested for association with BMI. Methylation sites showing an association with BMI at a false discovery rate q value of 0·05 or less were taken forward for replication in a cohort of 339 unrelated white patients of northern European origin from the MARTHA cohort. Sites that remained significant in this primary replication cohort were tested in a second replication cohort of 1789 white patients of European origin from the KORA cohort. We examined whether methylation levels at identified sites also showed an association with BMI in DNA from adipose tissue (n=635) and skin (n=395) obtained from white female individuals participating in the MuTHER study. Finally, we examined the association of methylation at BMI-associated sites with genetic variants and with gene expression. FINDINGS 20 individuals from the discovery cohort were excluded from analyses after quality-control checks, leaving 459 participants. After adjustment for covariates, we identified an association (q value ≤0·05) between methylation at five probes across three different genes and BMI. The associations with three of these probes--cg22891070, cg27146050, and cg16672562, all of which are in intron 1 of HIF3A--were confirmed in both the primary and second replication cohorts. For every 0·1 increase in methylation β value at cg22891070, BMI was 3·6% (95% CI 2·4-4·9) higher in the discovery cohort, 2·7% (1·2-4·2) higher in the primary replication cohort, and 0·8% (0·2-1·4) higher in the second replication cohort. For the MuTHER cohort, methylation at cg22891070 was associated with BMI in adipose tissue (p=1·72 × 10(-5)) but not in skin (p=0·882). We observed a significant inverse correlation (p=0·005) between methylation at cg22891070 and expression of one HIF3A gene-expression probe in adipose tissue. Two single nucleotide polymorphisms--rs8102595 and rs3826795--had independent associations with methylation at cg22891070 in all cohorts. However, these single nucleotide polymorphisms were not significantly associated with BMI. INTERPRETATION Increased BMI in adults of European origin is associated with increased methylation at the HIF3A locus in blood cells and in adipose tissue. Our findings suggest that perturbation of hypoxia inducible transcription factor pathways could have an important role in the response to increased weight in people. FUNDING The European Commission, National Institute for Health Research, British Heart Foundation, and Wellcome Trust.
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Affiliation(s)
- Katherine J Dick
- Department of Cardiovascular Sciences, University of Leicester, Leicester, UK; National Institute for Health Research Leicester Cardiovascular Biomedical Research Unit, Glenfield Hospital, Leicester, UK
| | - Christopher P Nelson
- Department of Cardiovascular Sciences, University of Leicester, Leicester, UK; National Institute for Health Research Leicester Cardiovascular Biomedical Research Unit, Glenfield Hospital, Leicester, UK
| | - Loukia Tsaprouni
- Human Genetics, Wellcome Trust Sanger Institute, Hinxton, UK; ISPAR Institute, University of Bedforshire, Bedford, UK
| | - Johanna K Sandling
- Human Genetics, Wellcome Trust Sanger Institute, Hinxton, UK; Department of Medical Sciences, Molecular Medicine and Science for Life Laboratory, Uppsala University, Uppsala, Sweden
| | - Dylan Aïssi
- Sorbonne Universités, UPMC Univ Paris 06, UMR_S 1166, F-75013, Paris, France; INSERM, UMR_S 1166, F-75013, Paris, France; ICAN Institute for Cardiometabolism And Nutrition, F-75013, Paris, France
| | - Simone Wahl
- German Center for Diabetes Research, Neuherberg, Germany; Research Unit of Molecular Epidemiology, Helmholtz Zentrum München-German Research Center for Environmental Health, Neuherberg, Germany; Institute of Epidemiology II, Helmholtz Zentrum München-German Research Center for Environmental Health, Neuherberg, Germany
| | - Eshwar Meduri
- Human Genetics, Wellcome Trust Sanger Institute, Hinxton, UK
| | | | - France Gagnon
- Division of Epidemiology, Dalla Lana School of Public Health, University of Toronto, Toronto, ON, Canada
| | - Harald Grallert
- German Center for Diabetes Research, Neuherberg, Germany; Research Unit of Molecular Epidemiology, Helmholtz Zentrum München-German Research Center for Environmental Health, Neuherberg, Germany; Institute of Epidemiology II, Helmholtz Zentrum München-German Research Center for Environmental Health, Neuherberg, Germany
| | - Melanie Waldenberger
- Research Unit of Molecular Epidemiology, Helmholtz Zentrum München-German Research Center for Environmental Health, Neuherberg, Germany; Institute of Epidemiology II, Helmholtz Zentrum München-German Research Center for Environmental Health, Neuherberg, Germany
| | - Annette Peters
- Research Unit of Molecular Epidemiology, Helmholtz Zentrum München-German Research Center for Environmental Health, Neuherberg, Germany; Institute of Epidemiology II, Helmholtz Zentrum München-German Research Center for Environmental Health, Neuherberg, Germany; German Centre for Cardiovascular Research, Munich Heart Alliance, Munich, Germany
| | - Jeanette Erdmann
- Institut für Integrative und Experimentelle Genomik, Universität zu Lübeck, Lübeck, Germany; German Centre for Cardiovascular Research, Hamburg/Kiel/Lübeck, Germany
| | - Christian Hengstenberg
- German Centre for Cardiovascular Research, Munich Heart Alliance, Munich, Germany; Deutsches Herzzentrum München, Technische Universität München, Munich, Germany
| | - Francois Cambien
- Sorbonne Universités, UPMC Univ Paris 06, UMR_S 1166, F-75013, Paris, France; INSERM, UMR_S 1166, F-75013, Paris, France; ICAN Institute for Cardiometabolism And Nutrition, F-75013, Paris, France
| | - Alison H Goodall
- Department of Cardiovascular Sciences, University of Leicester, Leicester, UK; National Institute for Health Research Leicester Cardiovascular Biomedical Research Unit, Glenfield Hospital, Leicester, UK
| | - Willem H Ouwehand
- Human Genetics, Wellcome Trust Sanger Institute, Hinxton, UK; Department of Haematology, University of Cambridge, Cambridge, UK; National Health Service Blood and Transplant, Cambridge, UK
| | - Heribert Schunkert
- German Centre for Cardiovascular Research, Munich Heart Alliance, Munich, Germany; Deutsches Herzzentrum München, Technische Universität München, Munich, Germany
| | - John R Thompson
- Department of Health Sciences, University of Leicester, Leicester, UK
| | - Tim D Spector
- Department of Twin Research and Genetic Epidemiology, King's College London, London, UK
| | - Christian Gieger
- Institute of Genetic Epidemiology, Helmholtz Zentrum München-German Research Center for Environmental Health, Neuherberg, Germany
| | - David-Alexandre Trégouët
- Sorbonne Universités, UPMC Univ Paris 06, UMR_S 1166, F-75013, Paris, France; INSERM, UMR_S 1166, F-75013, Paris, France; ICAN Institute for Cardiometabolism And Nutrition, F-75013, Paris, France
| | - Panos Deloukas
- Human Genetics, Wellcome Trust Sanger Institute, Hinxton, UK; William Harvey Research Institute, Barts and The London School of Medicine and Dentistry, Queen Mary University of London, London, UK; Princess Al-Jawhara Al-Brahim Centre of Excellence in Research of Hereditary Disorders, King Abdulaziz University, Jeddah, Saudi Arabia
| | - Nilesh J Samani
- Department of Cardiovascular Sciences, University of Leicester, Leicester, UK; National Institute for Health Research Leicester Cardiovascular Biomedical Research Unit, Glenfield Hospital, Leicester, UK.
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26
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Thomson EM, Vladisavljevic D, Mohottalage S, Kumarathasan P, Vincent R. Mapping acute systemic effects of inhaled particulate matter and ozone: multiorgan gene expression and glucocorticoid activity. Toxicol Sci 2013; 135:169-81. [PMID: 23805001 PMCID: PMC3748763 DOI: 10.1093/toxsci/kft137] [Citation(s) in RCA: 123] [Impact Index Per Article: 11.2] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
Recent epidemiological studies have demonstrated associations between air pollution and adverse effects that extend beyond respiratory and cardiovascular disease, including low birth weight, appendicitis, stroke, and neurological/neurobehavioural outcomes (e.g., neurodegenerative disease, cognitive decline, depression, and suicide). To gain insight into mechanisms underlying such effects, we mapped gene profiles in the lungs, heart, liver, kidney, spleen, cerebral hemisphere, and pituitary of male Fischer-344 rats immediately and 24h after a 4-h exposure by inhalation to particulate matter (0, 5, and 50mg/m3 EHC-93 urban particles) and ozone (0, 0.4, and 0.8 ppm). Pollutant exposure provoked differential expression of genes involved in a number of pathways, including antioxidant response, xenobiotic metabolism, inflammatory signalling, and endothelial dysfunction. The mRNA profiles, while exhibiting some interorgan and pollutant-specific differences, were remarkably similar across organs for a set of genes, including increased expression of redox/glucocorticoid-sensitive genes and decreased expression of inflammatory genes, suggesting a possible hormonal effect. Pollutant exposure increased plasma levels of adrenocorticotropic hormone and the glucocorticoid corticosterone, confirming activation of the hypothalamic-pituitary-adrenal axis, and there was a corresponding increase in markers of glucocorticoid activity. Although effects were transient and presumably represent an adaptive response to acute exposure in these healthy animals, chronic activation and inappropriate regulation of the hypothalamic-pituitary-adrenal axis are associated with adverse neurobehavioral, metabolic, immune, developmental, and cardiovascular effects. The experimental data are consistent with epidemiological associations of air pollutants with extrapulmonary health outcomes and suggest a mechanism through which such health effects may be induced.
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Affiliation(s)
- Errol M Thomson
- Hazard Identification Division, Environmental Health Science and Research Bureau, Health Canada, Ottawa, Ontario K1A 0K9, Canada.
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27
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Bao B, Azmi AS, Ali S, Ahmad A, Li Y, Banerjee S, Kong D, Sarkar FH. The biological kinship of hypoxia with CSC and EMT and their relationship with deregulated expression of miRNAs and tumor aggressiveness. BIOCHIMICA ET BIOPHYSICA ACTA 2012; 1826:272-96. [PMID: 22579961 PMCID: PMC3788359 DOI: 10.1016/j.bbcan.2012.04.008] [Citation(s) in RCA: 103] [Impact Index Per Article: 8.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/20/2012] [Revised: 04/25/2012] [Accepted: 04/28/2012] [Indexed: 12/13/2022]
Abstract
Hypoxia is one of the fundamental biological phenomena that are intricately associated with the development and aggressiveness of a variety of solid tumors. Hypoxia-inducible factors (HIF) function as a master transcription factor, which regulates hypoxia responsive genes and has been recognized to play critical roles in tumor invasion, metastasis, and chemo-radiation resistance, and contributes to increased cell proliferation, survival, angiogenesis and metastasis. Therefore, tumor hypoxia with deregulated expression of HIF and its biological consequence lead to poor prognosis of patients diagnosed with solid tumors, resulting in higher mortality, suggesting that understanding of the molecular relationship of hypoxia with other cellular features of tumor aggressiveness would be invaluable for developing newer targeted therapy for solid tumors. It has been well recognized that cancer stem cells (CSCs) and epithelial-to-mesenchymal transition (EMT) phenotypic cells are associated with therapeutic resistance and contribute to aggressive tumor growth, invasion, metastasis and believed to be the cause of tumor recurrence. Interestingly, hypoxia and HIF signaling pathway are known to play an important role in the regulation and sustenance of CSCs and EMT phenotype. However, the molecular relationship between HIF signaling pathway with the biology of CSCs and EMT remains unclear although NF-κB, PI3K/Akt/mTOR, Notch, Wnt/β-catenin, and Hedgehog signaling pathways have been recognized as important regulators of CSCs and EMT. In this article, we will discuss the state of our knowledge on the role of HIF-hypoxia signaling pathway and its kinship with CSCs and EMT within the tumor microenvironment. We will also discuss the potential role of hypoxia-induced microRNAs (miRNAs) in tumor development and aggressiveness, and finally discuss the potential effects of nutraceuticals on the biology of CSCs and EMT in the context of tumor hypoxia.
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Affiliation(s)
- Bin Bao
- Department of Pathology, Karmanos Cancer Institute, Wayne State University, Detroit, MI, USA
| | - Asfar S. Azmi
- Department of Pathology, Karmanos Cancer Institute, Wayne State University, Detroit, MI, USA
| | - Shadan Ali
- Department of Pathology, Karmanos Cancer Institute, Wayne State University, Detroit, MI, USA
| | - Aamir Ahmad
- Department of Pathology, Karmanos Cancer Institute, Wayne State University, Detroit, MI, USA
| | - Yiwei Li
- Department of Pathology, Karmanos Cancer Institute, Wayne State University, Detroit, MI, USA
| | - Sanjeev Banerjee
- Department of Pathology, Karmanos Cancer Institute, Wayne State University, Detroit, MI, USA
| | - Dejuan Kong
- Department of Pathology, Karmanos Cancer Institute, Wayne State University, Detroit, MI, USA
| | - Fazlul H. Sarkar
- Department of Pathology, Karmanos Cancer Institute, Wayne State University, Detroit, MI, USA
- Department of Oncology, Karmanos Cancer Institute, Wayne State University, Detroit, MI, USA
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Ford KM, Saint-Geniez M, Walshe T, Zahr A, D'Amore PA. Expression and role of VEGF in the adult retinal pigment epithelium. Invest Ophthalmol Vis Sci 2011; 52:9478-87. [PMID: 22058334 DOI: 10.1167/iovs.11-8353] [Citation(s) in RCA: 132] [Impact Index Per Article: 10.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022] Open
Abstract
PURPOSE Despite a lack of active angiogenesis, VEGF is expressed in nearly every adult tissue, and recent evidence suggests that VEGF may serve as a survival factor for both vascular and nonvascular tissues. VEGF blockade is a widely used treatment for neovascular diseases such as wet age-related macular degeneration (AMD). Therefore, it was sought in this study to evaluate the expression and role of endogenous VEGF in RPE. METHODS VEGF and VEGFR2 expression in the murine retina were assessed during development. Bevacizumab was used to neutralize VEGF in ARPE-19 cells, and the effects on cell survival and apical microvill were assessed by TUNEL and SEM, respectively. VEGF was systemically neutralized in vivo by adenoviral-mediated overexpression of soluble VEGFR1 (sFlt). RPE and choriocapillaris were analyzed by transmission electron microscopy (TEM). Changes in gene expression were evaluated by quantitative real-time PCR. RESULTS VEGF expression was detected in the developing RPE as early as embryonic day (E) 9.5, whereas VEGFR2 expression by RPE began nonuniformly between postnatal (P) day 6.5 and P8.5. VEGF neutralization in vitro led to increased apoptosis and reduced microvilli density and length. Systemic VEGF neutralization led to transient degenerative changes; RPE were vacuolated and separated from photoreceptor outer segments, and choriocapillaris fenestrations were decreased. VEGF levels were elevated in RPE of Ad-sFlt1 mice at day 4 postinfection, and there was increased expression of the neurotrophic factor CD59a at day 14. CONCLUSIONS These results indicate that VEGF plays a critical role in survival and maintenance of RPE integrity. Potential undesired off-target effects should be considered with chronic use of anti-VEGF agents.
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Affiliation(s)
- Knatokie M Ford
- Schepens Eye Research Institute/Massachusetts Eye and Ear, Harvard Medical School, Boston, Massachusetts 02114, USA
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Emery M, Schorderet DF, Roduit R. Acute hypoglycemia induces retinal cell death in mouse. PLoS One 2011; 6:e21586. [PMID: 21738719 PMCID: PMC3124528 DOI: 10.1371/journal.pone.0021586] [Citation(s) in RCA: 27] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/22/2010] [Accepted: 06/06/2011] [Indexed: 12/30/2022] Open
Abstract
Background Glucose is the most important metabolic substrate of the retina and maintenance of normoglycemia is an essential challenge for diabetic patients. Glycemic excursions could lead to cardiovascular disease, nephropathy, neuropathy and retinopathy. A vast body of literature exists on hyperglycemia namely in the field of diabetic retinopathy, but very little is known about the deleterious effect of hypoglycemia. Therefore, we decided to study the role of acute hypoglycemia in mouse retina. Methodology/Principal Findings To test effects of hypoglycemia, we performed a 5-hour hyperinsulinemic/hypoglycemic clamp; to exclude an effect of insulin, we made a hyperinsulinemic/euglycemic clamp as control. We then isolated retinas from each group at different time-points after the clamp to analyze cells apoptosis and genes regulation. In parallel, we used 661W photoreceptor cells to confirm in vivo results. We showed herein that hypoglycemia induced retinal cell death in mouse via caspase 3 activation. We then tested the mRNA expression of glutathione transferase omega 1 (Gsto1) and glutathione peroxidase 3 (Gpx3), two genes involved in glutathione (GSH) homeostasis. The expression of both genes was up-regulated by low glucose, leading to a decrease of reduced glutathione (GSH). In vitro experiments confirmed the low-glucose induction of 661W cell death via superoxide production and activation of caspase 3, which was concomitant with a decrease of GSH content. Moreover, decrease of GSH content by inhibition with buthionine sulphoximine (BSO) at high glucose induced apoptosis, while complementation with extracellular glutathione ethyl ester (GSHee) at low glucose restored GSH level and reduced apoptosis. Conclusions/Significance We showed, for the first time, that acute insulin-induced hypoglycemia leads to caspase 3-dependant retinal cell death with a predominant role of GSH content.
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Affiliation(s)
- Martine Emery
- Institute for Research in Ophthalmology (IRO), Sion, Switzerland
- Department of Ophthalmology, University of Lausanne, Lausanne, Switzerland
| | - Daniel F. Schorderet
- Institute for Research in Ophthalmology (IRO), Sion, Switzerland
- Department of Ophthalmology, University of Lausanne, Lausanne, Switzerland
- Ecole Polytechnique Fédérale de Lausanne (EPFL), Lausanne, Switzerland
| | - Raphaël Roduit
- Institute for Research in Ophthalmology (IRO), Sion, Switzerland
- Department of Ophthalmology, University of Lausanne, Lausanne, Switzerland
- * E-mail:
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Kristensen PL, Pedersen-Bjergaard U, Schalkwijk C, Olsen NV, Thorsteinsson B. Erythropoietin and vascular endothelial growth factor as risk markers for severe hypoglycaemia in type 1 diabetes. Eur J Endocrinol 2010; 163:391-8. [PMID: 20566589 DOI: 10.1530/eje-10-0464] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Abstract
OBJECTIVE Circulating erythropoietin (EPO) and vascular endothelial growth factor (VEGF) increase during hypoglycaemia and may represent protective hormonal counter-regulatory responses. We tested the hypothesis that low levels of EPO and VEGF are associated with a higher frequency of severe hypoglycaemia in a cohort of patients with type 1 diabetes. DESIGN Prospective observational follow-up study. METHODS Totally 219 patients with type 1 diabetes (41% females, age 46+/-13 years (mean+/-s.d.), duration of diabetes 21+/-12 years, and HbAlc 8.5+/-1.1%) were followed in a 1-year observational study. Plasma EPO and serum VEGF levels were measured at baseline with ELISA. Events of severe hypoglycaemia defined by third party assistance were recorded and validated in telephone interviews within 24 h. RESULTS Totally 235 episodes of severe hypoglycaemia (1.1 episodes per patient-year) were reported by 82 patients (37%). At baseline, plasma EPO was 8.6 (3.1-34.3) U/l (median (range)), and serum VEGF was 52.2 (6.6-337) pg/ml. The levels of EPO and VEGF were not associated with frequency of severe and mild hypoglycaemia. The levels of EPO were not associated with age, sex, duration of diabetes, body mass index, HbAlc, C-peptide level or hypoglycaemia awareness status. The levels of VEGF were positively associated with age and female sex. CONCLUSIONS Although several studies suggest that VEGF and EPO may affect brain function during hypoglycaemia, this study does not support random VEGF or EPO levels to determine future risk of severe hypoglycaemia in people with type 1 diabetes.
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Affiliation(s)
- P L Kristensen
- Endocrinology Section, Department of Cardiology and Endocrinology, Hillerød Hospital, Dyrehavevej 29, DK-3400 Hillerød, Denmark.
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McIntosh BE, Hogenesch JB, Bradfield CA. Mammalian Per-Arnt-Sim proteins in environmental adaptation. Annu Rev Physiol 2010; 72:625-45. [PMID: 20148691 DOI: 10.1146/annurev-physiol-021909-135922] [Citation(s) in RCA: 265] [Impact Index Per Article: 18.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Abstract
The Per-Arnt-Sim (PAS) domain is conserved across the kingdoms of life and found in an ever-growing list of proteins. This domain can bind to and sense endogenous or xenobiotic small molecules such as molecular oxygen, cellular metabolites, or polyaromatic hydrocarbons. Members of this family are often found in pathways that regulate responses to environmental change; in mammals these include the hypoxia, circadian, and dioxin response pathways. These pathways function in development and throughout life to regulate cellular, organ, and whole-organism adaptive responses. Remarkably, in the case of the clock, this adaptation includes anticipation of environmental change. In this review, we summarize the roles of PAS domain-containing proteins in mammals. We provide structural evidence that functionally classifies both known and unknown biological roles. Finally, we discuss the role of PAS proteins in anticipation of and adaptation to environmental change.
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Affiliation(s)
- Brian E McIntosh
- McArdle Laboratory for Cancer Research, School of Medicine and Public Health, University of Wisconsin, Madison, WI 53706, USA.
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Pringle KG, Kind KL, Sferruzzi-Perri AN, Thompson JG, Roberts CT. Beyond oxygen: complex regulation and activity of hypoxia inducible factors in pregnancy. Hum Reprod Update 2009; 16:415-31. [PMID: 19926662 PMCID: PMC2880912 DOI: 10.1093/humupd/dmp046] [Citation(s) in RCA: 168] [Impact Index Per Article: 11.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022] Open
Abstract
In the first trimester the extravillous cytotrophoblast cells occlude the uterine spiral arterioles creating a low oxygen environment early in pregnancy, which is essential for pregnancy success. Paradoxically, shallow trophoblast invasion and defective vascular remodelling of the uterine spiral arteries in the first trimester may result in impaired placental perfusion and chronic placental ischemia and hypoxia later in gestation leading to adverse pregnancy outcomes. The hypoxia inducible factors (HIFs) are key mediators of the response to low oxygen. We aimed to elucidate mechanisms of regulation of HIFs and the role these may play in the control of placental differentiation, growth and function in both normal and pathological pregnancies. The Pubmed database was consulted for identification of the most relevant published articles. Search terms used were oxygen, placenta, trophoblast, pregnancy, HIF and hypoxia. The HIFs are able to function throughout all aspects of normal and abnormal placental differentiation, growth and function; during the first trimester (physiologically low oxygen), during mid-late gestation (where there is adequate supply of blood and oxygen to the placenta) and in pathological pregnancies complicated by placental hypoxia/ischemia. During normal pregnancy HIFs may respond to complex alterations in oxygen, hormones, cytokines and growth factors to regulate placental invasion, differentiation, transport and vascularization. In the ever-changing environment created during pregnancy, the HIFs appear to act as key mediators of placental development and function and thereby are likely to be important contributors to both normal and adverse pregnancy outcomes.
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Affiliation(s)
- K G Pringle
- Research Centre for Reproductive Health, Discipline of Obstetrics and Gynaecology, University of Adelaide, Adelaide, SA 5005, Australia
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Hatanaka M, Shimba S, Sakaue M, Kondo Y, Kagechika H, Kokame K, Miyata T, Hara S. Hypoxia-inducible factor-3alpha functions as an accelerator of 3T3-L1 adipose differentiation. Biol Pharm Bull 2009; 32:1166-72. [PMID: 19571379 DOI: 10.1248/bpb.32.1166] [Citation(s) in RCA: 37] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
Hypoxia-inducible factor (HIF) is a heterodimer composed of HIF-alpha and -beta, and to date, three HIF-alpha subunits, HIF-1alpha, -2alpha, and -3alpha, have been identified. Among these HIF-alpha subunits, HIF-1alpha represses peroxisome proliferator activator gamma2 gene expression and then inhibits adipogenesis, and HIF-2alpha is induced during adipose differentiation and functions as a positive regulator of adipogenesis. We here found that like HIF-2alpha, HIF-3alpha was induced during 3T3-L1 adipose differentiation. Reporter gene analysis revealed that HIF-2alpha enhanced the promoter activity of the 5'-flanking region of the mouse HIF-3alpha gene (nucleotides -2710 to +56), while HIF-1alpha had no substantial effects on the promoter activity. These results suggested that HIF-2alpha, which was induced during adipogenesis, might regulate the HIF-3alpha gene expression. Furthermore, the 5'-deletion analysis revealed that the sequence between -251 and -228 in mouse HIF-3alpha promoter was essential in response to HIF-2alpha. We further examined the effect of ectopic expression of HIF-3alpha in 3T3-L1 cells on adipose differentiation and found that ectopic expression of HIF-3alpha at the early stage of differentiation induced the expression of several kinds of adipocytes-related genes and enhanced adipogenic potential. HIF-3alpha, which is induced by HIF-2alpha, might function as an accelerator of adipogenesis.
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Affiliation(s)
- Misaki Hatanaka
- Department of Public Health and Molecular Toxicology, School of Pharmaceutical Sciences, Kitasato University
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Regulatory role of HIF-1alpha in the pathogenesis of age-related macular degeneration (AMD). Ageing Res Rev 2009; 8:349-58. [PMID: 19589398 DOI: 10.1016/j.arr.2009.06.002] [Citation(s) in RCA: 110] [Impact Index Per Article: 7.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/29/2009] [Revised: 06/26/2009] [Accepted: 06/29/2009] [Indexed: 01/10/2023]
Abstract
Age-related macular degeneration (AMD) is a leading cause of irreversible blindness in the elderly throughout the world. AMD is attributed to a complex interaction of genetic and environmental factors. It is characterized by degeneration involving the retinal photoreceptors, retinal pigment epithelium (RPE), and Bruch's membrane, as well as alterations in choroidal capillaries. Aging and age-associated degenerative diseases, such as AMD, are intimately associated with decreased levels of tissue oxygenation and hypoxia that may induce accumulation of detrimental RPE-associated deposits, inflammation and neovascularization processes in retina. Hypoxia-inducible factor (HIF) is the master regulator for hypoxia-induced cellular adaptation that is involved in NF-kappaB signaling and the autophagic protein clearance system. In this review, we discuss role of HIF in AMD pathology and as a possible therapeutic target.
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Karakelides H, Asmann YW, Bigelow ML, Short KR, Dhatariya K, Coenen-Schimke J, Kahl J, Mukhopadhyay D, Nair KS. Effect of insulin deprivation on muscle mitochondrial ATP production and gene transcript levels in type 1 diabetic subjects. Diabetes 2007; 56:2683-9. [PMID: 17660267 DOI: 10.2337/db07-0378] [Citation(s) in RCA: 88] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
Abstract
OBJECTIVE Muscle mitochondrial dysfunction occurs in many insulin-resistant states, such as type 2 diabetes, prompting a hypothesis that mitochondrial dysfunction may cause insulin resistance. We determined the impact of insulin deficiency on muscle mitochondrial ATP production by temporarily depriving type 1 diabetic patients of insulin treatment. RESEARCH DESIGN AND METHODS We withdrew insulin for 8.6 +/- 0.6 h in nine C-peptide-negative type 1 diabetic subjects and measured muscle mitochondrial ATP production and gene transcript levels (gene array and real-time quantitative PCR) and compared with insulin-treated state. We also measured oxygen consumption (indirect calorimetry); plasma levels of glucagon, bicarbonate, and other substrates; and urinary nitrogen. RESULTS Withdrawal of insulin resulted in increased plasma glucose, branched chain amino acids, nonesterified fatty acids, beta-hydroxybutyrate, and urinary nitrogen but no change in bicarbonate. Insulin deprivation decreased muscle mitochondrial ATP production rate (MAPR) despite an increase in whole-body oxygen consumption and altered expression of many muscle mitochondrial gene transcripts. Transcript levels of genes involved in oxidative phosphorylation were decreased, whereas those involved in vascular endothelial growth factor (VEGF) signaling, inflammation, cytoskeleton signaling, and integrin signaling pathways were increased. CONCLUSIONS Insulin deficiency and associated metabolic changes reduce muscle MAPR and expression of oxidative phosphorylation genes in type 1 diabetes despite an increase in whole-body oxygen consumption. Increase in transcript levels of genes involved in VEGF, inflammation, cytoskeleton, and integrin signaling pathways suggest that vascular factors and cell proliferation that may interact with mitochondrial changes occurred.
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Affiliation(s)
- Helen Karakelides
- Division of Endocrinology and Metabolism and Endocrine Research Unit, Mayo Clinic, 200 First St. SW, Joseph 5-194, Rochester, MN 55905, USA
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