1
|
Chatham JC, Patel RP. Protein glycosylation in cardiovascular health and disease. Nat Rev Cardiol 2024; 21:525-544. [PMID: 38499867 DOI: 10.1038/s41569-024-00998-z] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Accepted: 02/13/2024] [Indexed: 03/20/2024]
Abstract
Protein glycosylation, which involves the attachment of carbohydrates to proteins, is one of the most abundant protein co-translational and post-translational modifications. Advances in technology have substantially increased our knowledge of the biosynthetic pathways involved in protein glycosylation, as well as how changes in glycosylation can affect cell function. In addition, our understanding of the role of protein glycosylation in disease processes is growing, particularly in the context of immune system function, infectious diseases, neurodegeneration and cancer. Several decades ago, cell surface glycoproteins were found to have an important role in regulating ion transport across the cardiac sarcolemma. However, with very few exceptions, our understanding of how changes in protein glycosylation influence cardiovascular (patho)physiology remains remarkably limited. Therefore, in this Review, we aim to provide an overview of N-linked and O-linked protein glycosylation, including intracellular O-linked N-acetylglucosamine protein modification. We discuss our current understanding of how all forms of protein glycosylation contribute to normal cardiovascular function and their roles in cardiovascular disease. Finally, we highlight potential gaps in our knowledge about the effects of protein glycosylation on the heart and vascular system, highlighting areas for future research.
Collapse
Affiliation(s)
- John C Chatham
- Division of Molecular and Cellular Pathology, Department of Pathology, University of Alabama at Birmingham, Birmingham, AL, USA.
| | - Rakesh P Patel
- Division of Molecular and Cellular Pathology, Department of Pathology, University of Alabama at Birmingham, Birmingham, AL, USA
| |
Collapse
|
2
|
Umapathi P, Aggarwal A, Zahra F, Narayanan B, Zachara NE. The multifaceted role of intracellular glycosylation in cytoprotection and heart disease. J Biol Chem 2024; 300:107296. [PMID: 38641064 PMCID: PMC11126959 DOI: 10.1016/j.jbc.2024.107296] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/23/2023] [Revised: 04/09/2024] [Accepted: 04/11/2024] [Indexed: 04/21/2024] Open
Abstract
The modification of nuclear, cytoplasmic, and mitochondrial proteins by O-linked β-N-actylglucosamine (O-GlcNAc) is an essential posttranslational modification that is common in metozoans. O-GlcNAc is cycled on and off proteins in response to environmental and physiological stimuli impacting protein function, which, in turn, tunes pathways that include transcription, translation, proteostasis, signal transduction, and metabolism. One class of stimulus that induces rapid and dynamic changes to O-GlcNAc is cellular injury, resulting from environmental stress (for instance, heat shock), hypoxia/reoxygenation injury, ischemia reperfusion injury (heart attack, stroke, trauma hemorrhage), and sepsis. Acute elevation of O-GlcNAc before or after injury reduces apoptosis and necrosis, suggesting that injury-induced changes in O-GlcNAcylation regulate cell fate decisions. However, prolonged elevation or reduction in O-GlcNAc leads to a maladaptive response and is associated with pathologies such as hypertrophy and heart failure. In this review, we discuss the impact of O-GlcNAc in both acute and prolonged models of injury with a focus on the heart and biological mechanisms that underpin cell survival.
Collapse
Affiliation(s)
- Priya Umapathi
- Division of Cardiology, Department of Medicine, The Johns Hopkins University School of Medicine, Baltimore, Maryland, USA.
| | - Akanksha Aggarwal
- Department of Biological Chemistry, The Johns Hopkins University School of Medicine, Baltimore, Maryland, USA
| | - Fiddia Zahra
- Department of Biological Chemistry, The Johns Hopkins University School of Medicine, Baltimore, Maryland, USA
| | - Bhargavi Narayanan
- Department of Biological Chemistry, The Johns Hopkins University School of Medicine, Baltimore, Maryland, USA
| | - Natasha E Zachara
- Department of Biological Chemistry, The Johns Hopkins University School of Medicine, Baltimore, Maryland, USA; Department of Oncology, The Johns Hopkins University School of Medicine, Baltimore, Maryland, USA.
| |
Collapse
|
3
|
Qiu Z, Cui J, Huang Q, Qi B, Xia Z. Roles of O-GlcNAcylation in Mitochondrial Homeostasis and Cardiovascular Diseases. Antioxidants (Basel) 2024; 13:571. [PMID: 38790676 PMCID: PMC11117601 DOI: 10.3390/antiox13050571] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/25/2024] [Revised: 04/28/2024] [Accepted: 05/04/2024] [Indexed: 05/26/2024] Open
Abstract
Protein posttranslational modifications are important factors that mediate the fine regulation of signaling molecules. O-linked β-N-acetylglucosamine-modification (O-GlcNAcylation) is a monosaccharide modification on N-acetylglucosamine linked to the hydroxyl terminus of serine and threonine of proteins. O-GlcNAcylation is responsive to cellular stress as a reversible and posttranslational modification of nuclear, mitochondrial and cytoplasmic proteins. Mitochondrial proteins are the main targets of O-GlcNAcylation and O-GlcNAcylation is a key regulator of mitochondrial homeostasis by directly regulating the mitochondrial proteome or protein activity and function. Disruption of O-GlcNAcylation is closely related to mitochondrial dysfunction. More importantly, the O-GlcNAcylation of cardiac proteins has been proven to be protective or harmful to cardiac function. Mitochondrial homeostasis is crucial for cardiac contractile function and myocardial cell metabolism, and the imbalance of mitochondrial homeostasis plays a crucial role in the pathogenesis of cardiovascular diseases (CVDs). In this review, we will focus on the interactions between protein O-GlcNAcylation and mitochondrial homeostasis and provide insights on the role of mitochondrial protein O-GlcNAcylation in CVDs.
Collapse
Affiliation(s)
- Zhen Qiu
- Department of Anesthesiology, Renmin Hospital of Wuhan University, Wuhan 430060, China; (Z.Q.); (J.C.); (Q.H.)
| | - Jiahui Cui
- Department of Anesthesiology, Renmin Hospital of Wuhan University, Wuhan 430060, China; (Z.Q.); (J.C.); (Q.H.)
| | - Qin Huang
- Department of Anesthesiology, Renmin Hospital of Wuhan University, Wuhan 430060, China; (Z.Q.); (J.C.); (Q.H.)
| | - Biao Qi
- Department of Anesthesiology, Hubei 672 Orthopaedics Hospital of Integrated Chinese and Western Medicine, Wuhan Orthopaedics Hospital of Intergrated Traditional Medicine Chinese and Western Medicine, The Affiliated Hospital of Wuhan Sports University, Wuhan 430070, China
| | - Zhongyuan Xia
- Department of Anesthesiology, Renmin Hospital of Wuhan University, Wuhan 430060, China; (Z.Q.); (J.C.); (Q.H.)
| |
Collapse
|
4
|
Xue Q, Ji S, Xu H, Yu S. O-GlcNAcylation: a pro-survival response to acute stress in the cardiovascular and central nervous systems. Eur J Med Res 2024; 29:174. [PMID: 38491477 PMCID: PMC10943874 DOI: 10.1186/s40001-024-01773-z] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/19/2023] [Accepted: 03/06/2024] [Indexed: 03/18/2024] Open
Abstract
O-GlcNAcylation is a unique monosaccharide modification that is ubiquitously present in numerous nucleoplasmic and mitochondrial proteins. The hexosamine biosynthesis pathway (HBP), which is a key branch of glycolysis, provides the unique sugar donor UDP-GlcNAc for the O-GlcNAc modification. Thus, HBP/O-GlcNAcylation can act as a nutrient sensor to perceive changes in nutrient levels and trigger O-GlcNAc modifications of functional proteins in cellular (patho-)physiology, thereby regulating diverse metabolic processes. An imbalance in O-GlcNAcylation has been shown to be a pathogenic contributor to dysfunction in metabolic diseases, including type 2 diabetes, cancer, and neurodegeneration. However, under acute stress conditions, protein O-GlcNAc modification exhibits rapid and transient upregulation, which is strongly correlated with stress tolerance and cell survival. In this context, we discuss the metabolic, pharmacological and genetic modulation of HBP/O-GlcNAc modification in the biological system, the beneficial role of O-GlcNAcylation in regulating stress tolerance for cardioprotection, and neuroprotection, which is a novel and rapidly growing field. Current evidence suggests that transient activation of the O-GlcNAc modification represents a potent pro-survival signalling pathway and may provide a promising strategy for stress-related disorder therapy.
Collapse
Affiliation(s)
- Qiu Xue
- Key Laboratory of Neuroregeneration of Jiangsu and Ministry of Education, Co-Innovation Center of Neuroregeneration, NMPA Key Laboratory for Research and Evaluation of Tissue Engineering Technology Products, Nantong University, 19 Qixiu Road, Nantong, 226001, China
- Department of General Surgery, Nantong Tumor Hospital, Nantong Fifth People's Hospital, Affiliated Tumor Hospital of Nantong University, 30 Tongyang North Road, Nantong, 226361, China
| | - Shengtao Ji
- Key Laboratory of Neuroregeneration of Jiangsu and Ministry of Education, Co-Innovation Center of Neuroregeneration, NMPA Key Laboratory for Research and Evaluation of Tissue Engineering Technology Products, Nantong University, 19 Qixiu Road, Nantong, 226001, China
- Department of Neurology, Affiliated Hospital of Nantong University, Medical School of Nantong University, 20 Xisi Road, Nantong, 226001, China
| | - Hui Xu
- Key Laboratory of Neuroregeneration of Jiangsu and Ministry of Education, Co-Innovation Center of Neuroregeneration, NMPA Key Laboratory for Research and Evaluation of Tissue Engineering Technology Products, Nantong University, 19 Qixiu Road, Nantong, 226001, China
- Nantong Institute of Genetics and Reproductive Medicine, Affiliated Maternity & Child Healthcare Hospital of Nantong University, 399 Century Avenue, Nantong, 226001, China
| | - Shu Yu
- Key Laboratory of Neuroregeneration of Jiangsu and Ministry of Education, Co-Innovation Center of Neuroregeneration, NMPA Key Laboratory for Research and Evaluation of Tissue Engineering Technology Products, Nantong University, 19 Qixiu Road, Nantong, 226001, China.
| |
Collapse
|
5
|
Costa TJ, Wilson EW, Fontes MT, Pernomian L, Tostes RC, Wenceslau CF, McCarthy CG. The O-GlcNAc dichotomy: when does adaptation become pathological? Clin Sci (Lond) 2023; 137:1683-1697. [PMID: 37986614 DOI: 10.1042/cs20220309] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/13/2023] [Revised: 10/31/2023] [Accepted: 11/02/2023] [Indexed: 11/22/2023]
Abstract
O-Linked attachment of β-N-acetylglucosamine (O-GlcNAc) on serine and threonine residues of nuclear, cytoplasmic, and mitochondrial proteins is a highly dynamic and ubiquitous post-translational modification that impacts the function, activity, subcellular localization, and stability of target proteins. Physiologically, acute O-GlcNAcylation serves primarily to modulate cellular signaling and transcription regulatory pathways in response to nutrients and stress. To date, thousands of proteins have been revealed to be O-GlcNAcylated and this number continues to grow as the technology for the detection of O-GlcNAc improves. The attachment of a single O-GlcNAc is catalyzed by the enzyme O-GlcNAc transferase (OGT), and their removal is catalyzed by O-GlcNAcase (OGA). O-GlcNAcylation is regulated by the metabolism of glucose via the hexosamine biosynthesis pathway, and the metabolic abnormalities associated with pathophysiological conditions are all associated with increased flux through this pathway and elevate O-GlcNAc levels. While chronic O-GlcNAcylation is well associated with cardiovascular dysfunction, only until recently, and with genetically modified animals, has O-GlcNAcylation as a contributing mechanism of cardiovascular disease emerged. This review will address and critically evaluate the current literature on the role of O-GlcNAcylation in vascular physiology, with a view that this pathway can offer novel targets for the treatment and prevention of cardiovascular diseases.
Collapse
Affiliation(s)
- Tiago J Costa
- Cardiovascular Translational Research Center, University of South Carolina School of Medicine-Columbia, SC, U.S.A
- Department of Cell Biology and Anatomy, University of South Carolina School of Medicine-Columbia, SC, U.S.A
- Biomedical Engineering Program, College of Engineering and Computing, University of South Carolina, Columbia, SC, U.S.A
| | - Emily W Wilson
- Cardiovascular Translational Research Center, University of South Carolina School of Medicine-Columbia, SC, U.S.A
- Department of Cell Biology and Anatomy, University of South Carolina School of Medicine-Columbia, SC, U.S.A
| | - Milene T Fontes
- Cardiovascular Translational Research Center, University of South Carolina School of Medicine-Columbia, SC, U.S.A
- Department of Cell Biology and Anatomy, University of South Carolina School of Medicine-Columbia, SC, U.S.A
- Biomedical Engineering Program, College of Engineering and Computing, University of South Carolina, Columbia, SC, U.S.A
| | - Laena Pernomian
- Cardiovascular Translational Research Center, University of South Carolina School of Medicine-Columbia, SC, U.S.A
- Department of Cell Biology and Anatomy, University of South Carolina School of Medicine-Columbia, SC, U.S.A
- Biomedical Engineering Program, College of Engineering and Computing, University of South Carolina, Columbia, SC, U.S.A
| | - Rita C Tostes
- Department of Pharmacology, Ribeirao Preto Medical School, University of Sao Paulo, Ribeirao Preto, SP, Brazil
| | - Camilla F Wenceslau
- Cardiovascular Translational Research Center, University of South Carolina School of Medicine-Columbia, SC, U.S.A
- Department of Cell Biology and Anatomy, University of South Carolina School of Medicine-Columbia, SC, U.S.A
- Biomedical Engineering Program, College of Engineering and Computing, University of South Carolina, Columbia, SC, U.S.A
| | - Cameron G McCarthy
- Cardiovascular Translational Research Center, University of South Carolina School of Medicine-Columbia, SC, U.S.A
- Department of Cell Biology and Anatomy, University of South Carolina School of Medicine-Columbia, SC, U.S.A
- Biomedical Engineering Program, College of Engineering and Computing, University of South Carolina, Columbia, SC, U.S.A
| |
Collapse
|
6
|
Gutiérrez A, Gómez Del Val A, Contreras C, Olmos L, Sánchez A, Prieto D. Calcium handling coupled to the endothelin ET A and ET B receptor-mediated vasoconstriction in resistance arteries: Differential regulation by PI3K, PKC and RhoK. Eur J Pharmacol 2023; 956:175948. [PMID: 37541372 DOI: 10.1016/j.ejphar.2023.175948] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/31/2023] [Revised: 07/14/2023] [Accepted: 08/01/2023] [Indexed: 08/06/2023]
Abstract
Abnormal endothelin-1 (ET-1) activity is involved in the pathogenesis of vascular diseases such as essential and pulmonary arterial hypertension, coronary artery disease, and cerebrovascular disease, blockade of ET receptors having shown efficacy in clinical assays and experimental models of hypertension. Augmented Ca2+ influx and changes in Ca2+ sensitization associated with arterial vasoconstriction underlie increased systemic vascular resistance in hypertension. Since peripheral resistance arteries play a key role in blood pressure regulation, we aimed to determine here the specific Ca2+ signaling mechanisms linked to the ET receptor-mediated vasoconstriction in resistance arteries and their selective regulation by protein kinase C (PKC), Rho kinase (RhoK), the phosphatidylinositol 3-kinase (PI3K) and the mitogen-activated protein kinase (MAPK). ET-1-induced contraction was mediated by the endothelin ETA receptor with a minor contribution of vascular smooth muscle (VSM) endothelin ETB receptors. ET receptor activation elicited Ca2+ mobilization from intracellular stores, extracellular Ca2+ influx and Ca2+ sensitization associated with contraction in resistance arteries. Vasoconstriction induced by ET-1 was largely dependent on activation of canonical transient receptor potential channel 3 (TRPC3) and extracellular Ca2+ influx through nifedipine-sensitive voltage-dependent Ca2+ channels. PI3K inhibition reduced intracellular Ca2+ mobilization and Ca2+ entry without altering vasoconstriction elicited by ET-1, while PKC has dual opposite actions by enhancing Ca2+ influx associated with contraction, and by inhibiting Ca2+ release from intracellular stores. RhoK was a major determinant of the enhanced sensitivity of the contractile filaments underlying ET-1 vasoconstriction, with also a modulatory positive action on Ca2+ influx and intracellular Ca2+ release. Augmented RhoK and PKC activities are involved in vascular dysfunction in hypertension and vascular complications of insulin-resistant states, and these kinases are thus potential pharmacological targets in vascular diseases in which the ET pathway is impaired.
Collapse
Affiliation(s)
- Alejandro Gutiérrez
- Departamento de Fisiología, Facultad de Farmacia, Universidad Complutense de Madrid, 28040, Madrid, Spain
| | - Alfonso Gómez Del Val
- Departamento de Fisiología, Facultad de Farmacia, Universidad Complutense de Madrid, 28040, Madrid, Spain
| | - Cristina Contreras
- Departamento de Fisiología, Facultad de Farmacia, Universidad Complutense de Madrid, 28040, Madrid, Spain
| | - Lucia Olmos
- Departamento de Fisiología, Facultad de Farmacia, Universidad Complutense de Madrid, 28040, Madrid, Spain
| | - Ana Sánchez
- Departamento de Fisiología, Facultad de Farmacia, Universidad Complutense de Madrid, 28040, Madrid, Spain
| | - Dolores Prieto
- Departamento de Fisiología, Facultad de Farmacia, Universidad Complutense de Madrid, 28040, Madrid, Spain.
| |
Collapse
|
7
|
de Lima Castro M, Dos Passos RR, Justina VD, do Amaral WN, Giachini FR. Physiological and pathological evidence of O-GlcNAcylation regulation during pregnancy related process. Placenta 2023; 141:43-50. [PMID: 37210277 DOI: 10.1016/j.placenta.2023.04.018] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/23/2023] [Revised: 03/22/2023] [Accepted: 04/25/2023] [Indexed: 05/22/2023]
Abstract
O-GlcNAcylation is a dynamic and reversible post-translational modification (PTM) controlled by the enzymes O-GlcNAc transferase (OGT) and O-GlcNAcase (OGA). Changes in its expression lead to a breakdown in cellular homeostasis, which is linked to several pathological processes. Placentation and embryonic development are periods of high cell activity, and imbalances in cell signaling pathways can result in infertility, miscarriage, or pregnancy complications. O-GlcNAcylation is involved in cellular processes such as genome maintenance, epigenetic regulation, protein synthesis/degradation, metabolic pathways, signaling pathways, apoptosis, and stress response. Trophoblastic differentiation/invasion and placental vasculogenesis, as well as zygote viability and embryonic neuronal development, are all dependent on O-GlcNAcylation. This PTM is required for pluripotency, which is a required condition for embryonic development. Further, this pathway is a nutritional sensor and cell stress marker, which is primarily measured by the OGT enzyme and its product, protein O-GlcNAcylation. Yet, this post-translational modification is enrolled in metabolic and cardiovascular adaptations during pregnancy. Finally, evidence of how O-GlcNAc impacts pregnancy during pathological conditions such as hyperglycemia, gestational diabetes, hypertension, and stress disorders are reviewed. Considering this scenario, progress in understanding the role of O- GlcNAcylation in pregnancy is required.
Collapse
Affiliation(s)
- Marta de Lima Castro
- Graduation Program in Health Sciences, Faculty of Medicine, Federal University of Goias, Goiânia, Brazil
| | - Rinaldo Rodrigues Dos Passos
- Institute of Biological Sciences, Federal University of Goias, Goiânia, Brazil; Institute of Biological and Health Sciences, Federal University of Mato Grosso, Barra do Garças, Brazil
| | - Vanessa Dela Justina
- Institute of Biological Sciences, Federal University of Goias, Goiânia, Brazil; Institute of Biological and Health Sciences, Federal University of Mato Grosso, Barra do Garças, Brazil
| | - Waldemar Naves do Amaral
- Graduation Program in Health Sciences, Faculty of Medicine, Federal University of Goias, Goiânia, Brazil
| | - Fernanda Regina Giachini
- Institute of Biological Sciences, Federal University of Goias, Goiânia, Brazil; Institute of Biological and Health Sciences, Federal University of Mato Grosso, Barra do Garças, Brazil.
| |
Collapse
|
8
|
Wang HF, Wang YX, Zhou YP, Wei YP, Yan Y, Zhang ZJ, Jing ZC. Protein O-GlcNAcylation in cardiovascular diseases. Acta Pharmacol Sin 2023; 44:8-18. [PMID: 35817809 PMCID: PMC9813366 DOI: 10.1038/s41401-022-00934-2] [Citation(s) in RCA: 10] [Impact Index Per Article: 10.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/07/2022] [Accepted: 05/30/2022] [Indexed: 01/18/2023] Open
Abstract
O-GlcNAcylation is a post-translational modification of protein in response to genetic variations or environmental factors, which is controlled by two highly conserved enzymes, i.e. O-GlcNAc transferase (OGT) and protein O-GlcNAcase (OGA). Protein O-GlcNAcylation mainly occurs in the cytoplasm, nucleus, and mitochondrion, and it is ubiquitously implicated in the development of cardiovascular disease (CVD). Alterations of O-GlcNAcylation could cause massive metabolic imbalance and affect cardiovascular function, but the role of O-GlcNAcylation in CVD remains controversial. That is, acutely increased O-GlcNAcylation is an adaptive heart response, which temporarily protects cardiac function. While it is harmful to cardiomyocytes if O-GlcNAcylation levels remain high in chronic conditions or in the long run. The underlying mechanisms include regulation of transcription, energy metabolism, and other signal transduction reactions induced by O-GlcNAcylation. In this review, we will focus on the interactions between protein O-GlcNAcylation and CVD, and discuss the potential molecular mechanisms that may be able to pave a new avenue for the treatment of cardiovascular events.
Collapse
Affiliation(s)
- Hui-Fang Wang
- Department of Medical Laboratory, Weifang Medical University, Weifang, 261053, China
| | - Yi-Xuan Wang
- Department of Medical Laboratory, Weifang Medical University, Weifang, 261053, China
| | - Yu-Ping Zhou
- Department of Cardiology, State Key Laboratory of Complex Severe and Rare Diseases, Peking Union Medical College Hospital, Chinese Academy of Medical Sciences and Peking Union Medical College, Beijing, 100730, China
| | - Yun-Peng Wei
- Department of Cardiology, State Key Laboratory of Complex Severe and Rare Diseases, Peking Union Medical College Hospital, Chinese Academy of Medical Sciences and Peking Union Medical College, Beijing, 100730, China
| | - Yi Yan
- Institute for Cardiovascular Prevention (IPEK), Ludwig-Maximilians-University Munich, Munich, Germany
- DZHK (German Centre for Cardiovascular Research), Partner Site Munich Heart Alliance, Munich, Germany
| | - Ze-Jian Zhang
- Medical Research Center, State Key Laboratory of Complex Severe and Rare Diseases, Peking Union Medical College Hospital, Chinese Academy of Medical Sciences and Peking Union Medical College, Beijing, 100730, China.
| | - Zhi-Cheng Jing
- Department of Cardiology, State Key Laboratory of Complex Severe and Rare Diseases, Peking Union Medical College Hospital, Chinese Academy of Medical Sciences and Peking Union Medical College, Beijing, 100730, China.
| |
Collapse
|
9
|
Dupas T, Betus C, Blangy-Letheule A, Pelé T, Persello A, Denis M, Lauzier B. An overview of tools to decipher O-GlcNAcylation from historical approaches to new insights. Int J Biochem Cell Biol 2022; 151:106289. [PMID: 36031106 DOI: 10.1016/j.biocel.2022.106289] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/15/2022] [Revised: 08/21/2022] [Accepted: 08/23/2022] [Indexed: 11/19/2022]
Abstract
O-GlcNAcylation is a post-translational modification which affects approximately 5000 human proteins. Its involvement has been shown in many if not all biological processes. Variations in O-GlcNAcylation levels can be associated with the development of diseases. Deciphering the role of O-GlcNAcylation is an important issue to (i) understand its involvement in pathophysiological development and (ii) develop new therapeutic strategies to modulate O-GlcNAc levels. Over the past 30 years, despite the development of several approaches, knowledge of its role and regulation have remained limited. This review proposes an overview of the currently available tools to study O-GlcNAcylation and identify O-GlcNAcylated proteins. Briefly, we discuss pharmacological modulators, methods to study O-GlcNAcylation levels and approaches for O-GlcNAcylomic profiling. This review aims to contribute to a better understanding of the methods used to study O-GlcNAcylation and to promote efforts in the development of new strategies to explore this promising modification.
Collapse
Affiliation(s)
- Thomas Dupas
- Nantes Université, CHU Nantes, CNRS, INSERM, l'institut du thorax, F-44000 Nantes, France.
| | - Charlotte Betus
- Nantes Université, CHU Nantes, CNRS, INSERM, l'institut du thorax, F-44000 Nantes, France; Department of Pharmacology and Physiology, University of Montreal, Montreal, QC H3T 1C5, Canada; CHU Sainte-Justine Research Center, Montreal, QC H3T 1C5, Canada
| | | | - Thomas Pelé
- Nantes Université, CHU Nantes, CNRS, INSERM, l'institut du thorax, F-44000 Nantes, France
| | - Antoine Persello
- Nantes Université, CHU Nantes, CNRS, INSERM, l'institut du thorax, F-44000 Nantes, France
| | - Manon Denis
- Nantes Université, CHU Nantes, CNRS, INSERM, l'institut du thorax, F-44000 Nantes, France; Department of Pharmacology and Physiology, University of Montreal, Montreal, QC H3T 1C5, Canada; CHU Sainte-Justine Research Center, Montreal, QC H3T 1C5, Canada
| | - Benjamin Lauzier
- Nantes Université, CHU Nantes, CNRS, INSERM, l'institut du thorax, F-44000 Nantes, France
| |
Collapse
|
10
|
Xue Q, Yan R, Ji S, Yu S. Regulation of mitochondrial network homeostasis by O-GlcNAcylation. Mitochondrion 2022; 65:45-55. [DOI: 10.1016/j.mito.2022.04.007] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/22/2022] [Revised: 03/30/2022] [Accepted: 04/27/2022] [Indexed: 12/20/2022]
|
11
|
dos Passos Junior RR, Bomfim GF, Giachini FR, Tostes RC, Lima VV. O-Linked β-N-Acetylglucosamine Modification: Linking Hypertension and the Immune System. Front Immunol 2022; 13:852115. [PMID: 35371030 PMCID: PMC8967968 DOI: 10.3389/fimmu.2022.852115] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/10/2022] [Accepted: 02/21/2022] [Indexed: 11/13/2022] Open
Abstract
The O-linked β-N-acetylglucosamine modification (O-GlcNAcylation) of proteins dynamically regulates protein function, localization, stability, and interactions. This post-translational modification is intimately linked to cardiovascular disease, including hypertension. An increasing number of studies suggest that components of innate and adaptive immunity, active players in the pathophysiology of hypertension, are targets for O-GlcNAcylation. In this review, we highlight the potential roles of O-GlcNAcylation in the immune system and discuss how those immune targets of O-GlcNAcylation may contribute to arterial hypertension.
Collapse
Affiliation(s)
- Rinaldo Rodrigues dos Passos Junior
- Institute of Biological and Health Sciences, Federal University of Mato Grosso, Barra do Garças, Brazil
- Institute of Biological Sciences, Federal University of Goias, Goiânia, Brazil
| | | | - Fernanda R. Giachini
- Institute of Biological and Health Sciences, Federal University of Mato Grosso, Barra do Garças, Brazil
- Institute of Biological Sciences, Federal University of Goias, Goiânia, Brazil
| | - Rita C. Tostes
- Department of Pharmacology, Ribeirão Preto Medical School, University of São Paulo, Ribeirão Preto, Brazil
| | - Victor Vitorino Lima
- Institute of Biological and Health Sciences, Federal University of Mato Grosso, Barra do Garças, Brazil
- *Correspondence: Victor Vitorino Lima,
| |
Collapse
|
12
|
Ng YH, Okolo CA, Erickson JR, Baldi JC, Jones PP. Protein O-GlcNAcylation in the heart. Acta Physiol (Oxf) 2021; 233:e13696. [PMID: 34057811 DOI: 10.1111/apha.13696] [Citation(s) in RCA: 14] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/17/2021] [Revised: 05/25/2021] [Accepted: 05/27/2021] [Indexed: 12/30/2022]
Abstract
O-GlcNAcylation is a ubiquitous post-translational modification that is extremely labile and plays a significant role in physiology, including the heart. Sustained activation of cardiac O-GlcNAcylation is frequently associated with alterations in cellular metabolism, leading to detrimental effects on cardiovascular function. This is particularly true during conditions such as diabetes, hypertension, cardiac remodelling, heart failure and arrhythmogenesis. Paradoxically, transient elevation of cardiac protein O-GlcNAcylation can also exert beneficial effects in the heart. There is compelling evidence to suggest that a complex interaction between O-GlcNAcylation and phosphorylation also exists in the heart. Beyond direct functional consequences on cardiomyocytes, O-GlcNAcylation also acts indirectly by altering the function of transcription factors that affect downstream signalling. This review focuses on the potential cardioprotective role of protein O-GlcNAcylation during ischaemia-reperfusion injury, the deleterious consequences of chronically elevated O-GlcNAc levels, the interplay between O-GlcNAcylation and phosphorylation in the cardiomyocytes and the effects of O-GlcNAcylation on other major non-myocyte cell types in the heart.
Collapse
Affiliation(s)
- Yann Huey Ng
- Department of Medicine and HeartOtago University of Otago Dunedin New Zealand
| | - Chidinma A. Okolo
- Department of Physiology and HeartOtago University of Otago Dunedin New Zealand
- Life Sciences Division Diamond Light Source LtdHarwell Science and Innovation Campus Didcot UK
| | - Jeffrey R. Erickson
- Department of Physiology and HeartOtago University of Otago Dunedin New Zealand
| | - James C. Baldi
- Department of Medicine and HeartOtago University of Otago Dunedin New Zealand
| | - Peter P. Jones
- Department of Physiology and HeartOtago University of Otago Dunedin New Zealand
| |
Collapse
|
13
|
Guo X, Deng Y, Zhan L, Shang J, Liu H. O‑GlcNAcylation contributes to intermittent hypoxia‑associated vascular dysfunction via modulation of MAPKs but not CaMKII pathways. Mol Med Rep 2021; 24:744. [PMID: 34435655 PMCID: PMC8430318 DOI: 10.3892/mmr.2021.12384] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/01/2021] [Accepted: 05/28/2021] [Indexed: 11/10/2022] Open
Abstract
Intermittent hypoxia (IH) leads to vascular dysfunction, and O-linked-β-N-acetylglucosamine (O-GlcNAc)ylation may regulate vascular reactivity through the modulation of intracellular signaling. The present study hypothesized that O-GlcNAc modifications contributed to the vascular effects of acute IH (AIH) and chronic IH (CIH) through the MAPK and Ca2+/calmodulin-dependent kinase II (CaMKII) pathways. Rat aortic and mesenteric segments were incubated with DMSO, O-GlcNAcase (OGA) or O-GlcNAc transferase (OGT) inhibitor under either normoxic or AIH conditions for 3 h, and arterial function was then assessed. Meanwhile, arteries isolated from control and CIH rats were exposed to 3 h of incubation under normoxic conditions using DMSO, OGA or OGT as an inhibitor, before assessing arterial reactivity. CIH was found to increase the expression of vascular O-GlcNAc protein and OGT, phosphorylate p38 MAPK and ERK1/2, and decrease OGA levels, but it had no effects on phosphorylated CaMKII levels. OGA inhibition increased global O-GlcNAcylation and the phosphorylation of p38 MAPK, ERK1/2 and CaMKII, whereas OGT blockade had the opposite effects. OGA inhibition preserved acetylcholine-induced relaxation in AIH arteries, whereas OGT blockade attenuated the relaxation responses of arteries under normoxic conditions or undergoing AIH treatments. However, the impairment of acetylcholine dilation in CIH mesenteric arteries was improved. CIH artery contraction was increased following angiotensin II (Ang II) exposure. Blockade of p38 MAPK and ERK1/2, but not CaMKII, attenuated Ang II-induced contractile responses in CIH arteries isolated from the non-OGT inhibitor-treated groups. OGT inhibition significantly blocked contractile responses to Ang II and abolished the inhibitory effects of MAPK inhibitors. These findings indicated that O-GlcNAcylation regulates IH-induced vascular dysfunction, at least partly by modulating MAPK, but not CaMKII, signaling pathways.
Collapse
Affiliation(s)
- Xueling Guo
- Department of Critical Care Medicine, Zhongshan Hospital Affiliated to Xiamen University, Xiamen, Fujian 361004, P.R. China
| | - Yan Deng
- Department of Respiratory and Critical Care Medicine, Key Laboratory of Respiratory Disease of The Ministry of Health, Tongji Hospital, Huazhong University of Science and Technology, Wuhan, Hubei 430030, P.R. China
| | - Linghui Zhan
- Department of Critical Care Medicine, Zhongshan Hospital Affiliated to Xiamen University, Xiamen, Fujian 361004, P.R. China
| | - Jin Shang
- Department of Respiratory and Critical Care Medicine, Key Laboratory of Respiratory Disease of The Ministry of Health, Tongji Hospital, Huazhong University of Science and Technology, Wuhan, Hubei 430030, P.R. China
| | - Huiguo Liu
- Department of Respiratory and Critical Care Medicine, Key Laboratory of Respiratory Disease of The Ministry of Health, Tongji Hospital, Huazhong University of Science and Technology, Wuhan, Hubei 430030, P.R. China
| |
Collapse
|
14
|
Sousa-Lopes A, de Freitas RA, Carneiro FS, Nunes KP, Allahdadi KJ, Webb RC, Tostes RDC, Giachini FR, Lima VV. Angiotensin (1-7) Inhibits Ang II-mediated ERK1/2 Activation by Stimulating MKP-1 Activation in Vascular Smooth Muscle Cells. INTERNATIONAL JOURNAL OF MOLECULAR AND CELLULAR MEDICINE 2020; 9:50-61. [PMID: 32832484 PMCID: PMC7422848 DOI: 10.22088/ijmcm.bums.9.1.50] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Indexed: 11/04/2022]
Abstract
The renin–angiotensin system (RAS) exerts profound physiological effects on blood pressure regulation and fluid homeostasis, mainly by modulating renal, cardiovascular, and central nervous systems. Angiotensin (Ang)-(1-7), an end-product of RAS, is recognized by its cardiovascular protective properties through stimulation of the Mas receptor, including vasodilation, anti-inflammatory, and antihypertensive actions, and consequently, counter-regulating the well-known Ang II-elicited actions. The overall hypothesis of this study is that Ang-(1-7) inhibits Ang II-induced ERK1/2 activation in vascular smooth muscle cells (VSMCs), via regulation of mitogen-activated protein phosphatase-1 (MKP-1) activity. Aortas from male Wistar rats were incubated with Ang-(1-7) or vehicle. Concentration-response curves to Ang II were performed in endothelium-denuded aortas, in the presence or absence of ERK1/2 (PD98059) inhibitor or Mas receptor (A-779) antagonist. Expression of proteins was assessed by western blot, and immunohistochemistry was conducted in VSMCs. Ang-(1-7) incubation decreased Ang II-induced contractile response in aortas, and this effect was not observed in the presence of PD98059 or A-779. Stimulation of VSMCs with Ang-(1-7) prevented Ang II-induced ERK1/2 phosphorylation, but not C-Raf-activation. Furthermore, Ang II decreased MKP-1 phosphorylation in VSMCs. Interestingly, simultaneous incubation of Ang-(1-7) with Ang II favored MKP-1 phosphorylation, negatively modulating ERK1/2 activation in VSMCs. The results suggest that Ang-(1-7) counter-regulates actions evoked by Ang II overproduction, as observed in cardiovascular diseases, mainly by modulating MKP-1 activity. This evidence suggests that the role of Ang-(1-7) in MKP-1-regulation represents a target for new therapeutic development.
Collapse
Affiliation(s)
- Alejandra Sousa-Lopes
- Institute of Biological and Health Sciences, Federal University of Mato Grosso, Barra do Garças, MT, Brazil
| | - Raiany Alves de Freitas
- Institute of Biological and Health Sciences, Federal University of Mato Grosso, Barra do Garças, MT, Brazil
| | - Fernando Silva Carneiro
- Department of Pharmacology, Ribeirao Preto Medical School, University of Sao Paulo, Ribeirao Preto, SP, Brazil
| | - Kenia Pedrosa Nunes
- Department of Biomedical and Chemical Engineering and Sciences, Florida Institute of Technology, United States
| | | | | | - Rita de Cassia Tostes
- Department of Pharmacology, Ribeirao Preto Medical School, University of Sao Paulo, Ribeirao Preto, SP, Brazil
| | - Fernanda Regina Giachini
- Institute of Biological and Health Sciences, Federal University of Mato Grosso, Barra do Garças, MT, Brazil
| | - Victor Vitorino Lima
- Institute of Biological and Health Sciences, Federal University of Mato Grosso, Barra do Garças, MT, Brazil
| |
Collapse
|
15
|
Chatham JC, Zhang J, Wende AR. Role of O-Linked N-Acetylglucosamine Protein Modification in Cellular (Patho)Physiology. Physiol Rev 2020; 101:427-493. [PMID: 32730113 DOI: 10.1152/physrev.00043.2019] [Citation(s) in RCA: 148] [Impact Index Per Article: 37.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023] Open
Abstract
In the mid-1980s, the identification of serine and threonine residues on nuclear and cytoplasmic proteins modified by a N-acetylglucosamine moiety (O-GlcNAc) via an O-linkage overturned the widely held assumption that glycosylation only occurred in the endoplasmic reticulum, Golgi apparatus, and secretory pathways. In contrast to traditional glycosylation, the O-GlcNAc modification does not lead to complex, branched glycan structures and is rapidly cycled on and off proteins by O-GlcNAc transferase (OGT) and O-GlcNAcase (OGA), respectively. Since its discovery, O-GlcNAcylation has been shown to contribute to numerous cellular functions, including signaling, protein localization and stability, transcription, chromatin remodeling, mitochondrial function, and cell survival. Dysregulation in O-GlcNAc cycling has been implicated in the progression of a wide range of diseases, such as diabetes, diabetic complications, cancer, cardiovascular, and neurodegenerative diseases. This review will outline our current understanding of the processes involved in regulating O-GlcNAc turnover, the role of O-GlcNAcylation in regulating cellular physiology, and how dysregulation in O-GlcNAc cycling contributes to pathophysiological processes.
Collapse
Affiliation(s)
- John C Chatham
- Division of Molecular and Cellular Pathology, Department of Pathology, University of Alabama at Birmingham, Birmingham, Alabama; and Birmingham Veterans Affairs Medical Center, Birmingham, Alabama
| | - Jianhua Zhang
- Division of Molecular and Cellular Pathology, Department of Pathology, University of Alabama at Birmingham, Birmingham, Alabama; and Birmingham Veterans Affairs Medical Center, Birmingham, Alabama
| | - Adam R Wende
- Division of Molecular and Cellular Pathology, Department of Pathology, University of Alabama at Birmingham, Birmingham, Alabama; and Birmingham Veterans Affairs Medical Center, Birmingham, Alabama
| |
Collapse
|
16
|
Ju Kim E. O‐GlcNAc Transferase: Structural Characteristics, Catalytic Mechanism and Small‐Molecule Inhibitors. Chembiochem 2020; 21:3026-3035. [DOI: 10.1002/cbic.202000194] [Citation(s) in RCA: 16] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/28/2020] [Revised: 05/07/2020] [Indexed: 12/21/2022]
Affiliation(s)
- Eun Ju Kim
- Department of Science Education-Chemistry Major Daegu University Gyeongsan-si, GyeongBuk 712-714 South Korea
| |
Collapse
|
17
|
Collins HE, Chatham JC. Regulation of cardiac O-GlcNAcylation: More than just nutrient availability. Biochim Biophys Acta Mol Basis Dis 2020; 1866:165712. [PMID: 32014551 PMCID: PMC7703857 DOI: 10.1016/j.bbadis.2020.165712] [Citation(s) in RCA: 18] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/01/2019] [Revised: 01/15/2020] [Accepted: 01/27/2020] [Indexed: 12/12/2022]
Abstract
The post-translational modification of serine and threonine residues of nuclear, cytosolic, and mitochondrial proteins by O-linked β-N-acetyl glucosamine (O-GlcNAc) has long been seen as an important regulatory mechanism in the cardiovascular system. O-GlcNAcylation of cardiac proteins has been shown to contribute to the regulation of transcription, metabolism, mitochondrial function, protein quality control and turnover, autophagy, and calcium handling. In the heart, acute increases in O-GlcNAc have been associated with cardioprotection, such as those observed during ischemia/reperfusion. Conversely, chronic increases in O-GlcNAc, often associated with diabetes and nutrient excess, have been shown to contribute to cardiac dysfunction. Traditionally, many studies have linked changes in O-GlcNAc with nutrient availability and as such O-GlcNAcylation is often seen as a nutrient driven process. However, emerging evidence suggests that O-GlcNAcylation may also be regulated by non-nutrient dependent mechanisms, such as transcriptional and post-translational regulation. Therefore, the goals of this review are to provide an overview of the impact of O-GlcNAcylation in the cardiovascular system, how this is regulated and to discuss the emergence of regulatory mechanisms other than nutrient availability.
Collapse
Affiliation(s)
- Helen E Collins
- Division of Environmental Medicine, Department of Medicine, University of Louisville, Louisville, KY, United States of America
| | - John C Chatham
- Division of Molecular and Cellular Pathology, Department of Pathology, University of Alabama at Birmingham, Birmingham, AL, United States of America.
| |
Collapse
|
18
|
Rehman S, Obaid A, Naz A, Ali A, Kanwal S, Ahmad J. Model-based in silico analysis of the PI3K/Akt pathway: the elucidation of cross-talk between diabetes and breast cancer. PeerJ 2018; 6:e5917. [PMID: 30515357 PMCID: PMC6265603 DOI: 10.7717/peerj.5917] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/27/2018] [Accepted: 10/11/2018] [Indexed: 12/16/2022] Open
Abstract
BACKGROUND A positive association between diabetes and breast cancer has been identified by various epidemiological and clinical studies. However, the possible molecular interactions between the two heterogeneous diseases have not been fully determined yet. There are several underlying mechanisms which may increase the risk of breast cancer in diabetic patients. INTRODUCTION In this study, we focused on the role of O-GlcNAc transferase (OGT) enzyme in the regulation of phosphatidylinositol-3 kinase (PI3K) pathway through activation/deactivation of Akt protein. The efficiency of insulin signaling in adipocytes is reduced as a result of OGT overexpression which further attenuates Akt signaling; as a result, the efficiency of insulin signaling is reduced by downregulation of insulin-responsive genes. On the other hand, increased expression of OGT results in Akt activation in breast cancer cells, leading to enhanced cell proliferation and inhibition of the apoptosis. However, the interplay amongst these signaling pathways is still under investigation. METHODS In this study, we used Petri nets (PNs) to model and investigate the role of PI3K and OGT pathways, acting as key players in crosstalk between diabetes and breast cancer, resulting in progression of these chronic diseases. Moreover, in silico perturbation experiments were applied on the model to analyze the effects of anti-cancer agents (shRNA and BZX) and anti-diabetic drug (Metformin) on the system. RESULTS Our PN model reflects the alterations in protein expression and behavior and the correlation between breast cancer and diabetes. The analysis proposed two combination therapies to combat breast cancer progression in diabetic patients including combination of OGTmRNA silencing and OGT inhibitor (BZX) as first combination and BZX and Metformin as the second. CONCLUSION The PN model verified that alterations in O-GlcNAc signaling affect both insulin resistance and breast cancer. Moreover, the combination therapy for breast cancer patients consisting of anti-diabetic drugs such as Metformin along with OGT inhibitors, for example BZX, can produce better treatment regimens.
Collapse
Affiliation(s)
- Sammia Rehman
- Atta-ur-Rahman School of Applied Biosciences (ASAB), National University of Science and Technology, Islamabad, Pakistan
| | - Ayesha Obaid
- Atta-ur-Rahman School of Applied Biosciences (ASAB), National University of Science and Technology, Islamabad, Pakistan
| | - Anam Naz
- Atta-ur-Rahman School of Applied Biosciences (ASAB), National University of Science and Technology, Islamabad, Pakistan
| | - Amjad Ali
- Atta-ur-Rahman School of Applied Biosciences (ASAB), National University of Science and Technology, Islamabad, Pakistan
| | - Shahzina Kanwal
- Guangzhou Institutes of Biomedicine and Health, Guangzhou, China
| | - Jamil Ahmad
- Research Center for Modeling & Simulation (RCMS), National University of Sciences and Technology, Islamabad, Pakistan
| |
Collapse
|
19
|
O-GlcNAcylation on Rab3A attenuates its effects on mitochondrial oxidative phosphorylation and metastasis in hepatocellular carcinoma. Cell Death Dis 2018; 9:970. [PMID: 30237463 PMCID: PMC6148238 DOI: 10.1038/s41419-018-0961-7] [Citation(s) in RCA: 20] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/29/2018] [Revised: 08/07/2018] [Accepted: 08/20/2018] [Indexed: 12/13/2022]
Abstract
Rab3A is a small Ras-like GTPase critical for membrane traffic. Although the functions of Rab3A have been reported in several cancers, the roles of Rab3A in hepatocellular carcinoma (HCC) have never been determined. To investigate the potential roles of Rab3A in HCC progression, we first determined Rab3A levels in HCC tissues and observed upregulated mRNA and protein levels of Rab3A in most tumor tissues. However, in vitro data showed that decreasing Rab3A in most HCC cell lines conferred no significant effects and overexpressing Rab3A in PLC/PRF/5 cells even inhibited migration and invasion. Meanwhile, the upregulation of Rab3A in HCC patients did not correlate with metastasis or overall survival of HCC patients. These contradict data suggested that Rab3A might act as metastatic suppressor and its effects might be attenuated in most HCC cells. Further experiments revealed that O-GlcNAcylation on Rab3A was key for attenuating Rab3A-mediated effects by regulating its GTP-binding activity, and verified the effects of Rab3A and its aberrant O-GlcNAcylation on HCC metastasis in vitro and in vivo. We also found that Rab3A and its O-GlcNAcylation had opposite roles in mitochondria oxidative phosphorylation (mtOXPHOS), and their functions on HCC metastasis were partially depended on their effects on metabolic reprogramming.
Collapse
|
20
|
O-Glycosylation with O-linked β-N-acetylglucosamine increases vascular contraction: Possible modulatory role on Interleukin-10 signaling pathway. Life Sci 2018; 209:78-84. [PMID: 30075176 DOI: 10.1016/j.lfs.2018.07.058] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/30/2018] [Revised: 07/27/2018] [Accepted: 07/30/2018] [Indexed: 01/29/2023]
Abstract
AIMS The interleukin-10 (IL-10) is an immuno-regulatory cytokine that plays a protective effect in the vasculature. IL-10 binding to its receptor, activating the IL-10/JAK1/STAT3 cascade to exert its effects. Therefore, STAT3 phosphorylation is essential for IL-10 actions. O-Glycosylation with linked β-N-acetylglucosamine (O-GlcNAc) is a post-translational modification able to regulate many proteins by interfering with protein on a phosphorylation level. Our aim was to determine whether O-GlcNAc promotes the inhibition of IL-10-pathway (JAK1/STAT3/IL-10), inactivationg its action in the vasculature. MAIN METHODS Mice (C57BL/6) aortic segments were incubated with vehicle or Thiamet G (0.1 mM, for 24 h) to increase global O-GlcNAc levels. Aortas from knockout mice for IL-10 were also used. Vascular reactivity and western blot tests were performed to evaluate protein expression. KEY FINDINGS High levels of O-GlcNAc, induced by Thiamet G incubation, increased vascular expression of JAK1, but decreased expression and activity of STAT3. In addition, IL-10 levels were diminished in arteries treated with Thiamet G. Absence of IL-10, as well as augmented O-GlcNAcylation, increased vascular reactivity to constrictor stimuli, an effect that was abolished by ERK 1/2 inhibitor. High levels of O-GlcNAc and the absence of IL-10 also leads to increased vascular expression of ERK1/2. SIGNIFICANCE Our data suggest that O-GlcNAc modification seems to (dys)regulate IL-10 signaling pathway and consequently, compromise the protective effect of this cytokine in vasculature. It is possible that there is a promising relationship in pathophysiological conditions where changes in O-GlcNAcylation and IL-10 levels are observed, such as hypertension and diabetes.
Collapse
|
21
|
Li Z, Li X, Nai S, Geng Q, Liao J, Xu X, Li J. Checkpoint kinase 1-induced phosphorylation of O-linked β- N-acetylglucosamine transferase regulates the intermediate filament network during cytokinesis. J Biol Chem 2017; 292:19548-19555. [PMID: 29021254 DOI: 10.1074/jbc.m117.811646] [Citation(s) in RCA: 28] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/10/2017] [Revised: 09/27/2017] [Indexed: 01/12/2023] Open
Abstract
Checkpoint kinase 1 (Chk1) is a kinase instrumental for orchestrating DNA replication, DNA damage checkpoints, the spindle assembly checkpoint, and cytokinesis. Despite Chk1's pivotal role in multiple cellular processes, many of its substrates remain elusive. Here, we identified O-linked β-N-acetylglucosamine (O-GlcNAc)-transferase (OGT) as one of Chk1's substrates. We found that Chk1 interacts with and phosphorylates OGT at Ser-20, which not only stabilizes OGT, but also is required for cytokinesis. Phospho-specific antibodies of OGT-pSer-20 exhibited specific signals at the midbody of the cell, consistent with midbody localization of OGT as reported previously. Moreover, phospho-deficient OGT (S20A) cells attenuated cellular O-GlcNAcylation levels and also reduced phosphorylation of Ser-71 in the cytoskeletal protein vimentin, a modification critical for severing vimentin filament during cytokinesis. Consequently, elongated vimentin bridges were observed in cells depleted of OGT via an siOGT-based approach. Lastly, expression of plasmids resistant to siOGT efficiently rescued the vimentin bridge phenotype, but the OGT-S20A rescue plasmids did not. Our results suggest a Chk1-OGT-vimentin pathway that regulates the intermediate filament network during cytokinesis.
Collapse
Affiliation(s)
- Zhe Li
- From the Beijing Key Laboratory of DNA Damage Response and College of Life Sciences, Capital Normal University, Beijing 100048, China and
| | - Xueyan Li
- From the Beijing Key Laboratory of DNA Damage Response and College of Life Sciences, Capital Normal University, Beijing 100048, China and
| | - Shanshan Nai
- From the Beijing Key Laboratory of DNA Damage Response and College of Life Sciences, Capital Normal University, Beijing 100048, China and
| | - Qizhi Geng
- From the Beijing Key Laboratory of DNA Damage Response and College of Life Sciences, Capital Normal University, Beijing 100048, China and
| | - Ji Liao
- From the Beijing Key Laboratory of DNA Damage Response and College of Life Sciences, Capital Normal University, Beijing 100048, China and
| | - Xingzhi Xu
- From the Beijing Key Laboratory of DNA Damage Response and College of Life Sciences, Capital Normal University, Beijing 100048, China and .,the Guangdong Key Laboratory of Genome Stability & Disease Prevention, Shenzhen University School of Medicine, Shenzhen, Guangdong 518060, China
| | - Jing Li
- From the Beijing Key Laboratory of DNA Damage Response and College of Life Sciences, Capital Normal University, Beijing 100048, China and
| |
Collapse
|
22
|
Souza-Silva L, Alves-Lopes R, Silva Miguez J, Dela Justina V, Neves KB, Mestriner FL, Tostes RDC, Giachini FR, Lima VV. Glycosylation with O-linked β-N-acetylglucosamine induces vascular dysfunction via production of superoxide anion/reactive oxygen species. Can J Physiol Pharmacol 2017; 96:232-240. [PMID: 28793197 DOI: 10.1139/cjpp-2017-0225] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
Abstract
Overproduction of superoxide anion (•O2-) and O-linked β-N-acetylglucosamine (O-GlcNAc) modification in the vascular system are contributors to endothelial dysfunction. This study tested the hypothesis that increased levels of O-GlcNAc-modified proteins contribute to •O2- production via activation of NADPH oxidase, resulting in impaired vasodilation. Rat aortic segments and vascular smooth muscle cells (VSMCs) were incubated with vehicle (methanol) or O-(2-acetamido-2-deoxy-d-glucopyranosylidenamino) N-phenylcarbamate (PUGNAc) (100 μM). PUGNAc produced a time-dependent increase in O-GlcNAc levels in VSMC and decreased endothelium-dependent relaxation, which was prevented by apocynin and tiron, suggesting that •O2- contributes to endothelial dysfunction under augmented O-GlcNAc levels. Aortic segments incubated with PUGNAc also exhibited increased levels of reactive oxygen species, assessed by dihydroethidium fluorescence, and augmented •O2- production, determined by lucigenin-enhanced chemiluminescence. Additionally, PUGNAc treatment increased Nox-1 and Nox-4 protein expression in aortas and VSMCs. Translocation of the p47phox subunit from the cytosol to the membrane was greater in aortas incubated with PUGNAc. VSMCs displayed increased p22phox protein expression after PUGNAc incubation, suggesting that NADPH oxidase is activated in conditions where O-GlcNAc protein levels are increased. In conclusion, O-GlcNAc levels reduce endothelium-dependent relaxation by overproduction of •O2- via activation of NADPH oxidase. This may represent an additional mechanism by which augmented O-GlcNAc levels impair vascular function.
Collapse
Affiliation(s)
- Leonardo Souza-Silva
- a Institute of Biological and Health Sciences, Federal University of Mato Grosso, Barra do Garças, MT, Brazil
| | - Rheure Alves-Lopes
- b Department of Pharmacology, Ribeirao Preto Medical School, University of São Paulo, Ribeirao Preto, Brazil.,c Institute of Cardiovascular and Medical Sciences, BHF Glasgow Cardiovascular Research Centre, University of Glasgow, Glasgow, UK
| | - Jéssica Silva Miguez
- a Institute of Biological and Health Sciences, Federal University of Mato Grosso, Barra do Garças, MT, Brazil
| | - Vanessa Dela Justina
- a Institute of Biological and Health Sciences, Federal University of Mato Grosso, Barra do Garças, MT, Brazil
| | - Karla Bianca Neves
- b Department of Pharmacology, Ribeirao Preto Medical School, University of São Paulo, Ribeirao Preto, Brazil.,c Institute of Cardiovascular and Medical Sciences, BHF Glasgow Cardiovascular Research Centre, University of Glasgow, Glasgow, UK
| | - Fabíola Leslie Mestriner
- b Department of Pharmacology, Ribeirao Preto Medical School, University of São Paulo, Ribeirao Preto, Brazil
| | - Rita de Cassia Tostes
- b Department of Pharmacology, Ribeirao Preto Medical School, University of São Paulo, Ribeirao Preto, Brazil
| | - Fernanda Regina Giachini
- a Institute of Biological and Health Sciences, Federal University of Mato Grosso, Barra do Garças, MT, Brazil
| | - Victor Vitorino Lima
- a Institute of Biological and Health Sciences, Federal University of Mato Grosso, Barra do Garças, MT, Brazil
| |
Collapse
|
23
|
Cai X, Bao L, Ding Y, Dai X, Zhang Z, Li Y. Quercetin alleviates cell apoptosis and inflammation via the ER stress pathway in vascular endothelial cells cultured in high concentrations of glucosamine. Mol Med Rep 2016; 15:825-832. [PMID: 28000870 DOI: 10.3892/mmr.2016.6054] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/24/2015] [Accepted: 11/03/2016] [Indexed: 11/06/2022] Open
Abstract
Glucosamine is a possible cause of vascular endothelial injury in the initial stages of atherosclerosis, through endoplasmic reticulum (ER) stress resulting in fatty streaks in the vascular wall. Quercetin is an anti‑diabetic and cardiovascular protective agent that has previously been demonstrated to reduce ER stress in human umbilical vein endothelial cells (HUVECs). The present study aimed to investigate whether quercetin prevents glucosamine‑induced apoptosis and inflammation via ER stress pathway in HUVECs. The effect of quercetin on cell viability, apoptosis, and protein expression levels of inflammatory cytokines and ER stress markers was investigated in glucosamine‑supplemented HUVECs. Quercetin was demonstrated to protect against glucosamine‑induced apoptosis, improved cell viability, and inhibited expression of pro‑inflammatory factors and endothelin‑1. Quercetin treatment also reduced the expression levels of glucose‑regulated protein 78, phosphorylated protein kinase‑like ER kinase, phosphorylated c‑Jun N‑terminal kinase and C/EBP homologous protein. In conclusion, quercetin may have auxiliary therapeutic potential against glucosamine‑induced cell apoptosis and inflammation, which may be partially due to alleviation of ER stress.
Collapse
Affiliation(s)
- Xiaxia Cai
- Department of Nutrition and Food Hygiene, School of Public Health, Peking University, Beijing 100191, P.R. China
| | - Lei Bao
- Department of Clinical Nutrition, Peking University International Hospital, Beijing 100191, P.R. China
| | - Ye Ding
- Department of Maternal, Child and Adolescent Health, School of Public Health, Nanjing Medical University, Nanjing, Jiangsu 211166, P.R. China
| | - Xiaoqian Dai
- Department of Nutrition and Food Hygiene, School of Public Health, Peking University, Beijing 100191, P.R. China
| | - Zhaofeng Zhang
- Department of Nutrition and Food Hygiene, School of Public Health, Peking University, Beijing 100191, P.R. China
| | - Yong Li
- Department of Nutrition and Food Hygiene, School of Public Health, Peking University, Beijing 100191, P.R. China
| |
Collapse
|
24
|
Abstract
The O-linked N-acetylglucosamine (O-GlcNAc) post-translational modification (O-GlcNAcylation) is the dynamic and reversible attachment of N-acetylglucosamine to serine and threonine residues of nucleocytoplasmic target proteins. It is abundant in metazoa, involving hundreds of proteins linked to a plethora of biological functions with implications in human diseases. The process is catalysed by two enzymes: O-GlcNAc transferase (OGT) and O-GlcNAcase (OGA) that add and remove sugar moieties respectively. OGT knockout is embryonic lethal in a range of animal models, hampering the study of the biological role of O-GlcNAc and the dissection of catalytic compared with non-catalytic roles of OGT. Therefore, selective and potent chemical tools are necessary to inhibit OGT activity in the context of biological systems. The present review focuses on the available OGT inhibitors and summarizes advantages, limitations and future challenges.
Collapse
|
25
|
High-fat diet increases O-GlcNAc levels in cerebral arteries: a link to vascular dysfunction associated with hyperlipidaemia/obesity? Clin Sci (Lond) 2016; 130:871-80. [PMID: 26929437 DOI: 10.1042/cs20150777] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/28/2015] [Accepted: 02/29/2016] [Indexed: 01/06/2023]
Abstract
Obesity and high fat intake induce alterations in vascular function and structure. Aberrant O-GlcNAcylation (O-GlcNAc) of vascular proteins has been implicated in vascular dysfunction associated with cardiovascular and metabolic diseases. In the present study, we tested the hypothesis that high-fat diet (HFD)-mediated increases in O-GlcNAc-modified proteins contribute to cerebrovascular dysfunction. O-GlcNAc-protein content was increased in arteries from male Wistar rats treated with a HFD (45% fat) for 12 weeks compared with arteries from rats on control diet (CD). HFD augmented body weight [(g) 550±10 compared with 502±10 CD], increased plasma triacylglycerols [(mg/dl) 160±20 compared with 95±15 CD] and increased contractile responses of basilar arteries to serotonin [5-hydroxytryptamine (5-HT)] [(pD2) 7.0±0.1 compared with 6.7±0.09 CD] and the thromboxane analogue 9,11-dideoxy-9α,11α-methanoepoxy prostaglandin F2α (U-46619) [(pD2) 7.2±0.1 compared with 6.8±0.09 CD]. Of importance, increased levels of O-GlcNAc [induced by 24 h-incubation of vessels with a potent inhibitor of O-GlcNAcase (OGA), O-(2-acetamido-2-deoxy-D-glucopyranosylidene)amino-N-phenylcarbamate (PugNAc)] increased basilar artery contractions in response to U-46619 [(pD2) 7.4±0.07 compared with 6.8±0.08 CD] and 5-HT [(pD2) 7.5±0.06 compared with 7.1±0.1 CD]. Vessels from rats on the HFD for 12 weeks and vessels treated with PugNAc displayed increased phosphorylation of p38 (Thr(180/182)) and extracellular signal-regulated kinase 1/2 (Erk1/2) (Ser(180/221)). Increased 5HT-induced contractions in arteries from rats on the HFD or in arteries incubated with PugNAc were abrogated by mitogen-activated protein kinase (MAPK) inhibitors. Our data show that HFD augments cerebrovascular O-GlcNAc and this modification contributes to increased contractile responses and to the activation of the MAPK pathway in the rat basilar artery.
Collapse
|
26
|
Liu H, Gu Y, Qi J, Han C, Zhang X, Bi C, Yu W. Inhibition of E-cadherin/catenin complex formation by O-linked N-acetylglucosamine transferase is partially independent of its catalytic activity. Mol Med Rep 2015; 13:1851-60. [PMID: 26707622 DOI: 10.3892/mmr.2015.4718] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/03/2015] [Accepted: 11/24/2015] [Indexed: 11/06/2022] Open
Abstract
p120-catenin (p120) contains a large central armadillo repeat domain, via which it binds to E‑cadherin to stabilize the latter, thereby regulating cell‑to‑cell adhesion. A previous study by our group demonstrated that O‑linked N‑acetylglucosamine (O‑GlcNAc) is involved in the regulation of the interaction between p120 and E‑cadherin. As O‑GlcNAc transferase (OGT) is able to directly bind to the majority of its target proteins, the present study hypothesized that OGT may additionally regulate the formation of the E‑cadherin/catenin complex independent of its catalytic activity. To verify this hypothesis, a catalytically inactive OGT mutant was expressed in H1299 cells, and its effects on the formation of the E‑cadherin/catenin complex were assessed. A cytoskeleton‑binding protein extraction assay confirmed that OGT inhibited the formation of the E‑cadherin/catenin complex independent of its catalytic activity. In addition, co‑immunoprecipitation and pull‑down assays were used to evaluate the interaction between OGT and p120. Immunoblotting indicated that OGT was able to directly bind to p120. To determine the domain of p120 involved in binding to OGT, a series of deletion mutants of p120 were constructed and subjected to protein binding assays by pull‑down assays. Immunoblotting showed that OGT bound to the regulatory and armadillo domains of p120, which might interfere with the interaction between p120 and E‑cadherin. Finally, OGT, p120 and E‑cadherin cytoplasmic domains (ECD) were recombinantly expressed in BL21 (DE3) recombinant E. coli cells, and a glutathione S‑transferase (GST) pull‑down assay was performed to assess the interactions among the purified recombinant proteins. Immunoblotting indicated that maltose‑binding protein (MBP)‑OGT inhibited the binding of His‑p120 to GST‑ECD in a dose‑dependent manner. All of these results suggested that OGT inhibited the formation of the E‑cadherin/catenin complex through reducing the interaction between p120 and E‑cadherin. The present study provided a novel underlying mechanism of the regulation of the interaction between p120 and E‑cadherin, and thus E‑cadherin‑mediated cell‑cell adhesion, which has essential roles in cancer development and progression.
Collapse
Affiliation(s)
- Haiyan Liu
- Department of Glycobiology, School of Medicine and Pharmacy, Ocean University of China, Qingdao, Shandong 266003, P.R. China
| | - Yuchao Gu
- Department of Glycobiology, School of Medicine and Pharmacy, Ocean University of China, Qingdao, Shandong 266003, P.R. China
| | - Jieqiong Qi
- Department of Glycobiology, School of Medicine and Pharmacy, Ocean University of China, Qingdao, Shandong 266003, P.R. China
| | - Cuifang Han
- Department of Glycobiology, School of Medicine and Pharmacy, Ocean University of China, Qingdao, Shandong 266003, P.R. China
| | - Xinling Zhang
- Department of Glycobiology, School of Medicine and Pharmacy, Ocean University of China, Qingdao, Shandong 266003, P.R. China
| | - Chuanlin Bi
- Department of Glycobiology, School of Medicine and Pharmacy, Ocean University of China, Qingdao, Shandong 266003, P.R. China
| | - Wengong Yu
- Department of Glycobiology, School of Medicine and Pharmacy, Ocean University of China, Qingdao, Shandong 266003, P.R. China
| |
Collapse
|
27
|
Marsh SA, Collins HE, Chatham JC. Protein O-GlcNAcylation and cardiovascular (patho)physiology. J Biol Chem 2014; 289:34449-56. [PMID: 25336635 DOI: 10.1074/jbc.r114.585984] [Citation(s) in RCA: 65] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022] Open
Abstract
Our understanding of the role of protein O-GlcNAcylation in the regulation of the cardiovascular system has increased rapidly in recent years. Studies have linked increased O-GlcNAc levels to glucose toxicity and diabetic complications; conversely, acute activation of O-GlcNAcylation has been shown to be cardioprotective. However, it is also increasingly evident that O-GlcNAc turnover plays a central role in the delicate regulation of the cardiovascular system. Therefore, the goals of this minireview are to summarize our current understanding of how changes in O-GlcNAcylation influence cardiovascular pathophysiology and to highlight the evidence that O-GlcNAc cycling is critical for normal function of the cardiovascular system.
Collapse
Affiliation(s)
- Susan A Marsh
- From the Section of Experimental and Systems Pharmacology, College of Pharmacy, Washington State University, Spokane, Washington 99210-1495 and
| | - Helen E Collins
- the Division of Molecular and Cellular Pathology, Department of Pathology, University of Alabama at Birmingham, Birmingham, Alabama 35294-0019
| | - John C Chatham
- the Division of Molecular and Cellular Pathology, Department of Pathology, University of Alabama at Birmingham, Birmingham, Alabama 35294-0019
| |
Collapse
|
28
|
Mazzuca MQ, Dang Y, Khalil RA. Enhanced endothelin receptor type B-mediated vasodilation and underlying [Ca²⁺]i in mesenteric microvessels of pregnant rats. Br J Pharmacol 2014; 169:1335-51. [PMID: 23646960 DOI: 10.1111/bph.12225] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/14/2012] [Revised: 03/18/2013] [Accepted: 04/05/2013] [Indexed: 01/05/2023] Open
Abstract
BACKGROUND AND PURPOSE Normal pregnancy is associated with decreased vascular resistance and increased release of vasodilators. Endothelin-1 (ET-1) causes vasoconstriction via endothelin receptor type A (ET(A)R), but could activate ET(B)R in the endothelium and release vasodilator substances. However, the roles of ET(B)R in the regulation of vascular function during pregnancy and the vascular mediators involved are unclear. EXPERIMENTAL APPROACH Pressurized mesenteric microvessels from pregnant and virgin Sprague-Dawley rats were loaded with fura-2/AM for simultaneous measurement of diameter and [Ca²⁺]i. KEY RESULTS High KCl (51 mM) and phenylephrine (PHE) caused increases in vasoconstriction and [Ca²⁺]i that were similar in pregnant and virgin rats. ET-1 caused vasoconstriction that was less in pregnant than virgin rats, with small increases in [Ca²⁺]i. Pretreatment with the ET(B)R antagonist BQ-788 caused greater enhancement of ET-1-induced vasoconstriction in pregnant rats. ACh caused endothelium-dependent relaxation and decreased [Ca²⁺]i, and was more potent in pregnant than in virgin rats. ET-1 + ET(A)R antagonist BQ-123, and the ET(B)R agonists sarafotoxin 6c (S6c) and IRL-1620 caused greater vasodilation in pregnant than in virgin rats with no changes in [Ca²⁺]i, suggesting up-regulated ET(B)R-mediated relaxation pathways. ACh-, S6c- and IRL-1620-induced relaxation was reduced by the NO synthase inhibitor Nω-nitro-L-arginine methyl ester, and abolished by tetraethylammonium or endothelium removal. Western blots revealed greater amount of ET(B)R in intact microvessels of pregnant than virgin rats, but reduced levels in endothelium-denuded microvessels, supporting a role of endothelial ET(B)R. CONCLUSIONS AND IMPLICATIONS The enhanced ET(B)R-mediated microvascular relaxation may contribute to the decreased vasoconstriction and vascular resistance during pregnancy.
Collapse
Affiliation(s)
- Marc Q Mazzuca
- Vascular Surgery Research Laboratory, Division of Vascular and Endovascular Surgery, Harvard Medical School, Brigham and Women's Hospital, Boston, MA 02115, USA
| | | | | |
Collapse
|
29
|
Lima VV, Lobato NS, Filgueira FP, Webb RC, Tostes RC, Giachini FR. Vascular O-GlcNAcylation augments reactivity to constrictor stimuli by prolonging phosphorylated levels of the myosin light chain. ACTA ACUST UNITED AC 2014; 47:826-33. [PMID: 25140811 PMCID: PMC4181217 DOI: 10.1590/1414-431x20144001] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/31/2014] [Accepted: 06/09/2014] [Indexed: 01/31/2024]
Abstract
O-GlcNAcylation is a modification that alters the function of numerous proteins. We hypothesized that augmented O-GlcNAcylation levels enhance myosin light chain kinase (MLCK) and reduce myosin light chain phosphatase (MLCP) activity, leading to increased vascular contractile responsiveness. The vascular responses were measured by isometric force displacement. Thoracic aorta and vascular smooth muscle cells (VSMCs) from rats were incubated with vehicle or with PugNAc, which increases O-GlcNAcylation. In addition, we determined whether proteins that play an important role in the regulation of MLCK and MLCP activity are directly affected by O-GlcNAcylation. PugNAc enhanced phenylephrine (PE) responses in rat aortas (maximal effect, 14.2 ± 2 vs 7.9 ± 1 mN for vehicle, n=7). Treatment with an MLCP inhibitor (calyculin A) augmented vascular responses to PE (13.4 ± 2 mN) and abolished the differences in PE-response between the groups. The effect of PugNAc was not observed when vessels were preincubated with ML-9, an MLCK inhibitor (7.3 ± 2 vs 7.5 ± 2 mN for vehicle, n=5). Furthermore, our data showed that differences in the PE-induced contractile response between the groups were abolished by the activator of AMP-activated protein kinase (AICAR; 6.1 ± 2 vs 7.4 ± 2 mN for vehicle, n=5). PugNAc increased phosphorylation of myosin phosphatase target subunit 1 (MYPT-1) and protein kinase C-potentiated inhibitor protein of 17 kDa (CPI-17), which are involved in RhoA/Rho-kinase-mediated inhibition of myosin phosphatase activity. PugNAc incubation produced a time-dependent increase in vascular phosphorylation of myosin light chain and decreased phosphorylation levels of AMP-activated protein kinase, which decreased the affinity of MLCK for Ca(2+)/calmodulin. Our data suggest that proteins that play an important role in the regulation of MLCK and MLCP activity are directly affected by O-GlcNAcylation, favoring vascular contraction.
Collapse
Affiliation(s)
- V V Lima
- Instituto de Ciências Biológicas e da Saúde, Universidade Federal de Mato Grosso, Barra do Garças, MT, Brasil
| | - N S Lobato
- Curso de Medicina, Setor de Fisiologia Humana, Universidade Federal de Goiás, Jataí, GO, Brasil
| | - F P Filgueira
- Curso de Medicina, Setor de Fisiologia Humana, Universidade Federal de Goiás, Jataí, GO, Brasil
| | - R C Webb
- Department of Physiology, Georgia Regents University, Augusta, GA, USA
| | - R C Tostes
- Departamento de Farmacologia, Faculdade de Medicina de Ribeirão Preto, Universidade de São Paulo, Ribeirão Preto, SP, Brasil
| | - F R Giachini
- Instituto de Ciências Biológicas e da Saúde, Universidade Federal de Mato Grosso, Barra do Garças, MT, Brasil
| |
Collapse
|
30
|
Serine carboxypeptidase SCPEP1 and Cathepsin A play complementary roles in regulation of vasoconstriction via inactivation of endothelin-1. PLoS Genet 2014; 10:e1004146. [PMID: 24586188 PMCID: PMC3937211 DOI: 10.1371/journal.pgen.1004146] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/29/2013] [Accepted: 12/13/2013] [Indexed: 11/19/2022] Open
Abstract
The potent vasoconstrictor peptides, endothelin 1 (ET-1) and angiotensin II control adaptation of blood vessels to fluctuations of blood pressure. Previously we have shown that the circulating level of ET-1 is regulated through its proteolytic cleavage by secreted serine carboxypeptidase, cathepsin A (CathA). However, genetically-modified mouse expressing catalytically inactive CathA S190A mutant retained about 10-15% of the carboxypeptidase activity against ET-1 in its tissues suggesting a presence of parallel/redundant catabolic pathway(s). In the current work we provide direct evidence that the enzyme, which complements CathA action towards ET-1 is a retinoid-inducible lysosomal serine carboxypeptidase 1 (Scpep1), a CathA homolog with previously unknown biological function. We generated a mouse strain devoid of both CathA and Scpep1 activities (DD mice) and found that in response to high-salt diet and systemic injections of ET-1 these animals showed significantly increased blood pressure as compared to wild type mice or those with single deficiencies of CathA or Scpep1. We also found that the reactivity of mesenteric arteries from DD mice towards ET-1 was significantly higher than that for all other groups of mice. The DD mice had a reduced degradation rate of ET-1 in the blood whereas their cultured arterial vascular smooth muscle cells showed increased ET-1-dependent phosphorylation of myosin light chain 2. Together, our results define the biological role of mammalian serine carboxypeptidase Scpep1 and suggest that Scpep1 and CathA together participate in the control of ET-1 regulation of vascular tone and hemodynamics.
Collapse
|
31
|
Dassanayaka S, Jones SP. O-GlcNAc and the cardiovascular system. Pharmacol Ther 2013; 142:62-71. [PMID: 24287310 DOI: 10.1016/j.pharmthera.2013.11.005] [Citation(s) in RCA: 104] [Impact Index Per Article: 9.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/21/2013] [Accepted: 11/01/2013] [Indexed: 12/28/2022]
Abstract
The cardiovascular system is capable of robust changes in response to physiologic and pathologic stimuli through intricate signaling mechanisms. The area of metabolism has witnessed a veritable renaissance in the cardiovascular system. In particular, the post-translational β-O-linkage of N-acetylglucosamine (O-GlcNAc) to cellular proteins represents one such signaling pathway that has been implicated in the pathophysiology of cardiovascular disease. This highly dynamic protein modification may induce functional changes in proteins and regulate key cellular processes including translation, transcription, and cell death. In addition, its potential interplay with phosphorylation provides an additional layer of complexity to post-translational regulation. The hexosamine biosynthetic pathway generally requires glucose to form the nucleotide sugar, UDP-GlcNAc. Accordingly, O-GlcNAcylation may be altered in response to nutrient availability and cellular stress. Recent literature supports O-GlcNAcylation as an autoprotective response in models of acute stress (hypoxia, ischemia, oxidative stress). Models of sustained stress, such as pressure overload hypertrophy, and infarct-induced heart failure, may also require protein O-GlcNAcylation as a partial compensatory mechanism. Yet, in models of Type II diabetes, O-GlcNAcylation has been implicated in the subsequent development of vascular, and even cardiac, dysfunction. This review will address this apparent paradox and discuss the potential mechanisms of O-GlcNAc-mediated cardioprotection and cardiovascular dysfunction. This discussion will also address potential targets for pharmacologic interventions and the unique considerations related to such targets.
Collapse
Affiliation(s)
- Sujith Dassanayaka
- Institute of Molecular Cardiology, Diabetes and Obesity Center, Division of Cardiovascular Medicine, Department of Medicine, University of Louisville, Louisville, KY, USA; Department of Physiology and Biophysics, University of Louisville, Louisville, KY, USA
| | - Steven P Jones
- Institute of Molecular Cardiology, Diabetes and Obesity Center, Division of Cardiovascular Medicine, Department of Medicine, University of Louisville, Louisville, KY, USA; Department of Physiology and Biophysics, University of Louisville, Louisville, KY, USA.
| |
Collapse
|
32
|
Li Y, Liu H, Xu QS, Du YG, Xu J. Chitosan oligosaccharides block LPS-induced O-GlcNAcylation of NF-κB and endothelial inflammatory response. Carbohydr Polym 2013; 99:568-78. [PMID: 24274545 DOI: 10.1016/j.carbpol.2013.08.082] [Citation(s) in RCA: 65] [Impact Index Per Article: 5.9] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/22/2013] [Revised: 08/23/2013] [Accepted: 08/24/2013] [Indexed: 02/06/2023]
Abstract
It is known that chitosan oligosaccharides (COS) suppress LPS-induced vascular endothelial inflammatory response by mechanism involving NF-κB blockade. It remains unknown how COS inhibit NF-κB. We provided evidence both in cultured endothelial cells and mouse model supporting a new mechanism. Regardless of the endothelial cell types, the LPS-induced NF-κB-dependent inflammatory gene expression was suppressed by COS, which was associated with reduced NF-κB nucleus translocation. LPS enhanced O-GlcNAc modification of NF-κB/p65 and activated NF-κB pathway, which could be prevented either by siRNA knockdown of O-GlcNAc transferase (OGT) or pretreatment with COS. Inhibition of either mitogen-activated protein kinase or superoxide generation abolishes LPS-induced NF-κB O-GlcNAcylation. Consistently, aortic tissues from LPS-treated mice presented enhanced NF-κB/p65 O-GlcNAcylation in association with upregulated gene expression of inflammatory cytokines in vascular tissues; however, pre-administration of COS prevented these responses. In conclusion, COS decreased OGT-dependent O-GlcNAcylation of NF-κB and thereby attenuated LPS-induced vascular endothelial inflammatory response.
Collapse
Affiliation(s)
- Yu Li
- Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023, China; University of Chinese Academy of Sciences, Beijing 100049, China; Department of Medicine, University of Oklahoma Health Sciences Center, 941 Stanton L. Young Boulevard, Oklahoma City, OK 73104, USA
| | | | | | | | | |
Collapse
|
33
|
Contreras C, Sánchez A, Martínez P, Climent B, Benedito S, García-Sacristán A, Hernández M, Prieto D. Impaired Endothelin Calcium Signaling Coupled to Endothelin Type B Receptors in Penile Arteries from Insulin-Resistant Obese Zucker Rats. J Sex Med 2013; 10:2141-53. [DOI: 10.1111/jsm.12234] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/18/2023]
|
34
|
Affiliation(s)
- Yohann Rautureau
- Yohann Rautureau is a Research Associate in the laboratory of Ernesto Schiffrin at the Lady Davis Institute for Medical Research, Jewish General Hospital, McGill University (Montreal, Canada). His research deals with vascular remodeling, the role of endothelin, and the intracellular signaling of angiotensin II and aldosterone
| | - Ernesto L Schiffrin
- Ernesto L Schiffrin is Physician-in-Chief, Jewish General Hospital, Canada Research Chair in Hypertension and Vascular Research, Lady Davis Institute for Medical Research, and Professor and Vice-Chair (Research), Department of Medicine, McGill University. His research deals with vascular remodeling in hypertension, renal and cardiometabolic diseases, from mice to humans, and the influence of the renin–angiotensin–aldosterone and endothelin systems, nuclear receptors and immunity on blood vessels
| |
Collapse
|
35
|
Itkonen HM, Minner S, Guldvik IJ, Sandmann MJ, Tsourlakis MC, Berge V, Svindland A, Schlomm T, Mills IG. O-GlcNAc transferase integrates metabolic pathways to regulate the stability of c-MYC in human prostate cancer cells. Cancer Res 2013; 73:5277-87. [PMID: 23720054 DOI: 10.1158/0008-5472.can-13-0549] [Citation(s) in RCA: 212] [Impact Index Per Article: 19.3] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
Metabolic disruptions that occur widely in cancers offer an attractive focus for generalized treatment strategies. The hexosamine biosynthetic pathway (HBP) senses metabolic status and produces an essential substrate for O-linked β-N-acetylglucosamine transferase (OGT), which glycosylates and thereby modulates the function of its target proteins. Here, we report that the HBP is activated in prostate cancer cells and that OGT is a central regulator of c-Myc stability in this setting. HBP genes were overexpressed in human prostate cancers and androgen regulated in cultured human cancer cell lines. Immunohistochemical analysis of human specimens (n = 1987) established that OGT is upregulated at the protein level and that its expression correlates with high Gleason score, pT and pN stages, and biochemical recurrence. RNA interference-mediated siliencing or pharmacologic inhibition of OGT was sufficient to decrease prostate cancer cell growth. Microarray profiling showed that the principal effects of OGT inhibition in prostate cancer cells were related to cell-cycle progression and DNA replication. In particular, c-MYC was identified as a candidate upstream regulator of OGT target genes and OGT inhibition elicited a dose-dependent decrease in the levels of c-MYC protein but not c-MYC mRNA in cell lines. Supporting this relationship, expression of c-MYC and OGT was tightly correlated in human prostate cancer samples (n = 1306). Our findings identify HBP as a modulator of prostate cancer growth and c-MYC as a key target of OGT function in prostate cancer cells.
Collapse
Affiliation(s)
- Harri M Itkonen
- Prostate Research Group, Centre for Molecular Medicine Norway, Nordic EMBL Partnership, University of Oslo and Oslo University Hospital, Oslo, Norway
| | | | | | | | | | | | | | | | | |
Collapse
|
36
|
Li W, Prakash R, Chawla D, Du W, Didion SP, Filosa JA, Zhang Q, Brann DW, Lima VV, Tostes RC, Ergul A. Early effects of high-fat diet on neurovascular function and focal ischemic brain injury. Am J Physiol Regul Integr Comp Physiol 2013; 304:R1001-8. [PMID: 23576615 DOI: 10.1152/ajpregu.00523.2012] [Citation(s) in RCA: 72] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/17/2023]
Abstract
Obesity is a risk factor for stroke, but the early effects of high-fat diet (HFD) on neurovascular function and ischemic stroke outcomes remain unclear. The goal of this study was to test the hypotheses that HFD beginning early in life 1) impairs neurovascular coupling, 2) causes cerebrovascular dysfunction, and 3) worsens short-term outcomes after cerebral ischemia. Functional hyperemia and parenchymal arteriole (PA) reactivity were measured in rats after 8 wk of HFD. The effect of HFD on basilar artery function after middle cerebral artery occlusion (MCAO) and associated O-GlcNAcylation were assessed. Neuronal cell death, infarct size, hemorrhagic transformation (HT) frequency/severity, and neurological deficit were evaluated after global ischemia and transient MCAO. HFD caused a 10% increase in body weight and doubled adiposity without a change in lipid profile, blood glucose, and blood pressure. Functional hyperemia and PA relaxation were decreased with HFD. Basilar arteries from stroked HFD rats were more sensitive to contractile factors, and acetylcholine-mediated relaxation was impaired. Vascular O-GlcNAcylated protein content was increased with HFD. This group also showed greater mortality rate, infarct volume, HT occurrence rate, and HT severity and poor functional outcome compared with the control diet group. These results indicate that HFD negatively affects neurovascular coupling and cerebrovascular function even in the absence of dyslipidemia. These early cerebrovascular changes may be the cause of greater cerebral injury and poor outcomes of stroke in these animals.
Collapse
Affiliation(s)
- Weiguo Li
- Charlie Norwood Department of Veterans Affairs Medical Center, Augusta, GA, USA
| | | | | | | | | | | | | | | | | | | | | |
Collapse
|
37
|
O-GlcNAcylation and oxidation of proteins: is signalling in the cardiovascular system becoming sweeter? Clin Sci (Lond) 2012; 123:473-86. [PMID: 22757958 PMCID: PMC3389386 DOI: 10.1042/cs20110638] [Citation(s) in RCA: 40] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
Abstract
O-GlcNAcylation is an unusual form of protein glycosylation, where a single-sugar [GlcNAc (N-acetylglucosamine)] is added (via β-attachment) to the hydroxyl moiety of serine and threonine residues of nuclear and cytoplasmic proteins. A complex and extensive interplay exists between O-GlcNAcylation and phosphorylation. Many phosphorylation sites are also known glycosylation sites, and this reciprocal occupancy may produce different activities or alter the stability in a target protein. The interplay between these two post-translational modifications is not always reciprocal, as some proteins can be concomitantly phosphorylated and O-GlcNAcylated, and the adjacent phosphorylation or O-GlcNAcylation can regulate the addition of either moiety. Increased cardiovascular production of ROS (reactive oxygen species), termed oxidative stress, has been consistently reported in various chronic diseases and in conditions where O-GlcNAcylation has been implicated as a contributing mechanism for the associated organ injury/protection (for example, diabetes, Alzheimer's disease, arterial hypertension, aging and ischaemia). In the present review, we will briefly comment on general aspects of O-GlcNAcylation and provide an overview of what has been reported for this post-translational modification in the cardiovascular system. We will then specifically address whether signalling molecules involved in redox signalling can be modified by O-GlcNAc (O-linked GlcNAc) and will discuss the critical interplay between O-GlcNAcylation and ROS generation. Experimental evidence indicates that the interactions between O-GlcNAcylation and oxidation of proteins are important not only for cell regulation in physiological conditions, but also under pathological states where the interplay may become dysfunctional and thereby exacerbate cellular injury.
Collapse
|
38
|
Medford HM, Chatham JC, Marsh SA. Chronic ingestion of a Western diet increases O-linked-β-N-acetylglucosamine (O-GlcNAc) protein modification in the rat heart. Life Sci 2012; 90:883-8. [PMID: 22575823 DOI: 10.1016/j.lfs.2012.04.030] [Citation(s) in RCA: 39] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/12/2011] [Revised: 03/15/2012] [Accepted: 04/11/2012] [Indexed: 12/19/2022]
Abstract
AIMS Protein O-GlcNAcylation is both a nutrient sensing and cellular stress response that mediates signal transduction in the heart. Chronically elevated O-GlcNAc has been associated with the development of cardiac dysfunction at both the cellular and organ levels in obesity, insulin resistance and diabetes. Development of these pathologies is often attributed to diets high in saturated fat and sugar (a "Western" diet; WES) but a role for O-GlcNAc in diet-induced cardiac dysfunction has not been established. The aims of this study were to examine the effect of chronic consumption of WES on cardiac O-GlcNAcylation and investigate associations of O-GlcNAc with cardiac function and markers of cellular stress. MAIN METHODS Young male rats received either a control diet (CON; n=9) or WES (n=8) diet for 52 weeks. KEY FINDINGS There was no evidence of cardiac dysfunction, advanced glycation endproduct (AGE) accumulation, pathological cardiac hypertrophy, calcium handling impairment, fibrosis or endoplasmic reticulum stress in WES hearts. However, cardiac O-GlcNAc protein, particularly in the higher molecular weight range, was significantly higher in WES hearts compared to CON (P<0.05). Protein levels of the enzymes that regulate O-GlcNAc attachment were not different between groups; thus, the increased O-GlcNAcylation in WES hearts appears to be due to increased nutrient availability rather than enzymatic regulation of cellular stress. SIGNIFICANCE These data suggest that diets high in saturated fat and sugar may contribute to the adverse effects of metabolic syndrome and diabetes by an O-GlcNAc-mediated process and that this may occur in the absence of overt cellular stress.
Collapse
Affiliation(s)
- H M Medford
- Program in Nutrition and Exercise Physiology, Washington State University, Spokane, WA 99210-1495, USA
| | | | | |
Collapse
|
39
|
Abstract
INTRODUCTION Pulmonary arterial hypertension (PAH) is a rare disease with a complex pathogenesis. It is often associated with an increased vascular resistance, whilst in the more advanced stages there is a remodelling of the vascular walls. PAH has an intricate involvement of various signaling pathways, including the ras homolog family member A (RhoA)-Rho kinase (ROCK) axis. Currently, available therapies are not always able to significantly slow PAH progression. Therefore, newer approaches are needed. AREAS COVERED In this review, areas covered include the role of the RhoA/ROCK in PAH pathogenesis and the plausibility of its therapeutic targeting. Furthermore, various inhibitory compounds are discussed, including Fasudil and SB-772077-B. EXPERT OPINION Currently, specific RhoA/ROCK inhibition is the most promising therapeutic approach for PAH. Research has shown that it suppresses both the components of this axis and the upstream upregulating mediators. An inhaled RhoA/ROCK inhibitor may be a successful future therapy; however, further clinical trials are needed to support this approach.
Collapse
Affiliation(s)
- Sabina Antonela Antoniu
- 'Gr T Popa' University of Medicine and Pharmacy Iaşi, Pulmonary Disease University Hospital, Department of Medicine II -Pulmonary Disease, Romania.
| |
Collapse
|
40
|
|
41
|
Darley-Usmar VM, Ball LE, Chatham JC. Protein O-linked β-N-acetylglucosamine: a novel effector of cardiomyocyte metabolism and function. J Mol Cell Cardiol 2012; 52:538-49. [PMID: 21878340 PMCID: PMC3928598 DOI: 10.1016/j.yjmcc.2011.08.009] [Citation(s) in RCA: 85] [Impact Index Per Article: 7.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/05/2011] [Revised: 08/11/2011] [Accepted: 08/12/2011] [Indexed: 01/10/2023]
Abstract
The post-translational modification of serine and threonine residues of nuclear and cytoplasmic proteins by the O-linked attachment of the monosaccharide β-N-acetyl-glucosamine (O-GlcNAc) is emerging as an important mechanism for the regulation of numerous biological processes critical for normal cell function. Active synthesis of O-GlcNAc is essential for cell viability and acute activation of pathways resulting in increased protein O-GlcNAc levels improves the tolerance of cells to a wide range of stress stimuli. Conversely sustained increases in O-GlcNAc levels have been implicated in numerous chronic disease states, especially as a pathogenic contributor to diabetic complications. There has been increasing interest in the role of O-GlcNAc in the heart and vascular system and acute activation of O-GlcNAc levels have been shown to reduce ischemia/reperfusion injury, attenuate vascular injury responses as well mediate some of the detrimental effects of diabetes and hypertension on cardiac and vascular function. Here we provide an overview of our current understanding of pathways regulating protein O-GlcNAcylation, summarize the different methodologies for identifying and characterizing O-GlcNAcylated proteins and subsequently focus on two emerging areas: 1) the role of O-GlcNAc as a potential regulator of cardiac metabolism and 2) the cross talk between O-GlcNAc and reactive oxygen species. This article is part of a Special Section entitled "Post-translational Modification."
Collapse
Affiliation(s)
- Victor M. Darley-Usmar
- Division of Molecular and Cellular Pathology, Department of Pathology, University of Alabama at Birmingham, Birmingham, AL
| | - Lauren E. Ball
- Cell and Molecular Pharmacology, Medical University of South Carolina, Charleston, SC
| | - John C. Chatham
- Division of Molecular and Cellular Pathology, Department of Pathology, University of Alabama at Birmingham, Birmingham, AL
| |
Collapse
|
42
|
Goldberg H, Whiteside C, Fantus IG. O-linked β-N-acetylglucosamine supports p38 MAPK activation by high glucose in glomerular mesangial cells. Am J Physiol Endocrinol Metab 2011; 301:E713-26. [PMID: 21712532 DOI: 10.1152/ajpendo.00108.2011] [Citation(s) in RCA: 67] [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: 01/27/2023]
Abstract
Hyperglycemia augments flux through the hexosamine biosynthetic pathway and subsequent O-linkage of single β-N-acetyl-d-glucosamine moieties to serine and threonine residues on cytoplasmic and nuclear proteins (O-GlcNAcylation). Perturbations in this posttranslational modification have been proposed to promote glomerular matrix accumulation in diabetic nephropathy, but clear evidence and mechanism are lacking. We tested the hypothesis that O-GlcNAcylation enhances profibrotic signaling in rat mesangial cells. An adenovirus expressing shRNA directed against O-GlcNAc transferase (OGT) markedly reduced basal and high-glucose-stimulated O-GlcNAcylation. Interestingly, O-GlcNAc depletion prevented high-glucose-induced p38 mitogen-activated protein kinase (MAPK) and c-Jun NH(2)-terminal kinase phosphorylation. Downstream of p38, O-GlcNAc controlled the expression of plasminogen activator inhibitor-1, fibronectin, and transforming growth factor-β, important factors in matrix accumulation in diabetic nephropathy. Treating mesangial cells with thiamet-G, a highly selective inhibitor of O-GlcNAc-specific hexosaminidase (O-GlcNAcase), increased O-GlcNAcylation and p38 phosphorylation. The high-glucose-stimulated kinase activity of apoptosis signal-regulating kinase 1 (ASK1), an upstream MAPK kinase kinase for p38 that is negatively regulated by Akt, was inhibited by OGT shRNA. Akt Thr(308) and Ser(473) phosphorylation were enhanced following OGT shRNA expression in high-glucose-exposed mesangial cells, but high-glucose-induced p38 phosphorylation was not attenuated by OGT shRNA in cells pretreated with the phosphatidylinositol 3-kinase inhibitor LY-294002. OGT shRNA also reduced high-glucose-stimulated reactive oxygen species (ROS) formation. In contrast, diminished O-GlcNAcylation caused elevated ERK phosphorylation and PKCδ membrane translocation. Thus, O-GlcNAcylation is coupled to profibrotic p38 MAPK signaling by high glucose in part through Akt and possibly through ROS.
Collapse
Affiliation(s)
- Howard Goldberg
- Department of Medicine, Samuel Lunenfeld Research Institute, Mount Sinai Hospital, Toronto, ON, Canada
| | | | | |
Collapse
|
43
|
Marsh SA, Chatham JC. The paradoxical world of protein O-GlcNAcylation: a novel effector of cardiovascular (dys)function. Cardiovasc Res 2010; 89:487-8. [PMID: 21177335 DOI: 10.1093/cvr/cvq405] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/27/2023] Open
|