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Ramasamy R, Baker DS, Lemtiri-Chlieh F, Rosenberg DA, Woon E, Al-Naggar IM, Hardy CC, Levine ES, Kuchel GA, Bartley JM, Smith PP. Loss of resilience contributes to detrusor underactivity in advanced age. Biogerontology 2023; 24:163-181. [PMID: 36626035 PMCID: PMC10006334 DOI: 10.1007/s10522-022-10005-y] [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: 11/02/2022] [Accepted: 12/13/2022] [Indexed: 01/11/2023]
Abstract
Volume hyposensitivity resulting from impaired sympathetic detrusor relaxation during bladder filling contributes to detrusor underactivity (DU) associated with aging. Detrusor tension regulation provides an adaptive sensory input of bladder volume to the brainstem and is challenged by physiological stressors superimposed upon biological aging. We recently showed that HCN channels have a stabilizing role in detrusor sympathetic relaxation. While mature mice maintain homeostasis in the face of stressors, old mice are not always capable. In old mice, there is a dichotomous phenotype, in which resilient mice adapt and maintain homeostasis, while non-resilient mice fail to maintain physiologic homeostasis. In this DU model, we used cystometry as a stressor to categorize mice as old-responders (old-R, develop a filling/voiding cycle) or old-non-responders (old-NR, fail to develop a filling/voiding cycle; fluctuating high pressures and continuous leaking), while also assessing functional and molecular differences. Lamotrigine (HCN activator)-induced bladder relaxation is diminished in old-NR mice following HCN-blockade. Relaxation responses to NS 1619 were reduced in old-NR mice, with the effect lost following HCN-blockade. However, RNA-sequencing revealed no differences in HCN gene expression and electrophysiology studies showed similar percentage of detrusor myocytes expressing HCN (Ih) current between old-R and old-NR mice. Our murine model of DU further defines a role for HCN, with failure of adaptive recalibration of HCN participation and intensity of HCN-mediated stabilization, while genomic studies show upregulated myofibroblast and fibrosis pathways and downregulated neurotransmitter-degradation pathways in old-NR mice. Thus, the DU phenotype is multifactorial and represents the accumulation of age-associated loss in homeostatic mechanisms.
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Affiliation(s)
- Ramalakshmi Ramasamy
- UConn Center on Aging, UConn Health, 263 Farmington Avenue, Farmington, CT, 06030-8073, USA
- Connecticut Institute for the Brain and Cognitive Sciences, University of Connecticut, Storrs, CT, USA
- Department of Neuroscience, University of Connecticut School of Medicine, Farmington, CT, USA
| | - Dylan S Baker
- UConn Center on Aging, UConn Health, 263 Farmington Avenue, Farmington, CT, 06030-8073, USA
- Department of Genetics and Genome Sciences, Institute for Systems Genomics, University of Connecticut School of Medicine, Farmington, CT, USA
- The Jackson Laboratory for Genomic Medicine, Farmington, CT, USA
| | - Fouad Lemtiri-Chlieh
- UConn Center on Aging, UConn Health, 263 Farmington Avenue, Farmington, CT, 06030-8073, USA
- Department of Neuroscience, University of Connecticut School of Medicine, Farmington, CT, USA
| | - Dawn A Rosenberg
- UConn Center on Aging, UConn Health, 263 Farmington Avenue, Farmington, CT, 06030-8073, USA
- Department of Cell Biology, University of Connecticut School of Medicine, Farmington, CT, USA
| | - Eric Woon
- UConn Center on Aging, UConn Health, 263 Farmington Avenue, Farmington, CT, 06030-8073, USA
- Department of Biomedical Engineering, University of Connecticut, Storrs, CT, USA
| | - Iman M Al-Naggar
- UConn Center on Aging, UConn Health, 263 Farmington Avenue, Farmington, CT, 06030-8073, USA
- Department of Cell Biology, University of Connecticut School of Medicine, Farmington, CT, USA
| | - Cara C Hardy
- UConn Center on Aging, UConn Health, 263 Farmington Avenue, Farmington, CT, 06030-8073, USA
- Connecticut Institute for the Brain and Cognitive Sciences, University of Connecticut, Storrs, CT, USA
- Department of Neuroscience, University of Connecticut School of Medicine, Farmington, CT, USA
| | - Eric S Levine
- Department of Neuroscience, University of Connecticut School of Medicine, Farmington, CT, USA
| | - George A Kuchel
- UConn Center on Aging, UConn Health, 263 Farmington Avenue, Farmington, CT, 06030-8073, USA
| | - Jenna M Bartley
- UConn Center on Aging, UConn Health, 263 Farmington Avenue, Farmington, CT, 06030-8073, USA.
- Department of Immunology, University of Connecticut School of Medicine, Farmington, CT, USA.
| | - Phillip P Smith
- UConn Center on Aging, UConn Health, 263 Farmington Avenue, Farmington, CT, 06030-8073, USA
- Connecticut Institute for the Brain and Cognitive Sciences, University of Connecticut, Storrs, CT, USA
- Department of Surgery, University of Connecticut School of Medicine, Farmington, CT, USA
- Department of Neuroscience, University of Connecticut School of Medicine, Farmington, CT, USA
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2
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Verde C, Giordano D, Bruno S. NO and Heme Proteins: Cross-Talk between Heme and Cysteine Residues. Antioxidants (Basel) 2023; 12:antiox12020321. [PMID: 36829880 PMCID: PMC9952723 DOI: 10.3390/antiox12020321] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/23/2022] [Revised: 01/19/2023] [Accepted: 01/24/2023] [Indexed: 01/31/2023] Open
Abstract
Heme proteins are a diverse group that includes several unrelated families. Their biological function is mainly associated with the reactivity of the heme group, which-among several other reactions-can bind to and react with nitric oxide (NO) and other nitrogen compounds for their production, scavenging, and transport. The S-nitrosylation of cysteine residues, which also results from the reaction with NO and other nitrogen compounds, is a post-translational modification regulating protein activity, with direct effects on a variety of signaling pathways. Heme proteins are unique in exhibiting this dual reactivity toward NO, with reported examples of cross-reactivity between the heme and cysteine residues within the same protein. In this work, we review the literature on this interplay, with particular emphasis on heme proteins in which heme-dependent nitrosylation has been reported and those for which both heme nitrosylation and S-nitrosylation have been associated with biological functions.
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Affiliation(s)
- Cinzia Verde
- Institute of Biosciences and BioResources (IBBR), National Research Council (CNR), Via Pietro Castellino 111, 80131 Napoli, Italy
- Department of Marine Biotechnology, Stazione Zoologica Anton Dohrn (SZN), Villa Comunale, 80121 Napoli, Italy
| | - Daniela Giordano
- Institute of Biosciences and BioResources (IBBR), National Research Council (CNR), Via Pietro Castellino 111, 80131 Napoli, Italy
- Department of Marine Biotechnology, Stazione Zoologica Anton Dohrn (SZN), Villa Comunale, 80121 Napoli, Italy
| | - Stefano Bruno
- Department of Food and Drug, University of Parma, 43124 Parma, Italy
- Biopharmanet-TEC, University of Parma, 43124 Parma, Italy
- Correspondence:
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3
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Coburn RF. Carbon Monoxide (CO), Nitric Oxide, and Hydrogen Sulfide Signaling During Acute CO Poisoning. Front Pharmacol 2022; 12:830241. [PMID: 35370627 PMCID: PMC8972574 DOI: 10.3389/fphar.2021.830241] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/06/2021] [Accepted: 12/27/2021] [Indexed: 11/13/2022] Open
Abstract
Major toxic effects of acute carbon monoxide (CO) poisoning result from increases in reactive oxygen species (ROS) and reactive nitrogen species (RNS) producing oxidative stress. The importance of altered nitric oxide (NO) signaling in evoking increases in RNS during CO poisoning has been established. Although there is extensive literature describing NO and hydrogen sulfide (H2S) signaling in different types of cells under normal conditions, how CO poisoning-evoked deregulation of additional NO signaling pathways and H2S signaling pathways could result in cell injury has not been previously considered in detail. The goal of this article was to do this. The approach was to use published data to describe signaling pathways driven by CO bonding to different ferroproteins and then to collate data that describe NO and H2S signaling pathways that could interact with CO signaling pathways and be important during CO poisoning. Arteriolar smooth muscle cells—endothelial cells located in the coronary and some cerebral circulations—were used as a model to illustrate major signaling pathways driven by CO bonding to different ferroproteins. The results were consistent with the concept that multiple deregulated and interacting NO and H2S signaling pathways can be involved in producing cell injury evoked during acute CO poisoning and that these pathways interact with CO signaling pathways.
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4
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Keller TCS, Lechauve C, Keller AS, Brooks S, Weiss MJ, Columbus L, Ackerman HC, Cortese-Krott MM, Isakson BE. The role of globins in cardiovascular physiology. Physiol Rev 2021; 102:859-892. [PMID: 34486392 DOI: 10.1152/physrev.00037.2020] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022] Open
Abstract
Globin proteins exist in every cell type of the vasculature, from erythrocytes to endothelial cells, vascular smooth muscle cells, and peripheral nerve cells. Many globin subtypes are also expressed in muscle tissues (including cardiac and skeletal muscle), in other organ-specific cell types, and in cells of the central nervous system. The ability of each of these globins to interact with molecular oxygen (O2) and nitric oxide (NO) is preserved across these contexts. Endothelial α-globin is an example of extra-erythrocytic globin expression. Other globins, including myoglobin, cytoglobin, and neuroglobin are observed in other vascular tissues. Myoglobin is observed primarily in skeletal muscle and smooth muscle cells surrounding the aorta or other large arteries. Cytoglobin is found in vascular smooth muscle but can also be expressed in non-vascular cell types, especially in oxidative stress conditions after ischemic insult. Neuroglobin was first observed in neuronal cells, and its expression appears to be restricted mainly to the central and peripheral nervous systems. Brain and central nervous system neurons expressing neuroglobin are positioned close to many arteries within the brain parenchyma and can control smooth muscle contraction and, thus, tissue perfusion and vascular reactivity. Overall, reactions between NO and globin heme-iron contribute to vascular homeostasis by regulating vasodilatory NO signals and scaveging reactive species in cells of the mammalian vascular system. Here, we discuss how globin proteins affect vascular physiology with a focus on NO biology, and offer perspectives for future study of these functions.
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Affiliation(s)
- T C Steven Keller
- Robert M. Berne Cardiovascular Research Center, University of Virginia School of Medicine, Charlottesville, United States.,Department of Molecular Physiology and Biophysics, University of Virginia School of Medicine, Charlottesville, VA, United States
| | - Christophe Lechauve
- Department of Hematology, St. Jude's Children's Research Hospital, Memphis, TN, United States
| | - Alexander S Keller
- Robert M. Berne Cardiovascular Research Center, University of Virginia School of Medicine, Charlottesville, United States.,Department of Pharmacology, University of Virginia School of Medicine, Charlottesville, VA, United States
| | - Steven Brooks
- Physiology Unit, Laboratory of Malaria and Vector Research, National Institute of Allergy and Infectious Diseases, Rockville, MD, United States
| | - Mitchell J Weiss
- Department of Hematology, St. Jude's Children's Research Hospital, Memphis, TN, United States
| | - Linda Columbus
- Department of Chemistry, University of Virginia, Charlottesville, VA, United States
| | - Hans C Ackerman
- Physiology Unit, Laboratory of Malaria and Vector Research, National Institute of Allergy and Infectious Diseases, Rockville, MD, United States
| | - Miriam M Cortese-Krott
- Myocardial Infarction Research Laboratory, Department of Cardiology, Pulmunology, and Angiology, Medical Faculty, Heinrich-Heine-University of Düsseldorf, Düsseldorf, Germany.,Department of Physiology and Pharmacology, Karolinska Institutet, Stockholm, Sweden
| | - Brant E Isakson
- Robert M. Berne Cardiovascular Research Center, University of Virginia School of Medicine, Charlottesville, United States.,Department of Molecular Physiology and Biophysics, University of Virginia School of Medicine, Charlottesville, VA, United States
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5
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Helfenrath K, Sauer M, Kamga M, Wisniewsky M, Burmester T, Fabrizius A. The More, the Merrier? Multiple Myoglobin Genes in Fish Species, Especially in Gray Bichir (Polypterus senegalus) and Reedfish (Erpetoichthys calabaricus). Genome Biol Evol 2021; 13:6237895. [PMID: 33871590 PMCID: PMC8480196 DOI: 10.1093/gbe/evab078] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 04/09/2021] [Indexed: 12/30/2022] Open
Abstract
The members of the globin superfamily are a classical model system to investigate gene evolution and their fates as well as the diversity of protein function. One of the best-known globins is myoglobin (Mb), which is mainly expressed in heart muscle and transports oxygen from the sarcolemma to the mitochondria. Most vertebrates harbor a single copy of the myoglobin gene, but some fish species have multiple myoglobin genes. Phylogenetic analyses indicate an independent emergence of multiple myoglobin genes, whereby the origin is mostly the last common ancestor of each order. By analyzing different transcriptome data sets, we found at least 15 multiple myoglobin genes in the polypterid gray bichir (Polypterus senegalus) and reedfish (Erpetoichthys calabaricus). In reedfish, the myoglobin genes are expressed in a broad range of tissues but show very different expression values. In contrast, the Mb genes of the gray bichir show a rather scattered expression pattern; only a few Mb genes were found expressed in the analyzed tissues. Both, gray bichir and reedfish possess lungs which enable them to inhabit shallow and swampy waters throughout tropical Africa with frequently fluctuating and low oxygen concentrations. The myoglobin repertoire probably reflects the molecular adaptation to these conditions. The sequence divergence, the substitution rate, and the different expression pattern of multiple myoglobin genes in gray bichir and reedfish imply different functions, probably through sub- and neofunctionalization during evolution.
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Affiliation(s)
| | - Markus Sauer
- Institute of Zoology, Biocenter Grindel, University
of Hamburg, Germany
| | - Michelle Kamga
- Institute of Zoology, Biocenter Grindel, University
of Hamburg, Germany
- Teaching Hospital Cologne, University
of Cologne, Cologne, Germany
| | | | | | - Andrej Fabrizius
- Institute of Zoology, Biocenter Grindel, University
of Hamburg, Germany
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6
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Park JW, Thomas SM, Schechter AN, Piknova B. Control of rat muscle nitrate levels after perturbation of steady state dietary nitrate intake. Nitric Oxide 2021; 109-110:42-49. [PMID: 33713800 PMCID: PMC8020733 DOI: 10.1016/j.niox.2021.03.003] [Citation(s) in RCA: 16] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/21/2020] [Revised: 03/02/2021] [Accepted: 03/05/2021] [Indexed: 12/17/2022]
Abstract
The roles of nitrate and nitrite ions as nitric oxide (NO) sources in mammals, complementing NOS enzymes, have recently been the focus of much research. We previously reported that rat skeletal muscle serves as a nitrate reservoir, with the amount of stored nitrate being highly dependent on dietary nitrate availability, as well as its synthesis by NOS1 enzymes and its subsequent utilization. We showed that at conditions of increased NO need, this nitrate reservoir is used in situ to generate nitrite and NO, at least in part via the nitrate reductase activity of xanthine oxidoreductase (XOR). We now further investigate the dynamics of nitrate/nitrite fluxes in rat skeletal muscle after first increasing nitrate levels in drinking water and then returning to the original intake level. Nitrate/nitrite levels were analyzed in liver, blood and several skeletal muscle samples, and expression of proteins involved in nitrate metabolism and transport were also measured. Increased nitrate supply elevated nitrate and nitrite levels in all measured tissues. Surprisingly, after high nitrate diet termination, levels of both ions in liver and all muscle samples first declined to lower levels than the original baseline. During the course of the overall experiment there was a gradual increase of XOR expression in muscle tissue, which likely led to enhanced nitrate to nitrite reduction. We also noted differences in basal levels of nitrate in the different types of muscles. These findings suggest complex control of muscle nitrate levels, perhaps with multiple processes to preserve its intracellular levels.
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Affiliation(s)
- Ji Won Park
- Molecular Medicine Branch, National Institute of Diabetes, Digestive and Kidney Diseases, National Institutes of Health, Bethesda, MD, 20892, USA
| | - Samantha M Thomas
- Molecular Medicine Branch, National Institute of Diabetes, Digestive and Kidney Diseases, National Institutes of Health, Bethesda, MD, 20892, USA
| | - Alan N Schechter
- Molecular Medicine Branch, National Institute of Diabetes, Digestive and Kidney Diseases, National Institutes of Health, Bethesda, MD, 20892, USA
| | - Barbora Piknova
- Molecular Medicine Branch, National Institute of Diabetes, Digestive and Kidney Diseases, National Institutes of Health, Bethesda, MD, 20892, USA.
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7
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Quinting T, Heymann AK, Bicker A, Nauth T, Bernardini A, Hankeln T, Fandrey J, Schreiber T. Myoglobin Protects Breast Cancer Cells Due to Its ROS and NO Scavenging Properties. Front Endocrinol (Lausanne) 2021; 12:732190. [PMID: 34671319 PMCID: PMC8521001 DOI: 10.3389/fendo.2021.732190] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/28/2021] [Accepted: 09/15/2021] [Indexed: 12/19/2022] Open
Abstract
Myoglobin (MB) is an oxygen-binding protein usually found in cardiac myocytes and skeletal muscle fibers. It may function as a temporary storage and transport protein for O2 but could also have scavenging capacity for reactive oxygen and nitrogen species. In addition, MB has recently been identified as a hallmark in luminal breast cancer and was shown to be robustly induced under hypoxia. Cellular responses to hypoxia are regulated by the transcription factor hypoxia-inducible factor (HIF). For exploring the function of MB in breast cancer, we employed the human cell line MDA-MB-468. Cells were grown in monolayer or as 3D multicellular spheroids, which mimic the in vivo avascular tumor architecture and physiology with a heterogeneous cell population of proliferating cells in the rim and non-cycling or necrotic cells in the core region. This central necrosis was increased after MB knockdown, indicating a role for MB in hypoxic tumor regions. In addition, MB knockdown caused higher levels of HIF-1α protein after treatment with NO, which also plays an important role in cancer cell survival. MB knockdown also led to higher reactive oxygen species (ROS) levels in the cells after treatment with H2O2. To further explore the role of MB in cell survival, we performed RNA-Seq after MB knockdown and NO treatment. 1029 differentially expressed genes (DEGs), including 45 potential HIF-1 target genes, were annotated in regulatory pathways that modulate cellular function and maintenance, cell death and survival, and carbohydrate metabolism. Of these target genes, TMEFF1, TREX2, GLUT-1, MKNK-1, and RAB8B were significantly altered. Consistently, a decreased expression of GLUT-1, MKNK-1, and RAB8B after MB knockdown was confirmed by qPCR. All three genes of interest are often up regulated in cancer and correlate with a poor clinical outcome. Thus, our data indicate that myoglobin might influence the survival of breast cancer cells, possibly due to its ROS and NO scavenging properties and could be a valuable target for cancer therapy.
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Affiliation(s)
- Theresa Quinting
- Institute of Physiology, University of Duisburg-Essen, Essen, Germany
| | | | - Anne Bicker
- Institute of Organismic and Molecular Evolution, Molecular Genetics and Genome Analysis, Johannes Gutenberg University, Mainz, Germany
| | - Theresa Nauth
- Institute of Organismic and Molecular Evolution, Molecular Genetics and Genome Analysis, Johannes Gutenberg University, Mainz, Germany
| | - Andre Bernardini
- Institute of Physiology, University of Duisburg-Essen, Essen, Germany
| | - Thomas Hankeln
- Institute of Organismic and Molecular Evolution, Molecular Genetics and Genome Analysis, Johannes Gutenberg University, Mainz, Germany
| | - Joachim Fandrey
- Institute of Physiology, University of Duisburg-Essen, Essen, Germany
- *Correspondence: Joachim Fandrey,
| | - Timm Schreiber
- Institute of Physiology, University of Duisburg-Essen, Essen, Germany
- Institute of Physiology, Pathophysiology and Toxicology and Center for Biomedical Education and Research, University of Witten/Herdecke, Witten, Germany
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8
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Yang M, Dart C, Kamishima T, Quayle JM. Hypoxia and metabolic inhibitors alter the intracellular ATP:ADP ratio and membrane potential in human coronary artery smooth muscle cells. PeerJ 2020; 8:e10344. [PMID: 33240653 PMCID: PMC7664465 DOI: 10.7717/peerj.10344] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/05/2020] [Accepted: 10/20/2020] [Indexed: 11/20/2022] Open
Abstract
ATP-sensitive potassium (KATP) channels couple cellular metabolism to excitability, making them ideal candidate sensors for hypoxic vasodilation. However, it is still unknown whether cellular nucleotide levels are affected sufficiently to activate vascular KATP channels during hypoxia. To address this fundamental issue, we measured changes in the intracellular ATP:ADP ratio using the biosensors Perceval/PercevalHR, and membrane potential using the fluorescent probe DiBAC4(3) in human coronary artery smooth muscle cells (HCASMCs). ATP:ADP ratio was significantly reduced by exposure to hypoxia. Application of metabolic inhibitors for oxidative phosphorylation also reduced ATP:ADP ratio. Hyperpolarization caused by inhibiting oxidative phosphorylation was blocked by either 10 µM glibenclamide or 60 mM K+. Hyperpolarization caused by hypoxia was abolished by 60 mM K+ but not by individual K+ channel inhibitors. Taken together, these results suggest hypoxia causes hyperpolarization in part by modulating K+ channels in SMCs.
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Affiliation(s)
- Mingming Yang
- Department of Cardiology, Zhongda Hospital, Medical School of Southeast University, Nanjing, People's Republic of China.,Department of Cellular and Molecular Physiology, Institute of Translational Medicine, Liverpool, UK
| | - Caroline Dart
- Department of Biochemistry, Institute of Integrative Biology, Liverpool, UK
| | - Tomoko Kamishima
- Department of Cellular and Molecular Physiology, Institute of Translational Medicine, Liverpool, UK
| | - John M Quayle
- Department of Cellular and Molecular Physiology, Institute of Translational Medicine, Liverpool, UK
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9
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Li YW, Chi Q, Feng T, Xiao H, Li L, Wang X. Interactions of indole alkaloids with myoglobin: A mass spectrometry based spectrometric and computational method. RAPID COMMUNICATIONS IN MASS SPECTROMETRY : RCM 2020; 34:e8656. [PMID: 31721336 DOI: 10.1002/rcm.8656] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/14/2019] [Revised: 11/07/2019] [Accepted: 11/08/2019] [Indexed: 06/10/2023]
Abstract
RATIONALE Interactions of drug molecules and proteins play important roles in physiological and pathological processes in vivo. It is of significance to establish a reliable strategy for studying protein-drug ligand interactions and would be helpful for the design and screening of new drugs in pharmacological research. METHODS The interactions between four indole alkaloids (IAs) extracted from Ophiorrhiza japonica (O. japonica) and myoglobin (Mb) protein were investigated using a multi-spectrometric and computational method of native electrospray ionization mass spectrometry (native ESI-MS), hydrogen/deuterium exchange mass spectrometry (HDX-MS), circular dichroism (CD) and molecular docking (MD). RESULTS The IA-bound Mb complexes were analyzed using native ESI-MS, with the obtained protein-to-ligand stoichiometry at 1:1, 1:2 and 1:3. Binding constants were measured according to the interpretation of MS spectra. MD complemented MS measurements, probing the binding sites and modes of the four IAs to Mb. Analyses involving CD and HDX-MS demonstrated that exposure to IAs could affect the conformation of Mb by decreasing the α-helix content and made Mb more susceptible to HDX at the backbone. CONCLUSIONS A new MS-based integrated analysis method has been developed to successfully study the interactions of Mb and IAs extracted from O. japonica. The experimental and calculation results have good consistency, revealing all of the four IA molecules could bind to Mb to form 1:1, 1:2 and 1:3 Mb-IA complexes. The order of binding ability of these IAs to Mb was ophiorrhine B > compound C > ophiorrhine A > compound D. CD and HDX-MS results indicated that binding with IAs destabilizes Mb. HDX-MS analysis suggests that Mb becomes more susceptible to HDX, indicating that binding with IAs destabilizes the structure of Mb. In addition, the interaction with IAs affected the overall structure of Mb, ascribed to the decrease of α-helix content and less folding of the backbone.
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Affiliation(s)
- Ya-Wen Li
- College of Chemistry and Materials Science, South-Central University for Nationalities, 430074, Wuhan, China
| | - Quan Chi
- College of Chemistry and Materials Science, South-Central University for Nationalities, 430074, Wuhan, China
| | - Tao Feng
- School of Pharmaceutical Sciences, South-Central University for Nationalities, 430074, Wuhan, China
| | - Huaming Xiao
- College of Chemistry and Materials Science, South-Central University for Nationalities, 430074, Wuhan, China
| | - Linghe Li
- College of Chemistry and Materials Science, South-Central University for Nationalities, 430074, Wuhan, China
| | - Xian Wang
- College of Chemistry and Materials Science, South-Central University for Nationalities, 430074, Wuhan, China
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10
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Bicker A, Nauth T, Gerst D, Aboouf MA, Fandrey J, Kristiansen G, Gorr TA, Hankeln T. The role of myoglobin in epithelial cancers: Insights from transcriptomics. Int J Mol Med 2019; 45:385-400. [PMID: 31894249 PMCID: PMC6984796 DOI: 10.3892/ijmm.2019.4433] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/08/2019] [Accepted: 11/08/2019] [Indexed: 12/25/2022] Open
Abstract
The muscle-associated respiratory protein myoglobin (MB) is expressed in multiple types of cancer, including breast and prostate tumors. In Kaplan-Meier analyses of the two tumor types, MB positivity is associated with favorable prognoses. Despite its well-characterized function in myocytes, the role of MB in cancer remains unclear. To study the impact of endogenous MB expression, small interfering RNA MB-knockdown cells were engineered using breast, prostate and colon cancer cell lines (MDA-MB468, LNCaP, DLD-1), and their transcriptomes were investigated using RNA-Seq at different oxygen levels. In MB-positive cells, increased expression of glycolytic genes was observed, which was possibly mediated by a higher activity of hypoxia-inducible factor 1α. In addition, the results of the gene set enrichment analysis suggested that MB contributed to fatty acid transport and turnover. MB-positive, wild-type-p53 LNCaP cells also exhibited increased expression of p53 target genes involved in cell cycle checkpoint control and prevention of cell migration. MB-positive cells expressing mutant p53 exhibited upregulation of genes associated with prolonged cancer cell viability and motility. Therefore, it was hypothesized that these transcriptomic differences may result from MB-mediated generation of nitric oxide or reactive oxygen species, thus employing established enzymatic activities of the globin. In summary, the transcriptome comparisons identified potential molecular functions of MB in carcinogenesis by highlighting the interaction of MB with key metabolic and regulatory processes.
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Affiliation(s)
- Anne Bicker
- Institute of Organismic and Molecular Evolution, Molecular Genetics and Genome Analysis, Johannes Gutenberg University, D‑55099 Mainz, Germany
| | - Theresa Nauth
- Institute of Organismic and Molecular Evolution, Molecular Genetics and Genome Analysis, Johannes Gutenberg University, D‑55099 Mainz, Germany
| | - Daniela Gerst
- Institute of Veterinary Physiology, Vetsuisse Faculty, University of Zurich, CH‑8057 Zurich, Switzerland
| | - Mostafa Ahmed Aboouf
- Institute of Veterinary Physiology, Vetsuisse Faculty, University of Zurich, CH‑8057 Zurich, Switzerland
| | - Joachim Fandrey
- Institute of Physiology, University of Duisburg‑Essen, D‑45147 Essen, Germany
| | - Glen Kristiansen
- Institute of Pathology, Center for Integrated Oncology, University Hospital Bonn, University of Bonn, D‑53127 Bonn, Germany
| | - Thomas Alexander Gorr
- Institute of Veterinary Physiology, Vetsuisse Faculty, University of Zurich, CH‑8057 Zurich, Switzerland
| | - Thomas Hankeln
- Institute of Organismic and Molecular Evolution, Molecular Genetics and Genome Analysis, Johannes Gutenberg University, D‑55099 Mainz, Germany
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11
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Hendgen-Cotta UB, Esfeld S, Coman C, Ahrends R, Klein-Hitpass L, Flögel U, Rassaf T, Totzeck M. A novel physiological role for cardiac myoglobin in lipid metabolism. Sci Rep 2017; 7:43219. [PMID: 28230173 PMCID: PMC5322402 DOI: 10.1038/srep43219] [Citation(s) in RCA: 23] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/29/2016] [Accepted: 01/20/2017] [Indexed: 02/06/2023] Open
Abstract
Continuous contractile activity of the heart is essential and the required energy is mostly provided by fatty acid (FA) oxidation. Myocardial lipid accumulation can lead to pathological responses, however the underlying mechanisms remain elusive. The role of myoglobin in dioxygen binding in cardiomyocytes and oxidative skeletal muscle has widely been appreciated. Our recent work established myoglobin as a protector of cardiac function in hypoxia and disease states. We here unravel a novel role of cardiac myoglobin in governing FA metabolism to ensure the physiological energy production through β-oxidation, preventing myocardial lipid accumulation and preserving cardiac functions. In vivo1H magnetic resonance spectroscopy unveils a 3-fold higher deposition of lipids in mouse hearts lacking myoglobin, which was associated with depressed cardiac function compared to wild-type hearts as assessed by echocardiography. Mass spectrometry reveals a marked increase in tissue triglycerides with preferential incorporation of palmitic and oleic acids. Phospholipid levels as well as the metabolome, transcriptome and proteome related to FA metabolism tend to be unaffected by myoglobin ablation. Our results reveal a physiological role of myoglobin in FA metabolism with the lipid accumulation-suppressing effects of myoglobin preventing cardiac lipotoxicity.
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Affiliation(s)
- Ulrike B Hendgen-Cotta
- University Hospital Essen, Medical Faculty, West German Heart and Vascular Center, Department of Cardiology and Department of Angiology, Hufelandstr. 55, 45147 Essen, Germany
| | - Sonja Esfeld
- University Hospital Essen, Medical Faculty, West German Heart and Vascular Center, Department of Cardiology and Department of Angiology, Hufelandstr. 55, 45147 Essen, Germany
| | - Cristina Coman
- Leibniz-Institut für Analytische Wissenschaften-ISAS e.V. Otto-Hahn-Str. 6b, 44227 Dortmund, Germany
| | - Robert Ahrends
- Leibniz-Institut für Analytische Wissenschaften-ISAS e.V. Otto-Hahn-Str. 6b, 44227 Dortmund, Germany
| | - Ludger Klein-Hitpass
- University Hospital Essen, Institute of Cell Biology, Medical Faculty, Virchowstr. 173, 45122 Essen, Germany
| | - Ulrich Flögel
- University Hospital Düsseldorf, Department of Molecular Cardiology, Universitätsstr. 1, 40225 Düsseldorf, Germany
| | - Tienush Rassaf
- University Hospital Essen, Medical Faculty, West German Heart and Vascular Center, Department of Cardiology and Department of Angiology, Hufelandstr. 55, 45147 Essen, Germany
| | - Matthias Totzeck
- University Hospital Essen, Medical Faculty, West German Heart and Vascular Center, Department of Cardiology and Department of Angiology, Hufelandstr. 55, 45147 Essen, Germany
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Kuleva NV, Krasovskaya IE. A new role for myoglobin in cardiac and skeletal muscle function. Biophysics (Nagoya-shi) 2016. [DOI: 10.1134/s000635091605016x] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022] Open
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13
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Bicker A, Brahmer AM, Meller S, Kristiansen G, Gorr TA, Hankeln T. The Distinct Gene Regulatory Network of Myoglobin in Prostate and Breast Cancer. PLoS One 2015; 10:e0142662. [PMID: 26559958 PMCID: PMC4641586 DOI: 10.1371/journal.pone.0142662] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/10/2015] [Accepted: 10/26/2015] [Indexed: 12/31/2022] Open
Abstract
Myoglobin (MB) is not only strongly expressed in myocytes, but also at much lower levels in different cancer entities. 40% of breast tumors are MB-positive, with the globin being co-expressed with markers of tumor hypoxia in a proportion of cases. In breast cancer, MB expression is associated with a positive hormone receptor status and patient prognosis. In prostate cancer, another hormone-dependent cancer type, 53% of tumors were recently shown to express MB. Especially in more aggressive prostate cancer specimen MB expression also correlates with increased patient survival rates. Both findings might be due to tumor-suppressing properties of MB in cancer cells. In contrast to muscle, MB transcription in breast and prostate cancer mainly depends on a novel, alternative promoter site. We show here that its associated transcripts can be upregulated by hypoxia and downregulated by estrogens and androgens in MCF7 breast and LNCaP prostate cancer cells, respectively. Bioinformatic data mining of epigenetic histone marks and experimental verification reveal a hitherto uncharacterized transcriptional network that drives the regulation of the MB gene in cancer cells. We identified candidate hormone-receptor binding elements that may interact with the cancer-associated MB promoter to decrease its activity in breast and prostate cancer cells. Additionally, a regulatory element, 250 kb downstream of the promoter, acts as a hypoxia-inducible site within the transcriptional machinery. Understanding the distinct regulation of MB in tumors will improve unraveling the respiratory protein’s function in the cancer context and may provide new starting points for developing therapeutic strategies.
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Affiliation(s)
- Anne Bicker
- Institute of Molecular Genetics, Johannes Gutenberg University, Mainz, Germany
| | | | | | | | - Thomas A. Gorr
- Institute of Veterinary Physiology, Vetsuisse Faculty, University of Zurich, Zurich, Switzerland
- Regenerative Medicine Program, University and University Hospital Zurich, Zurich, Switzerland
| | - Thomas Hankeln
- Institute of Molecular Genetics, Johannes Gutenberg University, Mainz, Germany
- * E-mail:
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14
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Rix PJ, Vick A, Attkins NJ, Barker GE, Bott AW, Alcorn H, Gladwin MT, Shiva S, Bradley S, Hussaini A, Hoye WL, Parsley EL, Masamune H. Pharmacokinetics, pharmacodynamics, safety, and tolerability of nebulized sodium nitrite (AIR001) following repeat-dose inhalation in healthy subjects. Clin Pharmacokinet 2015; 54:261-72. [PMID: 25421879 PMCID: PMC4335132 DOI: 10.1007/s40262-014-0201-y] [Citation(s) in RCA: 34] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
Abstract
Introduction The efficacy of nebulized sodium nitrite (AIR001) has been demonstrated in animal models of pulmonary arterial hypertension (PAH), but it was not known if inhaled nitrite would be well tolerated in human subjects at exposure levels associated with efficacy in these models. Methods Inhaled nebulized sodium nitrite was assessed in three independent studies in a total of 82 healthy male and female subjects. Study objectives included determination of the maximum tolerated dose (MTD) and dose-limiting toxicity (DLT) under normal and mildly hypoxic conditions, and following co-administration with steady-state sildenafil, assessment of nitrite pharmacokinetics, and evaluation of the fraction exhaled nitric oxide (FENO) and concentrations of iron-nitrosyl hemoglobin (Hb(Fe)-NO) and S-nitrosothiols (R-SNO) as biomarkers of local and systemic NO exposure, respectively. Results Nebulized sodium nitrite was well tolerated following 6 days of every 8 h administration up to 90 mg, producing significant increases in circulating Hb(Fe)-NO, R-SNO, and FENO. Pulmonary absorption of nitrite was rapid and complete, and plasma exposure dose was proportional through the MTD dosage level of 90 mg, without accumulation following repeated inhalation. At higher dosage levels, DLTs were orthostasis (observed at 120 mg) and hypotension with tachycardia (at 176 mg), but venous methemoglobin did not exceed 3.0 % at any time in any subject. Neither the tolerability nor pharmacokinetics of nitrite was impacted by conditions of mild hypoxia, or co-administration with sildenafil, supporting the safe use of inhaled nitrite in the clinical setting of PAH. Conclusion On the basis of these results, nebulized sodium nitrite (AIR001) has been advanced into randomized trials in PAH patients. Electronic supplementary material The online version of this article (doi:10.1007/s40262-014-0201-y) contains supplementary material, which is available to authorized users.
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Affiliation(s)
- Peter J Rix
- Seragon Pharmaceuticals, Inc., 12780 El Camino Real, San Diego, CA, 92130, USA,
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Xin Y, Tang X, Wang H, Lu S, Wang Y, Zhang Y, Chen Q. Functional characterization and expression analysis of myoglobin in high-altitude lizard Phrynocephalus erythrurus. Comp Biochem Physiol B Biochem Mol Biol 2015; 188:31-6. [DOI: 10.1016/j.cbpb.2015.06.004] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/28/2015] [Revised: 06/16/2015] [Accepted: 06/17/2015] [Indexed: 10/23/2022]
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Electron self-exchange in hemoglobins revealed by deutero-hemin substitution. J Inorg Biochem 2015; 150:139-47. [DOI: 10.1016/j.jinorgbio.2015.06.014] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/23/2015] [Revised: 06/11/2015] [Accepted: 06/14/2015] [Indexed: 11/20/2022]
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17
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Rasmussen TL, Ma Y, Park CY, Harriss J, Pierce SA, Dekker JD, Valenzuela N, Srivastava D, Schwartz RJ, Stewart MD, Tucker HO. Smyd1 facilitates heart development by antagonizing oxidative and ER stress responses. PLoS One 2015; 10:e0121765. [PMID: 25803368 PMCID: PMC4372598 DOI: 10.1371/journal.pone.0121765] [Citation(s) in RCA: 41] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/19/2014] [Accepted: 02/18/2015] [Indexed: 12/21/2022] Open
Abstract
Smyd1/Bop is an evolutionary conserved histone methyltransferase previously shown by conventional knockout to be critical for embryonic heart development. To further explore the mechanism(s) in a cell autonomous context, we conditionally ablated Smyd1 in the first and second heart fields of mice using a knock-in (KI) Nkx2.5-cre driver. Robust deletion of floxed-Smyd1 in cardiomyocytes and the outflow tract (OFT) resulted in embryonic lethality at E9.5, truncation of the OFT and right ventricle, and additional defects consistent with impaired expansion and proliferation of the second heart field (SHF). Using a transgenic (Tg) Nkx2.5-cre driver previously shown to not delete in the SHF and OFT, early embryonic lethality was bypassed and both ventricular chambers were formed; however, reduced cardiomyocyte proliferation and other heart defects resulted in later embryonic death at E11.5-12.5. Proliferative impairment prior to both early and mid-gestational lethality was accompanied by dysregulation of transcripts critical for endoplasmic reticulum (ER) stress. Mid-gestational death was also associated with impairment of oxidative stress defense—a phenotype highly similar to the previously characterized knockout of the Smyd1-interacting transcription factor, skNAC. We describe a potential feedback mechanism in which the stress response factor Tribbles3/TRB3, when directly methylated by Smyd1, acts as a co-repressor of Smyd1-mediated transcription. Our findings suggest that Smyd1 is required for maintaining cardiomyocyte proliferation at minimally two different embryonic heart developmental stages, and its loss leads to linked stress responses that signal ensuing lethality.
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Affiliation(s)
- Tara L. Rasmussen
- Molecular Biosciences and Institute for Cellular and Molecular Biology, University of Texas, Austin, Texas, United States of America
| | - Yanlin Ma
- Hainan Provincial Key Laboratory for Human Reproductive Medicine and Genetic Research, Affiliated Hospital of Hainan Medical University, Haikou, Hainan, P.R. China
- Department of Biology and Biochemistry, University of Houston, Houston, Texas, United States of America
| | - Chong Yon Park
- Gladstone Institute of Cardiovascular Disease and Departments of Pediatrics and Biochemistry and Biophysics, University of California, San Francisco, California, United States of America
| | - June Harriss
- Molecular Biosciences and Institute for Cellular and Molecular Biology, University of Texas, Austin, Texas, United States of America
| | - Stephanie A. Pierce
- Gladstone Institute of Cardiovascular Disease and Departments of Pediatrics and Biochemistry and Biophysics, University of California, San Francisco, California, United States of America
| | - Joseph D. Dekker
- Molecular Biosciences and Institute for Cellular and Molecular Biology, University of Texas, Austin, Texas, United States of America
| | - Nicolas Valenzuela
- Department of Biology and Biochemistry, University of Houston, Houston, Texas, United States of America
| | - Deepak Srivastava
- Gladstone Institute of Cardiovascular Disease and Departments of Pediatrics and Biochemistry and Biophysics, University of California, San Francisco, California, United States of America
| | - Robert J. Schwartz
- Department of Biology and Biochemistry, University of Houston, Houston, Texas, United States of America
| | - M. David Stewart
- Department of Biology and Biochemistry, University of Houston, Houston, Texas, United States of America
- * E-mail: (MDS); (HT)
| | - Haley O. Tucker
- Molecular Biosciences and Institute for Cellular and Molecular Biology, University of Texas, Austin, Texas, United States of America
- * E-mail: (MDS); (HT)
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Dietary nitrate is a modifier of vascular gene expression in old male mice. OXIDATIVE MEDICINE AND CELLULAR LONGEVITY 2015; 2015:658264. [PMID: 25838870 PMCID: PMC4369962 DOI: 10.1155/2015/658264] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 12/15/2014] [Accepted: 02/20/2015] [Indexed: 02/07/2023]
Abstract
Aging leads to a number of disadvantageous changes in the cardiovascular system. Deterioration of vascular homoeostasis with increase in oxidative stress, chronic low-grade inflammation, and impaired nitric oxide bioavailability results in endothelial dysfunction, increased vascular stiffness, and compromised arterial-ventricular interactions. A chronic dietary supplementation with the micronutrient nitrate has been demonstrated to improve vascular function. Healthy dietary patterns may regulate gene expression profiles. However, the mechanisms are incompletely understood. The changes that occur at the gene expression level and transcriptional profile following a nutritional modification with nitrate have not been elucidated. To determine the changes of the vascular transcriptome, we conducted gene expression microarray experiments on aortas of old mice, which were treated with dietary nitrate. Our results highlight differentially expressed genes overrepresented in gene ontology categories. Molecular interaction and reaction pathways involved in the calcium-signaling pathway and the detoxification system were identified. Our results provide novel insight to an altered gene-expression profile in old mice following nitrate supplementation. This supports the general notion of nutritional approaches to modulate age-related changes of vascular functions and its detrimental consequences.
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Piknova B, Park JW, Swanson KM, Dey S, Noguchi CT, Schechter AN. Skeletal muscle as an endogenous nitrate reservoir. Nitric Oxide 2015; 47:10-16. [PMID: 25727730 DOI: 10.1016/j.niox.2015.02.145] [Citation(s) in RCA: 72] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/03/2014] [Revised: 02/23/2015] [Accepted: 02/24/2015] [Indexed: 12/11/2022]
Abstract
The nitric oxide synthase (NOS) family of enzymes form nitric oxide (NO) from arginine in the presence of oxygen. At reduced oxygen availability NO is also generated from nitrate in a two step process by bacterial and mammalian molybdopterin proteins, and also directly from nitrite by a variety of five-coordinated ferrous hemoproteins. The mammalian NO cycle also involves direct oxidation of NO to nitrite, and both NO and nitrite to nitrate by oxy-ferrous hemoproteins. The liver and blood are considered the sites of active mammalian NO metabolism and nitrite and nitrate concentrations in the liver and blood of several mammalian species, including human, have been determined. However, the large tissue mass of skeletal muscle had not been generally considered in the analysis of the NO cycle, in spite of its long-known presence of significant levels of active neuronal NOS (nNOS or NOS1). We hypothesized that skeletal muscle participates in the NO cycle and, due to its NO oxidizing heme protein, oxymyoglobin has high concentrations of nitrate ions. We measured nitrite and nitrate concentrations in rat and mouse leg skeletal muscle and found unusually high concentrations of nitrate but similar levels of nitrite, when compared to the liver. The nitrate reservoir in muscle is easily accessible via the bloodstream and therefore nitrate is available for transport to internal organs where it can be reduced to nitrite and NO. Nitrate levels in skeletal muscle and blood in nNOS(-/-) mice were dramatically lower when compared with controls, which support further our hypothesis. Although the nitrate reductase activity of xanthine oxidoreductase in muscle is less than that of liver, the residual activity in muscle could be very important in view of its total mass and the high basal level of nitrate. We suggest that skeletal muscle participates in overall NO metabolism, serving as a nitrate reservoir, for direct formation of nitrite and NO, and for determining levels of nitrate in other organs.
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Affiliation(s)
- Barbora Piknova
- Molecular Medicine Branch, NIDDK, NIH, Bethesda, MD 20892, USA.
| | - Ji Won Park
- Molecular Medicine Branch, NIDDK, NIH, Bethesda, MD 20892, USA
| | | | - Soumyadeep Dey
- Molecular Medicine Branch, NIDDK, NIH, Bethesda, MD 20892, USA
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Development and characterization of an endothelial cell line from the bulbus arteriosus of walleye, Sander vitreus. Comp Biochem Physiol A Mol Integr Physiol 2015; 180:57-67. [DOI: 10.1016/j.cbpa.2014.10.027] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/09/2014] [Revised: 09/29/2014] [Accepted: 10/10/2014] [Indexed: 11/15/2022]
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21
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Hendgen-Cotta UB, Kelm M, Rassaf T. Myoglobin functions in the heart. Free Radic Biol Med 2014; 73:252-9. [PMID: 24859377 DOI: 10.1016/j.freeradbiomed.2014.05.005] [Citation(s) in RCA: 41] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/16/2013] [Revised: 05/01/2014] [Accepted: 05/02/2014] [Indexed: 01/29/2023]
Abstract
The physiological role of myoglobin (Mb) within the heart depends on its oxygenation state. The myocardium exhibits a broad oxygen partial pressure (pO2) spectrum with a transmural gradient from the epicardial to the subendocardial layer, ranging from arterial values to an average of 19.3 mm Hg down to 0 mm Hg. The function of Mb as an O2 storage depot is well appreciated, especially during systolic compression. In addition, Mb controls myocardial nitric oxide (NO) homeostasis and thus modulates mitochondrial respiration under physiological and pathological conditions. We recently discovered the role of Mb as a myocardial O2 sensor; in its oxygenated state Mb scavenges NO, protecting the heart from the deleterious effects of excessive NO. Under hypoxia, however, deoxygenated Mb changes its role from an NO scavenger to an NO producer. The NO produced protects the cell from short phases of hypoxia and from myocardial ischemia/reperfusion injury. In this review we summarize the traditional and novel aspects of Mb and its (patho)physiological role in the heart.
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Affiliation(s)
- Ulrike B Hendgen-Cotta
- University Hospital Düsseldorf, Medical Faculty, Division of Cardiology, Pulmonology, and Vascular Medicine, D-40225 Düsseldorf, Germany
| | - Malte Kelm
- University Hospital Düsseldorf, Medical Faculty, Division of Cardiology, Pulmonology, and Vascular Medicine, D-40225 Düsseldorf, Germany
| | - Tienush Rassaf
- University Hospital Düsseldorf, Medical Faculty, Division of Cardiology, Pulmonology, and Vascular Medicine, D-40225 Düsseldorf, Germany.
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22
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Burmester T, Hankeln T. Function and evolution of vertebrate globins. Acta Physiol (Oxf) 2014; 211:501-14. [PMID: 24811692 DOI: 10.1111/apha.12312] [Citation(s) in RCA: 148] [Impact Index Per Article: 14.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/17/2014] [Revised: 04/17/2014] [Accepted: 04/30/2014] [Indexed: 02/06/2023]
Abstract
Globins are haem-proteins that bind O2 and thus play an important role in the animal's respiration and oxidative energy production. However, globins may also have other functions such as the decomposition or production of NO, the detoxification of reactive oxygen species or intracellular signalling. In addition to the well-investigated haemoglobins and myoglobins, genome sequence analyses have led to the identification of six further globin types in vertebrates: androglobin, cytoglobin, globin E, globin X, globin Y and neuroglobin. Here, we review the present state of knowledge on the functions, the taxonomic distribution and evolution of vertebrate globins, drawing conclusions about the functional changes underlying present-day globin diversity.
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Affiliation(s)
- T. Burmester
- Institute of Zoology and Zoological Museum; University of Hamburg; Hamburg Germany
| | - T. Hankeln
- Institute of Molecular Genetics; Johannes Gutenberg-University Mainz; Mainz Germany
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Bailey JC, Feelisch M, Horowitz JD, Frenneaux MP, Madhani M. Pharmacology and therapeutic role of inorganic nitrite and nitrate in vasodilatation. Pharmacol Ther 2014; 144:303-20. [PMID: 24992304 DOI: 10.1016/j.pharmthera.2014.06.009] [Citation(s) in RCA: 43] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/25/2014] [Accepted: 06/25/2014] [Indexed: 02/07/2023]
Abstract
Nitrite has emerged as an important bioactive molecule that can be biotransformed to nitric oxide (NO) related metabolites in normoxia and reduced to NO under hypoxic and acidic conditions to exert vasodilatory effects and confer a variety of other benefits to the cardiovascular system. Abundant research is currently underway to understand the mechanisms involved and define the role of nitrite in health and disease. In this review we discuss the impact of nitrite and dietary nitrate on vascular function and the potential therapeutic role of nitrite in acute heart failure.
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Affiliation(s)
- J C Bailey
- Centre for Cardiovascular Sciences, College of Medical and Dental Sciences, University of Birmingham, UK
| | - M Feelisch
- Clinical and Experimental Sciences, Faculty of Medicine, University of Southampton, Southampton, UK
| | - J D Horowitz
- The Queen Elizabeth Hospital, Adelaide, Australia
| | - M P Frenneaux
- School of Medicine and Dentistry, University of Aberdeen, Aberdeen, UK
| | - M Madhani
- Centre for Cardiovascular Sciences, College of Medical and Dental Sciences, University of Birmingham, UK.
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Morita S, Furukawa S, Nishi K. Immunohistochemical evaluation of hypoxia markers in the myocardium. AUST J FORENSIC SCI 2014. [DOI: 10.1080/00450618.2014.906653] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
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