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Tejeda-Muñoz N, Azbazdar Y, Sosa EA, Monka J, Wei PS, Binder G, Mei KC, Kurmangaliyev YZ, De Robertis EM. Na, K-ATPase activity promotes macropinocytosis in colon cancer via Wnt signaling. Biol Open 2024; 13:bio060269. [PMID: 38713004 DOI: 10.1242/bio.060269] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/04/2023] [Accepted: 04/18/2024] [Indexed: 05/08/2024] Open
Abstract
Recent research has shown that membrane trafficking plays an important role in canonical Wnt signaling through sequestration of the β-catenin destruction complex inside multivesicular bodies (MVBs) and lysosomes. In this study, we introduce Ouabain, an inhibitor of the Na,K-ATPase pump that establishes electric potentials across membranes, as a potent inhibitor of Wnt signaling. We find that Na,K-ATPase levels are elevated in advanced colon carcinoma, that this enzyme is elevated in cancer cells with constitutively activated Wnt pathway and is activated by GSK3 inhibitors that increase macropinocytosis. Ouabain blocks macropinocytosis, which is an essential step in Wnt signaling, probably explaining the strong effects of Ouabain on this pathway. In Xenopus embryos, brief Ouabain treatment at the 32-cell stage, critical for the earliest Wnt signal in development-inhibited brains, could be reversed by treatment with Lithium chloride, a Wnt mimic. Inhibiting membrane trafficking may provide a way of targeting Wnt-driven cancers.
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Affiliation(s)
- Nydia Tejeda-Muñoz
- Department of Biological Chemistry, David Geffen School of Medicine, University of California, Los Angeles 90095-1662, USA
- Department of Oncology Science, University of Oklahoma Health Sciences Center, Oklahoma City, OK 73104, USA
- OU Health Stephenson Cancer Center, University of Oklahoma Health Sciences Center, Oklahoma City, OK 73104, USA
| | - Yagmur Azbazdar
- Department of Biological Chemistry, David Geffen School of Medicine, University of California, Los Angeles 90095-1662, USA
| | - Eric A Sosa
- Department of Genetics, Albert Einstein College of Medicine, Bronx, NY 10461, USA
| | - Julia Monka
- Department of Biological Chemistry, David Geffen School of Medicine, University of California, Los Angeles 90095-1662, USA
| | - Pu-Sheng Wei
- Department of Pharmaceutical Sciences, School of Pharmacy and Pharmaceutical Sciences, State University of New York at Binghamton, Binghamton, Johnson City, NY 13790, USA
| | - Grace Binder
- Department of Biological Chemistry, David Geffen School of Medicine, University of California, Los Angeles 90095-1662, USA
| | - Kuo-Ching Mei
- Department of Pharmaceutical Sciences, School of Pharmacy and Pharmaceutical Sciences, State University of New York at Binghamton, Binghamton, Johnson City, NY 13790, USA
| | | | - Edward M De Robertis
- Department of Biological Chemistry, David Geffen School of Medicine, University of California, Los Angeles 90095-1662, USA
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2
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Smolyaninova LV, Timoshina YA, Berezhnoy DS, Fedorova TN, Mikheev IV, Seregina IF, Loginova NA, Dobretsov MG. Impact of manganese accumulation on Na, K-ATPase expression and function in the cerebellum and striatum of C57Bl/6 mice. Neurotoxicology 2023; 98:86-97. [PMID: 37598760 DOI: 10.1016/j.neuro.2023.08.002] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/12/2023] [Revised: 08/17/2023] [Accepted: 08/17/2023] [Indexed: 08/22/2023]
Abstract
Overexposure to Mn causes a neurological disorder-manganism-with motor symptoms that overlap closely with disorders associated with haploinsufficiency in the gene encoding for α3 isoform of Na+,K+-ATPase (NKA). The present study was designed to test the hypothesis that behavioral changes in the mouse model of manganism may be associated with changes in the expression and activity of α3 NKA in the cerebellum (CB) and striatum (STR)-the key brain structures responsible for motor control in adult mice. C57Bl/6 mice were exposed to MnCl2 at 0.5 g/L (in drinking water) for up to eight weeks. After four weeks of Mn consumption, Mn levels were increased in the CB only. Behavioral tests demonstrated decreased performance of Mn-treated mice in the shuttle box test (third through sixth weeks), and the inclined grid walking test (first through sixth weeks), suggesting the development of learning impairment, decreased locomotion, and motor discoordination. The activity of NKA significantly decreased, and the expression of α1-α3 isoforms of NKA increased in the second week in the CB only. Thus, signs of learning and motor disturbances developing in this model of manganism are unlikely to be directly linked to disturbances in the expression or activity of NKA in the CB or STR. Whether these early changes may contribute to the pathogenesis of later behavioral deficits remains to be determined.
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Affiliation(s)
- Larisa V Smolyaninova
- Laboratory of Biological Membranes, Faculty of Biology, Lomonosov Moscow State University, 119991 Moscow, Russia.
| | - Yulia A Timoshina
- Department of Higher Nervous Activity, Faculty of Biology, Lomonosov Moscow State University, 119991 Moscow, Russia; Laboratory of Experimental and Translational Neurochemistry, Research Center of Neurology, Volokolamskoe Shosse, 80, Moscow 125367, Russia
| | - Daniil S Berezhnoy
- Department of Higher Nervous Activity, Faculty of Biology, Lomonosov Moscow State University, 119991 Moscow, Russia; Laboratory of Experimental and Translational Neurochemistry, Research Center of Neurology, Volokolamskoe Shosse, 80, Moscow 125367, Russia
| | - Tatiana N Fedorova
- Laboratory of Experimental and Translational Neurochemistry, Research Center of Neurology, Volokolamskoe Shosse, 80, Moscow 125367, Russia
| | - Ivan V Mikheev
- Faculty of Chemistry, Lomonosov Moscow State University, 119991 Moscow, Russia
| | - Irina F Seregina
- Faculty of Chemistry, Lomonosov Moscow State University, 119991 Moscow, Russia
| | - Nadezhda A Loginova
- Research Institute of Higher Nervous Activity and Neurophysiology, Russian Academy of Sciences, 117485 Moscow, Russia
| | - Maxim G Dobretsov
- Institute of Evolutionary Physiology and Biochemistry RAS, 194223 St., Petersburg, Russia.
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Wen XP, Li M, Zhang RQ, Wan QQ. Insulin reverses impaired alveolar fluid clearance in ARDS by inhibiting LPS-induced autophagy and inflammatory. Front Immunol 2023; 14:1162159. [PMID: 37654494 PMCID: PMC10466042 DOI: 10.3389/fimmu.2023.1162159] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/09/2023] [Accepted: 07/24/2023] [Indexed: 09/02/2023] Open
Abstract
Until now, acute respiratory distress syndrome (ARDS) has been a difficult clinical condition with a high mortality and morbidity rate, and is characterized by a build-up of alveolar fluid and impaired clearance. The underlying mechanism is not yet fully understood and no effective medications available. Autophagy activation is associated with ARDS caused by different pathogenic factors. It represents a new direction of prevention and treatment of ARDS to restrain autophagy to a reasonable level through pharmacological and molecular genetic methods. Na, K-ATPase is the main gradient driver of pulmonary water clearance in ARDS and could be degraded by the autophagy-lysosome pathway to affect its abundance and enzyme activity. As a normal growth hormone in human body, insulin has been widely used in clinical for a long time. To investigate the association of insulin with Na, K-ATPase, autophagy and inflammatory markers in LPS-treated C57BL/6 mice by survival assessment, proteomic analysis, histologic examination, inflammatory cell counting, myeloperoxidase, TNF-α and IL-1β activity analysis etc. This was also verified on mouse alveolar epithelial type II (AT II) and A549 cells by transmission electron microscopy. We found that insulin restored the expression of Na, K-ATPase, inhibited the activation of autophagy and reduced the release of inflammatory factors caused by alveolar epithelial damage. The regulation mechanism of insulin on Na, K-ATPase by inhibiting autophagy function may provide new drug targets for the treatment of ARDS.
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Affiliation(s)
- Xu-peng Wen
- Transplantation Center, the Third Xiangya Hospital, Central South University, Changsha, Hunan, China
- Department of Critical Care Medicine, Zhongshan Hospital, Fudan University, Shanghai, China
| | - Min Li
- Department of Anatomy and Neurobiology, School of Basic Medical Sciences, Central South University, Changsha, Hunan, China
| | - Ru-qi Zhang
- Department of Anatomy and Neurobiology, School of Basic Medical Sciences, Central South University, Changsha, Hunan, China
| | - Qi-quan Wan
- Transplantation Center, the Third Xiangya Hospital, Central South University, Changsha, Hunan, China
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4
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Shahnazari M, Zakipour Z, Razi H, Moghadam A, Alemzadeh A. Bioinformatics approaches for classification and investigation of the evolution of the Na/ K-ATPase alpha-subunit. BMC Ecol Evol 2022; 22:122. [PMID: 36289471 PMCID: PMC9609216 DOI: 10.1186/s12862-022-02071-0] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/19/2022] [Accepted: 09/29/2022] [Indexed: 11/22/2022] Open
Abstract
BACKGROUND Na,K-ATPase is a key protein in maintaining membrane potential that has numerous additional cellular functions. Its catalytic subunit (α), found in a wide range of organisms from prokaryotes to complex eukaryote. Several studies have been done to identify the functions as well as determining the evolutionary relationships of the α-subunit. However, a survey of a larger collection of protein sequences according to sequences similarity and their attributes is very important in revealing deeper evolutionary relationships and identifying specific amino acid differences among evolutionary groups that may have a functional role. RESULTS In this study, 753 protein sequences using phylogenetic tree classification resulted in four groups: prokaryotes (I), fungi and various kinds of Protista and some invertebrates (II), the main group of invertebrates (III), and vertebrates (IV) that was consisted with species tree. The percent of sequences that acquired a specific motif for the α/β subunit assembly increased from group I to group IV. The vertebrate sequences were divided into four groups according to isoforms with each group conforming to the evolutionary path of vertebrates from fish to tetrapods. Data mining was used to identify the most effective attributes in classification of sequences. Using 1252 attributes extracted from the sequences, the decision tree classified them in five groups: Protista, prokaryotes, fungi, invertebrates and vertebrates. Also, vertebrates were divided into four subgroups (isoforms). Generally, the count of different dipeptides and amino acid ratios were the most significant attributes for grouping. Using alignment of sequences identified the effective position of the respective dipeptides in the separation of the groups. So that 208GC is apparently involved in the separation of vertebrates from the four other organism groups, and 41DH, 431FK, and 451KC were involved in separation vertebrate isoform types. CONCLUSION The application of phylogenetic and decision tree analysis for Na,K-ATPase, provides a better understanding of the evolutionary changes according to the amino acid sequence and its related properties that could lead to the identification of effective attributes in the separation of sequences in different groups of phylogenetic tree. In this study, key evolution-related dipeptides are identified which can guide future experimental studies.
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Affiliation(s)
- Marzieh Shahnazari
- grid.412573.60000 0001 0745 1259Department of Plant Production and Genetics, School of Agriculture, Shiraz University, Shiraz, Iran
| | - Zahra Zakipour
- grid.412573.60000 0001 0745 1259Department of Plant Production and Genetics, School of Agriculture, Shiraz University, Shiraz, Iran
| | - Hooman Razi
- grid.412573.60000 0001 0745 1259Department of Plant Production and Genetics, School of Agriculture, Shiraz University, Shiraz, Iran
| | - Ali Moghadam
- grid.412573.60000 0001 0745 1259Institute of Biotechnology, Shiraz University, Shiraz, Iran
| | - Abbas Alemzadeh
- grid.412573.60000 0001 0745 1259Department of Plant Production and Genetics, School of Agriculture, Shiraz University, Shiraz, Iran
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5
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Bondžić AM, Vasić Anićijević DD, Janjić GV, Zeković I, Momić T, Nikezić AV, Vasić VM. Na, K-ATPase as a Biological Target for Gold(III) Complexes: A Theoretical and Experimental Approach. Curr Med Chem 2021; 28:4742-4798. [PMID: 33397227 DOI: 10.2174/0929867328999210101233801] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/31/2020] [Revised: 11/23/2020] [Accepted: 11/24/2020] [Indexed: 11/22/2022]
Abstract
BACKGROUND Gold-based complexes represent a new class of potential metallodrugs. Although their action mechanism is not entirely understood, it was shown that gold complexes inhibit some enzymes' activities. Among them, Na,K-ATPase is emerging as an essential target for various anticancer drugs. The functionalization of nanoparticles by gold(III) complexes could facilitate their delivery into the cells and enable the following of their distribution in the target tissues. OBJECTIVE The paper presents an overview of Na,K-ATPase interaction with representative and structurally related cytotoxic gold(III) complexes. The results obtained by the employment of theoretical methods (DFT and docking studies) combined with the experimental approach involving a variety of nanotechnology-base techniques (UV/Vis, Raman and fluorescence spectroscopy, CD, AFM, DLS) are discussed. Detailed information was obtained on the enzyme's conformational and structural changes upon binding the gold(III) complexes. The experimentally determined reaction parameters (constants of dissociation and the reaction stoichiometry) were predicted theoretically. CONCLUSION The presented results offer further support to the view that Na,K-ATPase may be a relevant biomolecular target for cytotoxic gold(III) compounds of medicinal interest.
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Affiliation(s)
- Aleksandra M Bondžić
- VINCA Institute of Nuclear Sciences, National Institute of thе Republic of Serbia, University of Belgrade, P.O. Box 522, 11000 Belgrade, Serbia
| | - Dragana D Vasić Anićijević
- VINCA Institute of Nuclear Sciences, National Institute of thе Republic of Serbia, University of Belgrade, P.O. Box 522, 11000 Belgrade, Serbia
| | - Goran V Janjić
- Institute of Chemistry, Technology and Metallurgy, National Institute of thе Republic of Serbia, University of Belgrade, Njegoseva 16, Belgrade, Serbia
| | - Ivana Zeković
- VINCA Institute of Nuclear Sciences, National Institute of thе Republic of Serbia, University of Belgrade, P.O. Box 522, 11000 Belgrade, Serbia
| | - Tatjana Momić
- VINCA Institute of Nuclear Sciences, National Institute of thе Republic of Serbia, University of Belgrade, P.O. Box 522, 11000 Belgrade, Serbia
| | - Ana Vujačić Nikezić
- VINCA Institute of Nuclear Sciences, National Institute of thе Republic of Serbia, University of Belgrade, P.O. Box 522, 11000 Belgrade, Serbia
| | - Vesna M Vasić
- VINCA Institute of Nuclear Sciences, National Institute of thе Republic of Serbia, University of Belgrade, P.O. Box 522, 11000 Belgrade, Serbia
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6
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Abstract
Over the past 15 years, investigators have reported on the utility and safety of cardiac glycosides for numerous health benefits including those as treatments for malignant disease, stroke-mediated ischemic injury and certain neurodegenerative diseases. In addition to those, there is a growing body of evidence for novel antiviral effects of selected cardiac glycoside molecules. One unique cardiac glycoside, oleandrin derived from Nerium oleander, has been reported to have antiviral activity specifically against 'enveloped' viruses including HIV and HTLV-1. Importantly, a recent publication has presented in vitro evidence for oleandrin's ability to inhibit production of infectious virus particles when used for treatment prior to, as well as after infection by SARS-CoV-2/COVID-19. This review will highlight the known in vitro antiviral effects of oleandrin as well as present previously unpublished effects of this novel cardiac glycoside against Ebola virus, Cytomegalovirus, and Herpes simplex viruses.
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Affiliation(s)
- Robert A Newman
- Department of Experimental Therapeutics, The University of Texas M. D. Anderson Cancer Center, Houston, TX 77054, USA.,Phoenix Biotechnology, Inc, San Antonio, TX 78217, USA
| | - K Jagannadha Sastry
- Departments of Thoracic, Head and Neck Medical Oncology and Veterinary Sciences, The University of Texas MD Anderson Cancer Center, Houston, TX 77030, USA
| | - Ravit Arav-Boger
- Division of Infectious Diseases, Department of Pediatrics, Medical College of Wisconsin, Milwaukee, WI 53226, USA
| | - Hongyi Cai
- National Institute of Diabetes and Digestive and Kidney Diseases, National Institutes of Health, Bethesda, MD 20892, USA
| | | | - Robert Harrod
- Department of Biological Sciences, the Dedman College Center for Drug Discovery, Design & Delivery, Southern Methodist University, Dallas, TX 75275, USA
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7
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Klimanova EA, Sidorenko SV, Abramicheva PA, Tverskoi AM, Orlov SN, Lopina OD. Transcriptomic Changes in Endothelial Cells Triggered by Na, K-ATPase Inhibition: A Search for Upstream Na +i/K +i Sensitive Genes. Int J Mol Sci 2020; 21:E7992. [PMID: 33121152 DOI: 10.3390/ijms21217992] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/29/2020] [Revised: 10/20/2020] [Accepted: 10/25/2020] [Indexed: 12/14/2022] Open
Abstract
Stimulus-dependent elevation of intracellular Ca2+ affects gene expression via well-documented calmodulin-mediated signaling pathways. Recently, we found that the addition of extra- and intracellular Ca2+ chelators increased, rather than decreased, the number of genes expressed, and that this is affected by the elevation of [Na+]i/[K+]i-ratio. This assumes the existence of a novel Na+i/K+i-mediated Ca2+i-independent mechanism of excitation-transcription coupling. To identify upstream Na+i/K+i-sensitive genes, we examined the kinetics of transcriptomic changes in human umbilical vein endothelial cells (HUVEC) subjected to Na,K-ATPase inhibition by ouabain or K+-free medium. According to our data, microRNAs, transcription factors, and proteins involved in immune response and inflammation might be considered as key components of Na+i/K+i-mediated excitation-transcription coupling. Special attention was focused on the FOS gene and the possible mechanism of transcription regulation via G-quadruplexes, non-canonical secondary structures of nucleic acids, whose stability depends on [Na+]i/[K+]i-ratio. Verification of the [Na+]i/[K+]i-sensitive transcription regulation mechanism should be continued in forthcoming studies.
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8
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De Souza Gonçalves B, Toledo MM, Colodette NM, Chaves ALF, Muniz LV, Ribeiro RIMDA, Dos Santos HB, Cortes VF, Soares JMA, Barbosa LA, de Lima Santos H. Evaluation of the Erythrocyte Membrane in Head and Neck Cancer Patients. J Membr Biol 2020; 253:617-629. [PMID: 33089392 DOI: 10.1007/s00232-020-00147-w] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/31/2020] [Accepted: 10/10/2020] [Indexed: 11/28/2022]
Abstract
Head and neck squamous cell carcinoma (HNSCC) is a heterogeneous and complex disease, both from a clinical and molecular point of view. The prolonged use of alcohol and tobacco, along with the release of tumor secretions can modulate blood cells, such as erythrocytes. Here, this study was conducted with 24 patients diagnosed with HNSCC and an equal number of healthy individuals are matched by age and gender. The levels of lipid peroxidation were measured using the individual plasma, while for lipid concentrations, identification and quantification Na, K-ATPase activity and osmotic fragility, the red blood cell concentrate were used. The release of TBARS was significantly higher in patients with HNSCC. The lipid profile assays demonstrated a rearrangement of the erythrocyte membrane due to a decrease in total phospholipids and phosphatidylethanolamine followed by an increase in total cholesterol and phosphatidylcholine. Na, K-ATPase activity also increased. Erythrocytes were more fragile in patients with HNSCC than in health individuals. Therefore, the membrane of erythrocytes were rearranged and Na, K-ATPase function altered in the HNSCC patients. Our findings suggests that the alcohol, tobacco and tumor secretion modulate in a specific manner that the erythrocytes membranes of these patients making this system a potential tool for HNSCC biomarker of tumor progression.
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Affiliation(s)
- Bruno De Souza Gonçalves
- Laboratório de Bioquímica Celular, Federal University of São João del Rei, Campus Centro-Oeste Dona Lindu, Av Sebastião Gonçalves Coelho, 400, Divinopolis, MG, 35501-296, Brazil
| | - Marina Marques Toledo
- Laboratório de Bioquímica Celular, Federal University of São João del Rei, Campus Centro-Oeste Dona Lindu, Av Sebastião Gonçalves Coelho, 400, Divinopolis, MG, 35501-296, Brazil
| | - Natalie Mounteer Colodette
- Laboratório de Bioquímica Celular, Federal University of São João del Rei, Campus Centro-Oeste Dona Lindu, Av Sebastião Gonçalves Coelho, 400, Divinopolis, MG, 35501-296, Brazil
| | - Aline Lauda Freitas Chaves
- Study Group On Head and Neck Cancer, Federal University of São João del Rei, Campus Centro-Oeste Dona Lindu, Divinópolis, Minas Gerais, Brazil
| | - Luciana Vieira Muniz
- Study Group On Head and Neck Cancer, Federal University of São João del Rei, Campus Centro-Oeste Dona Lindu, Divinópolis, Minas Gerais, Brazil
| | - Rosy Iara Maciel De A Ribeiro
- Laboratório de Patologia Experimental, Federal University of São João del Rei, Campus Centro-Oeste Dona Lindu, Divinópolis, MG, Brazil
| | - Hélio Batista Dos Santos
- Laboratório de Processamento de Tecidos, Federal University of São João del Rei, Campus Centro-Oeste Dona Lindu, Divinópolis, MG, Brazil
| | - Vanessa F Cortes
- Laboratório de Bioquímica Celular, Federal University of São João del Rei, Campus Centro-Oeste Dona Lindu, Av Sebastião Gonçalves Coelho, 400, Divinopolis, MG, 35501-296, Brazil
| | - João Marcos Arantes Soares
- Study Group On Head and Neck Cancer, Federal University of São João del Rei, Campus Centro-Oeste Dona Lindu, Divinópolis, Minas Gerais, Brazil.,Faculdade de Medicina, Federal University of São João del Rei, Campus Centro-Oeste Dona Lindu, Divinopolis, Minas Gerais, Brazil
| | - Leandro A Barbosa
- Laboratório de Bioquímica Celular, Federal University of São João del Rei, Campus Centro-Oeste Dona Lindu, Av Sebastião Gonçalves Coelho, 400, Divinopolis, MG, 35501-296, Brazil.
| | - Hérica de Lima Santos
- Laboratório de Bioquímica Celular, Federal University of São João del Rei, Campus Centro-Oeste Dona Lindu, Av Sebastião Gonçalves Coelho, 400, Divinopolis, MG, 35501-296, Brazil.
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9
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Pirkmajer S, Bezjak K, Matkovič U, Dolinar K, Jiang LQ, Miš K, Gros K, Milovanova K, Pirkmajer KP, Marš T, Kapilevich L, Chibalin AV. Ouabain Suppresses IL-6/STAT3 Signaling and Promotes Cytokine Secretion in Cultured Skeletal Muscle Cells. Front Physiol 2020; 11:566584. [PMID: 33101052 PMCID: PMC7544989 DOI: 10.3389/fphys.2020.566584] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/28/2020] [Accepted: 08/25/2020] [Indexed: 12/16/2022] Open
Abstract
The cardiotonic steroids (CTS), such as ouabain and marinobufagenin, are thought to be adrenocortical hormones secreted during exercise and the stress response. The catalytic α-subunit of Na,K-ATPase (NKA) is a CTS receptor, whose largest pool is located in skeletal muscles, indicating that muscles are a major target for CTS. Skeletal muscles contribute to adaptations to exercise by secreting interleukin-6 (IL-6) and plethora of other cytokines, which exert paracrine and endocrine effects in muscles and non-muscle tissues. Here, we determined whether ouabain, a prototypical CTS, modulates IL-6 signaling and secretion in the cultured human skeletal muscle cells. Ouabain (2.5–50 nM) suppressed the abundance of STAT3, a key transcription factor downstream of the IL-6 receptor, as well as its basal and IL-6-stimulated phosphorylation. Conversely, ouabain (50 nM) increased the phosphorylation of ERK1/2, Akt, p70S6K, and S6 ribosomal protein, indicating activation of the ERK1/2 and the Akt-mTOR pathways. Proteasome inhibitor MG-132 blocked the ouabain-induced suppression of the total STAT3, but did not prevent the dephosphorylation of STAT3. Ouabain (50 nM) suppressed hypoxia-inducible factor-1α (HIF-1α), a modulator of STAT3 signaling, but gene silencing of HIF-1α and/or its partner protein HIF-1β did not mimic effects of ouabain on the phosphorylation of STAT3. Ouabain (50 nM) failed to suppress the phosphorylation of STAT3 and HIF-1α in rat L6 skeletal muscle cells, which express the ouabain-resistant α1-subunit of NKA. We also found that ouabain (100 nM) promoted the secretion of IL-6, IL-8, GM-CSF, and TNF-α from the skeletal muscle cells of healthy subjects, and the secretion of GM-CSF from cells of subjects with the type 2 diabetes. Marinobufagenin (10 nM), another important CTS, did not alter the secretion of these cytokines. In conclusion, our study shows that ouabain suppresses the IL-6 signaling via STAT3, but promotes the secretion of IL-6 and other cytokines, which might represent a negative feedback in the IL-6/STAT3 pathway. Collectively, our results implicate a role for CTS and NKA in regulation of the IL-6 signaling and secretion in skeletal muscle.
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Affiliation(s)
- Sergej Pirkmajer
- Institute of Pathophysiology, Faculty of Medicine, University of Ljubljana, Ljubljana, Slovenia
| | - Katja Bezjak
- Institute of Pathophysiology, Faculty of Medicine, University of Ljubljana, Ljubljana, Slovenia
| | - Urška Matkovič
- Institute of Pathophysiology, Faculty of Medicine, University of Ljubljana, Ljubljana, Slovenia
| | - Klemen Dolinar
- Institute of Pathophysiology, Faculty of Medicine, University of Ljubljana, Ljubljana, Slovenia
| | - Lake Q Jiang
- Integrative Physiology, Department of Molecular Medicine and Surgery, Karolinska Institutet, Stockholm, Sweden
| | - Katarina Miš
- Institute of Pathophysiology, Faculty of Medicine, University of Ljubljana, Ljubljana, Slovenia
| | - Katarina Gros
- Institute of Pathophysiology, Faculty of Medicine, University of Ljubljana, Ljubljana, Slovenia
| | - Kseniya Milovanova
- Department of Sports and Health Tourism, Sports Physiology and Medicine, National Research Tomsk State University, Tomsk, Russia
| | - Katja Perdan Pirkmajer
- Department of Rheumatology, University Medical Centre Ljubljana, Ljubljana, Slovenia.,Department of Internal Medicine, Faculty of Medicine, University of Ljubljana, Ljubljana, Slovenia
| | - Tomaž Marš
- Institute of Pathophysiology, Faculty of Medicine, University of Ljubljana, Ljubljana, Slovenia
| | - Leonid Kapilevich
- Department of Sports and Health Tourism, Sports Physiology and Medicine, National Research Tomsk State University, Tomsk, Russia.,Central Scientific Laboratory, Siberian State Medical University, Tomsk, Russia
| | - Alexander V Chibalin
- Integrative Physiology, Department of Molecular Medicine and Surgery, Karolinska Institutet, Stockholm, Sweden
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10
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Liang Z, Yin X, Sun W, Zhang S, Chen X, Pei L, Zhao N. Enhanced protection against lipopolysaccharide-induced acute lung injury by autologous transplantation of adipose-derived stromal cells combined with low tidal volume ventilation in rats. J Cell Physiol 2020; 236:1295-1308. [PMID: 32662079 DOI: 10.1002/jcp.29936] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/30/2020] [Accepted: 07/02/2020] [Indexed: 12/30/2022]
Abstract
Adipose-derived stromal cells (ADSCs) showed excellent capacity in regeneration and tissue protection. Low tidal volume ventilation (LVT) strategy demonstrates a therapeutic benefit on the treatment of acute lung injury/acute respiratory distress syndrome (ALI/ARDS). This study, therefore, aimed to undertaken determine whether the combined LVT and ADSCs treatment exerts additional protection against lipopolysaccharide (LPS)-induced ALI in rats. The animals were randomized into seven groups: Group I (control), Group II (instillation of LPS at 10 mg/kg intratracheally), Group III (LPS+LVT 6 ml/kg), Group IV (LPS+intravenous autologous 5 × 106 ADSCs which were pretreated with a scrambled small interfering RNA [siRNA] of keratinocyte growth factor [KGF] negative control), Group V (LPS+ADSCs which were pretreated with a scrambled siRNA of KGF, Group VI (LPS+LVT and ADSCs as in the Group IV), and Group VII (LPS+LVT and ADSCs as in the Group V). We found that levels of tumor necrosis factor-α, transforming growth factor-β1, and interleukin (IL)-1β and IL-6, the proinflammatory cytokines, were remarkably increased in LPS rats. Moreover, the expressions of ENaC, activity of Na, K-ATPase, and alveolar fluid clearance (AFC) were obviously reduced by LPS-induced ALI. The rats treated by ADSCs showed improved effects in all these changes of ALI and further enhanced by ADSCs combined with LVT treatment. Importantly, the treatment of ADSCs with siRNA-mediated knockdown of KGF partially eliminated the therapeutic effects. In conclusion, combined treatment with ADSCs and LVT not only is superior to either ADSCs or LVT therapy alone in the prevention of ALI. Evidence of the beneficial effect may be partly due to improving AFC by paracrine or systemic production of KGF and anti-inflammatory properties.
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Affiliation(s)
- Zuodi Liang
- Department of Anesthesiology, The First Hospital Affiliated at China Medical University, Shenyang, China
| | - Xiuru Yin
- Department of Anesthesiology, The First Hospital Affiliated at China Medical University, Shenyang, China
| | - Wenchong Sun
- Department of Anesthesiology, The First Hospital Affiliated at China Medical University, Shenyang, China
| | - Shuo Zhang
- Department of Anesthesiology, The First Hospital Affiliated at China Medical University, Shenyang, China
| | - Xiaohuan Chen
- Department of Anesthesiology, The First Hospital Affiliated at China Medical University, Shenyang, China
| | - Ling Pei
- Department of Anesthesiology, The First Hospital Affiliated at China Medical University, Shenyang, China
| | - Ning Zhao
- Department of ENT, The First Hospital Affiliated at China Medical University, Shenyang, China
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11
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Han J, Li H, Bhandari S, Cao F, Wang XY, Tian C, Li XY, Zhang PH, Liu YJ, Wu CH, Smith FG, Jin SW, Hao Y. Maresin Conjugates in Tissue Regeneration 1 improves alveolar fluid clearance by up-regulating alveolar ENaC, Na, K-ATPase in lipopolysaccharide-induced acute lung injury. J Cell Mol Med 2020; 24:4736-4747. [PMID: 32160403 PMCID: PMC7176857 DOI: 10.1111/jcmm.15146] [Citation(s) in RCA: 22] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/08/2019] [Revised: 02/19/2020] [Accepted: 02/23/2020] [Indexed: 12/31/2022] Open
Abstract
Maresin Conjugates in Tissue Regeneration 1 (MCTR1) is a newly identified macrophage‐derived sulfido‐conjugated mediator that stimulates the resolution of inflammation. This study assessed the role of MCTR1 in alveolar fluid clearance (AFC) in a rat model of acute lung injury (ALI) induced by lipopolysaccharide (LPS). Rats were intravenously injected with MCTR1 at a dose of 200 ng/rat, 8 hours after administration of 14 mg/kg LPS. The level of AFC was then determined in live rats. Primary rat ATII (Alveolar Type II) epithelial cells were also treated with MCTR1 (100 nmol/L) in a culture medium containing LPS for 8 hours. MCTR1 treatment improved AFC (18.85 ± 2.07 vs 10.11 ± 1.08, P < .0001) and ameliorated ALI in rats. MCTR1 also significantly promoted AFC by up‐regulating epithelial sodium channel (ENaC) and Na+‐K+‐adenosine triphosphatase (Na, K‐ATPase) expressions in vivo. MCTR1 also activated Na, K‐ATPase and elevated phosphorylated‐Akt (P‐Akt) by up‐regulating the expression of phosphorylated Nedd4‐2 (P‐Nedd4‐2) in vivo and in vitro. However, BOC‐2 (ALX inhibitor), KH7 (cAMP inhibitor) and LY294002 (PI3K inhibitor) abrogated the improved AFC induced by MCTR1. Based on the findings of this study, MCTR1 may be a novel therapeutic approach to improve reabsorption of pulmonary oedema during ALI/acute respiratory distress syndrome (ARDS).
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Affiliation(s)
- Jun Han
- Department of Anaesthesia and Critical Care, The Second Affiliated Hospital and Yuying Children's Hospital of Wenzhou Medical University, Zhejiang, China
| | - Hui Li
- Department of Anaesthesia and Critical Care, The Second Affiliated Hospital and Yuying Children's Hospital of Wenzhou Medical University, Zhejiang, China.,Key Laboratory of Anaesthesiology of Zhejiang Province, The Second Affiliated Hospital and Yuying Children's Hospital of Wenzhou Medical University, Zhejiang, China
| | - Suwas Bhandari
- Department of Anaesthesia and Critical Care, The Second Affiliated Hospital and Yuying Children's Hospital of Wenzhou Medical University, Zhejiang, China
| | - Fei Cao
- Department of Anaesthesia and Critical Care, The Second Affiliated Hospital and Yuying Children's Hospital of Wenzhou Medical University, Zhejiang, China
| | - Xin-Yang Wang
- Department of Anaesthesia and Critical Care, The Second Affiliated Hospital and Yuying Children's Hospital of Wenzhou Medical University, Zhejiang, China
| | - Chao Tian
- Department of Anaesthesia and Critical Care, The Second Affiliated Hospital and Yuying Children's Hospital of Wenzhou Medical University, Zhejiang, China
| | - Xin-Yu Li
- Department of Anaesthesia and Critical Care, The Second Affiliated Hospital and Yuying Children's Hospital of Wenzhou Medical University, Zhejiang, China
| | - Pu-Hong Zhang
- Department of Anaesthesia and Critical Care, The Second Affiliated Hospital and Yuying Children's Hospital of Wenzhou Medical University, Zhejiang, China
| | - Yong-Jian Liu
- Department of Anaesthesia and Critical Care, The Second Affiliated Hospital and Yuying Children's Hospital of Wenzhou Medical University, Zhejiang, China
| | - Cheng-Hua Wu
- Department of Anaesthesia and Critical Care, The Second Affiliated Hospital and Yuying Children's Hospital of Wenzhou Medical University, Zhejiang, China
| | - Fang Gao Smith
- Academic Department of Anaesthesia, Critical Care, Pain and Resuscitation, Birmingham Heartlands Hospital, Heart of England National Health Service Foundation Trust, Birmingham, UK
| | - Sheng-Wei Jin
- Department of Anaesthesia and Critical Care, The Second Affiliated Hospital and Yuying Children's Hospital of Wenzhou Medical University, Zhejiang, China
| | - Yu Hao
- Department of Anaesthesia and Critical Care, The Second Affiliated Hospital and Yuying Children's Hospital of Wenzhou Medical University, Zhejiang, China
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12
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Abstract
Compromised Na+/K+-ATPase function is associated with the occurrence of spreading depolarization (SD). Mutations in ATP1A2, the gene encoding the α2 isoform of the Na+/K+-ATPase, were identified in patients with familial hemiplegic migraine type 2 (FHM2), a Mendelian model disease for SD. This suggests a distinct role for the α2 isoform in modulating SD susceptibility and raises questions about underlying mechanisms including the roles of other Na+/K+-ATPase α isoforms. Here, we investigated the effects of genetic ablation and pharmacological inhibition of α1, α2, and α3 on SD using heterozygous knock-out mice. We found that only α2 heterozygous mice displayed higher SD susceptibility when challenged with prolonged extracellular high potassium concentration ([K+]o), a pronounced post SD oligemia and higher SD speed in-vivo. By contrast, under physiological [K+]o, α2 heterozygous mice showed similar SD susceptibility compared to wild-type littermates. Deficiency of α3 resulted in increased resistance against electrically induced SD in-vivo, whereas α1 deficiency did not affect SD. The results support important roles of the α2 isoform in SD. Moreover, they suggest that specific experimental conditions can be necessary to reveal an inherent SD phenotype by driving a (meta-) stable system into decompensation, reminiscent of the episodic nature of SDs in various diseases.
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Affiliation(s)
- Clemens Reiffurth
- Department of Experimental Neurology, Charité-University Medicine Berlin, Berlin, Germany.,Center for Stroke Research, Charité-University Medicine Berlin, Berlin, Germany
| | - Mesbah Alam
- Department of Neurosurgery, Hannover Medical School, Hannover, Germany
| | - Mahdi Zahedi-Khorasani
- Research Center and Department of Physiology, School of Medicine, Semnan University of Medical Sciences, Semnan, Iran
| | - Sebastian Major
- Department of Experimental Neurology, Charité-University Medicine Berlin, Berlin, Germany.,Center for Stroke Research, Charité-University Medicine Berlin, Berlin, Germany.,Department of Neurology, Charité-University Medicine Berlin, Berlin, Germany
| | - Jens P Dreier
- Department of Experimental Neurology, Charité-University Medicine Berlin, Berlin, Germany.,Center for Stroke Research, Charité-University Medicine Berlin, Berlin, Germany.,Department of Neurology, Charité-University Medicine Berlin, Berlin, Germany.,Bernstein Center for Computational Neuroscience Berlin, Berlin, Germany.,Einstein Center for Neurosciences Berlin, Berlin, Germany
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13
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Okamoto T, Wu Y, Matsuhisa K, Saito A, Sakaue F, Imaizumi K, Kaneko M. Hypertonicity-responsive ubiquitin ligase RNF183 promotes Na, K-ATPase lysosomal degradation through ubiquitination of its β1 subunit. Biochem Biophys Res Commun 2019; 521:1030-1035. [PMID: 31732153 DOI: 10.1016/j.bbrc.2019.11.001] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/11/2019] [Accepted: 11/01/2019] [Indexed: 12/13/2022]
Abstract
We previously reported that RNF183, a member of the RING finger (RNF) protein family, is specifically expressed in the renal collecting duct and that RNF183 mRNA is induced by the activity of nuclear factor of activated T cells 5 (NFAT5), which regulates the transcription of essential proteins for adaptation to hypertonic conditions. The renal medulla is the only tissue that is continuously hypertonic; therefore, RNF183 possibly plays an important role in adaptation to continuous hypertonic conditions. However, the mechanism of how cells adapt to long-term hypertonicity via RNF183 remains unclear. In this study, the Na, K-ATPase α1 subunit was identified as a candidate substrate of RNF183 by the BirA proximity-biotinylation technique. The Na, K-ATPase α1 subunit acts as an ion transporter along with the Na, K-ATPase β1 subunit at the plasma membrane. We confirmed that RNF183 interacted with both α1 and β1 subunits; however, we found that RNF183 ubiquitinated only the β1 subunit, not the α1 subunit. Furthermore, RNF183 translocated both α1 and β1 subunits from the plasma membrane to lysosomes. In addition, the expression levels of α1 and β1 subunits in HEK293 cells stably expressing RNF183 were significantly decreased compared with mock control cells, and were restored by siRNA-mediated knockdown of RNF183. Moreover, in RNF183-expressing cells, chloroquine treatment increased the protein levels of the α1 and β1 subunits. Therefore, our results suggest that Na, K-ATPase α1 and β1 subunits are degraded in lysosomes by RNF183-mediated ubiquitination of β1 subunit.
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Affiliation(s)
- Takumi Okamoto
- Department of Biochemistry, Graduate School of Biomedical and Health Science, Hiroshima University, 1-2-3 Kasumi, Minami-ku, Hiroshima, 734-8553, Japan
| | - Yan Wu
- Department of Biochemistry, Graduate School of Biomedical and Health Science, Hiroshima University, 1-2-3 Kasumi, Minami-ku, Hiroshima, 734-8553, Japan
| | - Koji Matsuhisa
- Department of Biochemistry, Graduate School of Biomedical and Health Science, Hiroshima University, 1-2-3 Kasumi, Minami-ku, Hiroshima, 734-8553, Japan
| | - Atsushi Saito
- Department of Stress Protein Processing, Graduate School of Biomedical and Health Science, Hiroshima University, 1-2-3 Kasumi, Minami-ku, Hiroshima, 734-8553, Japan
| | - Fumika Sakaue
- Department of Stress Protein Processing, Graduate School of Biomedical and Health Science, Hiroshima University, 1-2-3 Kasumi, Minami-ku, Hiroshima, 734-8553, Japan
| | - Kazunori Imaizumi
- Department of Biochemistry, Graduate School of Biomedical and Health Science, Hiroshima University, 1-2-3 Kasumi, Minami-ku, Hiroshima, 734-8553, Japan
| | - Masayuki Kaneko
- Department of Biochemistry, Graduate School of Biomedical and Health Science, Hiroshima University, 1-2-3 Kasumi, Minami-ku, Hiroshima, 734-8553, Japan.
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14
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Dobler S, Wagschal V, Pietsch N, Dahdouli N, Meinzer F, Romey-Glüsing R, Schütte K. New ways to acquire resistance: imperfect convergence in insect adaptations to a potent plant toxin. Proc Biol Sci 2019; 286:20190883. [PMID: 31387508 PMCID: PMC6710594 DOI: 10.1098/rspb.2019.0883] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/15/2019] [Accepted: 07/17/2019] [Indexed: 12/22/2022] Open
Abstract
Evolution of insensitivity to the toxic effects of cardiac glycosides has become a model in the study of convergent evolution, as five taxonomic orders of insects use the same few similar amino acid substitutions in the otherwise highly conserved Na,K-ATPase α. We show here that insensitivity in pyrgomorphid grasshoppers evolved along a slightly divergent path. As in other lineages, duplication of the Na,K-ATPase α gene paved the way for subfunctionalization: one copy maintains the ancestral, sensitive state, while the other copy is resistant. Nonetheless, in contrast with all other investigated insects, the grasshoppers' resistant copy shows length variation by two amino acids in the first extracellular loop, the main part of the cardiac glycoside-binding pocket. RT-qPCR analyses confirmed that this copy is predominantly expressed in tissues exposed to the toxins, while the ancestral copy predominates in the nervous tissue. Functional tests with genetically engineered Drosophila Na,K-ATPases bearing the first extracellular loop of the pyrgomorphid genes showed the derived form to be highly resistant, while the ancestral state is sensitive. Thus, we report convergence in gene duplication and in the gene targets for toxin insensitivity; however, the means to the phenotypic end have been novel in pyrgomorphid grasshoppers.
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Affiliation(s)
- Susanne Dobler
- Molecular Evolutionary Biology, Institute of Zoology, Universität Hamburg, Hamburg, Germany
| | - Vera Wagschal
- Molecular Evolutionary Biology, Institute of Zoology, Universität Hamburg, Hamburg, Germany
| | - Niels Pietsch
- Molecular Evolutionary Biology, Institute of Zoology, Universität Hamburg, Hamburg, Germany
| | - Nadja Dahdouli
- Molecular Evolutionary Biology, Institute of Zoology, Universität Hamburg, Hamburg, Germany
| | - Fee Meinzer
- Molecular Evolutionary Biology, Institute of Zoology, Universität Hamburg, Hamburg, Germany
| | - Renja Romey-Glüsing
- Molecular Evolutionary Biology, Institute of Zoology, Universität Hamburg, Hamburg, Germany
| | - Kai Schütte
- Animal Ecology and Conservation, Institute of Zoology, Universität Hamburg, Hamburg, Germany
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15
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Staehr C, Hangaard L, Bouzinova EV, Kim S, Rajanathan R, Boegh Jessen P, Luque N, Xie Z, Lykke-Hartmann K, Sandow SL, Aalkjaer C, Matchkov VV. Smooth muscle Ca 2+ sensitization causes hypercontractility of middle cerebral arteries in mice bearing the familial hemiplegic migraine type 2 associated mutation. J Cereb Blood Flow Metab 2019; 39. [PMID: 29513112 PMCID: PMC6681533 DOI: 10.1177/0271678x18761712] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
Familial hemiplegic migraine type 2 (FHM2) is associated with inherited point-mutations in the Na,K-ATPase α2 isoform, including G301R mutation. We hypothesized that this mutation affects specific aspects of vascular function, and thus compared cerebral and systemic arteries from heterozygote mice bearing the G301R mutation (Atp1a2+/-G301R) with wild type (WT). Middle cerebral (MCA) and mesenteric small artery (MSA) function was compared in an isometric myograph. Cerebral blood flow was assessed with Laser speckle analysis. Intracellular Ca2+ and membrane potential were measured simultaneously. Protein expression was semi-quantified by immunohistochemistry. Protein phosphorylation was analysed by Western blot. MSA from Atp1a2+/-G301R and WT showed similar contractile responses. The Atp1a2+/-G301R MCA constricted stronger to U46619, endothelin and potassium compared to WT. This was associated with an increased depolarization, although the Ca2+ change was smaller than in WT. The enhanced constriction of Atp1a2+/-G301R MCA was associated with increased cSrc activation, stronger sensitization to [Ca2+]i and increased MYPT1 phosphorylation. These differences were abolished by cSrc inhibition. Atp1a2+/-G301R mice had reduced resting blood flow through MCA in comparison with WT mice. FHM2-associated mutation leads to elevated contractility of MCA due to sensitization of the contractile machinery to Ca2+, which is mediated via Na,K-ATPase/Src-kinase/MYPT1 signalling.
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Affiliation(s)
| | - Lise Hangaard
- 1 Department of Biomedicine, Aarhus University, Aarhus, Denmark
| | | | - Sukhan Kim
- 1 Department of Biomedicine, Aarhus University, Aarhus, Denmark
| | | | | | - Nathan Luque
- 2 Faculty of Science, Health, Education and Engineering, University of the Sunshine Coast, Queensland, Australia
| | - Zijian Xie
- 3 Marshall Institute for Interdisciplinary Research, Marshall University, Huntington, WV, USA
| | | | - Shaun L Sandow
- 2 Faculty of Science, Health, Education and Engineering, University of the Sunshine Coast, Queensland, Australia
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16
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de Souza Gonçalves B, de Moura Valadares JM, Alves SLG, Silva SC, Rangel LP, Cortes VF, Villar JAFP, Barbosa LA, de Lima Santos H. Evaluation of neuroprotective activity of digoxin and semisynthetic derivatives against partial chemical ischemia. J Cell Biochem 2019; 120:17108-17122. [PMID: 31310381 DOI: 10.1002/jcb.28971] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/16/2018] [Revised: 03/29/2019] [Accepted: 04/08/2019] [Indexed: 02/06/2023]
Abstract
Recently, cardiotonic steroids (CTS) have been shown to lead to the activation of Na,K-ATPase at low concentrations in brain, promoting neuroprotection against ischemia. We report here the results of the use of digoxin and its semisynthetic derivatives BD-14, BD-15, and BD-16 against partial chemical ischemic induction followed by reperfusion in murine neuroblastoma cells neuro-2a (N2a). For chemical ischemic induction, sodium azide (5 mM) was used for 5 hours, and then reperfusion was induced for 24 hours. Na,K-ATPase activity and protein levels were analyzed in membrane preparation of N2a cells pretreated with the compounds (150 nM), in the controls and in induced chemical ischemia. In the Na,K-ATPase activity and protein levels assays, the steroids digoxin and BD-15 demonstrated a capacity to modulate the activity of the enzyme directly, increasing its levels of expression and activity. Oxidative parameters, such as superoxide dismutase (SOD) activity, lipid peroxidation (thiobarbituric acid reactive substance), glutathione peroxidase (GPx), glutathione (GSH) levels, hydrogen peroxide content, and the amount of free radicals (reactive oxygen species) during induced chemical ischemia were also evaluated. Regarding the redox state, lipid peroxidation, hydrogen peroxide content, and GPx activity, we have observed an increase in the chemical ischemic group, and a reduction in the groups treated with CTS. SOD activity increased in all treated groups when compared to control and GSH levels decreased when treated with sodium azide and did not change with CTS treatments. Regarding the lipid profile, we saw a decrease in the content of phospholipids and cholesterol in the chemical ischemic group, and an increase in the groups treated with CTS. In conclusion, the compounds used in this study demonstrate promising results, since they appear to promote neuroprotection in cells exposed to chemical ischemia.
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Affiliation(s)
- Bruno de Souza Gonçalves
- Laboratório de Bioquímica Celular, Universidade Federal de São João del Rei, Divinópolis, Minas Gerais, Brazil
| | | | - Silmara L G Alves
- Laboratório de Síntese Orgânica e Nanoestruturas, Universidade Federal de São João del Rei, Divinópolis, Minas Gerais, Brazil
| | - Simone C Silva
- Laboratório de Síntese Orgânica e Nanoestruturas, Universidade Federal de São João del Rei, Divinópolis, Minas Gerais, Brazil
| | - Luciana P Rangel
- Laboratório de Bioquímica Tumoral, Faculdade de Farmácia, Universidade Federal do Rio de Janeiro, Rio de Janeiro, Brazil
| | - Vanessa F Cortes
- Laboratório de Bioquímica Celular, Universidade Federal de São João del Rei, Divinópolis, Minas Gerais, Brazil
| | - José A F P Villar
- Laboratório de Síntese Orgânica e Nanoestruturas, Universidade Federal de São João del Rei, Divinópolis, Minas Gerais, Brazil
| | - Leandro A Barbosa
- Laboratório de Bioquímica Celular, Universidade Federal de São João del Rei, Divinópolis, Minas Gerais, Brazil
| | - Hérica de Lima Santos
- Laboratório de Bioquímica Celular, Universidade Federal de São João del Rei, Divinópolis, Minas Gerais, Brazil
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17
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Pinheiro IRR, Melo MFN, de Sousa SV, Cardoso BG, da Silva TM, Rangel LP, Cortes VF, de Lima Santos H, Chaves VE, Garcia IJP, Barbosa LA. Evaluation of the effect of cafeteria diet on the kidney Na, K-ATPase activity, and oxidative stress. J Cell Biochem 2019; 120:19052-19063. [PMID: 31265167 DOI: 10.1002/jcb.29228] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/25/2018] [Accepted: 06/04/2019] [Indexed: 11/07/2022]
Abstract
In this study, renal tissue, subdivided into the cortex and medulla of Wistar rats subjected to a cafeteria diet (CAF) for 24 days or to normal diet, was used to analyze whether the renal enzyme Na,K-ATPase activity was modified by CAF diet, as well as to analyze the α1 subunit of renal Na,K-ATPase expression levels. The lipid profile of the renal plasma membrane and oxidative stress were verified. In the Na,K-ATPase activity evaluation, no alteration was found, but a significant decrease of 30% in the cortex was detected in the α1 subunit expression of the enzyme. There was a 24% decrease in phospholipids in the cortex of rats submitted to CAF, a 17% increase in cholesterol levels in the cortex, and a 23% decrease in the medulla. Lipid peroxidation was significantly increased in the groups submitted to CAF, both in the cortical region, 29%, and in the medulla, 35%. Also, a reduction of 45% in the glutathione levels was observed in the cortex and medulla with CAF. CAF showed a nearly two-fold increase in glutathione peroxidase (GPX) activity in relation to the control group in the cortex and a 59% increase in the GPx activity in the medulla. In conclusion, although the diet was administered for a short period of time, important results were found, especially those related to the lipid profile and oxidative stress, which may directly affect renal function.
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Affiliation(s)
- Isadora Reis Restier Pinheiro
- Laboratório de Bioquímica Celular, Universidade Federal de São João del-Rei, Campus Centro-Oeste Dona Lindu, Divinópolis, Minas Gerais, Brazil
| | - Marina Fátima Nunes Melo
- Laboratório de Bioquímica Celular, Universidade Federal de São João del-Rei, Campus Centro-Oeste Dona Lindu, Divinópolis, Minas Gerais, Brazil
| | - Sarah Vivas de Sousa
- Laboratório de Bioquímica Celular, Universidade Federal de São João del-Rei, Campus Centro-Oeste Dona Lindu, Divinópolis, Minas Gerais, Brazil
| | - Bárbara Gatti Cardoso
- Laboratório de Fisiologia, Universidade Federal de São João del-Rei, Campus Centro-Oeste Dona Lindu, Divinópolis, Minas Gerais, Brazil
| | - Thaís Marques da Silva
- Laboratório de Fisiologia, Universidade Federal de São João del-Rei, Campus Centro-Oeste Dona Lindu, Divinópolis, Minas Gerais, Brazil
| | - Luciana Pereira Rangel
- Laboratório de Bioquímica Tumoral, Faculdade de Farmácia, Universidade Federal do Rio de Janeiro, Rio de Janeiro, Brazil
| | - Vanessa Faria Cortes
- Laboratório de Bioquímica Celular, Universidade Federal de São João del-Rei, Campus Centro-Oeste Dona Lindu, Divinópolis, Minas Gerais, Brazil.,Laboratório de de Bioquímica de Membranas e ATPases, Universidade Federal de São João del-Rei, Campus Centro-Oeste Dona Lindu, Divinópolis, Minas Gerais, Brazil
| | - Hérica de Lima Santos
- Laboratório de Bioquímica Celular, Universidade Federal de São João del-Rei, Campus Centro-Oeste Dona Lindu, Divinópolis, Minas Gerais, Brazil.,Laboratório de de Bioquímica de Membranas e ATPases, Universidade Federal de São João del-Rei, Campus Centro-Oeste Dona Lindu, Divinópolis, Minas Gerais, Brazil
| | - Valéria Ernestânia Chaves
- Laboratório de Fisiologia, Universidade Federal de São João del-Rei, Campus Centro-Oeste Dona Lindu, Divinópolis, Minas Gerais, Brazil
| | - Israel José Pereira Garcia
- Laboratório de Bioquímica Celular, Universidade Federal de São João del-Rei, Campus Centro-Oeste Dona Lindu, Divinópolis, Minas Gerais, Brazil.,Laboratório de de Bioquímica de Membranas e ATPases, Universidade Federal de São João del-Rei, Campus Centro-Oeste Dona Lindu, Divinópolis, Minas Gerais, Brazil
| | - Leandro Augusto Barbosa
- Laboratório de Bioquímica Celular, Universidade Federal de São João del-Rei, Campus Centro-Oeste Dona Lindu, Divinópolis, Minas Gerais, Brazil.,Laboratório de de Bioquímica de Membranas e ATPases, Universidade Federal de São João del-Rei, Campus Centro-Oeste Dona Lindu, Divinópolis, Minas Gerais, Brazil
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18
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Lakunina VA, Burnysheva KM, Mitkevich VA, Makarov AA, Petrushanko IY. [Changes in the receptor function of Na, K-ATPase during hypoxia and ischemia]. Mol Biol (Mosk) 2019; 51:172-179. [PMID: 28251981 DOI: 10.7868/s0026898417010104] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/24/2016] [Accepted: 06/24/2016] [Indexed: 11/23/2022]
Abstract
Na,K-ATPase maintains sodium and potassium homeostasis. It is the only known receptor for cardiotonic steroids such as ouabain. Binding of ouabain to Na,K-ATPase leads to the activation of Src kinase and the subsequent initiation of intracellular signaling pathways, including the induction of apoptosis. Changes in Na,K-ATPase activity is one of the earliest responses to hypoxia and is most critical for cell survival. However, it is not known how the hypoxia affects the functioning of Na,K-ATPase as a receptor. We have shown that, under the conditions of hypoxia and ischemia, ouabain is less toxic for murine fibroblast cells (SC-1 cell line) and ouabain does not cause an increase in the level of reactive oxygen species, which is typically observed at 20% pO2. Under hypoxia, the treatment of cells with ouabain also does not lead to the activation of Na,K-ATPase-associated Src kinase. Thus, at low oxygen content, the receptor function of Na,K-ATPase is altered, and cells become less sensitive to cardiotonic steroids. The decrease in sensitivity to cardiotonic steroids, which is evident at hypoxic conditions, should be taken into account in clinical practice. At the same time, in the presence of ouabain the cells are less sensitive to hypoxia, which indicates that cardiotonic steroids can be protective in acute ischemia.
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Affiliation(s)
- V A Lakunina
- Engelhardt Institute of Molecular Biology Russian Academy of Sciences, Moscow, 119991 Russia
| | - K M Burnysheva
- Engelhardt Institute of Molecular Biology Russian Academy of Sciences, Moscow, 119991 Russia
| | - V A Mitkevich
- Engelhardt Institute of Molecular Biology Russian Academy of Sciences, Moscow, 119991 Russia
| | - A A Makarov
- Engelhardt Institute of Molecular Biology Russian Academy of Sciences, Moscow, 119991 Russia
| | - I Y Petrushanko
- Engelhardt Institute of Molecular Biology Russian Academy of Sciences, Moscow, 119991 Russia.,
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19
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Gianfrancesco MA, Dehairs J, L'homme L, Herinckx G, Esser N, Jansen O, Habraken Y, Lassence C, Swinnen JV, Rider MH, Piette J, Paquot N, Legrand-Poels S. Saturated fatty acids induce NLRP3 activation in human macrophages through K + efflux resulting from phospholipid saturation and Na, K-ATPase disruption. Biochim Biophys Acta Mol Cell Biol Lipids 2019; 1864:1017-30. [PMID: 30953761 DOI: 10.1016/j.bbalip.2019.04.001] [Citation(s) in RCA: 51] [Impact Index Per Article: 10.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/23/2018] [Revised: 12/20/2018] [Accepted: 01/06/2019] [Indexed: 12/29/2022]
Abstract
NLRP3 inflammasome plays a key role in Western diet-induced systemic inflammation and was recently shown to mediate long-lasting trained immunity in myeloid cells. Saturated fatty acids (SFAs) are sterile triggers able to induce the assembly of the NLRP3 inflammasome in macrophages, leading to IL-1β secretion while unsaturated ones (UFAs) prevent SFAs-mediated NLRP3 activation. Unlike previous studies using LPS-primed bone marrow derived macrophages, we do not see any ROS or IRE-1α involvement in SFAs-mediated NLRP3 activation in human monocytes-derived macrophages. Rather we show that SFAs need to enter the cells and to be activated into acyl-CoA to lead to NLRP3 activation in human macrophages. However, their β-oxidation is dispensable. Instead, they are channeled towards phospholipids but redirected towards lipid droplets containing triacylglycerol in the presence of UFAs. Lipidomic analyses and Laurdan fluorescence experiments demonstrate that SFAs induce a dramatic saturation of phosphatidylcholine (PC) correlated with a loss of membrane fluidity, both events inhibited by UFAs. The silencing of CCTα, the key enzyme in PC synthesis, prevents SFA-mediated NLRP3 activation, demonstrating the essential role of the de novo PC synthesis. This SFA-induced membrane remodeling promotes a disruption of the plasma membrane Na, K-ATPase, instigating a K+ efflux essential and sufficient for NLRP3 activation. This work opens novel therapeutic avenues to interfere with Western diet-associated diseases such as those targeting the glycerolipid pathway.
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20
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Mayan H, Farfel Z, Karlish SJD. Renal Mg handling, FXYD2 and the central role of the Na, K-ATPase. Physiol Rep 2018; 6:e13843. [PMID: 30175537 PMCID: PMC6119663 DOI: 10.14814/phy2.13843] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/29/2018] [Revised: 07/30/2018] [Accepted: 08/01/2018] [Indexed: 12/15/2022] Open
Abstract
This article examines the central role of Na,K-ATPase (α1β1FXYD2) in renal Mg handling, especially in distal convoluted tubule (DCT), the segment responsible for final regulation of Mg balance. By considering effects of Na,K-ATPase on intracellular Na and K concentrations, and driving forces for Mg transport, we propose a consistent rationale explaining basal Mg reabsorption in DCT and altered Mg reabsorption in some human diseases. FXYD2 (γ subunit) is a regulatory subunit that adapts functional properties of Na,K-ATPase to cellular requirements. Mutations in FXYD2 (G41R), and transcription factors (HNF-1B and PCBD1) that affect FXYD2 expression are associated with hypomagnesemia with hypermagnesuria. These mutations result in impaired interactions of FXYD2 with Na,K-ATPase. Renal Mg wasting implies that Na,K-ATPase is inhibited, but in vitro studies show that FXYD2 itself inhibits Na,K-ATPase activity, raising K0.5 Na. However, FXYD2 also stabilizes the protein by amplifying specific interactions with phosphatidylserine and cholesterol within the membrane. Renal Mg wasting associated with impaired Na,K-ATPase/FXYD2 interactions is explained simply by destabilization and inactivation of Na,K-ATPase. We consider also the role of the Na,K-ATPase in Mg (and Ca) handling in Gitelman syndrome and Familial hyperkalemia and hypertension (FHHt). Renal Mg handling serves as a convenient marker for Na,K-ATPase activity in DCT.
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Affiliation(s)
- Haim Mayan
- Department of Medicine ESheba Medical CenterRamat GanIsrael
- Laboratory of Biochemical PharmacologySheba Medical CenterRamat GanIsrael
- Sackler School of MedicineTel Aviv UniversityTel AvivIsrael
| | - Zvi Farfel
- Department of Medicine ESheba Medical CenterRamat GanIsrael
- Laboratory of Biochemical PharmacologySheba Medical CenterRamat GanIsrael
- Sackler School of MedicineTel Aviv UniversityTel AvivIsrael
- Department of Biomolecular SciencesWeizmann Institute of ScienceRehovothIsrael
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21
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Xu J, Zhang Y, Guo X, Sun T. Glycogenolysis in Acquired Glioma Resistance to Temozolomide: A Role for the [Ca 2+] i-dependent Activation of Na, K-ATPase/ERK 1/2 Signaling. Front Pharmacol 2018; 9:873. [PMID: 30131700 PMCID: PMC6090282 DOI: 10.3389/fphar.2018.00873] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/03/2018] [Accepted: 07/19/2018] [Indexed: 01/25/2023] Open
Abstract
Understanding the mechanistic basis for temozolomide (TMZ)-induced glioma resistance is an important obstacle in developing an effective form of chemotherapy for this type of tumor. Glycogenolysis is known to play an essential role in cellular proliferation and potassium homeostasis and involves the glycogen phosphorylase isoenzyme BB (GPBB). In this investigation, plasma GPBB was correlated with TMZ-resistance. Elevated plasma GPBB concentrations were found to be more frequent in a TMZ-resistant cohort of patients with poor survival rates. TMZ inhibits cell proliferation and induces TMZ resistance by upregulating the expression of O(6)-methylguanine-DNA methyltransferase (MGMT). This process requires glycogenolysis, which was confirmed herein by treatment with 1,4-dideoxy-1,4-imino-D-arabinitol hydrochloride, a glycogenolysis inhibitor and a special GPBB inhibitor. Acute TMZ treatment leads to upregulation of [Ca2+]i, extracellular-regulated kinase (ERK)1/2 phosphorylation, and chronic TMZ treatment leads to upregulation of the expression of Na,K-ATPase, ERK1/2, and MGMT protein. Upregulation was abolished for each of these by inhibitors of transient receptor potential channel 1 and the inositol trisphosphate receptor. L-channel [Ca2+]i inhibitors and RyR antagonists had no such effect. These results demonstrate that [Ca2+]i-dependent glycogenolysis participates in acquired glioma TMZ-resistance by upregulating MGMT via a Na,K-ATPase/ERK1/2 signaling pathway. GPBB and glycogenolysis may therefore represent novel therapeutic targets for overcoming TMZ-resistant gliomas.
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Affiliation(s)
- Junnan Xu
- Department of Medical Oncology, Cancer Hospital of China Medical University, Liaoning Cancer Hospital & Institute, Shenyang, China.,Department of Medical Oncology, Key Laboratory of Liaoning Breast Cancer Research, Shenyang, China
| | - Ye Zhang
- Department of Neurosurgery, Cancer Hospital of China Medical University, Liaoning Cancer Hospital & Institute, Shenyang, China
| | - Xiangyu Guo
- Department of Medical Oncology, Cancer Hospital of China Medical University, Liaoning Cancer Hospital & Institute, Shenyang, China
| | - Tao Sun
- Department of Medical Oncology, Cancer Hospital of China Medical University, Liaoning Cancer Hospital & Institute, Shenyang, China
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22
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Methenitis S, Stasinaki AN, Zaras N, Spengos K, Karandreas N, Terzis G. Intramuscular fibre conduction velocity and muscle fascicle length in human vastus lateralis. Appl Physiol Nutr Metab 2018; 44:133-138. [PMID: 30011376 DOI: 10.1139/apnm-2018-0081] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
Muscle fascicle length and muscle fibre conduction velocity (MFCV) are thought to be important parameters for power performance. It might be expected that faster muscle fibre conduction velocities would compensate for longer fascicle lengths to increase the speed of action potential propagation along the elongated fibres. However, the relationship between muscle fascicle length and MFCV remains unknown. The aim of the present study was to explore the relationship between average vastus lateralis MFCV and average fascicle length. In 17 moderately trained, healthy, male, physical education students (age, 23.4 ± 3.1 years; body height, 178 ± 5.5 cm; body mass, 82.7 ± 6.9 kg; body mass index, 24.6 ± 1.5 kg·m-2) resting MFCV was measured with intramuscular microelectrodes while muscle architecture was evaluated with ultrasonography. Fascicle length was highly correlated with total MFCV (r = 0.923, p = 0.000), maximum MFCV (r = 0.949, p = 0.000), and MFCV of the fastest (r = 0.709, p = 0.001), but not of the slowest fibres (r = 0.131, p = 0.616). No significant correlations were also found between vastus lateralis thickness or fascicle angle with any of MFCV parameters (r = 0.145-0.430; R2 < 0.130; p > 0.05). These data indicate that average MFCV is associated with average fascicle length in vastus lateralis muscle in different individuals. It seems that participants with longer fascicle lengths have also higher MFCVs.
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Affiliation(s)
- Spyridon Methenitis
- a Sports Performance Laboratory, School of Physical Education and Sports Science, National and Kapodistrian University of Athens, Ethnikis Antistassis 41, 172 37, Daphne, Athens, Greece
| | - Angeliki-Nikoletta Stasinaki
- a Sports Performance Laboratory, School of Physical Education and Sports Science, National and Kapodistrian University of Athens, Ethnikis Antistassis 41, 172 37, Daphne, Athens, Greece
| | - Nikolaos Zaras
- a Sports Performance Laboratory, School of Physical Education and Sports Science, National and Kapodistrian University of Athens, Ethnikis Antistassis 41, 172 37, Daphne, Athens, Greece
| | - Konstantinos Spengos
- b A' Neurology Clinic, Aiginition Hospital, Medical School, National and Kapodistrian University of Athens, Ethnikis Antistassis 41, 172 37, Daphne, Athens, Greece
| | - Nikolaos Karandreas
- b A' Neurology Clinic, Aiginition Hospital, Medical School, National and Kapodistrian University of Athens, Ethnikis Antistassis 41, 172 37, Daphne, Athens, Greece
| | - Gerasimos Terzis
- a Sports Performance Laboratory, School of Physical Education and Sports Science, National and Kapodistrian University of Athens, Ethnikis Antistassis 41, 172 37, Daphne, Athens, Greece
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23
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Ding B, Walton JP, Zhu X, Frisina RD. Age-related changes in Na, K-ATPase expression, subunit isoform selection and assembly in the stria vascularis lateral wall of mouse cochlea. Hear Res 2018; 367:59-73. [PMID: 30029086 DOI: 10.1016/j.heares.2018.07.006] [Citation(s) in RCA: 23] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/14/2017] [Revised: 07/02/2018] [Accepted: 07/06/2018] [Indexed: 11/26/2022]
Abstract
Due to the critical role of cochlear ion channels for hearing, the focus of the present study was to examine age-related changes of Na, K-ATPase (NKA) subunits in the lateral wall of mouse cochlea. We combined qRT-PCR, western blot and immunocytochemistry methodologies in order to determine gene and protein expression levels in the lateral wall of young and aged CBA/CaJ mice. Of the seven NKA subunits, only the mRNA expressions of α1, β1 and β2 subunit isoforms were detected in the lateral wall of CBA/CaJ mice. Aging was accompanied by dys-regulation of gene and protein expression of all three subunits detected. Hematoxylin and eosin (H&E) staining revealed atrophy of the cochlear stria vascularis (SV). The SV atrophy rate (20%) was much less than the ∼80% decline in expression of all three NKA isoforms, indicating lateral wall atrophy and NKA dys-regulation are independent factors and that there is a combination of changes involving the morphology of SV and NKA expression in the aging cochlea which may concomitantly affect cochlear function. Immunoprecipitation assays showed that the α1-β1 heterodimer is the selective preferential heterodimer over the α1-β2 heterodimer in cochlea lateral wall. Interestingly, in vitro pathway experiments utilizing cultured mouse cochlear marginal cells from the SV (SV-K1 cells) indicated that decreased mRNA and protein expressions of α1, β1 and β2 subunit isoforms are not associated with reduction of NKA activity following in vitro application of ouabain, but ouabain did disrupt the α1-β1 heterodimer interaction. Lastly, the association between the α1 and β1 subunit isoforms was present in the cochlear lateral wall of young adult mice, but this interaction could not be detected in old mice. Taken together, these data suggest that in the young adult mouse there is a specific, functional selection and assembly of NKA subunit isoforms in the SV lateral wall, which is disrupted and dys-regulated with age. Interventions for this age-linked ion channel disruption may have the potential to help diagnose, prevent, or treat age-related hearing loss.
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Affiliation(s)
- Bo Ding
- Dept. Communication Sciences & Disorders, Global Center for Hearing & Speech Research, University of South Florida, Tampa, FL, USA
| | - Joseph P Walton
- Dept. Communication Sciences & Disorders, Global Center for Hearing & Speech Research, University of South Florida, Tampa, FL, USA; Dept. Chemical & Biomedical Engineering, Global Center for Hearing & Speech Research, University of South Florida, Tampa, FL, USA.
| | - Xiaoxia Zhu
- Dept. Chemical & Biomedical Engineering, Global Center for Hearing & Speech Research, University of South Florida, Tampa, FL, USA
| | - Robert D Frisina
- Dept. Communication Sciences & Disorders, Global Center for Hearing & Speech Research, University of South Florida, Tampa, FL, USA; Dept. Chemical & Biomedical Engineering, Global Center for Hearing & Speech Research, University of South Florida, Tampa, FL, USA; Dept. Medical Engineering, Global Center for Hearing & Speech Research, University of South Florida, Tampa, FL, USA
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24
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Dergousova EA, Petrushanko IY, Klimanova EA, Mitkevich VA, Ziganshin RH, Lopina OD, Makarov AA. [Enhancement of Na, K-ATPase Activity as a Result of Removal of Redox Modifications from Cysteine Residues of the al Subunit: the Effect of Reducing Agents]. Mol Biol (Mosk) 2018; 52:289-293. [PMID: 29695697 DOI: 10.7868/s002689841802012x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/30/2016] [Accepted: 12/06/2016] [Indexed: 11/23/2022]
Abstract
Na,K-ATPase is a transmembrane enzyme that creates a gradient of sodium and potassium, which is necessary for the viability of animal cells. The activity of Na,K-ATPase depends on the redox status of the cell, decreasing with oxidative stress and hypoxia. Previously, we have shown that the key role in the redox sensitivity of Na,K-ATPase is played by the regulatory glutathionylation of cysteine residues of the catalytic alpha subunit, which leads to the inhibition of the enzyme. In this study, the effect of reducing agents (DTT, ME, TCEP) on the level of glutathionylation of the alpha subunit of Na,K-ATPase from rabbit kidneys and the enzyme activity has been evaluated. We have found that the reducing agents partially deglutathionylate the protein, which leads to its activation. It was impossible to completely remove glutathionylation from the native rabbit kidney protein. The treatment of a partially denatured protein on the PVDF membrane with reducing agents (TCEP, NaBH4) also does not lead to the complete deglutathionylation of the protein. The obtained data indicate that Na,K-ATPase isolated from rabbit kidneys has both regulatory and basal glutathionylation, which appears to play an important role in the redox regulation of the function of Na, K-ATPase in mammalian tissues.
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Affiliation(s)
- E A Dergousova
- Engelhardt Institute of Molecular Biology, Russian Academy of Sciences, Moscow, 119991 Russia.,Faculty of Biology, Moscow State University, Moscow, 119991 Russia
| | - I Yu Petrushanko
- Engelhardt Institute of Molecular Biology, Russian Academy of Sciences, Moscow, 119991 Russia
| | - E A Klimanova
- Engelhardt Institute of Molecular Biology, Russian Academy of Sciences, Moscow, 119991 Russia.,Faculty of Biology, Moscow State University, Moscow, 119991 Russia
| | - V A Mitkevich
- Engelhardt Institute of Molecular Biology, Russian Academy of Sciences, Moscow, 119991 Russia
| | - R H Ziganshin
- Shemyakin-Ovchinnikov Institute of Bioorganic Chemistry, Russian Academy of Sciences, Moscow, 117997 Russia
| | - O D Lopina
- Engelhardt Institute of Molecular Biology, Russian Academy of Sciences, Moscow, 119991 Russia.,Faculty of Biology, Moscow State University, Moscow, 119991 Russia
| | - A A Makarov
- Engelhardt Institute of Molecular Biology, Russian Academy of Sciences, Moscow, 119991 Russia.,
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25
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Petrushanko IY, Mitkevich VA, Lakunina VA, Anashkina AA, Spirin PV, Rubtsov PM, Prassolov VS, Bogdanov NB, Hänggi P, Fuller W, Makarov AA, Bogdanova A. Cysteine residues 244 and 458-459 within the catalytic subunit of Na, K-ATPase control the enzyme's hydrolytic and signaling function under hypoxic conditions. Redox Biol 2017; 13:310-319. [PMID: 28601781 PMCID: PMC5470536 DOI: 10.1016/j.redox.2017.05.021] [Citation(s) in RCA: 21] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/11/2017] [Revised: 03/16/2017] [Accepted: 05/26/2017] [Indexed: 12/21/2022] Open
Abstract
Our previous findings suggested that reversible thiol modifications of cysteine residues within the actuator (AD) and nucleotide binding domain (NBD) of the Na,K-ATPase may represent a powerful regulatory mechanism conveying redox- and oxygen-sensitivity of this multifunctional enzyme. S-glutathionylation of Cys244 in the AD and Cys 454-458-459 in the NBD inhibited the enzyme and protected cysteines' thiol groups from irreversible oxidation under hypoxic conditions. In this study mutagenesis approach was used to assess the role these cysteines play in regulation of the Na,K-ATPase hydrolytic and signaling functions. Several constructs of mouse α1 subunit of the Na,K-ATPase were produced in which Cys244, Cys 454-458-459 or Cys 244-454-458-459 were replaced by alanine. These constructs were expressed in human HEK293 cells. Non-transfected cells and those expressing murine α1 subunit were exposed to hypoxia or treated with oxidized glutathione (GSSG). Both conditions induced inhibition of the wild type Na,K-ATPase. Enzymes containing mutated mouse α1 lacking Cys244 or all four cysteines (Cys 244-454-458-459) were insensitive to hypoxia. Inhibitory effect of GSSG was observed for wild type murine Na,K-ATPase, but was less pronounced in Cys454-458-459Ala mutant and completely absent in the Cys244Ala and Cys 244-454-458-459Ala mutants. In cells, expressing wild type enzyme, ouabain induced activation of Src and Erk kinases under normoxic conditions, whereas under hypoxic conditions this effect was inversed. Cys454-458-459Ala substitution abolished Src kinase activation in response to ouabain treatment, uncoupled Src from Erk signaling, and interfered with O2-sensitivity of Na,K-ATPase signaling function. Moreover, modeling predicted that S-glutathionylation of Cys 458 and 459 should prevent inhibitory binding of Src to NBD. Our data indicate for the first time that cysteine residues within the AD and NBD influence hydrolytic as well as receptor function of the Na,K-ATPase and alter responses of the enzyme to hypoxia or upon treatment with cardiotonic steroids.
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Affiliation(s)
- Irina Yu Petrushanko
- Engelhardt Institute of Molecular Biology, Russian Academy of Sciences, Moscow, Russia
| | - Vladimir A Mitkevich
- Engelhardt Institute of Molecular Biology, Russian Academy of Sciences, Moscow, Russia
| | - Valentina A Lakunina
- Engelhardt Institute of Molecular Biology, Russian Academy of Sciences, Moscow, Russia
| | - Anastasia A Anashkina
- Engelhardt Institute of Molecular Biology, Russian Academy of Sciences, Moscow, Russia
| | - Pavel V Spirin
- Engelhardt Institute of Molecular Biology, Russian Academy of Sciences, Moscow, Russia
| | - Peter M Rubtsov
- Engelhardt Institute of Molecular Biology, Russian Academy of Sciences, Moscow, Russia
| | - Vladimir S Prassolov
- Engelhardt Institute of Molecular Biology, Russian Academy of Sciences, Moscow, Russia
| | - Nikolay B Bogdanov
- Institute of Veterinary Physiology, Vetsuisse Faculty and the Zurich Center for Integrative Human Physiology (ZIHP), University of Zurich, Zurich, Switzerland
| | - Pascal Hänggi
- Institute of Veterinary Physiology, Vetsuisse Faculty and the Zurich Center for Integrative Human Physiology (ZIHP), University of Zurich, Zurich, Switzerland
| | - William Fuller
- Cardiovascular and Diabetes Medicine, School of Medicine, University of Dundee, Dundee, UK
| | - Alexander A Makarov
- Engelhardt Institute of Molecular Biology, Russian Academy of Sciences, Moscow, Russia
| | - Anna Bogdanova
- Institute of Veterinary Physiology, Vetsuisse Faculty and the Zurich Center for Integrative Human Physiology (ZIHP), University of Zurich, Zurich, Switzerland.
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26
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Abstract
The sodium and potassium gradients across the plasma membrane are used by animal cells for numerous processes, and the range of demands requires that the responsible ion pump, the Na,K-ATPase, can be fine-tuned to the different cellular needs. Therefore, several isoforms are expressed of each of the three subunits that make a Na,K-ATPase, the alpha, beta and FXYD subunits. This review summarizes the various roles and expression patterns of the Na,K-ATPase subunit isoforms and maps the sequence variations to compare the differences structurally. Mutations in the Na,K-ATPase genes encoding alpha subunit isoforms have severe physiological consequences, causing very distinct, often neurological diseases. The differences in the pathophysiological effects of mutations further underline how the kinetic parameters, regulation and proteomic interactions of the Na,K-ATPase isoforms are optimized for the individual cellular needs.
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Affiliation(s)
- Michael V Clausen
- Department of Molecular Biology and Genetics, Aarhus UniversityAarhus, Denmark
| | - Florian Hilbers
- Department of Molecular Biology and Genetics, Aarhus UniversityAarhus, Denmark
| | - Hanne Poulsen
- Department of Molecular Biology and Genetics, Aarhus UniversityAarhus, Denmark
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27
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Montes MR, Ferreira-Gomes MS, Centeno M, Rossi RC. The E2P-like state induced by magnesium fluoride complexes in the Na,K-ATPase. Kinetics of formation and interaction with Rb(+). Biochim Biophys Acta 2015; 1848:1514-23. [PMID: 25838127 DOI: 10.1016/j.bbamem.2015.03.023] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Subscribe] [Scholar Register] [Received: 12/05/2014] [Revised: 03/19/2015] [Accepted: 03/23/2015] [Indexed: 11/24/2022]
Abstract
The first X-ray crystal structures of the Na,K-ATPase were obtained in the presence of magnesium and fluoride as E2(K2)Mg-MgF4, an E2∙Pi-like state capable to occlude K(+) (or Rb(+)). This work presents a functional characterization of the crystallized form of the enzyme and proposes a model to explain the interaction between magnesium, fluoride and Rb(+) with the Na,K-ATPase. We studied the effect of magnesium and magnesium fluoride complexes on the E1-E2 conformational transition and the kinetics of Rb(+) exchange between the medium and the E2(Rb2)Mg-MgF4 state. Our results show that both in the absence and in the presence of Rb(+), simultaneous addition of magnesium and fluoride stabilizes the Na,K-ATPase in an E2 conformation, presumably the E2Mg-MgF4 complex, that is unable to shift to E1 upon addition of Na(+). The time course of conformational change suggests the action of fluoride and magnesium at different steps of the E2Mg-MgF4 formation. Increasing concentrations of fluoride revert along a sigmoid curve the drop in the level of occluded Rb(+) caused by Mg(2+). Na(+)-induced release of Rb(+) from E2(Rb2)Mg-MgF4 occurs at the same rate as from E2(Rb2) but is insensitive to ADP. The rate of Rb(+) occlusion into the E2Mg-MgF4 state is 5-8 times lower than that described for the E2Mg-vanadate complex. Since the E2Mg-MgF4 and E2Mg-vanadate complexes represent different intermediates in the E2-P→E2 dephosphorylation sequence, the variation in occlusion rate could provide a tool to discriminate between these intermediates.
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Affiliation(s)
- Mónica R Montes
- Instituto de Química y Fisicoquímica Biológicas and Departamento de Química Biológica, Facultad de Farmacia y Bioquímica, Universidad de Buenos Aires, Junín 956, 1113 Buenos Aires, Argentina.
| | - Mariela S Ferreira-Gomes
- Instituto de Química y Fisicoquímica Biológicas and Departamento de Química Biológica, Facultad de Farmacia y Bioquímica, Universidad de Buenos Aires, Junín 956, 1113 Buenos Aires, Argentina
| | - Mercedes Centeno
- Instituto de Química y Fisicoquímica Biológicas and Departamento de Química Biológica, Facultad de Farmacia y Bioquímica, Universidad de Buenos Aires, Junín 956, 1113 Buenos Aires, Argentina
| | - Rolando C Rossi
- Instituto de Química y Fisicoquímica Biológicas and Departamento de Química Biológica, Facultad de Farmacia y Bioquímica, Universidad de Buenos Aires, Junín 956, 1113 Buenos Aires, Argentina
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28
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Paciorkowski AR, McDaniel SS, Jansen LA, Tully H, Tuttle E, Ghoneim DH, Tupal S, Gunter SA, Vasta V, Zhang Q, Tran T, Liu YB, Ozelius LJ, Brashear A, Sweadner KJ, Dobyns WB, Hahn S. Novel mutations in ATP1A3 associated with catastrophic early life epilepsy, episodic prolonged apnea, and postnatal microcephaly. Epilepsia 2015; 56:422-30. [PMID: 25656163 DOI: 10.1111/epi.12914] [Citation(s) in RCA: 93] [Impact Index Per Article: 10.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 12/10/2014] [Indexed: 11/30/2022]
Abstract
OBJECTIVE Mutations of ATP1A3 have been associated with rapid onset dystonia-parkinsonism and more recently with alternating hemiplegia of childhood. Here we report one child with catastrophic early life epilepsy and shortened survival, and another with epilepsy, episodic prolonged apnea, postnatal microcephaly, and severe developmental disability. Novel heterozygous mutations (p.Gly358Val and p.Ile363Asn) were identified in ATP1A3 in these children. METHODS Subjects underwent next-generation sequencing under a research protocol. Clinical data were collected retrospectively. The biochemical effects of the mutations on ATP1A3 protein function were investigated. Postmortem neuropathologic specimens from control and affected subjects were studied. RESULTS The mutations localized to the P domain of the Na,K-ATPase α3 protein, and resulted in significant reduction of Na,K-ATPase activity in vitro. We demonstrate in both control human brain tissue and that from the subject with the p.Gly358Val mutation that ATP1A3 immunofluorescence is prominently associated with interneurons in the cortex, which may provide some insight into the pathogenesis of the disease. SIGNIFICANCE The findings indicate these mutations cause severe phenotypes of ATP1A3-related disorder spectrum that include catastrophic early life epilepsy, episodic apnea, and postnatal microcephaly.
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Affiliation(s)
- Alex R Paciorkowski
- Departments of Neurology, Pediatrics, and Biomedical Genetics, University of Rochester Medical Center, Rochester, New York, U.S.A; Center for Neural Development and Disease, University of Rochester Medical Center, Rochester, New York, U.S.A
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29
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Amaral FG, Turati AO, Barone M, Scialfa JH, do Carmo Buonfiglio D, Peres R, Peliciari-Garcia RA, Afeche SC, Lima L, Scavone C, Bordin S, Reiter RJ, Menna-Barreto L, Cipolla-Neto J. Melatonin synthesis impairment as a new deleterious outcome of diabetes-derived hyperglycemia. J Pineal Res 2014; 57:67-79. [PMID: 24819547 DOI: 10.1111/jpi.12144] [Citation(s) in RCA: 46] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/02/2014] [Accepted: 05/09/2014] [Indexed: 01/13/2023]
Abstract
Melatonin is a neurohormone that works as a nighttime signal for circadian integrity and health maintenance. It is crucial for energy metabolism regulation, and the diabetes effects on its synthesis are unresolved. Using diverse techniques that included pineal microdialysis and ultrahigh-performance liquid chromatography, the present data show a clear acute and sustained melatonin synthesis reduction in diabetic rats as a result of pineal metabolism impairment that is unrelated to cell death. Hyperglycemia is the main cause of several diabetic complications, and its consequences in terms of melatonin production were assessed. Here, we show that local high glucose (HG) concentration is acutely detrimental to pineal melatonin synthesis in rats both in vivo and in vitro. The clinically depressive action of high blood glucose concentration in melatonin levels was also observed in type 1 diabetes patients who presented a negative correlation between hyperglycemia and 6-sulfatoxymelatonin excretion. Additionally, high-mean-glycemia type 1 diabetes patients presented lower 6-sulfatoxymelatonin levels when compared to control subjects. Although further studies are needed to fully clarify the mechanisms, the present results provide evidence that high circulating glucose levels interfere with pineal melatonin production. Given the essential role played by melatonin as a powerful antioxidant and in the control of energy homeostasis, sleep and biological rhythms and knowing that optimal glycemic control is usually an issue for patients with diabetes, melatonin supplementation may be considered as an additional tool to the current treatment.
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Affiliation(s)
- Fernanda G Amaral
- Laboratory of Neurobiology, Department of Physiology and Biophysics, Institute of Biomedical Sciences, University of São Paulo, São Paulo, SP, Brazil
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Song D, Du T. Ammonium activates ouabain-activated signalling pathway in astrocytes: therapeutic potential of ouabain antagonist. Curr Neuropharmacol 2014; 12:334-41. [PMID: 25342941 PMCID: PMC4207073 DOI: 10.2174/1570159x12666140828222115] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/29/2014] [Revised: 06/18/2014] [Accepted: 06/25/2014] [Indexed: 01/16/2023] Open
Abstract
The causal role of ammonium in hepatic encephalopathy was identified in 1930s. Astroglial cells are primary cellular elements of hepatic encephalopathy which conceptually, can be considered a toxic astrogliopathology. Previously we have reported that acute exposure to ammonium activated ouabain/Na,K-ATPase signalling pathway, which includes Src, EGF receptor, Raf, Ras, MEK and ERK1/2. Chronic incubation of astrocytes with ammonium increased production of endogenous ouabain-like compound. Ouabain antagonist canrenone abolished effects of ammonium on astrocytic swelling, ROS production, and upregulation of gene expression and function of TRPC1 and Cav1.2. However, ammonium induces multiple pathological modifications in astrocytes, and some of them may be not related to this signalling pathway. In this review, we focus on the effect of ammonium on ouabain/Na,K-ATPase signalling pathway and its involvement in ammonium-induced ROS production, cell swelling and aberration of Ca(2+) signals in astrocytes. We also briefly discuss Na,K-ATPase, EGF receptor, endogenous ouabain and ouabain antagonist.
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Affiliation(s)
- Dan Song
- Laboratory of Brain Metabolic Diseases, Institute of Metabolic Disease Research and Drug Development, China Medical University, Shenyang, P. R. China
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Brignone MS, Lanciotti A, Visentin S, De Nuccio C, Molinari P, Camerini S, Diociaiuti M, Petrini S, Minnone G, Crescenzi M, Laudiero LB, Bertini E, Petrucci TC, Ambrosini E. Megalencephalic leukoencephalopathy with subcortical cysts protein-1 modulates endosomal pH and protein trafficking in astrocytes: relevance to MLC disease pathogenesis. Neurobiol Dis 2014; 66:1-18. [PMID: 24561067 PMCID: PMC4003525 DOI: 10.1016/j.nbd.2014.02.003] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/25/2013] [Revised: 01/20/2014] [Accepted: 02/10/2014] [Indexed: 11/28/2022] Open
Abstract
Megalencephalic leukoencephalopathy with subcortical cysts (MLC) is a rare leukodystrophy caused by mutations in the gene encoding MLC1, a membrane protein mainly expressed in astrocytes in the central nervous system. Although MLC1 function is unknown, evidence is emerging that it may regulate ion fluxes. Using biochemical and proteomic approaches to identify MLC1 interactors and elucidate MLC1 function we found that MLC1 interacts with the vacuolar ATPase (V-ATPase), the proton pump that regulates endosomal acidity. Because we previously showed that in intracellular organelles MLC1 directly binds Na, K-ATPase, which controls endosomal pH, we studied MLC1 endosomal localization and trafficking and MLC1 effects on endosomal acidity and function using human astrocytoma cells overexpressing wild-type (WT) MLC1 or MLC1 carrying pathological mutations. We found that WT MLC1 is abundantly expressed in early (EEA1(+), Rab5(+)) and recycling (Rab11(+)) endosomes and uses the latter compartment to traffic to the plasma membrane during hyposmotic stress. We also showed that WT MLC1 limits early endosomal acidification and influences protein trafficking in astrocytoma cells by stimulating protein recycling, as revealed by FITC-dextran measurement of endosomal pH and transferrin protein recycling assay, respectively. WT MLC1 also favors recycling to the plasma-membrane of the TRPV4 cation channel which cooperates with MLC1 to activate calcium influx in astrocytes during hyposmotic stress. Although MLC disease-causing mutations differentially affect MLC1 localization and trafficking, all the mutated proteins fail to influence endosomal pH and protein recycling. This study demonstrates that MLC1 modulates endosomal pH and protein trafficking suggesting that alteration of these processes contributes to MLC pathogenesis.
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Affiliation(s)
- Maria S Brignone
- Department of Cell Biology and Neuroscience, Istituto Superiore di Sanità, Viale Regina Elena 299, 00161 Rome, Italy.
| | - Angela Lanciotti
- Department of Cell Biology and Neuroscience, Istituto Superiore di Sanità, Viale Regina Elena 299, 00161 Rome, Italy.
| | - Sergio Visentin
- Department of Cell Biology and Neuroscience, Istituto Superiore di Sanità, Viale Regina Elena 299, 00161 Rome, Italy.
| | - Chiara De Nuccio
- Department of Cell Biology and Neuroscience, Istituto Superiore di Sanità, Viale Regina Elena 299, 00161 Rome, Italy.
| | - Paola Molinari
- Department of Pharmacology, Istituto Superiore di Sanità, Viale Regina Elena 299, 00161 Rome, Italy.
| | - Serena Camerini
- Department of Cell Biology and Neuroscience, Istituto Superiore di Sanità, Viale Regina Elena 299, 00161 Rome, Italy.
| | - Marco Diociaiuti
- Department of Technology and Health, Istituto Superiore di Sanità, Viale Regina Elena 299, 00161 Rome, Italy.
| | - Stefania Petrini
- Unit of Neurodegenerative Disorders, Laboratory of Molecular Medicine, Bambino Gesù Pediatric Research Hospital, Piazza S. Onofrio 4, 00165 Rome, Italy.
| | - Gaetana Minnone
- Unit of Neurodegenerative Disorders, Laboratory of Molecular Medicine, Bambino Gesù Pediatric Research Hospital, Piazza S. Onofrio 4, 00165 Rome, Italy.
| | - Marco Crescenzi
- Department of Cell Biology and Neuroscience, Istituto Superiore di Sanità, Viale Regina Elena 299, 00161 Rome, Italy.
| | - Luisa Bracci Laudiero
- Unit of Neurodegenerative Disorders, Laboratory of Molecular Medicine, Bambino Gesù Pediatric Research Hospital, Piazza S. Onofrio 4, 00165 Rome, Italy; Institute of Translational Pharmacology, CNR, Via del Fosso Cavaliere 100, 00133 Rome, Italy.
| | - Enrico Bertini
- Unit of Neurodegenerative Disorders, Laboratory of Molecular Medicine, Bambino Gesù Pediatric Research Hospital, Piazza S. Onofrio 4, 00165 Rome, Italy.
| | - Tamara C Petrucci
- Department of Cell Biology and Neuroscience, Istituto Superiore di Sanità, Viale Regina Elena 299, 00161 Rome, Italy.
| | - Elena Ambrosini
- Department of Cell Biology and Neuroscience, Istituto Superiore di Sanità, Viale Regina Elena 299, 00161 Rome, Italy.
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Gong XM, Ding Y, Yu J, Yao Y, Marassi FM. Structure of the Na, K-ATPase regulatory protein FXYD2b in micelles: implications for membrane-water interfacial arginines. Biochim Biophys Acta 2014; 1848:299-306. [PMID: 24794573 DOI: 10.1016/j.bbamem.2014.04.021] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/26/2014] [Revised: 04/19/2014] [Accepted: 04/23/2014] [Indexed: 01/06/2023]
Abstract
FXYD2 is a membrane protein responsible for regulating the function of the Na,K-ATPase in mammalian kidney epithelial cells. Here we report the structure of FXYD2b, one of two splice variants of the protein, determined by NMR spectroscopy in detergent micelles. Solid-state NMR characterization of the protein embedded in phospholipid bilayers indicates that several arginine side chains may be involved in hydrogen bond interactions with the phospholipid polar head groups. The structure and the NMR data suggest that FXYD2b could regulate the Na,K-ATPase by modulating the effective membrane surface electrostatics near the ion binding sites of the pump.
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Affiliation(s)
- Xiao-Min Gong
- Sanford-Burnham Medical Research Institute, 10901 North Torrey Pines Road, La Jolla, CA 92037, USA
| | - Yi Ding
- Sanford-Burnham Medical Research Institute, 10901 North Torrey Pines Road, La Jolla, CA 92037, USA
| | - Jinghua Yu
- Sanford-Burnham Medical Research Institute, 10901 North Torrey Pines Road, La Jolla, CA 92037, USA
| | - Yong Yao
- Sanford-Burnham Medical Research Institute, 10901 North Torrey Pines Road, La Jolla, CA 92037, USA
| | - Francesca M Marassi
- Sanford-Burnham Medical Research Institute, 10901 North Torrey Pines Road, La Jolla, CA 92037, USA.
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Degerman E, Rauch U, Göransson O, Lindberg S, Hultgårdh A, Magnusson M. Identification of new signaling components in the sensory epithelium of human saccule. Front Neurol 2011; 2:48. [PMID: 21886636 PMCID: PMC3153852 DOI: 10.3389/fneur.2011.00048] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/06/2011] [Accepted: 07/13/2011] [Indexed: 11/13/2022] Open
Abstract
OBJECTIVE To locate components and target proteins of relevance for the cAMP and cGMP signaling networks including cAMP and cGMP phosphodiesterases (PDEs), salt-inducible kinases (SIKs), subunits of Na+, K+-ATPases, and aquaporins (AQPs) in the human saccule. METHODS The human saccule was dissected out during the removal of vestibular schwannoma via the translabyrinthine approach and immediately fixed. Immunohistochemistry was performed using PDE, SIK, Na(+), K(+)-ATPase, and AQP antibodies. RESULTS PDEs selective for cAMP (PDE4A, PDE4D, and PDE8A) and cGMP (PDE9A) as well a dual specificity PDE (PDE10A) were detected in the sensory epithelium of the saccule. Furthermore, AQP2, 4, and 9, SIK1 and the α-1 subunit of the Na(+), K(+)-ATPase were detected. CONCLUSION cAMP and cGMP are important regulators of ion and water homeostasis in the inner ear. The identification of PDEs and SIK1 in the vestibular system offers new treatment targets for endolymphatic hydrops. Exactly how the PDEs are connected to SIK1 and the SIK1 substrate Na(+), K(+)-ATPase and to AQPs 2, 4, 9 remains to be elucidated. The dissection of the signaling networks utilizing these components and evaluating their roles will add new basic knowledge regarding inner ear physiology.
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Affiliation(s)
- Eva Degerman
- Section for Diabetes, Metabolism and Endocrinology, Department of Experimental Medical Sciences, Lund University Lund, Sweden
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