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Huang M, Wang X, Chen Y, Pessoa MT, Terrell KC, Zhang J, Tian J, Xie Z, Pierre SV, Cai L. Role of Na/K-ATPase α1 Caveolin-Binding Motif in Adipogenesis. Am J Physiol Cell Physiol 2024. [PMID: 38708522 DOI: 10.1152/ajpcell.00168.2024] [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] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/14/2024] [Accepted: 04/29/2024] [Indexed: 05/07/2024]
Abstract
Deficiencies in mice and in humans have brought to the fore the importance of the caveolar network in key aspects of adipocyte biology. The conserved N-terminal caveolin-binding motif (CBM) of the ubiquitous Na/K-ATPase (NKA) α1 isoform, which allows NKA/caveolin-1 (Cav1) interaction, influences NKA signaling and caveolar distribution. It has been shown to be critical for animal development and ontogenesis, as well as lineage-specific differentiation of human induced pluripotent stem cells (hiPSC). However, its role in postnatal adipogenesis has not been fully examined. Using a genetic approach to alter CBM in hiPSC-derived adipocytes (iAdi-mCBM) and in mice (mCBM), we investigated the regulatory function of NKA CBM signaling in adipogenesis. Seahorse XF cell metabolism analyses revealed impaired glycolysis and decreased ATP synthesis-coupled respiration in iAdi-mCBM. These metabolic dysfunctions were accompanied by evidence of extensive remodeling of the extracellular matrix (ECM), including increased collagen staining, overexpression of ECM marker genes, and heightened TGF-β signaling uncovered by RNAseq analysis. Rescue of mCBM by lentiviral delivery of WT NKA α1 or treatment of mCBM hiPSC with the TGF-β inhibitor SB431542 normalized ECM, suggesting that NKA CBM signaling integrity is required for adequate control of TGF-β signaling and ECM stiffness during adipogenesis. The physiological impact was revealed in mCBM male mice with reduced fat mass accompanied by histological and transcriptional evidence of elevated adipose fibrosis and decreased adipocyte size. Based on these findings, we propose that the genetic alteration of the NKA/Cav1 regulatory path uncovered in human iAdi leads to lipodystrophy in mice.
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Affiliation(s)
| | | | - Yiliang Chen
- Medicine, Medical College of Wisconsin, Milwaukee, WI, United States
| | | | | | - Jue Zhang
- Medical College of Wisconsin, United States
| | | | - Zijian Xie
- Marshall Institute for Interdisciplinary Research (MIIR), Marshall University, Huntington, West Virginia 25755, Huntington, United States
| | - Sandrine V Pierre
- Marshall Institute for Interdisciplinary Research, Marshall University, Huntington, West Virginia, United States
| | - Liquan Cai
- MIIR, Marshall University, Huntington, WV, United States
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2
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Silva AR, de Souza e Souza KFC, Souza TBD, Younes-Ibrahim M, Burth P, de Castro Faria Neto HC, Gonçalves-de-Albuquerque CF. The Na/K-ATPase role as a signal transducer in lung inflammation. Front Immunol 2024; 14:1287512. [PMID: 38299144 PMCID: PMC10827986 DOI: 10.3389/fimmu.2023.1287512] [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] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/01/2023] [Accepted: 12/26/2023] [Indexed: 02/02/2024] Open
Abstract
Acute respiratory distress syndrome (ARDS) is marked by damage to the capillary endothelium and alveolar epithelium following edema formation and cell infiltration. Currently, there are no effective treatments for severe ARDS. Pathologies such as sepsis, pneumonia, fat embolism, and severe trauma may cause ARDS with respiratory failure. The primary mechanism of edema clearance is the epithelial cells' Na/K-ATPase (NKA) activity. NKA is an enzyme that maintains the electrochemical gradient and cell homeostasis by transporting Na+ and K+ ions across the cell membrane. Direct injury on alveolar cells or changes in ion transport caused by infections decreases the NKA activity, loosening tight junctions in epithelial cells and causing edema formation. In addition, NKA acts as a receptor triggering signal transduction in response to the binding of cardiac glycosides. The ouabain (a cardiac glycoside) and oleic acid induce lung injury by targeting NKA. Besides enzymatic inhibition, the NKA triggers intracellular signal transduction, fostering proinflammatory cytokines production and contributing to lung injury. Herein, we reviewed and discussed the crucial role of NKA in edema clearance, lung injury, and intracellular signaling pathway activation leading to lung inflammation, thus putting the NKA as a protagonist in lung injury pathology.
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Affiliation(s)
- Adriana Ribeiro Silva
- Laboratório de Imunofarmacologia, Instituto Oswaldo Cruz, Fundação Oswaldo Cruz (FIOCRUZ), Rio de Janeiro, Brazil
| | | | - Thamires Bandeira De Souza
- Laboratório de Imunofarmacologia, Departamento de Ciências Fisiológicas, Universidade Federal do Estado do Rio de Janeiro, Rio de Janeiro, Brazil
- Departamento de Biologia Celular e Molecular, Instituto de Biologia, Universidade Federal Fluminense, Niterói, Brazil
| | - Mauricio Younes-Ibrahim
- Departamento de Medicina Interna, Faculdade de Ciências Médicas, Universidade do Estado do Rio de Janeiro, Rio de Janeiro, Brazil
| | - Patrícia Burth
- Departamento de Biologia Celular e Molecular, Instituto de Biologia, Universidade Federal Fluminense, Niterói, Brazil
| | | | - Cassiano Felippe Gonçalves-de-Albuquerque
- Laboratório de Imunofarmacologia, Instituto Oswaldo Cruz, Fundação Oswaldo Cruz (FIOCRUZ), Rio de Janeiro, Brazil
- Laboratório de Imunofarmacologia, Departamento de Ciências Fisiológicas, Universidade Federal do Estado do Rio de Janeiro, Rio de Janeiro, Brazil
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Dimitrov AG. Resting membrane state as an interplay of electrogenic transporters with various pumps. Pflugers Arch 2023; 475:1113-1128. [PMID: 37468808 DOI: 10.1007/s00424-023-02838-4] [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] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/05/2023] [Revised: 06/26/2023] [Accepted: 07/06/2023] [Indexed: 07/21/2023]
Abstract
In this study, a new idea that electrogenic transporters determine cell resting state is presented. The previous assumption was that pumps, especially the sodium one, determine it. The latter meets difficulties, because it violates the law of conservation of energy; also a significant deficit of pump activity is reported. The amount of energy carried by a single ATP molecule reflects the potential of the inner mitochondrial membrane, which is about -200 mV. If pumps enforce a resting membrane potential that is more than twice smaller, then the majority of energy stored in ATP would be dissipated by each pump turning. However, this problem could be solved if control is transferred from pumps to something else, e.g., electrogenic transporters. Then pumps would transfer the energy to the ionic gradient without losses, while the cell surface membrane potential would be associated with the reversal potential of some electrogenic transporters. A minimal scheme of this type would include a sodium-calcium exchanger as well as sodium and calcium pumps. However, note that calcium channels and pumps are positioned along both intracellular organelles and the surface membrane. Therefore, the above-mentioned scheme would involve them as well as possible intercellular communications. Such schemes where various kinds of pumps are assumed to work in parallel may explain, to a great extent, the slow turning rate of the individual members. Interaction of pumps and transporters positioned at distant biological membranes with various forms of energy transfer between them may thus result in hypoxic/reperfusion injury, different kinds of muscle fatigue, and nerve-glia interactions.
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Affiliation(s)
- A G Dimitrov
- Institute of Biophysics and Biomedical Engineering, Bulgarian Academy of Sciences, Acad. G. Bonchev Str., Bl. 105, 1113, Sofia, Bulgaria.
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Sibarov DA, Zhuravleva ZD, Ilina MA, Boikov SI, Stepanenko YD, Karelina TV, Antonov SM. Unveiling the Role of Cholesterol in Subnanomolar Ouabain Rescue of Cortical Neurons from Calcium Overload Caused by Excitotoxic Insults. Cells 2023; 12:2011. [PMID: 37566090 PMCID: PMC10417153 DOI: 10.3390/cells12152011] [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] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/12/2023] [Revised: 07/31/2023] [Accepted: 08/04/2023] [Indexed: 08/12/2023] Open
Abstract
Na/K-ATPase maintains transmembrane ionic gradients and acts as a signal transducer when bound to endogenous cardiotonic steroids. At subnanomolar concentrations, ouabain induces neuroprotection against calcium overload and apoptosis of neurons during excitotoxic stress. Here, the role of lipid rafts in interactions between Na/K-ATPase, sodium-calcium exchanger (NCX), and N-methy-D-aspartate receptors (NMDARs) was investigated. We analyzed 0.5-1-nanometer ouabain's effects on calcium responses and miniature post-synaptic current (mEPSCs) frequencies of cortical neurons during the action of NMDA in rat primary culture and brain slices. In both objects, ouabain attenuated NMDA-evoked calcium responses and prevented an increase in mEPSC frequency, while the cholesterol extraction by methyl-β-cyclodextrin prevented the effects. The data support the conclusions that (i) ouabain-induced inhibition of NMDA-elicited calcium response involves both pre- and post-synapse, (ii) the presence of astrocytes in the tripartite synapse is not critical for the ouabain effects, which are found to be similar in cell cultures and brain slices, and (iii) ouabain action requires the integrity of cholesterol-rich membrane microdomains in which the colocalization and functional interaction of NMDAR-transferred calcium influx, calcium extrusion by NCX, and Na/K-ATPase modulation of the exchanger occur. This regulation of the molecules by cardiotonic steroids may influence synaptic transmission, prevent excitotoxic neuronal death, and interfere with the pharmacological actions of neurological medicines.
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Affiliation(s)
| | | | | | | | | | | | - Sergei M. Antonov
- Sechenov Institute of Evolutionary Physiology and Biochemistry of the Russian Academy of Sciences, Torez pr. 44, 194223 Saint-Petersburg, Russia; (D.A.S.); (Z.D.Z.); (M.A.I.); (S.I.B.); (Y.D.S.); (T.V.K.)
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Sodhi K, Maxwell K, Yan Y, Liu J, Chaudhry MA, Xie Z, Shapiro JI. pNaKtide Inhibits Na/K-ATPase Signaling and Attenuates Obesity. J Clin Med Sci 2023; 7:1000238. [PMID: 38283397 PMCID: PMC10812088] [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] [Grants] [Figures] [Subscribe] [Scholar Register] [Indexed: 01/30/2024]
Abstract
Obesity is a growing public health crisis across the world and has been recognized as an underlying risk factor for metabolic syndrome. Growing evidence demonstrates the critical role of oxidative stress in the pathophysiological mechanisms of obesity and related metabolic dysfunction. As we have established previously that Na/K-ATPase can amplify oxidative stress signaling, we aimed to explore the effect of inhibition of this pathway on obesity phenotype using the peptide antagonist, pNaKtide. The experiments performed in murine preadipocytes showed the dose-dependent effect of pNaKtide in attenuating oxidant stress and lipid accumulation. Furthermore, these in vitro findings were confirmed in C57Bl6 mice fed a high-fat diet. Interestingly, pNaKtide could significantly reduce body weight, ameliorate systemic oxidative and inflammatory milieu and improve insulin sensitivity in obese mice. Hence the study demonstrates the therapeutic utility of pNaKtide as an inhibitor of Na/K-ATPase oxidant amplification signaling to alleviate obesity and associated comorbidities.
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Affiliation(s)
- Komal Sodhi
- Department of Medicine, Biomedical Science, and Surgery, Joan C. Edwards School of Medicine, Marshall University, Huntington, United States of America
| | - Kyle Maxwell
- Department of Medicine, Biomedical Science, and Surgery, Joan C. Edwards School of Medicine, Marshall University, Huntington, United States of America
| | - Yanling Yan
- Department of Medicine, Biomedical Science, and Surgery, Joan C. Edwards School of Medicine, Marshall University, Huntington, United States of America
| | - Jiang Liu
- Department of Medicine, Biomedical Science, and Surgery, Joan C. Edwards School of Medicine, Marshall University, Huntington, United States of America
| | - Muhammad A Chaudhry
- Department of Medicine, Biomedical Science, and Surgery, Joan C. Edwards School of Medicine, Marshall University, Huntington, United States of America
| | - Zijian Xie
- Department of Medicine, Biomedical Science, and Surgery, Joan C. Edwards School of Medicine, Marshall University, Huntington, United States of America
| | - Joseph I Shapiro
- Department of Medicine, Biomedical Science, and Surgery, Joan C. Edwards School of Medicine, Marshall University, Huntington, United States of America
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Gonçalves-de-Albuquerque CF, Cunha CMCD, Castro LVGD, Martins CDA, Barnese MRC, Burth P, Younes-Ibrahim M. Cellular Pathophysiology of Leptospirosis: Role of Na/K-ATPase. Microorganisms 2023; 11:1695. [PMID: 37512868 PMCID: PMC10383190 DOI: 10.3390/microorganisms11071695] [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: 04/01/2023] [Revised: 06/04/2023] [Accepted: 06/19/2023] [Indexed: 07/30/2023] Open
Abstract
Inada and Ido identified Leptospira sp. as the pathogen responsible for Weil's Disease in 1915. Later, it was confirmed that Leptospira causes leptospirosis. The host microorganism's interaction at the cellular level remained misunderstood for many years. Although different bacterial components have been isolated and purified, the complexity of the molecular interactions between these components and the host and the molecular mechanisms responsible for the systemic dysfunctions still needs to be fully unveiled. Leptospirosis affects virtually all animal species. Its cellular pathophysiology must involve a ubiquitous cellular mechanism in all eukaryotes. Na/K-ATPase is the molecular target of the leptospiral endotoxin (glycolipoprotein-GLP). Na/K-ATPase dysfunctions on different types of cells give rise to the organ disorders manifested in leptospirosis. Concomitantly, the development of a peculiar metabolic disorder characterized by dyslipidemia, with increased levels of circulating free fatty acids and an imbalance in the fatty acid/albumin molar ratio, triggers events of cellular lipotoxicity. Synergistically, multiple molecular stimuli are prompted during the infection, activating inflammasomes and Na/K-ATPase signalosome, leading to pro-inflammatory and metabolic alterations during leptospirosis. Leptospirosis involves diverse molecular mechanisms and alteration in patient inflammatory and metabolic status. Nonetheless, Na/K-ATPase is critical in the disease, and it is targeted by GLP, its components, and other molecules, such as fatty acids, that inhibit or trigger intracellular signaling through this enzyme. Herein, we overview the role of Na/K-ATPase during leptospirosis infection as a potential therapeutic target or an indicator of disease severity.
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Affiliation(s)
| | - Carolina Medina Coeli da Cunha
- Laboratory of Immunopharmacology, Department of Physiology, Federal University of the State of Rio de Janeiro (UNIRIO), Rio de Janeiro 20211-030, Brazil
- Neuroscience Graduate Program, Federal Fluminense University (UFF), Niteroi 24000-000, Brazil
| | | | - Caroline de Azevedo Martins
- School of Medicine and Surgery, Federal University of the State of Rio de Janeiro (UNIRIO), Rio de Janeiro 20270-901, Brazil
| | | | - Patrícia Burth
- Laboratory of Enzymology and Cellular Signaling, Department of Cellular and Molecular Biology, Federal Fluminense University (UFF), Niteroi 24000-000, Brazil
| | - Mauricio Younes-Ibrahim
- FISCLINEX Postgraduate Program, State University of Rio de Janeiro (UERJ), Rio de Janeiro 20550-900, Brazil
- Department of Medicine, Pontifical Catholic University of Rio de Janeiro (PUC-Rio), Rio de Janeiro 22453-900, Brazil
- State University of Rio de Janeiro (UERJ), Rio de Janeiro 20550-900, Brazil
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7
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Pillai SS, Pereira DG, Zhang J, Huang W, Beg MA, Knaack DA, de Souza Goncalves B, Sahoo D, Silverstein RL, Shapiro JI, Sodhi K, Chen Y. Contribution of adipocyte Na/K-ATPase α1/CD36 signaling induced exosome secretion in response to oxidized LDL. Front Cardiovasc Med 2023; 10:1046495. [PMID: 37180782 PMCID: PMC10174328 DOI: 10.3389/fcvm.2023.1046495] [Citation(s) in RCA: 4] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/16/2022] [Accepted: 04/13/2023] [Indexed: 05/16/2023] Open
Abstract
Introduction Adipose tissue constantly secretes adipokines and extracellular vesicles including exosomes to crosstalk with distinct tissues and organs for whole-body homeostasis. However, dysfunctional adipose tissue under chronic inflammatory conditions such as obesity, atherosclerosis, and diabetes shows pro-inflammatory phenotypes accompanied by oxidative stress and abnormal secretion. Nevertheless, molecular mechanisms of how adipocytes are stimulated to secrete exosomes under those conditions remain poorly understood. Methods Mouse and human in vitro cell culture models were used for performing various cellular and molecular studies on adipocytes and macrophages. Statistical analysis was performed using Student's t-test (two-tailed, unpaired, and equal variance) for comparisons between two groups or ANOVA followed by Bonferroni's multiple comparison test for comparison among more than two groups. Results and discussion In this work, we report that CD36, a scavenger receptor for oxidized LDL, formed a signaling complex with another membrane signal transducer Na/K-ATPase in adipocytes. The atherogenic oxidized LDL induced a pro-inflammatory response in in vitro differentiated mouse and human adipocytes and also stimulated the cells to secrete more exosomes. This was largely blocked by either CD36 knockdown using siRNA or pNaKtide, a peptide inhibitor of Na/K-ATPase signaling. These results showed a critical role of the CD36/Na/K-ATPase signaling complex in oxidized LDL-induced adipocyte exosome secretion. Moreover, by co-incubation of adipocyte-derived exosomes with macrophages, we demonstrated that oxidized LDL-induced adipocyte-derived exosomes promoted pro-atherogenic phenotypes in macrophages, including CD36 upregulation, IL-6 secretion, metabolic switch to glycolysis, and mitochondrial ROS production. Altogether, we show here a novel mechanism through which adipocytes increase exosome secretion in response to oxidized LDL and that the secreted exosomes can crosstalk with macrophages, which may contribute to atherogenesis.
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Affiliation(s)
- Sneha S. Pillai
- Department of Surgery, Biomedical Sciences, and Medicine, Joan C. Edwards School of Medicine, Marshall University, Huntington, WV, United States
| | - Duane G. Pereira
- Department of Surgery, Biomedical Sciences, and Medicine, Joan C. Edwards School of Medicine, Marshall University, Huntington, WV, United States
| | - Jue Zhang
- Versiti Blood Research Institute, Milwaukee, WI, United States
| | - Wenxin Huang
- Versiti Blood Research Institute, Milwaukee, WI, United States
| | - Mirza Ahmar Beg
- Versiti Blood Research Institute, Milwaukee, WI, United States
| | - Darcy A. Knaack
- Department of Biochemistry, Medical College of Wisconsin, Milwaukee, WI, United States
| | - Bruno de Souza Goncalves
- Department of Surgery, Biomedical Sciences, and Medicine, Joan C. Edwards School of Medicine, Marshall University, Huntington, WV, United States
| | - Daisy Sahoo
- Department of Biochemistry, Medical College of Wisconsin, Milwaukee, WI, United States
- Department of Medicine, Medical College of Wisconsin, Milwaukee, WI, United States
- Department of Pharmacology & Toxicology, Medical College of Wisconsin, Milwaukee, WI, United States
| | - Roy L. Silverstein
- Versiti Blood Research Institute, Milwaukee, WI, United States
- Department of Medicine, Medical College of Wisconsin, Milwaukee, WI, United States
| | - Joseph I. Shapiro
- Department of Surgery, Biomedical Sciences, and Medicine, Joan C. Edwards School of Medicine, Marshall University, Huntington, WV, United States
| | - Komal Sodhi
- Department of Surgery, Biomedical Sciences, and Medicine, Joan C. Edwards School of Medicine, Marshall University, Huntington, WV, United States
| | - Yiliang Chen
- Versiti Blood Research Institute, Milwaukee, WI, United States
- Department of Medicine, Medical College of Wisconsin, Milwaukee, WI, United States
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Mukherji ST, Brambilla L, Stuart KB, Mayes I, Kutz LC, Chen Y, Barbosa LA, Elmadbouh I, McDermott JP, Haller ST, Romero MF, Soleimani M, Liu J, Shapiro JI, Blanco GV, Xie Z, Pierre SV. Na/K-ATPase signaling tonically inhibits sodium reabsorption in the renal proximal tubule. FASEB J 2023; 37:e22835. [PMID: 36856735 PMCID: PMC10028530 DOI: 10.1096/fj.202200785rr] [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: 05/23/2022] [Revised: 02/08/2023] [Accepted: 02/10/2023] [Indexed: 03/02/2023]
Abstract
Through its classic ATP-dependent ion-pumping function, basolateral Na/K-ATPase (NKA) generates the Na+ gradient that drives apical Na+ reabsorption in the renal proximal tubule (RPT), primarily through the Na+ /H+ exchanger (NHE3). Accordingly, activation of NKA-mediated ion transport decreases natriuresis through activation of basolateral (NKA) and apical (NHE3) Na+ reabsorption. In contrast, activation of the more recently discovered NKA signaling function triggers cellular redistribution of RPT NKA and NHE3 and decreases Na+ reabsorption. We used gene targeting to test the respective contributions of NKA signaling and ion pumping to the overall regulation of RPT Na+ reabsorption. Knockdown of RPT NKA in cells and mice increased membrane NHE3 and Na+ /HCO3 - cotransporter (NBCe1A). Urine output and absolute Na+ excretion decreased by 65%, driven by increased RPT Na+ reabsorption (as indicated by decreased lithium clearance and unchanged glomerular filtration rate), and accompanied by elevated blood pressure. This hyper reabsorptive phenotype was rescued upon crossing with RPT NHE3-/- mice, confirming the importance of NKA/NHE3 coupling. Hence, NKA signaling exerts a tonic inhibition on Na+ reabsorption by regulating key apical and basolateral Na+ transporters. This action, lifted upon NKA genetic suppression, tonically counteracts NKA's ATP-driven function of basolateral Na+ reabsorption. Strikingly, NKA signaling is not only physiologically relevant but it also appears to be functionally dominant over NKA ion pumping in the control of RPT reabsorption.
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Affiliation(s)
- Shreya T. Mukherji
- Marshall Institute for Interdisciplinary Research, Marshall University, Huntington, WV
| | - Luca Brambilla
- Marshall Institute for Interdisciplinary Research, Marshall University, Huntington, WV
| | - Kailey B. Stuart
- Marshall Institute for Interdisciplinary Research, Marshall University, Huntington, WV
| | - Isabella Mayes
- Marshall Institute for Interdisciplinary Research, Marshall University, Huntington, WV
| | - Laura C. Kutz
- Marshall Institute for Interdisciplinary Research, Marshall University, Huntington, WV
| | - Yiliang Chen
- Department of Medicine, Medical College of Wisconsin, Milwaukee, Wisconsin
- Blood Research Institute, Versiti, WI
| | - Leandro A Barbosa
- Marshall Institute for Interdisciplinary Research, Marshall University, Huntington, WV
- Universidade Federal de São João del-Rei, Campus Centro-Oeste Dona Lindu, Divinópolis, MG, Brazil
| | - Ibrahim Elmadbouh
- Marshall Institute for Interdisciplinary Research, Marshall University, Huntington, WV
| | - Jeff P. McDermott
- Department of Molecular and Integrative Physiology, University of Kansas Medical Center, Kansas City, KS
| | - Steven T. Haller
- Department of Medicine, University of Toledo College of Medicine and Life Sciences, Toledo, OH
| | - Michael F. Romero
- Physiology & Biomedical Engineering and Nephrology & Hypertension, Mayo Clinic College of Medicine & Science, Rochester, MN
| | - Manoocher Soleimani
- Department of Medicine, The University of New Mexico Health Sciences Center, Albuquerque, NM
| | - Jiang Liu
- Joan C. Edwards School of Medicine, Marshall University, Huntington, WV
| | - Joseph I. Shapiro
- Joan C. Edwards School of Medicine, Marshall University, Huntington, WV
| | - Gustavo V. Blanco
- Department of Molecular and Integrative Physiology, University of Kansas Medical Center, Kansas City, KS
| | - Zijian Xie
- Marshall Institute for Interdisciplinary Research, Marshall University, Huntington, WV
| | - Sandrine V. Pierre
- Marshall Institute for Interdisciplinary Research, Marshall University, Huntington, WV
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Weidemann H, Feger D, Ehlert JE, Menger MM, Krempien RC. Markedly divergent effects of Ouabain on a Temozolomide-resistant (T98G) vs. a Temozolomide-sensitive (LN229) Glioblastoma cell line. Discov Oncol 2023; 14:27. [PMID: 36840822 PMCID: PMC9968366 DOI: 10.1007/s12672-023-00633-2] [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] [Grants] [Track Full Text] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/20/2022] [Accepted: 02/17/2023] [Indexed: 02/26/2023] Open
Abstract
BACKGROUND Glioblastoma multiforme (GBM) is the most aggressive primary brain tumor with poor prognosis. GMB are highly recurrent mainly because of radio- and chemoresistance. Radiotherapy with Temozolomide (TMZ) is until today the golden standard adjuvant therapy, however, the optimal treatment of recurrent glioblastoma remains controversial. Ouabain belongs to the Cardiotonic Steroids (CTS) the natural ligands of the Na/K-ATPase (NKA). It is established that the NKA represents a signal transducer with either stimulating or inhibiting cell growth, apoptosis, migration and angiogenesis. Over the last decade evidence grew that CTS have anti-tumor properties especially in GBM. AIM Proceeding from recent studies we wanted to further demonstrate a divergent effect of Ouabain on a TMZ-resistant (T98G) as compared to a TMZ-sensitive (LN229) GBM cell line. METHODS We analyzed the effect of Ouabain on cell migration and plasma cell membrane potential (PCMP) in the LN229 and T98G GBM cell line as well as underlying mechanisms (Bcl-2 and p-Akt/pan-Akt expression). Moreover, we analyzed the anti-angiogenic effect of Ouabain on human umbilical vein endothelial cells (HUVECs). RESULTS T98G cells showed a significant inhibition of cell migration and a significant depolarization of the PCMP at similar Ouabain concentrations (IC50 = 1.67 × 10-7 M) resp. (IC50 = 2.72 × 10-7 M) with a strong inverse correlation (R2 = 0.95). In contrast, LN229 cells did not respond to Ouabain in these assays at all. Similarly, only T98G but not LN229 cells revealed Bcl-2 down-regulation at nanomolar Ouabain concentrations. This unique response to Ouabain is associated with a down-regulation of pan-Akt in T98G cells 24 h after Ouabain (1.0 × 10-6 M) treatment. For the first time, the anti-angiogenic effect of Ouabain on HUVEC cells (IC50 = 5.49 × 10-8 M) was demonstrated which correlated strongly with the anti-migratory effect (R2 = 0.85). CONCLUSION The TMZ-resistant T98G cell line as compared to the TMZ-sensitive LN229 cell line shows a high sensitivity towards Ouabain. We consider it as a promising new compound especially in recurrent GBM to overcome the resistance to TMZ and irradiation.
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Affiliation(s)
- Heidrun Weidemann
- Clinic for Radiotherapy, HELIOS Hospital Berlin-Buch, Schwanebecker Chaussee 50, 13125 Berlin, Germany
| | - Daniel Feger
- Reaction Biology Europe GmbH, Engesserstr.4, 79108 Freiburg, Germany
| | - Jan E. Ehlert
- Reaction Biology Europe GmbH, Engesserstr.4, 79108 Freiburg, Germany
| | - Marcus M. Menger
- Fraunhofer Institute for Cell Therapy and Immunology, Branch Bioanalytics and Bioprocesses (IZI-BB), Am Mühlenberg13, 14476 Potsdam, Germany
| | - Robert C. Krempien
- Clinic for Radiotherapy, HELIOS Hospital Berlin-Buch, Schwanebecker Chaussee 50, 13125 Berlin, Germany
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Incerpi S, Ashur-Fabian O, Davis PJ, Pedersen JZ. Editorial: Crosstalk between thyroid hormones, analogs and ligands of integrin αvβ3 in health and disease. Who is talking now? Front Endocrinol (Lausanne) 2023; 13:1119952. [PMID: 36686434 PMCID: PMC9850369 DOI: 10.3389/fendo.2022.1119952] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/09/2022] [Accepted: 12/19/2022] [Indexed: 01/07/2023] Open
Affiliation(s)
- Sandra Incerpi
- Department of Sciences, University Roma Tre, Rome, Italy
| | - Osnat Ashur-Fabian
- Translational Oncology Laboratory, Meir Medical Center, Kfar-Saba, Israel
- Department of Human Molecular Genetics and Biochemistry, Sackler School of Medicine, Tel Aviv University, Tel Aviv, Israel
| | - Paul J. Davis
- Department of Medicine, Albany Medical College, Albany, NY, United States
- Pharmaceutical Research Institute, Albany College of Pharmacy and Health Sciences, Albany, NY, United States
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Agalakova NI, Reznik VA, Ershov IA, Lupanova EA, Nadei OV, Ivanov DO, David Adair C, Bagrov AY. Silencing of Fli1 Gene Mimics Effects of Preeclampsia and Induces Collagen Synthesis in Human Umbilical Arteries. Am J Hypertens 2022; 35:828-832. [PMID: 35569064 DOI: 10.1093/ajh/hpac065] [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] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/12/2021] [Revised: 02/27/2022] [Accepted: 05/13/2022] [Indexed: 02/02/2023] Open
Abstract
BACKGROUND Previously we demonstrated that in patients with preeclampsia elevated levels of endogenous Na/K-ATPase inhibitor, marinobufagenin, cause inhibition of Friend leukemia virus integration 1 (Fli1), a negative regulator of collagen-1 synthesis. We hypothesized that in vitro silencing of Fli1 in healthy human umbilical arteries would be associated with an increase in collagen-1 output, similar to the effect of preeclampsia in rat and human tissues. METHODS The isolated segments of healthy human umbilical arteries were tested for sensitivity to MBG and Fli1 silencing with Fli1 siRNA or control siRNA. RESULTS Following 24-hour incubation of arteries with nanomolar concentrations of marinobufagenin, Fli1 expression was inhibited 5-fold (P < 0.001), and synthesis of collagen-1 increased 3 times (P < 0.01). Twenty-four-hour incubation of umbilical artery fragments with Fli1 siRNA caused a dramatic decrease of Fli1 (7-fold; P < 0.001) and cytoplasmic PKC δ (4-fold; P < 0.001) expression in comparison to control siRNA or untreated control, followed by elevation in procollagen (3-fold; P < 0.001) and collagen-1 (3-fold; P < 0.001) levels in vascular tissue. CONCLUSIONS Our results show that after silencing the Fli1 gene in healthy human umbilical arteries a new phenotype emerges which is typical for preeclampsia and is associated with vascular fibrosis.
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Affiliation(s)
- Natalia I Agalakova
- Sechenov Institute of Evolutionary Physiology and Biochemistry, St. Petersburg, Russia
| | - Vitaly A Reznik
- Department of Obstetrics and Gynecology, St. Petersburg State Pediatric Medical University, St. Petersburg, Russia
| | - Ivan A Ershov
- Department of Obstetrics and Gynecology, St. Petersburg State Pediatric Medical University, St. Petersburg, Russia
| | - Ekaterina A Lupanova
- Department of Obstetrics and Gynecology, St. Petersburg State Pediatric Medical University, St. Petersburg, Russia
| | - Olga V Nadei
- Sechenov Institute of Evolutionary Physiology and Biochemistry, St. Petersburg, Russia
| | - Dmitry O Ivanov
- Department of Obstetrics and Gynecology, St. Petersburg State Pediatric Medical University, St. Petersburg, Russia
| | - C David Adair
- Department of Obstetrics and Gynecology, Section on Maternal Fetal Medicine, University of Tennessee, Chattanooga, Tennessee, USA
| | - Alexei Y Bagrov
- Sechenov Institute of Evolutionary Physiology and Biochemistry, St. Petersburg, Russia
- Padakonn Pharma, Narva, Estonia
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12
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Maldonado-Ruiz LP, Urban J, Davis BN, Park JJ, Zurek L, Park Y. Dermal secretion physiology and thermoregulation in the lone star tick, Amblyomma americanum. Ticks Tick Borne Dis 2022; 13:101962. [PMID: 35525214 DOI: 10.1016/j.ttbdis.2022.101962] [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: 07/27/2021] [Revised: 03/21/2022] [Accepted: 04/24/2022] [Indexed: 11/29/2022]
Abstract
Ticks are hematophagous ectoparasites that transmit a wide range of pathogens. The lone star tick, Amblyomma americanum, is one of the most widely distributed ticks in the Midwest and Eastern United States. Lone star ticks, as other three-host ixodid ticks, can survive in harsh environments for extended periods without a blood meal. Physiological mechanisms that allow them to survive during hot and dry seasons include thermal tolerance and water homeostasis. Dermal fluid secretions have been described in metastriate ticks including A. americanum. We hypothesized that tick dermal secretion in the unfed tick plays a role in thermoregulation, as described in other hematophagous arthropods during blood feeding. In this study, we found that physical contact with a heat probe at 45 °C or high environmental temperature at ∼50 °C can trigger dermal secretion in A. americanum and other metastriate ticks in the off-host period. We demonstrated that dermal secretion plays a role in evaporative cooling when ticks are exposed to high temperatures. We find that type II dermal glands, having paired two cells and forming large glandular structures, are the source of dermal secretion. The secretion was triggered by an injection of serotonin, and the serotonin-mediated secretion was suppressed by a pretreatment with ouabain, a Na/K-ATPase blocker, implying that the secretion is controlled by serotonin and the downstream Na/K-ATPase.
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Affiliation(s)
| | - Joshua Urban
- Department of Entomology, Kansas State University, Manhattan KS66506, USA
| | - Brianna N Davis
- Department of Entomology, Kansas State University, Manhattan KS66506, USA
| | - Jessica J Park
- Department of Entomology, Kansas State University, Manhattan KS66506, USA
| | - Ludek Zurek
- Department of Chemistry and Biochemistry, Mendel University, Brno, Czech Republic; Department of Microbiology, Nutrition and Dietetics, Czech Agricultural University, Prague, Czech Republic
| | - Yoonseong Park
- Department of Entomology, Kansas State University, Manhattan KS66506, USA.
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13
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Agalakova NI, Grigorova YN, Ershov IA, Reznik VA, Mikhailova EV, Nadei OV, Samuilovskaya L, Romanova LA, Adair CD, Romanova IV, Bagrov AY. Canrenone Restores Vasorelaxation Impaired by Marinobufagenin in Human Preeclampsia. Int J Mol Sci 2022; 23. [PMID: 35328757 DOI: 10.3390/ijms23063336] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [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: 02/23/2022] [Revised: 03/12/2022] [Accepted: 03/14/2022] [Indexed: 02/01/2023] Open
Abstract
Previous studies implicated cardiotonic steroids, including Na/K-ATPase inhibitor marinobufagenin (MBG), in the pathogenesis of preeclampsia (PE). Recently, we demonstrated that (i) MBG induces fibrosis in rat tissues via a mechanism involving Fli1, a negative regulator of collagen-1 synthesis, and (ii) MBG sensitive Na/K-ATPase inhibition is reversed by mineralocorticoid antagonists. We hypothesized that in human PE elevated MBG level is associated with the development of fibrosis of the umbilical arteries and that this fibrosis can be attenuated by canrenone. Fifteen patients with PE (mean BP = 118 ± 4 mmHg; 34 ± 2 years; 38 ± 0.3 weeks gest. age) and twelve gestational age-matched normal pregnant subjects (mean BP = 92 ± 2 mmHg; 34 ± 1 years; 39 ± 0.2 weeks gest. age) were enrolled in the study. PE was associated with a higher plasma MBG level, with a four-fold decrease in Fli1 level and a three-fold increase in collagen-1 level in the PE umbilical arteries vs. those from the normal subjects (p < 0.01). Isolated rings of umbilical arteries from the subjects with PE exhibited impaired responses to the relaxant effect of sodium nitroprusside vs. control vessels (EC50 = 141 nmol/L vs. EC50 = 0.9 nmol/L; p < 0.001). The effects of PE on Fli1 and collagen-1 were blocked by the in vitro treatment of umbilical arteries by 10 μmol/L canrenone. Similar results were obtained for umbilical arteries pretreated with MBG. These data demonstrate that elevated MBG level is implicated in the development of the fibrosis of umbilical arteries in PE, and that this could be blocked by mineralocorticoid antagonists.
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14
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Huang M, Wang X, Banerjee M, Mukherji ST, Kutz LC, Zhao A, Sepanski M, Fan CM, Zhu GZ, Tian J, Wang DZ, Zhu H, Xie ZJ, Pierre SV, Cai L. Regulation of Myogenesis by a Na/K-ATPase α1 Caveolin-Binding Motif. Stem Cells 2022; 40:133-148. [PMID: 35257186 PMCID: PMC8943859 DOI: 10.1093/stmcls/sxab012] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [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: 03/31/2021] [Accepted: 09/25/2021] [Indexed: 01/12/2024]
Abstract
The N-terminal caveolin-binding motif (CBM) in Na/K-ATPase (NKA) α1 subunit is essential for cell signaling and somitogenesis in animals. To further investigate the molecular mechanism, we have generated CBM mutant human-induced pluripotent stem cells (iPSCs) through CRISPR/Cas9 genome editing and examined their ability to differentiate into skeletal muscle (Skm) cells. Compared with the parental wild-type human iPSCs, the CBM mutant cells lost their ability of Skm differentiation, which was evidenced by the absence of spontaneous cell contraction, marker gene expression, and subcellular myofiber banding structures in the final differentiated induced Skm cells. Another NKA functional mutant, A420P, which lacks NKA/Src signaling function, did not produce a similar defect. Indeed, A420P mutant iPSCs retained intact pluripotency and ability of Skm differentiation. Mechanistically, the myogenic transcription factor MYOD was greatly suppressed by the CBM mutation. Overexpression of a mouse Myod cDNA through lentiviral delivery restored the CBM mutant cells' ability to differentiate into Skm. Upstream of MYOD, Wnt signaling was demonstrated from the TOPFlash assay to have a similar inhibition. This effect on Wnt activity was further confirmed functionally by defective induction of the presomitic mesoderm marker genes BRACHYURY (T) and MESOGENIN1 (MSGN1) by Wnt3a ligand or the GSK3 inhibitor/Wnt pathway activator CHIR. Further investigation through immunofluorescence imaging and cell fractionation revealed a shifted membrane localization of β-catenin in CBM mutant iPSCs, revealing a novel molecular component of NKA-Wnt regulation. This study sheds light on a genetic regulation of myogenesis through the CBM of NKA and control of Wnt/β-catenin signaling.
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Affiliation(s)
- Minqi Huang
- Marshall Institute for Interdisciplinary Research (MIIR) at Marshall University, Huntington, WV 25703, USA
| | - Xiaoliang Wang
- Marshall Institute for Interdisciplinary Research (MIIR) at Marshall University, Huntington, WV 25703, USA
- Joan C. Edwards School of Medicine at Marshall University, Huntington, WV 25703, USA
| | - Moumita Banerjee
- Marshall Institute for Interdisciplinary Research (MIIR) at Marshall University, Huntington, WV 25703, USA
| | - Shreya T Mukherji
- Marshall Institute for Interdisciplinary Research (MIIR) at Marshall University, Huntington, WV 25703, USA
| | - Laura C Kutz
- Marshall Institute for Interdisciplinary Research (MIIR) at Marshall University, Huntington, WV 25703, USA
| | - Aijie Zhao
- Marshall Institute for Interdisciplinary Research (MIIR) at Marshall University, Huntington, WV 25703, USA
| | - Michael Sepanski
- Department of Embryology, Carnegie Institution for Science, 3520 San Martin Drive, Baltimore, MD 21218, USA
| | - Chen-Ming Fan
- Department of Embryology, Carnegie Institution for Science, 3520 San Martin Drive, Baltimore, MD 21218, USA
| | - Guo-Zhang Zhu
- Department of Biological Sciences, Marshall University, Huntington, WV 25703, USA
| | - Jiang Tian
- Marshall Institute for Interdisciplinary Research (MIIR) at Marshall University, Huntington, WV 25703, USA
- Joan C. Edwards School of Medicine at Marshall University, Huntington, WV 25703, USA
| | - Da-Zhi Wang
- University of South Florida Health Heart Institute, Morsani College of Medicine, University of South Florida, 560 Channelside Drive, Tampa, FL 33602, USA
| | - Hua Zhu
- Department of Surgery, The Ohio State University, 396 Biomedical Research Tower, 460 W. 12th Avenue, Columbus, OH 43210, USA
| | - Zi-Jian Xie
- Marshall Institute for Interdisciplinary Research (MIIR) at Marshall University, Huntington, WV 25703, USA
| | - Sandrine V Pierre
- Marshall Institute for Interdisciplinary Research (MIIR) at Marshall University, Huntington, WV 25703, USA
| | - Liquan Cai
- Marshall Institute for Interdisciplinary Research (MIIR) at Marshall University, Huntington, WV 25703, USA
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15
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Abdou HM, Abd Elkader HTAE, El-Gendy AH, Eweda SM. Neurotoxicity and neuroinflammatory effects of bisphenol A in male rats: the neuroprotective role of grape seed proanthocyanidins. Environ Sci Pollut Res Int 2022; 29:9257-9268. [PMID: 34505250 DOI: 10.1007/s11356-021-16311-1] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/25/2021] [Accepted: 08/29/2021] [Indexed: 06/13/2023]
Abstract
Exposure to bisphenol A (BPA) contributes to neurological disorders, but the underlying mechanisms are still not completely understood. We studied the neurotoxic effect of BPA and how it promotes inflammation and alteration in the neurotransmission synthesis, release, and transmission. This study was also designed to investigate the neuroprotective effect of grape seed proanthocyanidins (GSPE) against BPA-induced neurotoxicity in rats. Rats were equally divided into 4 groups with 7 rats in each: control group, BPA group, GSPE + BPA group, and GSPE group. Rats were orally treated with their respective doses (50 mg BPA/kg BW and/or 200 mg GSPE/kg BW) daily for 70 days. BPA elicits significant elevation in malondialdehyde (MDA) and nitric oxide (NO) associated with a significant reduction in glutathione (GSH), total thiols, glutathione peroxidase (GPx), superoxide dismutase (SOD), and glutathione-S-transferase (GST). BPA exposure results in increased dopamine and serotonin levels, elevation in acetylcholinesterase (AChE) activity, and reduction in Na/K-ATPase and total ATPase activities in the brain. Also, BPA induces upregulation in the gene expression of the inflammatory markers, tumor necrosis factor-α (TNF-α) and cyclooxygenase-2 (COX-2), and in the tumor suppressor and pro-oxidant p53 protein. The pretreatment with GSPE attenuates or ameliorate all the oxidative and neurotoxic parameters induced by BPA. Our results suggest that GSPE has a promising role in modulating BPA-induced neuroinflammation and neurotoxicity and its antioxidant and free radical scavenging activities may in part be responsible for such effects.
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Affiliation(s)
- Heba M Abdou
- Department of Zoology, Faculty of Science, Alexandria University, Alexandria, 21561, Egypt
| | | | - Amel H El-Gendy
- Department of Zoology, Faculty of Science, Alexandria University, Alexandria, 21561, Egypt
| | - Saber Mohamed Eweda
- Department of Biochemistry, Faculty of Science, Alexandria University, Alexandria, 21561, Egypt.
- Medical Laboratories Technology Department, College of Applied Medical Sciences, Taibah University, Madinah, Kingdom of Saudi Arabia.
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16
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Incerpi S, Gionfra F, De Luca R, Candelotti E, De Vito P, Percario ZA, Leone S, Gnocchi D, Rossi M, Caruso F, Scapin S, Davis PJ, Lin HY, Affabris E, Pedersen JZ. Extranuclear effects of thyroid hormones and analogs during development: An old mechanism with emerging roles. Front Endocrinol (Lausanne) 2022; 13:961744. [PMID: 36213288 PMCID: PMC9540375 DOI: 10.3389/fendo.2022.961744] [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] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/05/2022] [Accepted: 08/29/2022] [Indexed: 11/13/2022] Open
Abstract
Thyroid hormones, T3 (triiodothyronine) and T4 (thyroxine), induce a variety of long-term effects on important physiological functions, ranging from development and growth to metabolism regulation, by interacting with specific nuclear or cytosolic receptors. Extranuclear or nongenomic effects of thyroid hormones are mediated by plasma membrane or cytoplasmic receptors, mainly by αvβ3 integrin, and are independent of protein synthesis. A wide variety of nongenomic effects have now been recognized to be elicited through the binding of thyroid hormones to this receptor, which is mainly involved in angiogenesis, as well as in cell cancer proliferation. Several signal transduction pathways are modulated by thyroid hormone binding to αvβ3 integrin: protein kinase C, protein kinase A, Src, or mitogen-activated kinases. Thyroid hormone-activated nongenomic effects are also involved in the regulation of Na+-dependent transport systems, such as glucose uptake, Na+/K+-ATPase, Na+/H+ exchanger, and amino acid transport System A. Of note, the modulation of these transport systems is cell-type and developmental stage-dependent. In particular, dysregulation of Na+/K+-ATPase activity is involved in several pathological situations, from viral infection to cancer. Therefore, this transport system represents a promising pharmacological tool in these pathologies.
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Affiliation(s)
- Sandra Incerpi
- Department of Sciences, University Roma Tre, Roma, Italy
- *Correspondence: Sandra Incerpi, ; Jens Z. Pedersen,
| | - Fabio Gionfra
- Department of Sciences, University Roma Tre, Roma, Italy
| | - Roberto De Luca
- Beth Israel Deaconess Medical Center, Harvard Medical School, Boston, MA, United States
| | | | - Paolo De Vito
- Department of Biology, University Tor Vergata, Rome, Italy
| | | | - Stefano Leone
- Department of Sciences, University Roma Tre, Roma, Italy
| | - Davide Gnocchi
- Interdisciplinary Department of Medicine, University of Bari, School of Medicine, Bari, Italy
| | - Miriam Rossi
- Department of Chemistry, Vassar College, Poughkeepsie, NY, United States
| | - Francesco Caruso
- Department of Chemistry, Vassar College, Poughkeepsie, NY, United States
| | - Sergio Scapin
- Department of Cellular and Developmental Biology, Sapienza University, Rome, Italy
| | - Paul J. Davis
- Department of Medicine, Albany Medical College, Albany, NY, United States
- Pharmaceutical Research Institute, Albany College of Pharmacy and Health Sciences, Albany, NY, United States
| | - Hung-Yun Lin
- Department of Medicine, Albany Medical College, Albany, NY, United States
- Pharmaceutical Research Institute, Albany College of Pharmacy and Health Sciences, Albany, NY, United States
- Taipei Cancer Center, Taipei Medical University, Taipei, Taiwan
- Graduate Institute of Cancer Biology and Drug Discovery, College of Medical Science and Technology, Taipei Medical University, Taipei, Taiwan
- Traditional Herbal Medicine Research Center of Taipei, Medical University Hospital, Taipei Medical University, Taipei, Taiwan
- TMU Research Center of Cancer Translational Medicine, Taipei Medical University, Taipei, Taiwan
| | | | - Jens Z. Pedersen
- Department of Biology, University Tor Vergata, Rome, Italy
- *Correspondence: Sandra Incerpi, ; Jens Z. Pedersen,
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17
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Kobuke K, Oki K, Gomez-Sanchez CE, Gomez-Sanchez EP, Itcho K, Ohno H, Nagano G, Yoshii Y, Baba R, Kodama T, Arihiro K, Hattori N, Yoneda M. ATP1A1 Mutant in Aldosterone-Producing Adenoma Leads to Cell Proliferation. Int J Mol Sci 2021; 22:10981. [PMID: 34681640 DOI: 10.3390/ijms222010981] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [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: 09/13/2021] [Revised: 10/04/2021] [Accepted: 10/09/2021] [Indexed: 12/14/2022] Open
Abstract
The molecular mechanisms by which ATP1A1 mutation-mediated cell proliferation or tumorigenesis in aldosterone-producing adenomas (APAs) have not been elucidated. First, we investigated whether the APA-associated ATP1A1 L104R mutation stimulated cell proliferation. Second, we aimed to clarify the molecular mechanisms by which the ATP1A1 mutation-mediated cell proliferated. We performed transcriptome analysis in APAs with ATP1A1 mutation. ATP1A1 L104R mutation were modulated in human adrenocortical carcinoma (HAC15) cells (ATP1A1-mutant cells), and we evaluated cell proliferation and molecular signaling events. Transcriptome and immunohistochemical analysis showed that Na/K-ATPase (NKA) expressions in ATP1A1 mutated APA were more abundant than those in non-functioning adrenocortical adenoma or KCNJ5 mutated APAs. The significant increase of number of cells, amount of DNA and S-phase population were shown in ATP1A1-mutant cells. Fluo-4 in ATP1A1-mutant cells were significantly increased. Low concentration of ouabain stimulated cell proliferation in ATP1A1-mutant cells. ATP1A1-mutant cells induced Src phosphorylation, and low concentration of ouabain supplementation showed further Src phosphorylation. We demonstrated that NKAs were highly expressed in ATP1A1 mutant APA, and the mutant stimulated cell proliferation and Src phosphorylation in ATP1A1-mutant cells. NKA stimulations would be a risk factor for the progression and development to an ATP1A1 mutant APA.
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18
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Liu J, Tian J, Sodhi K, Shapiro JI. The Na/K-ATPase Signaling and SGLT2 Inhibitor-Mediated Cardiorenal Protection: A Crossed Road? J Membr Biol 2021; 254:513-529. [PMID: 34297135 PMCID: PMC8595165 DOI: 10.1007/s00232-021-00192-z] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [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: 03/31/2021] [Accepted: 07/06/2021] [Indexed: 12/17/2022]
Abstract
In different large-scale clinic outcome trials, sodium (Na+)/glucose co-transporter 2 (SGLT2) inhibitors showed profound cardiac- and renal-protective effects, making them revolutionary treatments for heart failure and kidney disease. Different theories are proposed according to the emerging protective effects other than the original purpose of glucose-lowering in diabetic patients. As the ATP-dependent primary ion transporter providing the Na+ gradient to drive other Na+-dependent transporters, the possible role of the sodium–potassium adenosine triphosphatase (Na/K-ATPase) as the primary ion transporter and its signaling function is not explored.
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Affiliation(s)
- Jiang Liu
- Department of Biomedical Sciences, JCE School of Medicine, Marshall University, Huntington, WV, USA.
| | - Jiang Tian
- Department of Biomedical Sciences, JCE School of Medicine, Marshall University, Huntington, WV, USA
| | - Komal Sodhi
- Department of Surgery, JCE School of Medicine, Marshall University, Huntington, WV, USA
| | - Joseph I Shapiro
- Departments of Medicine, JCE School of Medicine, Marshall University, Huntington, WV, USA
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Słabiak-Błaż N, Piecha G. Endogenous Mammalian Cardiotonic Steroids-A New Cardiovascular Risk Factor?-A Mini-Review. Life (Basel) 2021; 11:life11080727. [PMID: 34440471 PMCID: PMC8398695 DOI: 10.3390/life11080727] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [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: 07/06/2021] [Revised: 07/18/2021] [Accepted: 07/20/2021] [Indexed: 12/19/2022] Open
Abstract
The role of endogenous mammalian cardiotonic steroids (CTS) in the physiology and pathophysiology of the cardiovascular system and the kidneys has interested researchers for more than 20 years. Cardiotonic steroids extracted from toads or plants, such as digitalis, have been used to treat heart disease since ancient times. CTS, also called endogenous digitalis-like factors, take part in the regulation of blood pressure and sodium homeostasis through their effects on the transport enzyme called sodium–potassium adenosine triphosphatase (Na/K-ATPase) in renal and cardiovascular tissue. In recent years, there has been increasing evidence showing deleterious effects of CTS on the structure and function of the heart, vasculature and kidneys. Understanding the role of CTS may be useful in the development of potential new therapeutic strategies.
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20
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Banerjee M, Li Z, Gao Y, Lai F, Huang M, Zhang Z, Cai L, Sanabria J, Gao T, Xie Z, Pierre SV. Inverse agonism at the Na/K-ATPase receptor reverses EMT in prostate cancer cells. Prostate 2021; 81:667-682. [PMID: 33956349 PMCID: PMC10071553 DOI: 10.1002/pros.24144] [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] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/19/2020] [Revised: 12/22/2020] [Accepted: 02/19/2021] [Indexed: 12/14/2022]
Abstract
The surface expression of Na/K-ATPase α1 (NKA) is significantly reduced in primary prostate tumors and further decreased in bone metastatic lesions. Here, we show that the loss of cell surface expression of NKA induces epithelial-mesenchymal transition (EMT) and promotes metastatic potential and tumor growth of prostate cancer (PCa) by decreasing the expression of E-cadherin and increasing c-Myc expression via the activation of Src/FAK pathways. Mechanistically, reduced surface expression of NKA in PCa is due to increased endocytosis through the activation of NKA/Src receptor complex. Using a high-throughput NKA ligand-screening platform, we have discovered MB5 as an inverse agonist of the NKA/Src receptor complex, capable of blocking the endocytosis of NKA. MB5 treatment increased NKA expression and E-cadherin in PCa cells, which reversed EMT and consequently decreased the invasion and growth of spheroid models and tumor xenografts. Thus, we have identified a hitherto unrecognized mechanism that regulates EMT and invasiveness of PCa and demonstrated for the first time the feasibility of identifying inverse agonists of receptor NKA/Src complex and their potential utility as anticancer drugs. We, therefore, conclude that cell surface expression of α1 NKA can be targeted for the development of new therapeutics against aggressive PCa and that MB5 may serve as a prototype for drug development against EMT in metastatic PCa.
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Affiliation(s)
- Moumita Banerjee
- Marshall Institute for Interdisciplinary Research (MIIR), Marshall University, Huntington, West Virginia, USA
| | - Zhichuan Li
- Department of Physiology, Pharmacology, and Medicine, University of Toledo Health Science Campus, Toledo, Ohio, USA
| | - Yingnyu Gao
- Marshall Institute for Interdisciplinary Research (MIIR), Marshall University, Huntington, West Virginia, USA
- Institute of Edible Fungi, Shanghai Academy of Agriculture Science, Shanghai, China
| | - Fangfang Lai
- Department of Physiology, Pharmacology, and Medicine, University of Toledo Health Science Campus, Toledo, Ohio, USA
- Institute of Materia Medica, Peking Union Medical College, Beijing, China
| | - Minqi Huang
- Marshall Institute for Interdisciplinary Research (MIIR), Marshall University, Huntington, West Virginia, USA
| | - Zhongbing Zhang
- Department of Physiology, Pharmacology, and Medicine, University of Toledo Health Science Campus, Toledo, Ohio, USA
- Institute of Medicinal Biotechnology, Chinese Academy of Medical Sciences and Peking Union Medical College, Beijing, China
| | - Liquan Cai
- Marshall Institute for Interdisciplinary Research (MIIR), Marshall University, Huntington, West Virginia, USA
| | - Juan Sanabria
- Marshall Institute for Interdisciplinary Research (MIIR), Marshall University, Huntington, West Virginia, USA
- Department of Surgery, Joan Edwards School of Medicine Marshall University, Huntington, West Virginia, USA
| | - Tianyan Gao
- Department of Molecular and Cellular Biochemistry, Markey Cancer Research Center, University of Kentucky, Lexington, Kentucky, USA
| | - Zijian Xie
- Marshall Institute for Interdisciplinary Research (MIIR), Marshall University, Huntington, West Virginia, USA
| | - Sandrine V Pierre
- Marshall Institute for Interdisciplinary Research (MIIR), Marshall University, Huntington, West Virginia, USA
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21
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Marck PV, Pessoa MT, Xu Y, Kutz LC, Collins DM, Yan Y, King C, Wang X, Duan Q, Cai L, Xie JX, Lingrel JB, Xie Z, Tian J, Pierre SV. Cardiac Oxidative Signaling and Physiological Hypertrophy in the Na/K-ATPase α1 s/sα2 s/s Mouse Model of High Affinity for Cardiotonic Steroids. Int J Mol Sci 2021; 22:ijms22073462. [PMID: 33801629 PMCID: PMC8036649 DOI: 10.3390/ijms22073462] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/27/2021] [Revised: 03/18/2021] [Accepted: 03/23/2021] [Indexed: 11/25/2022] Open
Abstract
The Na/K-ATPase is the specific receptor for cardiotonic steroids (CTS) such as ouabain and digoxin. At pharmacological concentrations used in the treatment of cardiac conditions, CTS inhibit the ion-pumping function of Na/K-ATPase. At much lower concentrations, in the range of those reported for endogenous CTS in the blood, they stimulate hypertrophic growth of cultured cardiac myocytes through initiation of a Na/K-ATPase-mediated and reactive oxygen species (ROS)-dependent signaling. To examine a possible effect of endogenous concentrations of CTS on cardiac structure and function in vivo, we compared mice expressing the naturally resistant Na/K-ATPase α1 and age-matched mice genetically engineered to express a mutated Na/K-ATPase α1 with high affinity for CTS. In this model, total cardiac Na/K-ATPase activity, α1, α2, and β1 protein content remained unchanged, and the cardiac Na/K-ATPase dose–response curve to ouabain shifted to the left as expected. In males aged 3–6 months, increased α1 sensitivity to CTS resulted in a significant increase in cardiac carbonylated protein content, suggesting that ROS production was elevated. A moderate but significant increase of about 15% of the heart-weight-to-tibia-length ratio accompanied by an increase in the myocyte cross-sectional area was detected. Echocardiographic analyses did not reveal any change in cardiac function, and there was no fibrosis or re-expression of the fetal gene program. RNA sequencing analysis indicated that pathways related to energy metabolism were upregulated, while those related to extracellular matrix organization were downregulated. Consistent with a functional role of the latter, an angiotensin-II challenge that triggered fibrosis in the α1r/rα2s/s mouse failed to do so in the α1s/sα2s/s. Taken together, these results are indicative of a link between circulating CTS, Na/K-ATPase α1, ROS, and physiological cardiac hypertrophy in mice under baseline laboratory conditions.
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Affiliation(s)
- Pauline V. Marck
- Marshall Institute for Interdisciplinary Research, Huntington, WV 25703, USA; (P.V.M.); (M.T.P.); (Y.X.); (L.C.K.); (D.M.C.); (C.K.); (X.W.); (L.C.); (Z.X.); (J.T.)
| | - Marco T. Pessoa
- Marshall Institute for Interdisciplinary Research, Huntington, WV 25703, USA; (P.V.M.); (M.T.P.); (Y.X.); (L.C.K.); (D.M.C.); (C.K.); (X.W.); (L.C.); (Z.X.); (J.T.)
| | - Yunhui Xu
- Marshall Institute for Interdisciplinary Research, Huntington, WV 25703, USA; (P.V.M.); (M.T.P.); (Y.X.); (L.C.K.); (D.M.C.); (C.K.); (X.W.); (L.C.); (Z.X.); (J.T.)
| | - Laura C. Kutz
- Marshall Institute for Interdisciplinary Research, Huntington, WV 25703, USA; (P.V.M.); (M.T.P.); (Y.X.); (L.C.K.); (D.M.C.); (C.K.); (X.W.); (L.C.); (Z.X.); (J.T.)
| | - Dominic M. Collins
- Marshall Institute for Interdisciplinary Research, Huntington, WV 25703, USA; (P.V.M.); (M.T.P.); (Y.X.); (L.C.K.); (D.M.C.); (C.K.); (X.W.); (L.C.); (Z.X.); (J.T.)
| | - Yanling Yan
- Department of Biomedical Sciences, Marshall University Joan C. Edwards School of Medicine, Huntington, WV 25755, USA;
| | - Cierra King
- Marshall Institute for Interdisciplinary Research, Huntington, WV 25703, USA; (P.V.M.); (M.T.P.); (Y.X.); (L.C.K.); (D.M.C.); (C.K.); (X.W.); (L.C.); (Z.X.); (J.T.)
| | - Xiaoliang Wang
- Marshall Institute for Interdisciplinary Research, Huntington, WV 25703, USA; (P.V.M.); (M.T.P.); (Y.X.); (L.C.K.); (D.M.C.); (C.K.); (X.W.); (L.C.); (Z.X.); (J.T.)
| | - Qiming Duan
- Gladstone Institute of Cardiovascular Disease, San Francisco, CA 94158, USA;
| | - Liquan Cai
- Marshall Institute for Interdisciplinary Research, Huntington, WV 25703, USA; (P.V.M.); (M.T.P.); (Y.X.); (L.C.K.); (D.M.C.); (C.K.); (X.W.); (L.C.); (Z.X.); (J.T.)
| | - Jeffrey X. Xie
- Department of Internal Medicine, University of Michigan, Ann Arbor, MI 48109, USA;
| | - Jerry B. Lingrel
- Department of Molecular Genetics, Biochemistry and Microbiology, University of Cincinnati College of Medicine, Cincinnati, OH 45267, USA;
| | - Zijian Xie
- Marshall Institute for Interdisciplinary Research, Huntington, WV 25703, USA; (P.V.M.); (M.T.P.); (Y.X.); (L.C.K.); (D.M.C.); (C.K.); (X.W.); (L.C.); (Z.X.); (J.T.)
| | - Jiang Tian
- Marshall Institute for Interdisciplinary Research, Huntington, WV 25703, USA; (P.V.M.); (M.T.P.); (Y.X.); (L.C.K.); (D.M.C.); (C.K.); (X.W.); (L.C.); (Z.X.); (J.T.)
| | - Sandrine V. Pierre
- Marshall Institute for Interdisciplinary Research, Huntington, WV 25703, USA; (P.V.M.); (M.T.P.); (Y.X.); (L.C.K.); (D.M.C.); (C.K.); (X.W.); (L.C.); (Z.X.); (J.T.)
- Correspondence: ; Tel.: +1-(304)-696-3505
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22
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Martins CA, Santos MCBD, Gonçalves-de-Albuquerque CF, Castro-Faria-Neto HC, Castro-Faria MV, Burth P, Younes-Ibrahim M. The relationship of oleic acid/albumin molar ratio and clinical outcomes in leptospirosis. Heliyon 2021; 7:e06420. [PMID: 33732938 PMCID: PMC7944043 DOI: 10.1016/j.heliyon.2021.e06420] [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] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/31/2020] [Revised: 01/12/2021] [Accepted: 03/01/2021] [Indexed: 11/16/2022] Open
Abstract
Human leptospirosis is an acute infectious zoonosis presenting specific lipid disorders. Previous in vitro studies showed both leptospira glycolipoprotein endotoxin, and high oleic acid levels were associated with Na/K-ATPase inhibition that is amplified by the reduction of circulating albumin levels. In this study, we aimed to investigate the relationship of oleic acid/albumin (OA/A) molar ratio and clinical outcomes in Leptospirosis. Through a prospective observational cohort study employing high-performance liquid chromatography (HPLC) we sequentially determined serum concentrations of nonesterified fatty acids (NEFA) and albumin in twenty-eight patients with severe leptospirosis since their hospital admission. Twenty patients recovered, and eight died. Data was distributed in two groups according to clinical outcomes. Oleic acid/albumin molar ratios (OA/A), initial samples, were higher than those in healthy donors. The ratio OA/A, however, persisted high in dying patients, whereas patients who survived had a reduction matching to healthy donors. Biochemical alterations suggest that cure is correlated to the reestablishment of the OA/A molar ratio, while fatal outcomes related to persisting OA/A imbalances. Analysis by receiver operating characteristic (ROC) showed the area under the curve of 0.864 and the cutoff value of 0.715 being associated with a high odds ratio. Lipid analysis from patients with leptospirosis had an acute high serum OA/A molar ratio, and sustained imbalance has a high odds ratio and strong correlation with mortality.
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Affiliation(s)
- Caroline Azevedo Martins
- Laboratório Integrado de Nefrologia, Department of Internal Medicine, Medical Sciences School, State University of Rio de Janeiro, Brazil
| | - Maria Conceição B dos Santos
- Laboratório Integrado de Nefrologia, Department of Internal Medicine, Medical Sciences School, State University of Rio de Janeiro, Brazil
| | - Cassiano Felippe Gonçalves-de-Albuquerque
- Laboratório de Imunofarmacologia, Oswaldo Cruz Institute, Fiocruz, Rio de Janeiro, Brazil
- Laboratório de Imunofarmacologia, Departamento de Bioquímica, Universidade Federal do Estado do Rio de Janeiro, Rio de Janeiro, Brazil
| | | | - Mauro Velho Castro-Faria
- Laboratório Integrado de Nefrologia, Department of Internal Medicine, Medical Sciences School, State University of Rio de Janeiro, Brazil
| | - Patricia Burth
- Laboratório de Enzimologia e Sinalização Celular, Department of Cellular and Molecular Biology, Federal Fluminense University, Niteroi, Brazil
| | - Mauricio Younes-Ibrahim
- Laboratório Integrado de Nefrologia, Department of Internal Medicine, Medical Sciences School, State University of Rio de Janeiro, Brazil
- Departamento de Medicina, Pontifícia Universidade Católica, Rio de Janeiro, Brazil
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23
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Agalakova NI, Kolodkin NI, Adair CD, Trashkov AP, Bagrov AY. Preeclampsia: Cardiotonic Steroids, Fibrosis, Fli1 and Hint to Carcinogenesis. Int J Mol Sci 2021; 22:ijms22041941. [PMID: 33669287 PMCID: PMC7920043 DOI: 10.3390/ijms22041941] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/21/2020] [Revised: 01/31/2021] [Accepted: 02/05/2021] [Indexed: 12/14/2022] Open
Abstract
Despite prophylaxis and attempts to select a therapy, the frequency of preeclampsia does not decrease and it still takes the leading position in the structure of maternal mortality and morbidity worldwide. In this review, we present a new theory of the etiology and pathogenesis of preeclampsia that is based on the interaction of Na/K-ATPase and its endogenous ligands including marinobufagenin. The signaling pathway of marinobufagenin involves an inhibition of transcriptional factor Fli1, a negative regulator of collagen synthesis, followed by the deposition of collagen in the vascular tissues and altered vascular functions. Moreover, in vitro and in vivo neutralization of marinobufagenin is associated with the restoration of Fli1. The inverse relationship between marinobufagenin and Fli1 opens new possibilities in the treatment of cancer; as Fli1 is a proto-oncogene, a hypothesis on the suppression of Fli1 by cardiotonic steroids as a potential anti-tumor therapeutic strategy is discussed as well. We propose a novel therapy of preeclampsia that is based on immunoneutralization of the marinobufagenin by monoclonal antibodies, which is capable of impairing marinobufagenin-Na/K-ATPase interactions.
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Affiliation(s)
- Natalia I. Agalakova
- Sechenov Institute of Evolutionary Physiology and Biochemistry, 44 Torez Prospect, 194223 St. Petersburg, Russia;
| | - Nikolai I. Kolodkin
- State Institute of Highly Pure Biopreparations and Sechenov Institute of Evolutionary Physiology and Biochemistry, 44 Torez Prospect, 194223 St. Petersburg, Russia; or
| | - C. David Adair
- Department of Obstetrics and Gynecology, University of Tennessee, Chattanooga, TN 37402, USA; or
| | - Alexander P. Trashkov
- Konstantinov St. Petersburg Nuclear Physics Institute, National Research Centre Kurchatov Institute, 1 Orlova Roshcha, 188300 Gatchina, Russia;
| | - Alexei Y. Bagrov
- Sechenov Institute of Evolutionary Physiology and Biochemistry, 44 Torez Prospect, 194223 St. Petersburg, Russia;
- Correspondence:
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Xu Y, Jiang X, Xu J, Qu W, Xie Z, Jiang RW, Feng F. A previously undescribed phenylethanoid glycoside from Callicarpa kwangtungensis Chun acts as an agonist of the Na/K-ATPase signal transduction pathway. Phytochemistry 2021; 181:112577. [PMID: 33190100 DOI: 10.1016/j.phytochem.2020.112577] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/18/2020] [Revised: 10/23/2020] [Accepted: 10/24/2020] [Indexed: 06/11/2023]
Abstract
The new concept that Na/K-ATPase acts as a receptor prompted us to look for new ligands from Callicarpa kwangtungensis Chun. Using column chromatography, an undescribed phenethyl alcohol glycoside, callicarpanoside A, and an undescribed benzyl alcohol glycoside, callicarpanoside B, along with twelve known polyphenols were isolated from Callicarpa kwangtungensis Chun. All the isolated compounds were evaluated for their Na/K-ATPase (NKA) inhibitory activities. Using our NKA technology platform-based screening assay protocols, callicarpanoside B was identified as an undescribed Na/K-ATPase agonist. In particular, the newly identified benzyl alcohol glycoside was found to bind NKA and activate the receptor NKA/Src complex, resulting in the activation of protein kinase cascades. These cascades included extracellular signal-regulated kinases and protein kinase C epsilon, as well as NKA α1 endocytosis at nanomolar concentrations. Unlike the class of cardiotonic steroids, callicarpanoside B showed less inhibition of NKA activity and caused less cellular toxicity. Moreover, callicarpanoside B was found to bind NKA at a different site other than the cardiotonic steroids binding site. Thus, we have identified an undescribed NKA α1 agonist that may be used to enhance the physiological processes of NKA α1 signaling.
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Affiliation(s)
- Yunhui Xu
- Marshall Institute for Interdisciplinary Research, Marshall University, Huntington, WV, 25701, United States
| | - Xueyang Jiang
- Department of Natural Medicinal Chemistry, China Pharmaceutical University, Nanjing, 210009, PR China; Jiangsu Food and Pharmaceutical Science College, Huai'an, 223003, PR China
| | - Jian Xu
- Department of Natural Medicinal Chemistry, China Pharmaceutical University, Nanjing, 210009, PR China; Jiangsu Food and Pharmaceutical Science College, Huai'an, 223003, PR China
| | - Wei Qu
- Department of Natural Medicinal Chemistry, China Pharmaceutical University, Nanjing, 210009, PR China; Jiangsu Food and Pharmaceutical Science College, Huai'an, 223003, PR China
| | - Zijian Xie
- Marshall Institute for Interdisciplinary Research, Marshall University, Huntington, WV, 25701, United States
| | - Ren-Wang Jiang
- Guangdong Province Key Laboratory of Pharmacodynamic Constituents of TCM and New Drugs Research, College of Pharmacy, Jinan University, Guangzhou, 510632, PR China; International Cooperative Laboratory of Traditional Chinese Medicine Modernization and Innovative Drug Development of Chinese Ministry of Education, College of Pharmacy, Jinan University, Guangzhou, 510632, PR China.
| | - Feng Feng
- Department of Natural Medicinal Chemistry, China Pharmaceutical University, Nanjing, 210009, PR China; Jiangsu Food and Pharmaceutical Science College, Huai'an, 223003, PR China.
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25
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Xie ZJ, Novograd J, Itzkowitz Y, Sher A, Buchen YD, Sodhi K, Abraham NG, Shapiro JI. The Pivotal Role of Adipocyte-Na K peptide in Reversing Systemic Inflammation in Obesity and COVID-19 in the Development of Heart Failure. Antioxidants (Basel) 2020; 9:E1129. [PMID: 33202598 DOI: 10.3390/antiox9111129] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [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: 10/19/2020] [Revised: 11/11/2020] [Accepted: 11/11/2020] [Indexed: 01/10/2023] Open
Abstract
This review summarizes data from several laboratories that have demonstrated a role of the Na/K-ATPase, specifically its α1 subunit, in the generation of reactive oxygen species (ROS) via the negative regulator of Src. Together with Src and other signaling proteins, the Na/K-ATPase forms an oxidant amplification loop (NKAL), amplifies ROS, and participates in cytokines storm in obesity. The development of a peptide fragment of the α1 subunit, NaKtide, has been shown to negatively regulate Src. Several groups showed that the systemic administration of the cell permeable modification of NaKtide (pNaKtide) or its selective delivery to fat tissue—adipocyte specific expression of NaKtide—ameliorate the systemic elevation of inflammatory cytokines seen in chronic obesity. Severe acute respiratory syndrome – coronavirus 2 (SARS-CoV-2), the RNA Coronavirus responsible for the COVID-19 global pandemic, invades cells via the angiotensin converting enzyme 2 (ACE-2) receptor (ACE2R) that is appended in inflamed fat tissue and exacerbates the formation of the cytokines storm. Both obesity and heart and renal failure are well known risks for adverse outcomes in patients infected with COVID-19. White adipocytes express ACE-2 receptors in high concentration, especially in obese patients. Once the virus invades the white adipocyte cell, it creates a COVID19–porphyrin complex which degrades and produces free porphyrin and iron and increases ROS. The increased formation of ROS and activation of the NKAL results in a further potentiated formation of ROS production, and ultimately, adipocyte generation of more inflammatory mediators, leading to systemic cytokines storm and heart failure. Moreover, chronic obesity also results in the reduction of antioxidant genes such as heme oxygenase-1 (HO-1), increasing adipocyte susceptibility to ROS and cytokines. It is the systemic inflammation and cytokine storm which is responsible for many of the adverse outcomes seen with COVID-19 infections in obese subjects, leading to heart failure and death. This review will also describe the potential antioxidant drugs and role of NaKtide and their demonstrated antioxidant effect used as a major strategy for improving obesity and epicardial fat mediated heart failure in the context of the COVID pandemic.
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Abstract
Active metabolites from natural sources are the predominant molecular targets in numerous biological studies owing to their appropriate compatibility with biological systems and desirable selective toxicities. Thus, their potential for therapeutic development could span a broad scope of disease areas, including pathological and neurological dysfunctions. Cardiac glycosides are a unique class of specialized metabolites that have been extensively applied as therapeutic agents for the treatment of numerous heart conditions, and more recently, they have also been explored as probable antitumor agents. They are a class of naturally derived compounds that bind to and inhibit Na+/K+-ATPase. This study presents cardiac glycosides and their analogues with highlights on their applications, challenges, and prospects as lead compounds for cancer treatment.
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Affiliation(s)
- Jude I. Ayogu
- Department of Pure & Industrial Chemistry, University of Nigeria, Nsukka 410001, Nigeria
- Department of Chemistry, School of Physical and Chemical Science, University of Canterbury, Christchurch 8041, New Zealand
| | - Amaechi S. Odoh
- Graduate School of Science, Tohoku University, Sendai 980-8578, Japan
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27
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Koç Ş, Baysal SS. Practical Method for Salt Intake Follow-Up in Hypertensive Patients. Metab Syndr Relat Disord 2020; 18:353-361. [PMID: 32580624 DOI: 10.1089/met.2020.0036] [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] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022] Open
Abstract
Background: Obese and hypertensive (HT) patients should restrict salt intake. In excessive salt intake, ouabain-like compounds inhibit Na/K-ATPase (Na+ pump), which increases intracellular Na+ and Ca2+. Ca2+ has a vasotonic effect on arteries and an inotropic effect on the heart and may cause cortical opacities in the lens. To our knowledge, there is still no practical method for salt intake follow-up. This study tested whether salt intake follow-up can be performed with the help of opacity tracking. Methods: In total, 400 HT patients (age 30-69 years) with cortical lens opacities were included in the study. Changes in opacities based on biomicroscopic examination at baseline and after 3 months were recorded digitally with the help of imaging software. Salt intake at 1 and 3 months was evaluated with a 24-hr urine Na assay. Changes in opacities were compared among group 1 (∼50% salt reduction), group 2 (∼10% salt reduction), and group 3 (∼15% salt increase). Results: Age and changes in small opacity diameter (SOD) and large opacity diameter (LOD) were the most important determinants of the 50% salt reduction in the third month. For changes in LOD, the sensitivity was 88.5% [confidence interval (95% CI) 85.2-91.7] and specificity was 95.5% (95% CI 93.1-98.7) for predicting a 50% salt restriction during the 3-month period. For SOD, the values were 85% (95% CI 82.5-87) and 95% (95% CI 92.3-97.5), respectively. Conclusions: Opacity changes are a practical method for predicting a 50% reduction in salt intake over a 3-month period in 30- to 59-year-old HT patients.
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Affiliation(s)
- Şahbender Koç
- Department of Cardiology, University of Health Sciences. Keçiören Education and Training Hospital, Ankara, Turkey
| | - Sadettin Selçuk Baysal
- Department of Cardiology, University of Health Sciences, Şanlıurfa Mehmet Akif İnan Education and Training Hospital, Urfa, Turkey
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28
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Geng X, Wang F, Tian D, Huang L, Streator E, Zhu J, Kurihara H, He R, Yao X, Zhang Y, Tang J. Cardiac glycosides inhibit cancer through Na/K-ATPase-dependent cell death induction. Biochem Pharmacol 2020; 182:114226. [PMID: 32976831 DOI: 10.1016/j.bcp.2020.114226] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [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: 07/06/2020] [Revised: 09/15/2020] [Accepted: 09/17/2020] [Indexed: 02/06/2023]
Abstract
Successful drug repurposing relies on the understanding of molecular mechanisms of the target compound. Cardiac glycosides have demonstrated potent anticancer activities; however, the pharmacological mechanisms underlying their anticancer effects remained elusive, which has restricted their further development in cancer treatment. A bottleneck is the lack of comprehensive understanding about genes and signaling pathways that are altered at the early stage of drug treatment, which is key to understand how they inhibit cancer. To address this issue, we first investigated the anticancer effects of a panel of 68 naturally isolated cardiac glycosides. Our results illustrate critical structure activity relationship of these compounds on cancer cell survival. We confirmed the anticancer effect of cardiac glycoside in mouse tumor xenografts. Through RNA sequencing, quantitative PCR and immunoblotting, we show that cardiac glycoside first activated autophagy and then induced apoptosis. Further activating autophagy by rapamycin or inhibiting apoptosis by caspase inhibitor mitigated cardiac glycoside-induced cell death, whereas inhibiting autophagy by RNA interference-mediated depletion of critical autophagy genes enhanced cell death. While depletion of Na/K-ATPase, the protein target of cardiac glycosides, by RNA interference inhibited both autophagy activation and apoptosis induction by cardiac glycoside, expression of human, but not rodent Na/K-ATPase, increased cell sensitivity to cardiac glycoside. In conclusion, our analyses reveal sequential activation of autophagy and apoptosis during early stages of cardiac glycoside treatment and indicate the importance of Na/K-ATPase in their anticancer effects.
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Affiliation(s)
- Xinran Geng
- Department of Pharmacology, Case Comprehensive Cancer Center, Case Western Reserve University School of Medicine, Cleveland, OH 44106, USA; Institute of Traditional Chinese Medicine and Natural Products, College of Pharmacy, Jinan University, Guangzhou 510632, People's Republic of China
| | - Fangfang Wang
- Institute of Traditional Chinese Medicine and Natural Products, College of Pharmacy, Jinan University, Guangzhou 510632, People's Republic of China; Guangdong Province Key Laboratory of Pharmacodynamic Constituents of TCM and New Drug Research, Jinan University, Guangzhou 510632, People's Republic of China
| | - Danmei Tian
- Institute of Traditional Chinese Medicine and Natural Products, College of Pharmacy, Jinan University, Guangzhou 510632, People's Republic of China; Guangdong Province Key Laboratory of Pharmacodynamic Constituents of TCM and New Drug Research, Jinan University, Guangzhou 510632, People's Republic of China
| | - Lihua Huang
- International Academic Support & Delivery Unit, BGI Genomics, Co., Ltd., Shenzhen 518083, People's Republic of China
| | - Evan Streator
- Department of Pharmacology, Case Comprehensive Cancer Center, Case Western Reserve University School of Medicine, Cleveland, OH 44106, USA
| | - Jingjing Zhu
- Institute of Traditional Chinese Medicine and Natural Products, College of Pharmacy, Jinan University, Guangzhou 510632, People's Republic of China; Guangdong Province Key Laboratory of Pharmacodynamic Constituents of TCM and New Drug Research, Jinan University, Guangzhou 510632, People's Republic of China
| | - Hiroshi Kurihara
- Anti-Stress and Health Research Center, College of Pharmacy, Jinan University, Guangzhou, Guangdong 510632, People's Republic of China
| | - Rongrong He
- Anti-Stress and Health Research Center, College of Pharmacy, Jinan University, Guangzhou, Guangdong 510632, People's Republic of China
| | - Xinsheng Yao
- Institute of Traditional Chinese Medicine and Natural Products, College of Pharmacy, Jinan University, Guangzhou 510632, People's Republic of China; Guangdong Province Key Laboratory of Pharmacodynamic Constituents of TCM and New Drug Research, Jinan University, Guangzhou 510632, People's Republic of China
| | - Youwei Zhang
- Department of Pharmacology, Case Comprehensive Cancer Center, Case Western Reserve University School of Medicine, Cleveland, OH 44106, USA.
| | - Jinshan Tang
- Institute of Traditional Chinese Medicine and Natural Products, College of Pharmacy, Jinan University, Guangzhou 510632, People's Republic of China; Guangdong Province Key Laboratory of Pharmacodynamic Constituents of TCM and New Drug Research, Jinan University, Guangzhou 510632, People's Republic of China.
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29
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Agalakova NI, Reznik VA, Nadei OV, Ershov IA, Rassokha OS, Vasyutina ML, Ivanov DO, Adair CD, Galagudza MM, Bagrov AY. Antibody against Na/K-ATPase Inhibitor Lowers Blood Pressure and Increases Vascular Fli1 in Experimental Preeclampsia. Am J Hypertens 2020; 33:514-519. [PMID: 31713584 DOI: 10.1093/ajh/hpz180] [Citation(s) in RCA: 3] [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: 08/30/2019] [Revised: 10/21/2019] [Accepted: 11/09/2019] [Indexed: 12/18/2022] Open
Abstract
BACKGROUND Previous studies implicated cardiotonic steroids, including Na/K-ATPase inhibitor marinobufagenin (MBG), in the pathogenesis of preeclampsia (PE). We demonstrated that MBG induces fibrosis via mechanism involving inhibition of Fli1, a nuclear transcription factor and a negative regulator of collagen-1 synthesis. We hypothesized that PE blockade of increased MBG with antibody would lessen the fibrosis of umbilical arteries and lower the blood pressure in rats with PE. METHODS We tested 36 pregnant Sprague-Dawley rats in which 12 were made hypertensive by 1.8% Na supplementation (days 6-19 of gestation), 12 pregnant rats served controls. At day 19, PE rats received one intraperitoneal injection of polyclonal anti-MBG-4 antibody (0.5 ug/ml) for 4 hours. RESULTS PE was associated with higher blood pressure (117 ± 2 vs. 107 ± 2 mm Hg; P < 0.01), plasma MBG levels (1.54 ± 0.34 vs. 0.49 ± 0.11 nmol/L; P < 0.01), protein excretion (26 vs. 12 mg/24 hours), sFlt-1 (3-fold), decrease in Fli1 (7-fold) and increase in collagen-1 in aorta (4-fold) vs. control rats (all P < 0.01). In 12 rats treated with polyclonal anti-MBG-4 antibody blood pressure dropped (93 ± 3 mm Hg) and Fli1 was decreased much less (2-fold; P < 0.01 vs. nontreated rats). CONCLUSIONS These results demonstrate that in experimental PE elevated MBG level is implicated in umbilical fibrosis via suppression of Fli1.
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Affiliation(s)
- Natalia I Agalakova
- Sechenov Institute of Evolutionary Physiology and Biochemistry, St. Petersburg, Russia
| | - Vitaly A Reznik
- Department of Obstetrics and Gynecology, St. Petersburg State Pediatric Medical University, St. Petersburg, Russia
| | - Olga V Nadei
- Sechenov Institute of Evolutionary Physiology and Biochemistry, St. Petersburg, Russia
| | - Ivan A Ershov
- Department of Obstetrics and Gynecology, St. Petersburg State Pediatric Medical University, St. Petersburg, Russia
| | - Olga S Rassokha
- Department of Obstetrics and Gynecology, St. Petersburg State Pediatric Medical University, St. Petersburg, Russia
| | - Marina L Vasyutina
- Institute of Experimental Medicine, Almazov National Medical Research Centre, St. Petersburg, Russia
| | - Dmitry O Ivanov
- Department of Obstetrics and Gynecology, St. Petersburg State Pediatric Medical University, St. Petersburg, Russia
| | - C David Adair
- Department of Obstetrics and Gynecology, University of Tennessee, Chattanooga, Tennessee, USA
| | - Michael M Galagudza
- Institute of Experimental Medicine, Almazov National Medical Research Centre, St. Petersburg, Russia
| | - Alexei Y Bagrov
- Sechenov Institute of Evolutionary Physiology and Biochemistry, St. Petersburg, Russia
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Liu J, Nie Y, Chaudhry M, Bai F, Chuang J, Sodhi K, Shapiro JI. The Redox-Sensitive Na/K-ATPase Signaling in Uremic Cardiomyopathy. Int J Mol Sci 2020; 21:ijms21041256. [PMID: 32069992 PMCID: PMC7072896 DOI: 10.3390/ijms21041256] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [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: 01/21/2020] [Revised: 02/10/2020] [Accepted: 02/10/2020] [Indexed: 02/07/2023] Open
Abstract
In recent years, Na/K-ATPase signaling has been implicated in different physiological and pathophysiological conditions, including cardiac hypertrophy and uremic cardiomyopathy. Cardiotonic steroids (CTS), specific ligands of Na/K-ATPase, regulate its enzymatic activity (at higher concentrations) and signaling function (at lower concentrations without significantly affecting its enzymatic activity) and increase reactive oxygen species (ROS) generation. On the other hand, an increase in ROS alone also regulates the Na/K-ATPase enzymatic activity and signaling function. We termed this phenomenon the Na/K-ATPase-mediated oxidant-amplification loop, in which oxidative stress regulates both the Na/K-ATPase activity and signaling. Most recently, we also demonstrated that this amplification loop is involved in the development of uremic cardiomyopathy. This review aims to evaluate the redox-sensitive Na/K-ATPase-mediated oxidant amplification loop and uremic cardiomyopathy.
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Affiliation(s)
- Jiang Liu
- Department of Biomedical Sciences, Joan C. Edwards School of Medicine, Marshall University, Huntington, WV 25755, USA; (Y.N.); (M.C.); (F.B.)
- Correspondence:
| | - Ying Nie
- Department of Biomedical Sciences, Joan C. Edwards School of Medicine, Marshall University, Huntington, WV 25755, USA; (Y.N.); (M.C.); (F.B.)
| | - Muhammad Chaudhry
- Department of Biomedical Sciences, Joan C. Edwards School of Medicine, Marshall University, Huntington, WV 25755, USA; (Y.N.); (M.C.); (F.B.)
| | - Fang Bai
- Department of Biomedical Sciences, Joan C. Edwards School of Medicine, Marshall University, Huntington, WV 25755, USA; (Y.N.); (M.C.); (F.B.)
| | - Justin Chuang
- Department of Medicine, Joan C. Edwards School of Medicine, Marshall University, Huntington, WV 25755, USA; (J.C.); (K.S.); (J.I.S.)
| | - Komal Sodhi
- Department of Medicine, Joan C. Edwards School of Medicine, Marshall University, Huntington, WV 25755, USA; (J.C.); (K.S.); (J.I.S.)
| | - Joseph I. Shapiro
- Department of Medicine, Joan C. Edwards School of Medicine, Marshall University, Huntington, WV 25755, USA; (J.C.); (K.S.); (J.I.S.)
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Fischer RA, Risner ML, Roux AL, Wareham LK, Sappington RM. Impairment of Membrane Repolarization Accompanies Axon Transport Deficits in Glaucoma. Front Neurosci 2019; 13:1139. [PMID: 31736686 PMCID: PMC6838637 DOI: 10.3389/fnins.2019.01139] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.4] [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: 07/24/2019] [Accepted: 10/09/2019] [Indexed: 12/12/2022] Open
Abstract
Glaucoma is a leading cause of blindness worldwide, resulting from degeneration of retinal ganglion cells (RGCs), which form the optic nerve. In glaucoma, axon transport deficits appear to precede structural degeneration of RGC axons. The period of time between the onset of axon transport deficits and the structural degeneration of RGC axons may represent a therapeutic window for the prevention of irreversible vision loss. However, it is unclear how deficits in axon transport relate to the electrophysiological capacity of RGCs to produce and maintain firing frequencies that encode visual stimuli. Here, we examined the electrophysiological signature of individual RGCs in glaucomatous retina with respect to axon transport facility. Utilizing the Microbead Occlusion Model of murine ocular hypertension, we performed electrophysiological recordings of RGCs with and without deficits in anterograde axon transport. We found that RGCs with deficits in axon transport have a reduced ability to maintain spiking frequency that arises from elongation of the repolarization phase of the action potential. This repolarization phenotype arises from reduced cation flux and K+ dyshomeostasis that accompanies pressure-induced decreases in Na/K-ATPase expression and activity. In vitro studies with purified RGCs indicate that elevated pressure induces early internalization of Na/K-ATPase that, when reversed, stabilizes cation flux and prevents K+ dyshomeostasis. Furthermore, pharmacological inhibition of the Na/K-ATPase is sufficient to replicate pressure-induced cation influx and repolarization phase phenotypes in healthy RGCs. These studies suggest that deficits in axon transport also likely reflect impaired electrophysiological function of RGCs. Our findings further identify a failure to maintain electrochemical gradients and cation dyshomeostasis as an early phenotype of glaucomatous pathology in RGCs that may have significant bearing on efforts to restore RGC health in diseased retina.
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Affiliation(s)
- Rachel A Fischer
- Department of Pharmacology, Vanderbilt University, Nashville, TN, United States
| | - Michael L Risner
- Vanderbilt Eye Institute, Vanderbilt University Medical Center, Nashville, TN, United States.,Department of Ophthalmology and Visual Sciences, Vanderbilt University School of Medicine, Nashville, TN, United States
| | - Abigail L Roux
- Vanderbilt Eye Institute, Vanderbilt University Medical Center, Nashville, TN, United States
| | - Lauren K Wareham
- Vanderbilt Eye Institute, Vanderbilt University Medical Center, Nashville, TN, United States
| | - Rebecca M Sappington
- Department of Pharmacology, Vanderbilt University, Nashville, TN, United States.,Vanderbilt Eye Institute, Vanderbilt University Medical Center, Nashville, TN, United States.,Department of Ophthalmology and Visual Sciences, Vanderbilt University School of Medicine, Nashville, TN, United States
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Hugosdottir R, Mørch CD, Jørgensen CK, Nielsen CW, Olsen MV, Pedersen MJ, Tigerholm J. Altered excitability of small cutaneous nerve fibers during cooling assessed with the perception threshold tracking technique. BMC Neurosci 2019; 20:47. [PMID: 31481024 PMCID: PMC6724327 DOI: 10.1186/s12868-019-0527-3] [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] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/24/2019] [Accepted: 08/22/2019] [Indexed: 11/10/2022] Open
Abstract
BACKGROUND There is a need for new approaches to increase the knowledge of the membrane excitability of small nerve fibers both in healthy subjects, as well as during pathological conditions. Our research group has previously developed the perception threshold tracking technique to indirectly assess the membrane properties of peripheral small nerve fibers. In the current study, a new approach for studying membrane excitability by cooling small fibers, simultaneously with applying a slowly increasing electrical stimulation current, is evaluated. The first objective was to examine whether altered excitability during cooling could be detected by the perception threshold tracking technique. The second objective was to computationally model the underlying ionic current that could be responsible for cold induced alteration of small fiber excitability. The third objective was to evaluate whether computational modelling of cooling and electrical simulation can be used to generate hypotheses of ionic current changes in small fiber neuropathy. RESULTS The excitability of the small fibers was assessed by the perception threshold tracking technique for the two temperature conditions, 20 °C and 32 °C. A detailed multi-compartment model was developed, including the ionic currents: NaTTXs, NaTTXr, NaP, KDr, KM, KLeak, KA, and Na/K-ATPase. The perception thresholds for the two long duration pulses (50 and 100 ms) were reduced when the skin temperature was lowered from 32 to 20 °C (p < 0.001). However, no significant effects were observed for the shorter durations (1 ms, p = 0.116; 5 ms p = 0.079, rmANOVA, Sidak). The computational model predicted that the reduction in the perception thresholds related to long duration pulses may originate from a reduction of the KLeak channel and the Na/K-ATPase. For short durations, the effect cancels out due to a reduction of the transient TTX resistant sodium current (Nav1.8). Additionally, the result from the computational model indicated that cooling simultaneously with electrical stimulation, may increase the knowledge regarding pathological alterations of ionic currents. CONCLUSION Cooling may alter the ionic current during electrical stimulation and thereby provide additional information regarding membrane excitability of small fibers in healthy subjects and potentially also during pathological conditions.
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Affiliation(s)
- Rosa Hugosdottir
- Center of Neuroplasticity and Pain, SMI®, Department of Health Science and Technology, Aalborg University, Fredrik Bajers Vej 7D3, 9220, Aalborg, Denmark
| | - Carsten Dahl Mørch
- Center of Neuroplasticity and Pain, SMI®, Department of Health Science and Technology, Aalborg University, Fredrik Bajers Vej 7D3, 9220, Aalborg, Denmark
| | - Cecilia Klitgaard Jørgensen
- Center of Neuroplasticity and Pain, SMI®, Department of Health Science and Technology, Aalborg University, Fredrik Bajers Vej 7D3, 9220, Aalborg, Denmark
| | - Camilla Winther Nielsen
- Center of Neuroplasticity and Pain, SMI®, Department of Health Science and Technology, Aalborg University, Fredrik Bajers Vej 7D3, 9220, Aalborg, Denmark
| | - Mathias Vassard Olsen
- Center of Neuroplasticity and Pain, SMI®, Department of Health Science and Technology, Aalborg University, Fredrik Bajers Vej 7D3, 9220, Aalborg, Denmark
| | - Mads Jozwiak Pedersen
- Center of Neuroplasticity and Pain, SMI®, Department of Health Science and Technology, Aalborg University, Fredrik Bajers Vej 7D3, 9220, Aalborg, Denmark
| | - Jenny Tigerholm
- Center of Neuroplasticity and Pain, SMI®, Department of Health Science and Technology, Aalborg University, Fredrik Bajers Vej 7D3, 9220, Aalborg, Denmark.
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Liu W, Luque M, Glueckert R, Danckwardt-Lillieström N, Nordström CK, Schrott-Fischer A, Rask-Andersen H. Expression of Na/K-ATPase subunits in the human cochlea: a confocal and super-resolution microscopy study with special reference to auditory nerve excitation and cochlear implantation. Ups J Med Sci 2019; 124:168-179. [PMID: 31460814 PMCID: PMC6758701 DOI: 10.1080/03009734.2019.1653408] [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] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/26/2022] Open
Abstract
Background: For the first time the expression of the ion transport protein sodium/potassium-ATPase and its isoforms was analyzed in the human cochlea using light- and confocal microscopy as well as super-resolution structured illumination microscopy. It may increase our understanding of its role in the propagation and processing of action potentials in the human auditory nerve and how electric nerve responses are elicited from auditory prostheses. Material and methods: Archival human cochlear sections were obtained from trans-cochlear surgeries. Antibodies against the Na/K-ATPase β1 isoform together with α1 and α3 were used for immunohistochemistry. An algorithm was applied to assess the expression in various domains. Results: Na/K ATPase β1 subunit was expressed, mostly combined with the α1 isoform. Neurons expressed the β1 subunit combined with α3, while satellite glial cells expressed the α1 isoform without recognized association with β1. Types I and II spiral ganglion neurons and efferent fibers expressed the Na/K-ATPase α3 subunit. Inner hair cells, nerve fibers underneath, and efferent and afferent fibers in the organ of Corti also expressed α1. The highest activity of Na/K-ATPase β1 was at the inner hair cell/nerve junction and spiral prominence. Conclusion: The human auditory nerve displays distinct morphologic features represented in its molecular expression. It was found that electric signals generated via hair cells may not go uninterrupted across the spiral ganglion, but are locally processed. This may be related to particular filtering properties in the human acoustic pathway.
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Affiliation(s)
- Wei Liu
- Department of Surgical Sciences, Section of Otolaryngology, Uppsala University Hospital, Uppsala, Sweden
- Wei Liu
| | - Maria Luque
- Department of Otolaryngology, Medical University of Innsbruck, Innsbruck, Austria
| | - Rudolf Glueckert
- Department of Otolaryngology, Medical University of Innsbruck, Innsbruck, Austria
| | | | - Charlotta Kämpfe Nordström
- Department of Surgical Sciences, Section of Otolaryngology, Uppsala University Hospital, Uppsala, Sweden
| | | | - Helge Rask-Andersen
- Department of Surgical Sciences, Head and Neck Surgery, Section of Otolaryngology, Uppsala University Hospital, Uppsala, Sweden
- CONTACT Helge Rask-Andersen Department of Surgical Sciences, Head and Neck Surgery, Section of Otolaryngology, Uppsala University Hospital, SE-751 85, Uppsala, Sweden
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Yan Y, Wang J, Chaudhry MA, Nie Y, Sun S, Carmon J, Shah PT, Bai F, Pratt R, Brickman C, Sodhi K, Kim JH, Pierre S, Malhotra D, Rankin GO, Xie ZJ, Shapiro JI, Liu J. Metabolic Syndrome and Salt-Sensitive Hypertension in Polygenic Obese TALLYHO/JngJ Mice: Role of Na/K-ATPase Signaling. Int J Mol Sci 2019; 20:ijms20143495. [PMID: 31315267 PMCID: PMC6678942 DOI: 10.3390/ijms20143495] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [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: 06/10/2019] [Revised: 07/06/2019] [Accepted: 07/13/2019] [Indexed: 12/12/2022] Open
Abstract
We have demonstrated that Na/K-ATPase acts as a receptor for reactive oxygen species (ROS), regulating renal Na+ handling and blood pressure. TALLYHO/JngJ (TH) mice are believed to mimic the state of obesity in humans with a polygenic background of type 2 diabetes. This present work is to investigate the role of Na/K-ATPase signaling in TH mice, focusing on susceptibility to hypertension due to chronic excess salt ingestion. Age-matched male TH and the control C57BL/6J (B6) mice were fed either normal diet or high salt diet (HS: 2, 4, and 8% NaCl) to construct the renal function curve. Na/K-ATPase signaling including c-Src and ERK1/2 phosphorylation, as well as protein carbonylation (a commonly used marker for enhanced ROS production), were assessed in the kidney cortex tissues by Western blot. Urinary and plasma Na+ levels were measured by flame photometry. When compared to B6 mice, TH mice developed salt-sensitive hypertension and responded to a high salt diet with a significant rise in systolic blood pressure indicative of a blunted pressure-natriuresis relationship. These findings were evidenced by a decrease in total and fractional Na+ excretion and a right-shifted renal function curve with a reduced slope. This salt-sensitive hypertension correlated with changes in the Na/K-ATPase signaling. Specifically, Na/K-ATPase signaling was not able to be stimulated by HS due to the activated baseline protein carbonylation, phosphorylation of c-Src and ERK1/2. These findings support the emerging view that Na/K-ATPase signaling contributes to metabolic disease and suggest that malfunction of the Na/K-ATPase signaling may promote the development of salt-sensitive hypertension in obesity. The increased basal level of renal Na/K-ATPase-dependent redox signaling may be responsible for the development of salt-sensitive hypertension in polygenic obese TH mice.
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Affiliation(s)
- Yanling Yan
- Departments of Clinical & Translational Sciences, Biomedical Sciences, and Medicine, Joan C. Edwards School of Medicine, Marshall University, Huntington, WV 25755, USA.
| | - Jiayan Wang
- Departments of Clinical & Translational Sciences, Biomedical Sciences, and Medicine, Joan C. Edwards School of Medicine, Marshall University, Huntington, WV 25755, USA
| | - Muhammad A Chaudhry
- Departments of Clinical & Translational Sciences, Biomedical Sciences, and Medicine, Joan C. Edwards School of Medicine, Marshall University, Huntington, WV 25755, USA
| | - Ying Nie
- Departments of Clinical & Translational Sciences, Biomedical Sciences, and Medicine, Joan C. Edwards School of Medicine, Marshall University, Huntington, WV 25755, USA
| | - Shuyan Sun
- Departments of Clinical & Translational Sciences, Biomedical Sciences, and Medicine, Joan C. Edwards School of Medicine, Marshall University, Huntington, WV 25755, USA
- Hebei Medical University, Shijiazhuang 50017, China
| | - Jazmin Carmon
- Departments of Clinical & Translational Sciences, Biomedical Sciences, and Medicine, Joan C. Edwards School of Medicine, Marshall University, Huntington, WV 25755, USA
| | - Preeya T Shah
- Departments of Clinical & Translational Sciences, Biomedical Sciences, and Medicine, Joan C. Edwards School of Medicine, Marshall University, Huntington, WV 25755, USA
| | - Fang Bai
- Departments of Clinical & Translational Sciences, Biomedical Sciences, and Medicine, Joan C. Edwards School of Medicine, Marshall University, Huntington, WV 25755, USA
| | - Rebecca Pratt
- Departments of Clinical & Translational Sciences, Biomedical Sciences, and Medicine, Joan C. Edwards School of Medicine, Marshall University, Huntington, WV 25755, USA
| | - Cameron Brickman
- Departments of Clinical & Translational Sciences, Biomedical Sciences, and Medicine, Joan C. Edwards School of Medicine, Marshall University, Huntington, WV 25755, USA
| | - Komal Sodhi
- Departments of Clinical & Translational Sciences, Biomedical Sciences, and Medicine, Joan C. Edwards School of Medicine, Marshall University, Huntington, WV 25755, USA
| | - Jung Han Kim
- Departments of Clinical & Translational Sciences, Biomedical Sciences, and Medicine, Joan C. Edwards School of Medicine, Marshall University, Huntington, WV 25755, USA
| | - Sandrine Pierre
- Departments of Clinical & Translational Sciences, Biomedical Sciences, and Medicine, Joan C. Edwards School of Medicine, Marshall University, Huntington, WV 25755, USA
| | - Deepak Malhotra
- Department of Medicine, The University of Toledo College of Medicine and Life Sciences, Toledo, OH 43614, USA
| | - Gary O Rankin
- Departments of Clinical & Translational Sciences, Biomedical Sciences, and Medicine, Joan C. Edwards School of Medicine, Marshall University, Huntington, WV 25755, USA
| | - Zi-Jian Xie
- Departments of Clinical & Translational Sciences, Biomedical Sciences, and Medicine, Joan C. Edwards School of Medicine, Marshall University, Huntington, WV 25755, USA
| | - Joseph I Shapiro
- Departments of Clinical & Translational Sciences, Biomedical Sciences, and Medicine, Joan C. Edwards School of Medicine, Marshall University, Huntington, WV 25755, USA
| | - Jiang Liu
- Departments of Clinical & Translational Sciences, Biomedical Sciences, and Medicine, Joan C. Edwards School of Medicine, Marshall University, Huntington, WV 25755, USA
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Rajamanickam GD, Kastelic JP, Thundathil JC. Testis-Specific Isoform of Na/K-ATPase (ATP1A4) Interactome in Raft and Non-Raft Membrane Fractions from Capacitated Bovine Sperm. Int J Mol Sci 2019; 20:E3159. [PMID: 31261667 PMCID: PMC6651793 DOI: 10.3390/ijms20133159] [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] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/05/2019] [Accepted: 05/16/2019] [Indexed: 11/28/2022] Open
Abstract
The plasma membrane of sperm contains highly dynamic lipid microdomains (rafts), which house signaling proteins with a role in regulating capacitation. We reported that ATP1A4, the testis-specific isoform of Na/K-ATPase, interacted with caveolin-1, Src, epidermal growth factor receptor (EGFR) and extracellular signal-regulated kinases 1/2 (ERK1/2) in raft and non-raft domains of the plasma membrane of bovine sperm during capacitation. The objective of the present study was to use a proteomic approach to characterize the ATP1A4 interactome in rafts and non-rafts from capacitated bovine sperm. The non-raft interactome included hexokinase 1, plakophilin 1, desmoglein 1, 14-3-3 protein ζ/δ, cathepsin D and heat shock protein beta1 proteins exclusively, whereas glutathione S-transferase and annexin A2 were unique to raft interactome. However, a disintegrin and metalloprotease 32 (ADAM 32), histone H4, actin, acrosin, serum albumin and plakoglobin were identified in both raft and non-raft fractions of capacitated sperm. Based on gene ontology studies, these differentially interacted proteins were implicated in cell-cell adhesion, signal transduction, fertilization, metabolism, proteolysis and DNA replication, in addition to acting as transport/carrier and cytoskeletal proteins. Overall, we identified proteins not previously reported to interact with ATP1A4; furthermore, we inferred that ATP1A4 may have a role in sperm capacitation.
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Affiliation(s)
- Gayathri D Rajamanickam
- Department of Veterinary Clinical and Diagnostic Services, Faculty of Veterinary Medicine, University of Calgary, Calgary, AB T2N 4N1, Canada
| | - John P Kastelic
- Department of Production Animal Health, Faculty of Veterinary Medicine, University of Calgary, Calgary, AB T2N 4N1, Canada
| | - Jacob C Thundathil
- Department of Production Animal Health, Faculty of Veterinary Medicine, University of Calgary, Calgary, AB T2N 4N1, Canada.
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Nepal N, Arthur S, Sundaram U. Unique Regulation of Na-K-ATPase during Growth and Maturation of Intestinal Epithelial Cells. Cells 2019; 8:cells8060593. [PMID: 31208048 PMCID: PMC6628168 DOI: 10.3390/cells8060593] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [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: 05/25/2019] [Revised: 06/09/2019] [Accepted: 06/13/2019] [Indexed: 12/25/2022] Open
Abstract
Na-K-ATPase on the basolateral membrane provides the favorable transcellular Na gradient for the proper functioning of Na-dependent nutrient co-transporters on the brush border membrane (BBM) of enterocytes. As cells mature from crypts to villus, Na-K-ATPase activity doubles, to accommodate for the increased BBM Na-dependent nutrient absorption. However, the mechanism of increased Na-K-ATPase activity during the maturation of enterocytes is not known. Therefore, this study aimed to determine the mechanisms involved in the functional transition of Na-K-ATPase during the maturation of crypts to villus cells. Na-K-ATPase activity gradually increased as IEC-18 cells matured in vitro from day 0 (crypts) through day 4 (villus) of post-confluence. mRNA abundance and Western blot studies showed no change in the levels of Na-K-ATPase subunits α1 and β1 from 0 to 4 days post-confluent cells. However, Na-K-ATPase α1 phosphorylation levels on serine and tyrosine, but not threonine, residues gradually increased. These data indicate that as enterocytes mature from crypt-like to villus-like in culture, the functional activity of Na-K-ATPase increases secondary to altered affinity of the α1 subunit to extracellular K+, in order to accommodate the functional preference of the intestinal cell type. This altered affinity is likely due to increased phosphorylation of the α1 subunit, specifically at serine and tyrosine residues.
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Affiliation(s)
- Niraj Nepal
- Department of Clinical and Translational Sciences and Appalachian Clinical and Translational Science Institute, Joan C. Edwards School of Medicine, Marshall University, 1600 Medical Center Drive, Huntington, WV 25701, USA.
| | - Subha Arthur
- Department of Clinical and Translational Sciences and Appalachian Clinical and Translational Science Institute, Joan C. Edwards School of Medicine, Marshall University, 1600 Medical Center Drive, Huntington, WV 25701, USA.
| | - Uma Sundaram
- Department of Clinical and Translational Sciences and Appalachian Clinical and Translational Science Institute, Joan C. Edwards School of Medicine, Marshall University, 1600 Medical Center Drive, Huntington, WV 25701, USA.
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Luan X, Wang H, Xiang Z, Ma Z, Zhao J, Feng Y, Shi Q, Yin J. Biomimicking Dual-Responsive Extracellular Matrix Restoring Extracellular Balance through the Na/K-ATPase Pathway. ACS Appl Mater Interfaces 2019; 11:21258-21267. [PMID: 31117462 DOI: 10.1021/acsami.9b05420] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/19/2023]
Abstract
Biomedical implant mimicking the physiological extracellular matrix (ECM) is a new strategy to modulate the cell microenvironment to improve implant integrity and longevity. However, the biomimicking ECM suffers from low sensitivity to pathological change and low efficiency to restore the physiological state in vivo. To overcome these problems, reactive oxygen species (ROS) and K+ dual-responsive micro-/nanofibers that encapsulate ascorbic acid-2-glucoside (AA-2G) are fabricated on an elastomer substrate with electrospinning to mimic the ECM. The strategy is based on the fact that ROS and K+ dual responsiveness enhance the sensitivity of the ECM to pathological changes and delivery of AA-2G from the ECM to cell membrane promotes reactivating Na/K-ATPase and shifting cellular diseased conditions to the normal state. We demonstrate that the ROS and K+-responsive tripolymer of poly(ethylene glycol)diacrylate, 1,2-ethanedithiol, and 4-nitrobenzo-18-crown-6-ether (PEGDA-EDT-BCAm) are synthesized successfully; the ECM composed of acylated poly(caprolactone)/PEGDA-EDT-BCAm/AA-2G micro-/nanofibers is prepared through reactive electrospinning; the ECM is sensitive to ROS and K+ concentration in the microenvironment to release AA-2G, which targets the membrane to remove the excessive ROS and reactivate Na/K-ATPase; as a result, the ECM reduces oxidative stress and restores the extracellular physiological state both in vitro and in vivo. This work provides basic principles to design an implant that can adjust the extracellular microenvironment while avoiding pathogenicity to improve implant integrity and longevity in vivo.
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Affiliation(s)
- Xingkun Luan
- State Key Laboratory of Polymer Physics and Chemistry, Changchun Institute of Applied Chemistry , Chinese Academy of Sciences , Changchun , Jilin 130022 , China
- Key Laboratory of Olefin Catalysis and Polymerization/Key Laboratory of Rubber-Plastics (QUST) of Shandong Provincial , Qingdao University of Science and Technology , Qingdao 266042 , P. R. China
| | - Haozheng Wang
- State Key Laboratory of Polymer Physics and Chemistry, Changchun Institute of Applied Chemistry , Chinese Academy of Sciences , Changchun , Jilin 130022 , China
- Key Laboratory of Olefin Catalysis and Polymerization/Key Laboratory of Rubber-Plastics (QUST) of Shandong Provincial , Qingdao University of Science and Technology , Qingdao 266042 , P. R. China
| | - Zehong Xiang
- State Key Laboratory of Polymer Physics and Chemistry, Changchun Institute of Applied Chemistry , Chinese Academy of Sciences , Changchun , Jilin 130022 , China
| | - Zhifang Ma
- State Key Laboratory of Polymer Physics and Chemistry, Changchun Institute of Applied Chemistry , Chinese Academy of Sciences , Changchun , Jilin 130022 , China
| | - Jiruo Zhao
- Key Laboratory of Olefin Catalysis and Polymerization/Key Laboratory of Rubber-Plastics (QUST) of Shandong Provincial , Qingdao University of Science and Technology , Qingdao 266042 , P. R. China
| | - Ying Feng
- Key Laboratory of Olefin Catalysis and Polymerization/Key Laboratory of Rubber-Plastics (QUST) of Shandong Provincial , Qingdao University of Science and Technology , Qingdao 266042 , P. R. China
| | - Qiang Shi
- State Key Laboratory of Polymer Physics and Chemistry, Changchun Institute of Applied Chemistry , Chinese Academy of Sciences , Changchun , Jilin 130022 , China
- University of Science and Technology of China , Hefei , Anhui 230026 , P. R. China
| | - Jinghua Yin
- State Key Laboratory of Polymer Physics and Chemistry, Changchun Institute of Applied Chemistry , Chinese Academy of Sciences , Changchun , Jilin 130022 , China
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Bashir SO. Concomitant administration of resveratrol and insulin protects against diabetes mellitus type-1-induced renal damage and impaired function via an antioxidant-mediated mechanism and up-regulation of Na +/K +-ATPase. Arch Physiol Biochem 2019; 125:104-113. [PMID: 29436859 DOI: 10.1080/13813455.2018.1437752] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.8] [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] [Indexed: 12/13/2022]
Abstract
This study investigated if a combination of resveratrol (RES) and insulin could reverse type 1 diabetic mellitus-induced (T1DM) nephropathy and illustrates mechanism of action. Rats were divided into six groups (n = 10/group) as follows: control, control + RES (20 mg/kg), T1DM, T1DM + RES, T1DM + insulin (1 U/g), and T1DM + RES + insulin and treated for eight weeks. While individual administrations of both drugs significantly but partially restored renal function and cortex architectures, combination therapy of both RES and insulin produced the maximum improvements. Mechanism of actions revealed a synergist effect of both drugs due to hypoglycaemic effect of insulin and the ability of both drugs to increase renal cortex antioxidant enzymes activities, inhibit lipid peroxidation, and up-regulate Na+/K+-ATPase, independent of each others. In conclusion, these data suggest the combined therapy with insulin and RES could provide an excellent combined drug therapy against T1DM-induced nephropathy.
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Affiliation(s)
- Salah O Bashir
- a Department of Physiology, College of Medicine , King Khalid University , Abha , Saudi Arabia
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Emelyanov IV, Konradi AO, Lakatta EG, Fedorova OV, Bagrov AY. Acute salt loading and cardiotonic steroids in resistant hypertension. Curr Top Membr 2019; 83:1-13. [PMID: 31196601 DOI: 10.1016/bs.ctm.2019.01.005] [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] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
Abstract
The study addresses the association of marinobufagenin (MBG), a natriuretic and vasoconstrictor steroid, and Na/K-ATPase (NKA) activity with pressor response to salt-loading and arterial stiffness in resistant hypertension (RH). Thirty-four patients (18 males and 16 females; 56±8 years) with RH on a combined (lisnopril/amlodipine/hydrochlorothiazide) therapy and 11 healthy age-matched normotensive subjects (7 males and 4 females; 54±2 years) were enrolled in this study. Salt-loading was performed via intravenous infusion of 1000mL saline (0.9% NaCl) for 1h. Arterial stiffness was measured by Sphygmocor Px device with a calculation of pulse-wave velocity (PWV). Activity of NKA was measured in erythrocytes. We demonstrated that plasma levels of MBG and magnitude of NaCl-induced MBG-dependent NKA inhibition are associated with PWV, and that this association has gender- and age-specific fashion in RH patients.
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Affiliation(s)
- Igor V Emelyanov
- Almazov Federal Heart, Blood and Endocrinology Centre, St. Petersburg, Russia
| | - Alexandra O Konradi
- Almazov Federal Heart, Blood and Endocrinology Centre, St. Petersburg, Russia
| | | | - Olga V Fedorova
- National Institute on Aging, NIH, Baltimore, MD, United States
| | - Alexei Y Bagrov
- National Institute on Aging, NIH, Baltimore, MD, United States; Sechenov Institute of Evolutionary Physiology and Biochemistry, St. Petersburg, Russia.
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Deriugina AV, Shumilova AV. [An influence of cytoflavin on oxidative stress and activity of Na/K-ATPase of erythrocytes after brain trauma]. Zh Nevrol Psikhiatr Im S S Korsakova 2018; 117:51-55. [PMID: 29265087 DOI: 10.17116/jnevro201711711151-55] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
Abstract
AIM To study the efficacy of cytoflavin in correction of oxidative stress and the activity of Na/K-ATPase in posttraumatic craniocerebral trauma (CCT) in rats. MATERIAL AND METHODS The study was performed on white non-linear female rats with a modeled CCT. An effect of cytoflavin on free radical oxidation and plasma antioxidant system, processes of plasma lipid peroxidation and antioxidant properties of red blood cells and erythrocyte Na/KATPases activity was studied on 1, 3, 7- and 12th day after CCT. RESULTS AND CONCLUSION CCT identified the growth of free-radical processes in blood plasma and an increase in lipid peroxidation in plasma and red blood cells as well as a reduction in the activity of catalase and Na/K-ATPase. Introduction of cytoflavin reduced oxidative stress from the 3rd day and normalized free radical oxidation and lipid peroxidation in plasma and red blood cells to the 7th day of the study against the background of the high total antioxidant capacity of blood and erythrocyte catalase activity. The effect of cytoflavin led to an increase in the activity of Na/K-ATPase on the 3rd-7th day of the study compared with the reduced activity of the enzyme in the control. Recovery of pro- and antioxidant balance under the action of cytoflavin associated with increased activity of Na/K-ATPase aimed at optimizing and reducing the homeostatic mechanisms of secondary damage in the post traumatic period.
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Affiliation(s)
- A V Deriugina
- Lobachevsky National Research Nizhny Novgorod State University, Nizhny Novgorod, Russia
| | - A V Shumilova
- Lobachevsky National Research Nizhny Novgorod State University, Nizhny Novgorod, Russia
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Pratt RD, Brickman CR, Cottrill CL, Shapiro JI, Liu J. The Na/K-ATPase Signaling: From Specific Ligands to General Reactive Oxygen Species. Int J Mol Sci 2018; 19:E2600. [PMID: 30200500 DOI: 10.3390/ijms19092600] [Citation(s) in RCA: 37] [Impact Index Per Article: 6.2] [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: 07/02/2018] [Revised: 08/10/2018] [Accepted: 08/28/2018] [Indexed: 12/16/2022] Open
Abstract
The signaling function of the Na/K-ATPase has been established for 20 years and is widely accepted in the field, with many excellent reports and reviews not cited here. Even though there is debate about the underlying mechanism, the signaling function is unquestioned. This short review looks back at the evolution of Na/K-ATPase signaling, from stimulation by cardiotonic steroids (also known as digitalis-like substances) as specific ligands to stimulation by reactive oxygen species (ROS) in general. The interplay of cardiotonic steroids and ROS in Na/K-ATPase signaling forms a positive-feedback oxidant amplification loop that has been implicated in some pathophysiological conditions.
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Fedorova OV, Ishkaraeva VV, Grigorova YN, Reznik VA, Kolodkin NI, Zazerskaya IE, Zernetkina V, Agalakova NI, Tapilskaya NI, Adair CD, Lakatta EG, Bagrov AY. Antibody to Marinobufagenin Reverses Placenta-Induced Fibrosis of Umbilical Arteries in Preeclampsia. Int J Mol Sci 2018; 19:ijms19082377. [PMID: 30104471 PMCID: PMC6121256 DOI: 10.3390/ijms19082377] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [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: 07/12/2018] [Revised: 08/04/2018] [Accepted: 08/07/2018] [Indexed: 02/01/2023] Open
Abstract
Background: Previous studies implicated cardiotonic steroids, including Na/K-ATPase inhibitor marinobufagenin (MBG), in the pathogenesis of preeclampsia (PE). Immunoneutralization of heightened MBG by Digibind, a digoxin antibody, reduces blood pressure (BP) in patients with PE, and anti-MBG monoclonal antibody lessens BP in a rat model of PE. Recently, we demonstrated that MBG induces fibrosis in cardiovascular tissues via a mechanism involving inhibition of Fli-1, a nuclear transcription factor and a negative regulator of collagen-1 synthesis. Objectives and Methods: We hypothesized that in PE, elevated placental MBG levels are associated with development of fibrosis in umbilical arteries. Eleven patients with PE (mean BP 124 ± 4 mmHg; age 29 ± 2 years; 39 weeks gest. age) and 10 gestational age-matched normal pregnant subjects (mean BP 92 ± 2 mmHg; controls) were enrolled in the clinical study. Results: PE was associated with a higher placental (0.04 ± 0.01 vs. 0.49 ± 0.11 pmol/g; p < 0.01) and plasma MBG (0.5 ± 0.1 vs. 1.6 ± 0.5 nmol/L; p < 0.01), lower Na/K-ATPase activity in erythrocytes (2.7 ± 0.2 vs. 1.5 ± 0.2 µmol Pi/mL/hr; p < 0.01), 9-fold decrease of Fli-1 level and 2.5-fold increase of collagen-1 in placentae (p < 0.01) vs. control. Incubation of umbilical arteries from control patients with 1 nmol/L MBG was associated with four-fold decrease in Fli-1 level and two-fold increase in collagen-1 level vs. those incubated with placebo (p < 0.01), i.e., physiological concentration of MBG mimicked effect of PE in vitro. Collagen-1 abundance in umbilical arteries from PE patients was 4-fold higher than in control arteries, and this PE-associated fibrosis was reversed by monoclonal anti-MBG antibody ex vivo. Conclusion: These results demonstrate that elevated placental MBG level is implicated in the development of fibrosis of the placenta and umbilical arteries in PE.
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Affiliation(s)
- Olga V Fedorova
- Laboratory of Cardiovascular Science, National Institute on Aging, NIH, Baltimore, MD 21224, USA.
| | - Valentina V Ishkaraeva
- Institute of Neonatology, Almazov Federal Heart, Blood and Endocrinology Center, St. Petersburg 197431, Russia.
| | - Yulia N Grigorova
- Laboratory of Cardiovascular Science, National Institute on Aging, NIH, Baltimore, MD 21224, USA.
| | - Vitaly A Reznik
- Department of Obstetrics and Gynecology, School of Pediatric Medicine, St. Petersburg 194353, Russia.
| | - Nikolai I Kolodkin
- Institute of Highly Pure Biopreparations, St. Petersburg 197110, Russia.
- Sechenov Institute of Evolutionary Physiology and Biochemistry, 44 Torez Prospect, St. Petersburg 194223, Russia.
| | - Irina E Zazerskaya
- Institute of Neonatology, Almazov Federal Heart, Blood and Endocrinology Center, St. Petersburg 197431, Russia.
| | - Valentina Zernetkina
- Laboratory of Cardiovascular Science, National Institute on Aging, NIH, Baltimore, MD 21224, USA.
| | - Natalia I Agalakova
- Sechenov Institute of Evolutionary Physiology and Biochemistry, 44 Torez Prospect, St. Petersburg 194223, Russia.
| | | | - C David Adair
- Department of Obstetrics and Gynecology, University of Tennessee, Chattanooga, TN 37403, USA.
| | - Edward G Lakatta
- Laboratory of Cardiovascular Science, National Institute on Aging, NIH, Baltimore, MD 21224, USA.
| | - Alexei Y Bagrov
- Sechenov Institute of Evolutionary Physiology and Biochemistry, 44 Torez Prospect, St. Petersburg 194223, Russia.
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Wang W, Shapiro JI. Quantum Modeling: A Bridge between the Pumping and Signaling Functions of Na/K-ATPase. Int J Mol Sci 2018; 19:E2347. [PMID: 30096926 DOI: 10.3390/ijms19082347] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [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: 07/11/2018] [Revised: 08/06/2018] [Accepted: 08/07/2018] [Indexed: 12/15/2022] Open
Abstract
Although the signaling function of Na/K-ATPase has been studied for decades, the chasm between the pumping function and the signaling function of Na/K-ATPase is still an open issue. This article explores the relationship between ion pumping and signaling with attention to the amplification of oxidants through this signaling function. We specifically consider the Na/K-ATPase with respect to its signaling function as a superposition of different states described for its pumping function. We then examine how alterations in the relative amounts of these states could alter signaling through the Src-EGFR-ROS pathway. Using assumptions based on some experimental observations published by our laboratories and others, we develop some predictions regarding cellular oxidant stress.
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Helseth AR, Hunanyan AS, Adil S, Linabarger M, Sachdev M, Abdelnour E, Arehart E, Szabo M, Richardson J, Wetsel WC, Hochgeschwender U, Mikati MA. Novel E815K knock-in mouse model of alternating hemiplegia of childhood. Neurobiol Dis 2018; 119:100-112. [PMID: 30071271 DOI: 10.1016/j.nbd.2018.07.028] [Citation(s) in RCA: 22] [Impact Index Per Article: 3.7] [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: 04/09/2018] [Revised: 07/05/2018] [Accepted: 07/28/2018] [Indexed: 01/30/2023] Open
Abstract
De novo mutations causing dysfunction of the ATP1A3 gene, which encodes the α3 subunit of Na+/K+-ATPase pump expressed in neurons, result in alternating hemiplegia of childhood (AHC). AHC manifests as paroxysmal episodes of hemiplegia, dystonia, behavioral abnormalities, and seizures. The first aim of this study was to characterize a novel knock-in mouse model (Atp1a3E815K+/-, Matoub, Matb+/-) containing the E815K mutation of the Atp1a3 gene recognized as causing the most severe and second most common phenotype of AHC with increased morbidity and mortality as compared to other mutations. The second aim was to investigate the effects of flunarizine, currently the most effective drug used in AHC, to further validate our model and to help address a question with significant clinical implications that has not been addressed in prior studies. Specifically, many E815K patients have clinical decompensation and catastrophic regression after discontinuing flunarizine therapy; however, it is not known whether this is congruent with the natural course of the disease and is a result of withdrawal from an acute beneficial effect, withdrawal from a long-term protective effect or from a detrimental effect of prior flunarizine exposure. Our behavioral and neurophysiological testing demonstrated that Matb+/- mice express a phenotype that bears a strong resemblance to the E815K phenotype in AHC. In addition, these mice developed spontaneous seizures with high incidence of mortality and required fewer electrical stimulations to reach the kindled state as compared to wild-type littermates. Matb+/- mice treated acutely with flunarizine had reduction in hemiplegic attacks as compared with vehicle-treated mice. After withdrawal of flunarizine, Matb+/- mice that had received flunarizine did neither better nor worse, on behavioral tests, than those who had received vehicle. We conclude that: 1) Our mouse model containing the E815K mutation manifests clinical and neurophysiological features of the most severe form of AHC, 2) Flunarizine demonstrated acute anti-hemiplegic effects but not long-term beneficial or detrimental behavioral effects after it was stopped, and 3) The Matb+/- mouse model can be used to investigate the underlying pathophysiology of ATP1A3 dysfunction and the efficacy of potential treatments for AHC.
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Affiliation(s)
- Ashley R Helseth
- Department of Pediatrics, Division of Pediatric Neurology, Duke University School of Medicine, Durham, NC 27710, USA; Department of Neurobiology, Duke University School of Medicine, Durham, NC 27710, USA
| | - Arsen S Hunanyan
- Department of Pediatrics, Division of Pediatric Neurology, Duke University School of Medicine, Durham, NC 27710, USA; Department of Neurobiology, Duke University School of Medicine, Durham, NC 27710, USA
| | - Syed Adil
- Department of Neurobiology, Duke University School of Medicine, Durham, NC 27710, USA
| | - Molly Linabarger
- Department of Neurobiology, Duke University School of Medicine, Durham, NC 27710, USA
| | - Monisha Sachdev
- Department of Pediatrics, Division of Pediatric Neurology, Duke University School of Medicine, Durham, NC 27710, USA
| | - Elie Abdelnour
- Department of Pediatrics, Division of Pediatric Neurology, Duke University School of Medicine, Durham, NC 27710, USA
| | - Eric Arehart
- Department of Pediatrics, Division of Pediatric Neurology, Duke University School of Medicine, Durham, NC 27710, USA; Department of Neurobiology, Duke University School of Medicine, Durham, NC 27710, USA
| | - Marlee Szabo
- Department of Pediatrics, Division of Pediatric Neurology, Duke University School of Medicine, Durham, NC 27710, USA
| | - Jordan Richardson
- Department of Pediatrics, Division of Pediatric Neurology, Duke University School of Medicine, Durham, NC 27710, USA
| | - William C Wetsel
- Department of Neurobiology, Duke University School of Medicine, Durham, NC 27710, USA; Department of Psychiatry and Behavioral Sciences, Duke University School of Medicine, Durham, NC 27710, USA; Department of Cell Biology, Duke University School of Medicine, Durham, NC 27710, USA
| | - Ute Hochgeschwender
- Department of Neurobiology, Duke University School of Medicine, Durham, NC 27710, USA; Department of Cell Biology, Duke University School of Medicine, Durham, NC 27710, USA
| | - Mohamad A Mikati
- Department of Pediatrics, Division of Pediatric Neurology, Duke University School of Medicine, Durham, NC 27710, USA; Department of Neurobiology, Duke University School of Medicine, Durham, NC 27710, USA.
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Fan X, Ashraf UM, Drummond CA, Shi H, Zhang X, Kumarasamy S, Tian J. Characterization of a Long Non-Coding RNA, the Antisense RNA of Na/K-ATPase α1 in Human Kidney Cells. Int J Mol Sci 2018; 19:ijms19072123. [PMID: 30037072 PMCID: PMC6073804 DOI: 10.3390/ijms19072123] [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] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/22/2018] [Revised: 07/17/2018] [Accepted: 07/19/2018] [Indexed: 01/19/2023] Open
Abstract
Non-coding RNAs are important regulators of protein-coding genes. The current study characterized an antisense long non-coding RNA, ATP1A1-AS1, which is located on the opposite strand of the Na/K-ATPase α1 gene. Our results show that four splice variants are expressed in human adult kidney cells (HK2 cells) and embryonic kidney cells (HEK293 cells). These variants can be detected in both cytosol and nuclear fractions. We also found that the inhibition of DNA methylation has a differential effect on the expression of ATP1A1-AS1 and its sense gene. To investigate the physiological role of this antisense gene, we overexpressed the ATP1A1-AS1 transcripts, and examined their effect on Na/K-ATPase expression and related signaling function in human kidney cells. The results showed that overexpression of the ATP1A1-AS1-203 transcript in HK2 cells reduced the Na/K-ATPase α1 (ATP1A1) gene expression by approximately 20% (p < 0.05), while reducing the Na/K-ATPase α1 protein synthesis by approximately 22% (p < 0.05). Importantly, overexpression of the antisense RNA transcript attenuated ouabain-induced Src activation in HK2 cells. It also inhibited the cell proliferation and potentiated ouabain-induced cell death. These results demonstrate that the ATP1A1-AS1 gene is a moderate negative regulator of Na/K-ATPase α1, and can modulate Na/K-ATPase-related signaling pathways in human kidney cells.
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Affiliation(s)
- Xiaoming Fan
- Department of Medicine, University of Toledo, Toledo, OH 43614, USA.
| | - Usman M Ashraf
- Department of Physiology and Pharmacology, Center for Hypertension and Personalized Medicine, University of Toledo, Toledo, OH 43614, USA.
| | - Christopher A Drummond
- Department of Medicine, University of Toledo, Toledo, OH 43614, USA.
- MPI Research, Mattawan, MI 49071, USA.
| | - Huilin Shi
- Department of Medicine, University of Toledo, Toledo, OH 43614, USA.
| | - Xiaolu Zhang
- Department of Medicine, University of Toledo, Toledo, OH 43614, USA.
| | - Sivarajan Kumarasamy
- Department of Physiology and Pharmacology, Center for Hypertension and Personalized Medicine, University of Toledo, Toledo, OH 43614, USA.
| | - Jiang Tian
- Department of Medicine, University of Toledo, Toledo, OH 43614, USA.
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Rajamanickam GD, Kastelic JP, Thundathil JC. The ubiquitous isoform of Na/K-ATPase (ATP1A1) regulates junctional proteins, connexin 43 and claudin 11 via Src-EGFR-ERK1/2-CREB pathway in rat Sertoli cells. Biol Reprod 2018; 96:456-468. [PMID: 28203706 DOI: 10.1095/biolreprod.116.141267] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.3] [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: 04/18/2016] [Revised: 11/10/2016] [Accepted: 12/13/2016] [Indexed: 01/03/2023] Open
Abstract
Interaction of Na/K-ATPase with its ligand ouabain has been implicated in the regulation of various biological processes. The objective was to investigate roles of Na/K-ATPase isoforms in formation and function of junctional complexes in Sertoli cells. Primary cultures of Sertoli cells were obtained by enzymatic digestion of 20-day-old rat testes and grown on Matrigel-coated dishes for 7 days. Sertoli cells predominantly expressed the ubiquitous isoform of Na/K-ATPase (ATP1A1), confirmed by immunoblotting, PCR, immunofluorescence, and mass spectrometry. Treatment of Sertoli cells with 50 nM ouabain increased transepithelial electrical resistance (TER) and expression of claudin 11 (tight junctions) and connexin 43 (gap junctions), whereas 1 mM ouabain had opposite effects. Involvement of Src-EGFR-ERK1/2-CREB pathway in ouabain-mediated expression of claudin 11 and connexin 43 was evaluated. Incubation of Sertoli cells with 50 nM ouabain increased content of p-Src, p-EGFR, p-ERK1/2, and p-CREB; in contrast, 1 mM ouabain decreased phosphorylation of these signaling molecules. Preincubation of Sertoli cells with inhibitors of Src and MAPK pathways inhibited ouabain-induced effects on these signaling molecules, TER, and expression of claudin 11 and connexin 43. In conclusion, we inferred that ATP1A1 regulated Sertoli cell tight junctions and gap junctions through the Src-EGFR-ERK1/2-CREB pathway. Ouabain is an endogenous steroid; therefore, its interaction with ATP1A1 may be a critical signaling mechanism for the regulation of Sertoli cell function and male fertility.
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Affiliation(s)
- Gayathri D Rajamanickam
- Department of Production Animal Health, Faculty of Veterinary Medicine, Heritage Medical Research Building RM 400, 3330 Hospital Drive NW, University of Calgary, Calgary, AB, Canada
| | - John P Kastelic
- Department of Production Animal Health, Faculty of Veterinary Medicine, Heritage Medical Research Building RM 400, 3330 Hospital Drive NW, University of Calgary, Calgary, AB, Canada
| | - Jacob C Thundathil
- Department of Production Animal Health, Faculty of Veterinary Medicine, Heritage Medical Research Building RM 400, 3330 Hospital Drive NW, University of Calgary, Calgary, AB, Canada
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Kashkin VA, Shekunova EV, Egorov AY, Bagrov AY. Marinobufagenin in Urine: A Potential Marker of Predisposition to Ethanol and a Target for Spironolactone. Curr Hypertens Rev 2018; 14:35-38. [PMID: 29437012 DOI: 10.2174/1573402114666180212115518] [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] [Received: 08/11/2017] [Revised: 01/30/2018] [Accepted: 01/31/2018] [Indexed: 11/22/2022]
Abstract
BACKGROUND AND OBJECTIVE Previously it was demonstrated that digitalis-like cardiotonic steroid, marinobufagenin (MBG), is implicated in the development of ethanol addiction in rats. We hypothesized that (i) levels of sodium pump ligand, MBG, would be negatively correlated with the amount of ethanol consumed by rats, and (ii) that spironolactone would oppose the MBG induced ethanol-seeking behavior and blood pressure in rats. METHODS Voluntary consumption of 9% alcohol (vs. water) during 10 days period by 11 adult male Wistar rats was studied. Eight weeks after the beginning of the experiment, the animals were divided into two treatment subgroups: high alcohol drinkers (HAD, n=6, daily consumption of ethanol > 4 g/kg) and low alcohol drinkers (LAD, n=5, daily consumption of ethanol < 4 g/kg) rats. Spironolactone treatment (7 days) was started following 3-day habituation to intragastric vehicle administration. Consumption of ethanol and blood pressure were recorded daily. RESULTS Urinary MBG excretion at baseline was 11.2±0.6 pmoles in HAD rats and 19.1±2.9 pmoles (p<0.05) in LAD rats, respectively. Seven days of spironolactone treatment was associated with reduction in ethanol intake (2.9 g/kg/24 hr), reduction in systolic blood pressure (5 mm Hg), and increase in sodium excretion (1 mmol/24 hr). CONCLUSION Levels of MBG may be a predisposing factor to voluntary ethanol intake. Spironolactone, along with antihypertensive effect, decreases ethanol intake.
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Affiliation(s)
- Vladimir A Kashkin
- Valdman Institute of Pharmacology, Pavlov Medical University, St. Petersburg, 197022, Russian Federation.,Sechenov Institute of Evolutionary Physiology and Biochemistry, St. Petersburg, 194223, Russian Federation
| | - Elena V Shekunova
- Valdman Institute of Pharmacology, Pavlov Medical University, St. Petersburg, 197022, Russian Federation
| | - Alexei Y Egorov
- Sechenov Institute of Evolutionary Physiology and Biochemistry, St. Petersburg, 194223, Russian Federation.,St. Petersburg State University, St. Petersburg, 199106, Russian Federation
| | - Alexei Y Bagrov
- Sechenov Institute of Evolutionary Physiology and Biochemistry, St. Petersburg, 194223, Russian Federation
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Liu J, Lilly MN, Shapiro JI. Targeting Na/K-ATPase Signaling: A New Approach to Control Oxidative Stress. Curr Pharm Des 2018; 24:359-364. [PMID: 29318961 PMCID: PMC6052765 DOI: 10.2174/1381612824666180110101052] [Citation(s) in RCA: 28] [Impact Index Per Article: 4.7] [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: 12/10/2017] [Revised: 12/27/2017] [Accepted: 01/04/2017] [Indexed: 01/13/2023]
Abstract
Renal and cardiac function are greatly affected by chronic oxidative stress which can cause many pathophysiological states. The Na/K-ATPase is well-described as an ion pumping enzyme involved in maintaining cellular ion homeostasis; however, in the past two decades, extensive research has been done to understand the signaling function of the Na/K-ATPase and determine its role in physiological and pathophysiological states. Our lab has shown that the Na/K-ATPase signaling cascade can function as an amplifier of reactive oxygen species (ROS) which can be initiated by cardiotonic steroids or increases in ROS. Regulation of systemic oxidative stress by targeting Na/K-ATPase signaling mediated oxidant amplification improves 5/6th partial nephrectomy (PNx) mediated uremic cardiomyopathy, renal sodium handling, as well as ameliorates adipogenesis. This review will present this new concept of Na/K-ATPase signaling mediated oxidant amplification loop and its clinic implication.
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Affiliation(s)
- Jiang Liu
- Department of Biomedical Sciences, Joan C. Edwards School of Medicine, Marshall University, Huntington, WV, United States
| | - Megan N Lilly
- Department of Biomedical Sciences, Joan C. Edwards School of Medicine, Marshall University, Huntington, WV, United States
| | - Joseph I Shapiro
- Department of Medicine, Joan C. Edwards School of Medicine, Marshall University, Huntington, WV, United States
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Schneider NFZ, Cerella C, Simões CMO, Diederich M. Anticancer and Immunogenic Properties of Cardiac Glycosides. Molecules 2017; 22:E1932. [PMID: 29117117 DOI: 10.3390/molecules22111932] [Citation(s) in RCA: 70] [Impact Index Per Article: 10.0] [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: 10/05/2017] [Revised: 10/29/2017] [Accepted: 11/04/2017] [Indexed: 12/25/2022] Open
Abstract
Cardiac glycosides (CGs) are natural compounds widely used in the treatment of several cardiac conditions and more recently have been recognized as potential antitumor compounds. They are known to be ligands for Na/K-ATPase, which is a promising drug target in cancer. More recently, in addition to their antitumor effects, it has been suggested that CGs activate tumor-specific immune responses. This review summarizes the anticancer aspects of CGs as new strategies for immunotherapy and drug repositioning (new horizons for old players), and the possible new targets for CGs in cancer cells.
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50
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Rajamanickam GD, Kastelic JP, Thundathil JC. Na/K-ATPase regulates bovine sperm capacitation through raft- and non-raft-mediated signaling mechanisms. Mol Reprod Dev 2017; 84:1168-1182. [PMID: 28833817 DOI: 10.1002/mrd.22879] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.7] [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: 10/23/2016] [Accepted: 08/09/2017] [Indexed: 11/06/2022]
Abstract
Highly dynamic lipid microdomains (rafts) in the sperm plasma membrane contain several signaling proteins that regulate sperm capacitation. Na/K-ATPase isoforms (testis-specific isoform ATP1A4 and ubiquitous isoform ATP1A1) are abundant in bovine sperm plasma membrane. We previously reported that incubation of bovine sperm with ouabain, a specific Na/K-ATPase ligand, induced tyrosine phosphorylation of several sperm proteins during capacitation. The objective of this study was to investigate the roles of lipid rafts and non-rafts in Na/K-ATPase enzyme activity and signaling during bovine sperm capacitation. Content of ATP1A4 and, to a lesser extent, ATP1A1 was increased in raft and non-raft fractions of capacitated sperm, although non-raft enzyme activities of both isoforms were higher than the corresponding activities in rafts from capacitated sperm. Yet, ATP1A4 was the predominant isoform responsible for total Na/K-ATPase activity in both rafts and non-rafts. A comparative increase in phosphorylation of signaling molecules was observed in both raft (CAV1) and non-raft (EGFR and ERK1/2) membrane fractions during capacitation. Although SRC was phosphorylated in both membrane fractions, the non-raft fraction possessed more of this activated form. We also inferred, by immunoprecipitation, that ATP1A4 interacted with CAV1 and EGFR in the raft fraction, whereas interactions of ATP1A4 with SRC, EGFR, and ERK1/2 occurred in the non-raft fraction of ouabain-capacitated sperm; conversely, ATP1A1 interacted only with CAV1 in both fractions of uncapacitated and capacitated sperm. In conclusion, both raft and non-raft cohorts of Na/K-ATPase isoforms contributed to phosphorylation of signaling molecules during bovine sperm capacitation.
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Affiliation(s)
- Gayathri D Rajamanickam
- Faculty of Veterinary Medicine, Department of Production Animal Health, University of Calgary, Calgary, Alberta, Canada
| | - John P Kastelic
- Faculty of Veterinary Medicine, Department of Production Animal Health, University of Calgary, Calgary, Alberta, Canada
| | - Jacob C Thundathil
- Faculty of Veterinary Medicine, Department of Production Animal Health, University of Calgary, Calgary, Alberta, Canada
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