151
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Lim Y, Lee V, Blanco A, Kelly SP, Unniappan S. Ion-poor water and dietary salt deprivation upregulate the ghrelinergic system in the goldfish (Carassius auratus). J Fish Biol 2021; 99:1100-1109. [PMID: 34080192 DOI: 10.1111/jfb.14814] [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] [Subscribe] [Scholar Register] [Received: 02/16/2021] [Revised: 05/20/2021] [Accepted: 05/24/2021] [Indexed: 06/12/2023]
Abstract
Because the ghrelinergic system in teleost fishes is broadly expressed in organs that regulate appetite as well as those that contribute to the regulation of salt and water balance, we hypothesized that manipulating salt and water balance in goldfish (Carassius auratus) would modulate the ghrelinergic system. Goldfish were acclimated to either freshwater (FW) or ion-poor FW (IPW) and were fed either a control diet containing 1% NaCl or low-salt diet containing 0.1% NaCl. Endpoints of salt and water balance, i.e., serum Na+ and Cl- levels, muscle moisture content and organ-specific Na+ -K+ -ATPase (NKA) activity, were examined in conjunction with brain, gill and gut mRNA abundance of preproghrelin and its receptor, growth hormone secretagogue receptor (ghs-r). Acclimation of fish to IPW reduced serum osmolality and Cl- levels and elevated kidney NKA activity, while FW fish fed a low NaCl diet exhibited a modest reduction in muscle moisture content but otherwise no apparent osmoregulatory disturbance. In contrast, a combined treatment of IPW acclimation and low dietary NaCl content reduced serum osmolality and Cl- levels, elevated muscle moisture content and increased gill, kidney and intestinal NKA activity. This intensified response to the combined effects of water and dietary ion deprivation is consistent with an increased effort to enhance ion acquisition. In association with these latter observations, a significant upregulation of preproghrelin mRNA expression in brain and gut was observed. A significant increase in ghs-r mRNAs was also observed in the gill of goldfish acclimated to IPW alone but a reduction in dietary NaCl content did not impact the ghrelinergic system of goldfish in FW. The results support the hypothesis that the ghrelinergic system is modulated in response to manipulated salt and water balance. Whether the central and peripheral ghrelinergic system contributes to ionic homeostasis in goldfish currently remains unclear and warrants further research.
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Affiliation(s)
- YouRee Lim
- Department of Biology, York University, Toronto, Ontario, Canada
| | - Vivienne Lee
- Department of Biology, York University, Toronto, Ontario, Canada
| | - Ayelen Blanco
- Laboratory of Integrative Neuroendocrinology, Department of Veterinary Biomedical Sciences, University of Saskatchewan, Saskatoon, Saskatchewan, Canada
| | - Scott P Kelly
- Department of Biology, York University, Toronto, Ontario, Canada
| | - Suraj Unniappan
- Laboratory of Integrative Neuroendocrinology, Department of Veterinary Biomedical Sciences, University of Saskatchewan, Saskatoon, Saskatchewan, Canada
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152
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Shang Y, Tian Y, Wang Y, Guo R. Novel lncRNA lncRNA001074 participates in the low salinity-induced response in the sea cucumber Apostichopus japonicus by targeting the let-7/NKAα axis. Cell Stress Chaperones 2021; 26:785-798. [PMID: 34291427 PMCID: PMC8492809 DOI: 10.1007/s12192-021-01207-3] [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] [Subscribe] [Scholar Register] [Received: 11/30/2020] [Revised: 03/22/2021] [Accepted: 04/13/2021] [Indexed: 01/18/2023] Open
Abstract
Salinity fluctuations have severe impacts on sea cucumbers and therefore important consequences in sea cucumber farming. The responses of sea cucumbers to salinity changes are reflected in the expression profiles of multiple genes and non-coding RNAs (ncRNAs). The microRNA (let-7) which is a developmental regulator, the ion transporter gene sodium potassium ATPase gene (NKAα), and the long ncRNA lncRNA001074 were previously shown to be involved in responses to salinity changes in various marine species. To better understand the relationship between ncRNAs and target genes, the let-7/NKAα/lncRNA001074 predicted interaction was investigated in this study using luciferase reporter assays and gene knockdowns in the sea cucumber Apostichopus japonicus. The results showed that NKAα was the target gene of let-7 and NKAα expression levels were inversely correlated with let-7 expression based on the luciferase reporter assays and western blots. The let-7 abundance was negatively regulated by lncRNA001074 and NKAα both in vitro and in vivo. Knockdown of lncRNA001074 led to let-7 overexpression. These results demonstrated that lncRNA001074 binds to the 3'-UTR binding site of let-7 in a regulatory manner. Furthermore, the expression profiles of let-7, NKAα, and lncRNA001074 were analyzed in sea cucumbers after the knockdown of each of these genes. The results found that lncRNA001074 competitively bound let-7 to suppress NKAα expression under low salinity conditions. The downregulation of let-7, in conjunction with the upregulation of lncRNA001074 and NKAα, may be essential for the response to low salinity change in sea cucumbers. Therefore, the dynamic balance of the lncRNA001074, NKAα, and let-7 network might be a potential response mechanism to salinity change in sea cucumbers.
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Affiliation(s)
- Yanpeng Shang
- Key Laboratory of Mariculture & Stock Enhancement in North China's Sea, Ministry of Agriculture, Dalian Ocean University, Heishijiao Street, No. 52, Dalian, 116023, China
| | - Yi Tian
- Key Laboratory of Mariculture & Stock Enhancement in North China's Sea, Ministry of Agriculture, Dalian Ocean University, Heishijiao Street, No. 52, Dalian, 116023, China.
| | - Yan Wang
- Key Laboratory of Mariculture & Stock Enhancement in North China's Sea, Ministry of Agriculture, Dalian Ocean University, Heishijiao Street, No. 52, Dalian, 116023, China
| | - Ran Guo
- Key Laboratory of Mariculture & Stock Enhancement in North China's Sea, Ministry of Agriculture, Dalian Ocean University, Heishijiao Street, No. 52, Dalian, 116023, China
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153
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António T, Cosme D, Igreja B, Fraga S, Serrão MP, Pires NM, Soares-da-Silva P. The role of salt-inducible kinases on the modulation of renal and intestinal Na +,K +-ATPase activity during short- and long-term high-salt intake. Eur J Pharmacol 2021; 904:174153. [PMID: 33989615 DOI: 10.1016/j.ejphar.2021.174153] [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] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/06/2021] [Revised: 04/24/2021] [Accepted: 04/30/2021] [Indexed: 11/29/2022]
Abstract
Type 1 salt-inducible kinases (SIK1) has been shown to act as a mediator during the cellular adaptation to variations in intracellular sodium in a variety of cell types. Type 2 SIK (SIK2) modulates various biological functions and acts as a signal transmitter in various pathways. To evaluate the role of both SIK isoforms in renal and intestinal Na+,K+-ATPase (NKA) activity, we made use of constitutive sik1-/- (SIK1-KO), sik2-/- (SIK2-KO), double sik1-/-sik2-/- (double SIK1*2-KO) knockout and wild-type (WT) mice challenged to a standard (0.3% NaCl) or chronic high-salt (HS, 8% NaCl) diet intake for 48 h or 12 weeks. Long-term HS intake in WT was accompanied by 2-fold increase in jejunal NKA activity and slight (~30% reduction) decreases in NKA in the ileum and cecum; none of these changes was accompanied by changes in the expression of α1-NKA. The ablation of SIK1 and SIK2 prevented the marked increase in jejunal NKA activity following the long-term HS intake. The ablation of SIK1 and SIK2 in mice on a long-term HS intake impacted differently in the ileum and cecum. The most interesting finding is that in SIK2-KO mice marked reductions in NKA activity were observed in the ileum and cecum when compared to WT mice, both on normal and long-term HS intake. In summary, SIK1 or SIK2 ablation on chronic high-salt intake is accompanied by modulation of NKA along the intestinal tract, which differ from those after an acute high-salt intake, and this may represent an absorptive compensatory mechanism to keep electrolyte homeostasis.
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Affiliation(s)
- Tatiana António
- Unit of Pharmacology and Therapeutics, Department of Biomedicine, Faculty of Medicine, University of Porto, 4200-319, Porto, Portugal; MedInUp - Center for Drug Discovery and Innovative Medicines, University of Porto, 4200-319, Porto, Portugal
| | - Dina Cosme
- Unit of Pharmacology and Therapeutics, Department of Biomedicine, Faculty of Medicine, University of Porto, 4200-319, Porto, Portugal; MedInUp - Center for Drug Discovery and Innovative Medicines, University of Porto, 4200-319, Porto, Portugal
| | - Bruno Igreja
- Division of Research and Development, BIAL-Portela & C(a), S.A, 4745-457, Coronado, Portugal
| | - Sónia Fraga
- Unit of Pharmacology and Therapeutics, Department of Biomedicine, Faculty of Medicine, University of Porto, 4200-319, Porto, Portugal; MedInUp - Center for Drug Discovery and Innovative Medicines, University of Porto, 4200-319, Porto, Portugal
| | - Maria Paula Serrão
- Unit of Pharmacology and Therapeutics, Department of Biomedicine, Faculty of Medicine, University of Porto, 4200-319, Porto, Portugal; MedInUp - Center for Drug Discovery and Innovative Medicines, University of Porto, 4200-319, Porto, Portugal
| | - Nuno M Pires
- Division of Research and Development, BIAL-Portela & C(a), S.A, 4745-457, Coronado, Portugal
| | - Patrício Soares-da-Silva
- Unit of Pharmacology and Therapeutics, Department of Biomedicine, Faculty of Medicine, University of Porto, 4200-319, Porto, Portugal; MedInUp - Center for Drug Discovery and Innovative Medicines, University of Porto, 4200-319, Porto, Portugal; Division of Research and Development, BIAL-Portela & C(a), S.A, 4745-457, Coronado, Portugal.
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154
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Laube M, Dornis D, Wenzel F, Thome UH. Epidermal growth factor strongly affects epithelial Na + transport and barrier function in fetal alveolar cells, with minor sex-specific effects. Sci Rep 2021; 11:15951. [PMID: 34354180 PMCID: PMC8342687 DOI: 10.1038/s41598-021-95410-y] [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] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/16/2020] [Accepted: 07/18/2021] [Indexed: 12/15/2022] Open
Abstract
Male sex remains an independent risk factor for respiratory distress syndrome (RDS) in preterm infants. Insufficient Na+ transport-mediated alveolar fluid clearance contributes to RDS development and we previously demonstrated sex-specific differences in Na+ transport. The epidermal growth factor (EGF) is important during fetal lung development with possible influence on Na+ transport. Sex-specific effects of EGF during surfactant synthesis were shown. We thus determined whether EGF exerts sex-specific effects on Na+ transport in fetal alveolar cells. We analyzed sex-specific fetal distal lung epithelial (FDLE) cells exposed to EGF and related ligands with Ussing chambers, RT-qPCR and Western blots. EGF strongly reduced the epithelial Na+ channel (ENaC) mRNA levels in both male and female FDLE cells. This was corroborated by a markedly reduced ENaC activity, while amiloride-insensitive pathways as well as barrier function were raised by EGF. In contrast to chronic effects, acute effects of EGF were sex-specific, because Na+ transport was reduced only in males. AKT phosphorylation was elevated only in female cells, while pERK1/2 was increased in both male and female cells. EGF showed certain sex- and time-dependent effects in FDLE cells. Nevertheless, the results suggest that EGF is an unlikely cause for the sex-specific differences in Na+ transport.
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Affiliation(s)
- Mandy Laube
- Department of Pediatrics, Division of Neonatology, Center for Pediatric Research Leipzig (CPL), University of Leipzig, Liebigstrasse 19, 04103, Leipzig, Germany.
| | - Diana Dornis
- Department of Pediatrics, Division of Neonatology, Center for Pediatric Research Leipzig (CPL), University of Leipzig, Liebigstrasse 19, 04103, Leipzig, Germany
| | - Fine Wenzel
- Department of Pediatrics, Division of Neonatology, Center for Pediatric Research Leipzig (CPL), University of Leipzig, Liebigstrasse 19, 04103, Leipzig, Germany
| | - Ulrich H Thome
- Department of Pediatrics, Division of Neonatology, Center for Pediatric Research Leipzig (CPL), University of Leipzig, Liebigstrasse 19, 04103, Leipzig, Germany
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155
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Ogawa Y, Saino O, Okinaka Y, Kikuchi-Taura A, Takeuchi Y, Taguchi A. Bone Marrow Mononuclear Cells Transplantation and Training Increased Transplantation of Energy Source Transporters in Chronic Stroke. J Stroke Cerebrovasc Dis 2021; 30:105932. [PMID: 34148020 DOI: 10.1016/j.jstrokecerebrovasdis.2021.105932] [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: 01/15/2021] [Revised: 05/16/2021] [Accepted: 05/31/2021] [Indexed: 10/21/2022] Open
Abstract
OBJECTIVES Bone marrow mononuclear cells (BM-MNC) show a significant therapeutic effect in combination with training even in the chronic phase of stroke. However, the mechanism of this combination therapy has not been investigated. Here, we examined its effects on brain metabolism in chronic stroke mice. MATERIALS AND METHODS BM-MNC (1x105 cells in 100 µL of phosphate-buffered saline) were intravenously transplanted at 4 weeks (chronic stage) after the middle cerebral artery occlusion. At 3 h and 10 weeks after the administration of BM-MNC, we evaluated transcription changes of the metabolism-related genes, hypoxia inducible factor 1-α (Hif-1α), prolyl hydroxylase 3 (Phd3), pyruvate dehydrogenase kinase 1 (Pdk1), Na+/K+-ATPase (Atp1α1‒3), connexins, glucose transporters, and monocarboxylate transporters, in the brain during chronic phase of stroke using quantitative polymerase chain reaction. RESULTS The results showed transcriptional activation of the metabolism-related genes in the contralateral cortex at 3 h after BM-MNC transplantation. Behavioral tests were performed after cell therapy, and the brain metabolism of mice with improved motor function was examined at 10 weeks after cell therapy. The therapeutic efficacy of the combination therapy with BM-MNC transplantation and training was evident in the form of transcriptional activation of ipsilateral anterior cerebral artery (ACA) cortex. CONCLUSIONS BM-MNC transplantation combined with training for chronic stroke activated gene expression in both the ipsilateral and the contralateral side.
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MESH Headings
- Animals
- Behavior, Animal
- Bone Marrow Cells/metabolism
- Bone Marrow Transplantation
- Brain/metabolism
- Brain/physiopathology
- Chronic Disease
- Combined Modality Therapy
- Connexins/genetics
- Connexins/metabolism
- Disease Models, Animal
- Energy Metabolism/genetics
- Gene Expression Regulation
- Hypoxia-Inducible Factor 1, alpha Subunit/genetics
- Hypoxia-Inducible Factor 1, alpha Subunit/metabolism
- Infarction, Middle Cerebral Artery/genetics
- Infarction, Middle Cerebral Artery/metabolism
- Infarction, Middle Cerebral Artery/physiopathology
- Infarction, Middle Cerebral Artery/therapy
- Male
- Membrane Transport Proteins/genetics
- Membrane Transport Proteins/metabolism
- Mice, Inbred C57BL
- Mice, SCID
- Motor Activity
- Physical Conditioning, Animal
- Recovery of Function
- Sodium-Potassium-Exchanging ATPase/genetics
- Sodium-Potassium-Exchanging ATPase/metabolism
- Transcription, Genetic
- Mice
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Affiliation(s)
- Yuko Ogawa
- Department of Regenerative Medicine Research, Foundation for Biomedical Research and Innovation at Kobe, Hyogo, Japan.
| | - Orie Saino
- Department of Regenerative Medicine Research, Foundation for Biomedical Research and Innovation at Kobe, Hyogo, Japan.
| | - Yuka Okinaka
- Department of Regenerative Medicine Research, Foundation for Biomedical Research and Innovation at Kobe, Hyogo, Japan.
| | - Akie Kikuchi-Taura
- Department of Regenerative Medicine Research, Foundation for Biomedical Research and Innovation at Kobe, Hyogo, Japan.
| | - Yukiko Takeuchi
- Department of Regenerative Medicine Research, Foundation for Biomedical Research and Innovation at Kobe, Hyogo, Japan.
| | - Akihiko Taguchi
- Department of Regenerative Medicine Research, Foundation for Biomedical Research and Innovation at Kobe, Hyogo, Japan.
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156
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Ceron FJM, Prodocimo V, Freire CA. Distribution of Na +/K +-ATPase-immunoreactive ionocytes varies between two superorders of ray-finned fish: Ostariophysi and Acanthopterygii. Fish Physiol Biochem 2021; 47:1063-1071. [PMID: 33999342 DOI: 10.1007/s10695-021-00963-4] [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] [Subscribe] [Scholar Register] [Received: 01/14/2021] [Accepted: 05/04/2021] [Indexed: 06/12/2023]
Abstract
Ray-finned fishes of the superorder Ostariophysi are primarily freshwater (FW), and normally stenohaline. Differently, fishes of the superorder Acanthopterygii are essentially marine, and frequently euryhaline, with some secondary FW. Na+/K+-ATPase-immunoreactive ionocytes were localized in the branchial epithelia of 4 species of Ostariophysi and 3 of Acanthopterygii. The Ostariophysi grass carp (Ctenopharyngodon idella, Cypriniformes), twospot Astyanax (Astyanax bimaculatus) and piracanjuba (Brycon orbignyanus), Characiformes, and the jundiá (Rhamdia quelen, Siluriformes), all from FW, displayed ionocytes in the filament plus secondary lamellae (F + SL). In their turn, all the three species of Acanthopterygii showed immunoreactive ionocytes in the filaments only (F). They were the Nile tilapia (Oreochromis niloticus, Cichliformes) in FW, the dog snapper (Lutjanus jocu, Perciformes) in seawater (SW), and the green puffer (Sphoeroides greeleyi, Tetraodontiformes) in SW. Ionocytes normally extend their distribution to the secondary lamellae (F + SL) in Ostariophysi. In Acanthopterygii, we find more plasticity: ionocytes are more frequently restricted to the filament in SW, but also spread to SL in FW. It may be that the occurrence of ionocytes in SL is the ancestral condition, but some euryhaline acanthopterygians rely on the space of the SL for placement of additional ionocytes when in FW absorbing salt. Our study contributed to the identification of the pattern of ionocyte distribution in gills of Ostariophysi in respect to that of Acanthopterygii.
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Affiliation(s)
- F Juliane M Ceron
- Departamento de Fisiologia, Setor de Ciências Biológicas, Universidade Federal do Paraná, Curitiba, Paraná, 81531-980, Brazil
| | - Viviane Prodocimo
- Departamento de Fisiologia, Setor de Ciências Biológicas, Universidade Federal do Paraná, Curitiba, Paraná, 81531-980, Brazil
| | - Carolina A Freire
- Departamento de Fisiologia, Setor de Ciências Biológicas, Universidade Federal do Paraná, Curitiba, Paraná, 81531-980, Brazil.
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157
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Ellingson PJ, Barnett WH, Kueh D, Vargas A, Calabrese RL, Cymbalyuk GS. Comodulation of h- and Na +/K + Pump Currents Expands the Range of Functional Bursting in a Central Pattern Generator by Navigating between Dysfunctional Regimes. J Neurosci 2021; 41:6468-6483. [PMID: 34103361 PMCID: PMC8318076 DOI: 10.1523/jneurosci.0158-21.2021] [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] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/21/2021] [Revised: 05/26/2021] [Accepted: 05/29/2021] [Indexed: 11/21/2022] Open
Abstract
Central pattern generators (CPGs), specialized oscillatory neuronal networks controlling rhythmic motor behaviors such as breathing and locomotion, must adjust their patterns of activity to a variable environment and changing behavioral goals. Neuromodulation adjusts these patterns by orchestrating changes in multiple ionic currents. In the medicinal leech, the endogenous neuromodulator myomodulin speeds up the heartbeat CPG by reducing the electrogenic Na+/K+ pump current and increasing h-current in pairs of mutually inhibitory leech heart interneurons (HNs), which form half-center oscillators (HN HCOs). Here we investigate whether the comodulation of two currents could have advantages over a single current in the control of functional bursting patterns of a CPG. We use a conductance-based biophysical model of an HN HCO to explain the experimental effects of myomodulin. We demonstrate that, in the model, comodulation of the Na+/K+ pump current and h-current expands the range of functional bursting activity by avoiding transitions into nonfunctional regimes, such as asymmetric bursting and plateau-containing seizure-like activity. We validate the model by finding parameters that reproduce temporal bursting characteristics matching experimental recordings from HN HCOs under control, three different myomodulin concentrations, and Cs+ treated conditions. The matching cases are located along the border of an asymmetric regime away from the border with more dangerous seizure-like activity. We found a simple comodulation mechanism with an inverse relation between the pump and h-currents makes a good fit of the matching cases and comprises a general mechanism for the robust and flexible control of oscillatory neuronal networks.SIGNIFICANCE STATEMENT Rhythm-generating neuronal circuits adjust their oscillatory patterns to accommodate a changing environment through neuromodulation. In different species, chemical messengers participating in such processes may target two or more membrane currents. In medicinal leeches, the neuromodulator myomodulin speeds up the heartbeat central pattern generator by reducing Na+/K+ pump current and increasing h-current. In a computational model, we show that this comodulation expands the range of central pattern generator's functional activity by navigating the circuit between dysfunctional regimes resulting in a much wider range of cycle period. This control would not be attainable by modulating only one current, emphasizing the synergy of combined effects. Given the prevalence of h-current and Na+/K+ pump current in neurons, similar comodulation mechanisms may exist across species.
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Affiliation(s)
- Parker J Ellingson
- Neuroscience Institute, Georgia State University, Atlanta, Georgia 30303
| | - William H Barnett
- Neuroscience Institute, Georgia State University, Atlanta, Georgia 30303
| | - Daniel Kueh
- Department of Biology, Emory University, Atlanta, Georgia 30322
| | - Alex Vargas
- Neuroscience Institute, Georgia State University, Atlanta, Georgia 30303
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158
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Bernhem K, Fontana JM, Svensson D, Zhang L, Nilsson LM, Scott L, Blom H, Brismar H, Aperia A. Super-resolution microscopy reveals that Na +/K +-ATPase signaling protects against glucose-induced apoptosis by deactivating Bad. Cell Death Dis 2021; 12:739. [PMID: 34315852 PMCID: PMC8316575 DOI: 10.1038/s41419-021-04025-8] [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] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/18/2020] [Revised: 07/14/2021] [Accepted: 07/14/2021] [Indexed: 11/08/2022]
Abstract
Activation of the apoptotic pathway is a major cause of progressive loss of function in chronic diseases such as neurodegenerative and diabetic kidney diseases. There is an unmet need for an anti-apoptotic drug that acts in the early stage of the apoptotic process. The multifunctional protein Na+,K+-ATPase has, in addition to its role as a transporter, a signaling function that is activated by its ligand, the cardiotonic steroid ouabain. Several lines of evidence suggest that sub-saturating concentrations of ouabain protect against apoptosis of renal epithelial cells, a common complication and major cause of death in diabetic patients. Here, we induced apoptosis in primary rat renal epithelial cells by exposing them to an elevated glucose concentration (20 mM) and visualized the early steps in the apoptotic process using super-resolution microscopy. Treatment with 10 nM ouabain interfered with the onset of the apoptotic process by inhibiting the activation of the BH3-only protein Bad and its translocation to mitochondria. This occurred before the pro-apoptotic protein Bax had been recruited to mitochondria. Two ouabain regulated and Akt activating Ca2+/calmodulin-dependent kinases were found to play an essential role in the ouabain anti-apoptotic effect. Our results set the stage for further exploration of ouabain as an anti-apoptotic drug in diabetic kidney disease as well as in other chronic diseases associated with excessive apoptosis.
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Affiliation(s)
- Kristoffer Bernhem
- Science for Life Laboratory, Department of Applied Physics, Royal Institute of Technology, Solna, Sweden
| | - Jacopo M Fontana
- Science for Life Laboratory, Department of Applied Physics, Royal Institute of Technology, Solna, Sweden
| | - Daniel Svensson
- Science for Life Laboratory, Department of Women's and Children's Health, Karolinska Institutet, Solna, Sweden
| | - Liang Zhang
- Science for Life Laboratory, Department of Women's and Children's Health, Karolinska Institutet, Solna, Sweden
| | - Linnéa M Nilsson
- Science for Life Laboratory, Department of Applied Physics, Royal Institute of Technology, Solna, Sweden
| | - Lena Scott
- Science for Life Laboratory, Department of Women's and Children's Health, Karolinska Institutet, Solna, Sweden
| | - Hans Blom
- Science for Life Laboratory, Department of Applied Physics, Royal Institute of Technology, Solna, Sweden
| | - Hjalmar Brismar
- Science for Life Laboratory, Department of Applied Physics, Royal Institute of Technology, Solna, Sweden.
- Science for Life Laboratory, Department of Women's and Children's Health, Karolinska Institutet, Solna, Sweden.
| | - Anita Aperia
- Science for Life Laboratory, Department of Women's and Children's Health, Karolinska Institutet, Solna, Sweden
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159
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Pullaiah CP, Nelson VK, Rayapu S, G V NK, Kedam T. Exploring cardioprotective potential of esculetin against isoproterenol induced myocardial toxicity in rats: in vivo and in vitro evidence. BMC Pharmacol Toxicol 2021; 22:43. [PMID: 34266475 PMCID: PMC8281642 DOI: 10.1186/s40360-021-00510-0] [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] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/01/2021] [Accepted: 05/27/2021] [Indexed: 12/13/2022] Open
Abstract
BACKGROUND Esculetin is a natural coumarin derivative from various plants with multiple pharmacological effects. Hence, the present study was undertaken to explore the cardio protective potential of esculetin against isoproterenol induced myocardial toxicity in rats. METHODS The treatment schedule was fixed for 28 days and the rats were divided into five groups of six each. Rats of group I received the normal saline and served as normal control, group II was received ISO (100 mg/kg body weight) for last two consecutive days of the study and served as disease control. Groups III and IV received esculetin 10 and 20 mg/kg body weight respectively once a day per oral for 28 days along with ISO for last two consecutive days of the study. Cardiac biomarkers such as CK-MB and LDH, membrane bound Na+ /K+ ATPases activity, myocardial lysosomal enzymes activity and tissue antioxidants status were estimated in the heart tissue samples. The histopathological changes in the myocardium were also assessed. Further, DPPH assay was done to evaluate the free radicals scavenging potential of esculetin. Cytoxicity assay, intracellular ROS levels by DCFDA assay and m-RNA expression of TNF-α, IL-6 and NF-κB by quantitative RT-PCR in H9c2 cell lines. RESULTS The increased levels of CK-MB, LDH, LPO, myocardial lysosomal enzymes and membrane bound Na+ /K+ ATPase levels by ISO administration was significantly increased with concomitant decrease in tissue antioxidant enzymes such as GSH, Catalase, and SOD. Pre-treatment with esculetin for 28 days has significantly decreased the levels of cardiac bio-markers, lysosomal enzymes, membrane bound Na+ /K+ ATPase levels as well as Lipid peroxides which is in contrary to the ISO group. Amelioration of the antioxidant levels were also found in esculetin treated groups. Histopathological examination of heart reveals that myocardial degeneration, mononuclear cell infiltration was noticed in ISO treated rats, whereas the same was restored with esculetin treatment. In H9C2 cell lines esculetin could effectively reduced intracellular ROS inhibition and m-RNA expression of pro-inflammatory cytokines including TNF-α, IL-6 and NF-κB to prevent apoptosis or cell necrosis. CONCLUSION The study provides the evidence of cardioprotective potentials of esculetin against isoproterenol induced myocardial infarction by antioxidant and myocardial membrane stabilization along with in vitro protection from arsenic induced ROS cell necrosis or apoptosis in H9C2 cells.
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Affiliation(s)
- Chitikela P Pullaiah
- Department of Pharmacology, Siddha Central Research Institute, Central Council for Research in Siddha, Ministry of AYUSH, Govt of India, Chennai, 600106, India.
- Department of Biochemistry and College of Pharmaceutical Sciences, S V University, Tirupati, 517502, India.
| | - Vinod K Nelson
- Department of Pharmacology & Toxicology, National Institute of Pharmaceutical Education and Research (NIPER), Hajipur, 844102, India.
| | - Sushma Rayapu
- Department of Pharmacology, Sri Padmavathi School of Pharmacy, Tirupati, 517503, India
| | - Narasimha Kumar G V
- Department of Pharmacology, Dr Anjali Chatterjee Regional Institute of Homeopathy, Kolkata, 700035, India
| | - Thyagaraju Kedam
- Department of Biochemistry and College of Pharmaceutical Sciences, S V University, Tirupati, 517502, India
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Asido M, Kar RK, Kriebel CN, Braun M, Glaubitz C, Schapiro I, Wachtveitl J. Transient Near-UV Absorption of the Light-Driven Sodium Pump Krokinobacter eikastus Rhodopsin 2: A Spectroscopic Marker for Retinal Configuration. J Phys Chem Lett 2021; 12:6284-6291. [PMID: 34213348 DOI: 10.1021/acs.jpclett.1c01436] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/13/2023]
Abstract
We report a transient signature in the near-UV absorption of Krokinobacter eikastus rhodopsin 2 (KR2), which spans from the femtosecond up to the millisecond time scale. The signature rises with the all-trans to 13-cis isomerization of retinal and decays with the reisomerization to all-trans in the late photocycle, making it a promising marker band for retinal configuration. Hybrid quantum mechanics/molecular mechanics simulations show that the near-UV absorption signal corresponds to an S0 → S3 and/or an S0 → S5 transition, which is present in all photointermediates. These transitions exhibit a negligible spectral shift by the altering protein environment, in contrast to the main absorption band. This is rationalized by the extension of the transition densities that omits the Schiff base nitrogen. Further characterization and first steps into possible optogenetic applications were performed with near-UV quenching experiments of an induced photostationary state, yielding an ultrafast regeneration of the parent state of KR2.
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Affiliation(s)
- Marvin Asido
- Institute of Physical and Theoretical Chemistry, Goethe University Frankfurt, Max-von-Laue Straße 7, 60438 Frankfurt am Main, Germany
| | - Rajiv K Kar
- Fritz Haber Center for Molecular Dynamics Research at the Institute of Chemistry, The Hebrew University of Jerusalem, 9190401 Jerusalem, Israel
| | - Clara Nassrin Kriebel
- Institute for Biophysical Chemistry and Center for Biomolecular Magnetic Resonance (BMRZ), Goethe University Frankfurt, Max-von-Laue Straße 9, 60438 Frankfurt am Main, Germany
| | - Markus Braun
- Institute of Physical and Theoretical Chemistry, Goethe University Frankfurt, Max-von-Laue Straße 7, 60438 Frankfurt am Main, Germany
| | - Clemens Glaubitz
- Institute for Biophysical Chemistry and Center for Biomolecular Magnetic Resonance (BMRZ), Goethe University Frankfurt, Max-von-Laue Straße 9, 60438 Frankfurt am Main, Germany
| | - Igor Schapiro
- Fritz Haber Center for Molecular Dynamics Research at the Institute of Chemistry, The Hebrew University of Jerusalem, 9190401 Jerusalem, Israel
| | - Josef Wachtveitl
- Institute of Physical and Theoretical Chemistry, Goethe University Frankfurt, Max-von-Laue Straße 7, 60438 Frankfurt am Main, Germany
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161
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Nepal N, Arthur S, Butts MR, Singh S, Palaniappan B, Sundaram U. Molecular Mechanism of Stimulation of Na-K-ATPase by Leukotriene D4 in Intestinal Epithelial Cells. Int J Mol Sci 2021; 22:ijms22147569. [PMID: 34299188 PMCID: PMC8303499 DOI: 10.3390/ijms22147569] [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] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/24/2021] [Revised: 07/02/2021] [Accepted: 07/07/2021] [Indexed: 12/03/2022] Open
Abstract
Na-K-ATPase provides a favorable transcellular Na gradient required for the functioning of Na-dependent nutrient transporters in intestinal epithelial cells. The primary metabolite for enterocytes is glutamine, which is absorbed via Na-glutamine co-transporter (SN2; SLC38A5) in intestinal crypt cells. SN2 activity is stimulated during chronic intestinal inflammation, at least in part, secondarily to the stimulation of Na-K-ATPase activity. Leukotriene D4 (LTD4) is known to be elevated in the mucosa during chronic enteritis, but the way in which it may regulate Na-K-ATPase is not known. In an in vitro model of rat intestinal epithelial cells (IEC-18), Na-K-ATPase activity was significantly stimulated by LTD4. As LTD4 mediates its action via Ca-dependent protein kinase C (PKC), Ca levels were measured and were found to be increased. Phorbol 12-myristate 13-acetate (PMA), an activator of PKC, also mediated stimulation of Na-K-ATPase like LTD4, while BAPTA-AM (Ca chelator) and calphostin-C (Cal-C; PKC inhibitor) prevented the stimulation of Na-K-ATPase activity. LTD4 caused a significant increase in mRNA and plasma membrane protein expression of Na-K-ATPase α1 and β1 subunits, which was prevented by calphostin-C. These data demonstrate that LTD4 stimulates Na-K-ATPase in intestinal crypt cells secondarily to the transcriptional increase of Na-K-ATPase α1 and β1 subunits, mediated via the Ca-activated PKC pathway.
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162
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Liu Z, Lv J, Zhang Z, Wang B, Duan L, Li C, Xie H, Li T, Zhou X, Xu R, Chen N, Liu W, Ming H. The main mechanisms of trimethyltin chloride-induced neurotoxicity: Energy metabolism disorder and peroxidation damage. Toxicol Lett 2021; 345:67-76. [PMID: 33865920 DOI: 10.1016/j.toxlet.2021.04.008] [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] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/06/2020] [Revised: 02/23/2021] [Accepted: 04/13/2021] [Indexed: 12/21/2022]
Abstract
Trimethyltin chloride (TMT) is a by-product in the synthesis of organotin, a plastic stabilizer. With the rapid development of industry, the occupational hazards caused by TMT cannot be ignored. TMT is a typical neurotoxicant, which mainly damages the limbic system and brainstem of the nervous system. Previous studies have demonstrated that the neurotoxicity induced by TMT is linked to the inhibition of energy metabolism, but the underlying mechanism remains elusive. In order to investigate the mechanism of TMT-induced inhibition of energy metabolism, C57BL/6 male mice were administered by IP injection in different TMT doses (0 mg/kg, 1.00 mg/kg, 2.15 mg/kg and 4.64 mg/kg) and times (1d, 3d and 6d), and then the changes of superoxide dismutase (SOD) activity, malondialdehyde (MDA) level and Na+-K+-ATPase activity in cerebral cortex, cerebellum, hippocampus, pons, medulla oblongata of mice, the expressions of Na+-K+-ATPase protein, AMP-activated protein kinase (AMPK), phosphorylated AMP-activated protein kinase(p-AMPK)and peroxisome proliferator-activated receptor γ coactivator-1 α (PGC-1α) in hippocampus and medulla oblongata were measured; the effects of TMT on the viability, the activity of SOD, glutathione (GSH) and Na+-K+-ATPase, MDA level, and the expression of PGC-1α and Na+-K+-ATPase protein in N2a cells were measured by different TMT doses and times, in order to verify the experiments in vivo. Our results found that most of the mice showed depression, tremor, epilepsy, spasm and other symptoms after TMT exposure. Moreover, with the increase of TMT dose, the activity of Na+-K+-ATPase and the expressions of AMPK protein in the hippocampus and medulla oblongata of mice decreased, and the expressions of p-AMPK protein increased. Peroxidative damage was evident in hippocampus, medulla oblongata of mice and N2a cells, and the expression of PGC-1α and Na+-K+-ATPase protein was significantly down-regulated. Therefore, it is reasonable to believe that TMT-induced neurotoxic symptoms and inhibition of energy metabolism may be related to p-AMPK and down-regulation of PGC-1α in the hippocampus and medulla oblongata.
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Affiliation(s)
- Zhenzhong Liu
- Department of Preventive Medicine, North Sichuan Medical College, Nanchong, 637000, China; Innovative Platform of Basic Medical Sciences, School of Basic Medical Sciences, North Sichuan Medical College, Nanchong, 637000, China.
| | - Jiaqi Lv
- National Institute for Occupational Health and Poison Control, Chinese Center for Disease Control and Prevention, Beijing, 100050, China
| | - Zhuangyu Zhang
- Department of Preventive Medicine, North Sichuan Medical College, Nanchong, 637000, China
| | - Bo Wang
- Department of Preventive Medicine, North Sichuan Medical College, Nanchong, 637000, China
| | - Lili Duan
- Department of Preventive Medicine, North Sichuan Medical College, Nanchong, 637000, China
| | - Cuihua Li
- Department of Preventive Medicine, North Sichuan Medical College, Nanchong, 637000, China
| | - Haiyue Xie
- Department of Preventive Medicine, North Sichuan Medical College, Nanchong, 637000, China
| | - Tongxing Li
- Department of Preventive Medicine, North Sichuan Medical College, Nanchong, 637000, China
| | - Xuemei Zhou
- Department of Preventive Medicine, North Sichuan Medical College, Nanchong, 637000, China
| | - Rui Xu
- Department of Preventive Medicine, North Sichuan Medical College, Nanchong, 637000, China
| | - Na Chen
- Department of Preventive Medicine, North Sichuan Medical College, Nanchong, 637000, China
| | - Wenhu Liu
- School of Pharmacy, North Sichuan Medical College, Nanchong, 637000, China
| | - Huang Ming
- Guangdong Province Hospital for Occupational Disease Prevention and Treatment, Guangzhou, 510300, China.
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Mohammadi S, Yang L, Harpak A, Herrera-Álvarez S, Del Pilar Rodríguez-Ordoñez M, Peng J, Zhang K, Storz JF, Dobler S, Crawford AJ, Andolfatto P. Concerted evolution reveals co-adapted amino acid substitutions in Na +K +-ATPase of frogs that prey on toxic toads. Curr Biol 2021; 31:2530-2538.e10. [PMID: 33887183 DOI: 10.1016/j.cub.2021.03.089] [Citation(s) in RCA: 9] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/05/2021] [Revised: 03/12/2021] [Accepted: 03/26/2021] [Indexed: 11/18/2022]
Abstract
Although gene duplication is an important source of evolutionary innovation, the functional divergence of duplicates can be opposed by ongoing gene conversion between them. Here, we report on the evolution of a tandem duplication of Na+,K+-ATPase subunit α1 (ATP1A1) shared by frogs in the genus Leptodactylus, a group of species that feeds on toxic toads. One ATP1A1 paralog evolved resistance to toad toxins although the other retained ancestral susceptibility. Within species, frequent non-allelic gene conversion homogenized most of the sequence between the two copies but was counteracted by strong selection on 12 amino acid substitutions that distinguish the two paralogs. Protein-engineering experiments show that two of these substitutions substantially increase toxin resistance, whereas the additional 10 mitigate their deleterious effects on ATPase activity. Our results reveal how examination of neo-functionalized gene duplicate evolution can help pinpoint key functional substitutions and interactions with the genetic backgrounds on which they arise.
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Affiliation(s)
- Shabnam Mohammadi
- School of Biological Sciences, University of Nebraska, Lincoln, NE, USA
| | - Lu Yang
- Department of Ecology and Evolutionary Biology, Princeton University, Princeton, NJ, USA
| | - Arbel Harpak
- Department of Biological Sciences, Columbia University, New York, NY, USA
| | | | | | - Julie Peng
- Lewis-Sigler Institute, Princeton University, Princeton, NJ, USA
| | - Karen Zhang
- Department of Ecology and Evolutionary Biology, Princeton University, Princeton, NJ, USA
| | - Jay F Storz
- School of Biological Sciences, University of Nebraska, Lincoln, NE, USA
| | - Susanne Dobler
- Molecular Evolutionary Biology, Zoological Institute, Universität Hamburg, Hamburg, Germany
| | - Andrew J Crawford
- Department of Biological Sciences, Universidad de los Andes, Bogotá 111711, Colombia.
| | - Peter Andolfatto
- Department of Biological Sciences, Columbia University, New York, NY, USA.
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Brownfoot FC. Uncovering the Molecular Cause of Preeclampsia-The Role of Glutathionylation of the Na+/K+ ATPase Transporter. J Clin Endocrinol Metab 2021; 106:e2830-e2832. [PMID: 33616648 DOI: 10.1210/clinem/dgab117] [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: 02/09/2021] [Indexed: 11/19/2022]
Affiliation(s)
- Fiona Claire Brownfoot
- Translational Obstetrics Group, Mercy Perinatal, Department of Obstetrics and Gynaecology, University of Melbourne, Mercy Hospital for Women, Heidelberg 3084, Victoria, Australia
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165
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Kim YJ, Lee JS, Kim H, Jang JH, Choung YH. Gap Junction-Mediated Intercellular Communication of cAMP Prevents CDDP-Induced Ototoxicity via cAMP/PKA/CREB Pathway. Int J Mol Sci 2021; 22:6327. [PMID: 34199197 PMCID: PMC8231879 DOI: 10.3390/ijms22126327] [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] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/14/2021] [Revised: 06/07/2021] [Accepted: 06/10/2021] [Indexed: 02/06/2023] Open
Abstract
In the cochlea, non-sensory supporting cells are directly connected to adjacent supporting cells via gap junctions that allow the exchange of small molecules. We have previously shown that the pharmacological regulation of gap junctions alleviates cisplatin (CDDP)-induced ototoxicity in animal models. In this study, we aimed to identify specific small molecules that pass through gap junctions in the process of CDDP-induced auditory cell death and suggest new mechanisms to prevent hearing loss. We found that the cyclic adenosine monophosphate (cAMP) inducer forskolin (FSK) significantly attenuated CDDP-induced auditory cell death in vitro and ex vivo. The activation of cAMP/PKA/CREB signaling was observed in organ of Corti primary cells treated with FSK, especially in supporting cells. Co-treatment with gap junction enhancers such as all-trans retinoic acid (ATRA) and quinoline showed potentiating effects with FSK on cell survival via activation of cAMP/PKA/CREB. In vivo, the combination of FSK and ATRA was more effective for preventing ototoxicity compared to either single treatment. Our study provides the new insight that gap junction-mediated intercellular communication of cAMP may prevent CDDP-induced ototoxicity.
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Affiliation(s)
- Yeon Ju Kim
- Department of Otolaryngology, Ajou University School of Medicine, Suwon 16499, Korea; (Y.J.K.); (H.K.); (J.H.J.)
| | - Jin-Sol Lee
- Department of Medical Sciences, Ajou University Graduate School of Medicine, Suwon 16499, Korea;
| | - Hantai Kim
- Department of Otolaryngology, Ajou University School of Medicine, Suwon 16499, Korea; (Y.J.K.); (H.K.); (J.H.J.)
| | - Jeong Hun Jang
- Department of Otolaryngology, Ajou University School of Medicine, Suwon 16499, Korea; (Y.J.K.); (H.K.); (J.H.J.)
| | - Yun-Hoon Choung
- Department of Otolaryngology, Ajou University School of Medicine, Suwon 16499, Korea; (Y.J.K.); (H.K.); (J.H.J.)
- Department of Medical Sciences, Ajou University Graduate School of Medicine, Suwon 16499, Korea;
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166
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Luo W, Liu Q, Chen X, Liu H, Quan B, Lu J, Zhang K, Wang X. FXYD6 Regulates Chemosensitivity by Mediating the Expression of Na+/K+-ATPase α1 and Affecting Cell Autophagy and Apoptosis in Colorectal Cancer. Biomed Res Int 2021; 2021:9986376. [PMID: 34212047 PMCID: PMC8208849 DOI: 10.1155/2021/9986376] [Citation(s) in RCA: 11] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 03/26/2021] [Accepted: 05/24/2021] [Indexed: 01/06/2023]
Abstract
PURPOSE Chemoresistance is a challenge of improving chemotherapeutic efficacy and prolonging survival time for patients with colorectal cancer (CRC); it is the major cause of frequent recurrence, rapid metastasis, and poor prognosis for CRC patients. FXYD6 is a regulator of Na+/K+-ATPase which is depressed in chemoresistant CRC patients. However, the biological roles of FXYD6 on regulating chemoresistance in CRC are still unclear. METHODS GSE3964 and GSE69657 from GEO DataSets were used to analyze the relationship of genes and chemoresistance. The FXYD6 expression level was detected by western blotting and real-time PCR and also analyzed from TCGA DataSet. To investigate the functional role of FXYD6 and ATP-α1, FXYD6 and ATP-α1 functional cell models were constructed. Drug sensitivity and cell proliferation were performed by MTT assay. Autophagy and apoptosis were conducted by autophagy fluorescence analysis and flow cytometric analysis, respectively. Autophagy and apoptosis markers were tested by western blotting. RESULTS FXYD6 was downregulated in CRC resistant patients and irinotecan- (Iri-) resistant SW620 cells (SW620/Iri). FXYD6 silence inhibited cell apoptosis and enhanced prosurvival autophagy, whereas FXYD6 overexpression produced the opposite effect which alleviated the drug resistance to irinotecan and oxaliplatin of CRC cells. FXYD6 regulates chemosensitivity by mediating the expression of Na+/K+-ATPase α1 and affecting cell autophagy and apoptosis in colorectal cancer. CONCLUSION FXYD6 functions as a chemosensitivity regulator which may predict the curative effect of chemotherapy in colorectal cancer.
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Affiliation(s)
- Wen Luo
- Department of General Surgery, Changde First People's Hospital, Changde, Hunan 415000, China
| | - Qingan Liu
- Department of General Surgery, Changde First People's Hospital, Changde, Hunan 415000, China
| | - Xinwen Chen
- Department of General Surgery, Changde First People's Hospital, Changde, Hunan 415000, China
| | - Haijun Liu
- Department of General Surgery, Changde First People's Hospital, Changde, Hunan 415000, China
| | - Bin Quan
- Department of General Surgery, Changde First People's Hospital, Changde, Hunan 415000, China
| | - Jinli Lu
- Department of General Surgery, Changde First People's Hospital, Changde, Hunan 415000, China
| | - Ke Zhang
- Department of General Surgery, Changde First People's Hospital, Changde, Hunan 415000, China
| | - Xiangling Wang
- Department of General Surgery, Changde First People's Hospital, Changde, Hunan 415000, China
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167
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Barany A, Shaughnessy CA, McCormick SD. Corticosteroid control of Na +/K +-ATPase in the intestine of the sea lamprey (Petromyzon marinus). Gen Comp Endocrinol 2021; 307:113756. [PMID: 33741310 DOI: 10.1016/j.ygcen.2021.113756] [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] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/13/2020] [Revised: 03/05/2021] [Accepted: 03/07/2021] [Indexed: 01/15/2023]
Abstract
Anadromous sea lamprey (Petromyzon marinus) larvae undergo a months-long true metamorphosis during which they develop seawater (SW) tolerance prior to downstream migration and SW entry. We have previously shown that intestinal Na+/K+-ATPase (NKA) activity increases during metamorphosis and is critical to the osmoregulatory function of the intestine in SW. The present study investigated the role of 11-deoxycortisol (S) in controlling NKA in the anterior (AI) and posterior (PI) intestine during sea lamprey metamorphosis. In a tissue profile, nka mRNA and protein were most abundant in the gill, kidney, and AI. During metamorphosis, AI nka mRNA increased 10-fold, whereas PI nka mRNA did not change. Specific corticosteroid receptors were found in the AI, which had a higher binding affinity for S compared to 11-deoxycorticosterone (DOC). In vivo administration of S in mid-metamorphic lamprey upregulated NKA activity 3-fold in the AI and PI, whereas administration of DOC did not affect intestinal NKA activity. During a 24 h SW challenge test, dehydration of white muscle moisture was rescued by prior treatment with S, which was associated with increased intestinal nka mRNA and NKA activity. These results indicate that intestinal osmoregulation in sea lamprey is a target for control by S during metamorphosis and the development of SW tolerance.
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Affiliation(s)
- Andre Barany
- Department of Biology, Faculty of Marine and Environmental Sciences, Instituto Universitario de Investigación Marina (INMAR), Campus de Excelencia Internacional del Mar (CEI·MAR), University of Cádiz, Spain; U.S. Geological Survey, Eastern Ecological Science Center, Conte Anadromous Fish Research Laboratory, US Geological Survey, Turners Falls, MA, USA.
| | - Ciaran A Shaughnessy
- Graduate Program in Organismic and Evolutionary Biology, University of Massachusetts, Amherst, MA, USA; U.S. Geological Survey, Eastern Ecological Science Center, Conte Anadromous Fish Research Laboratory, US Geological Survey, Turners Falls, MA, USA
| | - Stephen D McCormick
- U.S. Geological Survey, Eastern Ecological Science Center, Conte Anadromous Fish Research Laboratory, US Geological Survey, Turners Falls, MA, USA; Department of Biology, University of Massachusetts, Amherst, MA, USA
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Pinz MP, Vogt AG, da Costa Rodrigues K, Dos Reis AS, Duarte LFB, Fronza MG, Domingues WB, Blodorn EB, Alves D, Campos VF, Savegnago L, Wilhelm EA, Luchese C. Effect of a purine derivative containing selenium to improve memory decline and anxiety through modulation of the cholinergic system and Na +/K +-ATPase in an Alzheimer's disease model. Metab Brain Dis 2021; 36:871-888. [PMID: 33651275 DOI: 10.1007/s11011-021-00703-w] [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] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/20/2020] [Accepted: 02/22/2021] [Indexed: 02/06/2023]
Abstract
Alzheimer's disease (AD) is a worldwide problem, and there are currently no treatments that can stop this disease. To investigate the binding affinity of 6-((4-fluorophenyl) selanyl)-9H-purine (FSP) with acetylcholinesterase (AChE), to verify the effects of FSP in an AD model in mice and to evaluate the toxicological potential of this compound in mice. The binding affinity of FSP with AChE was investigated by molecular docking analyses. The AD model was induced by streptozotocin (STZ) in Swiss mice after FSP treatment (1 mg/kg, intragastrically (i.g.)), 1st-10th day of the experimental protocol. Anxiety was evaluated in an elevated plus maze test, and memory impairment was evaluated in the Y-maze, object recognition and step-down inhibitory avoidance tasks. The cholinergic system was investigated based on by looking at expression and activity of AChE and expression of choline acetyltransferase (ChAT). We evaluated expression and activity of Na+/K+-ATPase. For toxicological analysis, animals received FSP (300 mg/kg, i.g.) and aspartate aminotransferase, alanine aminotransferase activities were determined in plasma and δ-aminolevulinate dehydratase activity in brain and liver. FSP interacts with residues of the AChE active site. FSP mitigated the induction of anxiety and memory impairment caused by STZ. FSP protected cholinergic system dysfunction and reduction of activity and expression of Na+/K+-ATPase. FSP did not modify toxicological parameters evaluated and did not cause the death of mice. FSP protected against anxiety, learning and memory impairment with involvement of the cholinergic system and Na+/K+-ATPase in these actions.
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Affiliation(s)
- Mikaela Peglow Pinz
- Programa de Pós-graduação em Bioquímica e Bioprospecção, Laboratório de Pesquisa em Farmacologia Bioquímica (LaFarBio), Grupo de Pesquisa em Neurobiotecnologia (GPN), Centro de Ciências Químicas, Farmacêuticas e de Alimentos (CCQFA), Universidade Federal de Pelotas (UFPel), Campus Capão do Leão, Pelotas, RS, CEP96010-900, Brazil
| | - Ane Gabriela Vogt
- Programa de Pós-graduação em Bioquímica e Bioprospecção, Laboratório de Pesquisa em Farmacologia Bioquímica (LaFarBio), Grupo de Pesquisa em Neurobiotecnologia (GPN), Centro de Ciências Químicas, Farmacêuticas e de Alimentos (CCQFA), Universidade Federal de Pelotas (UFPel), Campus Capão do Leão, Pelotas, RS, CEP96010-900, Brazil
| | - Karline da Costa Rodrigues
- Programa de Pós-graduação em Bioquímica e Bioprospecção, Laboratório de Pesquisa em Farmacologia Bioquímica (LaFarBio), Grupo de Pesquisa em Neurobiotecnologia (GPN), Centro de Ciências Químicas, Farmacêuticas e de Alimentos (CCQFA), Universidade Federal de Pelotas (UFPel), Campus Capão do Leão, Pelotas, RS, CEP96010-900, Brazil
| | - Angélica Schiavom Dos Reis
- Programa de Pós-graduação em Bioquímica e Bioprospecção, Laboratório de Pesquisa em Farmacologia Bioquímica (LaFarBio), Grupo de Pesquisa em Neurobiotecnologia (GPN), Centro de Ciências Químicas, Farmacêuticas e de Alimentos (CCQFA), Universidade Federal de Pelotas (UFPel), Campus Capão do Leão, Pelotas, RS, CEP96010-900, Brazil
| | - Luis Fernando Barbosa Duarte
- Programa de Pós-Graduação em Química, Laboratório de Síntese Orgânica Limpa (LASOL), CCQFA, UFPel, Pelotas, RS, CEP 96010-900, Brazil
| | - Mariana Gallio Fronza
- Programa de Pós-Graduação em Biotecnologia, GPN, CDTec, UFPel, Pelotas, RS, CEP 96010-900, Brazil
| | - William Borges Domingues
- Programa de Pós-Graduação em Biotecnologia, Laboratório de Genômica Estrutural, Centro de Desenvolvimento Tecnológico (CDTec), UFPel, Pelotas, RS, CEP 96010-900, Brazil
| | - Eduardo Bierhaus Blodorn
- Programa de Pós-Graduação em Biotecnologia, Laboratório de Genômica Estrutural, Centro de Desenvolvimento Tecnológico (CDTec), UFPel, Pelotas, RS, CEP 96010-900, Brazil
| | - Diego Alves
- Programa de Pós-Graduação em Química, Laboratório de Síntese Orgânica Limpa (LASOL), CCQFA, UFPel, Pelotas, RS, CEP 96010-900, Brazil
| | - Vinicius Farias Campos
- Programa de Pós-Graduação em Biotecnologia, Laboratório de Genômica Estrutural, Centro de Desenvolvimento Tecnológico (CDTec), UFPel, Pelotas, RS, CEP 96010-900, Brazil
| | - Lucielli Savegnago
- Programa de Pós-Graduação em Biotecnologia, GPN, CDTec, UFPel, Pelotas, RS, CEP 96010-900, Brazil
| | - Ethel Antunes Wilhelm
- Programa de Pós-graduação em Bioquímica e Bioprospecção, Laboratório de Pesquisa em Farmacologia Bioquímica (LaFarBio), Grupo de Pesquisa em Neurobiotecnologia (GPN), Centro de Ciências Químicas, Farmacêuticas e de Alimentos (CCQFA), Universidade Federal de Pelotas (UFPel), Campus Capão do Leão, Pelotas, RS, CEP96010-900, Brazil.
| | - Cristiane Luchese
- Programa de Pós-graduação em Bioquímica e Bioprospecção, Laboratório de Pesquisa em Farmacologia Bioquímica (LaFarBio), Grupo de Pesquisa em Neurobiotecnologia (GPN), Centro de Ciências Químicas, Farmacêuticas e de Alimentos (CCQFA), Universidade Federal de Pelotas (UFPel), Campus Capão do Leão, Pelotas, RS, CEP96010-900, Brazil.
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Khadrawy YA, Hosny EN, El-Gizawy MM, Sawie HG, Aboul Ezz HS. The Effect of Curcumin Nanoparticles on Cisplatin-Induced Cardiotoxicity in Male Wistar Albino Rats. Cardiovasc Toxicol 2021; 21:433-443. [PMID: 33548025 DOI: 10.1007/s12012-021-09636-3] [Citation(s) in RCA: 10] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/10/2020] [Accepted: 01/25/2021] [Indexed: 01/06/2023]
Abstract
The cardiotoxicity of chemotherapeutic drugs as cisplatin has become a major issue in recent years. The present study investigates the efficacy of curcumin nanoparticles against the cardiotoxic effects of cisplatin by assessment of oxidative stress parameters, Na+,K+-ATPase, acetylcholinesterase (AchE) and tumor necrosis factor-alpha (TNF-α) in cardiac tissue in addition to serum lactate dehydrogenase (LDH). Rats were divided into three groups: control rats that received saline for 14 days; cisplatin-treated rats that received a single intraperitoneal (i.p.) injection of cisplatin (12 mg/kg) followed by a daily oral administration of saline (0.9%) for 14 days and rats treated with a single i.p. injection of cisplatin (12 mg/kg) followed by a daily oral administration of curcumin nanoparticles (50 mg/kg) for 14 days. Cisplatin resulted in a significant increase in lipid peroxidation, nitric oxide (NO), and TNF-α and a significant decrease in reduced glutathione (GSH) levels and Na+, K+- ATPase activity. Moreover, significant increases in cardiac AchE and serum lactate dehydrogenase activities were recorded. Treatment of cisplatin-injected animals with curcumin nanoparticles ameliorated all the alterations induced by cisplatin in the heart of rats. This suggests that curcumin nanoparticles can be used as an important therapeutic adjuvant in chemotherapeutic and other toxicities mediated by oxidative stress and inflammation.
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Affiliation(s)
- Yasser A Khadrawy
- Medical Physiology Department, Medical Division, National Research Centre, El-Behouth St., Giza, Egypt.
| | - Eman N Hosny
- Medical Physiology Department, Medical Division, National Research Centre, El-Behouth St., Giza, Egypt
| | - Mayada M El-Gizawy
- Medical Physiology Department, Medical Division, National Research Centre, El-Behouth St., Giza, Egypt
| | - Hussein G Sawie
- Medical Physiology Department, Medical Division, National Research Centre, El-Behouth St., Giza, Egypt
| | - Heba S Aboul Ezz
- Zoology Department, Faculty of Science, Cairo University, Giza, Egypt
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170
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Vargas-Chacoff L, Dann F, Paschke K, Oyarzún-Salazar R, Nualart D, Martínez D, Wilson JM, Guerreiro PM, Navarro JM. Freshening effect on the osmotic response of the Antarctic spiny plunderfish Harpagifer antarcticus. J Fish Biol 2021; 98:1558-1571. [PMID: 33452810 DOI: 10.1111/jfb.14676] [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] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/16/2020] [Revised: 01/05/2021] [Accepted: 01/14/2021] [Indexed: 06/12/2023]
Abstract
Global warming is having a significant impact around the world, modifying environmental conditions in many areas, including in zones that have been thermally stable for thousands of years, such as Antarctica. Stenothermal sedentary intertidal fish species may suffer due to warming, notably if this causes water freshening from increased freshwater inputs. Acute decreases in salinity, from 33 down to 5, were used to assess osmotic responses to environmental salinity fluctuations in Antarctic spiny plunderfish Harpagifer antarcticus, in particular to evaluate if H. antarcticus is able to cope with freshening and to describe osmoregulatory responses at different levels (haematological variables, muscle water content, gene expression, NKA activity). H. antarcticus were acclimated to a range of salinities (33 as control, 20, 15, 10 and 5) for 1 week. At 5, plasma osmolality and calcium concentration were both at their lowest, while plasma cortisol and percentage muscle water content were at their highest. At the same salinity, gill and intestine Na+ -K+ -ATPase (NKA) activities were at their lowest and highest, respectively. In kidney, NKA activity was highest at intermediate salinities (15 and 10). The salinity-dependent NKA mRNA expression patterns differed depending on the tissue. Marked changes were also observed in the expression of genes coding membrane proteins associated with ion and water transport, such as NKCC2, CFTR and AQP8, and in the expression of mRNA for the regulatory hormone prolactin (PRL) and its receptor (PRLr). Our results demonstrate that freshening causes osmotic imbalances in H. antarcticus, apparently due to reduced capacity of both transport and regulatory mechanisms of key organs to maintain homeostasis. This has implications for fish species that have evolved in stable environmental conditions in the Antarctic, now threatened by climate change.
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Affiliation(s)
- Luis Vargas-Chacoff
- Instituto de Ciencias Marinas y Limnológicas, Universidad Austral de Chile, Valdivia, Chile
- Centro Fondap de Investigación de Altas Latitudes, Universidad Austral de Chile, Valdivia, Chile
| | - Francisco Dann
- Instituto de Ciencias Marinas y Limnológicas, Universidad Austral de Chile, Valdivia, Chile
- Centro Fondap de Investigación de Altas Latitudes, Universidad Austral de Chile, Valdivia, Chile
| | - Kurt Paschke
- Centro Fondap de Investigación de Altas Latitudes, Universidad Austral de Chile, Valdivia, Chile
- Instituto de Acuicultura, Universidad Austral de Chile, Puerto Montt, Chile
| | - Ricardo Oyarzún-Salazar
- Instituto de Ciencias Marinas y Limnológicas, Universidad Austral de Chile, Valdivia, Chile
- Centro Fondap de Investigación de Altas Latitudes, Universidad Austral de Chile, Valdivia, Chile
- Escuela de Graduados Programa de Doctorado en Ciencias de la Acuicultura, Universidad Austral de Chile, Puerto Montt, Chile
| | - Daniela Nualart
- Instituto de Ciencias Marinas y Limnológicas, Universidad Austral de Chile, Valdivia, Chile
| | - Danixa Martínez
- Instituto de Ciencias Marinas y Limnológicas, Universidad Austral de Chile, Valdivia, Chile
| | - Jonathan M Wilson
- Wilfrid Laurier University, Waterloo, Ontario, Canada
- Centro Interdisciplinar de Investigação Marinha e Ambiental, Matosinhos, Portugal
| | | | - Jorge M Navarro
- Instituto de Ciencias Marinas y Limnológicas, Universidad Austral de Chile, Valdivia, Chile
- Centro Fondap de Investigación de Altas Latitudes, Universidad Austral de Chile, Valdivia, Chile
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171
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da Silva DS, Soares MSP, Teixeira FC, de Mello JE, de Souza AA, Luduvico KP, de Andrade CM, Spanevello RM, Cunico W. Multitarget Effect of 2-(4-(Methylthio)phenyl)-3-(3-(piperidin-1-yl)propyl)thiazolidin-4-one in a Scopolamine-Induced Amnesic Rat Model. Neurochem Res 2021; 46:1554-1566. [PMID: 33755857 DOI: 10.1007/s11064-021-03295-0] [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] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/11/2020] [Revised: 02/25/2021] [Accepted: 03/02/2021] [Indexed: 01/24/2023]
Abstract
Cholinergic system dysfunction, oxidative damage, and alterations in ion pump activity have been associated with memory loss and cognitive deficits in Alzheimer's disease. 1,3-thiazolidin-4-ones have emerged as a class of compounds with potential therapeutic effects due to their potent anticholinesterase activity. Accordingly, this study investigated the effect of the 2-(4-(methylthio)phenyl)-3-(3-(piperidin-1-yl)propyl)thiazolidin-4-one (DS12) compound on memory, cholinergic and oxidative stress parameters, ion pump activity, and serum biochemical markers in a scopolamine-induced memory deficit model. Male Wistar rats were divided into four groups: I-Control; II-Scopolamine; III-DS12 (5 mg/kg) + scopolamine; and IV-DS12 (10 mg/kg) + scopolamine. The animals from groups III and IV received DS12 diluted in canola oil and administered for 7 days by gavage. On the last day of treatment, scopolamine (1 mg/kg) was administered intraperitoneally (i.p.) 30 min after training in an inhibitory avoidance apparatus. Twenty-four hours after scopolamine administration, the animals were subjected to an inhibitory avoidance test and were thereafter euthanized. Scopolamine induced memory deficits, increased acetylcholinesterase activity and oxidative damage, and decreased Na+/K+-ATPase activity in cerebral cortex and hippocampus. Pretreatment with DS12 prevented these brain alterations. Scopolamine also induced an increase in acetylcholinesterase activity in lymphocytes and whereas butyrylcholinesterase in serum and treatment with DS12 prevented these changes. In animals treated with DS12, no changes were observed in renal and hepatic parameters when compared to the control group. In conclusion, DS12 emerged as an important multitarget compound capable of preventing neurochemical changes associated with memory deficits.
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Affiliation(s)
- Daniel Schuch da Silva
- Laboratório de Química Aplicada a Bioativos, Centro Ciências Químicas, Farmacêuticas e de Alimentos, Universidade Federal de Pelotas, Pelotas, RS, Brasil
| | - Mayara Sandrielly Pereira Soares
- Laboratório de Neuroquímica, Inflamação e Câncer, Centro de Ciências Químicas Farmacêuticas e de Alimentos, Universidade Federal de Pelotas, Campus Universitário s/n, Capão do Leão, RS, CEP 96010-900, Brazil
| | - Fernanda Cardoso Teixeira
- Laboratório de Neuroquímica, Inflamação e Câncer, Centro de Ciências Químicas Farmacêuticas e de Alimentos, Universidade Federal de Pelotas, Campus Universitário s/n, Capão do Leão, RS, CEP 96010-900, Brazil
| | - Júlia Eisenhardt de Mello
- Laboratório de Neuroquímica, Inflamação e Câncer, Centro de Ciências Químicas Farmacêuticas e de Alimentos, Universidade Federal de Pelotas, Campus Universitário s/n, Capão do Leão, RS, CEP 96010-900, Brazil
| | - Anita Avila de Souza
- Laboratório de Neuroquímica, Inflamação e Câncer, Centro de Ciências Químicas Farmacêuticas e de Alimentos, Universidade Federal de Pelotas, Campus Universitário s/n, Capão do Leão, RS, CEP 96010-900, Brazil
| | - Karina Pereira Luduvico
- Laboratório de Neuroquímica, Inflamação e Câncer, Centro de Ciências Químicas Farmacêuticas e de Alimentos, Universidade Federal de Pelotas, Campus Universitário s/n, Capão do Leão, RS, CEP 96010-900, Brazil
| | - Cinthia Melazzo de Andrade
- Departamento de Clínica de Pequenos Animais, Laboratório de Análises Clínicas Veterinário, Hospital Veterinário, Universidade Federal de Santa Maria, Santa Maria, RS, Brasil
| | - Roselia Maria Spanevello
- Laboratório de Neuroquímica, Inflamação e Câncer, Centro de Ciências Químicas Farmacêuticas e de Alimentos, Universidade Federal de Pelotas, Campus Universitário s/n, Capão do Leão, RS, CEP 96010-900, Brazil.
| | - Wilson Cunico
- Laboratório de Química Aplicada a Bioativos, Centro Ciências Químicas, Farmacêuticas e de Alimentos, Universidade Federal de Pelotas, Pelotas, RS, Brasil.
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172
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Contreras SA, Schleimer JH, Gulledge AT, Schreiber S. Activity-mediated accumulation of potassium induces a switch in firing pattern and neuronal excitability type. PLoS Comput Biol 2021; 17:e1008510. [PMID: 34043638 PMCID: PMC8205125 DOI: 10.1371/journal.pcbi.1008510] [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] [MESH Headings] [Grants] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/06/2020] [Revised: 06/15/2021] [Accepted: 04/16/2021] [Indexed: 01/30/2023] Open
Abstract
During normal neuronal activity, ionic concentration gradients across a neuron’s membrane are often assumed to be stable. Prolonged spiking activity, however, can reduce transmembrane gradients and affect voltage dynamics. Based on mathematical modeling, we investigated the impact of neuronal activity on ionic concentrations and, consequently, the dynamics of action potential generation. We find that intense spiking activity on the order of a second suffices to induce changes in ionic reversal potentials and to consistently induce a switch from a regular to an intermittent firing mode. This transition is caused by a qualitative alteration in the system’s voltage dynamics, mathematically corresponding to a co-dimension-two bifurcation from a saddle-node on invariant cycle (SNIC) to a homoclinic orbit bifurcation (HOM). Our electrophysiological recordings in mouse cortical pyramidal neurons confirm the changes in action potential dynamics predicted by the models: (i) activity-dependent increases in intracellular sodium concentration directly reduce action potential amplitudes, an effect typically attributed solely to sodium channel inactivation; (ii) extracellular potassium accumulation switches action potential generation from tonic firing to intermittently interrupted output. Thus, individual neurons may respond very differently to the same input stimuli, depending on their recent patterns of activity and/or the current brain-state. Ionic concentrations in the brain are not constant. We show that during intense neuronal activity, they can change on the order of seconds and even switch neuronal spiking patterns under identical stimulation from a regular firing mode to an intermittently interrupted one. Triggered by an accumulation of extracellular potassium, such a transition is caused by a specific, qualitative change in of the neuronal voltage dynamics—a so-called bifurcation—which affects crucial features of action-potential generation and bears consequences for how information is encoded and how neurons behave together in the network. Also, changes in intracellular sodium can induce measurable effects, like a reduction of spike amplitude that occurs independently of the fast amplitude effects attributed to sodium channel inactivation. Taken together, our results demonstrate that a neuron can respond very differently to the same stimulus, depending on its previous activity or the current brain state. This finding may be particularly relevant when other regulatory mechanisms of ionic homeostasis are challenged, for example, during pathological states of glial impairment or oxygen deprivation. Finally, categorization of cortical neurons as intrinsically bursting or regular spiking may be biased by the ionic concentrations at the time of the observation, highlighting the non-static nature of neuronal dynamics.
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Affiliation(s)
- Susana Andrea Contreras
- Institute for Theoretical Biology, Humboldt-University of Berlin, Berlin, Germany
- Bernstein Center for Computational Neuroscience Berlin, Berlin, Germany
| | - Jan-Hendrik Schleimer
- Institute for Theoretical Biology, Humboldt-University of Berlin, Berlin, Germany
- Bernstein Center for Computational Neuroscience Berlin, Berlin, Germany
| | - Allan T. Gulledge
- Molecular and Systems Biology, Geisel School of Medicine at Dartmouth College, Hanover, New Hampshire, United States of America
| | - Susanne Schreiber
- Institute for Theoretical Biology, Humboldt-University of Berlin, Berlin, Germany
- Bernstein Center for Computational Neuroscience Berlin, Berlin, Germany
- * E-mail:
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173
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Morotti S, Ni H, Peters CH, Rickert C, Asgari-Targhi A, Sato D, Glukhov AV, Proenza C, Grandi E. Intracellular Na + Modulates Pacemaking Activity in Murine Sinoatrial Node Myocytes: An In Silico Analysis. Int J Mol Sci 2021; 22:5645. [PMID: 34073281 PMCID: PMC8198068 DOI: 10.3390/ijms22115645] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [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: 04/19/2021] [Revised: 05/21/2021] [Accepted: 05/25/2021] [Indexed: 12/19/2022] Open
Abstract
Background: The mechanisms underlying dysfunction in the sinoatrial node (SAN), the heart's primary pacemaker, are incompletely understood. Electrical and Ca2+-handling remodeling have been implicated in SAN dysfunction associated with heart failure, aging, and diabetes. Cardiomyocyte [Na+]i is also elevated in these diseases, where it contributes to arrhythmogenesis. Here, we sought to investigate the largely unexplored role of Na+ homeostasis in SAN pacemaking and test whether [Na+]i dysregulation may contribute to SAN dysfunction. Methods: We developed a dataset-specific computational model of the murine SAN myocyte and simulated alterations in the major processes of Na+ entry (Na+/Ca2+ exchanger, NCX) and removal (Na+/K+ ATPase, NKA). Results: We found that changes in intracellular Na+ homeostatic processes dynamically regulate SAN electrophysiology. Mild reductions in NKA and NCX function increase myocyte firing rate, whereas a stronger reduction causes bursting activity and loss of automaticity. These pathologic phenotypes mimic those observed experimentally in NCX- and ankyrin-B-deficient mice due to altered feedback between the Ca2+ and membrane potential clocks underlying SAN firing. Conclusions: Our study generates new testable predictions and insight linking Na+ homeostasis to Ca2+ handling and membrane potential dynamics in SAN myocytes that may advance our understanding of SAN (dys)function.
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Affiliation(s)
- Stefano Morotti
- Department of Pharmacology, University of California Davis, Davis, CA 95616, USA; (H.N.); (A.A.-T.); (D.S.)
| | - Haibo Ni
- Department of Pharmacology, University of California Davis, Davis, CA 95616, USA; (H.N.); (A.A.-T.); (D.S.)
| | - Colin H. Peters
- Department of Physiology and Biophysics, University of Colorado Anschutz Medical Campus, Aurora, CO 80045, USA; (C.H.P.); (C.R.); (C.P.)
| | - Christian Rickert
- Department of Physiology and Biophysics, University of Colorado Anschutz Medical Campus, Aurora, CO 80045, USA; (C.H.P.); (C.R.); (C.P.)
| | - Ameneh Asgari-Targhi
- Department of Pharmacology, University of California Davis, Davis, CA 95616, USA; (H.N.); (A.A.-T.); (D.S.)
| | - Daisuke Sato
- Department of Pharmacology, University of California Davis, Davis, CA 95616, USA; (H.N.); (A.A.-T.); (D.S.)
| | - Alexey V. Glukhov
- Department of Medicine, Cardiovascular Medicine, University of Wisconsin Madison School of Medicine and Public Health, Madison, WI 53705, USA;
| | - Catherine Proenza
- Department of Physiology and Biophysics, University of Colorado Anschutz Medical Campus, Aurora, CO 80045, USA; (C.H.P.); (C.R.); (C.P.)
- Department of Medicine, Division of Cardiology, University of Colorado Anschutz Medical Campus, Aurora, CO 80045, USA
| | - Eleonora Grandi
- Department of Pharmacology, University of California Davis, Davis, CA 95616, USA; (H.N.); (A.A.-T.); (D.S.)
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174
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Liu Y, Chu S, Hu Y, Yang S, Li X, Zheng Q, Ai Q, Ren S, Wang H, Gong L, Xu X, Chen NH. Exogenous Adenosine Antagonizes Excitatory Amino Acid Toxicity in Primary Astrocytes. Cell Mol Neurobiol 2021; 41:687-704. [PMID: 32632892 DOI: 10.1007/s10571-020-00876-5] [Citation(s) in RCA: 9] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/18/2019] [Accepted: 05/12/2020] [Indexed: 12/29/2022]
Abstract
Excitatory toxicity is still a hot topic in the study of ischemic stroke, and related research has focused mainly on neurons. Adenosine is an important neuromodulator that is known as a "biosignature" in the central nervous system (CNS). The protective effect of exogenous adenosine on neurons has been confirmed, but its mechanism remains elusive. In this study, astrocytes were pretreated with adenosine, and the effects of an A2a receptor (A2aR) inhibitor (SCH58261) and A2b receptor (A2bR) inhibitor (PSB1115) on excitatory glutamate were investigated. An oxygen glucose deprivation/reoxygenation (OGD/R) and glutamate model was generated in vitro. Post-model assessment included expression levels of glutamate transporters (glt-1), gap junction protein (Cx43) and glutamate receptor (AMPAR), Na+-K+-ATPase activity, and diffusion distance of dyes. Glutamate and glutamine contents were determined at different time points. The results showed that (1) adenosine could improve the function of Na+-K+-ATPase, upregulate the expression of glt-1, and enhance the synthesis of glutamine in astrocytes. This effect was associated with A2aR activation but not with A2bR activation. (2) Adenosine could inhibit the expression of gap junction protein (Cx43) and reduce glutamate diffusion. Inhibition of A2aR attenuated adenosine inhibition of gap junction intercellular communication (GJIC) in the OGD/R model, while it enhanced adenosine inhibition of GJIC in the glutamate model, depending on the glutamate concentration. (3) Adenosine could cause AMPAR gradually entered the nucleus from the cytoplasm, thereby reducing the expression of AMPAR on the cell membrane. Taken together, the results indicate that adenosine plays a role of anti-excitatory toxicity effect in protection against neuronal death and the functional recovery of ischemic stroke mainly by targeting astrocytes, which are closely related to A2aR. The present study provided a scientific basis for adenosine prevention and ischemic stroke treatment, thereby providing a new approach for alleviating ischemic stroke.
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Affiliation(s)
- Yingjiao Liu
- College of Pharmacy, Hunan University of Chinese Medicine & Hunan Engineering Technology Center of Standardization and Function of Chinese Herbal Decoction Pieces, Changsha, 410208, China
- State Key Laboratory of Bioactive Substances and Functions of Natural Medicines, Institute of Materia Medica & Neuroscience Center, Chinese Academy of Medical Sciences and Peking Union Medical College, Beijing, 100050, China
| | - Shifeng Chu
- State Key Laboratory of Bioactive Substances and Functions of Natural Medicines, Institute of Materia Medica & Neuroscience Center, Chinese Academy of Medical Sciences and Peking Union Medical College, Beijing, 100050, China
| | - Yaomei Hu
- College of Pharmacy, Hunan University of Chinese Medicine & Hunan Engineering Technology Center of Standardization and Function of Chinese Herbal Decoction Pieces, Changsha, 410208, China
| | - Songwei Yang
- College of Pharmacy, Hunan University of Chinese Medicine & Hunan Engineering Technology Center of Standardization and Function of Chinese Herbal Decoction Pieces, Changsha, 410208, China
| | - Xun Li
- College of Pharmacy, Hunan University of Chinese Medicine & Hunan Engineering Technology Center of Standardization and Function of Chinese Herbal Decoction Pieces, Changsha, 410208, China
- State Key Laboratory of Bioactive Substances and Functions of Natural Medicines, Institute of Materia Medica & Neuroscience Center, Chinese Academy of Medical Sciences and Peking Union Medical College, Beijing, 100050, China
| | - Qinglian Zheng
- Institute for Brain Research and Rehabilitation, South China Normal University, Guangzhou, 510631, China
| | - Qidi Ai
- College of Pharmacy, Hunan University of Chinese Medicine & Hunan Engineering Technology Center of Standardization and Function of Chinese Herbal Decoction Pieces, Changsha, 410208, China
| | - Siyu Ren
- College of Pharmacy, Hunan University of Chinese Medicine & Hunan Engineering Technology Center of Standardization and Function of Chinese Herbal Decoction Pieces, Changsha, 410208, China
| | - Huiqin Wang
- College of Pharmacy, Hunan University of Chinese Medicine & Hunan Engineering Technology Center of Standardization and Function of Chinese Herbal Decoction Pieces, Changsha, 410208, China
| | - Limin Gong
- College of Pharmacy, Hunan University of Chinese Medicine & Hunan Engineering Technology Center of Standardization and Function of Chinese Herbal Decoction Pieces, Changsha, 410208, China
| | - Xin Xu
- Institute for Brain Research and Rehabilitation, South China Normal University, Guangzhou, 510631, China
| | - Nai-Hong Chen
- College of Pharmacy, Hunan University of Chinese Medicine & Hunan Engineering Technology Center of Standardization and Function of Chinese Herbal Decoction Pieces, Changsha, 410208, China.
- State Key Laboratory of Bioactive Substances and Functions of Natural Medicines, Institute of Materia Medica & Neuroscience Center, Chinese Academy of Medical Sciences and Peking Union Medical College, Beijing, 100050, China.
- Institute for Brain Research and Rehabilitation, South China Normal University, Guangzhou, 510631, China.
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175
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Škubník J, Pavlíčková V, Rimpelová S. Cardiac Glycosides as Immune System Modulators. Biomolecules 2021; 11:biom11050659. [PMID: 33947098 PMCID: PMC8146282 DOI: 10.3390/biom11050659] [Citation(s) in RCA: 18] [Impact Index Per Article: 6.0] [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: 03/31/2021] [Revised: 04/26/2021] [Accepted: 04/27/2021] [Indexed: 12/11/2022] Open
Abstract
Cardiac glycosides (CGs) are natural steroid compounds occurring both in plants and animals. They are known for long as cardiotonic agents commonly used for various cardiac diseases due to inhibition of Na+/K+-ATPase (NKA) pumping activity and modulating heart muscle contractility. However, recent studies show that the portfolio of diseases potentially treatable with CGs is much broader. Currently, CGs are mostly studied as anticancer agents. Their antiproliferative properties are based on the induction of multiple signaling pathways in an NKA signalosome complex. In addition, they are strongly connected to immunogenic cell death, a complex mechanism of induction of anticancer immune response. Moreover, CGs exert various immunomodulatory effects, the foremost of which are connected with suppressing the activity of T-helper cells or modulating transcription of many immune response genes by inhibiting nuclear factor kappa B. The resulting modulations of cytokine and chemokine levels and changes in immune cell ratios could be potentially useful in treating sundry autoimmune and inflammatory diseases. This review aims to summarize current knowledge in the field of immunomodulatory properties of CGs and emphasize the large area of potential clinical use of these compounds.
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176
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Kinaneh S, Knany Y, Khoury EE, Ismael-Badarneh R, Hamoud S, Berger G, Abassi Z, Azzam ZS. Identification, localization and expression of NHE isoforms in the alveolar epithelial cells. PLoS One 2021; 16:e0239240. [PMID: 33882062 PMCID: PMC8059851 DOI: 10.1371/journal.pone.0239240] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/24/2020] [Accepted: 04/02/2021] [Indexed: 02/06/2023] Open
Abstract
Na+/H+ exchangers (NHEs), encoded by Solute Carrier 9A (SLC9A) genes in human, are ubiquitous integral membrane ion transporters that mediate the electroneutral exchange of H+ with Na+ or K+. NHEs, found in the kidney and intestine, play a major role in the process of fluid reabsorption together via Na+,K+-ATPase pump and Na+ channels. Nevertheless, the expression pattern of NHE in the lung and its role in alveolar fluid homeostasis has not been addressed. Therefore, we aimed to examine the expression of NHE specific isoforms in alveolar epithelial cells (AECs), and assess their role in congestive heart failure (CHF). Three NHE isoforms were identified in AEC and A549 cell line, at the level of protein and mRNA; NHE1, NHE2 and mainly NHE8, the latter was shown to be localized in the apical membrane of AEC. Treating A549 cells with angiotensin (Ang) II for 3, 5 and 24 hours displayed a significant reduction in NHE8 protein abundance. Moreover, the abundance of NHE8 protein was downregulated in A549 cells that were treated overnight with Ang II. NHE8 abundance in whole lung lysate was increased in rats with 1-week CHF compared to sham operated rats. However, lower abundance of NHE8 was observed in 4-week CHF group. In conclusion, we herein show for the first time, the expression of a novel NHE isoform in AEC, namely NHE8. Notably, Ang II decreased NHE8 protein levels. Moreover, NHE8 was distinctly affected in CHF rats, probably depending on the severity of the heart failure.
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Affiliation(s)
- Safa Kinaneh
- Ruth & Bruce Rappaport Faculty of Medicine, Department of Physiology, Technion, Israel Institute of Technology, Haifa, Israel
| | - Yara Knany
- Ruth & Bruce Rappaport Faculty of Medicine, Department of Physiology, Technion, Israel Institute of Technology, Haifa, Israel
| | - Emad E. Khoury
- Ruth & Bruce Rappaport Faculty of Medicine, Department of Physiology, Technion, Israel Institute of Technology, Haifa, Israel
| | | | - Shadi Hamoud
- Ruth & Bruce Rappaport Faculty of Medicine, Department of Physiology, Technion, Israel Institute of Technology, Haifa, Israel
- Internal Medicine “E”, Rambam: Human Health Care Campus, Haifa, Israel
| | - Gidon Berger
- Ruth & Bruce Rappaport Faculty of Medicine, Department of Physiology, Technion, Israel Institute of Technology, Haifa, Israel
- Internal Medicine “B”, Rambam: Human Health Care Campus, Haifa, Israel
| | - Zaid Abassi
- Ruth & Bruce Rappaport Faculty of Medicine, Department of Physiology, Technion, Israel Institute of Technology, Haifa, Israel
| | - Zaher S. Azzam
- Ruth & Bruce Rappaport Faculty of Medicine, Department of Physiology, Technion, Israel Institute of Technology, Haifa, Israel
- Internal Medicine “B”, Rambam: Human Health Care Campus, Haifa, Israel
- * E-mail:
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Sharashenidze T, Shvelidze K, Tsimakuridze M, Turabelidze-Robaqidze S, Buleishvili M, Sanikidze T. ROLE OF Β-ADRENOCEPTORS IN REGULATION OF ERYTHROCYTES' RHEOLOGICAL FUNCTIONS (REVIEW). Georgian Med News 2021:173-176. [PMID: 34103452] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 06/12/2023]
Abstract
In this review, we discuss the role of adrenoceptors in the regulation of the rheological functions of erythrocytes. β-adrenoceptors play an important role in the regulation of erythrocytes functions and metabolism. They participate in the modification of transport membrane proteins (Na+/K+-ATPase, Ca+2-ATPase, Na+/K+/2Cl-cotransporter, Na+/H+-antiporter, CAT-1, Ca2+-dependent K+ channels (Gard channels), the activity of adenylate cyclase and cAMP, AMP-dependent activation of the L-arginine/NOS system and erythrocyte NOS) and by this way modulate the cells volume, rheological properties (deformability, aggregability), intensity of NO synthesis and ATP reliase. These properties of erythrocytes determine, that, in addition to the transport of gases, they play the oxygen sensors role and can participate in the mechanisms of vasorelaxation and maintenance of a normal level of microcirculation.
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178
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Nepal N, Arthur S, Haynes J, Palaniappan B, Sundaram U. Mechanism of Na-K-ATPase Inhibition by PGE2 in Intestinal Epithelial Cells. Cells 2021; 10:cells10040752. [PMID: 33805551 PMCID: PMC8066871 DOI: 10.3390/cells10040752] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [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: 03/04/2021] [Revised: 03/23/2021] [Accepted: 03/26/2021] [Indexed: 11/26/2022] Open
Abstract
The primary means of intestinal absorption of nutrients by villus cells is via Na-dependent nutrient co-transporters located in the brush border membrane (BBM). These secondary active co-transport processes require a favorable transcellular Na gradient that is provided by Na-K-ATPase. In chronic enteritis, malabsorption of essential nutrients is partially due to inhibition of villus Na-K-ATPase activity mediated by specific immune inflammatory mediators that are known to be elevated in the inflamed mucosa. However, how Prostaglandin E2 (PGE2), a specific mediator of nutrient malabsorption in the villus BBM, may mediate the inhibition of Na-K-ATPase is not known. Therefore, this study aimed to determine the effect of PGE2 on Na-K-ATPase in villus cells and define its mechanism of action. In vitro, in IEC-18 cells, PGE2 treatment significantly reduced Na-K-ATPase activity, accompanied by a significant increase in the intracellular levels of cyclic Adenosine Monophosphate (cAMP). The treatment with cAMP analog 8-Bromo-cAMP mimicked the PGE2-mediated effect on Na-K-ATPase activity, while Rp-cAMP (PKA inhibitor) pretreatment reversed the same. The mechanism of inhibition of PGE2 was secondary to a transcriptional reduction in the Na-K-ATPase α1 and β1 subunit genes, which was reversed by the Rp-cAMP pretreatment. Thus, the PGE2-mediated activation of the PKA pathway mediates the transcriptional inhibition of Na-K-ATPase activity in vitro.
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179
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Bejček J, Spiwok V, Kmoníčková E, Rimpelová S. Na +/K +-ATPase Revisited: On Its Mechanism of Action, Role in Cancer, and Activity Modulation. Molecules 2021; 26:molecules26071905. [PMID: 33800655 PMCID: PMC8061769 DOI: 10.3390/molecules26071905] [Citation(s) in RCA: 35] [Impact Index Per Article: 11.7] [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: 02/08/2021] [Revised: 03/18/2021] [Accepted: 03/24/2021] [Indexed: 01/08/2023] Open
Abstract
Maintenance of Na+ and K+ gradients across the cell plasma membrane is an essential process for mammalian cell survival. An enzyme responsible for this process, sodium-potassium ATPase (NKA), has been currently extensively studied as a potential anticancer target, especially in lung cancer and glioblastoma. To date, many NKA inhibitors, mainly of natural origin from the family of cardiac steroids (CSs), have been reported and extensively studied. Interestingly, upon CS binding to NKA at nontoxic doses, the role of NKA as a receptor is activated and intracellular signaling is triggered, upon which cancer cell death occurs, which lies in the expression of different NKA isoforms than in healthy cells. Two major CSs, digoxin and digitoxin, originally used for the treatment of cardiac arrhythmias, are also being tested for another indication—cancer. Such drug repositioning has a big advantage in smoother approval processes. Besides this, novel CS derivatives with improved performance are being developed and evaluated in combination therapy. This article deals with the NKA structure, mechanism of action, activity modulation, and its most important inhibitors, some of which could serve not only as a powerful tool to combat cancer, but also help to decipher the so-far poorly understood NKA regulation.
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Affiliation(s)
- Jiří Bejček
- Department of Biochemistry and Microbiology, University of Chemistry and Technology Prague, Technická 3, 166 28 Prague 6, Czech Republic; (J.B.); (V.S.)
| | - Vojtěch Spiwok
- Department of Biochemistry and Microbiology, University of Chemistry and Technology Prague, Technická 3, 166 28 Prague 6, Czech Republic; (J.B.); (V.S.)
| | - Eva Kmoníčková
- Department of Pharmacology, Second Faculty of Medicine, Charles University, Plzeňská 311, 150 00 Prague, Czech Republic;
| | - Silvie Rimpelová
- Department of Biochemistry and Microbiology, University of Chemistry and Technology Prague, Technická 3, 166 28 Prague 6, Czech Republic; (J.B.); (V.S.)
- Faculty of Medicine in Pilsen, Charles University, Alej Svobody 76, 323 00 Pilsen, Czech Republic
- Correspondence: ; Tel.: +420-220-444-360
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180
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Liu CC, Zhang Y, Makris A, Rasmussen HH, Hennessy A. S-glutathionylation of the Na+-K+ Pump: A Novel Redox Mechanism in Preeclampsia. J Clin Endocrinol Metab 2021; 106:1091-1100. [PMID: 33382878 DOI: 10.1210/clinem/dgaa918] [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] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/12/2020] [Indexed: 11/19/2022]
Abstract
CONTEXT Reduced Na+-K+ pump activity is widely reported in preeclampsia and may be caused by a reversible oxidative modification that is a novel pathological feature of preeclampsia. OBJECTIVE This work aims to determine whether β 1 subunit (GSS-β 1) protein glutathionylation of the Na+-K + pump occurs in preeclampsia. METHODS The GSS-β1 of the Na+-K+ pump and its subunit expression in human placentas were compared between women with healthy pregnancies and women with preeclampsia. Human placental samples of pregnant women with preeclampsia (n = 11, mean gestational age 36.5 weeks) were used to examine the GSS-β 1 of the Na+-K+ pump, compared to healthy pregnancies (n = 11, mean gestational age 39 weeks).The potential pathogenetic role of GSS-β 1-mediated Na+-K+ pump dysfunction in preeclampsia was investigated. RESULTS Protein expression of the β 1 subunit was unchanged in placentas from women with preeclampsia vs those with normotensive pregnancies. Preeclamptic placentas had a significantly increased GSS-β 1 of the Na+-K+ pump compared to those from healthy pregnancies, and this was linked to a decrease in α 1/β 1 subunit coimmunoprecipitation. The cytosolic p47phox nicotinamide adenine dinucleotide phosphate hydrogen (NADPH) oxidase subunit and its coimmunoprecipitation with the α 1 Na+-K+ pump subunit was increased in preeclamptic placentas, thus implicating NADPH oxidase-dependent pump inhibition. CONCLUSIONS The high level of β 1 pump subunit glutathionylation provides new insights into the mechanism of Na+-K+ pump dysfunction in preeclampsia.
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Affiliation(s)
- Chia-Chi Liu
- Vascular Immunology Research Laboratory, The Heart Research Institute, University of Sydney, Newtown, NSW, Australia
- North Shore Heart Research Group, Kolling Medical Research Institute, University of Sydney, St Leonards, NSW, Australia
- School of Medicine, Western Sydney University, Campbelltown, NSW, Australia
| | - YunJia Zhang
- Clinical Research Laboratory, The Heart Research Institute, Newtown, NSW, Australia
| | - Angela Makris
- Vascular Immunology Research Laboratory, The Heart Research Institute, University of Sydney, Newtown, NSW, Australia
- School of Medicine, Western Sydney University, Campbelltown, NSW, Australia
- Renal Unit, Liverpool Hospital, Liverpool, NSW, Australia
| | - Helge H Rasmussen
- North Shore Heart Research Group, Kolling Medical Research Institute, University of Sydney, St Leonards, NSW, Australia
- Department of Cardiology, Royal North Shore Hospital, St Leonards, NSW, Australia
| | - Annemarie Hennessy
- Vascular Immunology Research Laboratory, The Heart Research Institute, University of Sydney, Newtown, NSW, Australia
- School of Medicine, Western Sydney University, Campbelltown, NSW, Australia
- Campbelltown Hospital, South Western Sydney Local Health District, Campbelltown, NSW, Australia
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181
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Silva CID, Gonçalves-de-Albuquerque CF, Moraes BPTD, Garcia DG, Burth P. Na/K-ATPase: Their role in cell adhesion and migration in cancer. Biochimie 2021; 185:1-8. [PMID: 33713729 DOI: 10.1016/j.biochi.2021.03.002] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/07/2020] [Revised: 03/03/2021] [Accepted: 03/04/2021] [Indexed: 12/18/2022]
Abstract
Na/K-ATPase (NKA) is a p-type transmembrane enzyme formed by three different subunits (α, β, and γ gamma). Primarily responsible for transporting sodium and potassium through the cell membrane, it also plays a critical role in intracellular signaling. The activation of diverse intracellular pathways may trigger cell death, survival, or even cell proliferation. Changes in the NKA functions or expression in isoforms subunits impact pathological conditions, such as cancer. The NKA function affects cell adhesion, motility, and migration, which are different in the physiological and pathological states. All enzyme subunits take part in the cell adhesion process, with the β subunit being the most studied. Thus, herein we aim to highlight NKA' central role in cell adhesion, motility, and migration in cancer cells.
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Affiliation(s)
- Camila Ignácio da Silva
- Laboratório de Enzimologia e Sinalização Celular, Departamento de Biologia Celular e Molecular, Instituto de Biologia, Universidade Federal Fluminense, Niterói, Brazil; Pós-Graduação em Ciências e Biotecnologia Universidade Federal Fluminense, Niterói, Brazil
| | - Cassiano Felippe Gonçalves-de-Albuquerque
- Laboratório de Imunofarmacologia, Instituto Oswaldo Cruz, Fundação Oswaldo Cruz, Rio de Janeiro, RJ, Brazil; Laboratorio de Imunofarmacologia, Departamento de Bioquímica, Universidade Federal do Estado do Rio de Janeiro, Rio de Janeiro, RJ, Brazil.
| | - Bianca Portugal Tavares de Moraes
- Laboratorio de Imunofarmacologia, Departamento de Bioquímica, Universidade Federal do Estado do Rio de Janeiro, Rio de Janeiro, RJ, Brazil
| | - Diogo Gomes Garcia
- Laboratório de Neurociências Translacional, Programa de Pós-Graduação em Neurologia, Universidade Federal do Estado do Rio de Janeiro, Rio de Janeiro, RJ, Brazil
| | - Patrícia Burth
- Laboratório de Enzimologia e Sinalização Celular, Departamento de Biologia Celular e Molecular, Instituto de Biologia, Universidade Federal Fluminense, Niterói, Brazil; Pós-Graduação em Ciências e Biotecnologia Universidade Federal Fluminense, Niterói, Brazil.
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182
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Bellot-Saez A, Stevenson R, Kékesi O, Samokhina E, Ben-Abu Y, Morley JW, Buskila Y. Neuromodulation of Astrocytic K + Clearance. Int J Mol Sci 2021; 22:ijms22052520. [PMID: 33802343 PMCID: PMC7959145 DOI: 10.3390/ijms22052520] [Citation(s) in RCA: 11] [Impact Index Per Article: 3.7] [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: 02/09/2021] [Revised: 02/25/2021] [Accepted: 02/25/2021] [Indexed: 12/21/2022] Open
Abstract
Potassium homeostasis is fundamental for brain function. Therefore, effective removal of excessive K+ from the synaptic cleft during neuronal activity is paramount. Astrocytes play a key role in K+ clearance from the extracellular milieu using various mechanisms, including uptake via Kir channels and the Na+-K+ ATPase, and spatial buffering through the astrocytic gap-junction coupled network. Recently we showed that alterations in the concentrations of extracellular potassium ([K+]o) or impairments of the astrocytic clearance mechanism affect the resonance and oscillatory behavior of both the individual and networks of neurons. These results indicate that astrocytes have the potential to modulate neuronal network activity, however, the cellular effectors that may affect the astrocytic K+ clearance process are still unknown. In this study, we have investigated the impact of neuromodulators, which are known to mediate changes in network oscillatory behavior, on the astrocytic clearance process. Our results suggest that while some neuromodulators (5-HT; NA) might affect astrocytic spatial buffering via gap-junctions, others (DA; Histamine) primarily affect the uptake mechanism via Kir channels. These results suggest that neuromodulators can affect network oscillatory activity through parallel activation of both neurons and astrocytes, establishing a synergistic mechanism to maximize the synchronous network activity.
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Affiliation(s)
- Alba Bellot-Saez
- School of Medicine, Western Sydney University, Campbelltown, NSW 2560, Australia; (A.B.-S.); (R.S.); (O.K.); (E.S.); (J.W.M.)
| | - Rebecca Stevenson
- School of Medicine, Western Sydney University, Campbelltown, NSW 2560, Australia; (A.B.-S.); (R.S.); (O.K.); (E.S.); (J.W.M.)
| | - Orsolya Kékesi
- School of Medicine, Western Sydney University, Campbelltown, NSW 2560, Australia; (A.B.-S.); (R.S.); (O.K.); (E.S.); (J.W.M.)
| | - Evgeniia Samokhina
- School of Medicine, Western Sydney University, Campbelltown, NSW 2560, Australia; (A.B.-S.); (R.S.); (O.K.); (E.S.); (J.W.M.)
| | - Yuval Ben-Abu
- Projects and Physics Section, Sapir Academic College, D.N. Hof Ashkelon, Sderot 79165, Israel;
| | - John W. Morley
- School of Medicine, Western Sydney University, Campbelltown, NSW 2560, Australia; (A.B.-S.); (R.S.); (O.K.); (E.S.); (J.W.M.)
| | - Yossi Buskila
- School of Medicine, Western Sydney University, Campbelltown, NSW 2560, Australia; (A.B.-S.); (R.S.); (O.K.); (E.S.); (J.W.M.)
- International Centre for Neuromorphic Systems, The MARCS Institute, Western Sydney University, Penrith, NSW 2751, Australia
- Correspondence: ; Tel.: +61-246203853
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183
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Dong XH, Lu ZF, Kang CM, Li XH, Haworth KE, Ma X, Lu JB, Liu XH, Fang FC, Wang CS, Ye JH, Zheng L, Wang Q, Ye S, Hu YW. The Long Noncoding RNA RP11-728F11.4 Promotes Atherosclerosis. Arterioscler Thromb Vasc Biol 2021; 41:1191-1204. [PMID: 33406853 DOI: 10.1161/atvbaha.120.315114] [Citation(s) in RCA: 13] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
Abstract
OBJECTIVE Noncoding RNAs are emerging as important players in gene regulation and cardiovascular diseases. Their roles in the pathogenesis of atherosclerosis are not fully understood. The purpose of this study was to determine the role played by a previously uncharacterized long noncoding RNA, RP11-728F11.4, in the development of atherosclerosis and the mechanisms by which it acts. Approach and Results: Expression microarray analysis revealed that atherosclerotic plaques had increased expression of RP11-728F11.4 as well as the cognate gene FXYD6 (FXYD domain containing ion transport regulator 6), which encodes a modulator of Na+/K+-ATPase. In vitro experiments showed that RP11-728F11.4 interacted with the RNA-binding protein EWSR1 (Ewings sarcoma RNA binding protein-1) and upregulated FXYD6 expression. Lentivirus-induced overexpression of RP11-728F11.4 in cultured monocytes-derived macrophages resulted in higher Na+/K+-ATPase activity, intracellular cholesterol accumulation, and increased proinflammatory cytokine production. The effects of RP11-728F11.4 were enhanced by siRNA-mediated knockdown of EWSR1 and reduced by downregulation of FXYD domain containing ion transport regulator 6. In vivo experiments in apoE knockout mice fed a Western diet demonstrated that RP11-728F11.4 increased proinflammatory cytokine production and augmented atherosclerotic lesions. CONCLUSIONS RP11-728F11.4 promotes atherosclerosis, with an influence on cholesterol homeostasis and proinflammatory molecule production, thus representing a potential therapeutic target. Graphic Abstract: A graphic abstract is available for this article.
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MESH Headings
- Animals
- Atherosclerosis/etiology
- Atherosclerosis/genetics
- Atherosclerosis/metabolism
- Cells, Cultured
- Cholesterol/metabolism
- Cytokines/metabolism
- Disease Models, Animal
- Endothelial Cells/metabolism
- Female
- Gene Knockdown Techniques
- Humans
- Ion Channels/genetics
- Ion Channels/metabolism
- Lipid Metabolism
- Male
- Mice
- Mice, Inbred C57BL
- Mice, Knockout, ApoE
- Middle Aged
- Plaque, Atherosclerotic/etiology
- Plaque, Atherosclerotic/genetics
- Plaque, Atherosclerotic/pathology
- RNA, Long Noncoding/genetics
- RNA, Long Noncoding/metabolism
- RNA-Binding Protein EWS/antagonists & inhibitors
- RNA-Binding Protein EWS/genetics
- RNA-Binding Protein EWS/metabolism
- Sodium-Potassium-Exchanging ATPase/metabolism
- Up-Regulation
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Affiliation(s)
- Xian-Hui Dong
- Department of Clinical Laboratory, Guangzhou Women and Children Medical Center, Guangzhou Medical University, China (X.-H.D., Y.-W.H.)
| | - Zhi-Feng Lu
- Laboratory Medicine Center (Z.-F.L., C.-M.K., X.-H. Li, X.-H. Liu, L.Z., Q.W., Y.-W.H.), Nanfang Hospital, Southern Medical University, Guangzhou, China
| | - Chun-Min Kang
- Laboratory Medicine Center (Z.-F.L., C.-M.K., X.-H. Li, X.-H. Liu, L.Z., Q.W., Y.-W.H.), Nanfang Hospital, Southern Medical University, Guangzhou, China
| | - Xue-Heng Li
- Laboratory Medicine Center (Z.-F.L., C.-M.K., X.-H. Li, X.-H. Liu, L.Z., Q.W., Y.-W.H.), Nanfang Hospital, Southern Medical University, Guangzhou, China
| | - Kim E Haworth
- Department of Cardiovascular Sciences and NIHR (National Institute for Health Research) Leicester Biomedical Research Centre, University of Leicester, United Kingdom (K.E.H., S.Y.)
| | - Xin Ma
- Department of Anesthesiology (X.M.), Nanfang Hospital, Southern Medical University, Guangzhou, China
| | - Jing-Bo Lu
- Department of Vascular Surgery (J.-B.L.), Nanfang Hospital, Southern Medical University, Guangzhou, China
- Department of Vascular Surgery, Shenzhen Sun Yat-Sen Cardiovascular Hospital, China (J.-B.L.)
| | - Xue-Hui Liu
- Laboratory Medicine Center (Z.-F.L., C.-M.K., X.-H. Li, X.-H. Liu, L.Z., Q.W., Y.-W.H.), Nanfang Hospital, Southern Medical University, Guangzhou, China
| | - Fu-Chun Fang
- Department of Stomatology (F.-C.F.), Nanfang Hospital, Southern Medical University, Guangzhou, China
| | - Claire S Wang
- Gonville and Caius College, University of Cambridge, United Kindgom (C.S.W.)
| | - John H Ye
- University Hospitals of Leicester NHS Trust, United Kingdom (J.H.Y.)
| | - Lei Zheng
- Laboratory Medicine Center (Z.-F.L., C.-M.K., X.-H. Li, X.-H. Liu, L.Z., Q.W., Y.-W.H.), Nanfang Hospital, Southern Medical University, Guangzhou, China
| | - Qian Wang
- Laboratory Medicine Center (Z.-F.L., C.-M.K., X.-H. Li, X.-H. Liu, L.Z., Q.W., Y.-W.H.), Nanfang Hospital, Southern Medical University, Guangzhou, China
| | - Shu Ye
- Department of Cardiovascular Sciences and NIHR (National Institute for Health Research) Leicester Biomedical Research Centre, University of Leicester, United Kingdom (K.E.H., S.Y.)
- Shantou University Medical College, China (S.Y.)
| | - Yan-Wei Hu
- Department of Clinical Laboratory, Guangzhou Women and Children Medical Center, Guangzhou Medical University, China (X.-H.D., Y.-W.H.)
- Laboratory Medicine Center (Z.-F.L., C.-M.K., X.-H. Li, X.-H. Liu, L.Z., Q.W., Y.-W.H.), Nanfang Hospital, Southern Medical University, Guangzhou, China
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184
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Jan V, Miš K, Nikolic N, Dolinar K, Petrič M, Bone A, Thoresen GH, Rustan AC, Marš T, Chibalin AV, Pirkmajer S. Effect of differentiation, de novo innervation, and electrical pulse stimulation on mRNA and protein expression of Na+,K+-ATPase, FXYD1, and FXYD5 in cultured human skeletal muscle cells. PLoS One 2021; 16:e0247377. [PMID: 33635930 PMCID: PMC7909653 DOI: 10.1371/journal.pone.0247377] [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] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/30/2020] [Accepted: 02/05/2021] [Indexed: 12/18/2022] Open
Abstract
Denervation reduces the abundance of Na+,K+-ATPase (NKA) in skeletal muscle, while reinnervation increases it. Primary human skeletal muscle cells, the most widely used model to study human skeletal muscle in vitro, are usually cultured as myoblasts or myotubes without neurons and typically do not contract spontaneously, which might affect their ability to express and regulate NKA. We determined how differentiation, de novo innervation, and electrical pulse stimulation affect expression of NKA (α and β) subunits and NKA regulators FXYD1 (phospholemman) and FXYD5 (dysadherin). Differentiation of myoblasts into myotubes under low serum conditions increased expression of myogenic markers CD56 (NCAM1), desmin, myosin heavy chains, dihydropyridine receptor subunit α1S, and SERCA2 as well as NKAα2 and FXYD1, while it decreased expression of FXYD5 mRNA. Myotubes, which were innervated de novo by motor neurons in co-culture with the embryonic rat spinal cord explants, started to contract spontaneously within 7–10 days. A short-term co-culture (10–11 days) promoted mRNA expression of myokines, such as IL-6, IL-7, IL-8, and IL-15, but did not affect mRNA expression of NKA, FXYDs, or myokines, such as musclin, cathepsin B, meteorin-like protein, or SPARC. A long-term co-culture (21 days) increased the protein abundance of NKAα1, NKAα2, FXYD1, and phospho-FXYD1Ser68 without attendant changes in mRNA levels. Suppression of neuromuscular transmission with α-bungarotoxin or tubocurarine for 24 h did not alter NKA or FXYD mRNA expression. Electrical pulse stimulation (48 h) of non-innervated myotubes promoted mRNA expression of NKAβ2, NKAβ3, FXYD1, and FXYD5. In conclusion, low serum concentration promotes NKAα2 and FXYD1 expression, while de novo innervation is not essential for upregulation of NKAα2 and FXYD1 mRNA in cultured myotubes. Finally, although innervation and EPS both stimulate contractions of myotubes, they exert distinct effects on the expression of NKA and FXYDs.
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Affiliation(s)
- Vid Jan
- Institute of Pathophysiology, Faculty of Medicine, University of Ljubljana, Ljubljana, Slovenia
| | - Katarina Miš
- Institute of Pathophysiology, Faculty of Medicine, University of Ljubljana, Ljubljana, Slovenia
| | - Natasa Nikolic
- Section for Pharmacology and Pharmaceutical Biosciences, Department of Pharmacy, University of Oslo, Oslo, Norway
| | - Klemen Dolinar
- Institute of Pathophysiology, Faculty of Medicine, University of Ljubljana, Ljubljana, Slovenia
| | - Metka Petrič
- Institute of Pathophysiology, Faculty of Medicine, University of Ljubljana, Ljubljana, Slovenia
| | - Andraž Bone
- Institute of Pathophysiology, Faculty of Medicine, University of Ljubljana, Ljubljana, Slovenia
| | - G. Hege Thoresen
- Section for Pharmacology and Pharmaceutical Biosciences, Department of Pharmacy, University of Oslo, Oslo, Norway
- Department of Pharmacology, Institute of Clinical Medicine, University of Oslo, Oslo, Norway
| | - Arild C. Rustan
- Section for Pharmacology and Pharmaceutical Biosciences, Department of Pharmacy, University of Oslo, Oslo, Norway
| | - Tomaž Marš
- Institute of Pathophysiology, Faculty of Medicine, University of Ljubljana, Ljubljana, Slovenia
| | - Alexander V. Chibalin
- National Research Tomsk State University, Tomsk, Russia
- Department of Molecular Medicine and Surgery, Integrative Physiology, Karolinska Institutet, Stockholm, Sweden
| | - Sergej Pirkmajer
- Institute of Pathophysiology, Faculty of Medicine, University of Ljubljana, Ljubljana, Slovenia
- * E-mail:
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185
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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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186
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Mantovani M, McNamara JC. Contrasting strategies of osmotic and ionic regulation in freshwater crabs and shrimps: gene expression of gill ion transporters. J Exp Biol 2021; 224:jeb233890. [PMID: 33443071 DOI: 10.1242/jeb.233890] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [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: 07/22/2020] [Accepted: 12/16/2020] [Indexed: 12/21/2022]
Abstract
Owing to their extraordinary niche diversity, the Crustacea are ideal for comprehending the evolution of osmoregulation. The processes that effect systemic hydro-electrolytic homeostasis maintain hemolymph ionic composition via membrane transporters located in highly specialized gill ionocytes. We evaluated physiological and molecular hyper- and hypo-osmoregulatory mechanisms in two phylogenetically distant, freshwater crustaceans, the crab Dilocarcinus pagei and the shrimp Macrobrachium jelskii, when osmotically challenged for up to 10 days. When in distilled water, D. pagei survived without mortality, hemolymph osmolality and [Cl-] increased briefly, stabilizing at initial values, while [Na+] decreased continually. Expression of gill V-type H+-ATPase (V-ATPase), Na+/K+-ATPase and Na+/K+/2Cl- symporter genes was unchanged. In M. jelskii, hemolymph osmolality, [Cl-] and [Na+] decreased continually for 12 h, the shrimps surviving only around 15-24 h exposure. Gill transporter gene expression increased 2- to 5-fold. After 10 days exposure to brackish water (25‰S), D. pagei was isosmotic, iso-chloremic and iso-natriuremic. Gill V-ATPase expression decreased while Na+/K+-ATPase and Na+/K+/2Cl- symporter expression was unchanged. In M. jelskii (20‰S), hemolymph was hypo-regulated, particularly [Cl-]. Transporter expression initially increased 3- to 12-fold, declining to control values. Gill V-ATPase expression underlies the ability of D. pagei to survive in fresh water while V-ATPase, Na+/K+-ATPase and Na+/K+/2Cl- symporter expression enables M. jelskii to confront hyper/hypo-osmotic challenges. These findings reveal divergent responses in two unrelated crustaceans inhabiting a similar osmotic niche. While D. pagei does not secrete salt, tolerating elevated cellular isosmoticity, M. jelskii exhibits clear hypo-osmoregulatory ability. Each species has evolved distinct strategies at the transcriptional and systemic levels during its adaptation to fresh water.
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Affiliation(s)
- Milene Mantovani
- Departamento de Biologia, Faculdade de Filosofia, Ciências e Letras de Ribeirão Preto, Universidade de São Paulo, Ribeirão Preto 14040-901, SP, Brazil
| | - John Campbell McNamara
- Departamento de Biologia, Faculdade de Filosofia, Ciências e Letras de Ribeirão Preto, Universidade de São Paulo, Ribeirão Preto 14040-901, SP, Brazil
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187
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Ajima MNO, Kumar K, Poojary N, Pandey PK. Oxidative stress biomarkers, biochemical responses and Na + -K + -ATPase activities in Nile tilapia, Oreochromis niloticus exposed to diclofenac. Comp Biochem Physiol C Toxicol Pharmacol 2021; 240:108934. [PMID: 33160042 DOI: 10.1016/j.cbpc.2020.108934] [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] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/18/2020] [Revised: 10/23/2020] [Accepted: 10/28/2020] [Indexed: 10/23/2022]
Abstract
The residues and metabolites from pharmaceuticals have been noted to cause adverse effects to both target and non-target aquatic organisms. The sublethal effects of diclofenac at 0.17, 0.34 and 0.68 mg L-1 on oxidative stress biomarkers, biochemical responses and Na+ -K+ -ATPase activities in the gill tissue of Nile tilapia, Oreochromis niloticus were investigated for 60 days. Elevated levels of some serum biochemical parameters including protein, glutamic oxalacetic transaminase, glucose, glutamic pyruvic transaminase, lactate dehydrogenase, alkaline phosphatase and also some catalysts of gluconeogenic enzymes such as glucose-6-phosphatase, fructose 1, 6 bisphosphatase in the fish liver, increase as the concentration of the diclofenac increased. The reactions of glutathione-S-transferase, catalase, lipid peroxidation, superoxide dismutase, glutathione peroxidase, carbonyl protein and reduced glutathione were elevated (p < 0.05) while the activities of Na+ -K+ -ATPase was significantly reduced (p < 0.05) in fish gill, indicating an adaptive response strategies to mitigate the impact of the drug on the exposed fish. Chronic exposure to sublethal diclofenac can induce oxidative stress and modulates serum biochemical indexes of O. niloticus, suggesting the need for close monitoring of the drug and their metabolites in aquatic environment considering the possible potential adverse effects it may cause even to non-target organisms.
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Affiliation(s)
- Malachy N O Ajima
- Department of Fisheries and Aquaculture Technology, Federal University of Technology, Owerri, Nigeria.
| | - Kundan Kumar
- Aquatic Environment and Health Management Division, ICAR- Central Institute of Fisheries Education, Mumbai, India
| | - Nalini Poojary
- Aquatic Environment and Health Management Division, ICAR- Central Institute of Fisheries Education, Mumbai, India
| | - Pramod K Pandey
- College of Fisheries, Central Agriculture University, Agartala, Tripura, India
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188
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Farag MR, Mahmoud HK, El-Sayed SAA, Ahmed SYA, Alagawany M, Abou-Zeid SM. Neurobehavioral, physiological and inflammatory impairments in response to bifenthrin intoxication in Oreochromis niloticus fish: Role of dietary supplementation with Petroselinum crispum essential oil. Aquat Toxicol 2021; 231:105715. [PMID: 33341507 DOI: 10.1016/j.aquatox.2020.105715] [Citation(s) in RCA: 18] [Impact Index Per Article: 6.0] [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: 10/21/2020] [Revised: 11/30/2020] [Accepted: 12/02/2020] [Indexed: 06/12/2023]
Abstract
This study was conceptualized in order to assess the 96-h LC50 of bifenthrin (BF) in O. niloticus and also to measure the biochemical, behavioral, and molecular responses of the fish suchronically exposed to a sub-lethal concentration of the insecticide. The role of Petroselinum crispum essential oil (PEO) supplementation in mitigating the resulted neurotoxic insult was also investigated. The acute toxicity study revealed that the 96-h LC50 of BF is 6.81 μg/L, and varying degrees of behavioral changes were recorded in a dose-dependent manner. The subchronic study revealed reduction of dissolved oxygen and increased ammonia in aquaria of BF-exposed fish. Clinical signs revealed high degree of discomfort and aggressiveness together with reductions in survival rate and body weight gain. The levels of monoamines in brain, and GABA and amino acids in serum were reduced, together with decreased activities of Na+/K+-ATPase and acetylcholine esterases (AchE). The activities of antioxidant enzymes were also diminshed in the brain while oxdative damage and DNA breaks were elevated. Myeloperoxidase (MPO) activity in serum increased with overexpression of the pro-inflammatory cytokines in the brain tissue. BF also upregulated the expression of brain-stress related genes HSP70, Caspase-3 and P53. Supplemention of PEO to BF markedly abrogated the toxic impacts of the insecticide, specially at the high level. These findings demonstrate neuroprotective, antioxidant, genoprotective, anti-inflammatory and antiapoptic effects of PEO in BF-intoxicated fish. Based on these mechanistic insights of PEO, we recommend its use as an invaluable supplement in the fish feed.
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Affiliation(s)
- Mayada R Farag
- Forensic Medicine and Toxicology Department, Veterinary Medicine Faculty, Zagazig University, Zagazig, 44511, Egypt.
| | - Hemat K Mahmoud
- Department of Animal Production, Faculty of Agriculture, Zagazig University, Zagazig, 44511, Egypt
| | - Sabry A A El-Sayed
- Department of Nutrition and Clinical Nutrition, Faculty of Veterinary Medicine, Zagazig University, Zagazig, 44511, Egypt
| | - Sarah Y A Ahmed
- Microbiology Department, Veterinary Medicine Faculty, Zagazig University, Zagazig, 44511, Egypt
| | - Mahmoud Alagawany
- Poultry Department, Faculty of Agriculture, Zagazig University, Zagazig, 44511, Egypt.
| | - Shimaa M Abou-Zeid
- Forensic Medicine and Toxicology Department, Faculty of Veterinary Medicine, University of Sadat City, 32897, Egypt
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189
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Fujishima A, Takahashi K, Goto M, Hirakawa T, Iwasawa T, Togashi K, Maeda E, Shirasawa H, Miura H, Sato W, Kumazawa Y, Terada Y. Live visualisation of electrolytes during mouse embryonic development using electrolyte indicators. PLoS One 2021; 16:e0246337. [PMID: 33513193 PMCID: PMC7845971 DOI: 10.1371/journal.pone.0246337] [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] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/23/2020] [Accepted: 01/18/2021] [Indexed: 11/27/2022] Open
Abstract
Studies have shown that some electrolytes, including Na+ and K+, play important roles in embryonic development. However, these studies evaluated these electrolytes by using inhibitors or knockout mice, with no mention on the changes in the intracellular electrolyte concentrations during embryogenesis. In this study, we used the electrolyte indicators CoroNa Green AM and ION Potassium Green-2 AM to directly visualise intracellular concentrations of Na+ and K+, respectively, at each embryonic developmental stage in mouse embryos. We directly observed intracellular electrolyte concentrations at the morula, blastocyst, and hatching stages. Our results revealed dynamic changes in intracellular electrolyte concentrations; we found that the intracellular Na+ concentration decreased, while K+ concentration increased during blastocoel formation. The degree of change in intensity in response to ouabain, an inhibitor of Na+/K+ ATPase, was considered to correspond to the degree of Na+/K+ ATPase activity at each developmental stage. Additionally, after the blastocyst stage, trophectoderm cells in direct contact with the blastocoel showed higher K+ concentrations than in direct contact with inner cell mass, indicating that Na+/K+ ATPase activity differs depending on the location in the trophectoderm. This is the first study to use CoroNa Green AM and ION Potassium Green-2 AM in mouse embryos and visualise electrolytes during embryonic development. The changes in electrolyte concentration observed in this study were consistent with the activity of Na+/K+ ATPase reported previously, and it was possible to image more detailed electrolyte behaviour in embryo cells. This method can be used to improve the understanding of cell physiology and is useful for future embryonic development studies.
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Affiliation(s)
- Akiko Fujishima
- Department of Obstetrics and Gynecology, Akita University Graduate School of Medicine, Akita, Japan
| | - Kazumasa Takahashi
- Department of Obstetrics and Gynecology, Akita University Graduate School of Medicine, Akita, Japan
| | - Mayumi Goto
- Department of Obstetrics and Gynecology, Akita University Graduate School of Medicine, Akita, Japan
| | - Takeo Hirakawa
- Department of Obstetrics and Gynecology, Akita University Graduate School of Medicine, Akita, Japan
| | - Takuya Iwasawa
- Department of Obstetrics and Gynecology, Omagari Kousei Medical Center, Akita, Japan
| | - Kazue Togashi
- Department of Obstetrics and Gynecology, Akita University Graduate School of Medicine, Akita, Japan
| | - Eri Maeda
- Department of Environmental Health Science and Public Health, Akita University Graduate School of Medicine, Akita, Japan
| | - Hiromitsu Shirasawa
- Department of Obstetrics and Gynecology, Akita University Graduate School of Medicine, Akita, Japan
| | - Hiroshi Miura
- Department of Obstetrics and Gynecology, Akita University Graduate School of Medicine, Akita, Japan
| | - Wataru Sato
- Department of Obstetrics and Gynecology, Akita University Graduate School of Medicine, Akita, Japan
| | - Yukiyo Kumazawa
- Department of Obstetrics and Gynecology, Akita University Graduate School of Medicine, Akita, Japan
| | - Yukihiro Terada
- Department of Obstetrics and Gynecology, Akita University Graduate School of Medicine, Akita, Japan
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190
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Höglund E, Høgberget R, Åtland Å, Haraldstad T, Øverli Ø, Vindas MA. Effects of repeated short episodes of environmental acidification on Atlantic salmon (Salmo salar) from a landlocked population. Sci Total Environ 2021; 753:141403. [PMID: 32889313 DOI: 10.1016/j.scitotenv.2020.141403] [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] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/19/2020] [Revised: 07/29/2020] [Accepted: 07/30/2020] [Indexed: 06/11/2023]
Abstract
Chronic or repeated exposure to environmental contaminants may result in allostatic overload, a physiological situation in which the costs of coping affect long-term survival and reproductive output. Continuous measurements in Otra, the largest river in southern Norway, show the occurrence of repeated 24-48 h episodes of acidification. This work investigates the impact of repeated short acidification episodes on a unique land-locked population of normally anadromous Atlantic salmon ("Bleke"). This was done by recording physiological measures of stress and allostatic load in fish exposed for 7 days to continuous or repeated episodes of simulated environmental acidification or untreated Otra water (controls). A standardized acute stress test was performed after these different exposure regimes, with brain and blood samples taken before (baseline) or after the stress test. Treatment effects on stress coping ability were assessed by neuroendocrine indicators, including telencephalic serotonergic activity and plasma cortisol. Continuous exposure to acidification resulted in increased baseline plasma Cl- and Na+ and elevated baseline plasma cortisol compared to episodic exposed fish. However, both episodic and continuous acidification resulted in similar increase in gill Al, indicating similar impact on gill permeability of these two exposures. This suggests a lower impact on the electrolyte homeostasis in episodic compared to continuous exposure and that this effect is not directly related to the effects of Al complexes binding to the gills. Furthermore, there were no treatment induced differences on stress coping ability, suggesting that episodic exposure to the sublethal concentrations of Al in pH 5.5 in the present study do not result in higher allostatic load than in control or continuous exposed Bleke.
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Affiliation(s)
- Erik Höglund
- Niva, Norsk Institutt for Vannforskning, Gaustadalléen 21, NO-0349 Oslo, Norway; Center of Coastal Research, University of Agder, 4604 Kristiansand, Norway.
| | - Rolf Høgberget
- Center of Coastal Research, University of Agder, 4604 Kristiansand, Norway
| | - Åse Åtland
- Niva, Norsk Institutt for Vannforskning, Gaustadalléen 21, NO-0349 Oslo, Norway
| | - Tormod Haraldstad
- Niva, Norsk Institutt for Vannforskning, Gaustadalléen 21, NO-0349 Oslo, Norway; Center of Coastal Research, University of Agder, 4604 Kristiansand, Norway
| | - Øyvind Øverli
- Department of Paraclinical Sciences, Norwegian University of Life Sciences, 0454 Oslo, Norway
| | - Marco A Vindas
- Department of Preclinical Sciences and Pathology, Norwegian University of Life Sciences, 0454 Oslo, Norway
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191
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Egnew N, Renukdas N, Romano N, Kelly AM, Lohakare J, Bishop WM, Lochmann RT, Sinha AK. Physio-biochemical, metabolic nitrogen excretion and ion-regulatory assessment in largemouth bass (Micropterus salmoides) following exposure to high environmental iron. Ecotoxicol Environ Saf 2021; 208:111526. [PMID: 33099141 DOI: 10.1016/j.ecoenv.2020.111526] [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] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/25/2020] [Revised: 10/11/2020] [Accepted: 10/14/2020] [Indexed: 05/20/2023]
Abstract
Iron overload is a significant water quality issue in many parts of the world. Therefore, we evaluated the potential toxic effects of waterborne elevated iron on largemouth bass (Micropterus salmoides), a highly valued sport and aquaculture fish species. First, a 96 h-LC50 toxicity assay was performed to understand the tolerance limit of this species to iron; and was determined to be 22.07 mg/L (as Fe3+). Thereafter, to get a better insight on the fish survival during long-term exposure to high environmental iron (HEI) (5.52 mg/L, 25% of the determined 96 h-LC50 value), a suite of physio-biochemical, nitrogenous metabolic and ion-regulatory compensatory responses were examined at 7, 14, 21 and 28 days. Results showed that oxygen consumption dropped significantly at 21 and 28 days of HEI exposure. Ammonia excretion rate (Jamm) was significantly inhibited from day 14 and remained suppressed until the last exposure period. The transcript concentration of Rhesus glycoproteins Rhcg2 declined; likely diminishing ammonia efflux out of gills. These changes were also reflected by a parallel increment in plasma ammonia levels. Under HEI exposure, ion-balance was negatively affected, manifested by reduced plasma [Na+] and parallel inhibition in branchial Na+/K+-ATPase activity. Muscle water content was elevated in HEI-exposed fish, signifying an osmo-regulatory compromise. HEI exposure also increased iron burden in plasma and gills. The iron accumulation pattern in gills was significantly correlated with a suppression of Jamm, branchial Rhcg2 expression and Na+/K+-ATPase activity. There was also a decline in the glycogen, protein and lipid reserves in the hepatic tissue from 14 days, 28 days and 21 days, respectively. Overall, we conclude that sub-lethal chronic iron exposure can impair normal physio-biochemical and ion-regulatory functions in largemouth bass. Moreover, this data set can be applied in assessing the environmental risk posed by a waterborne iron overload on aquatic life.
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Affiliation(s)
- Nathan Egnew
- Department of Aquaculture and Fisheries, University of Arkansas at Pine Bluff, 1200 North University Drive, Pine Bluff, AR 71601, USA
| | - Nilima Renukdas
- Department of Aquaculture and Fisheries, University of Arkansas at Pine Bluff, 1200 North University Drive, Pine Bluff, AR 71601, USA
| | - Nicholas Romano
- Department of Aquaculture and Fisheries, University of Arkansas at Pine Bluff, 1200 North University Drive, Pine Bluff, AR 71601, USA
| | - Anita M Kelly
- Department of Aquaculture and Fisheries, University of Arkansas at Pine Bluff, 1200 North University Drive, Pine Bluff, AR 71601, USA; Alabama Fish Farming Center, Auburn University, Greensboro, AL 36744, USA
| | - Jayant Lohakare
- Department of Agriculture-Animal Science, University of Arkansas at Pine Bluff, 1200 North University Drive, Pine Bluff, AR 71601, USA
| | - West M Bishop
- SePRO Research and Technology Campus, 16013 Watson Seed Farm Rd., Whitakers, NC 27891, USA
| | - Rebecca T Lochmann
- Department of Aquaculture and Fisheries, University of Arkansas at Pine Bluff, 1200 North University Drive, Pine Bluff, AR 71601, USA
| | - Amit Kumar Sinha
- Department of Aquaculture and Fisheries, University of Arkansas at Pine Bluff, 1200 North University Drive, Pine Bluff, AR 71601, USA.
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192
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Hodeify R, Chakkour M, Rida R, Kreydiyyeh S. PGE2 upregulates the Na+/K+ ATPase in HepG2 cells via EP4 receptors and intracellular calcium. PLoS One 2021; 16:e0245400. [PMID: 33444342 PMCID: PMC7808645 DOI: 10.1371/journal.pone.0245400] [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] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/30/2020] [Accepted: 12/29/2020] [Indexed: 11/18/2022] Open
Abstract
The Na+/K+ ATPase is a key regulator of the hepatocytes ionic homeostasis, which when altered may lead to many liver disorders. We demonstrated recently, a significant stimulation of the Na+/K+ ATPase in HepG2 cells treated with the S1P analogue FTY 720P, that was mediated through PGE2. The mechanism by which the prostaglandin exerts its effect was not investigated, and is the focus of this work. The type of receptors involved was determined using pharmacological inhibitors, while western blot analysis, fluorescence imaging of GFP-tagged Na+/K+ ATPase, and time-lapse imaging on live cells were used to detect changes in membrane abundance of the Na+/K+ ATPase. The activity of the ATPase was assayed by measuring the amount of inorganic phosphate liberated in the presence and absence of ouabain. The enhanced activity of the ATPase was not observed when EP4 receptors were blocked but still appeared in presence inhibitors of EP1, EP2 and EP3 receptors. The involvement of EP4 was confirmed by the stimulation observed with EP4 agonist. The stimulatory effect of PGE2 did not appear in presence of Rp-cAMP, an inhibitor of PKA, and was imitated by db-cAMP, a PKA activator. Chelating intracellular calcium with BAPTA-AM abrogated the effect of db-cAMP as well as that of PGE2, but PGE2 treatment in a calcium-free PBS medium did not, suggesting an involvement of intracellular calcium, that was confirmed by the results obtained with 2-APB treatment. Live cell imaging showed movement of GFP–Na+/K+ ATPase-positive vesicles to the membrane and increased abundance of the ATPase at the membrane after PGE2 treatment. It was concluded that PGE2 acts via EP4, PKA, and intracellular calcium.
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Affiliation(s)
- Rawad Hodeify
- Department of Biotechnology, School of Arts and Sciences, American University of Ras Al Khaimah, Ras Al Khaimah, United Arab Emirates
| | - Mohamed Chakkour
- Department of Biology, Faculty of Arts & Sciences, American University of Beirut, Beirut, Lebanon
| | - Reem Rida
- Department of Biology, Faculty of Arts & Sciences, American University of Beirut, Beirut, Lebanon
| | - Sawsan Kreydiyyeh
- Department of Biology, Faculty of Arts & Sciences, American University of Beirut, Beirut, Lebanon
- * E-mail:
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193
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Cao L, Xiong S, Wu Z, Ding L, Zhou Y, Sun H, Zhu M, Lee WT, Nie X, Bian JS. Anti-Na +/K +-ATPase immunotherapy ameliorates α-synuclein pathology through activation of Na +/K +-ATPase α1-dependent autophagy. Sci Adv 2021; 7:7/5/eabc5062. [PMID: 33571110 PMCID: PMC7840131 DOI: 10.1126/sciadv.abc5062] [Citation(s) in RCA: 14] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/29/2020] [Accepted: 12/09/2020] [Indexed: 05/06/2023]
Abstract
Na+/K+-ATPase (NKA) plays important roles in maintaining cellular homeostasis. Conversely, reduced NKA activity has been reported in aging and neurodegenerative diseases. However, little is known about the function of NKA in the pathogenesis of Parkinson's disease (PD). Here, we report that reduction of NKA activity in NKAα1+/- mice aggravates α-synuclein-induced pathology, including a reduction in tyrosine hydroxylase (TH) and deficits in behavioral tests for memory, learning, and motor function. To reverse this effect, we generated an NKA-stabilizing monoclonal antibody, DR5-12D, against the DR region (897DVEDSYGQQWTYEQR911) of the NKAα1 subunit. We demonstrate that DR5-12D can ameliorate α-synuclein-induced TH loss and behavioral deficits by accelerating α-synuclein degradation in neurons. The underlying mechanism for the beneficial effects of DR5-12D involves activation of NKAα1-dependent autophagy via increased AMPK/mTOR/ULK1 pathway signaling. Cumulatively, this work demonstrates that NKA activity is neuroprotective and that pharmacological activation of this pathway represents a new therapeutic strategy for PD.
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Affiliation(s)
- Lei Cao
- Department of Pharmacology, Yong Loo Lin School of Medicine, National University of Singapore, Singapore, Singapore
| | - Siping Xiong
- Department of Pharmacology, Yong Loo Lin School of Medicine, National University of Singapore, Singapore, Singapore
| | - Zhiyuan Wu
- Department of Pharmacology, Yong Loo Lin School of Medicine, National University of Singapore, Singapore, Singapore
| | - Lei Ding
- Department of Pharmacology, Yong Loo Lin School of Medicine, National University of Singapore, Singapore, Singapore
| | - Yebo Zhou
- Department of Pharmacology, Yong Loo Lin School of Medicine, National University of Singapore, Singapore, Singapore
| | - Haijian Sun
- Department of Pharmacology, Yong Loo Lin School of Medicine, National University of Singapore, Singapore, Singapore
| | - Mengyuan Zhu
- Department of Pharmacology, Yong Loo Lin School of Medicine, National University of Singapore, Singapore, Singapore
| | - Wei Thye Lee
- Department of Pharmacology, Yong Loo Lin School of Medicine, National University of Singapore, Singapore, Singapore
| | - Xiaowei Nie
- Department of Pharmacology, Yong Loo Lin School of Medicine, National University of Singapore, Singapore, Singapore.
| | - Jin-Song Bian
- Department of Pharmacology, Yong Loo Lin School of Medicine, National University of Singapore, Singapore, Singapore.
- Department of Pharmacology, School of Medicine, Southern University of Science and Technology, Shenzhen 518055, PR China
- National University of Singapore (Suzhou) Research Institute, Suzhou 215000, China
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194
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Ritter JK, Ahmad A, Mummalaneni S, Daneva Z, Dempsey SK, Li N, Li PL, Lyall V. Mechanism of Diuresis and Natriuresis by Cannabinoids: Evidence for Inhibition of Na +-K +-ATPase in Mouse Kidney Thick Ascending Limb Tubules. J Pharmacol Exp Ther 2021; 376:1-11. [PMID: 33087396 PMCID: PMC7745087 DOI: 10.1124/jpet.120.000163] [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] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/11/2020] [Accepted: 10/06/2020] [Indexed: 12/11/2022] Open
Abstract
The endocannabinoid, anandamide (AEA), stimulates cannabinoid receptors (CBRs) and is enriched in the kidney, especially the renal medulla. AEA infused into the renal outer medulla of mice stimulates urine flow rate and salt excretion. Here we show that these effects are blocked by the CBR type 1 (CB1) inverse agonist, rimonabant. Immunohistochemical analysis demonstrated the presence of CB1 in thick ascending limb (TAL) tubules. Western immunoblotting demonstrated the presence of CB1 (52 kDa) in the cortex and outer medulla of mouse kidney. The effect of direct [CP55940 (CP) or AEA] or indirect [fatty acyl amide hydrolase (FAAH) inhibitor, PF3845 (PF)] cannabinoidimetics on Na+ transport in isolated mouse TAL tubules was studied using the Na+-sensitive dye, SBFI-AM. Switching from 0 Na+ solution to control Ringer's solution (CR) rapidly increased TAL cell [Na+]i Addition of CP to CR produced a further elevation, similar in magnitude to that of ouabain, a Na+-K+-ATPase inhibitor. This [Na+]i-elevating effect of CP was time-dependent, required the presence of Na+ in the bathing solution, and was insensitive to Na+-K+-2Cl- cotransporter inhibition. Addition of PF to CR elevated [Na+]i in FAAH wild-type but not FAAH knockout (KO) TALs, whereas the additions of CP and AEA to PF-treated FAAH KO TALs increased [Na+]i An interaction between cannabinoidimetics and ouabain (Ou) was observed. Ou produced less increase in [Na+]i after cannabinoidimetic treatment, whereas cannabinoidimetics had less effect after Ou treatment. It is concluded that cannabinoidimetics, including CP and AEA, inhibit Na+ transport in TALs by inhibiting Na+ exit via Na+-K+-ATPase. SIGNIFICANCE STATEMENT: Cannabinoids including endocannabinoids induce renal urine and salt excretion and are proposed to play a physiological role in the regulation of blood pressure. Our data suggest that the mechanism of the cannabinoids involves inhibition of the sodium pump, Na+-K+-ATPase, in thick ascending limb cells and, likely, other proximal and distal tubular segments of the kidney nephron.
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Affiliation(s)
- Joseph K Ritter
- Departments of Pharmacology and Toxicology (J.K.R., A.A., Z.D., S.K.D., N.L., P.-L.L.) and Physiology and Biophysics (S.M., V.L.), Virginia Commonwealth University, Richmond, Virginia
| | - Ashfaq Ahmad
- Departments of Pharmacology and Toxicology (J.K.R., A.A., Z.D., S.K.D., N.L., P.-L.L.) and Physiology and Biophysics (S.M., V.L.), Virginia Commonwealth University, Richmond, Virginia
| | - Shobha Mummalaneni
- Departments of Pharmacology and Toxicology (J.K.R., A.A., Z.D., S.K.D., N.L., P.-L.L.) and Physiology and Biophysics (S.M., V.L.), Virginia Commonwealth University, Richmond, Virginia
| | - Zdravka Daneva
- Departments of Pharmacology and Toxicology (J.K.R., A.A., Z.D., S.K.D., N.L., P.-L.L.) and Physiology and Biophysics (S.M., V.L.), Virginia Commonwealth University, Richmond, Virginia
| | - Sara K Dempsey
- Departments of Pharmacology and Toxicology (J.K.R., A.A., Z.D., S.K.D., N.L., P.-L.L.) and Physiology and Biophysics (S.M., V.L.), Virginia Commonwealth University, Richmond, Virginia
| | - Ningjun Li
- Departments of Pharmacology and Toxicology (J.K.R., A.A., Z.D., S.K.D., N.L., P.-L.L.) and Physiology and Biophysics (S.M., V.L.), Virginia Commonwealth University, Richmond, Virginia
| | - Pin-Lan Li
- Departments of Pharmacology and Toxicology (J.K.R., A.A., Z.D., S.K.D., N.L., P.-L.L.) and Physiology and Biophysics (S.M., V.L.), Virginia Commonwealth University, Richmond, Virginia
| | - Vijay Lyall
- Departments of Pharmacology and Toxicology (J.K.R., A.A., Z.D., S.K.D., N.L., P.-L.L.) and Physiology and Biophysics (S.M., V.L.), Virginia Commonwealth University, Richmond, Virginia
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195
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Irachi S, Hall DJ, Fleming MS, Maugars G, Björnsson BT, Dufour S, Uchida K, McCormick SD. Photoperiodic regulation of pituitary thyroid-stimulating hormone and brain deiodinase in Atlantic salmon. Mol Cell Endocrinol 2021; 519:111056. [PMID: 33069856 DOI: 10.1016/j.mce.2020.111056] [Citation(s) in RCA: 11] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/15/2020] [Revised: 09/11/2020] [Accepted: 10/06/2020] [Indexed: 10/23/2022]
Abstract
Seasonal timing is important for many critical life history events of vertebrates, and photoperiod is often used as a reliable seasonal cue. In mammals and birds, it has been established that a photoperiod-driven seasonal clock resides in the brain and pituitary, and is driven by increased levels of pituitary thyroid stimulating hormone (TSH) and brain type 2 iodothyronine deiodinase (DIO2), which leads to local increases in triiodothyronine (T3). In order to determine if a similar mechanism occurs in fish, we conducted photoperiod manipulations in anadromous (migratory) Atlantic salmon (Salmo salar) that use photoperiod to time the preparatory development of salinity tolerance which accompanies downstream migration in spring. Changing daylength from short days (light:dark (LD) 10:14) to long days (LD 16:8) for 20 days increased gill Na+/K+-ATPase (NKA) activity, gill NKAα1b abundance and plasma growth hormone (GH) levels that normally accompany increased salinity tolerance of salmon in spring. Long-day exposure resulted in five-fold increases in pituitary tshβb mRNA levels after 10 days and were sustained for at least 20 days. tshβb mRNA levels in the saccus vasculosus were low and not influenced by photoperiod. Increased daylength resulted in significant increases in dio2b mRNA levels in the hypothalamus and midbrain/optic tectum regions of the brain. The results are consistent with the presence of a photoperiod-driven seasonal clock in fish which involves pituitary TSH, brain DIO2 and the subsequent production of T3, supporting the hypothesis that this is a common feature of photoperiodic regulation of seasonality in vertebrates.
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Affiliation(s)
- Shotaro Irachi
- U.S. Geological Survey, Leetown Science Center, Conte Anadromous Fish Research Laboratory, Turners Falls, MA, USA; Graduate School of Agriculture, University of Miyazaki, 1-1 Gakuen-kibanadai Nishi, Miyazaki, 889-2192, Japan
| | - Daniel J Hall
- U.S. Geological Survey, Leetown Science Center, Conte Anadromous Fish Research Laboratory, Turners Falls, MA, USA
| | - Mitchell S Fleming
- Biology of Aquatic Organisms and Ecosystems (BOREA), Muséum National d'Histoire Naturelle, CNRS, IRD, Sorbonne Université, Université de Caen Normandie, Université des Antilles, Paris, France; Department of Biological Sciences (BIO), University of Bergen, Bergen, Norway
| | - Gersende Maugars
- Biology of Aquatic Organisms and Ecosystems (BOREA), Muséum National d'Histoire Naturelle, CNRS, IRD, Sorbonne Université, Université de Caen Normandie, Université des Antilles, Paris, France
| | - Björn Thrandur Björnsson
- Fish Endocrinology Laboratory, Department of Biological and Environmental Sciences, University of Gothenburg, Gothenburg, Sweden
| | - Sylvie Dufour
- Biology of Aquatic Organisms and Ecosystems (BOREA), Muséum National d'Histoire Naturelle, CNRS, IRD, Sorbonne Université, Université de Caen Normandie, Université des Antilles, Paris, France
| | - Katsuhisa Uchida
- Graduate School of Agriculture, University of Miyazaki, 1-1 Gakuen-kibanadai Nishi, Miyazaki, 889-2192, Japan
| | - Stephen D McCormick
- U.S. Geological Survey, Leetown Science Center, Conte Anadromous Fish Research Laboratory, Turners Falls, MA, USA; Department of Biology, University of Massachusetts, Amherst, MA, USA.
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196
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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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197
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Fujii T. [Different Membrane Environments Generate Multiple Functions of P-type Ion Pumps]. YAKUGAKU ZASSHI 2021; 141:1217-1222. [PMID: 34719540 DOI: 10.1248/yakushi.21-00135] [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: 11/22/2022]
Abstract
P-type ion pumps (P-type ATPases) are involved in various fundamental biological processes. For example, the gastric proton pump (H+,K+-ATPase) and sodium pump (Na+,K+-ATPase) are responsible for secretion of gastric acid and maintenance of cell membrane potential, respectively. In this review, we summarize three topics of our studies. The first topic is gastric H+,K+-ATPase associated with Cl--transporting proteins (Cl-/H+ exchanger ClC-5 and K+-Cl- cotransporter KCC4). In gastric parietal cells, we found that ClC-5 is predominantly expressed in intracellular tubulovesicles and that KCC4 is predominantly expressed in the apical membrane. Gastric acid (HCl) secretion may be accomplished by the two different complexes of H+,K+-ATPase and Cl--transporting protein. The second topic focuses on the Na+,K+-ATPase α1-isoform (α1NaK) associated with the volume-regulated anion channel (VRAC). In the cholesterol-enriched membrane microdomains of human cancer cells, we found that α1NaK has a receptor-like (non-pumping) function and that binding of low concentrations (nM level) of cardiac glycosides to α1NaK activates VRAC and exerts anti-cancer effects without affecting the pumping function of α1NaK. The third topic is the Na+,K+-ATPase α3-isoform (α3NaK) in human cancer cells. We found that α3NaK is abnormally expressed in the intracellular vesicles of attached cancer cells and that the plasma membrane translocation of α3NaK upon cell detachment contributes to the survival of metastatic cancer cells. Our results indicate that multiple functions of P-type ion pumps are generated by different membrane environments and their associated proteins.
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Affiliation(s)
- Takuto Fujii
- Department of Pharmaceutical Physiology, Faculty of Pharmaceutical Sciences, University of Toyama
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198
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Arystarkhova E, Ozelius LJ, Brashear A, Sweadner KJ. Misfolding, altered membrane distributions, and the unfolded protein response contribute to pathogenicity differences in Na,K-ATPase ATP1A3 mutations. J Biol Chem 2021; 296:100019. [PMID: 33144327 PMCID: PMC7949067 DOI: 10.1074/jbc.ra120.015271] [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] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/17/2020] [Revised: 10/22/2020] [Accepted: 11/03/2020] [Indexed: 02/06/2023] Open
Abstract
Missense mutations in ATP1A3, the α3 isoform of Na,K-ATPase, cause neurological phenotypes that differ greatly in symptoms and severity. A mechanistic basis for differences is lacking, but reduction of activity alone cannot explain them. Isogenic cell lines with endogenous α1 and inducible exogenous α3 were constructed to compare mutation properties. Na,K-ATPase is made in the endoplasmic reticulum (ER), but the glycan-free catalytic α subunit complexes with glycosylated β subunit in the ER to proceed through Golgi and post-Golgi trafficking. We previously observed classic evidence of protein misfolding in mutations with severe phenotypes: differences in ER retention of endogenous β1 subunit, impaired trafficking of α3, and cytopathology, suggesting that they misfold during biosynthesis. Here we tested two mutations associated with different phenotypes: D923N, which has a median age of onset of hypotonia or dystonia at 3 years, and L924P, with severe infantile epilepsy and profound impairment. Misfolding during biosynthesis in the ER activates the unfolded protein response, a multiarmed program that enhances protein folding capacity, and if that fails, triggers apoptosis. L924P showed more nascent protein retention in ER than D923N; more ER-associated degradation of α3 (ERAD); larger differences in Na,K-ATPase subunit distributions among subcellular fractions; and greater inactivation of eIF2α, a major defensive step of the unfolded protein response. In L924P there was also altered subcellular distribution of endogenous α1 subunit, analogous to a dominant negative effect. Both mutations showed pro-apoptotic sensitization by reduced phosphorylation of BAD. Encouragingly, however, 4-phenylbutyrate, a pharmacological corrector, reduced L924P ER retention, increased α3 expression, and restored morphology.
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Affiliation(s)
- Elena Arystarkhova
- Laboratory of Membrane Biology, Department of Neurosurgery, Massachusetts General Hospital, Boston, Massachusetts, USA; Department of Neurology, Massachusetts General Hospital, Boston, Massachusetts, USA.
| | - Laurie J Ozelius
- Department of Neurology, Massachusetts General Hospital, Boston, Massachusetts, USA
| | - Allison Brashear
- Department of Medicine, University of California at Davis Medical School, Sacramento, California, USA
| | - Kathleen J Sweadner
- Laboratory of Membrane Biology, Department of Neurosurgery, Massachusetts General Hospital, Boston, Massachusetts, USA; Department of Neurology, Massachusetts General Hospital, Boston, Massachusetts, USA.
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199
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Abbasi A, Pakravan N, Hassan ZM. Hyaluronic Acid Improves Hydrogen Peroxide Modulatory Effects on Calcium Channel and Sodium-Potassium Pump in 4T1 Breast Cancer Cell Line. Oxid Med Cell Longev 2020; 2020:8681349. [PMID: 33456676 PMCID: PMC7787766 DOI: 10.1155/2020/8681349] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 04/19/2020] [Revised: 11/19/2020] [Accepted: 12/10/2020] [Indexed: 12/19/2022]
Abstract
Maintaining homeostasis of ion concentrations is critical in cancer cells. Under hypoxia, the levels of channels and pumps in cancer cells are more active than normal cells suggesting ion channels as a suitable therapeutic target. One of the contemporary ways for cancer therapy is oxidative stress. However, the effective concentration of oxidative stress on tumor cells has been reported to be toxic for normal cells as well. In this study, we benefited from the modifying effects of hyaluronic acid (HA) on H2O2, as a free radical source, to make a gradual release of oxidative stress on cancer cells while preventing/decreasing damage to normal cells under normoxia and hypoxic conditions. To do so, we initially investigated the optimal concentration of HA antioxidant capacity by the DPPH test. In the next step, we found optimum H2O2 dose by treating the 4T1 breast cancer cell line with increasing concentrations (0, 10, 20, 50,100, 200, 500, and 1000 μM) of H2O2 alone or H2O2 + HA (83%) for 24 hrs. The calcium channel and the sodium-potassium pumps were then evaluated by measuring the levels of calcium, sodium, and potassium ions using an atomic absorption flame spectrophotometer. The results revealed that treatment with H2O2 or H2O2+ HA led to an intracellular increase of calcium, sodium, and potassium in the normoxic and hypoxic circumstances in a dose-dependent manner. It is noteworthy that H2O2 + HA treatment had more favorable and controllable effects compared with H2O2 alone. Moreover, HA optimizes the antitumor effect of oxidative stress exerted by H2O2 making H2O2 + HA suitable for clinical use in cancer treatment along with chemotherapy.
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Affiliation(s)
- Ardeshir Abbasi
- Department of Immunology, Faculty of Medical Sciences, Tarbiat Modares University, Tehran, Iran
| | - Nafiseh Pakravan
- Department of Immunology, Medical School, Alborz University of Medical Sciences, Karaj, Iran
| | - Zuhair Mohammad Hassan
- Department of Immunology, Faculty of Medical Sciences, Tarbiat Modares University, Tehran, Iran
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200
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Karayel O, Michaelis AC, Mann M, Schulman BA, Langlois CR. DIA-based systems biology approach unveils E3 ubiquitin ligase-dependent responses to a metabolic shift. Proc Natl Acad Sci U S A 2020; 117:32806-32815. [PMID: 33288721 PMCID: PMC7768684 DOI: 10.1073/pnas.2020197117] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.8] [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] [Indexed: 02/07/2023] Open
Abstract
The yeast Saccharomyces cerevisiae is a powerful model system for systems-wide biology screens and large-scale proteomics methods. Nearly complete proteomics coverage has been achieved owing to advances in mass spectrometry. However, it remains challenging to scale this technology for rapid and high-throughput analysis of the yeast proteome to investigate biological pathways on a global scale. Here we describe a systems biology workflow employing plate-based sample preparation and rapid, single-run, data-independent mass spectrometry analysis (DIA). Our approach is straightforward, easy to implement, and enables quantitative profiling and comparisons of hundreds of nearly complete yeast proteomes in only a few days. We evaluate its capability by characterizing changes in the yeast proteome in response to environmental perturbations, identifying distinct responses to each of them and providing a comprehensive resource of these responses. Apart from rapidly recapitulating previously observed responses, we characterized carbon source-dependent regulation of the GID E3 ligase, an important regulator of cellular metabolism during the switch between gluconeogenic and glycolytic growth conditions. This unveiled regulatory targets of the GID ligase during a metabolic switch. Our comprehensive yeast system readout pinpointed effects of a single deletion or point mutation in the GID complex on the global proteome, allowing the identification and validation of targets of the GID E3 ligase. Moreover, this approach allowed the identification of targets from multiple cellular pathways that display distinct patterns of regulation. Although developed in yeast, rapid whole-proteome-based readouts can serve as comprehensive systems-level assays in all cellular systems.
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Affiliation(s)
- Ozge Karayel
- Department of Proteomics and Signal Transduction, Max Planck Institute of Biochemistry, 82152 Martinsried, Germany
| | - André C Michaelis
- Department of Proteomics and Signal Transduction, Max Planck Institute of Biochemistry, 82152 Martinsried, Germany
| | - Matthias Mann
- Department of Proteomics and Signal Transduction, Max Planck Institute of Biochemistry, 82152 Martinsried, Germany;
| | - Brenda A Schulman
- Department of Molecular Machines and Signaling, Max Planck Institute of Biochemistry, 82152 Martinsried, Germany
| | - Christine R Langlois
- Department of Molecular Machines and Signaling, Max Planck Institute of Biochemistry, 82152 Martinsried, Germany
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