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Deb VK, Jain U. Ti 3C 2 (MXene), an advanced carrier system: role in photothermal, photoacoustic, enhanced drugs delivery and biological activity in cancer therapy. Drug Deliv Transl Res 2024:10.1007/s13346-024-01572-3. [PMID: 38713400 DOI: 10.1007/s13346-024-01572-3] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 03/11/2024] [Indexed: 05/08/2024]
Abstract
In the realm of healthcare and the advancing field of medical sciences, the development of efficient drug delivery systems become an immense promise to cure several diseases. Despite considerable advancements in drug delivery systems, numerous challenges persist, necessitating further enhancements to optimize patient outcomes. Smart nano-carriers, for instance, 2D sheets nano-carriers are the recently emerging nanosheets that may garner attention for targeted delivery of bioactive compounds, drugs, and genes to kill cancer cells. Within these advancements, Ti3C2TX-MXene, characterized as a two-dimensional transition metal carbide, has surfaced as a prominent intelligent nanocarrier within nanomedicine. Its noteworthy characteristics facilitated it as an ideal nanocarrier for cancer therapy. In recent advancements in drug delivery research, Ti3C2TX-MXene 2D nanocarriers have been designed to release drugs in response to specific stimuli, guided by distinct physicochemical parameters. This review emphasized the multifaceted role of Ti3C2TX-MXene as a potential carrier for delivering poorly hydrophilic drugs to cancer cells, facilitated by various polymer coatings. Furthermore, beyond drug delivery, this smart nanocarrier demonstrates utility in photoacoustic imaging and photothermal therapy, further highlighting its significant role in cellular mechanisms.
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Affiliation(s)
- Vishal Kumar Deb
- School of Health Sciences and Technology (SoHST), UPES, Dehradun 248007, Uttarakhand, India
| | - Utkarsh Jain
- School of Health Sciences and Technology (SoHST), UPES, Dehradun 248007, Uttarakhand, India.
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2
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Blaustein MP, Hamlyn JM. Sensational site: the sodium pump ouabain-binding site and its ligands. Am J Physiol Cell Physiol 2024; 326:C1120-C1177. [PMID: 38223926 DOI: 10.1152/ajpcell.00273.2023] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/22/2023] [Revised: 12/22/2023] [Accepted: 01/10/2024] [Indexed: 01/16/2024]
Abstract
Cardiotonic steroids (CTS), used by certain insects, toads, and rats for protection from predators, became, thanks to Withering's trailblazing 1785 monograph, the mainstay of heart failure (HF) therapy. In the 1950s and 1960s, we learned that the CTS receptor was part of the sodium pump (NKA) and that the Na+/Ca2+ exchanger was critical for the acute cardiotonic effect of digoxin- and ouabain-related CTS. This "settled" view was upended by seven revolutionary observations. First, subnanomolar ouabain sometimes stimulates NKA while higher concentrations are invariably inhibitory. Second, endogenous ouabain (EO) was discovered in the human circulation. Third, in the DIG clinical trial, digoxin only marginally improved outcomes in patients with HF. Fourth, cloning of NKA in 1985 revealed multiple NKA α and β subunit isoforms that, in the rodent, differ in their sensitivities to CTS. Fifth, the NKA is a cation pump and a hormone receptor/signal transducer. EO binding to NKA activates, in a ligand- and cell-specific manner, several protein kinase and Ca2+-dependent signaling cascades that have widespread physiological effects and can contribute to hypertension and HF pathogenesis. Sixth, all CTS are not equivalent, e.g., ouabain induces hypertension in rodents while digoxin is antihypertensinogenic ("biased signaling"). Seventh, most common rodent hypertension models require a highly ouabain-sensitive α2 NKA and the elevated blood pressure is alleviated by EO immunoneutralization. These numerous phenomena are enabled by NKA's intricate structure. We have just begun to understand the endocrine role of the endogenous ligands and the broad impact of the ouabain-binding site on physiology and pathophysiology.
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Affiliation(s)
- Mordecai P Blaustein
- Department of Physiology, University of Maryland School of Medicine, Baltimore, Maryland, United States
- Department of Medicine, University of Maryland School of Medicine, Baltimore, Maryland, United States
| | - John M Hamlyn
- Department of Physiology, University of Maryland School of Medicine, Baltimore, Maryland, United States
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Tepavcevic S, Romic S, Zec M, Culafic T, Stojiljkovic M, Ivkovic T, Pantelic M, Kostic M, Stanisic J, Koricanac G. Effects of Walnut-Rich Diet on Cation-Handling Proteins in the Heart of Healthy and Metabolically Compromised Male Rats. J Med Food 2023; 26:849-857. [PMID: 37889606 DOI: 10.1089/jmf.2022.0157] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/29/2023] Open
Abstract
The transport of cations in the cardiomyocytes, crucial for the functioning of the heart, can be affected by walnut diet due to the high content of polyunsaturated fatty acids. Healthy and metabolically compromised rats (drinking 10% fructose solution) were subjected to a diet supplemented with 2.4 g of walnuts for 6 weeks to investigate the effect on proteins involved in cation transport in the heart cells. Fructose increased the level of the α1 subunit of Na+/K+-ATPase and the phosphorylation of extracellular signal-regulated kinase 1/2 in the heart of control and walnut-eating rats, while elevated L-type calcium channel α (LTCCα), sodium-calcium exchanger 1 (NCX1), and Maxi Kα level were observed only in rats that did not consume walnuts. However, walnuts significantly increased the cardiac content of LTCC, NCX1, and Maxi Kα, as well as Kir6.1 and SUR2B subunits of KATP channel, but only in fructose-naive rats. In animals that drank fructose, a significant increasing effect of walnuts was observed only in Akt kinase phosphorylation, which may be a part of the antiarrhythmic mechanism of decreasing cation currents in cardiomyocytes. The walnut diet-induced increase in LTCC and NCX1 expression in healthy rats may indicate intense cardiac calcium turnover, whereas the effect on Kir6.1 and SUR2B subunits suggests stimulation of KATP channel transport in the cardiac vasculature. The effects of walnuts on the cation-handling proteins in the heart, mostly limited to healthy animals, suggest the possible use of a walnut-supplemented diet in the prevention rather than the treatment of cardiological channelopathies.
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Affiliation(s)
- Snezana Tepavcevic
- Laboratory for Molecular Biology and Endocrinology, Vinča Institute of Nuclear Sciences, National Institute of the Republic of Serbia, University of Belgrade, Belgrade, Serbia
| | - Snjezana Romic
- Laboratory for Molecular Biology and Endocrinology, Vinča Institute of Nuclear Sciences, National Institute of the Republic of Serbia, University of Belgrade, Belgrade, Serbia
| | - Manja Zec
- Colorado Program for Musculoskeletal Research, Department of Orthopedics, University of Colorado Anschutz Medical Campus, Aurora, Colorado, USA
| | - Tijana Culafic
- Laboratory for Molecular Biology and Endocrinology, Vinča Institute of Nuclear Sciences, National Institute of the Republic of Serbia, University of Belgrade, Belgrade, Serbia
| | - Mojca Stojiljkovic
- Laboratory for Molecular Biology and Endocrinology, Vinča Institute of Nuclear Sciences, National Institute of the Republic of Serbia, University of Belgrade, Belgrade, Serbia
| | - Tamara Ivkovic
- Laboratory for Molecular Biology and Endocrinology, Vinča Institute of Nuclear Sciences, National Institute of the Republic of Serbia, University of Belgrade, Belgrade, Serbia
| | - Marija Pantelic
- Laboratory for Molecular Biology and Endocrinology, Vinča Institute of Nuclear Sciences, National Institute of the Republic of Serbia, University of Belgrade, Belgrade, Serbia
| | - Milan Kostic
- Laboratory for Molecular Biology and Endocrinology, Vinča Institute of Nuclear Sciences, National Institute of the Republic of Serbia, University of Belgrade, Belgrade, Serbia
| | - Jelena Stanisic
- Laboratory for Molecular Biology and Endocrinology, Vinča Institute of Nuclear Sciences, National Institute of the Republic of Serbia, University of Belgrade, Belgrade, Serbia
| | - Goran Koricanac
- Laboratory for Molecular Biology and Endocrinology, Vinča Institute of Nuclear Sciences, National Institute of the Republic of Serbia, University of Belgrade, Belgrade, Serbia
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Leng B, Deng L, Tan J, Lee WT, Cao CR, Wang ZP, Huang DJ, Nie XW, Bian JS. Targeting the Na +/K + ATPase DR-region with DR-Ab improves doxorubicin-induced cardiotoxicity. Free Radic Biol Med 2023; 204:38-53. [PMID: 37100355 DOI: 10.1016/j.freeradbiomed.2023.04.008] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/26/2023] [Revised: 04/04/2023] [Accepted: 04/18/2023] [Indexed: 04/28/2023]
Abstract
Doxorubicin (DOX) is a potent chemotherapeutic drug for various cancers. Yet, the cardiotoxic side effects limit its application in clinical uses, in which ferroptosis serves as a crucial pathological mechanism in DOX-induced cardiotoxicity (DIC). A reduction of Na+/K + ATPase (NKA) activity is closely associated with DIC progression. However, whether abnormal NKA function was involved in DOX-induced cardiotoxicity and ferroptosis remains unknown. Here, we aim to decipher the cellular and molecular mechanisms of dysfunctional NKA in DOX-induced ferroptosis and investigate NKA as a potential therapeutic target for DIC. A decrease activity of NKA further aggravated DOX-triggered cardiac dysfunction and ferroptosis in NKAα1 haploinsufficiency mice. In contrast, antibodies against the DR-region of NKAα-subunit (DR-Ab) attenuated the cardiac dysfunction and ferroptosis induced by DOX. Mechanistically, NKAα1 interacted with SLC7A11 to form a novel protein complex, which was directly implicated in the disease progression of DIC. Furthermore, the therapeutic effect of DR-Ab on DIC was mediated by reducing ferroptosis by promoting the association of NKAα1/SLC7A11 complex and maintaining the stability of SLC7A11 on the cell surface. These results indicate that antibodies targeting the DR-region of NKA may serve as a novel therapeutic strategy to alleviate DOX-induced cardiotoxicity.
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Affiliation(s)
- Bin Leng
- Department of Food Science and Technology, National University of Singapore, 2 Science Drive 2, Singapore, 117542, Singapore; National University of Singapore (Suzhou) Research Institute, 377 Linquan Street, Suzhou, 215123, Jiangsu, China
| | - Lin Deng
- Department of Pharmacology, School of Medicine, Southern University of Science and Technology, Shenzhen, Guangdong, 518055, China
| | - Jianxin Tan
- Lung Transplant Group, Wuxi People's Hospital Affiliated to Nanjing Medical University, Wuxi, 214023, China
| | - Wei-Thye Lee
- Department of Pharmacology, Yong Loo Lin School of Medicine, National University of Singapore, Singapore, 117600, Singapore
| | - Cheng-Rui Cao
- Department of Pharmacology, School of Medicine, Southern University of Science and Technology, Shenzhen, Guangdong, 518055, China
| | - Zi-Ping Wang
- Department of Pharmacology, School of Medicine, Southern University of Science and Technology, Shenzhen, Guangdong, 518055, China
| | - De-Jian Huang
- Department of Food Science and Technology, National University of Singapore, 2 Science Drive 2, Singapore, 117542, Singapore; National University of Singapore (Suzhou) Research Institute, 377 Linquan Street, Suzhou, 215123, Jiangsu, China.
| | - Xiao-Wei Nie
- Shenzhen Key Laboratory of Respiratory Diseases, Shenzhen People's Hospital (The First Affiliated Hospital, Southern University of Science and Technology), Shenzhen, 518055, China.
| | - Jin-Song Bian
- Department of Pharmacology, School of Medicine, Southern University of Science and Technology, Shenzhen, Guangdong, 518055, China; National University of Singapore (Suzhou) Research Institute, 377 Linquan Street, Suzhou, 215123, Jiangsu, China.
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Oluranti OI, Adeyemo VA, Achile EO, Fatokun BP, Ojo AO. Rutin Improves Cardiac and Erythrocyte Membrane-Bound ATPase Activities in Male Rats Exposed to Cadmium Chloride and Lead Acetate. Biol Trace Elem Res 2022; 200:1181-1189. [PMID: 33844168 DOI: 10.1007/s12011-021-02711-4] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/18/2021] [Accepted: 04/06/2021] [Indexed: 01/09/2023]
Abstract
Cardiovascular diseases have been associated with cadmium (Cd) and lead (Pb). Impaired Ca2+ and Na+/K+-ATPase activities have also been linked to hemolytic and cardiovascular disorders. This study investigated the effect of rutin on Cd and/or Pb-induced cardiac and erythrocyte disorders in male rats. Twenty-five (25) male Wistar rats were treated as (n=5): Control, Pb (60 mg/kg, p.o), Cd (5 mg/kg, p.o), Pb + Cd, Rutin + Pb + Cd (50 mg/kg Rt, 60 mg/kg Pb, 5 mg/kg Cd, p.o). Plasma electrolyte and Ca2+- and Na+/K+-ATPase activities in the erythrocyte and heart of the rats were assayed. There was an increased and decreased activity of cardiac and erythrocyte Na+/K+-ATPase in Pb- (172%) and Cd- (33.7%) treated groups, respectively. However, rutin increased erythrocyte Na+/K+-ATPase activity in Cd + Pb when compared with Cd and Cd + Pb groups. Erythrocyte Ca2+-ATPase activity was decreased in the Pb (68%), Cd (68%) and Cd + Pb (55.3%) groups. Cardiac Na+/K+-ATPase activity was not altered in Pb and Cd groups while it decreased in Cd + Pb. Rutin increased the activity of the pump in Cd +Pb-treated rats compared to the Cd+Pb group. Therefore, rutin reversed cadmium- and lead-induced impaired cardiac and erythrocyte membrane Ca2+- and Na+/K+-ATPase activities. Graphical Abstract Dotted lines-decrease activity, curved lines-increased activity (created with BioRender.com ).
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Affiliation(s)
- Olufemi I Oluranti
- Applied and Environmental Physiology Unit, Department of Physiology, Bowen University, P.M.B 284, Iwo, Osun State, Nigeria.
| | - Victor A Adeyemo
- Applied and Environmental Physiology Unit, Department of Physiology, Bowen University, P.M.B 284, Iwo, Osun State, Nigeria
| | - Esther O Achile
- Applied and Environmental Physiology Unit, Department of Physiology, Bowen University, P.M.B 284, Iwo, Osun State, Nigeria
| | - Bosede P Fatokun
- Applied and Environmental Physiology Unit, Department of Physiology, Bowen University, P.M.B 284, Iwo, Osun State, Nigeria
| | - Alaba O Ojo
- Cardiovascular Physiology Unit, Department of Physiology, Bowen University, P.M.B 284, Iwo, Osun State, Nigeria
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Cui D, Kong N, Ding L, Guo Y, Yang W, Yan F. Ultrathin 2D Titanium Carbide MXene (Ti 3 C 2 T x ) Nanoflakes Activate WNT/HIF-1α-Mediated Metabolism Reprogramming for Periodontal Regeneration. Adv Healthc Mater 2021; 10:e2101215. [PMID: 34586717 DOI: 10.1002/adhm.202101215] [Citation(s) in RCA: 18] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/21/2021] [Revised: 09/08/2021] [Indexed: 12/17/2022]
Abstract
Periodontal defect regeneration in severe periodontitis relies on the differentiation and proliferation of periodontal ligament cells (PDLCs). Recently, an emerging 2D nanomaterial, MXene (Ti3 C2 Tx ), has gained more and more attention due to the extensive antibacterial and anticancer activity, while its potential biomedical application on tissue regeneration remains unclear. Through a combination of experimental and multiscale simulation schemes, Ti3 C2 Tx has exhibited satisfactory biocompatibility and induced distinguish osteogenic differentiation of human PDLCs (hPDLCs), with upregulated osteogenesis-related genes. Ti3 C2 Tx manages to activate the Wnt/β-catenin signaling pathway by enhancing the Wnt-Frizzled complex binding, thus stabilizing HIF-1α and altering metabolic reprogramming into glycolysis. In vivo, hPDLCs pretreated by Ti3 C2 Tx display excellent performance in new bone formation and osteoclast inhibition with enhanced RUNX2, HIF-1α, and β-catenin in an experimental rat model of periodontal fenestration defects, indicating that this material has high efficiency of periodontal regeneration promotion. It is demonstrated in this work that Ti3 C2 Tx has highly efficient therapeutic effects in osteogenic differentiation and periodontal defect repairment.
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Affiliation(s)
- Di Cui
- Nanjing Stomatological Hospital Medical School of Nanjing University Nanjing Jiangsu 210008 China
| | - Na Kong
- School of Life and Environmental Science Deakin University Waurn Ponds Victoria 3216 Australia
| | - Liang Ding
- Nanjing Stomatological Hospital Medical School of Nanjing University Nanjing Jiangsu 210008 China
| | - Yachong Guo
- Kuang Yaming Honors School Nanjing University Nanjing 210023 China
- Institute Theory of Polymers Leibniz‐Institut für Polymerforschung Dresden Dresden 01069 Germany
| | - Wenrong Yang
- School of Life and Environmental Science Deakin University Waurn Ponds Victoria 3216 Australia
| | - Fuhua Yan
- Nanjing Stomatological Hospital Medical School of Nanjing University Nanjing Jiangsu 210008 China
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Tang Z, Chen S, Ni Y, Zhao R, Zhu X, Yang X, Zhang X. Role of Na +, K +-ATPase ion pump in osteoinduction. Acta Biomater 2021; 129:293-308. [PMID: 34087440 DOI: 10.1016/j.actbio.2021.05.026] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/31/2021] [Revised: 05/24/2021] [Accepted: 05/26/2021] [Indexed: 12/14/2022]
Abstract
Porous biphasic calcium phosphate bioceramic (BCP) possesses osteoinductivity to induce the osteoblastic commitment of mesenchymal stem cells (MSCs) and ectopic bone formation. However, the underlying mechanism remains enigmatic. We performed a gene array analysis of MSCs cocultured with BCP to screen for candidate osteoinductive modulators. Na+, K+-ATPase (NKA), an ion transporter, therefore was identified as a crucial ion transporter in regulating the osteogenesis of the cells. NKA activator, a polyclonal antibody, enriched the cytomembrane abundance of NKA and lead to an enhanced osteogenic effect of BCP. As indicated in gene array analysis and suggested by co-immunoprecipitation assay, protein phosphatase 2A (PP2A) was elevated by BCP to dephosphorylate NKA and prevent its endocytosis. The inhibition of NKA by ouabain resulted in an adverse effect on osteoinductivity of BCP. We further altered NKA activity in mice implanted with BCP and found that the intensity and incidence of osteoinduction was increased by the NKA activator. We went one step further by investigating the potential of targeting NKA in osteoporotic bone regeneration. Activating NKA upregulated osteogenic gene expression and calcium deposition ability of osteoporotic osteoblasts. Furthermore, activation of NKA in mice ameliorated estrogen-deficiency induced bone loss, in terms of increased bone mass and improved bending strength. With this osteoinductive bioceramic derived ion transporter target, we demonstrate that the activation of NKA has significant potential to revolutionize the regeneration of bone. STATEMENT OF SIGNIFICANCE: In this study, we identified an important role of Na+, K+-ATPase (NKA) have played in osteoinductivity of biphasic calcium phosphate bioceramic (BCP). Furthermore, we demonstrated the therapeutic potential of targeting NKA in osteoporotic bone regeneration. Numerous gene and protein targets to treat osteoporosis were discovered every year, mainly obtained by genomic and proteomic screenings of a large population. In contrast, our study identified an unrevealed bone regenerating target from the upregulated genes induced by an osteoinductive biomaterial. The approach was cost-saving since it did not require a large sample pool. Furthermore, the target derived from this approach was proven to be anabolic. Identification of an anabolic agent holds significant value since most of the current anti-osteoporotic therapies are antiresorptive.
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DR region of Na +-K +-ATPase is a new target to protect heart against oxidative injury. Sci Rep 2018; 8:13100. [PMID: 30166619 PMCID: PMC6117330 DOI: 10.1038/s41598-018-31460-z] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/06/2017] [Accepted: 08/20/2018] [Indexed: 01/11/2023] Open
Abstract
Previous studies have shown that the activity and expression of Na+/K+-ATPase (NKA) are down-regulated in the failing hearts, and that an antibody against the DR-region of NKA (DR-Ab) can stimulate its activity. The present study was designed to investigate the beneficial effects of this antibody against cardiac injury and the underlying mechanisms. We found that DR-Ab improved cardiac function, alleviated cardiac hypertrophy and reduced oxidative stress in isoproterenol-treated mice. In AC16 human cardiomyocytes, DR-Ab increased cell viability and attenuated apoptosis under oxidative stress. Corresponding to the observation of reduced NKA activity, NKA abundance on plasma membrane was lowered during oxidative stress. Suppressed activity of protein phosphatase 2 A (PP2A) was responsible for the loss of membrane NKA due to the increased phosphorylation of key serine residues that trigger endocytosis. Incubation with DR-Ab restored PP2A activity and stabilized NKA expression on the plasma membrane. Inhibitors of PP2A abolished the protective effect of DR-Ab against oxidative stress. In summary, our data indicate that loss of membrane NKA may contribute to cardiac pathologies in heart failure. DR-Ab, by stabilizing membrane NKA, protects cardiomyocytes against oxidative injury and improves cardiac function in the failing hearts, suggesting a novel approach to treat heart failure.
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Anguita E, Villalobo A. Ca 2+ signaling and Src-kinases-controlled cellular functions. Arch Biochem Biophys 2018; 650:59-74. [DOI: 10.1016/j.abb.2018.05.005] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/15/2018] [Revised: 04/26/2018] [Accepted: 05/07/2018] [Indexed: 12/16/2022]
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Gong H, Lü P, Zhang J, Li D, Zheng J, Song J. Na+/K+‑ATPase DR region‑specific antibody protects U251 cells against hypoxia reperfusion‑induced injury via the PI3K/AKT and ERK pathways. Mol Med Rep 2017; 16:7901-7906. [PMID: 28983584 PMCID: PMC5779871 DOI: 10.3892/mmr.2017.7622] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/22/2015] [Accepted: 12/28/2017] [Indexed: 02/06/2023] Open
Abstract
Cerebral ischemia is a condition in which there is insufficient blood flow to the brain to meet metabolic demand. This leads to poor oxygen supply or cerebral hypoxia and to the death of brain tissue or cerebral infarction/ischemic stroke. In the present study, an Na+/K+-ATPase (NKA) DR region-specific antibody (DRSAb) was established and purified and it was demonstrated that DRSAb induced a protective effect on human astrocytes (U251) via the phosphoinositide 3-kinase (PI3K)/AKT and extracellular signal-regulated protein kinase (ERK) signaling pathways. The binding of DRSAb on NKA was revealed using flow cytometry. High signals were detected on U251 cells incubated with DRSAb, but not with control sera or BSA. The viability of the hypoxia/reperfusion (H/R)-treated cells was markedly increased by DRSAb administration of 0.3–0.5 µM. The optimal concentration of DRSAb was 0.4 µM for attenuation of the injury induced by H/R. The administration of 0.4 µM DRSAb markedly reduced the number of apoptotic cells compared with control sera. The application of PD98059, an ERK inhibitor, and LY-294002, an AKT inhibitor, attenuated the protective effect induced by DRSAb in the U251 cells subjected to H/R. Furthermore, the application of LY294002 prior to incubation with DRSAb eliminated the activation of ERK1/2, whereas the use of PD98059 failed to attenuate the effect of DRSAb on PI3K/AKT activation. These results indicated that the protective effects of DRSAb against H/R injury in U251 cells occurred via stimulation of the PI3K/AKT and ERK signaling pathways.
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Affiliation(s)
- Huilin Gong
- Department of Pathology, The First Affiliated Hospital of Xi'an Jiaotong University, Xi'an, Shaanxi 710061, P.R. China
| | - Pengbiao Lü
- Department of Oncological and Thoracic Surgery, Hanzhong People's Hospital, Hanzhong, Shaanxi 723000, P.R. China
| | - Jiangwei Zhang
- Hospital of Nephrology, The First Affiliated Hospital of Xi'an Jiaotong University, Xi'an, Shaanxi 710061, P.R. China
| | - Dandong Li
- Department of Neurosurgery, The First Affiliated Hospital of Xi'an Jiaotong University, Xi'an, Shaanxi 710061, P.R. China
| | - Jin Zheng
- Hospital of Nephrology, The First Affiliated Hospital of Xi'an Jiaotong University, Xi'an, Shaanxi 710061, P.R. China
| | - Jinning Song
- Department of Neurosurgery, The First Affiliated Hospital of Xi'an Jiaotong University, Xi'an, Shaanxi 710061, P.R. China
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Anguita E, Villalobo A. Src-family tyrosine kinases and the Ca 2+ signal. BIOCHIMICA ET BIOPHYSICA ACTA-MOLECULAR CELL RESEARCH 2016; 1864:915-932. [PMID: 27818271 DOI: 10.1016/j.bbamcr.2016.10.022] [Citation(s) in RCA: 39] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/20/2016] [Revised: 10/25/2016] [Accepted: 10/30/2016] [Indexed: 01/08/2023]
Abstract
In this review, we shall describe the rich crosstalk between non-receptor Src-family kinases (SFKs) and the Ca2+ transient generated in activated cells by a variety of extracellular and intracellular stimuli, resulting in diverse signaling events. The exchange of information between SFKs and Ca2+ is reciprocal, as it flows in both directions. These kinases are main actors in pathways leading to the generation of the Ca2+ signal, and reciprocally, the Ca2+ signal modulates SFKs activity and functions. We will cover how SFKs participate in the generation of the cytosolic Ca2+ rise upon activation of a series of receptors and the mechanism of clearance of this Ca2+ signal. The role of SFKs modulating Ca2+-translocating channels participating in these events will be amply discussed. Finally, the role of the Ca2+ sensor protein calmodulin on the activity of c-Src, and potentially on other SFKs, will be outlined as well. This article is part of a Special Issue entitled: ECS Meeting edited by Claus Heizmann, Joachim Krebs and Jacques Haiech.
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Affiliation(s)
- Estefanía Anguita
- Department of Cancer Biology, Instituto de Investigaciones Biomédicas, Consejo Superior de Investigaciones Científicas and Universidad Autónoma de Madrid, c/ Arturo Duperier 4, E-28029 Madrid, Spain
| | - Antonio Villalobo
- Department of Cancer Biology, Instituto de Investigaciones Biomédicas, Consejo Superior de Investigaciones Científicas and Universidad Autónoma de Madrid, c/ Arturo Duperier 4, E-28029 Madrid, Spain.
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Gong H, Sun J, Xue W, Tian P, Ding X, Yan H, Li Y, Zheng J. Protective effect of truncated Na+/K+-ATPase β on ischemia/reperfusion-induced renal injury in rats. Exp Biol Med (Maywood) 2015; 239:677-85. [PMID: 24737734 DOI: 10.1177/1535370213517613] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022] Open
Abstract
Renal ischemia/reperfusion(I/R) is an important injury part of ischemic acute renal failure, and it is also the main factor that affects the early functional recovery and the long-term survival of transplanted kidney in renal transplantation. In this study, we cloned and expressed truncated Na+/K+-ATPase β(tNKAβ) and demonstrated that tNKAβ could activate NKA α subunit and induce protective effect on human kidney-2(HK-2) cells via PKCɛ signal pathway. The half maximum effective concentrations (EC₅₀) of tNKAβ were 0.24 µM. Furthermore, the application of EAVSLKPT (PKCɛ inhibitor) could abolish the protective effect of tNKAβ in HK-2 cells subjected to ischemia/reperfusion. To identify the protective effect of tNKAβ against the I/R injury in the kidney, Sprague-Dawley rats were treated with tNKAβ (75 mg/kg) for 2 h before ischemia. The tNKAβ-treated group demonstrated a significant improvement in renal function with a lower serum creatinine and blood urea nitrogen (BUN) levels on postoperative days 1-6. Renal sections obtained from rats of the I/R group showed serious renal injury which included degeneration of tubular structure, tubular dilation, swelling and necrosis, luminal congestion, and muddy brown casts formed by sloughing of severely damaged tubular epithelial cells. However, sections of rats that were administered with tNKAβ 2 h before reperfusion showed marked reduction of the histological features of renal injury compared with kidneys that were subjected to I/R only. In conclusion, the protective effects of tNKAβ against renal I/R injury have been evaluated for the first time, and these protective effects may occur via stimulation of PKCɛ pathways.
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Fioresi M, Simões MR, Furieri LB, Broseghini-Filho GB, Vescovi MVA, Stefanon I, Vassallo DV. Chronic lead exposure increases blood pressure and myocardial contractility in rats. PLoS One 2014; 9:e96900. [PMID: 24841481 PMCID: PMC4026242 DOI: 10.1371/journal.pone.0096900] [Citation(s) in RCA: 35] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/26/2013] [Accepted: 04/13/2014] [Indexed: 11/18/2022] Open
Abstract
We investigated the cardiovascular effects of lead exposure, emphasising its direct action on myocardial contractility. Male Wistar rats were sorted randomly into two groups: control (Ct) and treatment with 100 ppm of lead (Pb) in the drinking water. Blood pressure (BP) was measured weekly. At the end of the treatment period, the animals were anaesthetised and haemodynamic parameters and contractility of the left ventricular papillary muscles were recorded. Blood and tissue samples were properly stored for further biochemical investigations. Statistical analyses were considered to be significant at p<0.05. The lead concentrations in the blood reached approximately 13 µg/dL, while the bone was the site of the highest deposition of this metal. BP in the Pb-treated group was higher from the first week of lead exposure and remained at the same level over the next four weeks. Haemodynamic evaluations revealed increases in systolic (Ct: 96±3.79 vs. Pb: 116±1.37 mmHg) and diastolic blood pressure (Ct: 60±2.93 vs. Pb: 70±3.38 mmHg), left ventricular systolic pressure (Ct: 104±5.85 vs. Pb: 120±2.51 mmHg) and heart rate (Ct: 307±10 vs. Pb: 348±16 bpm). Lead treatment did not alter the force and time derivatives of the force of left ventricular papillary muscles that were contracting isometrically. However, our results are suggestive of changes in the kinetics of calcium (Ca++) in cardiomyocytes increased transarcolemmal Ca++ influx, low Ca++ uptake by the sarcoplasmic reticulum and high extrusion by the sarcolemma. Altogether, these results show that despite the increased Ca++ influx that was induced by lead exposure, the myocytes had regulatory mechanisms that prevented increases in force, as evidenced in vivo by the increased systolic ventricular pressure.
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Affiliation(s)
- Mirian Fioresi
- Department of Physiological Sciences, Federal University of Espírito Santo, Vitoria, Espírito Santo, Brazil
- Department of Nursing, Federal University of Espírito Santo, Vitoria, Espírito Santo, Brazil
- * E-mail:
| | - Maylla Ronacher Simões
- Department of Physiological Sciences, Federal University of Espírito Santo, Vitoria, Espírito Santo, Brazil
| | - Lorena Barros Furieri
- Department of Physiological Sciences, Federal University of Espírito Santo, Vitoria, Espírito Santo, Brazil
- Department of Nursing, Federal University of Espírito Santo, Vitoria, Espírito Santo, Brazil
| | | | | | - Ivanita Stefanon
- Department of Physiological Sciences, Federal University of Espírito Santo, Vitoria, Espírito Santo, Brazil
| | - Dalton Valentim Vassallo
- Department of Physiological Sciences, Federal University of Espírito Santo, Vitoria, Espírito Santo, Brazil
- Health Science Centre of Vitória-EMESCAM, Vitória, Espírito Santo, Brazil
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14
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Almagro JC, Gilliland GL, Breden F, Scott JK, Sok D, Pauthner M, Reichert JM, Helguera G, Andrabi R, Mabry R, Bléry M, Voss JE, Laurén J, Abuqayyas L, Barghorn S, Ben-Jacob E, Crowe JE, Huston JS, Johnston SA, Krauland E, Lund-Johansen F, Marasco WA, Parren PWHI, Xu KY. Antibody engineering and therapeutics, The Annual Meeting of the Antibody Society: December 8-12, 2013, Huntington Beach, CA. MAbs 2014; 6:577-618. [PMID: 24589717 PMCID: PMC4011904 DOI: 10.4161/mabs.28421] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/14/2023] Open
Abstract
The 24th Antibody Engineering & Therapeutics meeting brought together a broad range of participants who were updated on the latest advances in antibody research and development. Organized by IBC Life Sciences, the gathering is the annual meeting of The Antibody Society, which serves as the scientific sponsor. Preconference workshops on 3D modeling and delineation of clonal lineages were featured, and the conference included sessions on a wide variety of topics relevant to researchers, including systems biology; antibody deep sequencing and repertoires; the effects of antibody gene variation and usage on antibody response; directed evolution; knowledge-based design; antibodies in a complex environment; polyreactive antibodies and polyspecificity; the interface between antibody therapy and cellular immunity in cancer; antibodies in cardiometabolic medicine; antibody pharmacokinetics, distribution and off-target toxicity; optimizing antibody formats for immunotherapy; polyclonals, oligoclonals and bispecifics; antibody discovery platforms; and antibody-drug conjugates.
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Affiliation(s)
| | | | | | | | - Devin Sok
- The Scripps Research Institute; La Jolla, CA USA
| | | | | | - Gustavo Helguera
- CONICET; Laboratorio Biotecnología Farmacéutica; Instituto de Biología y Medicina Experimental, IBYME; Ciudad Autónoma de Buenos Aires, Argentina
| | | | | | | | - James E Voss
- The Scripps Research Institute; La Jolla, CA USA
| | - Juha Laurén
- Regeneron Pharmaceuticals, Inc.; Tarrytown, NY USA
| | | | | | | | - James E Crowe
- Vanderbilt University Medical Center, Nashville, TN, USA
| | | | | | | | | | | | | | - Kai Y Xu
- University of Maryland; Baltimore, MD USA
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15
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Strilakou AA, Tsakiris ST, Kalafatakis KG, Stylianaki AT, Karkalousos PL, Koulouris AV, Mourouzis IS, Liapi CA. Carnitine modulates crucial myocardial adenosine triphosphatases and acetylcholinesterase enzyme activities in choline-deprived rats. Can J Physiol Pharmacol 2014; 92:78-84. [PMID: 24383876 DOI: 10.1139/cjpp-2013-0165] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022]
Abstract
Choline is an essential nutrient, and choline deficiency has been associated with cardiovascular morbidity. Choline is also the precursor of acetylcholine (cholinergic component of the heart's autonomic nervous system), whose levels are regulated by acetylcholinesterase (AChE). Cardiac contraction-relaxation cycles depend on ion gradients established by pumps like the adenosine triphosphatases (ATPases) Na(+)/K(+)-ATPase and Mg(2+)-ATPase. This study aimed to investigate the impact of dietary choline deprivation on the activity of rat myocardial AChE (cholinergic marker), Na(+)/K(+)-ATPase, and Mg(2+)-ATPase, and the possible effects of carnitine supplementation (carnitine, structurally relevant to choline, is used as an adjunct in treating cardiac diseases). Adult male albino Wistar rats were distributed among 4 groups, and were fed a standard or choline-deficient diet for one month with or without carnitine in their drinking water (0.15% w/v). The enzyme activities were determined spectrophotometrically in the myocardium homogenate. Choline deficiency seems to affect the activity of the aforementioned parameters, but only the combination of choline deprivation and carnitine supplementation increased myocardial Na(+)/K(+)-ATPase activity along with a concomitant decrease in the activities of Mg(2+)-ATPase and AChE. The results suggest that carnitine, in the setting of choline deficiency, modulates cholinergic myocardial neurotransmission and the ATPase activity in favour of cardiac work efficiency.
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Affiliation(s)
- Athina A Strilakou
- a Department of Pharmacology, Medical School, National and Kapodistrian University of Athens, 75 Mikras Asias Street, Athens GR-11527, Greece
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16
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Shi Q, Zeng J, Dong Y, Xu KY. Concurrent impairment of (Na++K+)-ATPase activity in multi-organ of type-1 diabetic NOD mice. J Diabetes Complications 2013; 27:29-33. [PMID: 22906552 DOI: 10.1016/j.jdiacomp.2012.07.004] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/03/2012] [Revised: 06/15/2012] [Accepted: 07/13/2012] [Indexed: 11/25/2022]
Abstract
BACKGROUND Type-1 diabetes causes serious complications. Detailed molecular pathways of type-1 diabetes-mediated organ dysfunction are not completely understood. Significantly depressed (Na(+)+K(+))-ATPase (NKA) activity has been found in erythrocytes, pancreatic β-cells, nerve cells, and muscle tissues of type-1 diabetic patients and rodent animal models. The characteristics of NKA in the development of the type-1 diabetes-mediated complications remain obscure. Here we investigated whether alterations of NKA activity in heart, kidney, and pancreas of type-1 diabetic mice occur simultaneously and whether depressed NKA activity is a universal phenomenon in major organs in the development of type-1 diabetes-induced complications. METHODS Female non-obese diabetic (NOD) and non-obese resistant mice were used for the study. Mice blood glucose was monitored and ouabain-sensitive NKA activity was determined. RESULTS Experimental results reveal that reduced NKA activity correlates with the progression of elevated blood glucose along with marked altered NKA apparent Na(+) affinity in all three organs of NOD mice. No significant changes of NKA protein expression were detected while the enzyme activity was reduced in tested mice, suggesting an inactive form of NKA might present in different tissues of the NOD mice. CONCLUSION Our study suggests that concurrent impairment of NKA function in multi-organ may serve as one of the molecular pathways participating in and contributing to the mechanism of type-1 diabetes-induced complications in NOD mice. A successful protection of NKA function from injury might offer a good intervention for controlling the progression of the disease.
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Affiliation(s)
- Qixin Shi
- Department of Surgery, University of Maryland School of Medicine, Baltimore, MD 21201, USA
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Erickson JR, He BJ, Grumbach IM, Anderson ME. CaMKII in the cardiovascular system: sensing redox states. Physiol Rev 2011; 91:889-915. [PMID: 21742790 DOI: 10.1152/physrev.00018.2010] [Citation(s) in RCA: 176] [Impact Index Per Article: 13.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022] Open
Abstract
The multifunctional Ca(2+)- and calmodulin-dependent protein kinase II (CaMKII) is now recognized to play a central role in pathological events in the cardiovascular system. CaMKII has diverse downstream targets that promote vascular disease, heart failure, and arrhythmias, so improved understanding of CaMKII signaling has the potential to lead to new therapies for cardiovascular disease. CaMKII is a multimeric serine-threonine kinase that is initially activated by binding calcified calmodulin (Ca(2+)/CaM). Under conditions of sustained exposure to elevated Ca(2+)/CaM, CaMKII transitions into a Ca(2+)/CaM-autonomous enzyme by two distinct but parallel processes. Autophosphorylation of threonine-287 in the CaMKII regulatory domain "traps" CaMKII into an open configuration even after Ca(2+)/CaM unbinding. More recently, our group identified a pair of methionines (281/282) in the CaMKII regulatory domain that undergo a partially reversible oxidation which, like autophosphorylation, prevents CaMKII from inactivating after Ca(2+)/CaM unbinding. Here we review roles of CaMKII in cardiovascular disease with an eye to understanding how CaMKII may act as a transduction signal to connect pro-oxidant conditions into specific downstream pathological effects that are relevant to rare and common forms of cardiovascular disease.
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Affiliation(s)
- Jeffrey R Erickson
- Department of Pharmacology, University of California at Davis, Davis, California 95616, USA.
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Acute lead exposure increases arterial pressure: role of the renin-angiotensin system. PLoS One 2011; 6:e18730. [PMID: 21494558 PMCID: PMC3073979 DOI: 10.1371/journal.pone.0018730] [Citation(s) in RCA: 45] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/06/2010] [Accepted: 03/15/2011] [Indexed: 11/25/2022] Open
Abstract
Background Chronic lead exposure causes hypertension and cardiovascular disease. Our purpose was to evaluate the effects of acute exposure to lead on arterial pressure and elucidate the early mechanisms involved in the development of lead-induced hypertension. Methodology/Principal Findings Wistar rats were treated with lead acetate (i.v. bolus dose of 320 µg/Kg), and systolic arterial pressure, diastolic arterial pressure and heart rate were measured during 120 min. An increase in arterial pressure was found, and potential roles of the renin-angiotensin system, Na+,K+-ATPase and the autonomic reflexes in this change in the increase of arterial pressure found were evaluated. In anesthetized rats, lead exposure: 1) produced blood lead levels of 37±1.7 µg/dL, which is below the reference blood concentration (60 µg/dL); 2) increased systolic arterial pressure (Ct: 109±3 mmHg vs Pb: 120±4 mmHg); 3) increased ACE activity (27% compared to Ct) and Na+,K+-ATPase activity (125% compared to Ct); and 4) did not change the protein expression of the α1-subunit of Na+,K+-ATPase, AT1 and AT2. Pre-treatment with an AT1 receptor blocker (losartan, 10 mg/Kg) or an ACE inhibitor (enalapril, 5 mg/Kg) blocked the lead-induced increase of arterial pressure. However, a ganglionic blockade (hexamethonium, 20 mg/Kg) did not prevent lead's hypertensive effect. Conclusion Acute exposure to lead below the reference blood concentration increases systolic arterial pressure by increasing angiotensin II levels due to ACE activation. These findings offer further evidence that acute exposure to lead can trigger early mechanisms of hypertension development and might be an environmental risk factor for cardiovascular disease.
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Mechanistic distinction between activation and inhibition of (Na(+)+K(+))-ATPase-mediated Ca2+ influx in cardiomyocytes. Biochem Biophys Res Commun 2011; 406:200-3. [PMID: 21303662 DOI: 10.1016/j.bbrc.2011.02.013] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/20/2011] [Accepted: 02/02/2011] [Indexed: 12/29/2022]
Abstract
(Na(+)+K(+))-ATPase (NKA) mediates positive inotropy in the heart. Extensive studies have demonstrated that the reverse-mode Na(+)/Ca(2+)-exchanger (NCX) plays a critical role in increasing intracellular Ca(2+) concentration through the inhibition of NKA-induced positive inotropy by cardiac glycosides. Little is known about the nature of the NCX functional mode in the activation of NKA-induced positive inotropy. Here, we examined the effect of an NKA activator SSA412 antibody on (45)Ca influx in isolated rat myocytes and found that KB-R7943, a NCX reverse-mode inhibitor, fails to inhibit the activation of NKA-induced (45)Ca influx, suggesting that the Ca(2+) influx via the reverse-mode NCX does not mediate this process. Nifedipine, an L-type Ca(2+) channel (LTCC) inhibitor, completely blocks the activation of NKA-induced (45)Ca influx, suggesting that the LTCC is responsible for the moderate increase in intracellular Ca(2+). In contrast, the inhibition of NKA by ouabain induces 4.7-fold (45)Ca influx compared with the condition of activation of NKA. Moreover, approximately 70% of ouabain-induced (45)Ca influx was obstructed by KB-R7943 and only 30% was impeded by nifedipine, indicating that both the LTCC and the NCX contribute to the rise in intracellular Ca(2+) and that the NCX reverse-mode is the major source for the (45)Ca influx induced by the inhibition of NKA. This study provides direct evidence to demonstrate that the activation of NKA-induced Ca(2+) increase is independent of the reverse-mode NCX and pinpoints a mechanistic distinction between the activation and inhibition of the NKA-mediated Ca(2+) influx path ways in cardiomyocytes.
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20
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Xu KY, Zhu W, Xiao RP. Serine496 of β2 subunit of L-type Ca2+ channel participates in molecular crosstalk between activation of (Na++K+)-ATPase and the channel. Biochem Biophys Res Commun 2010; 402:319-23. [PMID: 20937253 DOI: 10.1016/j.bbrc.2010.10.024] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/02/2010] [Accepted: 10/05/2010] [Indexed: 11/29/2022]
Abstract
Activation of (Na++K+)-ATPase (NKA) regulates cardiac L-type Ca2+ channel (LTCC) function through molecular crosstalk. The mechanism underlying NKA-LTCC crosstalk remains poorly understood. We have previously shown that activation of NKA leads to phosphorylation of LTCC α1 Ser1928. Here we investigated whether LTCC β2 subunit is modulated by NKA activation and found that LTCC β2 Ser496 is phosphorylated in response to activation of NKA. Src inhibitor PP1 and Erk1/2 inhibitor PD98059 abolish LTCC β2 Ser496 phosphorylation, suggesting that NKA-mediated β2 Ser496 phosphorylation is dependent of Src/Erk1/2 signaling pathway. Protein kinase G (PKG) inhibitor KT5823 failed to inhibit the phosphorylation of β2 Ser496, indicating that the NKA-LTCC crosstalk is independent of PKG activity. The results of nifedipine sensitive 45Ca influx experiments suggest that phosphorylation of β2 Ser496 may play a key down-regulation role in attenuating the accelerated activity of α1 subunit of the channel. Ouabain does not cause a phosphorylation on β2 Ser496, indicating a fundamental difference between activation and inhibition of NKA-mediated biological processes. This study provides the first evidence to demonstrate that LTCC β2 subunit is coupled with the movement of signals in the mechanism of activation of NKA-mediated crosstalk with LTCC.
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Affiliation(s)
- Kai Y Xu
- Department of Surgery, Division of Cardiac Surgery, University of Maryland School of Medicine, Baltimore, MD 21201, USA.
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Zheng J, Koh X, Hua F, Li G, Larrick JW, Bian JS. Cardioprotection induced by Na+/K+-ATPase activation involves extracellular signal-regulated kinase 1/2 and phosphoinositide 3-kinase/Akt pathway. Cardiovasc Res 2010; 89:51-9. [DOI: 10.1093/cvr/cvq263] [Citation(s) in RCA: 32] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/21/2023] Open
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Ribeiro Junior RF, Fernandes AA, Meira EF, Batista PR, Siman FDM, Vassallo DV, Padilha AS, Stefanon I. Soybean oil increases SERCA2a expression and left ventricular contractility in rats without change in arterial blood pressure. Lipids Health Dis 2010; 9:53. [PMID: 20504316 PMCID: PMC2894821 DOI: 10.1186/1476-511x-9-53] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/25/2010] [Accepted: 05/26/2010] [Indexed: 01/08/2023] Open
Abstract
Background Our aim was to evaluate the effects of soybean oil treatment for 15 days on arterial and ventricular pressure, myocardial mechanics and proteins involved in calcium handling. Methods Wistar rats were divided in two groups receiving 100 μL of soybean oil (SB) or saline (CT) i.m. for 15 days. Ventricular performance was analyzed in male 12-weeks old Wistar rats by measuring left ventricle diastolic and systolic pressure in isolated perfused hearts according to the Langendorff technique. Protein expression was measured by Western blot analysis. Results Systolic and diastolic arterial pressures did not differ between CT and SB rats. However, heart rate was reduced in the SB group. In the perfused hearts, left ventricular isovolumetric systolic pressure was higher in the SB hearts. The inotropic response to extracellular Ca2+ and isoproterenol was higher in the soybean-treated animals than in the control group. Myosin ATPase and Na+-K+ATPase activities, the expression of sarcoplasmic reticulum calcium pump (SERCA2a) and sodium calcium exchanger (NCX) were increased in the SB group. Although the phosfolamban (PLB) expression did not change, its phosphorylation at Ser16 was reduced while the SERCA2a/PLB ratio was increased. Conclusions In summary, soybean treatment for 15 days in rats increases the left ventricular performance without affecting arterial blood pressure. These changes might be associated with an increase in the myosin ATPase activity and SERCA2a expression.
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