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Silva AR, de Souza e Souza KFC, Souza TBD, Younes-Ibrahim M, Burth P, de Castro Faria Neto HC, Gonçalves-de-Albuquerque CF. The Na/K-ATPase role as a signal transducer in lung inflammation. Front Immunol 2024; 14:1287512. [PMID: 38299144 PMCID: PMC10827986 DOI: 10.3389/fimmu.2023.1287512] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/01/2023] [Accepted: 12/26/2023] [Indexed: 02/02/2024] Open
Abstract
Acute respiratory distress syndrome (ARDS) is marked by damage to the capillary endothelium and alveolar epithelium following edema formation and cell infiltration. Currently, there are no effective treatments for severe ARDS. Pathologies such as sepsis, pneumonia, fat embolism, and severe trauma may cause ARDS with respiratory failure. The primary mechanism of edema clearance is the epithelial cells' Na/K-ATPase (NKA) activity. NKA is an enzyme that maintains the electrochemical gradient and cell homeostasis by transporting Na+ and K+ ions across the cell membrane. Direct injury on alveolar cells or changes in ion transport caused by infections decreases the NKA activity, loosening tight junctions in epithelial cells and causing edema formation. In addition, NKA acts as a receptor triggering signal transduction in response to the binding of cardiac glycosides. The ouabain (a cardiac glycoside) and oleic acid induce lung injury by targeting NKA. Besides enzymatic inhibition, the NKA triggers intracellular signal transduction, fostering proinflammatory cytokines production and contributing to lung injury. Herein, we reviewed and discussed the crucial role of NKA in edema clearance, lung injury, and intracellular signaling pathway activation leading to lung inflammation, thus putting the NKA as a protagonist in lung injury pathology.
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Affiliation(s)
- Adriana Ribeiro Silva
- Laboratório de Imunofarmacologia, Instituto Oswaldo Cruz, Fundação Oswaldo Cruz (FIOCRUZ), Rio de Janeiro, Brazil
| | | | - Thamires Bandeira De Souza
- Laboratório de Imunofarmacologia, Departamento de Ciências Fisiológicas, Universidade Federal do Estado do Rio de Janeiro, Rio de Janeiro, Brazil
- Departamento de Biologia Celular e Molecular, Instituto de Biologia, Universidade Federal Fluminense, Niterói, Brazil
| | - Mauricio Younes-Ibrahim
- Departamento de Medicina Interna, Faculdade de Ciências Médicas, Universidade do Estado do Rio de Janeiro, Rio de Janeiro, Brazil
| | - Patrícia Burth
- Departamento de Biologia Celular e Molecular, Instituto de Biologia, Universidade Federal Fluminense, Niterói, Brazil
| | | | - Cassiano Felippe Gonçalves-de-Albuquerque
- Laboratório de Imunofarmacologia, Instituto Oswaldo Cruz, Fundação Oswaldo Cruz (FIOCRUZ), Rio de Janeiro, Brazil
- Laboratório de Imunofarmacologia, Departamento de Ciências Fisiológicas, Universidade Federal do Estado do Rio de Janeiro, Rio de Janeiro, Brazil
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Li W, Wang Y. Stress granules: potential therapeutic targets for infectious and inflammatory diseases. Front Immunol 2023; 14:1145346. [PMID: 37205103 PMCID: PMC10185834 DOI: 10.3389/fimmu.2023.1145346] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/16/2023] [Accepted: 04/12/2023] [Indexed: 05/21/2023] Open
Abstract
Eukaryotic cells are stimulated by external pressure such as that derived from heat shock, oxidative stress, nutrient deficiencies, or infections, which induce the formation of stress granules (SGs) that facilitates cellular adaptation to environmental pressures. As aggregated products of the translation initiation complex in the cytoplasm, SGs play important roles in cell gene expression and homeostasis. Infection induces SGs formation. Specifically, a pathogen that invades a host cell leverages the host cell translation machinery to complete the pathogen life cycle. In response, the host cell suspends translation, which leads to SGs formation, to resist pathogen invasion. This article reviews the production and function of SGs, the interaction between SGs and pathogens, and the relationship between SGs and pathogen-induced innate immunity to provide directions for further research into anti-infection and anti-inflammatory disease strategies.
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Affiliation(s)
- Wenyuan Li
- Department of Anesthesiology, Renmin Hospital of Wuhan University, Wuhan, Hubei, China
| | - Yao Wang
- Department of Infectious Diseases, Renmin Hospital of Wuhan University, Wuhan, Hubei, China
- *Correspondence: Yao Wang,
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Pterostilbene Attenuates Fructose-Induced Myocardial Fibrosis by Inhibiting ROS-Driven Pitx2c/miR-15b Pathway. OXIDATIVE MEDICINE AND CELLULAR LONGEVITY 2019; 2019:1243215. [PMID: 31871537 PMCID: PMC6913258 DOI: 10.1155/2019/1243215] [Citation(s) in RCA: 23] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 06/05/2019] [Accepted: 11/04/2019] [Indexed: 12/26/2022]
Abstract
Excessive fructose consumption induces oxidative stress and myocardial fibrosis. Antioxidant compound pterostilbene has cardioprotective effect in experimental animals. This study is aimed at investigating how fructose drove fibrotic responses via oxidative stress in cardiomyocytes and explored the attenuation mechanisms of pterostilbene. We observed fructose-induced myocardial hypertrophy and fibrosis with ROS overproduction in rats. Paired-like homeodomain 2 (Pitx2c) increase, microRNA-15b (miR-15b) low expression, and p53 phosphorylation (p-p53) upregulation, as well as activation of transforming growth factor-β1 (TGF-β1)/drosophila mothers against DPP homolog (Smads) signaling and connective tissue growth factor (CTGF) induction, were also detected in fructose-fed rat hearts and fructose-exposed rat myocardial cell line H9c2 cells. The results from p53 siRNA or TGF-β1 siRNA transfection showed that TGF-β1-induced upregulation of CTGF expression and p-p53 activated TGF-β1/Smads signaling in fructose-exposed H9c2 cells. Of note, Pitx2c negatively modulated miR-15b expression via binding to the upstream of the miR-15b genetic loci by chromatin immunoprecipitation and transfection analysis with pEX1-Pitx2c plasmid and Pitx2c siRNA, respectively. In H9c2 cells pretreated with ROS scavenger N-acetylcysteine, or transfected with miR-15b mimic and inhibitor, fructose-induced cardiac ROS overload could drive Pitx2c-mediated miR-15b low expression, then cause p-p53-activated TGF-β1/Smads signaling and CTGF induction in myocardial fibrosis. We also found that pterostilbene significantly improved myocardial hypertrophy and fibrosis in fructose-fed rats and fructose-exposed H9c2 cells. Pterostilbene reduced cardiac ROS to block Pitx2c-mediated miR-15b low expression and p-p53-dependent TGF-β1/Smads signaling activation and CTGF induction in high fructose-induced myocardial fibrosis. These results firstly demonstrated that the ROS-driven Pitx2c/miR-15b pathway was required for p-p53-dependent TGF-β1/Smads signaling activation in fructose-induced myocardial fibrosis. Pterostilbene protected against high fructose-induced myocardial fibrosis through the inhibition of Pitx2c/miR-15b pathway to suppress p-p53-activated TGF-β1/Smads signaling, warranting the consideration of Pitx2c/miR-15b pathway as a therapeutic target in myocardial fibrosis.
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Kennedy DJ, Khalaf FK, Sheehy B, Weber ME, Agatisa-Boyle B, Conic J, Hauser K, Medert CM, Westfall K, Bucur P, Fedorova OV, Bagrov AY, Tang WHW. Telocinobufagin, a Novel Cardiotonic Steroid, Promotes Renal Fibrosis via Na⁺/K⁺-ATPase Profibrotic Signaling Pathways. Int J Mol Sci 2018; 19:ijms19092566. [PMID: 30158457 PMCID: PMC6164831 DOI: 10.3390/ijms19092566] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/09/2018] [Revised: 08/26/2018] [Accepted: 08/27/2018] [Indexed: 12/24/2022] Open
Abstract
Cardiotonic steroids (CTS) are Na+/K+-ATPase (NKA) ligands that are elevated in volume-expanded states and associated with cardiac and renal dysfunction in both clinical and experimental settings. We test the hypothesis that the CTS telocinobufagin (TCB) promotes renal dysfunction in a process involving signaling through the NKA α-1 in the following studies. First, we infuse TCB (4 weeks at 0.1 µg/g/day) or a vehicle into mice expressing wild-type (WT) NKA α-1, as well as mice with a genetic reduction (~40%) of NKA α-1 (NKA α-1+/−). Continuous TCB infusion results in increased proteinuria and cystatin C in WT mice which are significantly attenuated in NKA α-1+/− mice (all p < 0.05), despite similar increases in blood pressure. In a series of in vitro experiments, 24-h treatment of HK2 renal proximal tubular cells with TCB results in significant dose-dependent increases in both Collagens 1 and 3 mRNA (2-fold increases at 10 nM, 5-fold increases at 100 nM, p < 0.05). Similar effects are seen in primary human renal mesangial cells. TCB treatment (100 nM) of SYF fibroblasts reconstituted with cSrc results in a 1.5-fold increase in Collagens 1 and 3 mRNA (p < 0.05), as well as increases in both Transforming Growth factor beta (TGFb, 1.5 fold, p < 0.05) and Connective Tissue Growth Factor (CTGF, 2 fold, p < 0.05), while these effects are absent in SYF cells without Src kinase. In a patient study of subjects with chronic kidney disease, TCB is elevated compared to healthy volunteers. These studies suggest that the pro-fibrotic effects of TCB in the kidney are mediated though the NKA-Src kinase signaling pathway and may have relevance to volume-overloaded conditions, such as chronic kidney disease where TCB is elevated.
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Affiliation(s)
- David J Kennedy
- Department of Medicine, University of Toledo College of Medicine, Toledo, OH 43614, USA.
| | - Fatimah K Khalaf
- Department of Medicine, University of Toledo College of Medicine, Toledo, OH 43614, USA.
| | - Brendan Sheehy
- Department of Cellular and Molecular Medicine, Lerner Research Institute Cleveland Clinic, Cleveland, OH 44106, USA.
| | - Malory E Weber
- Department of Cellular and Molecular Medicine, Lerner Research Institute Cleveland Clinic, Cleveland, OH 44106, USA.
| | - Brendan Agatisa-Boyle
- Department of Cellular and Molecular Medicine, Lerner Research Institute Cleveland Clinic, Cleveland, OH 44106, USA.
| | - Julijana Conic
- Department of Cellular and Molecular Medicine, Lerner Research Institute Cleveland Clinic, Cleveland, OH 44106, USA.
| | - Kayla Hauser
- Department of Cellular and Molecular Medicine, Lerner Research Institute Cleveland Clinic, Cleveland, OH 44106, USA.
| | - Charles M Medert
- Department of Cellular and Molecular Medicine, Lerner Research Institute Cleveland Clinic, Cleveland, OH 44106, USA.
| | - Kristen Westfall
- Department of Cellular and Molecular Medicine, Lerner Research Institute Cleveland Clinic, Cleveland, OH 44106, USA.
| | - Philip Bucur
- Department of Cellular and Molecular Medicine, Lerner Research Institute Cleveland Clinic, Cleveland, OH 44106, USA.
| | - Olga V Fedorova
- Laboratory of Cardiovascular Science, National Institute on Aging, National Institutes of Health, Baltimore, MD 21224, USA.
| | - Alexei Y Bagrov
- Sechenov Institute of Evolutionary Physiology and Biochemistry, St. Petersburg 194223, Russia.
| | - W H Wilson Tang
- Department of Cellular and Molecular Medicine, Lerner Research Institute Cleveland Clinic, Cleveland, OH 44106, USA.
- Center for Cardiovascular Diagnostics and Prevention, Lerner Research Institute Cleveland Clinic, Cleveland, OH 44106, USA.
- Department of Cardiovascular Medicine, Heart and Vascular Institute, Cleveland Clinic, Cleveland, OH 44195, USA.
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5
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Kai W, Yating S, Lin M, Kaiyong Y, Baojin H, Wu Y, Fangzhou Y, Yan C. Natural product toosendanin reverses the resistance of human breast cancer cells to adriamycin as a novel PI3K inhibitor. Biochem Pharmacol 2018; 152:153-164. [DOI: 10.1016/j.bcp.2018.03.022] [Citation(s) in RCA: 31] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/01/2017] [Accepted: 03/20/2018] [Indexed: 11/16/2022]
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Wong RW, Lingwood CA, Ostrowski MA, Cabral T, Cochrane A. Cardiac glycoside/aglycones inhibit HIV-1 gene expression by a mechanism requiring MEK1/2-ERK1/2 signaling. Sci Rep 2018; 8:850. [PMID: 29339801 PMCID: PMC5770468 DOI: 10.1038/s41598-018-19298-x] [Citation(s) in RCA: 33] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/14/2017] [Accepted: 11/07/2017] [Indexed: 12/14/2022] Open
Abstract
The capacity of HIV-1 to develop resistance to current drugs calls for innovative strategies to control this infection. We aimed at developing novel inhibitors of HIV-1 replication by targeting viral RNA processing—a stage dependent on conserved host processes. We previously reported that digoxin is a potent inhibitor of this stage. Herein, we identify 12 other cardiac glycoside/aglycones or cardiotonic steroids (CSs) that impede HIV growth in HIV-infected T cells from clinical patients at IC50s (1.1–1.3 nM) that are 2–26 times below concentrations used in patients with heart conditions. We subsequently demonstrate that CSs inhibit HIV-1 gene expression in part through modulation of MEK1/2-ERK1/2 signaling via interaction with the Na+/K+-ATPase, independent of alterations in intracellular Ca2+. Supporting this hypothesis, depletion of the Na+/K+-ATPase or addition of a MEK1/2-ERK1/2 activator also impairs HIV-1 gene expression. Similar to digoxin, all CSs tested induce oversplicing of HIV-1 RNAs, reducing unspliced (Gag) and singly spliced RNAs (Env/p14-Tat) encoding essential HIV-1 structural/regulatory proteins. Furthermore, all CSs cause nuclear retention of genomic/unspliced RNAs, supporting viral RNA processing as the underlying mechanism for their disruption of HIV-1 replication. These findings call for further in vivo validation and supports the targeting of cellular processes to control HIV-1 infection.
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Affiliation(s)
- Raymond W Wong
- Department of Laboratory Medicine and Pathobiology, University of Toronto, Toronto, ON, M5S1A8, Canada
| | - Clifford A Lingwood
- Department of Laboratory Medicine and Pathobiology, University of Toronto, Toronto, ON, M5S1A8, Canada.,Division of Molecular Structure and Function, Hospital for Sick Children, Toronto, ON, M5G1X8, Canada.,Department of Biochemistry, University of Toronto, Toronto, Ontario, M5S1A8, Canada
| | - Mario A Ostrowski
- Keenan Research Centre for Biomedical Science of St. Michael's Hospital Toronto, Toronto, ON, M5B1W8, Canada.,Department of Medicine, University of Toronto, Toronto, Ontario, M5S1A8, Canada.,Department of Immunology, University of Toronto, Toronto, ON, M5S1A8, Canada.,Institute of Medical Science, University of Toronto, Toronto, ON, M5S1A8, Canada
| | - Tyler Cabral
- Department of Molecular Genetics, University of Toronto, Toronto, ON, M5S1A8, Canada
| | - Alan Cochrane
- Institute of Medical Science, University of Toronto, Toronto, ON, M5S1A8, Canada. .,Department of Molecular Genetics, University of Toronto, Toronto, ON, M5S1A8, Canada.
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7
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Cavalcante-Silva LHA, Lima ÉDA, Carvalho DCM, de Sales-Neto JM, Alves AKDA, Galvão JGFM, da Silva JSDF, Rodrigues-Mascarenhas S. Much More than a Cardiotonic Steroid: Modulation of Inflammation by Ouabain. Front Physiol 2017; 8:895. [PMID: 29176951 PMCID: PMC5686084 DOI: 10.3389/fphys.2017.00895] [Citation(s) in RCA: 34] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/06/2017] [Accepted: 10/24/2017] [Indexed: 12/22/2022] Open
Abstract
Since the discovery of ouabain as a cardiotonic steroid hormone present in higher mammals, research about it has progressed rapidly and several of its physiological and pharmacological effects have been described. Ouabain can behave as a stress hormone and adrenal cortex is its main source. Direct effects of ouabain are originated due to the binding to its receptor, the Na+/K+-ATPase, on target cells. This interaction can promote Na+ transport blockade or even activation of signaling transduction pathways (e.g., EGFR/Src-Ras-ERK pathway activation), independent of ion transport. Besides the well-known effect of ouabain on the cardiovascular system and blood pressure control, compelling evidence indicates that ouabain regulates a number of immune functions. Inflammation is a tightly coordinated immunological function that is also affected by ouabain. Indeed, this hormone can modulate many inflammatory events such as cell migration, vascular permeability, and cytokine production. Moreover, ouabain also interferes on neuroinflammation. However, it is not clear how ouabain controls these events. In this brief review, we summarize the updates of ouabain effect on several aspects of peripheral and central inflammation, bringing new insights into ouabain functions on the immune system.
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Affiliation(s)
- Luiz H A Cavalcante-Silva
- Programa de Pós-Graduação em Produtos Naturais e Sintéticos Bioativos, Laboratório de Imunobiotecnologia, Centro de Ciências da Saúde, Universidade Federal da Paraíba, João Pessoa, Brazil
| | - Éssia de Almeida Lima
- Programa de Pós-Graduação em Biotecnologia, Laboratório de Imunobiotecnologia, Centro de Biotecnologia, Universidade Federal da Paraíba, João Pessoa, Brazil
| | - Deyse C M Carvalho
- Programa Multicêntrico de Pós-graduação em Ciências Fisiológicas, Laboratório de Imunobiotecnologia, Centro de Biotecnologia, Universidade Federal da Paraíba, João Pessoa, Brazil
| | - José M de Sales-Neto
- Programa de Pós-Graduação em Produtos Naturais e Sintéticos Bioativos, Laboratório de Imunobiotecnologia, Centro de Ciências da Saúde, Universidade Federal da Paraíba, João Pessoa, Brazil
| | - Anne K de Abreu Alves
- Programa de Pós-Graduação em Biotecnologia, Laboratório de Imunobiotecnologia, Centro de Biotecnologia, Universidade Federal da Paraíba, João Pessoa, Brazil
| | - José G F M Galvão
- Programa de Pós-Graduação em Produtos Naturais e Sintéticos Bioativos, Laboratório de Imunobiotecnologia, Centro de Ciências da Saúde, Universidade Federal da Paraíba, João Pessoa, Brazil
| | - Juliane S de França da Silva
- Programa de Pós-Graduação em Produtos Naturais e Sintéticos Bioativos, Laboratório de Imunobiotecnologia, Centro de Ciências da Saúde, Universidade Federal da Paraíba, João Pessoa, Brazil
| | - Sandra Rodrigues-Mascarenhas
- Programa de Pós-Graduação em Produtos Naturais e Sintéticos Bioativos, Laboratório de Imunobiotecnologia, Centro de Ciências da Saúde, Universidade Federal da Paraíba, João Pessoa, Brazil.,Programa de Pós-Graduação em Biotecnologia, Laboratório de Imunobiotecnologia, Centro de Biotecnologia, Universidade Federal da Paraíba, João Pessoa, Brazil.,Programa Multicêntrico de Pós-graduação em Ciências Fisiológicas, Laboratório de Imunobiotecnologia, Centro de Biotecnologia, Universidade Federal da Paraíba, João Pessoa, Brazil
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8
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Dan C, Jinjun B, Zi-Chun H, Lin M, Wei C, Xu Z, Ri Z, Shun C, Wen-Zhu S, Qing-Cai J, Wu Y. Modulation of TNF-α mRNA stability by human antigen R and miR181s in sepsis-induced immunoparalysis. EMBO Mol Med 2015; 7:140-57. [PMID: 25535255 PMCID: PMC4328645 DOI: 10.15252/emmm.201404797] [Citation(s) in RCA: 57] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022] Open
Abstract
Immunoparalysis is an important pathological mechanism in sepsis. However, an effective small molecule therapy is lacking. Here, we show that ouabain, a Na+,K+-ATPase ligand, can reverse immunoparalysis in vitro, in vivo, and in clinical samples. Notably, the effect of ouabain was critically dependent on TNF-α expression. However, ouabain had opposing effects on the stability of TNF-α mRNA: Ouabain triggered miR-181 transcription, which promoted TNF-α mRNA degradation and induced immunoparalysis, and ouabain triggered the nuclear export of human antigen R (HuR), which stabilized TNF-α mRNA and suppressed immuno-paralysis. Interestingly, because the miR-181 binding site is located within the HuR binding site in the 3′-untranslated region of TNF-α, in ouabain-treated cells, HuR competed with miR-181 for binding to TNF-α mRNA and recruited TNF-α mRNA to stress granules, thereby stabilizing TNF-α mRNA and reversing immunoparalysis. Ouabain also induced GM-CSF and interferon-γ expression in a HuR-dependent manner. Hence, the fine-tuning of TNF-α mRNA stability by HuR and miR181 plays a crucial role in immunoparalysis, and Na+,K+-ATPase ligands are promising agents for immunoparalysis therapy.
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Affiliation(s)
- Cao Dan
- The State Key Lab of Pharmaceutical Biotechnology, College of life Sciences Nanjing University, Nanjing, China
| | - Bian Jinjun
- Department of Anesthesiology and Intensive Care Unit, Changhai Hospital Affiliated Hospital of the Second Military Medical University, Shanghai, China
| | - Hua Zi-Chun
- The State Key Lab of Pharmaceutical Biotechnology, College of life Sciences Nanjing University, Nanjing, China
| | - Ma Lin
- The State Key Lab of Pharmaceutical Biotechnology, College of life Sciences Nanjing University, Nanjing, China
| | - Chen Wei
- The State Key Lab of Pharmaceutical Biotechnology, College of life Sciences Nanjing University, Nanjing, China
| | - Zhang Xu
- Department of Anesthesiology and Intensive Care Unit, Changhai Hospital Affiliated Hospital of the Second Military Medical University, Shanghai, China
| | - Zhou Ri
- The State Key Lab of Pharmaceutical Biotechnology, College of life Sciences Nanjing University, Nanjing, China
| | - Cheng Shun
- The State Key Lab of Pharmaceutical Biotechnology, College of life Sciences Nanjing University, Nanjing, China
| | - Sun Wen-Zhu
- The State Key Lab of Pharmaceutical Biotechnology, College of life Sciences Nanjing University, Nanjing, China
| | - Jiao Qing-Cai
- The State Key Lab of Pharmaceutical Biotechnology, College of life Sciences Nanjing University, Nanjing, China
| | - Yin Wu
- The State Key Lab of Pharmaceutical Biotechnology, College of life Sciences Nanjing University, Nanjing, China The State Key Lab of Natural Medicine, China Pharmaceutical University, Nanjing, China Jiangsu Key Lab of Pediatric Respiratory Disease, Nanjing University of Chinese Medicine, Nanjing, China
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Wei C, Lin M, Jinjun B, Su F, Dan C, Yan C, Jie Y, Jin Z, Zi-Chun H, Wu Y. Involvement of general control nonderepressible kinase 2 in cancer cell apoptosis by posttranslational mechanisms. Mol Biol Cell 2015; 26:1044-57. [PMID: 25589675 PMCID: PMC4357505 DOI: 10.1091/mbc.e14-10-1438] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/14/2023] Open
Abstract
GCN2 exerts its proapoptotic function in cancer cell death by posttranslational mechanisms. Modulation of GCN2 expression can be used for molecular targeted cancer therapy and drug development. Na+,K+-ATPase ligands are the first identified small-molecule drugs that can trigger cancer cell death by modulating GCN2 signaling. General control nonderepressible kinase 2 (GCN2) is a promising target for cancer therapy. However, the role of GCN2 in cancer cell survival or death is elusive; further, small molecules targeting GCN2 signaling are not available. By using a GCN2 level-based drug screening assay, we found that GCN2 protein level critically determined the sensitivity of the cancer cells toward Na+,K+-ATPase ligand–induced apoptosis both in vitro and in vivo, and this effect was largely dependent on C/EBP homologous protein (CHOP) induction. Further analysis revealed that GCN2 is a short-lived protein. In A549 lung carcinoma cells, cellular β-arrestin1/2 associated with GCN2 and maintained the GCN2 protein level at a low level by recruiting the E3 ligase NEDD4L and facilitating consequent proteasomal degradation. However, Na+,K+-ATPase ligand treatment triggered the phosphorylation of GCN2 at threonine 899, which increased the GCN2 protein level by disrupting the formation of GCN2–β-arrestin–NEDD4L ternary complex. The enhanced GCN2 level, in turn, aggravated Na+,K+-ATPase ligand–induced cancer cell apoptosis. Our findings reveal that GCN2 can exert its proapoptotic function in cancer cell death by posttranslational mechanisms. Moreover, Na+,K+-ATPase ligands emerge as the first identified small-molecule drugs that can trigger cancer cell death by modulating GCN2 signaling.
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Affiliation(s)
- Chen Wei
- State Key Lab of Pharmaceutical Biotechnology, College of Life Sciences, Nanjing University, Nanjing 210093, China State Key Lab of Natural Medicines, China Pharmaceutical University, Nanjing 210017, China
| | - Ma Lin
- State Key Lab of Pharmaceutical Biotechnology, College of Life Sciences, Nanjing University, Nanjing 210093, China
| | - Bian Jinjun
- Department of Anaesthesiology and Intensive Care Unit, Changhai Hospital, Affiliated Hospital of the Second Military Medical University, Shanghai 200433, China
| | - Feng Su
- State Key Lab of Pharmaceutical Biotechnology, College of Life Sciences, Nanjing University, Nanjing 210093, China
| | - Cao Dan
- State Key Lab of Pharmaceutical Biotechnology, College of Life Sciences, Nanjing University, Nanjing 210093, China
| | - Chen Yan
- Department of Chinese Medicine, Jiangsu Cancer Hospital, Nanjing 210009, China
| | - Yang Jie
- State Key Lab of Pharmaceutical Biotechnology, College of Life Sciences, Nanjing University, Nanjing 210093, China
| | - Zhang Jin
- State Key Lab of Pharmaceutical Biotechnology, College of Life Sciences, Nanjing University, Nanjing 210093, China
| | - Hua Zi-Chun
- State Key Lab of Pharmaceutical Biotechnology, College of Life Sciences, Nanjing University, Nanjing 210093, China State Key Lab of Natural Medicines, China Pharmaceutical University, Nanjing 210017, China
| | - Yin Wu
- State Key Lab of Pharmaceutical Biotechnology, College of Life Sciences, Nanjing University, Nanjing 210093, China State Key Lab of Natural Medicines, China Pharmaceutical University, Nanjing 210017, China
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10
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Gonçalves-de-Albuquerque CF, Burth P, Silva AR, de Moraes IMM, Oliveira FMDJ, Santelli RE, Freire AS, de Lima GS, da Silva ED, da Silva CI, Morandi V, Bozza PT, Younes-Ibrahim M, de Castro Faria Neto HC, de Castro Faria MV. Murine lung injury caused by Leptospira interrogans glycolipoprotein, a specific Na/K-ATPase inhibitor. Respir Res 2014; 15:93. [PMID: 25265888 PMCID: PMC4151191 DOI: 10.1186/s12931-014-0093-2] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/19/2014] [Accepted: 07/31/2014] [Indexed: 12/15/2022] Open
Abstract
Background Leptospiral glycolipoprotein (GLP) is a potent and specific Na/K-ATPase inhibitor. Severe pulmonary form of leptospirosis is characterized by edema, inflammation and intra-alveolar hemorrhage having a dismal prognosis. Resolution of edema and inflammation determines the outcome of lung injury. Na/K-ATPase activity is responsible for edema clearance. This enzyme works as a cell receptor that triggers activation of mitogen-activated protein kinase (MAPK) intracellular signaling pathway. Therefore, injection of GLP into lungs induces injury by triggering inflammation. Methods We injected GLP and ouabain, into mice lungs and compared their effects. Bronchoalveolar lavage fluid (BALF) was collected for cell and lipid body counting and measurement of protein and lipid mediators (PGE2 and LTB4). The levels of the IL-6, TNFα, IL-1B and MIP-1α were also quantified. Lung images illustrate the injury and whole-body plethysmography was performed to assay lung function. We used Toll-like receptor 4 (TLR4) knockout mice to evaluate leptospiral GLP-induced lung injury. Na/K-ATPase activity was determined in lung cells by nonradioactive rubidium incorporation. We analyzed MAPK p38 activation in lung and in epithelial and endothelial cells. Results Leptospiral GLP and ouabain induced lung edema, cell migration and activation, production of lipid mediators and cytokines and hemorrhage. They induced lung function alterations and inhibited rubidium incorporation. Using TLR4 knockout mice, we showed that the GLP action was not dependent on TLR4 activation. GLP activated of p38 and enhanced cytokine production in cell cultures which was reversed by a selective p38 inhibitor. Conclusions GLP and ouabain induced lung injury, as evidenced by increased lung inflammation and hemorrhage. To our knowledge, this is the first report showing GLP induces lung injury. GLP and ouabain are Na/K-ATPase targets, triggering intracellular signaling pathways. We showed p38 activation by GLP-induced lung injury, which was may be linked to Na/K-ATPase inhibition. Lung inflammation induced by GLP was not dependent on TLR4 activation.
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Ribosomal alteration-derived signals for cytokine induction in mucosal and systemic inflammation: noncanonical pathways by ribosomal inactivation. Mediators Inflamm 2014; 2014:708193. [PMID: 24523573 PMCID: PMC3910075 DOI: 10.1155/2014/708193] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/14/2013] [Accepted: 11/22/2013] [Indexed: 12/30/2022] Open
Abstract
Ribosomal inactivation damages 28S ribosomal RNA by interfering with its functioning during gene translation, leading to stress responses linked to a variety of inflammatory disease processes. Although the primary effect of ribosomal inactivation in cells is the functional inhibition of global protein synthesis, early responsive gene products including proinflammatory cytokines are exclusively induced by toxic stress in highly dividing tissues such as lymphoid tissue and epithelia. In the present study, ribosomal inactivation-related modulation of cytokine production was reviewed in leukocyte and epithelial pathogenesis models to characterize mechanistic evidence of ribosome-derived cytokine induction and its implications for potent therapeutic targets of mucosal and systemic inflammatory illness, particularly those triggered by organellar dysfunctions.
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Park SH, Moon Y. Integrated stress response-altered pro-inflammatory signals in mucosal immune-related cells. Immunopharmacol Immunotoxicol 2012; 35:205-14. [PMID: 23237490 DOI: 10.3109/08923973.2012.742535] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
Abstract
Various cells are associated with the integrated stress response (ISR) that leads to translation arrest via phosphorylation of the alpha subunit of eukaryotic translation initiation factor 2. Pathogenic insults or nutritional imbalance in the mucosal tissues including the intestinal, airway, and genitourinary epithelia can cause ISRs, which have been linked to different mucosal inflammatory responses and subsequent systemic diseases. In particular, translational arrest caused by the early recognition of luminal microbes as well as nutritional status allows the human body to mount appropriate responses and maintain homeostasis both at the cellular and systemic levels. However, an over- or reduced ISR can create pathogenic conditions such as inflammation and carcinogenesis. This present review explores the association between eIF2α kinase-linked pathways and mucosal or systemic pro-inflammatory signals activated by xenobiotic insults (such as ones caused by microbes or nutritional abnormalities). Understanding ISR-modulated cellular alterations will provide progressive insights into approaches for treating human mucosal inflammatory and metabolic disorders.
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Affiliation(s)
- Seong-Hwan Park
- Laboratory of Mucosal Exposome and Biomodulation, Department of Microbiology and Immunology, Pusan National University School of Medicine, Yangsan, South Korea
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