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He Y, Zhu R, Cai Y, Zhang Y, Zhang Y, Pan S, Schneider RJ, Zhang Y. Transcriptomics and protein biomarkers reveal the detoxifying mechanisms of UV radiation for nebivolol toward zebrafish (Danio rerio) embryos/larvae. AQUATIC TOXICOLOGY (AMSTERDAM, NETHERLANDS) 2022; 249:106241. [PMID: 35868139 DOI: 10.1016/j.aquatox.2022.106241] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/11/2021] [Revised: 06/20/2022] [Accepted: 07/11/2022] [Indexed: 06/15/2023]
Abstract
Nebivolol (NEB), a β-blocker frequently used to treat cardiovascular diseases, has been widely detected in aquatic environments, and can be degraded under exposure to UV radiation, leading to the formation of certain transformation products (UV-TPs). Thus, the toxic effects of NEB and its UV-TPs on aquatic organisms are of great importance for aquatic ecosystems. In the present study, the degradation pathway of NEB under UV radiation was investigated. Subsequently, zebrafish embryos/larvae were used to assess the median lethal concentration (LC50) of NEB, and to clarify the sub-lethal effects of NEB and its UV-TPs for the first time. It was found that UV radiation could reduce the toxic effects of NEB on the early development of zebrafish. Transcriptomic analysis identified the top 20 enriched Kyoto Encyclopedia of Genes and Genomes (KEGG) pathways in zebrafish larvae exposed to NEB, most of which were associated with the antioxidant, nervous, and immune systems. The number of differentially expressed genes (DEGs) in the pathways were reduced after UV radiation. Furthermore, the analysis of protein biomarkers, including CAT and GST (antioxidant response), AChE and ACh (neurotoxicity), CRP and LYS (immune response), revealed that NEB exposure reduced the activity of these biomarkers, whereas UV radiation could alleviate the effects. The present study provides initial insights into the mechanisms underlying toxic effects of NEB and the detoxification effects of UV radiation on the early development of zebrafish. It highlights the necessity of considering the toxicity of UV-TPs when evaluating the toxicity of emerging pollutants in aquatic systems.
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Affiliation(s)
- Yide He
- School of Environmental Science and Engineering, Nanjing Tech University, Nanjing 211800, PR China.
| | - Rongwen Zhu
- School of Environmental Science and Engineering, Nanjing Tech University, Nanjing 211800, PR China
| | - Yujie Cai
- School of Environmental Science and Engineering, Nanjing Tech University, Nanjing 211800, PR China
| | - Yiqun Zhang
- School of Environmental Science and Engineering, Nanjing Tech University, Nanjing 211800, PR China
| | - Yunhai Zhang
- School of Environmental Science and Engineering, Nanjing Tech University, Nanjing 211800, PR China
| | - Shunlong Pan
- School of Environmental Science and Engineering, Nanjing Tech University, Nanjing 211800, PR China
| | - Rudolf J Schneider
- BAM Federal Institute for Materials Research and Testing, Richard-Willstaetter -Str. 11, Berlin D-12489, Germany
| | - Yongjun Zhang
- School of Environmental Science and Engineering, Nanjing Tech University, Nanjing 211800, PR China.
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Packer M. Autophagy-dependent and -independent modulation of oxidative and organellar stress in the diabetic heart by glucose-lowering drugs. Cardiovasc Diabetol 2020; 19:62. [PMID: 32404204 PMCID: PMC7222526 DOI: 10.1186/s12933-020-01041-4] [Citation(s) in RCA: 57] [Impact Index Per Article: 14.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/31/2019] [Accepted: 05/09/2020] [Indexed: 02/07/2023] Open
Abstract
Autophagy is a lysosome-dependent intracellular degradative pathway, which mediates the cellular adaptation to nutrient and oxygen depletion as well as to oxidative and endoplasmic reticulum stress. The molecular mechanisms that stimulate autophagy include the activation of energy deprivation sensors, sirtuin-1 (SIRT1) and adenosine monophosphate-activated protein kinase (AMPK). These enzymes not only promote organellar integrity directly, but they also enhance autophagic flux, which leads to the removal of dysfunctional mitochondria and peroxisomes. Type 2 diabetes is characterized by suppression of SIRT1 and AMPK signaling as well as an impairment of autophagy; these derangements contribute to an increase in oxidative stress and the development of cardiomyopathy. Antihyperglycemic drugs that signal through insulin may further suppress autophagy and worsen heart failure. In contrast, metformin and SGLT2 inhibitors activate SIRT1 and/or AMPK and promote autophagic flux to varying degrees in cardiomyocytes, which may explain their benefits in experimental cardiomyopathy. However, metformin and SGLT2 inhibitors differ meaningfully in the molecular mechanisms that underlie their effects on the heart. Whereas metformin primarily acts as an agonist of AMPK, SGLT2 inhibitors induce a fasting-like state that is accompanied by ketogenesis, a biomarker of enhanced SIRT1 signaling. Preferential SIRT1 activation may also explain the ability of SGLT2 inhibitors to stimulate erythropoiesis and reduce uric acid (a biomarker of oxidative stress)—effects that are not seen with metformin. Changes in both hematocrit and serum urate are the most important predictors of the ability of SGLT2 inhibitors to reduce the risk of cardiovascular death and hospitalization for heart failure in large-scale trials. Metformin and SGLT2 inhibitors may also differ in their ability to mitigate diabetes-related increases in intracellular sodium concentration and its adverse effects on mitochondrial functional integrity. Differences in the actions of SGLT2 inhibitors and metformin may reflect the distinctive molecular pathways that explain differences in the cardioprotective effects of these drugs.
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Affiliation(s)
- Milton Packer
- Baylor Heart and Vascular Institute, Baylor University Medical Center, 621 N. Hall Street, Dallas, TX, 75226, USA. .,Imperial College, London, UK.
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Jewhurst K, McLaughlin KA. Recovery of the Xenopus laevis heart from ROS-induced stress utilizes conserved pathways of cardiac regeneration. Dev Growth Differ 2019; 61:212-227. [PMID: 30924142 DOI: 10.1111/dgd.12602] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/29/2018] [Revised: 01/31/2019] [Accepted: 02/12/2019] [Indexed: 01/22/2023]
Abstract
Urodele amphibians and some fish are capable of regenerating up to a quarter of their heart tissue after cardiac injury. While many anuran amphibians like Xenopus laevis are not capable of such feats, they are able to repair lesser levels of cardiac damage, such as that caused by oxidative stress, to a far greater degree than mammals. Using an optogenetic stress induction model that utilizes the protein KillerRed, we have investigated the extent to which mechanisms of cardiac regeneration are conserved during the restoration of normal heart morphology post oxidative stress in X. laevis tadpoles. We focused particularly on the processes of cardiomyocyte proliferation and dedifferentiation, as well as the pathways that facilitate the regulation of these processes. The cardiac response to KillerRed-induced injury in X. laevis tadpole hearts consists of a phase dominated by indicators of cardiac stress, followed by a repair-like phase with characteristics similar to mechanisms of cardiac regeneration in urodeles and fish. In the latter phase, we found markers associated with partial dedifferentiation and cardiomyocyte proliferation in the injured tadpole heart, which, unlike in regenerating hearts, are not dependent on Notch or retinoic acid signaling. Ultimately, the X. laevis cardiac response to KillerRed-induced oxidative stress shares characteristics with both mammalian and urodele/fish repair mechanisms, but is nonetheless a unique form of recovery, occupying an intermediate place on the spectrum of cardiac regenerative ability. An understanding of how Xenopus repairs cardiac damage can help bridge the gap between mammals and urodeles and contribute to new methods of treating heart disease.
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Affiliation(s)
- Kyle Jewhurst
- Department of Biology, Allen Discovery Center at Tufts University, Medford, Massachusetts
| | - Kelly A McLaughlin
- Department of Biology, Allen Discovery Center at Tufts University, Medford, Massachusetts
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Cheng CI, Lee YH, Chen PH, Lin YC, Chou MH, Kao YH. Cobalt chloride induces RhoA/ROCK activation and remodeling effect in H9c2 cardiomyoblasts: Involvement of PI3K/Akt and MAPK pathways. Cell Signal 2017; 36:25-33. [PMID: 28435089 DOI: 10.1016/j.cellsig.2017.04.013] [Citation(s) in RCA: 25] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/10/2017] [Revised: 04/07/2017] [Accepted: 04/17/2017] [Indexed: 12/12/2022]
Abstract
Chronic heart failure is a serious complication of myocardial infarction, one of the major causes of death worldwide that often leads to adverse cardiac hypertrophy and poor prognosis. Hypoxia-induced cardiac tissue remodeling is considered an important underlying etiology. This study aimed to delineate the signaling profiles of RhoA/ROCK, PI3K/Akt, and MAPK and their involvement in regulation of remodeling events in cultured H9c2 cardiomyoblast cells. In addition to its growth-suppressive effect, the hypoxia-mimetic chemical, cobalt chloride (CoCl2) significantly induced RhoA kinase activation as revealed by increased MBS phosphorylation and ROCK1/2 expression in H9c2 cells. CoCl2 treatment up-regulated type I collagen and MMP-9, but did not affect MMP-2, implicating its role in tissue remodeling. Kinetic signal profiling study showed that CoCl2 also elicited Smad2 hyperphosphorylation and its nuclear translocation in the absence of TGF-β1. In addition, CoCl2 activated Akt-, ERK1/2-, JNK-, and p38 MAPK-mediated signaling pathways. Kinase inhibition experiments demonstrated that hydroxyfasudil, a RhoA kinase inhibitor, significantly blocked the CoCl2- and lysophosphatidic acid-evoked Smad2 phosphorylation and overexpression of type I collagen and MMP-9, and that PI3K and ERK interplayed with RhoA and its downstream Smad2 signaling cascade. In conclusion, this study demonstrated that RhoA/ROCK, PI3K/Akt, and MAPK pathways are mechanistically involved in the CoCl2-stimulated tissue remodeling in H9c2 cardiomyoblast cells. Targeting signaling mediators might be used to mitigate hypoxia-related Smad2 phosphorylation and cardiac remodeling events in ischemic cardiomyopathy.
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Affiliation(s)
- Cheng-I Cheng
- Division of Cardiology, Department of Internal Medicine, Kaohsiung Chang-Gung Memorial Hospital and Chang Gung University College of Medicine, Kaohsiung, Taiwan.
| | - Yueh-Hong Lee
- Division of Cardiology, Department of Internal Medicine, Kaohsiung Chang-Gung Memorial Hospital and Chang Gung University College of Medicine, Kaohsiung, Taiwan
| | - Po-Han Chen
- Department of Medical Research, E-Da Hospital, I-Shou University, Kaohsiung, Taiwan
| | - Yu-Chun Lin
- Department of Medical Research, E-Da Hospital, I-Shou University, Kaohsiung, Taiwan
| | - Ming-Huei Chou
- Graduate Institute of Clinical Medical Sciences, Chang Gung University College of Medicine, Kaohsiung, Taiwan
| | - Ying-Hsien Kao
- Department of Medical Research, E-Da Hospital, I-Shou University, Kaohsiung, Taiwan.
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Jewhurst K, McLaughlin KA. Beyond the Mammalian Heart: Fish and Amphibians as a Model for Cardiac Repair and Regeneration. J Dev Biol 2015; 4:jdb4010001. [PMID: 29615574 PMCID: PMC5831815 DOI: 10.3390/jdb4010001] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/02/2015] [Revised: 12/04/2015] [Accepted: 12/17/2015] [Indexed: 12/12/2022] Open
Abstract
The epidemic of heart disease, the leading cause of death worldwide, is made worse by the fact that the adult mammalian heart is especially poor at repair. Damage to the mammal heart-such as that caused by myocardial infarction-leads to scarring, resulting in cardiac dysfunction and heart failure. In contrast, the hearts of fish and urodele amphibians are capable of complete regeneration of cardiac tissue from multiple types of damage, with full restoration of functionality. In the last decades, research has revealed a wealth of information on how these animals are able to perform this remarkable feat, and non-mammalian models of heart repair have become a burgeoning new source of data on the morphological, cellular, and molecular processes necessary to heal cardiac damage. In this review we present the major findings from recent research on the underlying mechanisms of fish and amphibian heart regeneration. We also discuss the tools and techniques that have been developed to answer these important questions.
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Affiliation(s)
- Kyle Jewhurst
- Department of Biology, Tufts University, Medford, MA 02155, USA.
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Nilsson GE, Vaage J, Stensløkken KO. Oxygen- and temperature-dependent expression of survival protein kinases in crucian carp (Carassius carassius) heart and brain. Am J Physiol Regul Integr Comp Physiol 2015; 308:R50-61. [PMID: 25377478 DOI: 10.1152/ajpregu.00094.2014] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/02/2023]
Abstract
Living without oxygen is limited to very few vertebrates, one species being the fresh water fish crucian carp (Carassius carassius), which can survive months of anoxia at low temperatures. Mammalian heart and brain are particularly intolerant to oxygen deprivation, yet these organs can be conditioned to display increased resistance, possibly due to activation of several protein kinases. We hypothesized increased phosphorylation status of these kinases in hypoxic and anoxic crucian carp heart and brain. Moreover, we wanted to investigate whether the kinases showing the strongest phosphorylation during hypoxia/anoxia, ERK 1/2, p38-MAPK, JNK, PKCε, and PKCδ, also had increased expression and phosphorylation at cold temperatures, to better cope with the anoxic periods during winter. We found small differences in the phosphorylation status of ERK 1/2, p38-MAPK, JNK, PKCε, and PKCδ during 10 days of severe hypoxia in both heart and brain (0.3 mg O₂/l) and varying responses to reoxygenation. In contrast, 7 days of anoxia (<0.01 mg O₂/l) markedly increased phosphorylation of ERK 1/2, p38-MAPK, JNK in the heart, and p38-MAPK and PKCε in the brain. Similarly, varying acclimation temperature between 4, 10 and 20°C induced large changes in phosphorylation status. Total protein expression in heart and brain neither changed during different oxygen regimes nor with different acclimation temperatures, except for ERK 1/2, which slightly decreased in the heart at 4°C compared with 20°C. A phylogenetic analysis confirmed that these protein kinases are evolutionarily conserved across a wide range of vertebrate species. Our findings indicate important roles of several protein kinases during oxygen deprivation.
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Affiliation(s)
- Göran E Nilsson
- Section for Physiology and Cell Biology, Department of Biosciences, University of Oslo, Oslo, Norway
| | - Jarle Vaage
- Department of Emergency Medicine and Intensive Care, Oslo University Hospital and Institute of Clinical Medicine, University of Oslo Hospital, Oslo, Norway; and
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Aggeli IK, Zacharias T, Papapavlou G, Gaitanaki C, Beis I. Calcium paradox induces apoptosis in the isolated perfused Rana ridibunda heart: involvement of p38-MAPK and calpain. Can J Physiol Pharmacol 2013; 91:1095-106. [DOI: 10.1139/cjpp-2013-0081] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
“Calcium paradox” as a term describes the deleterious effects conferred to a heart perfused with a calcium-free solution followed by repletion, including loss of mechanical activity and sarcomere disruption. Given that the signaling mechanisms triggered by calcium paradox remain elusive, in the present study, we tried to investigate them in the isolated perfused heart from Rana ridibunda. Calcium paradox was found to markedly activate members of the MAPKs (p43-ERK, JNKs, p38-MAPK). In addition to lactate dehydrogenase (LDH) release in the perfusate (indicative of necrosis), we also confirmed the occurrence of apoptosis by using the TUNEL assay and identifying poly(ADP-ribose) polymerase (PARP) fragmentation and upregulated Bax expression. Furthermore, using MDL28170 (a selective calpain inhibitor), a role for this protease was revealed. In addition, various divalent cations were shown to exert a protective effect against the calcium paradox. Interestingly, SB203580, a p38-MAPK inhibitor, alleviated calcium-paradox-conferred apoptosis. This result indicates that p38-MAPK plays a pro-apoptotic role, contributing to the resulting myocardial dysfunction and cell death. To our knowledge, this is the first time that the calcium paradox has been shown to induce apoptosis in amphibians, with p38-MAPK and calpain playing significant roles.
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Affiliation(s)
- Ioanna-Katerina Aggeli
- Department of Animal and Human Physiology, School of Biology, University of Athens, University campus, Athens, 157 84, Greece
| | - Triantafyllos Zacharias
- Department of Animal and Human Physiology, School of Biology, University of Athens, University campus, Athens, 157 84, Greece
| | - Georgia Papapavlou
- Department of Animal and Human Physiology, School of Biology, University of Athens, University campus, Athens, 157 84, Greece
| | - Catherine Gaitanaki
- Department of Animal and Human Physiology, School of Biology, University of Athens, University campus, Athens, 157 84, Greece
| | - Isidoros Beis
- Department of Animal and Human Physiology, School of Biology, University of Athens, University campus, Athens, 157 84, Greece
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Aggeli IK, Koustas E, Gaitanaki C, Beis I. Curcumin acts as a pro-oxidant inducing apoptosis via JNKs in the isolated perfused Rana ridibunda heart. ACTA ACUST UNITED AC 2013; 319:328-39. [PMID: 23630153 DOI: 10.1002/jez.1797] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/19/2012] [Revised: 03/26/2013] [Accepted: 04/01/2013] [Indexed: 02/05/2023]
Abstract
Amphibians are known to better tolerate and endure adverse environmental conditions such as redox imbalances conferred by reactive oxygen species (ROS), compared to mammals. Interestingly, the exact adaptation strategies and signaling mechanisms mediating these effects have not been fully elucidated. Therefore, in the present study, we probed into the molecular response of the isolated perfused Rana ridibunda heart to curcumin, in the context of mitogen-activated protein kinases (MAPKs) phosphorylation patterns and apoptotic markers occurrence. In particular, this polyphenol was found to exert a pro-oxidant effect in our model and to significantly upregulate p38-MAPK and JNKs phosphorylation (thus activation). The early apoptosis observed, substantiated by poly(ADP-ribose) polymerase (PARP) cleavage, was established to be JNKs- and ROS-mediated, while no involvement of p38-MAPK was detected. Subsequently, the pro-oxidative activity of curcumin was confirmed to mimic H(2) O(2). Furthermore, NADPH oxidase as well as Na(+) /K(+) -ATPase were found to mediate JNKs phosphorylation as well as PARP proteolytic cleavage. Curcumin exerts pleiotropic actions, both beneficial and detrimental and is currently the subject of intense scientific research. Being a low-molecular-weight antioxidant, it is intriguing to investigate curcumin's role in redox homeostasis in the amphibian heart, under conditions that apparently favor its pro-oxidative properties. Comparative studies of its multifaceted role in different species may contribute to the clarification of the signaling mechanisms it triggers and the terminal physiological response it confers. Collectively, this is to our knowledge, the first time that the signal transduction pathways stimulated by curcumin have been assessed in a non-mammalian species.
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Affiliation(s)
- Ioanna-Katerina Aggeli
- Department of Animal and Human Physiology, School of Biology, University of Athens, Panepistimioupolis, Athens, Greece
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Yu AL, Moriniere J, Welge-Lussen U. TGF-β 2- and H 2O 2-Induced Biological Changes in Optic Nerve Head Astrocytes Are Reduced by the Antioxidant Alpha-Lipoic Acid. Ophthalmic Res 2012; 48:156-64. [DOI: 10.1159/000337835] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/28/2011] [Accepted: 02/06/2012] [Indexed: 01/08/2023]
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Lan A, Liao X, Mo L, Yang C, Yang Z, Wang X, Hu F, Chen P, Feng J, Zheng D, Xiao L. Hydrogen sulfide protects against chemical hypoxia-induced injury by inhibiting ROS-activated ERK1/2 and p38MAPK signaling pathways in PC12 cells. PLoS One 2011; 6:e25921. [PMID: 21998720 PMCID: PMC3187826 DOI: 10.1371/journal.pone.0025921] [Citation(s) in RCA: 94] [Impact Index Per Article: 7.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/16/2011] [Accepted: 09/13/2011] [Indexed: 11/30/2022] Open
Abstract
Hydrogen sulfide (H(2)S) has been proposed as a novel neuromodulator and neuroprotective agent. Cobalt chloride (CoCl(2)) is a well-known hypoxia mimetic agent. We have demonstrated that H(2)S protects against CoCl(2)-induced injuries in PC12 cells. However, whether the members of mitogen-activated protein kinases (MAPK), in particular, extracellular signal-regulated kinase1/2(ERK1/2) and p38MAPK are involved in the neuroprotection of H(2)S against chemical hypoxia-induced injuries of PC12 cells is not understood. We observed that CoCl(2) induced expression of transcriptional factor hypoxia-inducible factor-1 alpha (HIF-1α), decreased cystathionine-β synthase (CBS, a synthase of H(2)S) expression, and increased generation of reactive oxygen species (ROS), leading to injuries of the cells, evidenced by decrease in cell viability, dissipation of mitochondrial membrane potential (MMP) , caspase-3 activation and apoptosis, which were attenuated by pretreatment with NaHS (a donor of H(2)S) or N-acetyl-L cystein (NAC), a ROS scavenger. CoCl(2) rapidly activated ERK1/2, p38MAPK and C-Jun N-terminal kinase (JNK). Inhibition of ERK1/2 or p38MAPK or JNK with kinase inhibitors (U0126 or SB203580 or SP600125, respectively) or genetic silencing of ERK1/2 or p38MAPK by RNAi (Si-ERK1/2 or Si-p38MAPK) significantly prevented CoCl(2)-induced injuries. Pretreatment with NaHS or NAC inhibited not only CoCl(2)-induced ROS production, but also phosphorylation of ERK1/2 and p38MAPK. Thus, we demonstrated that a concurrent activation of ERK1/2, p38MAPK and JNK participates in CoCl(2)-induced injuries and that H(2)S protects PC12 cells against chemical hypoxia-induced injuries by inhibition of ROS-activated ERK1/2 and p38MAPK pathways. Our results suggest that inhibitors of ERK1/2, p38MAPK and JNK or antioxidants may be useful for preventing and treating hypoxia-induced neuronal injury.
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Affiliation(s)
- Aiping Lan
- Department of Physiology, Zhongshan School of Medicine, Sun Yat-sen University, Guangzhou, People's Republic of China
| | - Xinxue Liao
- Department of Cardiovasology, the First Affiliated Hospital, Sun Yat-sen University, Guangzhou, People's Republic of China
| | - Liqiu Mo
- Department of Anesthesiology, the First Affiliated Hospital, Sun Yat-sen University, Guangzhou, People's Republic of China
| | - Chuntao Yang
- Department of Physiology, Zhongshan School of Medicine, Sun Yat-sen University, Guangzhou, People's Republic of China
| | - Zhanli Yang
- Department of Physiology, Zhongshan School of Medicine, Sun Yat-sen University, Guangzhou, People's Republic of China
| | - Xiuyu Wang
- Department of Physiology, Zhongshan School of Medicine, Sun Yat-sen University, Guangzhou, People's Republic of China
| | - Fen Hu
- Department of Physiology, Zhongshan School of Medicine, Sun Yat-sen University, Guangzhou, People's Republic of China
| | - Peixi Chen
- Department of Physiology, Zhongshan School of Medicine, Sun Yat-sen University, Guangzhou, People's Republic of China
| | - Jianqiang Feng
- Department of Physiology, Zhongshan School of Medicine, Sun Yat-sen University, Guangzhou, People's Republic of China
| | - Dongdan Zheng
- Department of Cardiovasology, Region of Huang pu, the First Affiliated Hospital, Sun Yat-sen University, Guangzhou, People's Republic of China
| | - Liangcan Xiao
- Department of Anesthesiology, the First Affiliated Hospital, Sun Yat-sen University, Guangzhou, People's Republic of China
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Crispo JAG, Ansell DR, Piche M, Eibl JK, Khaper N, Ross GM, Tai TC. Protective effects of polyphenolic compounds on oxidative stress-induced cytotoxicity in PC12 cells. Can J Physiol Pharmacol 2010; 88:429-38. [PMID: 20555411 DOI: 10.1139/y09-137] [Citation(s) in RCA: 33] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/14/2023]
Abstract
To investigate the beneficial properties associated with polyphenols, we screened 12 polyphenols for their ability to increase the viability of PC12 cells subjected to oxidative stress via CoCl2 and H2O2. Cell viability data demonstrate that 50 micromol/L methyl gallate and 50 micromol/L fisetin significantly increase viability of H2O2-stressed cells. Further, viability data suggest that 100 micromol/L epigallocatechin gallate (EGCG) increases basal viability, but has no rescue effect on cells stressed with CoCl2 or H2O2. Analysis of intracellular reactive oxygen species (ROS) shows that EGCG, methyl gallate, and gallic acid are effective in reducing CoCl2-derived ROS, and that methyl gallate is effective in attenuating H2O2-derived ROS. Examination of nitric oxide concentrations shows that methyl gallate significantly increases nitric oxide, both in nonstressed and H2O2-stressed cells, whereas EGCG results are consistent with the scavenging of nitric oxide under nonstressed and stressed conditions. Furthermore, analysis of total glutathione levels reveals that EGCG, methyl gallate, and gallic acid pretreatments with and without H2O2 stress have the ability to significantly alter glutathione metabolism. These findings suggest that EGCG, methyl gallate, and gallic acid may have potential therapeutic properties.
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Affiliation(s)
- James A G Crispo
- Medical Sciences Division, Northern Ontario School of Medicine, and Department of Chemistry and Biochemistry, Laurentian University, Sudbury, Ontario, Canada
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Chen TH, Chang CF, Yu SC, Wang JC, Chen CH, Chan P, Lee HM. Dipyridamole inhibits cobalt chloride-induced osteopontin expression in NRK52E cells. Eur J Pharmacol 2009; 613:10-8. [DOI: 10.1016/j.ejphar.2009.03.063] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/02/2008] [Revised: 03/12/2009] [Accepted: 03/23/2009] [Indexed: 10/20/2022]
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Kamiya T, Hara H, Yamada H, Imai H, Inagaki N, Adachi T. Cobalt chloride decreases EC-SOD expression through intracellular ROS generation and p38-MAPK pathways in COS7 cells. Free Radic Res 2009; 42:949-56. [PMID: 19031313 DOI: 10.1080/10715760802566566] [Citation(s) in RCA: 34] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
Abstract
It is known that cells suffer a chronic hypoxic condition during the development of proximal tubulointerstitial disease. However, it is accepted that extracellular-superoxide dismutase (EC-SOD) protects the cells from oxidative stress. The purpose of this study was to elucidate the regulation of EC-SOD expression in cells under hypoxia. The results show that the expressions of EC-SOD mRNA and protein in cobalt chloride (CoCl(2))-treated COS7 cells decreased in a dose- and time-dependent manner, whereas the expressions of other SOD isoforms (Cu/Zn-SOD and Mn-SOD) were not changed. The down-regulation of EC-SOD mRNA was suppressed by pre-treatment with the antioxidant trolox and the p38 mitogen-activated protein kinase (p38-MAPK) inhibitor SB203580. It is concluded that the expression of EC-SOD is decreased through ROS and p38-MAPK signalling cascades and that the down-regulation of EC-SOD leads to a decrease in the resistance to oxidative stress of COS7 cells under hypoxia induced by CoCl(2).
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Affiliation(s)
- Tetsuro Kamiya
- Department of Biomedical Pharmaceutics, Laboratory of Clinical Pharmaceutics, Gifu Pharmaceutical University, Gifu, Japan.
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