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Palma FR, Coelho DR, Pulakanti K, Sakiyama MJ, Huang Y, Ogata FT, Danes JM, Meyer A, Furdui CM, Spitz DR, Gomes AP, Gantner BN, Rao S, Backman V, Bonini MG. Histone H3.1 is a chromatin-embedded redox sensor triggered by tumor cells developing adaptive phenotypic plasticity and multidrug resistance. Cell Rep 2024; 43:113897. [PMID: 38493478 DOI: 10.1016/j.celrep.2024.113897] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/26/2023] [Revised: 01/08/2024] [Accepted: 02/16/2024] [Indexed: 03/19/2024] Open
Abstract
Chromatin structure is regulated through posttranslational modifications of histone variants that modulate transcription. Although highly homologous, histone variants display unique amino acid sequences associated with specific functions. Abnormal incorporation of histone variants contributes to cancer initiation, therapy resistance, and metastasis. This study reports that, among its biologic functions, histone H3.1 serves as a chromatin redox sensor that is engaged by mitochondrial H2O2. In breast cancer cells, the oxidation of H3.1Cys96 promotes its eviction and replacement by H3.3 in specific promoters. We also report that this process facilitates the opening of silenced chromatin domains and transcriptional activation of epithelial-to-mesenchymal genes associated with cell plasticity. Scavenging nuclear H2O2 or amino acid substitution of H3.1(C96S) suppresses plasticity, restores sensitivity to chemotherapy, and induces remission of metastatic lesions. Hence, it appears that increased levels of H2O2 produced by mitochondria of breast cancer cells directly promote redox-regulated H3.1-dependent chromatin remodeling involved in chemoresistance and metastasis.
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Affiliation(s)
- Flavio R Palma
- Department of Medicine, Division of Hematology Oncology, Northwestern University Feinberg School of Medicine and the Robert H. Lurie Comprehensive Cancer Center of Chicago, Chicago, IL 60611, USA
| | - Diego R Coelho
- Department of Medicine, Division of Hematology Oncology, Northwestern University Feinberg School of Medicine and the Robert H. Lurie Comprehensive Cancer Center of Chicago, Chicago, IL 60611, USA
| | - Kirthi Pulakanti
- Versiti Blood Research Institute of Wisconsin, and Department of Cell Biology, Neurobiology, and Anatomy, Medical College of Wisconsin, Milwaukee, WI 53226, USA; Department of Medicine, Medical College of Wisconsin, Milwaukee, WI 53226, USA
| | - Marcelo J Sakiyama
- Department of Medicine, Division of Hematology Oncology, Northwestern University Feinberg School of Medicine and the Robert H. Lurie Comprehensive Cancer Center of Chicago, Chicago, IL 60611, USA
| | - Yunping Huang
- Department of Medicine, Division of Hematology Oncology, Northwestern University Feinberg School of Medicine and the Robert H. Lurie Comprehensive Cancer Center of Chicago, Chicago, IL 60611, USA
| | - Fernando T Ogata
- Department of Medicine, Division of Hematology Oncology, Northwestern University Feinberg School of Medicine and the Robert H. Lurie Comprehensive Cancer Center of Chicago, Chicago, IL 60611, USA
| | - Jeanne M Danes
- Department of Medicine, Division of Hematology Oncology, Northwestern University Feinberg School of Medicine and the Robert H. Lurie Comprehensive Cancer Center of Chicago, Chicago, IL 60611, USA
| | - Alison Meyer
- Versiti Blood Research Institute of Wisconsin, and Department of Cell Biology, Neurobiology, and Anatomy, Medical College of Wisconsin, Milwaukee, WI 53226, USA; Department of Medicine, Medical College of Wisconsin, Milwaukee, WI 53226, USA
| | - Cristina M Furdui
- Department of Internal Medicine, Section on Molecular Medicine, Wake Forest School of Medicine, Winston-Salem, NC 27157, USA
| | - Douglas R Spitz
- Free Radical and Radiation Biology Program, Department of Radiation Oncology, Holden Comprehensive Cancer Center, University of Iowa, Iowa City, IA 52245, USA
| | - Ana P Gomes
- Molecular Oncology Program, H. Lee Moffitt Cancer Center, Tampa, FL 33612, USA
| | - Benjamin N Gantner
- Department of Medicine, Medical College of Wisconsin, Milwaukee, WI 53226, USA
| | - Sridhar Rao
- Versiti Blood Research Institute of Wisconsin, and Department of Cell Biology, Neurobiology, and Anatomy, Medical College of Wisconsin, Milwaukee, WI 53226, USA; Department of Medicine, Medical College of Wisconsin, Milwaukee, WI 53226, USA
| | - Vadim Backman
- Department of Biomedical Engineering, Northwestern University McCormick School of Engineering, Evanston, IL 60208, USA
| | - Marcelo G Bonini
- Department of Medicine, Division of Hematology Oncology, Northwestern University Feinberg School of Medicine and the Robert H. Lurie Comprehensive Cancer Center of Chicago, Chicago, IL 60611, USA; Department of Biochemistry and Molecular Genetics, Northwestern University Feinberg School of Medicine, Chicago, IL 60611, USA.
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Verma S, Ogata FT, Moreno IY, Prinholato da Silva C, Marforio TD, Calvaresi M, Sen M, Coulson-Thomas VJ, Gesteira TF. Rational design and synthesis of lumican stapled peptides for promoting corneal wound healing. Ocul Surf 2023; 30:168-178. [PMID: 37742739 DOI: 10.1016/j.jtos.2023.09.007] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/22/2023] [Revised: 09/06/2023] [Accepted: 09/20/2023] [Indexed: 09/26/2023]
Abstract
PURPOSE Lumican is a major extracellular matrix (ECM) component in the cornea that is upregulated after injury and promotes corneal wound healing. We have recently shown that peptides designed based on the 13 C-terminal amino acids of lumican (LumC13 and LumC13C-A) are able to recapitulate the effects of lumican on promoting corneal wound healing. Herein we used computational chemistry to develop peptide mimetics derived from LumC13C-A with increased stability and half-life that are biologically active and non-toxic, thereby promoting corneal wound healing with increased pharmacological potential. METHODS Different peptides staples were rationalized using LumC13C-A sequence by computational chemistry, docked to TGFβRI and the interface binding energies compared. Lowest scoring peptides were synthesized, and the toxicity of peptides tested using CCK8-based cell viability assay. The efficacy of the stapled peptides at promoting corneal wound healing was tested using a proliferation assay, an in vitro scratch assay using human corneal epithelial cells and an in vivo murine corneal debridement wound healing model. RESULTS Binding free energies were calculated using MMGBSA algorithm, and peptides LumC13C and LumC13S5 displayed superior binding to ALK5 compared to the non-stapled peptide LumC13C-A. The presence of the hydrocarbon staple in LumC13C enhances the stability of the α-helical conformation, thereby facilitating more optimal interactions with the ALK5 receptor. The stapled peptides do not present cytotoxic effects on human corneal epithelial cells at a 300 nM concentration. Similar to lumican and LumC13C-A, both C13C and LumC13S5 significantly promote corneal wound healing both in vitro and in vivo. CONCLUSIONS Highly stable and non-toxic stapled peptides designed based on LumC13, significantly promote corneal wound healing. As a proof of principle, our data shows that more stable and pharmacologically relevant peptides can be designed based on endogenous peptide sequences for treating various corneal pathologies.
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Affiliation(s)
- Sudhir Verma
- College of Optometry, University of Houston, Houston, TX, USA; Department of Zoology, Deen Dayal Upadhyaya College, University of Delhi, New Delhi, India
| | | | - Isabel Y Moreno
- College of Optometry, University of Houston, Houston, TX, USA
| | | | - Tainah Dorina Marforio
- Department of Chemistry "Giacomo Ciamician", Alma Mater Studiorum - University of Bologna, Italy
| | - Matteo Calvaresi
- Department of Chemistry "Giacomo Ciamician", Alma Mater Studiorum - University of Bologna, Italy
| | - Mehmet Sen
- Department of Biology and Biochemistry, University of Houston, Houston, TX, USA
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Ogata FT, Branco V, Vale FF, Coppo L. Glutaredoxin: Discovery, redox defense and much more. Redox Biol 2021; 43:101975. [PMID: 33932870 PMCID: PMC8102999 DOI: 10.1016/j.redox.2021.101975] [Citation(s) in RCA: 50] [Impact Index Per Article: 16.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/27/2020] [Revised: 04/07/2021] [Accepted: 04/10/2021] [Indexed: 01/15/2023] Open
Abstract
Glutaredoxin, Grx, is a small protein containing an active site cysteine pair and was discovered in 1976 by Arne Holmgren. The Grx system, comprised of Grx, glutathione, glutathione reductase, and NADPH, was first described as an electron donor for Ribonucleotide Reductase but, from the first discovery in E.coli, the Grx family has impressively grown, particularly in the last two decades. Several isoforms have been described in different organisms (from bacteria to humans) and with different functions. The unique characteristic of Grxs is their ability to catalyse glutathione-dependent redox regulation via glutathionylation, the conjugation of glutathione to a substrate, and its reverse reaction, deglutathionylation. Grxs have also recently been enrolled in iron sulphur cluster formation. These functions have been implied in various physiological and pathological conditions, from immune defense to neurodegeneration and cancer development thus making Grx a possible drug target. This review aims to give an overview on Grxs, starting by a phylogenetic analysis of vertebrate Grxs, followed by an analysis of the mechanisms of action, the specific characteristics of the different human isoforms and a discussion on aspects related to human physiology and diseases.
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Affiliation(s)
- Fernando T Ogata
- Department of Biochemistry/Molecular Biology, CTCMol, Universidade Federal de São Paulo, Rua Mirassol, 207. 04044-010, São Paulo - SP, Brazil
| | - Vasco Branco
- Research Institute for Medicines (iMed.ULisboa), Faculty of Pharmacy, Universidade de Lisboa, Av. Prof. Gama Pinto, 1649-003, Lisboa, Portugal
| | - Filipa F Vale
- Host-Pathogen Interactions Unit, Research Institute for Medicines (iMed-ULisboa), Faculty of Pharmacy, Universidade de Lisboa, Lisboa, Portugal
| | - Lucia Coppo
- Division of Biochemistry, Department of Medical Biochemistry and Biophysics, Karolinska Institute, Solnavägen 9, SE-17165, Stockholm, Sweden.
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Curcio MF, Batista WL, Castro ED, Strumillo ST, Ogata FT, Alkmim W, Brunialti MKC, Salomão R, Turcato G, Diaz RS, Monteiro HP, Janini LMR. Nitric oxide stimulates a PKC-Src-Akt signaling axis which increases human immunodeficiency virus type 1 replication in human T lymphocytes. Nitric Oxide 2019; 93:78-89. [PMID: 31539562 DOI: 10.1016/j.niox.2019.09.004] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/07/2018] [Revised: 08/12/2019] [Accepted: 09/16/2019] [Indexed: 12/13/2022]
Abstract
Human immunodeficiency virus (HIV) infections are typically accompanied by high levels of secreted inflammatory cytokines and generation of high levels of reactive oxygen species (ROS). To elucidate how HIV-1 alters the cellular redox environment during viral replication, we used human HIV-1 infected CD4+T lymphocytes and uninfected cells as controls. ROS and nitric oxide (NO) generation, antioxidant enzyme activity, protein phosphorylation, and viral and proviral loads were measured at different times (2-36 h post-infection) in the presence and absence of the NO donor S-nitroso-N-acetylpenicillamine (SNAP). HIV-1 infection increased ROS generation and decreased intracellular NO content. Upon infection, we observed increases in copper/zinc superoxide dismutase (SOD1) and glutathione peroxidase (GPx) activities, and a marked decrease in glutathione (GSH) concentration. Exposure of HIV-1 infected CD4+T lymphocytes to SNAP resulted in an increasingly oxidizing intracellular environment, associated with tyrosine nitration and SOD1 inhibition. In addition, SNAP treatment promoted phosphorylation and activation of the host's signaling proteins, PKC, Src kinase and Akt. Inhibition of PKC leads to inhibition of Src kinase strongly suggesting that PKC is the upstream element in this signaling cascade. Changes in the intracellular redox environment after SNAP treatment had an effect on HIV-1 replication as reflected by increases in proviral and viral loads. In the absence or presence of SNAP, we observed a decrease in viral load in infected CD4+T lymphocytes pre-incubated with the PKC inhibitor GF109203X. In conclusion, oxidative/nitrosative stress conditions derived from exposure of HIV-1-infected CD4+T lymphocytes to an exogenous NO source trigger a signaling cascade involving PKC, Src kinase and Akt. Activation of this signaling cascade appears to be critical to the establishment of HIV-1 infection.
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Affiliation(s)
- Marli F Curcio
- Department of Medicine/Infectious Diseases, Universidade Federal de São Paulo, São Paulo, Brazil.
| | - Wagner L Batista
- Department of Microbiology, Immunology and Parasitology, Universidade Federal de São Paulo, São Paulo, Brazil; Department of Pharmaceutical Sciences, Universidade Federal de São Paulo, Diadema, Brazil
| | - Eloísa D Castro
- Department of Biochemistry/Molecular Biology, CTCMol, Universidade Federal de São Paulo, Brazil
| | - Scheilla T Strumillo
- Department of Biochemistry/Molecular Biology, CTCMol, Universidade Federal de São Paulo, Brazil
| | - Fernando T Ogata
- Structural and Functional Ecology of Ecosystems, Universidade Paulista, Sorocaba, Brazil
| | - Wagner Alkmim
- Department of Microbiology, Immunology and Parasitology, Universidade Federal de São Paulo, São Paulo, Brazil
| | - Milena K C Brunialti
- Department of Medicine/Infectious Diseases, Universidade Federal de São Paulo, São Paulo, Brazil
| | - Reinaldo Salomão
- Department of Medicine/Infectious Diseases, Universidade Federal de São Paulo, São Paulo, Brazil
| | - Gilberto Turcato
- Department of Medicine/Infectious Diseases, Universidade Federal de São Paulo, São Paulo, Brazil
| | - Ricardo S Diaz
- Department of Medicine/Infectious Diseases, Universidade Federal de São Paulo, São Paulo, Brazil
| | - Hugo P Monteiro
- Department of Biochemistry/Molecular Biology, CTCMol, Universidade Federal de São Paulo, Brazil
| | - Luiz Mário R Janini
- Department of Medicine/Infectious Diseases, Universidade Federal de São Paulo, São Paulo, Brazil; Department of Microbiology, Immunology and Parasitology, Universidade Federal de São Paulo, São Paulo, Brazil
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Ren X, Santhosh SM, Coppo L, Ogata FT, Lu J, Holmgren A. The combination of ascorbate and menadione causes cancer cell death by oxidative stress and replicative stress. Free Radic Biol Med 2019; 134:350-358. [PMID: 30703479 DOI: 10.1016/j.freeradbiomed.2019.01.037] [Citation(s) in RCA: 32] [Impact Index Per Article: 6.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/29/2018] [Revised: 01/25/2019] [Accepted: 01/26/2019] [Indexed: 12/21/2022]
Abstract
The combination of ascorbate and menadione (VC:VK3 = 100:1) is an investigational treatment for cancer under clinical trials. Dehydroascorbic acid (DHA), the oxidized form of ascorbate, can be taken up by cells via glucose transporters, over-expressed in many cancer cells. It has been known that the combination of VC/VK3 kills cancer cells by inducing hydrogen peroxide (H2O2) via a redox cycling reaction. However, the mechanism has not been fully understood yet. Intracellularly, DHA is reduced to ascorbate by NADPH via GSH and glutaredoxin as well as by thioredoxin (Trx) and the selenoenzyme thioredoxin reductase (TrxR). These two systems are also critical as electron donors for ribonucleotide reductase (RNR), which produces deoxyribonucleotides de novo for DNA replication and DNA repair and is highly expressed in tumor cells. We found that RNR was highly sensitive to VC/VK3 in vitro with similar effects as observed with H2O2. In cancer cells, VC/VK3 inhibited RNR mainly by targeting its R2 subunit. More importantly, both the Trx and GSH systems were oxidized by the combination, which resulted in the loss of GSH, increased protein glutathionylation, and highly oxidized Trx1. The mechanism of cell death induced by VC/VK3 was also elucidated. We found that VC/VK3 inhibited glutathione peroxidase activity and led to an elevated level of lipid peroxidation, which triggered apoptosis-inducing factor (AIF) mediated cell death pathway. Therefore, the combination not only induced replicative stress by inhibiting RNR, but also oxidative stress by targeting anti-oxidant systems and triggered AIF-mediated cancer cell death.
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Affiliation(s)
- Xiaoyuan Ren
- Department of Medical Biochemistry and Biophysics, Karolinska Institutet, S-17177, Stockholm, Sweden
| | - Sebastin M Santhosh
- Department of Medical Biochemistry and Biophysics, Karolinska Institutet, S-17177, Stockholm, Sweden
| | - Lucia Coppo
- Department of Medical Biochemistry and Biophysics, Karolinska Institutet, S-17177, Stockholm, Sweden
| | - Fernando T Ogata
- Department of Medical Biochemistry and Biophysics, Karolinska Institutet, S-17177, Stockholm, Sweden
| | - Jun Lu
- Department of Medical Biochemistry and Biophysics, Karolinska Institutet, S-17177, Stockholm, Sweden; School of Pharmaceutical Sciences, Southwest University, 400715, Chongqing, China
| | - Arne Holmgren
- Department of Medical Biochemistry and Biophysics, Karolinska Institutet, S-17177, Stockholm, Sweden.
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Lucena SV, Moura GEDD, Rodrigues T, Watashi CM, Melo FH, Icimoto MY, Viana GM, Nader HB, Monteiro HP, Tersariol ILS, Ogata FT. Heparan sulfate proteoglycan deficiency up-regulates the intracellular production of nitric oxide in Chinese hamster ovary cell lines. J Cell Physiol 2017; 233:3176-3194. [DOI: 10.1002/jcp.26160] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/16/2017] [Accepted: 08/17/2017] [Indexed: 01/01/2023]
Affiliation(s)
| | | | - Tiago Rodrigues
- Centro de Ciências Naturais e Humanas (CCNH)-UFABC; Santo André São Paulo Brazil
| | - Carolina M. Watashi
- Centro de Ciências Naturais e Humanas (CCNH)-UFABC; Santo André São Paulo Brazil
| | - Fabiana H. Melo
- Faculdade de Ciências Médicas da Santa Casa de São Paulo; São Paulo São Paulo Brazil
| | | | | | - Helena B. Nader
- Departamento de Bioquímica-UNIFESP; São Paulo São Paulo Brazil
| | | | - Ivarne L. S. Tersariol
- Departamento de Bioquímica-UNIFESP; São Paulo São Paulo Brazil
- Centro Interdisciplinar de Investigação Bioquímica UMC; Mogi das Cruzes São PauloSão Paulo Brazil
| | - Fernando T. Ogata
- Departamento de Bioquímica-UNIFESP; São Paulo São Paulo Brazil
- Division of Biochemistry, Medical Biochemistry & Biophysics, Karolinska Institutet; Stockholm Sweden
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Monteiro HP, Ogata FT. S-nitrosylation/denitrosylation regulates myoblast proliferation. Focus on "Balance between S-nitrosylation and denitrosylation modulates myoblast proliferation independently of soluble guanylyl cyclase activation". Am J Physiol Cell Physiol 2017. [PMID: 28637676 DOI: 10.1152/ajpcell.00127.2017] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Affiliation(s)
- Hugo P Monteiro
- Department of Biochemistry - Center for Cellular and Molecular Therapy, Escola Paulista de Medicina, Universidade Federal de São Paulo, São Paulo, Brazil; and
| | - Fernando T Ogata
- Division of Biochemistry, Medical Biochemistry and Biophysics, Karolinska Institutet, Stockholm, Sweden
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Monteiro HP, Ogata FT, Stern A. Thioredoxin promotes survival signaling events under nitrosative/oxidative stress associated with cancer development. Biomed J 2017; 40:189-199. [PMID: 28918907 PMCID: PMC6136292 DOI: 10.1016/j.bj.2017.06.002] [Citation(s) in RCA: 21] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/06/2017] [Revised: 06/05/2017] [Accepted: 06/05/2017] [Indexed: 02/07/2023] Open
Abstract
Accumulating mutations may drive cells into the acquisition of abnormal phenotypes that are characteristic of cancer cells. Cancer cells feature profound alterations in proliferation programs that result in a new population of cells that overrides normal tissue construction and maintenance programs. To achieve this goal, cancer cells are endowed with up regulated survival signaling pathways. They also must counteract the cytotoxic effects of high levels of nitric oxide (NO) and of reactive oxygen species (ROS), which are by products of cancer cell growth. Accumulating experimental evidence associates cancer cell survival with their capacity to up-regulate antioxidant systems. Elevated expression of the antioxidant protein thioredoxin-1 (Trx1) has been correlated with cancer development. Trx1 has been characterized as a multifunctional protein, playing different roles in different cell compartments. Trx1 migrates to the nucleus in cells exposed to nitrosative/oxidative stress conditions. Trx1 nuclear migration has been related to the activation of transcription factors associated with cell survival and cell proliferation. There is a direct association between the p21Ras-ERK1/2 MAP Kinases survival signaling pathway and Trx1 nuclear migration under nitrosative stress. The expression of the cytoplasmic protein, the thioredoxin-interacting protein (Txnip), determines the change in Trx1 cellular compartmentalization. The anti-apoptotic actions of Trx1 and its denitrosylase activity occur in the cytoplasm and serve as important regulators of cell survival. Within this context, this review focuses on the participation of Trx1 in cells under nitrosative/oxidative stress in survival signaling pathways associated with cancer development.
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Affiliation(s)
- Hugo P Monteiro
- Department of Biochemistry, Center for Cellular and Molecular Therapy - CTCMol, Paulista Medical School/Federal University of São Paulo, SP, Brazil
| | - Fernando T Ogata
- Department of Biochemistry, Center for Cellular and Molecular Therapy - CTCMol, Paulista Medical School/Federal University of São Paulo, SP, Brazil; Division of Biochemistry, Medical Biochemistry & Biophysics, Karolinska Institutet, Stockholm, Sweden
| | - Arnold Stern
- New York University School of Medicine, New York, NY, USA.
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Batista WL, Ogata FT, Curcio MF, Miguel RB, Arai RJ, Matsuo AL, Moraes MS, Stern A, Monteiro HP. S-nitrosoglutathione and endothelial nitric oxide synthase-derived nitric oxide regulate compartmentalized ras S-nitrosylation and stimulate cell proliferation. Antioxid Redox Signal 2013; 18:221-38. [PMID: 22894707 DOI: 10.1089/ars.2011.4455] [Citation(s) in RCA: 34] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Abstract
AIMS S-nitrosylation of Cys118 is a redox-based mechanism for Ras activation mediated by nitric oxide (NO) at the plasma membrane. RESULTS Ras signaling pathway stimulation by 50 and/or 100 μM of S-nitrosoglutathione (GSNO) causes proliferation of HeLa cells. Proliferation was not observed in HeLa cells overexpressing non-nitrosatable H-Ras(C118S). HeLa cells overexpressing H-Ras(wt) containing the spatiotemporal probe green fluorescent protein (GFP) fused to the Ras-binding domain of Raf-1 (GFP-RBD) incubated with 100 μM GSNO stimulated a rapid and transient redistribution of GFP-RBD to the plasma membrane, followed by a delayed and sustained recruitment to the Golgi. No activation of H-Ras at the plasma membrane occurred in cells overexpressing H-Ras(C118S), contrasting with a robust and sustained activation of the GTPase at the Golgi. Inhibition of Src kinase prevented cell proliferation and activation of H-Ras by GSNO at the Golgi. Human umbilical vein endothelial cells (HUVECs) stimulated with bradykinin to generate NO were used to differentiate cell proliferation and Ras activation at the plasma membrane versus Golgi. In this model, Src kinase was not involved in cell proliferation, whereas Ras activation proceeded only at the plasma membrane, indicating that HUVEC proliferation induced by NO resulted only from stimulation of Ras. INNOVATION The present work is the first to demonstrate that NO-mediated activation of Ras in different subcellular compartments regulates different downstream signaling pathways. CONCLUSION S-nitrosylation of H-Ras at Cys(118) and the activation of Src kinase are spatiotemporally linked events of the S-nitrosothiol-mediated signaling pathway that occurs at the plasma membrane and at the Golgi. The nonparticipation of Src kinase and the localized production of NO by endothelial NO synthase at the plasma membrane limited NO-mediated Ras activation to the plasma membrane.
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Affiliation(s)
- Wagner L Batista
- Department of Biological Sciences, Universidade Federal de São Paulo/Campus Diadema, São Paulo, Brazil
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Gesteira TF, Coulson-Thomas VJ, Ogata FT, Farias EHC, Cavalheiro RP, de Lima MA, Cunha GLA, Nakayasu ES, Almeida IC, Toma L, Nader HB. A novel approach for the characterisation of proteoglycans and biosynthetic enzymes in a snail model. Biochim Biophys Acta 2011; 1814:1862-9. [PMID: 21854878 DOI: 10.1016/j.bbapap.2011.07.024] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/21/2011] [Revised: 07/13/2011] [Accepted: 07/29/2011] [Indexed: 10/17/2022]
Abstract
Proteoglycans encompass a heterogeneous group of glycoconjugates where proteins are substituted with linear, highly negatively charged glycosaminoglycan chains. Sulphated glycosaminoglycans are ubiquitous to the animal kingdom of the Eukarya domain. Information on the distribution and characterisation of proteoglycans in invertebrate tissues is limited and restricted to a few species. By the use of multidimensional protein identification technology and immunohistochemistry, this study shows for the first time the presence and tissue localisation of different proteoglycans, such as perlecan, aggrecan, and heparan sulphate proteoglycan, amongst others, in organs of the gastropoda Achatina fulica. Through a proteomic analysis of Golgi proteins and immunohistochemistry of tissue sections, we detected the machinery involved in glycosaminoglycan biosynthesis, related to polymer formation (polymerases), as well as secondary modifications (sulphation and uronic acid epimerization). Therefore, this work not only identifies both the proteoglycan core proteins and glycosaminoglycan biosynthetic enzymes in invertebrates but also provides a novel method for the study of glycosaminoglycan and proteoglycan evolution.
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Affiliation(s)
- Tarsis F Gesteira
- Departamento de Bioquímica, Universidade Federal de São Paulo, São Paulo, Brazil
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