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Luque EM, Díaz-Luján CM, Paira DA, de Loredo N, Torres PJ, Cantarelli VI, Fretes R, Motrich RD, Martini AC. Ghrelin misbalance affects mice embryo implantation and pregnancy success by uterine immune dysregulation and nitrosative stress. Front Endocrinol (Lausanne) 2023; 14:1288779. [PMID: 38107518 PMCID: PMC10722256 DOI: 10.3389/fendo.2023.1288779] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/04/2023] [Accepted: 11/09/2023] [Indexed: 12/19/2023] Open
Abstract
Introduction In a previous study we found that ghrelin (Ghrl) misbalance during the peri-implantation period significantly impaired fetus development. In this study we aimed to evaluate the putative mechanisms underlying these effects, including embryo implantation success, uterine nitric oxide synthase (NOS) activity, nitric oxide synthesis and the inflammatory/immune uterine profile. Methods Ghrelin misbalance was induced by injecting 4nmol/animal/day of Ghrl (hyperghrelinemia) or 6nmol/animal/day of a Ghrl antagonist (Ant: (D-Lys3)GHRP-6) from day 3 to 8 of pregnancy. Control animals (C) were injected with de vehicle. Females were euthanized at pregnancy day 8 and their uteri excised in order to evaluate: the percentage of reabsorbed embryos (microscopically), eNOS, iNOS and nytrotirosine expression (by immunohistochemistry), nitrite synthesis (by Griess technique), VEGF, IL-10, IL-17, IL-6, MMP9 and GM-CSF expression (by qPCR) and leukocyte infiltration by flow cytometry (evaluating T cells, NK cells, granulocytes, dendritic cells and macrophages). Results Ant-treatment significantly increased the percentage of reabsorbed embryos and the uterine expression of eNOS, iNOS and nytrotirosine. (D-Lys3)GHRP-6-treatment increased also the expression of the inflammatory cytokines IL-6, IL-17 and MMP9, and decreased that of IL-10 (anti-inflammatory). Moreover, Ant-treatment increased also the NK cells population and that of CD11b+ dendritic cells; and decreased T cells percentages. Similarly, hyperghrelinemia showed a significant increase vs. C on eNOS, iNOS and nytrotirosineuterine expression and a decrease in T cells percentages. Conclusion Ghrl misbalance during the peri-implantation period induces pro-inflammatory changes and nitrosative stress in the gravid uterus, impairing significantly embryo implantation and/or development.
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Affiliation(s)
- Eugenia Mercedes Luque
- Instituto de Fisiología, Facultad de Ciencias Médicas, Universidad Nacional de Córdoba, Córdoba, Argentina
- Instituto de Investigaciones en Ciencias de la Salud (INICSA), Consejo Nacional de Investigaciones Científicas y Tecnológicas (CONICET)/Universidad Nacional de Córdoba (UNC), Córdoba, Argentina
| | - Cintia María Díaz-Luján
- Instituto de Biología Celular, Facultad de Ciencias Médicas, Universidad Nacional de Córdoba, Córdoba, Argentina
| | - Daniela Andrea Paira
- Departamento de Bioquímica Clínica, Facultad de Ciencias Químicas, Universidad Nacional de Córdoba, Córdoba, Argentina
- Centro de Investigaciones en Bioquímica Clínica e Inmunología (CIBICI), Consejo Nacional de Investigaciones Científicas y Tecnológicas (CONICET)/Universidad Nacional de Córdoba (UNC), Córdoba, Argentina
| | - Nicolás de Loredo
- Instituto de Fisiología, Facultad de Ciencias Médicas, Universidad Nacional de Córdoba, Córdoba, Argentina
| | - Pedro Javier Torres
- Instituto de Fisiología, Facultad de Ciencias Médicas, Universidad Nacional de Córdoba, Córdoba, Argentina
- Instituto de Investigaciones en Ciencias de la Salud (INICSA), Consejo Nacional de Investigaciones Científicas y Tecnológicas (CONICET)/Universidad Nacional de Córdoba (UNC), Córdoba, Argentina
| | - Verónica Inés Cantarelli
- Instituto de Fisiología, Facultad de Ciencias Médicas, Universidad Nacional de Córdoba, Córdoba, Argentina
- Instituto de Investigaciones en Ciencias de la Salud (INICSA), Consejo Nacional de Investigaciones Científicas y Tecnológicas (CONICET)/Universidad Nacional de Córdoba (UNC), Córdoba, Argentina
| | - Ricardo Fretes
- Instituto de Investigaciones en Ciencias de la Salud (INICSA), Consejo Nacional de Investigaciones Científicas y Tecnológicas (CONICET)/Universidad Nacional de Córdoba (UNC), Córdoba, Argentina
- Instituto de Biología Celular, Facultad de Ciencias Médicas, Universidad Nacional de Córdoba, Córdoba, Argentina
| | - Rubén Darío Motrich
- Departamento de Bioquímica Clínica, Facultad de Ciencias Químicas, Universidad Nacional de Córdoba, Córdoba, Argentina
- Centro de Investigaciones en Bioquímica Clínica e Inmunología (CIBICI), Consejo Nacional de Investigaciones Científicas y Tecnológicas (CONICET)/Universidad Nacional de Córdoba (UNC), Córdoba, Argentina
| | - Ana Carolina Martini
- Instituto de Fisiología, Facultad de Ciencias Médicas, Universidad Nacional de Córdoba, Córdoba, Argentina
- Instituto de Investigaciones en Ciencias de la Salud (INICSA), Consejo Nacional de Investigaciones Científicas y Tecnológicas (CONICET)/Universidad Nacional de Córdoba (UNC), Córdoba, Argentina
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da Silva MC, dos Santos VM, da Silva MVB, Prazeres TCMM, Cartágenes MDSS, Calzerra NTM, de Queiroz TM. Involvement of shedding induced by ADAM17 on the nitric oxide pathway in hypertension. Front Mol Biosci 2022; 9:1032177. [PMID: 36310604 PMCID: PMC9614329 DOI: 10.3389/fmolb.2022.1032177] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/30/2022] [Accepted: 10/04/2022] [Indexed: 11/15/2022] Open
Abstract
A Disintegrin and Metalloprotease 17 (ADAM17), also called tumor necrosis factor-ɑ (TNF-ɑ) convertase (TACE), is a well-known protease involved in the sheddase of growth factors, chemokines and cytokines. ADAM17 is also enrolled in hypertension, especially by shedding of angiotensin converting enzyme type 2 (ACE2) leading to impairment of angiotensin 1–7 [Ang-(1–7)] production and injury in vasodilation, induction of renal damage and cardiac hypertrophy. Activation of Mas receptor (MasR) by binding of Ang-(1–7) induces an increase in the nitric oxide (NO) gaseous molecule, which is an essential factor of vascular homeostasis and blood pressure control. On the other hand, TNF-ɑ has demonstrated to stimulate a decrease in nitric oxide bioavailability, triggering a disrupt in endothelium-dependent vasorelaxation. In spite of the previous studies, little knowledge is available about the involvement of the metalloprotease 17 and the NO pathways. Here we will provide an overview of the role of ADAM17 and Its mechanisms implicated with the NO formation.
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Affiliation(s)
- Mirelly Cunha da Silva
- Laboratory of Nutrition, Physical Activity and Phenotypic Plasticity, Federal University of Pernambuco, Vitória de Santo Antão, Brazil
| | - Vanessa Maria dos Santos
- Laboratory of Nutrition, Physical Activity and Phenotypic Plasticity, Federal University of Pernambuco, Vitória de Santo Antão, Brazil
| | - Matheus Vinícius B. da Silva
- Laboratory of Nutrition, Physical Activity and Phenotypic Plasticity, Federal University of Pernambuco, Vitória de Santo Antão, Brazil
| | | | | | | | - Thyago Moreira de Queiroz
- Laboratory of Nutrition, Physical Activity and Phenotypic Plasticity, Federal University of Pernambuco, Vitória de Santo Antão, Brazil
- *Correspondence: Thyago Moreira de Queiroz,
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Anti-SARS-CoV-2S Antibody Levels in Healthcare Workers 10 Months after the Administration of Two BNT162b2 Vaccine Doses in View of Demographic Characteristic and Previous COVID-19 Infection. Vaccines (Basel) 2022; 10:vaccines10050741. [PMID: 35632498 PMCID: PMC9146273 DOI: 10.3390/vaccines10050741] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/07/2022] [Revised: 04/16/2022] [Accepted: 05/06/2022] [Indexed: 02/01/2023] Open
Abstract
Antibody levels that confer full protection against SARS-CoV-2 infection after the administration of different vaccine brands as well as the factors influencing the humoral immune response have been analyzed extensively ever since the vaccination program was launched in late 2020. The aim of this study was to determine anti-SARS-CoV-2S antibody titers in 100 healthcare workers 10 months after the administration of two BNT162b2 vaccine doses, and to investigate the influence of demographic characteristics, the presence of comorbidities and history of COVID-19 infection. The results were compared with antibody levels that were determined eight months after the administration of two BNT162b2 vaccine doses in our previous study. Antibody levels in venous blood serum were measured by the ECLIA method with the use of the Roche Cobas e411 analyzer. In all tested subjects, antibody titers remained high 10 months after vaccination, particularly in recovered COVID-19 patients, and only a minor decrease was observed relative to the values noted two months earlier.
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Cyclosporin A activates human hepatocellular carcinoma (HepG2 cells) proliferation: implication of EGFR-mediated ERK1/2 signaling pathway. Naunyn Schmiedebergs Arch Pharmacol 2020; 393:897-908. [PMID: 31907582 DOI: 10.1007/s00210-019-01798-w] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/06/2019] [Accepted: 12/19/2019] [Indexed: 11/27/2022]
Abstract
One of the most common causes of cancer mortality worldwide is hepatocellular carcinoma (HCC). Extracellular signal-regulated kinase (ERK1/2) pathway has been shown to play an important role in the development and progression of HCC. Here, we demonstrate that the immunosuppressive agent cyclosporin A (CsA) has the ability to increase the cellular growth in HCC (HepG2 cells) via activation of ERK1/2 signaling cascade. It was found that ERK1/2 phosphorylation induced by CsA was highly reduced in the presence of the reactive oxygen species (ROS) scavenger polyethylene glycol-superoxide dismutase (PEG-SOD). Furthermore, it was observed that inhibition of metalloproteinase activity using TAPI-2 prevents ERK1/2 activation by CsA. Moreover, a disintegrin and metalloproteinase domain 17 (ADAM-17) activity was found to be critical for ERK phosphorylation by CsA. In addition, CsA-induced ERK phosphorylation was highly reduced in the presence of either neutralizing anti-heparin-binding-epidermal growth factor (HB-EGF) antibody or UO126 (MEK inhibitor). By using the epidermal growth factor receptor (EGFR) tyrosine kinase inhibitor AG1478, it was found that EGFR is critical for ERK phosphorylation induced by CsA. Furthermore, CsA-induced cell proliferation was strongly reduced in the presence of either PEG-SOD or TAPI-2 or neutralizing anti-ADAM17 antibody or neutralizing anti-HB-EGF antibody or AG1478 or UO126. Collectively, these data demonstrate that CsA has the ability to activate ERK1/2 signaling cascade that could be translated into an increase in HepG2 cell proliferation. Furthermore, these data support the role of ROS, ADAM-17, and EGFR in ERK1/2 signaling activation and subsequent cell proliferation induced by CsA in HepG2 cells.
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Palau V, Pascual J, Soler MJ, Riera M. Role of ADAM17 in kidney disease. Am J Physiol Renal Physiol 2019; 317:F333-F342. [DOI: 10.1152/ajprenal.00625.2018] [Citation(s) in RCA: 28] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022] Open
Abstract
It is known that the renin-angiotensin system plays a major role in the pathophysiology of cardiovascular disease and renal injury. Within the renin-angiotensin system, angiotensin-converting enzyme 2 (ACE2) cleaves ANG II to generate ANG(1–7) peptide, which counteracts the adverse effects of ANG II accumulation. ACE2 can undergo cleavage or shedding to release the catalytically active ectodomain into the circulation by a disintegrin and metalloprotease (ADAM)17, also known as TNF-α-converting enzyme. ADAM17 is involved in many pathological processes such as cancer, inflammatory diseases, neurological diseases, cardiovascular diseases, atherosclerosis, diabetes, and hypertension. Clinical and experimental studies have shown that ADAM17 is involved in chronic kidney disease (CKD) with a proinflammatory and profibrotic role, suggesting that it could be an important mediator of CKD progression. ADAM17 inhibition attenuates fibrosis and inflammation, suggesting that its inhibition may be a possible new valuable therapeutic tool in fibrotic kidney disease treatment. In addition, in renal disease, some experimental studies have demonstrated that ADAM17 is differently expressed in the kidney. Thus, ADAM17 is highly expressed in distal renal tubules and increased in the whole kidney in diabetic models. In this article, we will review the role of ADAM17 under physiological and pathological conditions. We will mainly focus on the importance of ADAM17 in the context of CKD.
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Affiliation(s)
- Vanesa Palau
- Department of Nephrology, Hospital del Mar Medical Research Institute, Barcelona, Spain
| | - Julio Pascual
- Department of Nephrology, Hospital del Mar Medical Research Institute, Barcelona, Spain
| | - Maria José Soler
- Department of Nephrology, Hospital del Mar Medical Research Institute, Barcelona, Spain
| | - Marta Riera
- Department of Nephrology, Hospital del Mar Medical Research Institute, Barcelona, Spain
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Bae EH, Kim IJ, Choi HS, Kim HY, Kim CS, Ma SK, Kim IS, Kim SW. Tumor necrosis factor α-converting enzyme inhibitor attenuates lipopolysaccharide-induced reactive oxygen species and mitogen-activated protein kinase expression in human renal proximal tubule epithelial cells. THE KOREAN JOURNAL OF PHYSIOLOGY & PHARMACOLOGY : OFFICIAL JOURNAL OF THE KOREAN PHYSIOLOGICAL SOCIETY AND THE KOREAN SOCIETY OF PHARMACOLOGY 2018. [PMID: 29520166 PMCID: PMC5840072 DOI: 10.4196/kjpp.2018.22.2.135] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
Abstract
Tumor necrosis factor-α (TNFα) and the angiotensin system are involved in inflammatory diseases and may contribute to acute kidney injury. We investigated the mechanisms by which TNFα-converting enzyme (TACE) contributes to lipopolysaccharide (LPS)-induced renal inflammation and the effect of TACE inhibitor treatment on LPS-induced cellular injury in human renal proximal tubule epithelial (HK-2) cells. Mice were treated with LPS (10 mg/kg, i.p.) and HK-2 cells were cultured with or without LPS (10 µg/ml) in the presence or absence of a type 1 TACE inhibitor (1 µM) or type 2 TACE inhibitor (10 µM). LPS treatment induced increased serum creatinine, TNFα, and urinary neutrophil gelatinase-associated lipocalin. Angiotensin II type 1 receptor, mitogen activated protein kinase (MAPK), and TACE increased, while angiotensin-converting enzyme-2 (ACE2) expression decreased in LPS-induced acute kidney injury and LPS-treated HK-2 cells. LPS induced reactive oxygen species and the down-regulation of ACE2, and these responses were prevented by TACE inhibitors in HK-2 cells. TACE inhibitors increased cell viability in LPS-treated HK-2 cells and attenuated oxidative stress and inflammatory cytokines. Our findings indicate that LPS activates renin angiotensin system components via the activation of TACE. Furthermore, inhibitors of TACE are potential therapeutic agents for kidney injury.
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Affiliation(s)
- Eun Hui Bae
- Department of Internal Medicine, Chonnam National University Medical School, Gwangju 61707, Korea
| | - In Jin Kim
- Department of Internal Medicine, Chonnam National University Medical School, Gwangju 61707, Korea
| | - Hong Sang Choi
- Department of Internal Medicine, Chonnam National University Medical School, Gwangju 61707, Korea
| | - Ha Yeon Kim
- Department of Internal Medicine, Chonnam National University Medical School, Gwangju 61707, Korea
| | - Chang Seong Kim
- Department of Internal Medicine, Chonnam National University Medical School, Gwangju 61707, Korea
| | - Seong Kwon Ma
- Department of Internal Medicine, Chonnam National University Medical School, Gwangju 61707, Korea
| | - In S Kim
- Global Desalination Research Center (GDRC), School of Environmental Science and Engineering (SESE), Gwangju Institute of Science and Technology (GIST), Gwnagju 61005, Korea
| | - Soo Wan Kim
- Department of Internal Medicine, Chonnam National University Medical School, Gwangju 61707, Korea
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Ibáñez-Vea M, Huang H, Martínez de Morentin X, Pérez E, Gato M, Zuazo M, Arasanz H, Fernández-Irigoyen J, Santamaría E, Fernandez-Hinojal G, Larsen MR, Escors D, Kochan G. Characterization of Macrophage Endogenous S-Nitrosoproteome Using a Cysteine-Specific Phosphonate Adaptable Tag in Combination with TiO 2 Chromatography. J Proteome Res 2018; 17:1172-1182. [PMID: 29338241 DOI: 10.1021/acs.jproteome.7b00812] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/15/2023]
Abstract
Protein S-nitrosylation is a cysteine post-translational modification mediated by nitric oxide. An increasing number of studies highlight S-nitrosylation as an important regulator of signaling involved in numerous cellular processes. Despite the significant progress in the development of redox proteomic methods, identification and quantification of endogeneous S-nitrosylation using high-throughput mass-spectrometry-based methods is a technical challenge because this modification is highly labile. To overcome this drawback, most methods induce S-nitrosylation chemically in proteins using nitrosylating compounds before analysis, with the risk of introducing nonphysiological S-nitrosylation. Here we present a novel method to efficiently identify endogenous S-nitrosopeptides in the macrophage total proteome. Our approach is based on the labeling of S-nitrosopeptides reduced by ascorbate with a cysteine specific phosphonate adaptable tag (CysPAT), followed by titanium dioxide (TiO2) chromatography enrichment prior to nLC-MS/MS analysis. To test our procedure, we performed a large-scale analysis of this low-abundant modification in a murine macrophage cell line. We identified 569 endogeneous S-nitrosylated proteins compared with 795 following exogenous chemically induced S-nitrosylation. Importantly, we discovered 579 novel S-nitrosylation sites. The large number of identified endogenous S-nitrosylated peptides allowed the definition of two S-nitrosylation consensus sites, highlighting protein translation and redox processes as key S-nitrosylation targets in macrophages.
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Affiliation(s)
- María Ibáñez-Vea
- Immunomodulation Group, Navarrabiomed Biomedical Research Center, Navarra Institute for Health Research (IdiSNA) , Irunlarrea 3, 31008 Pamplona, Spain
| | - Honggang Huang
- Department of Biochemistry and Molecular Biology, University of Southern Denmark , Campusvej 55, DK 5230 Odense M, Denmark
| | - Xabier Martínez de Morentin
- Bioinformatics Group, Navarrabiomed Biomedical Research Center, Navarra Institute for Health Research (IdiSNA) , Irunlarrea 3, 31008 Pamplona, Spain
| | - Estela Pérez
- Proteored - ISCIII, Navarrabiomed Biomedical Research Center, Navarra Institute for Health Research (IdiSNA) , Irunlarrea 3, 31008 Pamplona, Spain
| | - Maria Gato
- Immunomodulation Group, Navarrabiomed Biomedical Research Center, Navarra Institute for Health Research (IdiSNA) , Irunlarrea 3, 31008 Pamplona, Spain
| | - Miren Zuazo
- Immunomodulation Group, Navarrabiomed Biomedical Research Center, Navarra Institute for Health Research (IdiSNA) , Irunlarrea 3, 31008 Pamplona, Spain
| | - Hugo Arasanz
- Immunomodulation Group, Navarrabiomed Biomedical Research Center, Navarra Institute for Health Research (IdiSNA) , Irunlarrea 3, 31008 Pamplona, Spain
| | - Joaquin Fernández-Irigoyen
- Proteored - ISCIII, Navarrabiomed Biomedical Research Center, Navarra Institute for Health Research (IdiSNA) , Irunlarrea 3, 31008 Pamplona, Spain
| | - Enrique Santamaría
- Proteored - ISCIII, Navarrabiomed Biomedical Research Center, Navarra Institute for Health Research (IdiSNA) , Irunlarrea 3, 31008 Pamplona, Spain
| | - Gonzalo Fernandez-Hinojal
- Immunomodulation Group, Navarrabiomed Biomedical Research Center, Navarra Institute for Health Research (IdiSNA) , Irunlarrea 3, 31008 Pamplona, Spain
| | - Martin R Larsen
- Department of Biochemistry and Molecular Biology, University of Southern Denmark , Campusvej 55, DK 5230 Odense M, Denmark
| | - David Escors
- Immunomodulation Group, Navarrabiomed Biomedical Research Center, Navarra Institute for Health Research (IdiSNA) , Irunlarrea 3, 31008 Pamplona, Spain.,Division of Infection and Immunity, Rayne Institute, University College London , 5 University Street, WC1E 6JF London, United Kingdom
| | - Grazyna Kochan
- Immunomodulation Group, Navarrabiomed Biomedical Research Center, Navarra Institute for Health Research (IdiSNA) , Irunlarrea 3, 31008 Pamplona, Spain
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Chemaly M, McGilligan V, Gibson M, Clauss M, Watterson S, Alexander HD, Bjourson AJ, Peace A. Role of tumour necrosis factor alpha converting enzyme (TACE/ADAM17) and associated proteins in coronary artery disease and cardiac events. Arch Cardiovasc Dis 2017; 110:700-711. [DOI: 10.1016/j.acvd.2017.08.002] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/05/2017] [Revised: 08/13/2017] [Accepted: 08/16/2017] [Indexed: 02/07/2023]
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Basudhar D, Somasundaram V, de Oliveira GA, Kesarwala A, Heinecke JL, Cheng RY, Glynn SA, Ambs S, Wink DA, Ridnour LA. Nitric Oxide Synthase-2-Derived Nitric Oxide Drives Multiple Pathways of Breast Cancer Progression. Antioxid Redox Signal 2017; 26:1044-1058. [PMID: 27464521 PMCID: PMC5488348 DOI: 10.1089/ars.2016.6813] [Citation(s) in RCA: 50] [Impact Index Per Article: 7.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
Abstract
SIGNIFICANCE Breast cancer is the second leading cause of cancer-related deaths among women in the United States. Development and progression of malignancy are associated with diverse cell signaling pathways that control cell proliferation, survival, motility, invasion, and metastasis. Recent Advances: An increasing number of clinical studies have implicated a strong relationship between elevated tumor nitric oxide synthase-2 (NOS2) expression and poor patient survival. CRITICAL ISSUES Herein, we review what we believe to be key mechanisms in the role(s) of NOS2-derived nitric oxide (NO) as a driver of breast cancer disease progression. High NO increases cyclooxygenase-2 activity, hypoxia inducible factor-1 alpha protein stabilization, and activation of important cell signaling pathways, including phosphoinositide 3-kinase/protein kinase B, mitogen-activated protein kinase, epidermal growth factor receptor, and Ras, through post-translational protein modifications. Moreover, dysregulated NO flux within the tumor microenvironment has other important roles, including the promotion of angiogenesis and modulation of matrix metalloproteinase/tissue inhibitor matrix metalloproteinase associated with tumor progression. FUTURE DIRECTIONS The elucidation of these and other NO-driven pathways implicates NOS2 as a key driver of breast cancer disease progression and provides a new perspective in the identification of novel targets that may be therapeutically beneficial in the treatment of estrogen receptor-negative disease. Antioxid. Redox Signal. 26, 1044-1058.
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Affiliation(s)
- Debashree Basudhar
- Cancer and Inflammation Program, National Cancer Institute-Frederick, Frederick, Maryland
| | - Veena Somasundaram
- Cancer and Inflammation Program, National Cancer Institute-Frederick, Frederick, Maryland
| | | | - Aparna Kesarwala
- Radiation Oncology Branch, National Cancer Institute, Bethesda, Maryland
| | - Julie L. Heinecke
- Cancer and Inflammation Program, National Cancer Institute-Frederick, Frederick, Maryland
| | - Robert Y. Cheng
- Cancer and Inflammation Program, National Cancer Institute-Frederick, Frederick, Maryland
| | - Sharon A. Glynn
- Pathology, Lambe Institute for Translational Research, School of Medicine, National University of Ireland, Galway, Ireland
| | - Stefan Ambs
- Laboratory of Human Carcinogenesis, National Cancer Institute, Bethesda, Maryland
| | - David A. Wink
- Cancer and Inflammation Program, National Cancer Institute-Frederick, Frederick, Maryland
| | - Lisa A. Ridnour
- Cancer and Inflammation Program, National Cancer Institute-Frederick, Frederick, Maryland
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Activation of muscarinic receptors prevents TNF-α-mediated intestinal epithelial barrier disruption through p38 MAPK. Cell Signal 2017; 35:188-196. [PMID: 28412413 DOI: 10.1016/j.cellsig.2017.04.007] [Citation(s) in RCA: 24] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/21/2016] [Revised: 03/30/2017] [Accepted: 04/10/2017] [Indexed: 02/08/2023]
Abstract
Intestinal epithelial cells form a tight barrier to act as selective physical barriers, repelling hostile substances. Tumor necrosis factor-α (TNF-α) is a well characterized pro-inflammatory cytokine which can compromise intestinal barrier function and the suppression of TNF-α function is important for treatment of inflammatory bowel disease (IBD). In this study, we investigated the contribution of G-protein-coupled receptor (GPCR)-induced signalling pathways to the maintenance of epithelial barrier function. We first demonstrated the existence of functional muscarinic M3 and histamine H1 receptors in colonic epithelial cell HT-29/B6. As we previously reported, muscarinic M3 receptor prevented TNF-α-induced barrier disruption through acceleration of TNF receptor (TNFR) shedding which is carried out by TNF-α converting enzyme (TACE). M3 receptor-mediated suppression of TNF-α function depends on Gαq/11 protein, however, histamine H1 receptor could not ameliorate TNF-α function, while which could induce Gαq/11 dependent intracellular Ca2+ mobilization. We found that p38 MAPK was predominantly phosphorylated by M3 receptor through Gαq/11 protein, whereas H1 receptor barely upregulated the phosphorylation. Inhibition of p38 MAPK abolished M3 receptor-mediated TNFR shedding and suppression of TNF-α-induced NF-κB signalling. The p38 MAPK was also involved in TACE- mediated EGFR transactivation followed by ERK1/2 phosphorylation. These results indicate that not H1 but M3 receptor-induced activation of p38 MAPK might contribute to the maintenance of epithelial barrier function through down-regulation of TNF-α signalling and activation of EGFR.
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Xu J, Mukerjee S, Silva-Alves CRA, Carvalho-Galvão A, Cruz JC, Balarini CM, Braga VA, Lazartigues E, França-Silva MS. A Disintegrin and Metalloprotease 17 in the Cardiovascular and Central Nervous Systems. Front Physiol 2016; 7:469. [PMID: 27803674 PMCID: PMC5067531 DOI: 10.3389/fphys.2016.00469] [Citation(s) in RCA: 41] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/26/2016] [Accepted: 09/30/2016] [Indexed: 01/19/2023] Open
Abstract
ADAM17 is a metalloprotease and disintegrin that lodges in the plasmatic membrane of several cell types and is able to cleave a wide variety of cell surface proteins. It is somatically expressed in mammalian organisms and its proteolytic action influences several physiological and pathological processes. This review focuses on the structure of ADAM17, its signaling in the cardiovascular system and its participation in certain disorders involving the heart, blood vessels, and neural regulation of autonomic and cardiovascular modulation.
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Affiliation(s)
- Jiaxi Xu
- Department of Pharmacology and Experimental Therapeutics and Cardiovascular Center of Excellence, Louisiana State University Health Sciences Center New Orleans, LA, USA
| | - Snigdha Mukerjee
- Department of Pharmacology and Experimental Therapeutics and Cardiovascular Center of Excellence, Louisiana State University Health Sciences Center New Orleans, LA, USA
| | | | | | - Josiane C Cruz
- Centro de Biotecnologia, Universidade Federal da Paraíba João Pessoa, Brazil
| | - Camille M Balarini
- Centro de Ciências da Saúde, Universidade Federal da Paraíba João Pessoa, Brazil
| | - Valdir A Braga
- Centro de Biotecnologia, Universidade Federal da Paraíba João Pessoa, Brazil
| | - Eric Lazartigues
- Department of Pharmacology and Experimental Therapeutics and Cardiovascular Center of Excellence, Louisiana State University Health Sciences Center New Orleans, LA, USA
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Lee M, Li S, Sato K, Jin M. Interphotoreceptor Retinoid-Binding Protein Mitigates Cellular Oxidative Stress and Mitochondrial Dysfunction Induced by All-trans-Retinal. Invest Ophthalmol Vis Sci 2016; 57:1553-62. [PMID: 27046120 PMCID: PMC4824376 DOI: 10.1167/iovs.15-18551] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022] Open
Abstract
Purpose Point and null mutations in interphotoreceptor retinoid-binding protein (IRBP) cause retinal dystrophy in affected patients and IRBP-deficient mice with unknown mechanism. This study investigated whether IRBP protects cells from damages induced by all-trans-retinal (atRAL), which was increased in the Irbp−/− retina. Methods Wild-type and Irbp−/− mice retinal explants in buffer with or without purified IBRP were exposed to 800 lux light for different times and subjected to retinoid analysis by high-performance liquid chromatography. Purity of IRBP was determined by Coomassie Brilliant Blue staining and immunoblot analysis. Cellular damages induced by atRAL in the presence or absence of IRBP were evaluated in the mouse photoreceptor-derived 661W cells. Cell viability and death were measured by 3-(4,5-dimethyl-2-yl)-5-(3-carboxymethoxyphenyl)-2-(4-sulfophenyl)-2H-tetrazolium (MTS) and TUNEL assays. Expression and modification levels of retinal proteins were determined by immunoblot analysis. Intracellular reactive oxygen species (ROS) and nitric oxide (NO) were detected with fluorogenic dyes and confocal microscopy. Mitochondrial membrane potential was analyzed by using JC-1 fluorescent probe and a flow cytometer. Results Content of atRAL in Irbp−/− retinal explants exposed to light for 40 minutes was significantly higher than that in wild-type retinas under the same light conditions. All-trans-retinal caused increase in cell death, tumor necrosis factor activation, and Adam17 upregulation in 661W cells. NADPH oxidase-1 (NOX1) upregulation, ROS generation, NO-mediated protein S-nitrosylation, and mitochondrial dysfunction were also observed in 661W cells treated with atRAL. These cytotoxic effects were significantly attenuated in the presence of IRBP. Conclusions Interphotoreceptor retinoid-binding protein is required for preventing accumulation of retinal atRAL, which causes inflammation, oxidative stress, and mitochondrial dysfunction of the cells.
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13
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Gur-Cohen S, Kollet O, Graf C, Esmon CT, Ruf W, Lapidot T. Regulation of long-term repopulating hematopoietic stem cells by EPCR/PAR1 signaling. Ann N Y Acad Sci 2016; 1370:65-81. [PMID: 26928241 DOI: 10.1111/nyas.13013] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/24/2015] [Revised: 01/05/2016] [Accepted: 01/11/2016] [Indexed: 01/18/2023]
Abstract
The common developmental origin of endothelial and hematopoietic cells is manifested by coexpression of several cell surface receptors. Adult murine bone marrow (BM) long-term repopulating hematopoietic stem cells (LT-HSCs), endowed with the highest repopulation and self-renewal potential, express endothelial protein C receptor (EPCR), which is used as a marker to isolate them. EPCR/protease-activated receptor-1 (PAR1) signaling in endothelial cells has anticoagulant and anti-inflammatory roles, while thrombin/PAR1 signaling induces coagulation and inflammation. Recent studies define two new PAR1-mediated signaling cascades that regulate EPCR(+) LT-HSC BM retention and egress. EPCR/PAR1 signaling facilitates LT-HSC BM repopulation, retention, survival, and chemotherapy resistance by restricting nitric oxide (NO) production, maintaining NO(low) LT-HSC BM retention with increased VLA4 expression, affinity, and adhesion. Conversely, acute stress and clinical mobilization upregulate thrombin generation and activate different PAR1 signaling that overcomes BM EPCR(+) LT-HSC retention, inducing their recruitment to the bloodstream. Thrombin/PAR1 signaling induces NO generation, TACE-mediated EPCR shedding, and upregulation of CXCR4 and PAR1, leading to CXCL12-mediated stem and progenitor cell mobilization. This review discusses new roles for factors traditionally viewed as coagulation related, which independently act in the BM to regulate PAR1 signaling in bone- and blood-forming progenitor cells, navigating their fate by controlling NO production.
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Affiliation(s)
- Shiri Gur-Cohen
- Department of Immunology, Weizmann Institute of Science, Rehovot, Israel
| | - Orit Kollet
- Department of Immunology, Weizmann Institute of Science, Rehovot, Israel
| | - Claudine Graf
- Center for Thrombosis and Hemostasis and Johannes Gutenberg University Medical Center, Mainz, Germany.,Third Medical Department, Johannes Gutenberg University Medical Center, Mainz, Germany
| | - Charles T Esmon
- Coagulation Biology Laboratory, Oklahoma Medical Research Foundation and Departments of Pathology and Biochemistry & Molecular Biology, University of Oklahoma Health Sciences Center, Oklahoma City, Oklahoma
| | - Wolfram Ruf
- Center for Thrombosis and Hemostasis and Johannes Gutenberg University Medical Center, Mainz, Germany.,Department of Immunology and Microbial Science, the Scripps Research Institute, La Jolla, California
| | - Tsvee Lapidot
- Department of Immunology, Weizmann Institute of Science, Rehovot, Israel
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14
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Deng M, Loughran PA, Zhang L, Scott MJ, Billiar TR. Shedding of the tumor necrosis factor (TNF) receptor from the surface of hepatocytes during sepsis limits inflammation through cGMP signaling. Sci Signal 2015; 8:ra11. [PMID: 25628461 DOI: 10.1126/scisignal.2005548] [Citation(s) in RCA: 51] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022]
Abstract
Proteolytic cleavage of the tumor necrosis factor (TNF) receptor (TNFR) from the cell surface contributes to anti-inflammatory responses and may be beneficial in reducing the excessive inflammation associated with multiple organ failure and mortality during sepsis. Using a clinically relevant mouse model of polymicrobial abdominal sepsis, we found that the production of inducible nitric oxide synthase (iNOS) in hepatocytes led to the cyclic guanosine monophosphate (cGMP)-dependent activation of the protease TACE (TNF-converting enzyme) and the shedding of TNFR. Furthermore, treating mice with a cGMP analog after the induction of sepsis increased TNFR shedding and decreased systemic inflammation. Similarly, increasing the abundance of cGMP with a clinically approved phosphodiesterase 5 inhibitor (sildenafil) also decreased markers of systemic inflammation, protected against organ injury, and increased circulating amounts of TNFR1 in mice with sepsis. We further confirmed that a similar iNOS-cGMP-TACE pathway was required for TNFR1 shedding by human hepatocytes in response to the bacterial product lipopolysaccharide. Our data suggest that increasing the bioavailability of cGMP might be beneficial in ameliorating the inflammation associated with sepsis.
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Affiliation(s)
- Meihong Deng
- Department of Surgery, University of Pittsburgh, Pittsburgh, PA 15213, USA
| | - Patricia A Loughran
- Department of Surgery, University of Pittsburgh, Pittsburgh, PA 15213, USA. Center for Biologic Imaging, University of Pittsburgh, Pittsburgh, PA 15213, USA
| | - Liyong Zhang
- Department of Surgery, University of Pittsburgh, Pittsburgh, PA 15213, USA
| | - Melanie J Scott
- Department of Surgery, University of Pittsburgh, Pittsburgh, PA 15213, USA
| | - Timothy R Billiar
- Department of Surgery, University of Pittsburgh, Pittsburgh, PA 15213, USA.
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15
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Liu LJ, Leung KH, Lin S, Chan DSH, Susanti D, Rao W, Chan PWH, Ma DL, Leung CH. Pharmacophore modeling for the identification of small-molecule inhibitors of TACE. Methods 2015; 71:92-7. [DOI: 10.1016/j.ymeth.2014.09.005] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/08/2014] [Revised: 09/02/2014] [Accepted: 09/14/2014] [Indexed: 01/27/2023] Open
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Naringenin reduces cholesterol-induced hepatic inflammation in rats by modulating matrix metalloproteinases-2, 9 via inhibition of nuclear factor κB pathway. Eur J Pharmacol 2014; 746:96-105. [PMID: 25446569 DOI: 10.1016/j.ejphar.2014.10.027] [Citation(s) in RCA: 79] [Impact Index Per Article: 7.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/13/2014] [Revised: 10/14/2014] [Accepted: 10/15/2014] [Indexed: 12/15/2022]
Abstract
Nonalcoholic fatty liver disease (NAFLD) is a spectrum of hepatic abnormalities that extends from isolated steatosis to non-alcoholic steatohepatitis (NASH) and steatofibrosis. NASH is the progressive form of the disease that can lead to fibrosis, cirrhosis and hepatocellular carcinoma. Naringenin (NGEN), a healthful food, increases resistance to oxidative stress, inflammation and protects against multiple organ injury in various animal models. However, specific mechanisms responsible for such effects are poorly understood. Thus, this study investigates the effect of treatment with NGEN (50mg/kg) on oxidative events and the molecular mechanisms underlying inflammatory changes triggered in the rat liver by a high cholesterol diet for 90 days. NGEN significantly decreased the plasma fatty acid composition, the hepatic pro-inflammatory mediators and the expression of relevant genes including tumor necrosis factor-α, interlukin-6, interleukin-1β, inducible nitric oxide synthase and matrix metalloproteinases (MMP-2, 9), EGF-like module-containing mucin-like hormone receptor-like 1 (macrophage F4/80-specific gene); which suggests a reduced macrophage infiltration, and inhibited oxidative stress related biomarker levels at the end point of the experiment. Mechanistically, studies showed that NGEN markedly reduced lipid and protein oxidations, recruited the anti-oxidative defense system and promoted extracellular matrix degradation by modulating the levels of necrotic inflammation.
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17
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Li YP, Niu A, Wen Y. Regulation of myogenic activation of p38 MAPK by TACE-mediated TNFα release. Front Cell Dev Biol 2014; 2:21. [PMID: 25364728 PMCID: PMC4207040 DOI: 10.3389/fcell.2014.00021] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/11/2014] [Accepted: 05/07/2014] [Indexed: 11/24/2022] Open
Abstract
The activation of p38 MAPK in myogenic precursor cells (MPCs) is a key signal for their exit of cell cycle and entry of the myogenic differentiation program. Therefore, identification of the signaling mechanism that activates p38 MAPK during this process is important for the understanding of the regulatory mechanism of muscle regeneration. This article reviews recent findings regarding the role of inflammatory cytokine tumor necrosis factor-α (TNFα) as a key activator of p38 MAPK during myogenesis in an autocrine/paracrine fashion, and the signaling mechanisms that converge upon TNFα converting enzyme (TACE) to release TNFα from differentiating MPCs in response to diverse regenerative stimuli.
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Affiliation(s)
- Yi-Ping Li
- Department of Integrative Biology and Pharmacology, University of Texas Health Science Center Houston, TX, USA
| | - Airu Niu
- Department of Integrative Biology and Pharmacology, University of Texas Health Science Center Houston, TX, USA
| | - Yefei Wen
- Department of Integrative Biology and Pharmacology, University of Texas Health Science Center Houston, TX, USA
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18
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O'Sullivan S, Medina C, Ledwidge M, Radomski MW, Gilmer JF. Nitric oxide-matrix metaloproteinase-9 interactions: biological and pharmacological significance--NO and MMP-9 interactions. BIOCHIMICA ET BIOPHYSICA ACTA-MOLECULAR CELL RESEARCH 2014; 1843:603-17. [PMID: 24333402 DOI: 10.1016/j.bbamcr.2013.12.006] [Citation(s) in RCA: 65] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/02/2013] [Revised: 12/02/2013] [Accepted: 12/05/2013] [Indexed: 12/24/2022]
Abstract
Nitric oxide (NO) and matrix metalloproteinase 9 (MMP-9) levels are found to increase in inflammation states and in cancer, and their levels may be reciprocally modulated. Understanding interactions between NO and MMP-9 is of biological and pharmacological relevance and may prove crucial in designing new therapeutics. The reciprocal interaction between NO and MMP-9 have been studied for nearly twenty years but to our knowledge, are yet to be the subject of a review. This review provides a summary of published data regarding the complex and sometimes contradictory effects of NO on MMP-9. We also analyse molecular mechanisms modulating and mediating NO-MMP-9 interactions. Finally, a potential therapeutic relevance of these interactions is presented.
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19
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Guo Z, Jin X, Jia H. Inhibition of ADAM-17 more effectively down-regulates the Notch pathway than that of γ-secretase in renal carcinoma. JOURNAL OF EXPERIMENTAL & CLINICAL CANCER RESEARCH : CR 2013; 32:26. [PMID: 23659326 PMCID: PMC3662624 DOI: 10.1186/1756-9966-32-26] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 03/28/2013] [Accepted: 05/02/2013] [Indexed: 11/10/2022]
Abstract
BACKGROUND Our study is to research the effect of inhibited ADAM-17 expression through the Notch pathway in renal carcinoma. METHODS Immunohistochemistry and western blot were used to examine the expression of ADAM-17 protein in renal cancer tissues. Proliferation and cell invasion of 786-o cells, as well as OS-RC-2 cells, after treatment with two different inhibitors of the Notch pathway, were examined by CCK-8 assay and Transwell assay, respectively. 786-o cell apoptosis was measured using the FCM test. RESULTS ADAM-17 was highly expressed in RCC tissues. Compared with blocking γ-secretase, a known mechanism of impairing Notch, blockade of ADAM-17 more effectively down-regulated the expressions of Notch1 and HES-1 proteins. Similarly, we found that the ADAM-17 inhibitor, Marimastat, could more efficiently reduce renal cell proliferation and invasive capacity in comparison with the γ-secretase inhibitor DAPT when used at the same dose. Similar results were obtained when apoptosis of 786-o was measured. CONCLUSION Compared with γ-secretase, inhibition of ADAM-17 expression more effectively inhibits Notch pathway-mediated renal cancer cell proliferation and invasion. ADAM-17 may be a new target for future treatment of renal carcinoma.
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Affiliation(s)
- Zhen Guo
- Minimally Invasive Urology Center, Provincial Hospital Affiliated to Shandong University, No. 324 Jingwu Road, Jinan 250001, China
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20
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Chanthaphavong RS, Loughran PA, Lee TYS, Scott MJ, Billiar TR. A role for cGMP in inducible nitric-oxide synthase (iNOS)-induced tumor necrosis factor (TNF) α-converting enzyme (TACE/ADAM17) activation, translocation, and TNF receptor 1 (TNFR1) shedding in hepatocytes. J Biol Chem 2012; 287:35887-98. [PMID: 22898814 DOI: 10.1074/jbc.m112.365171] [Citation(s) in RCA: 42] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022] Open
Abstract
We and others have previously shown that the inducible nitric-oxide synthase (iNOS) and nitric oxide (NO) are hepatoprotective in a number of circumstances, including endotoxemia. In vitro, hepatocytes are protected from tumor necrosis factor (TNF) α-induced apoptosis via cGMP-dependent and cGMP-independent mechanisms. We have shown that the cGMP-dependent protective mechanisms involve the inhibition of death-inducing signaling complex formation. We show here that LPS-induced iNOS expression leads to rapid TNF receptor shedding from the surface of hepatocytes via NO/cGMP/protein kinase G-dependent activation and surface translocation of TNFα-converting enzyme (TACE/ADAM17). The activation of TACE is associated with the up-regulation of iRhom2 as well as the interaction and phosphorylation of TACE and iRhom2, which are also NO/cGMP/protein kinase G-dependent. These findings suggest that one mechanism of iNOS/NO-mediated protection of hepatocytes involves the rapid shedding of TNF receptor 1 to limit TNFα signaling.
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Affiliation(s)
- R Savanh Chanthaphavong
- Department of Surgery, University of Pittsburgh School of Medicine, Pittsburgh, Pennsylvania 15213, USA
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21
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Mackinnon JC, Huether P, Kalisch BE. Effects of nerve growth factor and nitric oxide synthase inhibitors on amyloid precursor protein mRNA levels and protein stability. Open Biochem J 2012; 6:31-9. [PMID: 22550546 PMCID: PMC3339428 DOI: 10.2174/1874091x01206010031] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/19/2011] [Revised: 01/05/2012] [Accepted: 01/10/2012] [Indexed: 12/25/2022] Open
Abstract
We determined previously that nitric oxide (NO) modulates the nerve growth factor (NGF)-mediated increases in amyloid precursor protein (APP) levels in PC12 cells. To elucidate potential mechanisms, the effects of NGF and NO synthase (NOS) inhibitors on APP mRNA levels and protein stability were evaluated. Surprisingly, treatment of PC12 cells with NGF resulted in decreased levels of APP695 and APP751/770 mRNA. Therefore, the effect of NGF on APP protein stability was examined using the translation inhibitor, cycloheximide. Under these conditions, NGF did not alter the rate of APP degradation, suggesting that NGF may be enhancing the translation rate of APP. Since NOS inhibitors attenuate the NGF-mediated increase in APP levels, their effect on APP mRNA levels and protein stability was also assessed. S-methylisothiourea (S-MIU), selective for inducible NOS, decreased both APP695 and APP751/770 mRNA levels while the non-selective NOS inhibitor, N(ω)-nitro-L-arginine methylester (L-NAME) had no effect. In both control and NGF-treated PC12 cells, S-MIU increased the half-life of APP, with the greatest effect observed with the APP695 isoform. Based on these data we propose that in PC12 cells, NGF increases APP levels through enhanced translation rate and that NO, which modulates the NGF-induced increase in APP protein, also regulates APP mRNA levels and could play a role in APP processing.
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Affiliation(s)
- Janet C Mackinnon
- Department of Biomedical Sciences, University of Guelph, Guelph, Ontario, N1G 2W1, Canada
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22
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The role of ADAM-mediated shedding in vascular biology. Eur J Cell Biol 2011; 91:472-85. [PMID: 22138087 DOI: 10.1016/j.ejcb.2011.09.003] [Citation(s) in RCA: 163] [Impact Index Per Article: 12.5] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/28/2011] [Revised: 07/08/2011] [Accepted: 09/08/2011] [Indexed: 01/14/2023] Open
Abstract
Within the vasculature the disintegrins and metalloproteinases (ADAMs) 8, 9, 10, 12, 15, 17, 19, 28 and 33 are expressed on endothelial cells, smooth muscle cells and on leukocytes. As surface-expressed proteases they mediate cleavage of vascular surface molecules at an extracellular site close to the membrane. This process is termed shedding and leads to the release of a soluble substrate ectodomain thereby critically modulating the biological function of the substrate. In the vasculature several surface molecules undergo ADAM-mediated shedding including tumour necrosis factor (TNF) α, interleukin (IL) 6 receptor α, L-selectin, vascular endothelial (VE)-cadherin, the transmembrane CX3C-chemokine ligand (CX3CL) 1, Notch, transforming growth factor (TGF) and heparin-binding epidermal growth factor (HB-EGF). These substrates play distinct roles in vascular biology by promoting inflammation, permeability changes, leukocyte recruitment, resolution of inflammation, regeneration and/or neovascularisation. Especially ADAM17 and ADAM10 are capable of cleaving many substrates with diverse function within the vasculature, whereas other ADAMs have a more restricted substrate range. Therefore, targeting ADAM17 or ADAM10 by pharmacologic inhibition or gene knockout not only attenuates the inflammatory response in animal models but also affects tissue regeneration and neovascularisation. Recent discoveries indicate that other ADAMs (e.g. ADAM8 and 9) also play important roles in vascular biology but appear to have more selective effects on vascular responses (e.g. on neovascularisation only). Although, targeting of ADAM17 and ADAM10 in inflammatory diseases is still a promising approach, temporal and spatial as well as substrate-specific inhibition approaches are required to minimise undesired side effects on vascular cells.
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23
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Cheung R, Shen F, Phillips JH, McGeachy MJ, Cua DJ, Heyworth PG, Pierce RH. Activation of MDL-1 (CLEC5A) on immature myeloid cells triggers lethal shock in mice. J Clin Invest 2011; 121:4446-61. [PMID: 22005300 DOI: 10.1172/jci57682] [Citation(s) in RCA: 49] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/21/2011] [Accepted: 08/26/2011] [Indexed: 12/11/2022] Open
Abstract
Systemic inflammatory response syndrome (SIRS) is a potentially lethal condition, as it can progress to shock, multi-organ failure, and death. It can be triggered by infection, tissue damage, or hemorrhage. The role of tissue injury in the progression from SIRS to shock is incompletely understood. Here, we show that treatment of mice with concanavalin A (ConA) to induce liver injury triggered a G-CSF-dependent hepatic infiltration of CD11b+Gr-1+Ly6G+Ly6C+ immature myeloid cells that expressed the orphan receptor myeloid DAP12-associated lectin-1 (MDL-1; also known as CLEC5A). Activation of MDL-1 using dengue virus or an agonist MDL-1-specific antibody in the ConA-treated mice resulted in shock. The MDL-1+ cells were pathogenic, and in vivo depletion of MDL-1+ cells provided protection. Triggering MDL-1 on these cells induced production of NO and TNF-α, which were found to be elevated in the serum of treated mice and required for MDL-1-induced shock. Surprisingly, MDL-1-induced NO and TNF-α production required eNOS but not iNOS. Activation of DAP12, DAP10, Syk, PI3K, and Akt was critical for MDL-1-induced shock. In addition, Akt physically interacted with and activated eNOS. Therefore, triggering of MDL-1 on immature myeloid cells and production of NO and TNF-α may play a critical role in the pathogenesis of shock. Targeting the MDL-1/Syk/PI3K/Akt/eNOS pathway represents a potential new therapeutic strategy to prevent the progression of SIRS to shock.
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Affiliation(s)
- Ricky Cheung
- Discovery Research, Merck Research Laboratories, Palo Alto, California, USA.
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24
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Wang Y, Robertson JD, Walcheck B. Different signaling pathways stimulate a disintegrin and metalloprotease-17 (ADAM17) in neutrophils during apoptosis and activation. J Biol Chem 2011; 286:38980-8. [PMID: 21949123 DOI: 10.1074/jbc.m111.277087] [Citation(s) in RCA: 33] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022] Open
Abstract
ADAM17 is a membrane-associated metalloprotease that cleaves proteins from the surface of neutrophils and modulates the density of various receptors and adhesion molecules. The protease activity of ADAM17 is highly inducible and occurs upon neutrophil activation as well as apoptosis. At this time, little is known about the signal transduction pathway that promotes ADAM17 activity in neutrophils upon the induction of apoptosis. We show that caspase-8 activation, Bid cleavage, and the release of mitochondrial reactive oxygen species are sequential transduction components of the Fas signaling cascade that induces ADAM17. This is different from ADAM17 stimulation upon overt neutrophil activation, which requires MAPK p38 or ERK, but not caspases and reactive oxygen species. ADAM17 activity in apoptotic neutrophils may serve to inactivate select effector molecules that promote the pro-inflammatory activity of recruited neutrophils. For instance, TNFα receptors TNF-RI and TNF-RII are substrates of ADAM17, and we show that they are shed during apoptosis, decreasing neutrophil sensitivity to TNFα. Altogether, our findings provide significant new insights into the signal transduction pathway that stimulates ADAM17 during induced neutrophil apoptosis. ADAM17 induction during apoptosis may rapidly diminish neutrophil sensitivity to the inflammatory environment, complementing other anti-inflammatory activities by these cells during inflammation resolution.
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Affiliation(s)
- Yue Wang
- Department of Veterinary and Biomedical Sciences, University of Minnesota, St. Paul, Minnesota 55108, USA
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25
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Scott AJ, O'Dea KP, O'Callaghan D, Williams L, Dokpesi JO, Tatton L, Handy JM, Hogg PJ, Takata M. Reactive oxygen species and p38 mitogen-activated protein kinase mediate tumor necrosis factor α-converting enzyme (TACE/ADAM-17) activation in primary human monocytes. J Biol Chem 2011; 286:35466-35476. [PMID: 21865167 DOI: 10.1074/jbc.m111.277434] [Citation(s) in RCA: 82] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022] Open
Abstract
Tumor necrosis factor α-converting enzyme (TACE) is responsible for the shedding of cell surface TNF. Studies suggest that reactive oxygen species (ROS) mediate up-regulation of TACE activity by direct oxidization or modification of the protein. However, these investigations have been largely based upon nonphysiological stimulation of promonocytic cell lines which may respond and process TACE differently from primary cells. Furthermore, investigators have relied upon TACE substrate shedding as a surrogate for activity quantification. We addressed these concerns, employing a direct, cell-based fluorometric assay to investigate the regulation of TACE catalytic activity on freshly isolated primary human monocytes during LPS stimulation. We hypothesized that ROS mediate up-regulation of TACE activity indirectly, by activation of intracellular signaling pathways. LPS up-regulated TACE activity rapidly (within 30 min) without changing cell surface TACE expression. Scavenging of ROS or inhibiting their production by flavoprotein oxidoreductases significantly attenuated LPS-induced TACE activity up-regulation. Exogenous ROS (H(2)O(2)) also up-regulated TACE activity with similar kinetics and magnitude as LPS. H(2)O(2)- and LPS-induced TACE activity up-regulation were effectively abolished by a variety of selective p38 MAPK inhibitors. Activation of p38 was redox-sensitive as H(2)O(2) caused p38 phosphorylation, and ROS scavenging significantly reduced LPS-induced phospho-p38 expression. Inhibition of the p38 substrate, MAPK-activated protein kinase 2, completely attenuated TACE activity up-regulation, whereas inhibition of ERK had little effect. Lastly, inhibition of cell surface oxidoreductases prevented TACE activity up-regulation distal to p38 activation. In conclusion, our data indicate that in primary human monocytes, ROS mediate LPS-induced up-regulation of TACE activity indirectly through activation of the p38 signaling pathway.
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Affiliation(s)
- Alasdair J Scott
- Section of Anaesthetics, Pain Medicine, and Intensive Care, Faculty of Medicine, Chelsea and Westminster Hospital, London SW10 9NH, United Kingdom
| | - Kieran P O'Dea
- Section of Anaesthetics, Pain Medicine, and Intensive Care, Faculty of Medicine, Chelsea and Westminster Hospital, London SW10 9NH, United Kingdom
| | - David O'Callaghan
- Section of Anaesthetics, Pain Medicine, and Intensive Care, Faculty of Medicine, Chelsea and Westminster Hospital, London SW10 9NH, United Kingdom
| | - Lynn Williams
- Kennedy Institute of Rheumatology, Imperial College London, London SW7 2AZ, United Kingdom
| | - Justina O Dokpesi
- Section of Anaesthetics, Pain Medicine, and Intensive Care, Faculty of Medicine, Chelsea and Westminster Hospital, London SW10 9NH, United Kingdom
| | - Louise Tatton
- Section of Anaesthetics, Pain Medicine, and Intensive Care, Faculty of Medicine, Chelsea and Westminster Hospital, London SW10 9NH, United Kingdom
| | - Jonathan M Handy
- Section of Anaesthetics, Pain Medicine, and Intensive Care, Faculty of Medicine, Chelsea and Westminster Hospital, London SW10 9NH, United Kingdom
| | - Philip J Hogg
- Lowy Cancer Research Centre, University of New South Wales, Sydney 2052, Australia
| | - Masao Takata
- Section of Anaesthetics, Pain Medicine, and Intensive Care, Faculty of Medicine, Chelsea and Westminster Hospital, London SW10 9NH, United Kingdom.
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26
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Rowlands DJ, Islam MN, Das SR, Huertas A, Quadri SK, Horiuchi K, Inamdar N, Emin MT, Lindert J, Ten VS, Bhattacharya S, Bhattacharya J. Activation of TNFR1 ectodomain shedding by mitochondrial Ca2+ determines the severity of inflammation in mouse lung microvessels. J Clin Invest 2011; 121:1986-99. [PMID: 21519143 DOI: 10.1172/jci43839] [Citation(s) in RCA: 82] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/26/2010] [Accepted: 02/09/2011] [Indexed: 12/25/2022] Open
Abstract
Shedding of the extracellular domain of cytokine receptors allows the diffusion of soluble receptors into the extracellular space; these then bind and neutralize their cytokine ligands, thus dampening inflammatory responses. The molecular mechanisms that control this process, and the extent to which shedding regulates cytokine-induced microvascular inflammation, are not well defined. Here, we used real-time confocal microscopy of mouse lung microvascular endothelium to demonstrate that mitochondria are key regulators of this process. The proinflammatory cytokine soluble TNF-α (sTNF-α) increased mitochondrial Ca2+, and the purinergic receptor P2Y2 prolonged the response. Concomitantly, the proinflammatory receptor TNF-α receptor-1 (TNFR1) was shed from the endothelial surface. Inhibiting the mitochondrial Ca2+ increase blocked the shedding and augmented inflammation, as denoted by increases in endothelial expression of the leukocyte adhesion receptor E-selectin and in microvascular leukocyte recruitment. The shedding was also blocked in microvessels after knockdown of a complex III component and after mitochondria-targeted catalase overexpression. Endothelial deletion of the TNF-α converting enzyme (TACE) prevented the TNF-α receptor shedding response, which suggests that exposure of microvascular endothelium to sTNF-α induced a Ca2+-dependent increase of mitochondrial H2O2 that caused TNFR1 shedding through TACE activation. These findings provide what we believe to be the first evidence that endothelial mitochondria regulate TNFR1 shedding and thereby determine the severity of sTNF-α-induced microvascular inflammation.
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Affiliation(s)
- David J Rowlands
- Lung Biology Laboratory, Division of Pulmonary, Allergy, and Critical Care Medicine, Department of Medicine, Columbia University College of Physicians and Surgeons, New York, New York, USA
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Lemjabbar-Alaoui H, Sidhu SS, Mengistab A, Gallup M, Basbaum C. TACE/ADAM-17 phosphorylation by PKC-epsilon mediates premalignant changes in tobacco smoke-exposed lung cells. PLoS One 2011; 6:e17489. [PMID: 21423656 PMCID: PMC3057966 DOI: 10.1371/journal.pone.0017489] [Citation(s) in RCA: 41] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/12/2010] [Accepted: 02/05/2011] [Indexed: 01/10/2023] Open
Abstract
BACKGROUND Tobacco smoke predisposes humans and animals to develop lung tumors, but the molecular events responsible for this are poorly understood. We recently showed that signaling mechanisms triggered by smoke in lung cells could lead to the activation of a growth factor signaling pathway, thereby promoting hyperproliferation of lung epithelial cells. Hyperproliferation is considered a premalignant change in the lung, in that increased rates of DNA synthesis are associated with an increased number of DNA copying errors, events that are exacerbated in the presence of tobacco smoke carcinogens. Despite the existence of DNA repair mechanisms, a small percentage of these errors go unrepaired and can lead to tumorigenic mutations. The results of our previous study showed that an early event following smoke exposure was the generation of oxygen radicals through the activation of NADPH oxidase. Although it was clear that these radicals transduced signals through the epidermal growth factor receptor (EGFR), and that this was mediated by TACE-dependent cleavage of amphiregulin, it remained uncertain how oxygen radicals were able to activate TACE. PRINCIPAL FINDINGS In the present study, we demonstrate for the first time that phosphorylation of TACE at serine/threonine residues by tobacco smoke induces amphiregulin release and EGFR activation. TACE phosphorylation is triggered in smoke-exposed lung cells by the ROS-induced activation of PKC through the action of SRC kinase. Furthermore, we identified PKCε as the PKC isoform involved in smoke-induced TACE activation and hyperproliferation of lung cells. CONCLUSIONS Our data elucidate new signaling paradigms by which tobacco smoke promotes TACE activation and hyperproliferation of lung cells.
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Affiliation(s)
- Hassan Lemjabbar-Alaoui
- Thoracic Oncology Laboratory, Department of Surgery, Comprehensive Cancer Center, University of California San Francisco, San Francisco, California, United States of America.
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Wink DA, Hines HB, Cheng RYS, Switzer CH, Flores-Santana W, Vitek MP, Ridnour LA, Colton CA. Nitric oxide and redox mechanisms in the immune response. J Leukoc Biol 2011; 89:873-91. [PMID: 21233414 DOI: 10.1189/jlb.1010550] [Citation(s) in RCA: 477] [Impact Index Per Article: 36.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022] Open
Abstract
The role of redox molecules, such as NO and ROS, as key mediators of immunity has recently garnered renewed interest and appreciation. To regulate immune responses, these species trigger the eradication of pathogens on the one hand and modulate immunosuppression during tissue-restoration and wound-healing processes on the other. In the acidic environment of the phagosome, a variety of RNS and ROS is produced, thereby providing a cauldron of redox chemistry, which is the first line in fighting infection. Interestingly, fluctuations in the levels of these same reactive intermediates orchestrate other phases of the immune response. NO activates specific signal transduction pathways in tumor cells, endothelial cells, and monocytes in a concentration-dependent manner. As ROS can react directly with NO-forming RNS, NO bioavailability and therefore, NO response(s) are changed. The NO/ROS balance is also important during Th1 to Th2 transition. In this review, we discuss the chemistry of NO and ROS in the context of antipathogen activity and immune regulation and also discuss similarities and differences between murine and human production of these intermediates.
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Affiliation(s)
- David A Wink
- Radiation Biology Branch, National Cancer Institute/National Institutes of Health, Bethesda, MD 20892, USA.
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Baker SS, Baker RD, Liu W, Nowak NJ, Zhu L. Role of alcohol metabolism in non-alcoholic steatohepatitis. PLoS One 2010; 5:e9570. [PMID: 20221393 PMCID: PMC2833196 DOI: 10.1371/journal.pone.0009570] [Citation(s) in RCA: 125] [Impact Index Per Article: 8.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/24/2009] [Accepted: 02/15/2010] [Indexed: 12/22/2022] Open
Abstract
Background Non-alcoholic steatohepatitis (NASH) is a serious form of non-alcoholic fatty liver disease (NAFLD), associated with obesity and insulin resistance. Previous studies suggested that intestinal bacteria produced more alcohol in obese mice than lean animals. Methodology/Principal Findings To investigate whether alcohol is involved in the pathogenesis of NASH, the expression of inflammation, fibrosis and alcohol metabolism related genes in the liver tissues of NASH patients and normal controls (NCs) were examined by microarray (NASH, n = 7; NC, n = 4) and quantitative real-time PCR (NASH, n = 6; NC, n = 6). Genes related to liver inflammation and fibrosis were found to be elevated in NASH livers compared to normal livers. The most striking finding is the increased gene transcription of alcohol dehydrogenase (ADH) genes, genes for catalase and cytochrome P450 2E1, and aldehyde dehydrogenase genes. Immunoblot analysis confirmed the increased expression of ADH1 and ADH4 in NASH livers (NASH, n = 9; NC, n = 4). Conclusions/Significance The augmented activity of all the available genes of the pathways for alcohol catabolism suggest that 1) alcohol concentration was elevated in the circulation of NASH patients; 2) there was a high priority for the NASH livers to scavenge alcohol from the circulation. Our data is the first human evidence that suggests alcohol may contribute to the development of NAFLD.
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Affiliation(s)
- Susan S. Baker
- Digestive Diseases and Nutrition Center, Department of Pediatrics, The State University of New York, Buffalo, New York, United States of America
| | - Robert D. Baker
- Digestive Diseases and Nutrition Center, Department of Pediatrics, The State University of New York, Buffalo, New York, United States of America
| | - Wensheng Liu
- Digestive Diseases and Nutrition Center, Department of Pediatrics, The State University of New York, Buffalo, New York, United States of America
| | - Norma J. Nowak
- Department of Biochemistry and the New York State Center of Excellence in Bioinformatics and Life Sciences, The State University of New York at Buffalo, Buffalo, New York, United States of America
- Microarray and Genomics Facility, Roswell Park Cancer Institute, Buffalo, New York, United States of America
| | - Lixin Zhu
- Digestive Diseases and Nutrition Center, Department of Pediatrics, The State University of New York, Buffalo, New York, United States of America
- * E-mail:
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Han IH, Goo SY, Park SJ, Hwang SJ, Kim YS, Yang MS, Ahn MH, Ryu JS. Proinflammatory cytokine and nitric oxide production by human macrophages stimulated with Trichomonas vaginalis. THE KOREAN JOURNAL OF PARASITOLOGY 2009; 47:205-12. [PMID: 19724692 DOI: 10.3347/kjp.2009.47.3.205] [Citation(s) in RCA: 40] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/28/2009] [Revised: 08/03/2009] [Accepted: 08/05/2009] [Indexed: 01/02/2023]
Abstract
Trichomonas vaginalis commonly causes vaginitis and perhaps cervicitis in women and urethritis in men and women. Macrophages are important immune cells in response to T. vaginalis infection. In this study, we investigated whether human macrophages could be involved in inflammation induced by T. vaginalis. Human monocyte-derived macrophages (HMDM) were co-cultured with T. vaginalis. Live, opsonized-live trichomonads, and T. vaginalis lysates increased proinflammatory cytokines, such as TNF-alpha, IL-1beta, and IL-6 by HMDM. The involvement of nuclear factor (NF)-kappaB signaling pathway in cytokine production induced by T. vaginalis was confirmed by phosphorylation and nuclear translocation of p65 NF-kappaB. In addition, stimulation with live T. vaginalis induced marked augmentation of nitric oxide (NO) production and expression of inducible NO synthase (iNOS) levels in HMDM. However, trichomonad-induced NF-kappaB activation and TNF-alpha production in macrophages were significantly inhibited by inhibition of iNOS levels with L-NMMA (NO synthase inhibitor). Moreover, pretreatment with NF-kappaB inhibitors (PDTC or Bay11-7082) caused human macrophages to produce less TNF-alpha. These results suggest that T. vaginalis stimulates human macrophages to produce proinflammatory cytokines, such as IL-1, IL-6, and TNF-alpha, and NO. In particular, we showed that T. vaginalis induced TNF-alpha production in macrophages through NO-dependent activation of NF-kappaB, which might be closely involved in inflammation caused by T. vaginalis.
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Affiliation(s)
- Ik-Hwan Han
- Department of Environmental Biology & Medical Parasitology, Hanyang University College of Medicine, Seoul, Korea
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Horiuchi K, Morioka H, Takaishi H, Akiyama H, Blobel CP, Toyama Y. Ectodomain shedding of FLT3 ligand is mediated by TNF-alpha converting enzyme. THE JOURNAL OF IMMUNOLOGY 2009; 182:7408-14. [PMID: 19494263 DOI: 10.4049/jimmunol.0801931] [Citation(s) in RCA: 26] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
Abstract
FLT3 ligand (FLT3L) has diverse roles in the hematopoietic system, which include stimulating proliferation of hematopoietic precursors and development of NK cells and dendritic cells. FLT3L is initially synthesized as a membrane-bound protein, which must be cleaved to become a soluble growth factor. However, little is known about the enzyme involved in the proteolytic release of FLT3L. In the current study, we show that shedding of FLT3L is metalloprotease-dependent, and that this proteolytic activity was abolished in fibroblasts lacking TNF-alpha converting enzyme (TACE) and could be rescued by reintroducing wild-type TACE in these cells. Moreover, we found that cells derived from the thymus of conditional TACE-deficient mice produce less FLT3L, and that serum FLT3L levels in these TACE mutant mice are significantly lower, both after LPS treatment and in the absence of such a challenge, further corroborating the relevance of TACE as FLT3L sheddase in vivo. Considering the involvements of FLT3 and FLT3L in hematopoietic malignancies and stem cell mobilization, the identification of the enzyme involved in FLT3L shedding may have important clinical implications.
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Affiliation(s)
- Keisuke Horiuchi
- Department of Anti-aging Orthopedic Research, Keio University, School of Medicine, Shinjuku-ku, Tokyo, Japan.
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Wang Y, Herrera AH, Li Y, Belani KK, Walcheck B. Regulation of mature ADAM17 by redox agents for L-selectin shedding. THE JOURNAL OF IMMUNOLOGY 2009; 182:2449-57. [PMID: 19201900 DOI: 10.4049/jimmunol.0802770] [Citation(s) in RCA: 104] [Impact Index Per Article: 6.9] [Reference Citation Analysis] [Abstract] [Subscribe] [Scholar Register] [Indexed: 02/02/2023]
Abstract
L-selectin is constitutively expressed by neutrophils and plays a key role in directing these cells to sites of inflammation. Upon neutrophil activation, L-selectin is rapidly and efficiently down-regulated from the cell surface by ectodomain shedding. We have directly shown that A disintegrin and metalloprotease 17 (ADAM17) is a primary and nonredundant sheddase of L-selection by activated neutrophils in vivo. Following cell activation, intracellular signals lead to the induction of ADAM17's enzymatic activity; however, the target of this inducer mechanism remains unclear. Our study provides evidence of an activation mechanism that involves the extracellular region of the mature form of cell surface ADAM17 and not its intracellular region. We demonstrate that the catalytic activity of purified ADAM17 lacking a prodomain and its intracellular region is diminished under mild reducing conditions by DTT and enhanced by H(2)O(2) oxidation. Moreover, H(2)O(2) reversed ADAM17 inhibition by DTT. The treatment of neutrophils with H(2)O(2) also induced L-selectin shedding in an ADAM17-dependent manner. These findings suggest that thiol-disulfide conversion occurring in the extracellular region of ADAM17 may be involved in its activation. An analysis of ADAM17 revealed that within its disintegrin/cysteine-rich region are two highly conserved, vicinal cysteine sulfhydryl motifs (cysteine-X-X-cysteine), which are well-characterized targets for thiol-disulfide exchange in various other proteins. Using a cell-based ADAM17 reconstitution assay, we demonstrate that the cysteine-X-X-cysteine motifs are critical for L-selectin cleavage. Taken together, our findings suggest that reduction-oxidation modifications of cysteinyl sulfhydryl groups in mature ADAM17 may serve as a mechanism for regulating the shedding of L-selectin following neutrophil stimulation.
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Affiliation(s)
- Yue Wang
- Department of Veterinary and Biomedical Sciences, University of Minnesota, St. Paul, MN 55108, USA
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Murillo-Carretero M, Torroglosa A, Castro C, Villalobo A, Estrada C. S-Nitrosylation of the epidermal growth factor receptor: a regulatory mechanism of receptor tyrosine kinase activity. Free Radic Biol Med 2009; 46:471-9. [PMID: 19056486 DOI: 10.1016/j.freeradbiomed.2008.10.048] [Citation(s) in RCA: 42] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/24/2008] [Revised: 10/10/2008] [Accepted: 10/24/2008] [Indexed: 11/17/2022]
Abstract
Nitric oxide (NO) donors inhibit the epidermal growth factor (EGF)-dependent auto(trans)phosphorylation of the EGF receptor (EGFR) in several cell types in which NO exerts antiproliferative effects. We demonstrate in this report that NO inhibits, whereas NO synthase inhibition potentiates, the EGFR tyrosine kinase activity in NO-producing cells, indicating that physiological concentrations of NO were able to regulate the receptor activity. Depletion of intracellular glutathione enhanced the inhibitory effect of the NO donor 1,1-diethyl-2-hydroxy-2-nitrosohydrazine (DEA/NO) on EGFR tyrosine kinase activity, supporting the notion that such inhibition was a consequence of an S-nitrosylation reaction. Addition of DEA/NO to cell lysates resulted in the S-nitrosylation of a large number of proteins including the EGFR, as confirmed by the chemical detection of nitrosothiol groups in the immunoprecipitated receptor. We prepared a set of seven EGFR(C --> S) substitution mutants and demonstrated in transfected cells that the tyrosine kinase activity of the EGFR(C166S) mutant was completely resistant to NO, whereas the EGFR(C305S) mutant was partially resistant. In the presence of EGF, DEA/NO significantly inhibited Akt phosphorylation in cells transfected with wild-type EGFR, but not in those transfected with C166S or C305S mutants. We conclude that the EGFR can be posttranslationally regulated by reversible S-nitrosylation of C166 and C305 in living cells.
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McCarthy SM, Bove PF, Matthews DE, Akaike T, van der Vliet A. Nitric oxide regulation of MMP-9 activation and its relationship to modifications of the cysteine switch. Biochemistry 2008; 47:5832-40. [PMID: 18452312 DOI: 10.1021/bi702496v] [Citation(s) in RCA: 48] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/08/2023]
Abstract
Matrix metalloproteases (MMPs) are Zn-containing endopeptidases involved in the degradation of extracellular matrix components and are typically secreted in a latent (pro-MMP) form and activated either by proteolytic or oxidative disruption of a conserved cysteine switch. Several recent studies have suggested that nitric oxide (NO) can contribute to the activation of MMPs, but the mechanisms involved are incompletely understood. We investigated the ability of NO to regulate the activation of (pro)MMP-9 using a variety of NO-donor compounds and characterized modifications of the cysteine switch using a synthetic peptide (PRCGVPDLGR) representing the cysteine switch domain of MMP-9. Among the NO-donors used, only S-nitrosocysteine (SNOC) was found to be capable of modest activation of proMMP-9, but S-nitrosoglutathione (GSNO) or the NONOates, DEA-NO, SPER-NO, or DETA-NO, were ineffective. In fact, high concentrations of DETA-NO were found to inhibit MMP-9 activity, presumably by direct interaction with the active-site Zn (2+). Analysis of chemical modifications within the Cys-containing peptide, PRCGVPDLGR, revealed rapid and transient S-nitrosylation by SNOC and GSNO, and formation of mixed disulfides and dimerized peptide as major final products. Similarly, NONOates induced transient S-nitrosylation and primarily peptide dimerization. Coordination of the peptide Cys with a synthetic Zn (2+) complex, to more closely mimic the structure of the active site in proMMP-9, reduced peptide nitrosylation and oxidation by NONOates, but enhanced peptide nitrosylation by SNOC and GSNO. Collectively, our results demonstrate that NO is incapable of directly activating proMMP-9 and that S-nitrosylation of MMP-9 propeptide by NO-donors is unrelated to their ability to regulate MMP-9 activity.
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Affiliation(s)
- Sean M McCarthy
- Department of Pathology, University of Vermont, Burlington, Vermont 05405, USA
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35
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Booth BW, Sandifer T, Martin EL, Martin LD. IL-13-induced proliferation of airway epithelial cells: mediation by intracellular growth factor mobilization and ADAM17. Respir Res 2007; 8:51. [PMID: 17620132 PMCID: PMC1976612 DOI: 10.1186/1465-9921-8-51] [Citation(s) in RCA: 37] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/23/2006] [Accepted: 07/09/2007] [Indexed: 11/10/2022] Open
Abstract
BACKGROUND The pleiotrophic cytokine interleukin (IL)-13 features prominently in allergic and inflammatory diseases. In allergic asthma, IL-13 is well established as an inducer of airway inflammation and tissue remodeling. We demonstrated previously that IL-13 induces release of transforming growth factor-alpha (TGFalpha) from human bronchial epithelial cells, with proliferation of these cells mediated by the autocrine/paracrine action of this growth factor. TGFalpha exists as an integral membrane protein and requires proteolytic processing to its mature form, with a disintegrin and metalloproteinase (ADAM)17 responsible for this processing in a variety of tissues. METHODS In this study, normal human bronchial epithelial (NHBE) cells grown in air/liquid interface (ALI) culture were used to examine the mechanisms whereby IL-13 induces release of TGFalpha and cellular proliferation. Inhibitors and antisense RNA were used to examine the role of ADAM17 in these processes, while IL-13-induced changes in the intracellular expression of TGFalpha and ADAM17 were visualized by confocal microscopy. RESULTS IL-13 was found to induce proliferation of NHBE cells, and release of TGFalpha, in an ADAM17-dependent manner; however, this IL-13-induced proliferation did not appear to result solely from ADAM17 activation. Rather, IL-13 induced a change in the location of TGFalpha expression from intracellular to apical regions of the NHBE cells. The apical region was also found to be a site of significant ADAM17 expression, even prior to IL-13 stimulation. CONCLUSION Results from this study indicate that ADAM17 mediates IL-13-induced proliferation and TGFalpha shedding in NHBE cells. Furthermore, they provide the first example wherein a cytokine (IL-13) induces a change in the intracellular expression pattern of a growth factor, apparently inducing redistribution of intracellular stores of TGFalpha to the apical region of NHBE cells where expression of ADAM17 is prominent. Thus, IL-13-induced, ADAM17-mediated release of TGFalpha, and subsequent epithelial cell proliferation, could contribute to the epithelial hypertrophy, as well as other features, associated with airway remodeling in allergic asthma.
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Affiliation(s)
- Brian W Booth
- Department of Molecular Biomedical Sciences, North Carolina State University, Raleigh, NC, USA
- Mammary Biology and Tumorigenesis Laboratory, National Cancer Institute, National Institutes of Health, Bethesda, MD, USA
| | - Tracy Sandifer
- Department of Molecular Biomedical Sciences, North Carolina State University, Raleigh, NC, USA
- Department of Epidemiology, School of Public Health and Community Medicine, University of Washington, Seattle, WA, USA
| | - Erika L Martin
- Department of Molecular Biomedical Sciences, North Carolina State University, Raleigh, NC, USA
| | - Linda D Martin
- Department of Molecular Biomedical Sciences, North Carolina State University, Raleigh, NC, USA
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Stevanin TM, Laver JR, Poole RK, Moir JWB, Read RC. Metabolism of nitric oxide by Neisseria meningitidis modifies release of NO-regulated cytokines and chemokines by human macrophages. Microbes Infect 2007; 9:981-7. [PMID: 17544805 DOI: 10.1016/j.micinf.2007.04.002] [Citation(s) in RCA: 33] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/15/2006] [Revised: 03/16/2007] [Accepted: 04/02/2007] [Indexed: 11/19/2022]
Abstract
Macrophages produce nitric oxide (NO) via the inducible nitric oxide synthase as part of a successful response to infection. The gene norB of Neisseria meningitidis encodes a NO reductase which enables utilization and consumption of NO during microaerobic respiration and confers resistance to nitrosative stress-related killing by human monocyte-derived macrophages (MDM). In this study we confirmed that NO regulates cytokine and chemokine release by resting MDM: accumulation of TNF-alpha, IL-12, IL-10, CCL5 (RANTES) and CXCL8 (IL-8) in MDM supernatants was significantly modified by the NO-donor S-nitroso-N-penicillamine (SNAP). Using a protein array, infection of MDM with N. meningitidis was shown to be associated with secretion of a wide range of cytokines and chemokines. To test whether NO metabolism by N. meningitidis modifies release of NO-regulated cytokines, we infected MDM with wild-type organisms and an isogenic norB strain. Resulting expression of the cytokines TNF-alpha and IL-12, and the chemokine CXCL8 was increased and production of the cytokine IL-10 and the chemokine CCL5 was decreased in norB-infected MDM, in comparison to wild-type. Addition of SNAP to cultures infected with wild-type mimicked the effect observed in cultures infected with the norB mutant. In conclusion, NorB-catalysed removal of NO modifies cellular release of NO-regulated cytokines and chemokines.
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Affiliation(s)
- Tânia M Stevanin
- Academic Unit of Infection and Immunity, School of Medicine and Biomedical Sciences, University of Sheffield, Royal Hallamshire Hospital, Sheffield, S10 2RX, UK.
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Zhan M, Jin B, Chen SE, Reecy JM, Li YP. TACE release of TNF-alpha mediates mechanotransduction-induced activation of p38 MAPK and myogenesis. J Cell Sci 2007; 120:692-701. [PMID: 17264149 PMCID: PMC3099537 DOI: 10.1242/jcs.03372] [Citation(s) in RCA: 71] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022] Open
Abstract
Skeletal muscle responds to mechanical stimulation by activating p38 MAPK, a key signal for myogenesis. However, the mechanotransduction mechanism that activates p38 is unknown. Here we show that mechanical stimulation of myoblasts activates p38 and myogenesis through stimulating TNF-alpha release by TNF-alpha converting enzyme (TACE). In C2C12 or mouse primary myoblasts cultured in growth medium, static stretch activated p38 along with ERK1/2, JNK and AKT. Disrupting TNF-alpha signaling by TNF-alpha-neutralizing antibody or knocking out TNF-alpha receptors blocked stretch activation of p38, but not ERK1/2, JNK or AKT. Stretch also activated differentiation markers MEF2C, myogenin, p21 and myosin heavy chain in a TNF-alpha- and p38-dependent manner. Stretch stimulated the cleavage activity of TACE. Conversely, TACE inhibitor TAPI or TACE siRNA abolished stretch activation of p38. In addition, conditioned medium from stretched myoblast cultures activated p38 in unstretched myoblasts, which required TACE activity in the donor myoblasts, and TNF-alpha receptors in the recipient myoblasts. These results indicate that posttranscriptional activation of TACE mediates the mechanotransduction that activates p38-dependent myogenesis via the release of TNF-alpha.
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Affiliation(s)
- Mei Zhan
- Department of Medicine, Baylor College of Medicine, One Baylor Plaza-520B, Houston, TX 77030, USA
| | - Bingwen Jin
- Department of Medicine, Baylor College of Medicine, One Baylor Plaza-520B, Houston, TX 77030, USA
| | - Shuen-Ei Chen
- Department of Medicine, Baylor College of Medicine, One Baylor Plaza-520B, Houston, TX 77030, USA
| | - James M. Reecy
- Department of Animal Science, Iowa State University, Ames, IA 50011, USA
| | - Yi-Ping Li
- Department of Medicine, Baylor College of Medicine, One Baylor Plaza-520B, Houston, TX 77030, USA
- Author for correspondence ()
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Tellier E, Canault M, Rebsomen L, Bonardo B, Juhan-Vague I, Nalbone G, Peiretti F. The shedding activity of ADAM17 is sequestered in lipid rafts. Exp Cell Res 2006; 312:3969-80. [PMID: 17010968 DOI: 10.1016/j.yexcr.2006.08.027] [Citation(s) in RCA: 117] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/27/2006] [Revised: 08/28/2006] [Accepted: 08/31/2006] [Indexed: 11/24/2022]
Abstract
The tumor necrosis factor-alpha (TNF) converting enzyme (ADAM17) is a metalloprotease-disintegrin responsible for the cleavage of several biologically active transmembrane proteins. However, the substrate specificity of ADAM17 and the regulation of its shedding activity are still poorly understood. Here, we report that during its transport through the Golgi apparatus, ADAM17 is included in cholesterol-rich membrane microdomains (lipid rafts) where its prodomain is cleaved by furin. Consequently, ADAM17 shedding activity is sequestered in lipid rafts, which is confirmed by the fact that metalloproteinase inhibition increases the proportion of ADAM17 substrates (TNF and its receptors TNFR1 and TNFR2) in lipid rafts. Membrane cholesterol depletion increases the ADAM17-dependent shedding of these substrates demonstrating the importance of lipid rafts in the control of this process. Furthermore, ADAM17 substrates are present in different proportions in lipid rafts, suggesting that the entry of each of these substrates in these particular membrane microdomains is specifically regulated. Our data support the idea that one of the mechanisms regulating ADAM17 substrate cleavage involves protein partitioning in lipid rafts.
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Abstract
Zinc/cysteine coordination environments in proteins are redox-active. Oxidation of the sulfur ligands mobilizes zinc, while reduction of the oxidized ligands enhances zinc binding, providing redox control over the availability of zinc ions. Some zinc proteins are redox sensors, in which zinc release is coupled to conformational changes that control varied functions such as enzymatic activity, binding interactions, and molecular chaperone activity. Whereas the released zinc ion in redox sensors has no known function, the redox signal is transduced to specific and sensitive zinc signals in redox transducers. Released zinc can bind to sites on other proteins and modulate signal transduction, generation of metabolic energy, mitochondrial function, and gene expression. The paradigm of such redox transducers is the zinc protein metallothionein, which, together with its apoprotein, thionein, functions at a central node in cellular signaling by redistributing cellular zinc, presiding over the availability of zinc, and interconverting redox and zinc signals. In this regard, the transduction of nitric oxide (NO) signals into zinc signals by metallothionein has received particular attention. It appears that redox-inert zinc has been chosen to control some aspects of cellular thiol/disulfide redox metabolism. Tight control of zinc is essential for redox homeostasis because both increases and decreases of cellular zinc elicit oxidative stress. Depending on its availability, zinc can be cytoprotective as a pro-antioxidant or cytotoxic as a pro-oxidant. Any condition with acute or chronic oxidative stress is expected to perturb zinc homeostasis.
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Affiliation(s)
- Wolfgang Maret
- Department of Preventive Medicine and Community Health, University of Texas Medical Branch, Galveston, 77555, USA.
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Alvarez-Iglesias M, Wayne G, O'Dea KP, Amour A, Takata M. Continuous real-time measurement of tumor necrosis factor-alpha converting enzyme activity on live cells. J Transl Med 2005; 85:1440-8. [PMID: 16127421 DOI: 10.1038/labinvest.3700340] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022] Open
Abstract
Tumor necrosis factor-alpha (TNF) converting enzyme (TACE) is responsible for shedding of various membrane proteins including proinflammatory cytokine TNF. In vivo regulation of TACE is poorly understood mainly due to lack of reliable methodology to measure TACE activity in cell-based assays. Here we report a novel enzyme assay that enables continuous real-time measurement of TACE activity on the surface of live cells. Cells were incubated with a new fluorescent resonance energy transfer peptide consisting of a TACE-sensitive TNF sequence and fluorescein-tetramethylrhodamine (FAM-TAMRA), and enzyme activity was monitored by the rate of increase in fluorescent signal due to peptide cleavage. Validation studies using resting as well as stimulated monocytic cells indicated that the assay was sensitive, reproducible and quantitative. Pharmacological studies with various inhibitors indicated that the observed enzyme activity could largely be ascribed to TACE. Thus, the FAM-TAMRA peptide provides a powerful tool for measurement of constitutive and inducible cellular TACE activity. The principles developed may be applied to analyses of enzyme activity of various sheddases on live cells.
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Affiliation(s)
- Montserrat Alvarez-Iglesias
- Department of Anaesthetics and Intensive Care, Faculty of Medicine, Imperial College London, Chelsea and Westminster Hospital, London, UK
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Hess DT, Matsumoto A, Kim SO, Marshall HE, Stamler JS. Protein S-nitrosylation: purview and parameters. Nat Rev Mol Cell Biol 2005; 6:150-66. [PMID: 15688001 DOI: 10.1038/nrm1569] [Citation(s) in RCA: 1585] [Impact Index Per Article: 83.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Abstract
S-nitrosylation, the covalent attachment of a nitrogen monoxide group to the thiol side chain of cysteine, has emerged as an important mechanism for dynamic, post-translational regulation of most or all main classes of protein. S-nitrosylation thereby conveys a large part of the ubiquitous influence of nitric oxide (NO) on cellular signal transduction, and provides a mechanism for redox-based physiological regulation.
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Affiliation(s)
- Douglas T Hess
- Department of Medicine, Duke University Medical Center, Durham, North Carolina 27710, USA
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Franchimont N, Lambert C, Huynen P, Ribbens C, Relic B, Chariot A, Bours V, Piette J, Merville MP, Malaise M. Interleukin-6 receptor shedding is enhanced by interleukin-1? and tumor necrosis factor ? and is partially mediated by tumor necrosis factor ?-converting enzyme in osteoblast-like cells. ACTA ACUST UNITED AC 2005; 52:84-93. [PMID: 15641051 DOI: 10.1002/art.20727] [Citation(s) in RCA: 34] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/14/2023]
Abstract
OBJECTIVE Interleukin-6 (IL-6) and soluble IL-6 receptor (sIL-6R) activation of gp130 represents an alternative pathway for osteoclast development in inflammatory conditions. The goal of the present study was to investigate changes in sIL-6R levels in response to the inflammatory cytokines IL-1beta and tumor necrosis factor alpha (TNFalpha) and to determine the role of TNFalpha-converting enzyme (TACE) in this process. METHODS Levels of sIL-6R in the culture media of MG63 and SAOS-2 osteoblast-like cell lines after exposure to various agents were determined by immunoassay. TACE protein levels were measured by Western immunoblotting. Cells were transfected with small interfering RNA (siRNA) or with an expression plasmid for IL-6R and TACE to determine the potential involvement of TACE in IL-6R shedding. RESULTS IL-1beta and TNFalpha increased the levels of sIL-6R in the culture media of MG63 osteoblast-like cells. This effect was not influenced by cycloheximide or 5,6-dichlorobenzimidazole riboside but was markedly inhibited by the calcium chelator EGTA and by the TACE and matrix metalloproteinase inhibitor hydroxamate (Ru36156). IL-1beta and TNFalpha had no influence on the alternatively spliced form of IL-6R RNA. Levels of sIL-6R were reduced when MG63 cells were transiently transfected with TACE siRNA. Transfection of SAOS-2 cells with expression plasmids for IL-6R and TACE produced a dose-dependent increase in sIL-6R levels. CONCLUSION IL-1beta- and TNFalpha-mediated induction of IL-6R shedding in osteoblast-like cells is at least partly dependent on TACE activation.
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Affiliation(s)
- Nathalie Franchimont
- Center for Cellular and Molecular Therapy, University of Liège, Centre Hospitalier Universitaire Sart-Tilman, 4000 Liege, Belgium.
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Zhao XJ, Oliver P, Song K, Schurr J, Zhang Z, Kolls JK. Chronic ethanol enhances ectodomain shedding in T cells and monocytes. Alcohol Clin Exp Res 2004; 28:1399-407. [PMID: 15365312 DOI: 10.1097/01.alc.0000139819.46514.06] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
Abstract
BACKGROUND Chronic ethanol (EtOH) has been shown to augment tumor necrosis factor (TNF)-alpha production, and this has been associated with EtOH-induced liver injury. We have recently described a chronic in vitro cell culture model where chronic ethanol exposure results in significantly augmented TNF production in Mono Mac 6 cells, a human monocytic cell line. This enhanced TNF production was redox regulated and associated with increased levels of TNF messenger RNA (mRNA) as well as increased processing of TNF by TNF converting enzyme (TACE), the enzymatic activity of which is regulated by the cellular redox state. We hypothesized that chronic ethanol through oxidative stress activates TACE-mediated ectodomain shedding of the preformed substrates p75 and p55 TNF receptors in Mono Mac 6 cells and L-selectin in Jurkat T cells. METHODS Mono Mac 6 or Jurkat T cells were treated with EtOH (0, 50, or 100 mM) for 4 to 6 days. Shedding of p75 and p55 TNF receptors (Mono Mac 6 cells) or L-selectin (Jurkat T cells) was induced by stimulation with lipopolysaccharide and phorbol myristate acetate for Mono Mac 6 cells and PMA alone for Jurkat T cells. Shedding was assessed by enzyme-linked immunosorbent assay for shed molecules in the cell supernatant as well as the cell-associated proteins recovered from cell pellets. Steady-state mRNA levels for p75 TNF receptor and L-selectin were determined by ribonuclease protection assay. Cell surface L-selectin and TACE were measured by flow cytometry, and cell associated p55 and p75 TNF receptors were measured by enzyme-linked immunosorbent assay. RESULTS Chronic EtOH exposure for 6 days resulted in a significant dose-dependent increase in shedding of p75 and p55 TNF receptors from Mono Mac 6 cells and L-selectin from Jurkat T-cells. The enhanced shedding was correlated with an alcohol-induced increase in mRNA levels and cell surface protein levels for these TACE substrates. Although chronic EtOH exposure increased the total amount of p75 and p55 TNF receptor and L-selectin shed into the media, the efficiency of shedding was suppressed by EtOH. In the case of Mono Mac 6 cells, the EtOH exposure increased superoxide production. Inhibition of nicotinamide adenine dinucleotide phosphate (reduced form) oxidase and hydrogen peroxide partially prevented the increased production of p75 TNF receptor in these cells. CONCLUSIONS These results suggest that chronic EtOH up-regulates p75 and p55 TNF receptors on monocytes and L-selectin on T-cells. However, the TACE-mediated shedding efficiency of these substrates may be inhibited in the presence of EtOH. These results may have implications in monocyte signaling and T-cell trafficking, which may, in part, contribute to immune dysregulation associated with chronic ethanol.
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Affiliation(s)
- Xue-Jun Zhao
- Department of Pediatrics, University of Pittsburgh, Children's Hospital of Pittsburgh, Pittsburgh, PA 15213, USA
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Abstract
Soluble cytokine receptors regulate inflammatory and immune events by functioning as agonists or antagonists of cytokine signaling. As such, they act within complex receptor systems that include signaling receptors, nonsignaling decoy receptors, receptor-associated proteins, and soluble receptor antagonists. Soluble cytokine receptors can be generated by several mechanisms, which include proteolytic cleavage of receptor ectodomains, alternative splicing of mRNA transcripts, transcription of distinct genes that encode soluble cytokine-binding proteins, release of full-length receptors within the context of exosome-like vesicles, and cleavage of GPI-anchored receptors. Furthermore, the important role of soluble cytokine receptors in regulating host defense mechanisms is evidenced by viruses that encode soluble homologues of mammalian receptors and thereby evade innate host immune responses via the sequestration of essential cytokines.
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Affiliation(s)
- Stewart J Levine
- Pulmonary-Critical Care Medicine Branch, National Heart, Lung, and Blood Institute, National Institutes of Health, Bethesda, MD 20892, USA.
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Vitarbo EA, Chatzipanteli K, Kinoshita K, Truettner JS, Alonso OF, Dietrich WD. Tumor necrosis factor alpha expression and protein levels after fluid percussion injury in rats: the effect of injury severity and brain temperature. Neurosurgery 2004; 55:416-24; discussion 424-5. [PMID: 15271250 DOI: 10.1227/01.neu.0000130036.52521.2c] [Citation(s) in RCA: 96] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/09/2003] [Accepted: 03/24/2004] [Indexed: 11/19/2022] Open
Abstract
OBJECTIVE Tumor necrosis factor alpha (TNFalpha) is elevated in some models of traumatic brain injury (TBI). However, it is unclear how TNFalpha messenger ribonucleic acid (mRNA) expression and protein levels are affected by injury severity and posttraumatic temperature modification. This study determined the regional and temporal profile of TNFalpha levels after moderate and severe TBI and assessed the effects of posttraumatic hypothermia or hyperthermia on this proinflammatory cytokine. METHODS Adult male Sprague-Dawley rats were subjected to sham procedures (no injury), moderate fluid-percussion TBI (1.8-2.2 atm), or severe fluid-percussion TBI (2.4-2.6 atm). After 1 to 72 hours of survival, animals were killed, and brain samples, cerebrospinal fluid, and serum were harvested for enzyme-linked immunosorbent assay quantification of TNFalpha levels. In a subsequent study, a 3-hour period of posttraumatic hypothermia (33 degrees C) or hyperthermia (39.5 degrees C) was applied, followed by immediate killing and cytokine assay. Another group was subjected to moderate TBI (1.8-2.2 atm), followed by killing at 15 minutes or at 1, 3, or 24 hours for TNFalpha reverse transcriptase-polymerase chain reaction analysis. RESULTS A significant increase in TNFalpha mRNA and protein levels in cellular lysates of injured cortex and ipsilateral hippocampus was noted by 1 hour after TBI; it was sustained to 3 hours, followed by a rapid decline. Increased injury severity was associated with increased protein levels at remote injury sites and in the injured cerebral cortex at 72 hours. Posttraumatic hypothermia significantly reduced TNFalpha mRNA expression in the hippocampus compared with that in normothermic rats. In contrast, no temperature effects on TNFalpha protein levels were documented. CONCLUSION Rapid and marked increase in TNFalpha mRNA expression and protein levels follows moderate and severe TBI. Injury severity and posttraumatic temperature play a modest but significant role on TNFalpha expression and protein levels. These findings suggest that the effects of posttraumatic temperature on histopathological and behavioral outcome primarily may involve secondary mediators that do not operate directly through their effect on TNFalpha.
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Affiliation(s)
- Elizabeth A Vitarbo
- Department of Neurological Surgery, The Neurotrauma Research Center, The Miami Project to Cure Paralysis, University of Miami School of Medicine, Miami, Florida 33101, USA.
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Shao MXG, Nakanaga T, Nadel JA. Cigarette smoke induces MUC5AC mucin overproduction via tumor necrosis factor-α-converting enzyme in human airway epithelial (NCI-H292) cells. Am J Physiol Lung Cell Mol Physiol 2004; 287:L420-7. [PMID: 15121636 DOI: 10.1152/ajplung.00019.2004] [Citation(s) in RCA: 182] [Impact Index Per Article: 9.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/09/2023] Open
Abstract
Chronic obstructive pulmonary disease (COPD) is one of the leading causes of death in the U.S. Because cigarette smoking is so importantly implicated in the pathogenesis of COPD and because mucus hypersecretion plays such an important role in COPD, understanding of the mechanisms of smoking-induced mucus hypersecretion could lead to new therapies for COPD. Cigarette smoke causes mucin overproduction via EGF receptor (EGFR) in airway epithelial cells, but the cellular mechanism remains unknown. Airway epithelial cells contain EGFR proligands on their surfaces, which can be cleaved by metalloprotease and subsequently bind to EGFR resulting in mucin production. We hypothesize that TNF-α-converting enzyme (TACE) is activated by cigarette smoke, resulting in increased shedding of EGFR proligand, leading to EGFR phosphorylation and mucin induction in human airway epithelial (NCI-H292) cells. Here we show that cigarette smoke increases MUC5AC production in NCI-H292 cells, an effect that is prevented by an EGFR-neutralizing antibody and by specific knockdown of transforming growth factor-α (TGF-α) using small interfering RNA (siRNA) for TGF-α, implicating TGF-α-dependent EGFR activation in the responses. Cigarette smoke increases TGF-α shedding, EGFR phosphorylation, and mucin production, which are prevented by metalloprotease inhibitors (GM-6001 and TNF-α protease inhibitor-1) and by specific knockdown of TACE with TACE siRNA, implicating TACE in smoking-induced responses. Furthermore, pretreatment with antioxidants prevents smoking-induced TGF-α shedding and mucin production, suggesting that reactive oxygen species is involved in TACE activation. These results implicate TACE in smoking-induced mucin overproduction via the TACE-proligand-EGFR signal pathway in NCI-H292 cells.
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Affiliation(s)
- Matt X G Shao
- Department of Medicine and Physiology, University of California San Francisco, San Francisco, CA 94143-0130, USA
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Bzowska M, Jura N, Lassak A, Black RA, Bereta J. Tumour necrosis factor-α stimulates expression of TNF-α converting enzyme in endothelial cells. ACTA ACUST UNITED AC 2004; 271:2808-20. [PMID: 15206946 DOI: 10.1111/j.1432-1033.2004.04215.x] [Citation(s) in RCA: 47] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Tumor necrosis factor-alpha converting enzyme (ADAM17) is a major metalloproteinase involved in the shedding of several membrane-bound cytokines and cytokine receptors. Interplay of cytokines and their soluble receptors might be an important regulatory element in the network of interactions responsible for maintaining homeostasis in the immune system. ADAM17 thus has the potential to participate in a broad range of immune reactions. We studied the mechanisms of ADAM17 activation in endothelial cells and found that pro-inflammatory cytokines (tumor necrosis factor-alpha, interleukin-1beta, interferon-gamma) and growth factors (epidermal growth factor, vascular endothelial growth factor) are able to upregulate transcription of ADAM17 and expression of ADAM17 protein. This process might constitute an important mechanism of regulation of ADAM17 activity. Stimulation of transcription, rather than increased ADAM17 mRNA stability, was responsible for increased levels of ADAM17 mRNA. Importantly, the increase in ADAM17 was accompanied by increased shedding of TNF-Receptor I (p55) in tumor necrosis factor-alpha-stimulated endothelial cells. Therefore, ADAM17-dependent depletion of membrane-bound tumor necrosis factor receptors from endothelial cells might constitute a mechanism of self-protection in states of prolonged immunostimulation.
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Affiliation(s)
- Monika Bzowska
- Department of Cell Biochemistry, Faculty of Biotechnology, Jagiellonian University, Kraków, Poland
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Begg MJ, Sturrock ED, van der Westhuyzen DR. Soluble LDL-R are formed by cell surface cleavage in response to phorbol esters. ACTA ACUST UNITED AC 2004; 271:524-33. [PMID: 14728679 DOI: 10.1046/j.1432-1033.2003.03953.x] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
Abstract
A 140-kDa soluble form of the low density lipoprotein (LDL) receptor has been isolated from the culture medium of HepG2 cells and a number of other cell types. It is produced from the 160-kDa mature LDL receptor by a proteolytic cleavage, which is stimulated in the presence of 4beta-phorbol 12-myristate 13-acetate (PMA), leading to the release of a soluble fragment that constitutes the bulk of the extracellular domain of the LDL receptor. By labeling HepG2 cells with [35S]methionine and chasing in the presence of PMA, we demonstrated that up to 20% of LDL-receptors were released into the medium in a 2-h period. Simultaneously, the level of labeled cellular receptors was reduced by 30% in those cells treated with PMA compared to untreated cells, as was the total number of cell surface LDL-receptors assayed by the binding of 125I-labeled antibody to whole cells. To determine if endocytosis was required for cleavage, internalization-defective LDL-receptors were created by mutagenesis or deletion of the NPXY internalization signal, transfected into Chinese hamster ovary cells, and assayed for cleavage in the presence and absence of PMA. Cleavage was significantly greater in the case of the mutant receptors than for wild-type receptors, both in the absence and presence of PMA. Similar results were seen in human skin fibroblasts homozygous for each of the internalization-defective LDL receptor phenotypes. LDL receptor cleavage was inhibited by the hydoxamate-based inhibitor TAPI, indicating the resemblance of the LDL receptor cleavage mechanism to that of other surface released membrane proteins.
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Affiliation(s)
- Michael J Begg
- Division of Medical Biochemistry, University of Cape Town, South Africa
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Marshall M, Moore PK. Effect of nitric oxide releasing paracetamol and flurbiprofen on cytokine production in human blood. Eur J Pharmacol 2004; 483:317-22. [PMID: 14729123 DOI: 10.1016/j.ejphar.2003.10.041] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
Abstract
Exposure of anti-coagulated human blood to Escherichia coli lipopolysaccharide (50 ng/ml) resulted in the time-dependent (maximum at 5 h) biosynthesis of interleukin-1beta and tumour necrosis factor-alpha (TNF-alpha). Preincubation with nitroparacetamol or nitroflurbiprofen (but not paracetamol or flurbiprofen) caused dose-related inhibition of the formation of interleukin 1 beta (IC(50)s, 44.5 and 362 microM, n=12) and tumour necrosis factor-alpha (IC(50)s, 9.0 and 0.0009 microM, n=12). The inhibitory effect of nitroparacetamol was completely reversed by (2-(4-carboxyphenyl)-4,4,5,5-tetramethylimidazoline-1-oxyl-3-oxide; 2-(4-carboxyphenyl)-4,5-dihydro-4,4,5,5-tetramethyl-1H-imidazol-1-yloxy-3-oxide potassium (carboxy-PTIO, 100 microM; NO scavenging agent). Neither the nuclear factor-kappaB transduction inhibitor, pyrrolidinedithiocarbamate (10-1000 microM) nor the nitric oxide donor, 1-hydroxy-2-oxo-3-(3-aminopropyl)-3-isopropyl-1-triazene (NOC-5, 10-1000 microM), affected cytokine formation in these experiments.
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Affiliation(s)
- Melanie Marshall
- Department of Pharmacology, King's College, University of London, Guys' Site, Hodgkin Building, London SE1 9RT, UK
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Affiliation(s)
- Joaquín Arribas
- Laboratori de Recerca Oncològica, Servei d'Oncologia Mèdica, Hospital Universitari Vall d'Hebron, Barcelona 08035, Spain
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