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Ospina D, Villegas VE, Rodríguez-Leguizamón G, Rondón-Lagos M. Analyzing biological and molecular characteristics and genomic damage induced by exposure to asbestos. Cancer Manag Res 2019; 11:4997-5012. [PMID: 31239765 PMCID: PMC6556979 DOI: 10.2147/cmar.s205723] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/17/2019] [Accepted: 04/19/2019] [Indexed: 12/24/2022] Open
Abstract
Asbestos is one of the most important occupational carcinogens. Currently, about 125 million people worldwide are exposed to asbestos in the workplace. According to global estimates, at least 107,000 people die each year from lung cancer, mesothelioma, and asbestosis as a result of occupational exposure to asbestos. The high pathogenicity of this material is currently known, being associated with the development of pulmonary diseases, of which lung cancer is the main cause of death due to exposure to this mineral. Pulmonary diseases related to asbestos are a common clinical problem and a major health concern worldwide. Extensive research has identified many important pathogenic mechanisms; however, the precise molecular mechanisms involved, and the generated genomic damage that lead to the development of these diseases, are not completely understood. The modes of action that underlie this type of disease seem to differ depending on the type of fiber, lung clearance, and genetics. This evidences the need to increase our knowledge about these effects on human health. This review focuses on the characteristics of asbestos and the cellular and genomic damage generated in humans via exposure.
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Affiliation(s)
- Diana Ospina
- Biology Program, Faculty of Natural Sciences and Mathematics, Universidad del Rosario, Bogotá 111221,Colombia
| | - Victoria Eugenia Villegas
- Biology Program, Faculty of Natural Sciences and Mathematics, Universidad del Rosario, Bogotá 111221,Colombia
| | - Giovanni Rodríguez-Leguizamón
- Hospital Universitario Mayor Méderi - Universidad del Rosario. School of Medicine and Health Sciences, Universidad del Rosario, Bogotá, 111221, Colombia
| | - Milena Rondón-Lagos
- School of Biological Sciences, Universidad Pedagógica y Tecnológica de Colombia, Tunja 150003, Colombia
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Han B, Shin HJ, Bak IS, Bak Y, Jeong YL, Kwon T, Park YH, Sun HN, Kim CH, Yu DY. Peroxiredoxin I is important for cancer-cell survival in Ras-induced hepatic tumorigenesis. Oncotarget 2018; 7:68044-68056. [PMID: 27517622 PMCID: PMC5356538 DOI: 10.18632/oncotarget.11172] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/11/2016] [Accepted: 07/27/2016] [Indexed: 02/06/2023] Open
Abstract
Peroxiredoxin I (Prx I), an antioxidant enzyme, has multiple functions in human cancer. However, the role of Prx I in hepatic tumorigenesis has not been characterized. Here we investigated the relevance and underlying mechanism of Prx I in hepatic tumorigenesis. Prx I increased in tumors of hepatocellular carcinoma (HCC) patients that aligned with overexpression of oncogenic H-ras. Prx I also increased in H-rasG12V transfected HCC cells and liver tumors of H-rasG12V transgenic (Tg) mice, indicating that Prx I may be involved in Ras-induced hepatic tumorigenesis. When Prx I was knocked down or deleted in HCC-H-rasG12V cells or H-rasG12V Tg mice, cell colony or tumor formation was significantly reduced that was associated with downregulation of pERK pathway as well as increased intracellular reactive oxygen species (ROS) induced DNA damage and cell death. Overexpressing Prx I markedly increased Ras downstream pERK/FoxM1/Nrf2 signaling pathway and inhibited oxidative damage in HCC cells and H-rasG12V Tg mice. In this study, we found Nrf2 was transcriptionally activated by FoxM1, and Prx I was activated by the H-rasG12V/pERK/FoxM1/Nrf2 pathway and suppressed ROS-induced hepatic cancer-cell death along with formation of a positive feedback loop with Ras/ERK/FoxM1/Nrf2 to promote hepatic tumorigenesis.
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Affiliation(s)
- Bing Han
- Genome Editing Research Center, Korea Research Institute of Bioscience and Biotechnology, Daejeon, 305-806, Korea.,Department of Biology, Chungnam National University, Daejeon, 305-764, Korea
| | - Hye-Jun Shin
- Genome Editing Research Center, Korea Research Institute of Bioscience and Biotechnology, Daejeon, 305-806, Korea
| | - In Seon Bak
- Genome Editing Research Center, Korea Research Institute of Bioscience and Biotechnology, Daejeon, 305-806, Korea.,Department of Toxicology Evaluation, Graduate School of Preclinical Laboratory Science, Konyang University, Daejeon, 363-700, Korea
| | - Yesol Bak
- Genome Editing Research Center, Korea Research Institute of Bioscience and Biotechnology, Daejeon, 305-806, Korea.,Department of Bioscience and Biotechnology, Bio/Molecular Informatics Center, Konkuk University, Seoul, 143-701, Korea
| | - Ye-Lin Jeong
- Genome Editing Research Center, Korea Research Institute of Bioscience and Biotechnology, Daejeon, 305-806, Korea.,Department of Animal Biosystem Sciences, Chungnam National University, Daejeon, 305-764, Korea
| | - Taeho Kwon
- Genome Editing Research Center, Korea Research Institute of Bioscience and Biotechnology, Daejeon, 305-806, Korea
| | - Young-Ho Park
- Genome Editing Research Center, Korea Research Institute of Bioscience and Biotechnology, Daejeon, 305-806, Korea
| | - Hu-Nan Sun
- College of Life Science and Biotechnology, Heilongjiang Bayi Agricultural University, Daqing, 163319, China
| | - Cheol-Hee Kim
- Department of Biology, Chungnam National University, Daejeon, 305-764, Korea
| | - Dae-Yeul Yu
- Genome Editing Research Center, Korea Research Institute of Bioscience and Biotechnology, Daejeon, 305-806, Korea
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Kumagai-Takei N, Yamamoto S, Lee S, Maeda M, Masuzzaki H, Sada N, Yu M, Yoshitome K, Nishimura Y, Otsuki T. Inflammatory Alteration of Human T Cells Exposed Continuously to Asbestos. Int J Mol Sci 2018; 19:E504. [PMID: 29419731 PMCID: PMC5855726 DOI: 10.3390/ijms19020504] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/04/2018] [Revised: 02/05/2018] [Accepted: 02/06/2018] [Indexed: 01/03/2023] Open
Abstract
Asbestos is a known carcinogen and exposure can lead to lung cancer and malignant mesothelioma. To examine the effects of asbestos fibers on human immune cells, the human T cell leukemia/lymphoma virus (HTLV)-1 immortalized human T cell line MT-2 was employed. Following continuous exposure to asbestos fibers for more than eight months, MT-2 sublines showed acquisition of resistance to asbestos-induced apoptosis with decreased death signals and increased surviving signals. These sublines showed various characteristics that suggested a reduction in anti-tumor immunity. On the other hand, inflammatory changes such as expression of MMP7, CXCR5, CXCL13 and CD44 was found to be markedly higher in sublines continuously exposed to asbestos compared with original MT-2 cells. All of these molecules contribute to lung inflammation, T and B cell interactions and connections between mesothelial cells and T cells. Thus, further investigation focusing on these molecules may shed light on the role of chronic inflammation caused by asbestos exposure and the occurrence of malignant mesothelioma. Finally, regarding peripheral T cells from healthy donors (HD) and asbestos-exposed patients with pleural plaque (PP) or malignant pleural mesothelioma (MPM), following stimulation of CD4+ T cells, T cells from MPM patients showed reduced potential of interferon (IFN)-γ expression. Moreover, levels of interleukin (IL)-6, one of the most important cytokines in chronic inflammation, in cultured supernatants were higher in PP and MPM patients compared with HD. Overall, asbestos-induced chronic inflammation in the lung as well as the pleural cavity may facilitate the onset of asbestos-induced cancers due to alterations in the interactions among fibers, immune cells such as T and B cells and macrophages, and mesothelial and lung epithelial cells. Further investigations regarding chronic inflammation caused by asbestos fibers may assist in identifying molecular targets for preventive and therapeutic strategies related to the effects of asbestos exposure.
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Affiliation(s)
- Naoko Kumagai-Takei
- Department of Hygiene, Kawasaki Medical School, 577 Matsushima, Kurashiki, Okayama 701-0192, Japan.
| | - Shoko Yamamoto
- Department of Hygiene, Kawasaki Medical School, 577 Matsushima, Kurashiki, Okayama 701-0192, Japan.
| | - Suni Lee
- Department of Hygiene, Kawasaki Medical School, 577 Matsushima, Kurashiki, Okayama 701-0192, Japan.
| | - Megumi Maeda
- Department of Biofunctional Chemistry, Division of Bioscience, Okayama University Graduate School of Natural Science and Technology, 1-1-1 Tsushima-Naka, Kita-Ku, Okayama 700-8530, Japan.
| | - Hidenori Masuzzaki
- Department of Life Science, Faculty of Life and Environmental Science, Prefectural University of Hiroshima, Shobara, Hiroshima 727-0023, Japan.
| | - Nagisa Sada
- Department of Hygiene, Kawasaki Medical School, 577 Matsushima, Kurashiki, Okayama 701-0192, Japan.
- Department of Biophysical Chemistry, Graduate School of Medicine, Dentistry and Pharmaceutical Sciences, Okayama University, Okayama 700-8530, Japan.
| | - Min Yu
- Department of Hygiene, Kawasaki Medical School, 577 Matsushima, Kurashiki, Okayama 701-0192, Japan.
- Department of Occupational and Environmental Health Science, School of Public Health, Peking University, 38 Xueyuan Road, Beijing 100191, China.
- Department of Occupational Diseases, Zhejiang, Academy of Medical Sciences, 182 Tian Mu Shan Road, Zhejiang 310013, China.
| | - Kei Yoshitome
- Department of Hygiene, Kawasaki Medical School, 577 Matsushima, Kurashiki, Okayama 701-0192, Japan.
| | - Yasumitsu Nishimura
- Department of Hygiene, Kawasaki Medical School, 577 Matsushima, Kurashiki, Okayama 701-0192, Japan.
| | - Takemi Otsuki
- Department of Biofunctional Chemistry, Division of Bioscience, Okayama University Graduate School of Natural Science and Technology, 1-1-1 Tsushima-Naka, Kita-Ku, Okayama 700-8530, Japan.
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Nuvoli B, Camera E, Mastrofrancesco A, Briganti S, Galati R. Modulation of reactive oxygen species via ERK and STAT3 dependent signalling are involved in the response of mesothelioma cells to exemestane. Free Radic Biol Med 2018; 115:266-277. [PMID: 29229551 DOI: 10.1016/j.freeradbiomed.2017.12.008] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/01/2017] [Revised: 11/23/2017] [Accepted: 12/06/2017] [Indexed: 12/20/2022]
Abstract
Pleural mesothelioma is a deadly form of cancer. The prognosis is extremely poor due to the limited treatment modalities. Uptake of asbestos fibres, the leading cause of mesothelioma, lead to the accumulation of reactive-oxygen-species (ROS). Interestingly, increasing ROS production by using ROS-generating drugs may offer a strategy to selectively trigger cell death. Exemestane, an aromatase inhibitor, has previously shown anti-tumor properties in mesothelioma preclinical models suggesting a role of G protein-coupled receptor 30 (GPR30) in the drug response. As exemestane, in addition to blocking estrogen biosynthesis, generates ROS that are able to arrest the growth of breast cancer, we explored the role of ROS, antioxidant defense system, and ROS-induced signalling pathways in mesothelioma cells during exemestane response. Here we report that exemestane treatment reduced cell proliferation with an increase in ROS production and reduction of cyclic adenosine monophosphate (cAMP) levels in MSTO-H211, Ist-Mes1, Ist-Mes2 and MPP89 exemestane-sensitive mesothelioma cell lines, but not in NCI-H2452 exemestane-insensitive mesothelioma cells. Exemestane induced a significant antioxidant response in NCI-H2452 cells, as highlighted by an increase in γ-glutamylcysteine levels, catalase (Cat), superoxide-dismutase and (SOD) and glutathione-peroxidase (GSH-Px) activity and nuclear factor E2-related factor 2 (Nrf2) activation, responsible for drug insensitivity. Conversely, exemestane elevated ROS levels along with increased ERK phosphorylation and a reduction of p-STA3 in exemestane-sensitive mesothelioma cells. ROS generation was the crucial event of exemestane action because ROS inhibitor N-acetyl-L-cysteine (NAC) abrogated p-ERK and p-STAT3 modulation and cellular death. Exemestane also modulates ERK and STAT3 signalling via GPR30. Results indicate an essential role of ROS in the antiproliferative action of exemestane in mesothelioma cells. It is likely that the additional oxidative insults induced by exemestane results in the lethal effects of mesothelioma cells by increasing ROS production. As such, manipulating ROS levels with exemestane seems to be a feasible strategy to selectively kill mesothelioma cells with less toxicity to normal cells by regulating ERK and STAT3 activity.
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Affiliation(s)
- Barbara Nuvoli
- Preclinical Models and New Therapeutic Agent Unit, Translational Research Functional Departmental Area, Regina Elena National Cancer Institute, Rome 00144, Italy
| | - Emanuela Camera
- Laboratory of Skin Physiopathology and Integrated Centre for Metabolomics San Gallicano Dermatologic Institute (IRCCS), Rome 00144, Italy
| | - Arianna Mastrofrancesco
- Laboratory of Skin Physiopathology and Integrated Centre for Metabolomics San Gallicano Dermatologic Institute (IRCCS), Rome 00144, Italy
| | - Stefania Briganti
- Laboratory of Skin Physiopathology and Integrated Centre for Metabolomics San Gallicano Dermatologic Institute (IRCCS), Rome 00144, Italy
| | - Rossella Galati
- Preclinical Models and New Therapeutic Agent Unit, Translational Research Functional Departmental Area, Regina Elena National Cancer Institute, Rome 00144, Italy.
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Sustained ERK activation-mediated proliferation inhibition of farrerol on human gastric carcinoma cell line by G0/G1-phase cell-cycle arrest. Eur J Cancer Prev 2018; 25:490-9. [PMID: 26656929 DOI: 10.1097/cej.0000000000000212] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
Abstract
Current cancer treatment is partly limited by chemotherapy-induced vascular toxicity associated with damage to vascular endothelial cells. In this study, the cytotoxicity of farrerol against SGC7901 gastric cancer cells and human umbilical vein endothelial cells (HUVECs) in vitro was investigated along with the underlying mechanisms of its growth-inhibitory effect against SGC7901 cells. MTT assays showed that farrerol inhibited SGC7901 cell growth, but exerted no cytotoxicity against HUVECs. Flow cytometry showed that treatment of SGC7901 cells with farrerol (5, 40, or 160 μmol/l) for 24 h caused G0/G1 cell cycle arrest in a concentration-dependent manner. Western blotting indicated that exposure of SGC7901 cells to farrerol resulted in significant upregulation of p27KIP1 (p27), accompanied by sustained activation of ERK1/2 and p38 MAPK instead of JNK. Farrerol-stimulated p27 expression, p38 MAPK activation, and cell growth inhibition were attenuated by pretreatment with U0126, an MEK1/2 inhibitor. In conclusion, this study indicates the selective cytotoxicity of farrerol against SGC7901 cells, but not HUVECs. Furthermore, it provides the first evidence that farrerol could induce cancer cell growth inhibition by G0/G1-phase cell-cycle arrest mediated by sustained ERK activation. The findings show the potential of farrerol as a chemotherapeutic agent without vascular toxicity for use against gastric cancer.
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MacPherson M, Westbom C, Kogan H, Shukla A. Actin polymerization plays a significant role in asbestos-induced inflammasome activation in mesothelial cells in vitro. Histochem Cell Biol 2017; 147:595-604. [PMID: 28013367 PMCID: PMC5401653 DOI: 10.1007/s00418-016-1530-8] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 12/08/2016] [Indexed: 10/20/2022]
Abstract
Asbestos exposure leads to malignant mesothelioma (MM), a deadly neoplasm of mesothelial cells of various locations. Although there is no doubt about the role of asbestos in MM tumorigenesis, mechanisms are still not well explored. Recently, our group demonstrated that asbestos causes inflammasome priming and activation in mesothelial cells, which in part is dependent on oxidative stress. Our current study sheds light on yet another mechanism of inflammasome activation by asbestos. Here we show the role of actin polymerization in asbestos-induced activation of the nod-like receptor pyrin domain-containing protein 3 (NLRP3) inflammasome. Using human mesothelial cells, we first demonstrate that asbestos and carbon nanotubes induced caspase-1 activation and high-mobility group box 1, interleukin 1 beta and interleukin 18 secretion was blocked by Cytochalasin D (Cyto D) an actin polymerization inhibitor. Next, to understand the mechanism, we assessed whether phagocytosis of fibers by mesothelial cells is affected by actin polymerization inhibition. Transmission electron microscopy showed the inhibition of fiber uptake by mesothelial cells in the presence of Cyto D. Furthermore, localization of components of the inflammasome, apoptotic speck-like protein containing a CARD domain (ASC) and NLRP3, to the perinuclear space in mitochondria or endoplasmic reticulum in response to fiber exposure was also interrupted in the presence of Cyto D. Taken together, our studies suggest that actin polymerization plays important roles in inflammasome activation by fibers via regulation of phagocytosis and/or spatial localization of inflammasome components.
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Affiliation(s)
- Maximilian MacPherson
- Department of Pathology and Laboratory Medicine, College of Medicine, University of Vermont, 89 Beaumont Avenue, Burlington, VT, 05405, USA
| | - Catherine Westbom
- Department of Pathology and Laboratory Medicine, College of Medicine, University of Vermont, 89 Beaumont Avenue, Burlington, VT, 05405, USA
| | - Helen Kogan
- Department of Pathology and Laboratory Medicine, College of Medicine, University of Vermont, 89 Beaumont Avenue, Burlington, VT, 05405, USA
| | - Arti Shukla
- Department of Pathology and Laboratory Medicine, College of Medicine, University of Vermont, 89 Beaumont Avenue, Burlington, VT, 05405, USA.
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Kuempel ED, Jaurand MC, Møller P, Morimoto Y, Kobayashi N, Pinkerton KE, Sargent LM, Vermeulen RCH, Fubini B, Kane AB. Evaluating the mechanistic evidence and key data gaps in assessing the potential carcinogenicity of carbon nanotubes and nanofibers in humans. Crit Rev Toxicol 2017; 47:1-58. [PMID: 27537422 PMCID: PMC5555643 DOI: 10.1080/10408444.2016.1206061] [Citation(s) in RCA: 60] [Impact Index Per Article: 8.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/20/2015] [Accepted: 06/22/2016] [Indexed: 12/31/2022]
Abstract
In an evaluation of carbon nanotubes (CNTs) for the IARC Monograph 111, the Mechanisms Subgroup was tasked with assessing the strength of evidence on the potential carcinogenicity of CNTs in humans. The mechanistic evidence was considered to be not strong enough to alter the evaluations based on the animal data. In this paper, we provide an extended, in-depth examination of the in vivo and in vitro experimental studies according to current hypotheses on the carcinogenicity of inhaled particles and fibers. We cite additional studies of CNTs that were not available at the time of the IARC meeting in October 2014, and extend our evaluation to include carbon nanofibers (CNFs). Finally, we identify key data gaps and suggest research needs to reduce uncertainty. The focus of this review is on the cancer risk to workers exposed to airborne CNT or CNF during the production and use of these materials. The findings of this review, in general, affirm those of the original evaluation on the inadequate or limited evidence of carcinogenicity for most types of CNTs and CNFs at this time, and possible carcinogenicity of one type of CNT (MWCNT-7). The key evidence gaps to be filled by research include: investigation of possible associations between in vitro and early-stage in vivo events that may be predictive of lung cancer or mesothelioma, and systematic analysis of dose-response relationships across materials, including evaluation of the influence of physico-chemical properties and experimental factors on the observation of nonmalignant and malignant endpoints.
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Affiliation(s)
- Eileen D Kuempel
- a National Institute for Occupational Safety and Health , Cincinnati , OH , USA
| | - Marie-Claude Jaurand
- b Institut National de la Santé et de la Recherche Médicale, Unité Mixte de Recherche , UMR 1162 , Paris , France
- c Labex Immuno-Oncology, Sorbonne Paris Cité, University of Paris Descartes , Paris , France
- d University Institute of Hematology, Sorbonne Paris Cité, University of Paris Diderot , Paris , France
- e University of Paris 13, Sorbonne Paris Cité , Saint-Denis , France
| | - Peter Møller
- f Department of Public Health , University of Copenhagen , Copenhagen , Denmark
| | - Yasuo Morimoto
- g Department of Occupational Pneumology , University of Occupational and Environmental Health , Kitakyushu City , Japan
| | | | - Kent E Pinkerton
- i Center for Health and the Environment, University of California , Davis , California , USA
| | - Linda M Sargent
- j National Institute for Occupational Safety and Health , Morgantown , West Virginia , USA
| | - Roel C H Vermeulen
- k Institute for Risk Assessment Sciences, Utrecht University , Utrecht , The Netherlands
| | - Bice Fubini
- l Department of Chemistry and "G.Scansetti" Interdepartmental Center , Università degli Studi di Torino , Torino , Italy
| | - Agnes B Kane
- m Department of Pathology and Laboratory Medicine , Brown University , Providence , RI , USA
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Méndez-Olvera ET, Bustos-Martínez JA, López-Vidal Y, Verdugo-Rodríguez A, Martínez-Gómez D. Cytolethal Distending Toxin From Campylobacter jejuni Requires the Cytoskeleton for Toxic Activity. Jundishapur J Microbiol 2016; 9:e35591. [PMID: 27942359 PMCID: PMC5136451 DOI: 10.5812/jjm.35591] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/23/2015] [Revised: 09/05/2016] [Accepted: 09/05/2016] [Indexed: 02/07/2023] Open
Abstract
Background Campylobacter jejuni is one of the major causes of infectious diarrhea worldwide. The distending cytolethal toxin (CDT) of Campylobacter spp. interferes with normal cell cycle progression. This toxic effect is considered a result of DNase activity that produces chromosomal DNA damage. To perform this event, the toxin must be endocytosed and translocated to the nucleus. Objectives The aim of this study was to evaluate the role of the cytoskeleton in the translocation of CDT to the nucleus. Methods Campylobacter jejuni ATCC 33291 and seven isolates donated from Instituto de Biotecnologia were used in this study. The presence of CDT genes in C. jejuni strains was determined by PCR. To evaluate the effect of CDT, HeLa cells were treated with bacterial lysate, and the damage and morphological changes were analyzed by microscopy, immunofluorescence staining, and flow cytometry. To evaluate the role of the cytoskeleton, HeLa cells were treated with either latrunculin A or by nocodazole and analyzed by microscopy, flow cytometry, and immunoquantification (ELISA). Results The results obtained showed that the eight strains of C. jejuni, including the reference strain, had the ability to produce the toxin. Usage of latrunculin A and nocodazole, two cytoskeletal inhibitors, blocked the toxic effect in cells treated with the toxin. This phenomenon was evident in flow cytometry analysis and immunoquantification of Cdc2-phosphorylated. Conclusions This work showed that the cytotoxic activity of the C. jejuni CDT is dependent on its endocytosis. The alteration in the microtubules and actin filaments caused a blockage transit of the toxin, preventing it from reaching the nucleus of the cell, as well as preventing DNA fragmentation and alteration of the cell cycle. The CDT toxin appears to be an important element for the pathogenesis of campylobacteriosis, since all clinical isolates showed the presence of cdtA, cdtB and cdtC genes.
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Affiliation(s)
- Estela T. Méndez-Olvera
- Departamento de Producción Agrícola y Animal, and Doctorado en Ciencias Biológicas y de la Salud, Universidad Autónoma Metropolitana-Xochimilco, México City, México
- Corresponding author: Estela T. Méndez-Olvera, Departamento de Producción Agrícola y Animal, and Doctorado en Ciencias Biológicas y de la Salud, Universidad Autónoma Metropolitana-Xochimilco, México City, México. E-mail:
| | - Jaime A. Bustos-Martínez
- Departamento de Atención a la Salud, Universidad Autónoma Metropolitana-Xochimilco, México City, México
| | - Yolanda López-Vidal
- Departamento de Microbiología y Parasitología-Facultad de Medicina, Universidad Nacional Autónoma de México, México City, México
| | - Antonio Verdugo-Rodríguez
- Departamento de Microbiología e Inmunología-Facultad de Medicina Veterinaria y Zootecnia, Universidad Nacional Autónoma de México, México City, México
| | - Daniel Martínez-Gómez
- Departamento de Producción Agrícola y Animal, Universidad Autónoma Metropolitana-Xochimilco, México City, México
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Pro-apoptotic effects of rHSG on C6 glioma cells. Int J Mol Med 2016; 38:1190-8. [PMID: 27599901 PMCID: PMC5029950 DOI: 10.3892/ijmm.2016.2725] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/21/2015] [Accepted: 08/17/2016] [Indexed: 12/02/2022] Open
Abstract
Our previous in vitro study demonstrated that the rat hyperplasia suppressor gene (rHSG) inhibited the proliferation of C6 cells. In the present study, we investigated further the effects of rHSG overexpression on the apoptosis of C6 cells and the possible pathways involved. Hoechst 33342/PI double staining and comet assay were used to examine the morphological characteristics of apoptosis and to examine the effects of rHSG on the apoptosis of the C6 cells. Western blot analysis was used to determine the effects of rHSG overexpression on the protein expression levels of poly(ADP-ribose) polymerase (PARP), cleaved caspase-3, phosphorylated extracellular signal-regulated kinase 1/2 (p-Erk1/2), phosphorylated Akt (p-Akt) and phosphoinositide 3-kinase (PI3K)/Akt, as well as on the mitogen-activated protein kinase (MAPK) pathways induced by insulin-like growth factor (IGF)-1. Our results revealed that the C6 cells transfected with the rHSG adenoviral vector (Adv-rHSG-GFP group) efficiently expressed rHSG protein; Hoechst 33342/PI double staining and comet assay revealed that rHSG increased C6 cell apoptosis and induced DNA damage. Western blot analysis indicated that rHSG overexpression significantly increased the level of full-length PARP at 24 and 72 h (P<0.01), but decreased the level at 48 h following transfection (P<0.01), while the proteins levels of cleaved PARP and cleaved caspase-3 increased significantly (P<0.01). The protein expression of p-Erk1/2 and p-Akt began to decrease at 48 h post-transfection (P<0.01). In addition, the protein levels of Akt and Erk1/2 induced by IGF-1 were significantly inhibited. On the whole, the findings of the present study demonstrate that rHSG overexpression induces the apoptosis of rat glioma cells, and that these effects may involve the PI3K/Akt and MAPK pathways.
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Artemenko K, Horáková J, Steinberger B, Besenfelder U, Brem G, Bergquist J, Mayrhofer C. A proteomic approach to monitor the dynamic response of the female oviductal epithelial cell surface to male gametes. J Proteomics 2014; 113:1-14. [PMID: 25281772 DOI: 10.1016/j.jprot.2014.09.016] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/24/2014] [Revised: 09/18/2014] [Accepted: 09/22/2014] [Indexed: 12/11/2022]
Abstract
UNLABELLED Sophisticated strategies to analyze cell surface proteins are indispensable to study fundamental biological processes, such as the response of cells to environmental changes or cell-cell communication. Herein, we describe a refined mass spectrometry-based approach for the specific characterization and quantitation of cell surface proteins expressed in the female reproductive tract. The strategy is based on in situ biotinylation of rabbit oviducts, affinity enrichment of surface exposed biotin tagged proteins and dimethyl labeling of the obtained tryptic peptides followed by LC-MS/MS analysis. This approach proved to be sensitive enough to analyze small sample amounts (<1μg) and allowed further to trace the dynamic composition of the surface proteome of the oviductal epithelium in response to male gametes. The relative protein expression ratios of 175 proteins were quantified. Thirty-one of them were found to be altered over time, namely immediately, 1h and 2h after insemination compared to the time-matched control groups. Functional analysis demonstrated that structural reorganization of the oviductal epithelial cell surface was involved in the early response of the female organ to semen. In summary, this study outlines a workflow that is capable to monitor alterations in the female oviduct that are related to key reproductive processes in vivo. BIOLOGICAL SIGNIFICANCE The proper interaction between the female reproductive tract, in particular, the oviduct and the male gametes, is fundamental to fertilization and embryonic development under physiological conditions. Thereby the oviductal epithelial cell surface proteins play an important role. Besides their direct interaction with male gametes, these molecules participate in signal transduction and, thus, are involved in the mandatory cellular response of the oviductal epithelium. In this study we present a refined LC-MS/MS based workflow that is capable to quantitatively analyze the expression of oviductal epithelial cell surface proteins in response to insemination in vivo. A special focus was on the very early interaction between the female organ and the male gametes. At first, this study clearly revealed an immediate response of the surface proteome to semen, which was modulated over time. The described methodology can be applied for studies of further distinct biological events in the oviduct and therefore contribute to a deeper insight into the formation of new life.
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Affiliation(s)
- Konstantin Artemenko
- Institute of Analytical Chemistry, Department of Chemistry - Biomedical Center and Science for Life Laboratory, Uppsala University, Uppsala, Sweden.
| | - Jana Horáková
- Institute of Analytical Chemistry, Department of Chemistry - Biomedical Center and Science for Life Laboratory, Uppsala University, Uppsala, Sweden
| | - Birgit Steinberger
- Institute of Animal Breeding and Genetics, Department for Biomedical Sciences, University of Veterinary Medicine, Vienna, Austria; Institute of Biotechnology in Animal Production, Department for Agrobiotechnology (IFA Tulln), University of Natural Resources and Applied Life Sciences, Vienna, Tulln, Austria
| | - Urban Besenfelder
- Institute of Biotechnology in Animal Production, Department for Agrobiotechnology (IFA Tulln), University of Natural Resources and Applied Life Sciences, Vienna, Tulln, Austria
| | - Gottfried Brem
- Institute of Animal Breeding and Genetics, Department for Biomedical Sciences, University of Veterinary Medicine, Vienna, Austria
| | - Jonas Bergquist
- Institute of Analytical Chemistry, Department of Chemistry - Biomedical Center and Science for Life Laboratory, Uppsala University, Uppsala, Sweden
| | - Corina Mayrhofer
- Institute of Animal Breeding and Genetics, Department for Biomedical Sciences, University of Veterinary Medicine, Vienna, Austria; Institute of Biotechnology in Animal Production, Department for Agrobiotechnology (IFA Tulln), University of Natural Resources and Applied Life Sciences, Vienna, Tulln, Austria
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Thompson JK, Westbom CM, MacPherson MB, Mossman BT, Heintz NH, Spiess P, Shukla A. Asbestos modulates thioredoxin-thioredoxin interacting protein interaction to regulate inflammasome activation. Part Fibre Toxicol 2014; 11:24. [PMID: 24885895 PMCID: PMC4055279 DOI: 10.1186/1743-8977-11-24] [Citation(s) in RCA: 36] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/16/2014] [Accepted: 05/13/2014] [Indexed: 01/26/2023] Open
Abstract
BACKGROUND Asbestos exposure is related to various diseases including asbestosis and malignant mesothelioma (MM). Among the pathogenic mechanisms proposed by which asbestos can cause diseases involving epithelial and mesothelial cells, the most widely accepted one is the generation of reactive oxygen species and/or depletion of antioxidants like glutathione. It has also been demonstrated that asbestos can induce inflammation, perhaps due to activation of inflammasomes. METHODS The oxidation state of thioredoxin was analyzed by redox Western blot analysis and ROS generation was assessed spectrophotometrically as a read-out of solubilized formazan produced by the reduction of nitrotetrazolium blue (NTB) by superoxide. Quantitative real time PCR was used to assess changes in gene transcription. RESULTS Here we demonstrate that crocidolite asbestos fibers oxidize the pool of the antioxidant, Thioredoxin-1 (Trx1), which results in release of Thioredoxin Interacting Protein (TXNIP) and subsequent activation of inflammasomes in human mesothelial cells. Exposure to crocidolite asbestos resulted in the depletion of reduced Trx1 in human peritoneal mesothelial (LP9/hTERT) cells. Pretreatment with the antioxidant dehydroascorbic acid (a reactive oxygen species (ROS) scavenger) reduced the level of crocidolite asbestos-induced Trx1 oxidation as well as the depletion of reduced Trx1. Increasing Trx1 expression levels using a Trx1 over-expression vector, reduced the extent of Trx1 oxidation and generation of ROS by crocidolite asbestos, and increased cell survival. In addition, knockdown of TXNIP expression by siRNA attenuated crocidolite asbestos-induced activation of the inflammasome. CONCLUSION Our novel findings suggest that extensive Trx1 oxidation and TXNIP dissociation may be one of the mechanisms by which crocidolite asbestos activates the inflammasome and helps in development of MM.
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Affiliation(s)
| | | | | | | | | | | | - Arti Shukla
- Department of Pathology, University of Vermont, College of Medicine, Burlington, VT 05405, USA.
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12
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Chen TI, Chiu HW, Pan YC, Hsu ST, Lin JH, Yang KT. Intermittent hypoxia-induced protein phosphatase 2A activation reduces PC12 cell proliferation and differentiation. J Biomed Sci 2014; 21:46. [PMID: 24885237 PMCID: PMC4058715 DOI: 10.1186/1423-0127-21-46] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/06/2013] [Accepted: 11/26/2013] [Indexed: 02/04/2023] Open
Abstract
BACKGROUND Intermittent hypoxia (IH) plays a critical role in sleep breathing disorder-associated hippocampus impairments, including neurocognitive deficits, irreversible memory and learning impairments. IH-induced neuronal injury in the hippocampus may result from reduced precursor cell proliferation and the relative numbers of postmitotic differentiated neurons. However, the mechanisms underlying IH-induced reactive oxygen species (ROS) generation effects on cell proliferation and neuronal differentiation remain largely unknown. RESULTS ROS generation significantly increased after 1-4 days of IH without increased pheochromocytoma-12 (PC12) cell death, which resulted in increased protein phosphatase 2A (PP2A) mRNA and protein levels. After 3-4 days of IH, extracellular signal-regulated kinases 1/2 (ERK1/2) protein phosphorylation decreased, which could be reversed by superoxide dismutase (SOD), 1,10-phenanthroline (Phe), the PP2A phosphorylation inhibitors, okadaic acid (OKA) and cantharidin, and the ERK phosphorylation activator nicotine (p < 0.05). In particular, the significantly reduced cell proliferation and increased proportions of cells in the G0/G1 phase after 1-4 days of IH (p < 0.05), which resulted in decreased numbers of PC12 cells, could be reversed by treatment with SOD, Phe, PP2A inhibitors and an ERK activator. In addition, the numbers of nerve growth factor (NGF)-induced PC12 cells with neurite outgrowths after 3-4 days of IH were less than those after 4 days of RA, which was also reversed by SOD, Phe, PP2A inhibitors and an ERK activator. CONCLUSIONS Our results suggest that IH-induced ROS generation increases PP2A activation and subsequently downregulates ERK1/2 activation, which results in inhibition of PC12 cell proliferation through G0/G1 phase arrest and NGF-induced neuronal differentiation.
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Affiliation(s)
| | | | | | | | | | - Kun-Ta Yang
- Master program, Physiology and Anatomical Medicine, School of Medicine, Tzu Chi University, Hualien, Taiwan.
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13
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Barlow CA, Lievense L, Gross S, Ronk CJ, Paustenbach DJ. The role of genotoxicity in asbestos-induced mesothelioma: an explanation for the differences in carcinogenic potential among fiber types. Inhal Toxicol 2014; 25:553-67. [PMID: 23905972 DOI: 10.3109/08958378.2013.807321] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
Abstract
The mechanism(s) underlying asbestos toxicity associated with the pathogenesis of mesothelioma has been a challenge to unravel for more than 60 years. A significant amount of research has focused on the characteristics of different fiber types and their potential to induce mesothelioma. These mechanistic studies of fiber toxicity have proceeded along two lines: those demonstrating biochemical mechanisms by which fibers induce disease and those investigating human susceptibility. Most recent studies focused on in vitro genotoxic effects induced by asbestos as the mechanism responsible for asbestos-induced disease. Although asbestos exerts a genotoxic effect at certain concentrations in vitro, a positive response in these tests does not indicate that the chemical is likely to produce an increased risk of carcinogenesis in exposed human populations. Thus far, findings from studies on the effects of fiber type in mesothelial cells are seriously flawed by a lack of a dose response relationship. The common limitation of these in vitro experiments is the lack of attention paid to the complexities of the human anatomy, biochemistry and physiology, which make the observed effects in these experimental systems difficult to extrapolate to persons in the workplace. Mechanistic differences between carcinogenic and genotoxic processes indicate why tests for genotoxicity do not provide much insight regarding the ability to predict carcinogenic potential in workers exposed to asbestos doses in the post-Occupational Safety and Health Administration era. This review discusses the existing literature on asbestos-induced genotoxicity and explains why these studies may or may not likely help characterize the dose-response curve at low dose.
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Impact of glutathione peroxidase-1 deficiency on macrophage foam cell formation and proliferation: implications for atherogenesis. PLoS One 2013; 8:e72063. [PMID: 23991041 PMCID: PMC3750037 DOI: 10.1371/journal.pone.0072063] [Citation(s) in RCA: 31] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/26/2012] [Accepted: 07/10/2013] [Indexed: 11/19/2022] Open
Abstract
Clinical and experimental evidence suggests a protective role for the antioxidant enzyme glutathione peroxidase-1 (GPx-1) in the atherogenic process. GPx-1 deficiency accelerates atherosclerosis and increases lesion cellularity in ApoE−/− mice. However, the distribution of GPx-1 within the atherosclerotic lesion as well as the mechanisms leading to increased macrophage numbers in lesions is still unknown. Accordingly, the aims of the present study were (1) to analyze which cells express GPx-1 within atherosclerotic lesions and (2) to determine whether a lack of GPx-1 affects macrophage foam cell formation and cellular proliferation. Both in situ-hybridization and immunohistochemistry of lesions of the aortic sinus of ApoE−/− mice after 12 weeks on a Western type diet revealed that both macrophages and – even though to a less extent – smooth muscle cells contribute to GPx-1 expression within atherosclerotic lesions. In isolated mouse peritoneal macrophages differentiated for 3 days with macrophage-colony-stimulating factor (MCSF), GPx-1 deficiency increased oxidized low density-lipoprotein (oxLDL) induced foam cell formation and led to increased proliferative activity of peritoneal macrophages. The MCSF- and oxLDL-induced proliferation of peritoneal macrophages from GPx-1−/−ApoE−/− mice was mediated by the p44/42 MAPK (p44/42 mitogen-activated protein kinase), namely ERK1/2 (extracellular-signal regulated kinase 1/2), signaling pathway as demonstrated by ERK1/2 signaling pathways inhibitors, Western blots on cell lysates with primary antibodies against total and phosphorylated ERK1/2, MEK1/2 (mitogen-activated protein kinase kinase 1/2), p90RSK (p90 ribosomal s6 kinase), p38 MAPK and SAPK/JNK (stress-activated protein kinase/c-Jun N-terminal kinase), and immunohistochemistry of mice atherosclerotic lesions with antibodies against phosphorylated ERK1/2, MEK1/2 and p90RSK. Representative effects of GPx-1 deficiency on both macrophage proliferation and MAPK phosphorylation could be abolished by the GPx mimic ebselen. The present study demonstrates that GPx-1 deficiency has a significant impact on macrophage foam cell formation and proliferation via the p44/42 MAPK (ERK1/2) pathway encouraging further studies on new therapeutic strategies against atherosclerosis.
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15
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Antioxidant treatment regulates the humoral immune response during acute viral infection. J Virol 2012; 87:2577-86. [PMID: 23255789 DOI: 10.1128/jvi.02714-12] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
Generation of reactive oxygen intermediates (ROI) following antigen receptor ligation is critical to promote cellular responses. However, the effect of antioxidant treatment on humoral immunity during a viral infection was unknown. Mice were infected with lymphocytic choriomeningitis virus (LCMV) and treated with Mn(III)tetrakis(4-benzoic acid)porphyrin chloride (MnTBAP), a superoxide dismutase mimetic, from days 0 to 8 postinfection. On day 8, at the peak of the splenic response in vehicle-treated mice, virus-specific IgM and IgG antibody-secreting cells (ASC) were decreased 22- and 457-fold in MnTBAP-treated animals. By day 38, LCMV-specific IgG ASC were decreased 5-fold in the bone marrow of drug-treated mice, and virus-specific antibodies were of lower affinity. Interestingly, antioxidant treatment had no effect on the number of LCMV-specific IgG memory B cells. In addition to decreases in ASC, MnTBAP treatment decreased the number of functional virus-specific CD4(+) T cells. The decreased numbers of ASC observed on day 8 in drug-treated mice were due to a combination of Bim-mediated cell death and decreased proliferation. Together, these data demonstrate that ROI regulate antiviral ASC expansion and have important implications for understanding the effects of antioxidants on humoral immunity during infection and immunization.
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Ambrogi V, Mineo TC. Clinical and biologic prognostic factors in malignant pleural mesothelioma. Thorac Cancer 2012; 3:289-302. [PMID: 28920270 DOI: 10.1111/j.1759-7714.2012.00127.x] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/15/2023] Open
Abstract
Malignant pleural mesothelioma is an extremely aggressive neoplasm of the pleura mainly attributable to asbestos exposure. Conventional medical, physical, and surgical treatments and their combinations are basically ineffective and just a few subjects experience some benefit. No definite guidelines can be provided in patient selection and therapeutic strategies. Currently, malignant pleural mesothelioma therapy is guided by clinical stage and patient characteristics, which are quite unreliable, rather than by the histological or molecular features of the tumor. In the present review the impact on prognosis of classic (i.e. etiology, age, gender, histology, staging), as well as relatively new clinical factors such as quality of life, positron emission tomography assessment, and occult residual disease, are firstly evaluated. In the second section of the review several biological variables and genetic markers, which have been recently recognized as the bases of the disease onset and development, are listed and discussed. There are serum and tissue markers. The latter are mainly related to cell cycle regulation, apoptosis, and growth factor pathways. These novel factors may play an important role in defining the prognosis of the disease and, subsequently, may have a place in addressing therapy.
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Affiliation(s)
- Vincenzo Ambrogi
- Department of Thoracic Surgery, Tor Vergata University, Rome, Italy
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- Department of Thoracic Surgery, Tor Vergata University, Rome, Italy
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Sontag RL, Weber TJ. Ectopic ERK expression induces phenotypic conversion of C10 cells and alters DNA methyltransferase expression. BMC Res Notes 2012; 5:217. [PMID: 22559742 PMCID: PMC3416577 DOI: 10.1186/1756-0500-5-217] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/02/2012] [Accepted: 04/19/2012] [Indexed: 01/07/2023] Open
Abstract
BACKGROUND Many lung carcinogens activate mitogen activated protein kinase (MAPK) pathways and DNA methyltransferases (DNMTs) are under investigation as therapeutic targets for lung cancer. Our goal is to determine whether C10 type II alveolar epithelial cells are a sensitive model to investigate ERK-dependent transformation and DNMT expression patterns in experimental lung cancer. FINDINGS Ectopic expression of an extracellular signal regulated kinase (ERK)-green fluorescent protein (ERK1-GFP) induces acquisition of growth in soft agar that is selectively associated with latent effects on the expression of DNA methyl transferases (DNMT1 and 3b), xeroderma pigmentosum complementation group A (XPA), DNA-dependent protein kinase catalytic subunit (DNA-PKcs), increased phosphatase activity and enhanced sensitivity to 5-azacytidine (5-azaC)-mediated toxicity, relative to controls. CONCLUSIONS Ectopic expression of ERK alone is sufficient to promote phenotypic conversion of C10 cells associated with altered DNMT expression patterns and sensitivity to DNMT inhibitor. This model may have applications for predicting sensitivity to DNMT inhibitors.
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Affiliation(s)
- Ryan L Sontag
- Systems Toxicology, Pacific Northwest National Laboratory, 790 6th Street, J4-02, Richland, WA, 99354, USA
| | - Thomas J Weber
- Systems Toxicology, Pacific Northwest National Laboratory, 790 6th Street, J4-02, Richland, WA, 99354, USA
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18
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Angiogenesis and oxidative stress: Common mechanisms linking psoriasis with atherosclerosis. J Dermatol Sci 2011; 63:1-9. [DOI: 10.1016/j.jdermsci.2011.04.007] [Citation(s) in RCA: 115] [Impact Index Per Article: 8.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/07/2010] [Revised: 03/30/2011] [Accepted: 04/11/2011] [Indexed: 11/22/2022]
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Roles of the ERK, JNK/AP-1/cyclin D1–CDK4 pathway in silica-induced cell cycle changes in human embryo lung fibroblast cells. Cell Biol Int 2011; 35:697-704. [DOI: 10.1042/cbi20100298] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/20/2023]
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20
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Heo J. Redox control of GTPases: from molecular mechanisms to functional significance in health and disease. Antioxid Redox Signal 2011; 14:689-724. [PMID: 20649471 DOI: 10.1089/ars.2009.2984] [Citation(s) in RCA: 51] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/11/2023]
Abstract
Small GTPases, including the proto-oncoprotein Ras and Rho GTPases, are involved in various cellular signaling events. Some of these small GTPases are redox sensitive, including Ras, Rho, Ran, Dexras1, and Rhes GTPases. Thus, the redox-mediated regulation of these GTPases often determines the course of their cellular signaling cascades. This article takes into consideration the application of Marcus theory to potential redox-based molecular mechanisms in the regulation of these redox-sensitive GTPases and the relevance of such mechanisms to a specific redox-sensitive motif. The discussion also takes into account various diseases, including cancers, heart, and neuronal disorders, that are often linked with the dysregulation of the redox signaling cascades associated with these redox-sensitive GTPases.
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Affiliation(s)
- Jongyun Heo
- Department of Chemistry and Biochemistry, The University of Texas at Arlington, Arlington, Texas 76019, USA.
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21
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Maeda M, Nishimura Y, Kumagai N, Hayashi H, Hatayama T, Katoh M, Miyahara N, Yamamoto S, Hirastuka J, Otsuki T. Dysregulation of the immune system caused by silica and asbestos. J Immunotoxicol 2010; 7:268-78. [PMID: 20849352 DOI: 10.3109/1547691x.2010.512579] [Citation(s) in RCA: 68] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022] Open
Abstract
Silica and asbestos cause pneumoconioses known as silicosis and asbestosis, respectively, that are each characterized by progressive pulmonary fibrosis. While local effects of inhaled silica particles alter the function of alveolar macrophages and sequential cellular and molecular biological events, general systemic immunological effects may also evolve. One well-known health outcome associated with silica exposure/silicosis is an increase in the incidence of autoimmune disorders. In addition, while exposure to silica--in the crystalline form--has also been seen to be associated with the development of lung cancers, it remains unclear as to whether or not silicosis is a necessary condition for the elevation of silica-associated lung cancer risks. Since asbestos is a mineral silicate, it would be expected to also possess generalized immunotoxicological effects similar to those associated with silica particles. However, asbestos-exposed patients are far better known than silicotic patients for development of malignant diseases such as lung cancer and mesothelioma, and less so for the development of autoimmune disorders. With both asbestos and crystalline silica, one important dysregulatory outcome that needs to be considered is an alteration in tumor immunity that allows for silica- or asbestos- (or asbestos-associated agent)-induced tumors to survive and thrive in situ. In this review, the immunotoxicological effects of both silica and asbestos are presented and contrasted in terms of their abilities to induce immune system dysregulation that then are manifest by the onset of autoimmunity or by alterations in host-tumor immunity.
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Affiliation(s)
- Megumi Maeda
- Department of Hygiene, Kawasaki Medical School, Kurashiki, Japan
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22
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Organogenic nodule formation in hop: a tool to study morphogenesis in plants with biotechnological and medicinal applications. J Biomed Biotechnol 2010; 2010. [PMID: 20811599 PMCID: PMC2929504 DOI: 10.1155/2010/583691] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/29/2009] [Revised: 06/14/2010] [Accepted: 06/28/2010] [Indexed: 11/18/2022] Open
Abstract
The usage of Humulus lupulus for brewing increased the demand for high-quality plant material. Simultaneously, hop has been used in traditional medicine and recently recognized with anticancer and anti-infective properties. Tissue culture techniques have been reported for a wide range of species, and open the prospect for propagation of disease-free, genetically uniform and massive amounts of plants in vitro. Moreover, the development of large-scale culture methods using bioreactors enables the industrial production of secondary metabolites.
Reliable and efficient tissue culture protocol for shoot regeneration through organogenic nodule formation was established for hop. The present review describes the histological, and biochemical changes occurring during this morphogenic process, together with an analysis of transcriptional and metabolic profiles. We also discuss the existence of common molecular factors among three different morphogenic processes: organogenic nodules and somatic embryogenesis, which strictly speaking depend exclusively on intrinsic developmental reprogramming, and legume nitrogen-fixing root nodules, which arises in response to symbiosis. The review of the key factors that participate in hop nodule organogenesis and the comparison with other morphogenic processes may have merit as a study presenting recent advances in complex molecular networks occurring during morphogenesis and together, these provide a rich framework for biotechnology applications.
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Mach WJ, Thimmesch AR, Orr JA, Slusser JG, Pierce JD. Flow cytometry and laser scanning cytometry, a comparison of techniques. J Clin Monit Comput 2010; 24:251-9. [DOI: 10.1007/s10877-010-9242-4] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/28/2009] [Accepted: 06/13/2010] [Indexed: 03/16/2023]
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24
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Hillegass JM, Shukla A, Lathrop SA, MacPherson MB, Fukagawa NK, Mossman BT. Assessing nanotoxicity in cells in vitro. WILEY INTERDISCIPLINARY REVIEWS. NANOMEDICINE AND NANOBIOTECHNOLOGY 2010; 2:219-31. [PMID: 20063369 PMCID: PMC2854858 DOI: 10.1002/wnan.54] [Citation(s) in RCA: 112] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/25/2023]
Abstract
Nanomaterials are commonly defined as particles or fibers of less than 1 microm in diameter. For these reasons, they may be respirable in humans and have the potential, based upon their geometry, composition, size, and transport or durability in the body, to cause adverse effects on human health, especially if they are inhaled at high concentrations. Rodent inhalation models to predict the toxicity and pathogenicity of nanomaterials are prohibitive in terms of time and expense. For these reasons, a panel of in vitro assays is described below. These include cell culture assays for cytotoxicity (altered metabolism, decreased growth, lytic or apoptotic cell death), proliferation, genotoxicity, and altered gene expression. The choice of cell type for these assays may be dictated by the procedure or endpoint selected. Most of these assays have been standardized in our laboratory using pathogenic minerals (asbestos and silica) and non-pathogenic particles (fine titanium dioxide or glass beads) as negative controls. The results of these in vitro assays should predict whether testing of selected nanomaterials should be pursued in animal inhalation models that simulate physiologic exposure to inhaled nanomaterials. Conversely, intrathoracic or intrapleural injection of nanomaterials into rodents can be misleading because they bypass normal clearance mechanisms, and non-pathogenic fibers and particles can test positively in these assays.
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Heintz NH, Janssen-Heininger YMW, Mossman BT. Asbestos, lung cancers, and mesotheliomas: from molecular approaches to targeting tumor survival pathways. Am J Respir Cell Mol Biol 2010; 42:133-9. [PMID: 20068227 DOI: 10.1165/rcmb.2009-0206tr] [Citation(s) in RCA: 116] [Impact Index Per Article: 8.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/12/2023] Open
Abstract
Fifteen years have passed since we published findings in the AJRCMB demonstrating that induction of early response fos/jun proto-oncogenes in rodent tracheal and mesothelial cells correlates with fibrous geometry and pathogenicity of asbestos. Our study was the first to suggest that the aberrant induction of signaling responses by crocidolite asbestos and erionite, a fibrous zeolite mineral associated with the development of malignant mesotheliomas (MMs) in areas of Turkey, led to altered gene expression. New data questioned the widely held belief at that time that the carcinogenic effects of asbestos in the development of lung cancer and MM were due to genotoxic or mutagenic effects. Later studies by our group revealed that proto-oncogene expression and several of the signaling pathways activated by asbestos were redox dependent, explaining why antioxidants and antioxidant enzymes were elevated in lung and pleura after exposure to asbestos and how they alleviated many of the phenotypic and functional effects of asbestos in vitro or after inhalation. Since these original studies, our efforts have expanded to understand the interface between asbestos-induced redox-dependent signal transduction cascades, the relationship between these pathways and cell fate, and the role of asbestos and cell interactions in development of asbestos-associated diseases. Of considerable significance is the fact that the signal transduction pathways activated by asbestos are also important in survival and chemoresistance of MMs and lung cancers. An understanding of the pathogenic features of asbestos fibers and dysregulation of signaling pathways allows strategies for the prevention and therapy of asbestos-related diseases.
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Affiliation(s)
- Nicholas H Heintz
- Department of Pathology, University of Vermont College of Medicine, 89 Beaumont Avenue, Burlington, VT 05405-0068, USA
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Lai TC, Pociask DA, Ferris M, Nguyen HT, Miller CA, Brody A, Sullivan D. Small interfering RNAs (siRNAs) targeting TGF-beta1 mRNA suppress asbestos-induced expression of TGF-beta1 and CTGF in fibroblasts. J Environ Pathol Toxicol Oncol 2009; 28:109-19. [PMID: 19817698 DOI: 10.1615/jenvironpatholtoxicoloncol.v28.i2.30] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022] Open
Abstract
Interstitial lung disease (ILD) afflicts millions of people worldwide. ILD can be caused by a number of agents, including inhaled asbestos, and may ultimately result in respiratory failure and death. Currently, there are no effective treatments for ILD. Transforming growth factor-beta1 (TGF-beta1) is thought to play an important role in the development of pulmonary fibrosis, and asbestos has been shown to induce TGF-beta1 expression in a murine model of ILD. To better define the role of TGF-beta1 in ILD, we developed several small interfering RNAs (siRNAs) that target TGF-beta1 mRNA for degradation. To assess the efficacy of each siRNA in reducing asbestos-induced TGF-beta1 expression, Swiss 3T3 fibroblasts were transfected with TGF-beta1 siRNAs and then treated with chrysotile asbestos for 48 h. Two independent siRNAs targeting TGF-beta1 mRNA knocked-down asbestos-induced expression of TGF-beta1 mRNA by 72-89% and protein by 70-84%. Interestingly, siRNA knockdown of TGF-beta1 also reduced asbestos-induced expression of connective tissue growth factor (CTGF). CTGF can be upregulated by TGF-beta1 and appears to play an important role in the development of pulmonary fibrosis. These results suggest that siRNAs could be effective in preventing or possibly arresting the progression of pulmonary fibrosis. Studies are underway in vivo to test this postulate.
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Affiliation(s)
- Tai-Cheng Lai
- Department of Environmental Health Sciences, Tulane University School of Public Health and Tropical Medicine, New Orleans, LA, USA
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Wang X, Samet JM, Ghio AJ. ASBESTOS-INDUCED ACTIVATION OF CELL SIGNALING PATHWAYS IN HUMAN BRONCHIAL EPITHELIAL CELLS. Exp Lung Res 2009; 32:229-43. [PMID: 16908449 DOI: 10.1080/01902140600817507] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
Abstract
Using respiratory epithelial cells transfected with either superoxide dismutase (SOD) or catalase, the authors tested the hypothesis that the activation of the epidermal growth factor (EGF) receptor signal pathway after asbestos exposure involves an oxidative stress. Western blotting using phospho-specific antibodies demonstrated that the EGF receptor kinase inhibitor PD153035 decreased both the phosphorylation of extracellular signal-regulated kinase (ERK)1/2 and its upstream signal pathway, including mitogen-activate protein kinase/ERK kinase (MEK)1/2. Similarly, the MEK1/2 kinase inhibitor PD98059 also demonstrated the ability to decrease phosphorylation of ERK1/2. Crocidolite-induced phosphorylation of EGF receptor, ERK1/2, and MEK1/2 was reduced by transfection of BEAS-2B cells with a catalase vector, supporting a participation of oxidative stress in this pathway. These results show that crocidolite can activate the phosphorylation of EGF receptor and its downstream cell signal pathway in BEAS-2B cells and this is associated with the oxidative stress presented by the fibers.
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Affiliation(s)
- Xinchao Wang
- National Health Effects and Environmental Research Laboratory, Office of Research and Development, United States Environmental Protection Agency, Research Triangle Park, North Carolina 27711, USA
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Henzi T, Blum WV, Pfefferli M, Kawecki TJ, Salicio V, Schwaller B. SV40-induced expression of calretinin protects mesothelial cells from asbestos cytotoxicity and may be a key factor contributing to mesothelioma pathogenesis. THE AMERICAN JOURNAL OF PATHOLOGY 2009; 174:2324-36. [PMID: 19435792 DOI: 10.2353/ajpath.2009.080352] [Citation(s) in RCA: 26] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/31/2023]
Abstract
The calcium-binding protein calretinin has emerged as a useful marker for the identification of mesotheliomas of the epithelioid and mixed types, but its putative role in tumor development has not been addressed previously. Although exposure to asbestos fibers is considered the main cause of mesothelioma, undoubtedly, not all mesothelioma patients have a history of asbestos exposure. The question as to whether the SV40 virus is involved as a possible co-factor is still highly debated. Here we show that increased expression of SV40 early gene products in the mesothelial cell line MeT-5A induces the expression of calretinin and that elevated calretinin levels strongly correlate with increased resistance to asbestos cytotoxicity. Calretinin alone mediates a significant part of this protective effect because cells stably transfected with calretinin cDNA were clearly more resistant to the toxic effects of crocidolite than mock-transfected control cells. Down-regulation of calretinin by antisense methods restored the sensitivity to asbestos toxicity to a large degree. The protective effect observed in clones with higher calretinin expression levels could be eliminated by phosphatidylinositol 3-kinase (PI3K) inhibitors, implying an important role for the PI3K/AKT signaling (survival) pathway in mediating the protective effect. Up-regulation of calretinin, resulting from either asbestos exposure or SV40 oncoproteins, may be a common denominator that leads to increased resistance to asbestos cytotoxicity and thereby contributes to mesothelioma carcinogenesis.
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Affiliation(s)
- Thomas Henzi
- Unit of Anatomy, Department of Medicine, University of Fribourg, Route Albert-Gockel 1, CH-1700 Fribourg, Switzerland
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Buder-Hoffmann SA, Shukla A, Barrett TF, MacPherson MB, Lounsbury KM, Mossman BT. A protein kinase Cdelta-dependent protein kinase D pathway modulates ERK1/2 and JNK1/2 phosphorylation and Bim-associated apoptosis by asbestos. THE AMERICAN JOURNAL OF PATHOLOGY 2008; 174:449-59. [PMID: 19116364 DOI: 10.2353/ajpath.2009.080180] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
Abstract
Inhalation of asbestos and oxidant-generating pollutants causes injury and compensatory proliferation of lung epithelium, but the signaling mechanisms that lead to these responses are unclear. We hypothesized that a protein kinase (PK)Cdelta-dependent PKD pathway was able to regulate downstream mitogen-activated protein kinases, affecting pro- and anti-apoptotic responses to asbestos. Elevated levels of phosphorylated PKD (p-PKD) were observed in distal bronchiolar epithelial cells of mice inhaling asbestos. In contrast, PKCdelta-/- mice showed significantly lower levels of p-PKD in lung homogenates and in situ after asbestos inhalation. In a murine lung epithelial cell line, asbestos caused significant increases in the phosphorylation of PKCdelta-dependent PKD, ERK1/2, and JNK1/2/c-Jun that occurred with decreases in the BH3-only pro-apoptotic protein, Bim. Silencing of PKCdelta, PKD, and use of small molecule inhibitors linked the ERK1/2 pathway to the prevention of Bim-associated apoptosis as well as the JNK1/2/c-Jun pathway to the induction of apoptosis. Our studies are the first to show that asbestos induces PKD phosphorylation in lung epithelial cells both in vivo and in vitro. PKCdelta-dependent PKD phosphorylation by asbestos is causally linked to a cellular pathway that involves the phosphorylation of both ERK1/2 and JNK1/2, which play opposing roles in the apoptotic response induced by asbestos.
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Affiliation(s)
- Sylke A Buder-Hoffmann
- Department of Pathology, University of Vermont College of Medicine, Burlington, VT 05405, USA
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Kido T, Morimoto Y, Asonuma E, Yatera K, Ogami A, Oyabu T, Tanaka I, Kido M. Chrysotile Asbestos Causes AEC Apoptosis via the Caspase ActivationIn VitroandIn Vivo. Inhal Toxicol 2008; 20:339-47. [DOI: 10.1080/08958370701866362] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
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31
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Barlow CA, Kitiphongspattana K, Siddiqui N, Roe MW, Mossman BT, Lounsbury KM. Protein kinase A-mediated CREB phosphorylation is an oxidant-induced survival pathway in alveolar type II cells. Apoptosis 2008; 13:681-92. [PMID: 18392938 PMCID: PMC2311383 DOI: 10.1007/s10495-008-0203-z] [Citation(s) in RCA: 37] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
Abstract
Oxidant stress plays a role in the pathogenesis of pulmonary diseases, including fibrotic lung disease and cancer. We previously found that hydrogen peroxide (H2O2) initiates an increase in Ca2+/cAMP-response element binding protein (CREB) phosphorylation in C10 alveolar type II cells that requires activation of extracellular regulated kinases 1/2 (ERK1/2). Here, we investigated the role of crosstalk between protein kinase A (PKA) and epidermal growth factor receptor (EGFR) in oxidant-induced signaling to ERK1/2 and CREB in C10 cells. Application of H2O2 increased nuclear accumulation of PKA, and inhibition of PKA with H89 reduced oxidant-mediated phosphorylation of both CREB and ERK1/2. Single cell measurements of cAMP and redox status, using a FRET-based biosensor and a redox-sensitive GFP, respectively, indicated that H2O2 increases production of cAMP that correlates with redox state. Inhibition of EGFR activity decreased both H2O2-induced CREB phosphorylation and translocation of PKA to the nucleus, suggesting that crosstalk between PKA and EGFR underlies the oxidant-induced CREB response. Furthermore, knockdown of CREB expression using siRNA led to a decrease in bcl-2 and an increase in oxidant-induced apoptosis. Together these data reveal a novel role for crosstalk between PKA, ERK1/2 and CREB that mediates cell survival during oxidant stress.
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Affiliation(s)
- Christy A. Barlow
- Department of Pharmacology, University of Vermont, 89 Beaumont Avenue, Burlington, VT 05405 USA
- Department of Pharmacology, University of Wisconsin, Madison, WI 53713 USA
| | | | - Nazli Siddiqui
- Department of Medicine, University of Chicago, Chicago, IL 60637 USA
| | - Michael W. Roe
- Department of Medicine, University of Chicago, Chicago, IL 60637 USA
| | - Brooke T. Mossman
- Department of Pathology, University of Vermont, Burlington, VT 05405 USA
| | - Karen M. Lounsbury
- Department of Pharmacology, University of Vermont, 89 Beaumont Avenue, Burlington, VT 05405 USA
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32
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Tephly LA, Carter AB. Asbestos-induced MKP-3 expression augments TNF-alpha gene expression in human monocytes. Am J Respir Cell Mol Biol 2008; 39:113-23. [PMID: 18314537 DOI: 10.1165/rcmb.2007-0356oc] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022] Open
Abstract
TNF-alpha is associated with the development of interstitial fibrosis. We have demonstrated that the p38 mitogen-activated protein (MAP) kinase regulates TNF-alpha expression in monocytes exposed to asbestos. In this report, we asked if extracellular signal-regulated kinase (ERK) was also involved in TNF-alpha expression in monocytes exposed to asbestos. We found that p38 and ERK were differentially activated in alveolar macrophages obtained from patients with asbestosis compared with normal subjects. More specifically, p38 was constitutively active and ERK activation was suppressed. Since the upstream pathway leading to ERK was intact, we hypothesized that an ERK-specific phosphatase was, in part, responsible for the decreased ERK activity. We evaluated whether the dual specificity phosphatase MAP kinase phosphatase (MKP)-3, which is highly expressed in the lung and specifically dephosphorylates ERK, was increased after exposure to asbestos. We found that MKP-3 increased after exposure to asbestos, and its expression was regulated by p38. We found that p38 and ERK negatively regulated one another, and MKP-3 had a role in this differential activation. We also found that p38 was a positive regulator and ERK was a negative regulator of TNF-alpha gene expression. Cells overexpressing MKP-3 had a significant increase in TNF-alpha gene expression, suggesting than an environment favoring p38 MAP kinase activation is necessary for TNF-alpha production in monocytes exposed to asbestos. Taken together, these data demonstrate that the p38 MAP kinase down-regulates ERK via activation of MKP-3 in human monocytes exposed to asbestos to enhance TNF-alpha gene expression.
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Affiliation(s)
- Linda A Tephly
- Division of Pulmonary and Critical Care Medicine, C33 GH, University of Iowa Hospital and Clinics, 200 Hawkins Drive, Iowa City, IA 52242, USA
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33
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Manning CB, Sabo-Attwood T, Robledo RF, Macpherson MB, Rincón M, Vacek P, Hemenway D, Taatjes DJ, Lee PJ, Mossman BT. Targeting the MEK1 cascade in lung epithelium inhibits proliferation and fibrogenesis by asbestos. Am J Respir Cell Mol Biol 2008; 38:618-26. [PMID: 18192500 DOI: 10.1165/rcmb.2007-0382oc] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/22/2023] Open
Abstract
The extracellular signal-regulated kinases 1 and 2 (ERK1/2) are phosphorylated after inhalation of asbestos. The effect of blocking this signaling pathway in lung epithelium is unclear. Asbestos-exposed transgenic mice expressing a dominant-negative mitogen-activated protein kinase kinase-1 (dnMEK1) (i.e., the upstream kinase necessary for phosphorylation of ERK1/2) targeted to lung epithelium exhibited morphologic and molecular changes in lung. Transgene-positive (Tg+) (i.e., dnMEK1) and transgene-negative (Tg-) littermates were exposed to crocidolite asbestos for 2, 4, 9, and 32 days or maintained in clean air (sham controls). Distal bronchiolar epithelium was isolated using laser capture microdissection and mRNA analyzed for molecular markers of proliferation and Clara cell secretory protein (CCSP). Lungs and bronchoalveolar lavage fluids were analyzed for inflammatory and proliferative changes and molecular markers of fibrogenesis. Distal bronchiolar epithelium of asbestos-exposed wild-type mice showed increased expression of c-fos at 2 days. Elevated mRNA levels of histone H3 and numbers of Ki-67-labeled proliferating bronchiolar epithelial cells were decreased at 4 days in asbestos-exposed Tg+ mice. At 32 days, distal bronchioles normally composed of Clara cells in asbestos-exposed Tg+ mouse lungs exhibited nonreplicating ciliated and mucin-secreting cells as well as decreased mRNA levels of CCSP. Gene expression (procollagen 3-a-1, procollagen 1-a-1, and IL-6) linked to fibrogenesis was also increased in lung homogenates of asbestos-exposed Tg- mice, but reduced in asbestos-exposed Tg+ mice. These results suggest a critical role of MEK1 signaling in epithelial cell proliferation and lung remodeling after toxic injury.
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Affiliation(s)
- Christopher B Manning
- Environmental Pathology Program, University of Vermont College of Medicine, Department of Pathology, 89 Beaumont Avenue, Burlington, VT 05405, USA
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Chapter 9 Cell Signaling by Oxidants: Pathways Leading to Activation of Mitogen-activated Protein Kinases (MAPK) and Activator Protein-1 (AP-1). CURRENT TOPICS IN MEMBRANES 2008. [DOI: 10.1016/s1063-5823(08)00209-3] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
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35
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Kang JL, Moon C, Lee HS, Lee HW, Park EM, Kim HS, Castranova V. Comparison of the biological activity between ultrafine and fine titanium dioxide particles in RAW 264.7 cells associated with oxidative stress. JOURNAL OF TOXICOLOGY AND ENVIRONMENTAL HEALTH. PART A 2008; 71:478-485. [PMID: 18338282 DOI: 10.1080/15287390801906675] [Citation(s) in RCA: 41] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/26/2023]
Abstract
Ultrafine or fine titanium dioxide (TiO(2)) particles are widely used in the production of white pigments, for sunscreens, and in cleanup techniques. However, currently knowledge is deficient concerning cellular responses to these particles. The study evaluated and compared the biological activity of ultrafine and fine TiO(2) particles in RAW 264.7 macrophages according to an oxidative stress paradigm. In vitro exposure of macrophages to ultrafine or fine TiO(2) in the range of 0.5-200 microg/ml did not significantly alter cell viability. However, ultrafine TiO(2) enhanced intracellular generation of reactive oxygen species (ROS) to a greater extent than fine TiO(2) at each exposure concentration. Ultrafine TiO(2) induced ERK1/2 activation in a concentration-dependent manner, while the fine TiO(2)-induced changes were minimal. Phosphorylation of ERK1/2 occurred following 10 min exposure to higher concentrations of ultrafine TiO(2) (> or = 25 microg/ml). Similarly, ultrafine TiO(2) exposure significantly enhanced tumor necrosis factor (TNF)-alpha and macrophage inflammatory protein (MIP)-2 secretion in a concentration-dependent manner, and its potency was higher than fine TiO(2). These findings suggest that when exposure concentration is based upon equivalent mass, ultrafine TiO(2) exerts greater biological activity as measured by ROS generation, ERK 1/2 activation, and proinflammatory mediator secretion in RAW 264.7 macrophages than fine TiO(2).
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Affiliation(s)
- Jihee Lee Kang
- Department of Physiology, Ewha Medical Research Center, School of Medicine, Ewha Womans University, Seoul, South Korea.
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36
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Taatjes DJ, Sobel BE, Budd RC. Morphological and cytochemical determination of cell death by apoptosis. Histochem Cell Biol 2007; 129:33-43. [PMID: 18000678 PMCID: PMC2137940 DOI: 10.1007/s00418-007-0356-9] [Citation(s) in RCA: 146] [Impact Index Per Article: 8.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 10/29/2007] [Indexed: 12/14/2022]
Abstract
Several modes of cell death are now recognized, including necrosis, apoptosis, and autophagy. Oftentimes the distinctions between these various modes may not be apparent, although the precise mode may be physiologically important. Accordingly, it is often desirable to be able to classify the mode of cell death. Apoptosis was originally defined by structural alterations in cells observable by transmitted light and electron microscopy. Today, a wide variety of imaging and cytochemical techniques are available for the investigation of apoptosis. This review will highlight many of these methods, and provide a critique on the advantages and disadvantages associated with them for the specific identification of apoptotic cells in culture and tissues.
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Affiliation(s)
- Douglas J Taatjes
- Department of Pathology, University of Vermont, 89 Beaumont Avenue, Burlington, VT, 05405, USA.
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37
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Kulich SM, Horbinski C, Patel M, Chu CT. 6-Hydroxydopamine induces mitochondrial ERK activation. Free Radic Biol Med 2007; 43:372-83. [PMID: 17602953 PMCID: PMC2023873 DOI: 10.1016/j.freeradbiomed.2007.04.028] [Citation(s) in RCA: 75] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/08/2007] [Revised: 04/12/2007] [Accepted: 04/13/2007] [Indexed: 01/24/2023]
Abstract
Reactive oxygen species (ROS) are implicated in 6-hydroxydopamine (6-OHDA) injury to catecholaminergic neurons; however, the mechanism(s) are unclear. In addition to ROS generated during autoxidation, 6-OHDA may initiate secondary cellular sources of ROS that contribute to toxicity. Using a neuronal cell line, we found that catalytic metalloporphyrin antioxidants conferred protection if added 1 h after exposure to 6-OHDA, whereas the hydrogen peroxide scavenger catalase failed to protect if added more than 15 min after 6-OHDA. There was a temporal correspondence between loss of protection and loss of the ability of the antioxidant to inhibit 6-OHDA-induced ERK phosphorylation. Time course studies of aconitase inactivation, an indicator of intracellular superoxide, and MitoSOX red, a mitochondria targeted ROS indicator, demonstrate early intracellular ROS followed by a delayed phase of mitochondrial ROS production, associated with phosphorylation of a mitochondrial pool of ERK. Furthermore, on initiation of mitochondrial ROS and ERK activation, 6-OHDA-injured cells became refractory to rescue by metalloporphyrin antioxidants. Together with previous studies showing that inhibition of the ERK pathway confers protection from 6-OHDA toxicity, and that phosphorylated ERK accumulates in mitochondria of degenerating human Parkinson's disease neurons, these studies implicate mitochondrial ERK activation in Parkinsonian oxidative neuronal injury.
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Affiliation(s)
- Scott M Kulich
- Department of Pathology, VA Pittsburgh Healthcare System, Pittsburgh, PA 15240, USA.
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38
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McCubrey JA, Steelman LS, Chappell WH, Abrams SL, Wong EWT, Chang F, Lehmann B, Terrian DM, Milella M, Tafuri A, Stivala F, Libra M, Basecke J, Evangelisti C, Martelli AM, Franklin RA. Roles of the Raf/MEK/ERK pathway in cell growth, malignant transformation and drug resistance. BIOCHIMICA ET BIOPHYSICA ACTA 2007; 1773:1263-84. [PMID: 17126425 PMCID: PMC2696318 DOI: 10.1016/j.bbamcr.2006.10.001] [Citation(s) in RCA: 1669] [Impact Index Per Article: 98.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/05/2006] [Revised: 10/02/2006] [Accepted: 10/03/2006] [Indexed: 02/07/2023]
Abstract
Growth factors and mitogens use the Ras/Raf/MEK/ERK signaling cascade to transmit signals from their receptors to regulate gene expression and prevent apoptosis. Some components of these pathways are mutated or aberrantly expressed in human cancer (e.g., Ras, B-Raf). Mutations also occur at genes encoding upstream receptors (e.g., EGFR and Flt-3) and chimeric chromosomal translocations (e.g., BCR-ABL) which transmit their signals through these cascades. Even in the absence of obvious genetic mutations, this pathway has been reported to be activated in over 50% of acute myelogenous leukemia and acute lymphocytic leukemia and is also frequently activated in other cancer types (e.g., breast and prostate cancers). Importantly, this increased expression is associated with a poor prognosis. The Ras/Raf/MEK/ERK and Ras/PI3K/PTEN/Akt pathways interact with each other to regulate growth and in some cases tumorigenesis. For example, in some cells, PTEN mutation may contribute to suppression of the Raf/MEK/ERK cascade due to the ability of activated Akt to phosphorylate and inactivate different Rafs. Although both of these pathways are commonly thought to have anti-apoptotic and drug resistance effects on cells, they display different cell lineage specific effects. For example, Raf/MEK/ERK is usually associated with proliferation and drug resistance of hematopoietic cells, while activation of the Raf/MEK/ERK cascade is suppressed in some prostate cancer cell lines which have mutations at PTEN and express high levels of activated Akt. Furthermore the Ras/Raf/MEK/ERK and Ras/PI3K/PTEN/Akt pathways also interact with the p53 pathway. Some of these interactions can result in controlling the activity and subcellular localization of Bim, Bak, Bax, Puma and Noxa. Raf/MEK/ERK may promote cell cycle arrest in prostate cells and this may be regulated by p53 as restoration of wild-type p53 in p53 deficient prostate cancer cells results in their enhanced sensitivity to chemotherapeutic drugs and increased expression of Raf/MEK/ERK pathway. Thus in advanced prostate cancer, it may be advantageous to induce Raf/MEK/ERK expression to promote cell cycle arrest, while in hematopoietic cancers it may be beneficial to inhibit Raf/MEK/ERK induced proliferation and drug resistance. Thus the Raf/MEK/ERK pathway has different effects on growth, prevention of apoptosis, cell cycle arrest and induction of drug resistance in cells of various lineages which may be due to the presence of functional p53 and PTEN and the expression of lineage specific factors.
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Affiliation(s)
- James A McCubrey
- Department of Microbiology and Immunology, Leo Jenkins Cancer Center, Brody School of Medicine at East Carolina University, Greenville, NC 27858, USA.
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Tephly LA, Carter AB. Differential expression and oxidation of MKP-1 modulates TNF-alpha gene expression. Am J Respir Cell Mol Biol 2007; 37:366-74. [PMID: 17507666 DOI: 10.1165/rcmb.2006-0268oc] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022] Open
Abstract
Monocytic cells are integral in the pathogenesis of inflammatory disorders. We have shown previously that asbestos-induced p38 mitogen-activated protein (MAP) kinase activation and TNF-alpha expression are mediated by H(2)O(2) in blood monocytes. Due to the high expression and activity of catalase and glutathione peroxidase, normal alveolar macrophages do not respond in a manner similar to that of blood monocytes. Since kinase activity is tightly regulated by phosphatases, we hypothesized that the dual specificity phosphatase MAP kinase phosphatase (MKP)-1 regulates p38 activity and TNF-alpha production in alveolar macrophages due to insufficient H(2)O(2) generation in response to asbestos. We found that MKP-1 was highly expressed in alveolar macrophages, while blood monocytes had minimal expression. Inhibition of expression and activity of MKP-1 or overexpression of a catalytic mutant MKP-1 recovered p38 activity in alveolar macrophages. We questioned whether MKP-1 oxidation played a role dictating the contrasting responses of these cells to asbestos exposure, and found that overexpressed wild-type MKP-1 in monocytes was oxidized, while the mutant MKP-1 remained in the reduced form. Monocytes overexpressing either catalase or wild-type MKP-1 had decreased p38 activation and TNF-alpha production, respectively. In addition, TNF-alpha gene expression was regained in alveolar macrophages overexpressing the catalytic mutant MKP-1. These data suggest that MKP-1, through increased expression and lack of oxidation, modulates the inflammatory response in alveolar macrophages exposed to asbestos.
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Affiliation(s)
- Linda A Tephly
- Department of Medicine, University of Iowa Roy J. and Lucille A. Carver College of Medicine, Iowa City, IA, USA
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Haegens A, Barrett TF, Gell J, Shukla A, Macpherson M, Vacek P, Poynter ME, Butnor KJ, Janssen-Heininger YM, Steele C, Mossman BT. Airway epithelial NF-kappaB activation modulates asbestos-induced inflammation and mucin production in vivo. THE JOURNAL OF IMMUNOLOGY 2007; 178:1800-8. [PMID: 17237430 DOI: 10.4049/jimmunol.178.3.1800] [Citation(s) in RCA: 36] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
Abstract
To investigate the role of bronchiolar epithelial NF-kappaB activity in the development of inflammation and fibrogenesis in a murine model of asbestos inhalation, we used transgenic (Tg) mice expressing an IkappaBalpha mutant (IkappaBalphasr) resistant to phosphorylation-induced degradation and targeted to bronchial epithelium using the CC10 promoter. Sham and chrysotile asbestos-exposed CC10-IkappaBalphasr Tg(+) and Tg(-) mice were examined for altered epithelial cell proliferation and differentiation, cytokine profiles, lung inflammation, and fibrogenesis at 3, 9, and 40 days. KC, IL-6 and IL-1beta were increased (p < or = 0.05) in bronchoalveolar lavage fluid (BALF) from asbestos-exposed mice, but to a lesser extent (p < or = 0.05) in Tg(+) vs Tg(-) mice. Asbestos also caused increases in IL-4, MIP-1beta, and MCP-1 in BALF that were more elevated (p < or = 0.05) in Tg(+) mice at 9 days. Differential cell counts revealed eosinophils in BALF that increased (p < or = 0.05) in Tg(+) mice at 9 days, a time point corresponding with significantly increased numbers of bronchiolar epithelial cells staining positively for mucus production. At all time points, asbestos caused increased numbers of distal bronchiolar epithelial cells and peribronchiolar cells incorporating the proliferation marker, Ki-67. However, bronchiolar epithelial cell and interstitial cell labeling was diminished at 40 days (p < or = 0.05) in Tg(+) vs Tg(-) mice. Our findings demonstrate that airway epithelial NF-kappaB activity plays a role in orchestrating the inflammatory response as well as cell proliferation in response to asbestos.
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Affiliation(s)
- Astrid Haegens
- Department of Pathology, University of Vermont College of Medicine, 89 Beaumont Avenue, Burlington, VT 05405, USA
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McCubrey JA, Steelman LS, Franklin RA, Abrams SL, Chappell WH, Wong EWT, Lehmann BD, Terrian DM, Basecke J, Stivala F, Libra M, Evangelisti C, Martelli AM. Targeting the RAF/MEK/ERK, PI3K/AKT and p53 pathways in hematopoietic drug resistance. ACTA ACUST UNITED AC 2007; 47:64-103. [PMID: 17382374 PMCID: PMC2696319 DOI: 10.1016/j.advenzreg.2006.12.013] [Citation(s) in RCA: 64] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/28/2022]
Affiliation(s)
- James A McCubrey
- Department of Microbiology & Immunology, Brody School of Medicine at East Carolina University Greenville, NC 27858, USA.
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Barlow CA, Barrett TF, Shukla A, Mossman BT, Lounsbury KM. Asbestos-mediated CREB phosphorylation is regulated by protein kinase A and extracellular signal-regulated kinases 1/2. Am J Physiol Lung Cell Mol Physiol 2007; 292:L1361-9. [PMID: 17322281 DOI: 10.1152/ajplung.00279.2006] [Citation(s) in RCA: 29] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022] Open
Abstract
Asbestos is a ubiquitous, naturally occurring fiber that has been linked to the development of malignant and fibrotic lung diseases. Asbestos exposure leads to apoptosis, followed by compensatory proliferation, yet many of the signaling cascades coupled to these outcomes are unclear. Because CREs (Ca(2+)/cAMP-response elements) are found in the promoters of many genes important for regulation of proliferation and apoptosis, CREB (CRE binding protein) is likely to play an important role in the development of asbestos-mediated lung injury. To explore this possibility, we tested the hypotheses that asbestos exposure leads to CREB phosphorylation in lung epithelial cells and that protein kinase A (PKA) and extracellular signal-regulated kinases 1/2 (ERK1/2) are central regulators of the CREB pathway. Persistent CREB phosphorylation was observed in lung sections from mice following inhalation of crocidolite asbestos. Exposure of C10 lung epithelial cells to crocidolite asbestos led to rapid CREB phosphorylation and apoptosis that was decreased by the inhibition of PKA or ERK1/2 using the specific inhibitors H89 and U0126, respectively. Furthermore, crocidolite asbestos selectively induced a sustained increase in MAP kinase phosphatase-1 mRNA and protein. Silencing CREB protein dramatically reduced asbestos-mediated ERK1/2 phosphorylation, yet significantly increased the number of cells undergoing asbestos-induced apoptosis. These data reveal a novel and selective role for CREB in asbestos-mediated signaling through pathways regulated by PKA and ERK1/2, further providing evidence that CREB is an important regulator of apoptosis in asbestos-induced responses of lung epithelial cells.
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Affiliation(s)
- Christy A Barlow
- Department of Pharmacology, University of Vermont, Burlington, Vermont 05405, USA
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Kroczynska B, Cutrone R, Bocchetta M, Yang H, Elmishad AG, Vacek P, Ramos-Nino M, Mossman BT, Pass HI, Carbone M. Crocidolite asbestos and SV40 are cocarcinogens in human mesothelial cells and in causing mesothelioma in hamsters. Proc Natl Acad Sci U S A 2006; 103:14128-33. [PMID: 16966607 PMCID: PMC1599923 DOI: 10.1073/pnas.0604544103] [Citation(s) in RCA: 104] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/05/2006] [Indexed: 11/18/2022] Open
Abstract
Only a fraction of subjects exposed to asbestos develop malignant mesothelioma (MM), suggesting that additional factors may render some individuals more susceptible. We tested the hypothesis that asbestos and Simian virus (SV40) are cocarcinogens. Asbestos and SV40 in combination had a costimulatory effect in inducing ERK1/2 phosphorylation and activator protein-1 (AP-1) activity in both primary Syrian hamster mesothelial cells (SHM) and primary human mesothelial cells (HM). Ap-1 activity caused the expression and activation of matrix metalloprotease (MMP)-1 and MMP-9, which in turn led to cell invasion. Experiments using siRNA and chemical inhibitors confirmed the specificity of these results. The same effects were observed in HM and SHM. Experiments in hamsters showed strong cocarcinogenesis between asbestos and SV40: SV40 did not cause MM, asbestos caused MM in 20% of hamsters, and asbestos and SV40 together caused MM in 90% of hamsters. Significantly lower amounts of asbestos were sufficient to cause MM in animals infected with SV40. Our results indicate that mineral fibers and viruses can be cocarcinogens and suggest that lower amounts of asbestos may be sufficient to cause MM in individuals infected with SV40.
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Affiliation(s)
- Barbara Kroczynska
- *Thoracic Oncology Program, Cardinal Bernardin Cancer Center, Loyola University Chicago, Maywood, IL 60153
| | - Rochelle Cutrone
- *Thoracic Oncology Program, Cardinal Bernardin Cancer Center, Loyola University Chicago, Maywood, IL 60153
| | - Maurizio Bocchetta
- *Thoracic Oncology Program, Cardinal Bernardin Cancer Center, Loyola University Chicago, Maywood, IL 60153
| | - Haining Yang
- *Thoracic Oncology Program, Cardinal Bernardin Cancer Center, Loyola University Chicago, Maywood, IL 60153
| | - Amira G. Elmishad
- *Thoracic Oncology Program, Cardinal Bernardin Cancer Center, Loyola University Chicago, Maywood, IL 60153
| | | | - Maria Ramos-Nino
- Pathology, College of Medicine, University of Vermont, Burlington, VT 05404; and
| | - Brooke T. Mossman
- Pathology, College of Medicine, University of Vermont, Burlington, VT 05404; and
| | - Harvey I. Pass
- Department of Thoracic Surgery, New York University, New York, NY 10016
| | - Michele Carbone
- *Thoracic Oncology Program, Cardinal Bernardin Cancer Center, Loyola University Chicago, Maywood, IL 60153
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McCubrey JA, Lahair MM, Franklin RA. Reactive oxygen species-induced activation of the MAP kinase signaling pathways. Antioxid Redox Signal 2006; 8:1775-89. [PMID: 16987031 DOI: 10.1089/ars.2006.8.1775] [Citation(s) in RCA: 607] [Impact Index Per Article: 33.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/07/2023]
Abstract
An abundance of scientific literature exists demonstrating that oxidative stress influences the MAPK signaling pathways. This review summarizes these findings for the ERK, JNK, p38, and BMK1 pathways. For each of these different MAPK signaling pathways, the following is reviewed: the proteins involved in the signaling pathways, how oxidative stress can activate cellular signaling via these pathways, the types of oxidative stress that are known to induce activation of the different pathways, and the specific cell types in which oxidants induce MAPK responses. In addition, the functional outcome of oxidative stress-induced activation of these pathways is discussed. The purpose of this review is to provide the reader with an overall understanding and appreciation of oxidative stress-induced MAPK signaling.
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Affiliation(s)
- James A McCubrey
- Department of Microbiology and Immunology, and the Leo W. Jenkins Cancer Center, Brody School of Medicine at East Carolina University, Greenville, North Carolina 27834, USA
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Mossman BT, Lounsbury KM, Reddy SP. Oxidants and signaling by mitogen-activated protein kinases in lung epithelium. Am J Respir Cell Mol Biol 2006; 34:666-9. [PMID: 16484683 PMCID: PMC2644227 DOI: 10.1165/rcmb.2006-0047sf] [Citation(s) in RCA: 126] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/31/2006] [Accepted: 01/31/2006] [Indexed: 12/27/2022] Open
Abstract
Oxidants in cigarette smoke and generated from asbestos fibers activate mitogen-activated protein kinase (MAPK) signaling cascades in lung epithelial cells in vitro and in vivo. These signaling pathways lead to the enhanced ability of Jun and Fos family members (i.e., components of the activator protein [AP]-1 transcription factor) to activate transcription of a number of AP-1-dependent target genes involved in cell proliferation or death, differentiation, and inflammation. Research by the Basbaum laboratory has been critical in showing that mucin transcription in response to cigarette smoke and gram-positive bacteria is mediated through activation of the epidermal growth factor receptor and MAPK cascades. Work from our laboratories supports the concept that MAPK signaling and AP-1 transactivation by cigarette smoke and asbestos may synergize in lung epithelial cell injury, compensatory proliferation of lung epithelial cells, and carcinogenesis, supporting a mechanistic framework for the striking increases in lung cancer incidence in asbestos workers who smoke. Targeting of MAPKs and inter-related signaling cascades may be critical to the prevention of lung cancers and control of mucin overproduction in a number of lung diseases including asthma, cystic fibrosis, chronic bronchitis, and chronic obstructive pulmonary disease.
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Affiliation(s)
- Brooke T Mossman
- Department of Pathology, University of Vermont College of Medicine, Burlington, VT 05405, USA.
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46
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Haegens A, van der Vliet A, Butnor KJ, Heintz N, Taatjes D, Hemenway D, Vacek P, Freeman BA, Hazen SL, Brennan ML, Mossman BT. Asbestos-induced lung inflammation and epithelial cell proliferation are altered in myeloperoxidase-null mice. Cancer Res 2005; 65:9670-7. [PMID: 16266986 DOI: 10.1158/0008-5472.can-05-1751] [Citation(s) in RCA: 39] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
Asbestos fibers are carcinogens causing oxidative stress and inflammation, but the sources and ramifications of oxidant production by asbestos are poorly understood. Here, we show that inhaled chrysotile asbestos fibers cause increased myeloperoxidase activity in bronchoalveolar lavage fluids (BALF) and myeloperoxidase immunoreactivity in epithelial cells lining distal bronchioles and alveolar ducts, sites of initial lung deposition of asbestos fibers. In comparison with sham mice, asbestos-exposed myeloperoxidase-null (MPO-/-) and normal (MPO+/+) mice exhibited comparable increases in polymorphonuclear leukocytes, predominately neutrophils, in BALF after 9 days of asbestos inhalation. Differential cell counts on BALF revealed decreased proportions of macrophages and increased lymphocytes in all mice exposed to asbestos, but numbers were decreased overall in asbestos-exposed myeloperoxidase-null versus normal mice. Asbestos-associated lung inflammation in myeloperoxidase-null mice was reduced (P < or = 0.05) in comparison with normal asbestos-exposed mice at 9 days. Decreased lung inflammation in asbestos-exposed myeloperoxidase-null mice at 9 days was accompanied by increases (P < or = 0.05) in Ki-67- and cyclin D1-positive immunoreactive cells, markers of cell cycle reentry, in the distal bronchiolar epithelium. Asbestos-induced epithelial cell proliferation in myeloperoxidase-null mice at 30 days was comparable to that found at 9 days. In contrast, inflammation and epithelial cell proliferation in asbestos-exposed normal mice increased over time. These results support the hypothesis that myeloperoxidase status modulates early asbestos-induced oxidative stress, epithelial cell proliferation, and inflammation.
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Affiliation(s)
- Astrid Haegens
- Department of Pathology, College of Medicine, University of Vermont, Burlington, Vermont 05404, USA
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Barlow CA, Shukla A, Mossman BT, Lounsbury KM. Oxidant-mediated cAMP response element binding protein activation: calcium regulation and role in apoptosis of lung epithelial cells. Am J Respir Cell Mol Biol 2005; 34:7-14. [PMID: 16151051 PMCID: PMC2644191 DOI: 10.1165/rcmb.2005-0153oc] [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: 11/24/2022] Open
Abstract
Oxidant stress-mediated regulation of extracellular signal-regulated kinases (ERK1/2) is linked to pathologic outcomes in lung epithelium, yet a role for Ca2+ and Ca2+/cAMP-response element binding protein (CREB) in ERK1/2 signaling has not been defined. In this study, we tested the hypotheses that oxidants induce Ca2+-mediated phosphorylation of ERK and CREB, and that CREB is required for oxidant-induced proliferation and apoptosis. H2O2 initiated an influx of extracellular Ca2+ that was required for phosphorylation of both ERK and CREB in C10 lung epithelial cells. H2O2-mediated CREB phosphorylation was sensitive to MEK inhibition, suggesting that crosstalk between Ca2+, ERK, and CREB signaling pathways contributes to the oxidant-induced response. Reduction of CREB activity, using a dominant-negative CREB construct, inhibited c-fos steady-state mRNA levels, but unexpectedly enhanced bcl-2 steady-state mRNA levels after H2O2 exposure. Whereas inhibition of CREB activity had no detectable effect on H2O2 stimulation of cell cycle, loss of CREB activity significantly reduced the number of cells undergoing apoptosis. These data support a novel communication between Ca2+-ERK1/2 and CREB elicited by H2O2, and further provide evidence that CREB is an important regulator of apoptosis in oxidant-mediated responses of lung epithelial cells.
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Affiliation(s)
- Christy A Barlow
- Department of Pharmacology, University of Vermont, Burlington, VT 05405, USA
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48
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Cristaudo A, Foddis R, Vivaldi A, Buselli R, Gattini V, Guglielmi G, Cosentino F, Ottenga F, Ciancia E, Libener R, Filiberti R, Neri M, Betta P, Tognon M, Mutti L, Puntoni R. SV40 Enhances the Risk of Malignant Mesothelioma among People Exposed to Asbestos: A Molecular Epidemiologic Case-Control Study. Cancer Res 2005; 65:3049-52. [PMID: 15833832 DOI: 10.1158/0008-5472.can-04-2219] [Citation(s) in RCA: 76] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
We conducted a case-control study on asbestos exposure and presence of SV40 in tumor samples of malignant mesotheliomas (MMs) and bladder urotheliomas (BUs). PCR analysis revealed the presence of SV40 DNA (SV40+) in eight (42.1%) MMs and 6 (33.3%) BUs. The odds ratio for MM Asb- and SV40+ was 0.4 [95% confidence interval (95% CI), 0.03-4.0], for Asb+ and SV40- was 3.6 (95% CI, 0.6-21.0), and for Asb+ and SV40+ was 12.6 (95% CI, 1.2-133.9). Our results suggest that SV40 increases the risk of MM among individuals exposed to asbestos.
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Affiliation(s)
- Alfonso Cristaudo
- Department of Endocrinology and Metabolism, Orthopedic and Traumatology, Occupational Medicine, University of Pisa, 56100 Pisa, Italy.
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Upadhyay D, Panduri V, Kamp DW. Fibroblast Growth Factor-10 Prevents Asbestos-Induced Alveolar Epithelial Cell Apoptosis by a Mitogen-Activated Protein Kinase–Dependent Mechanism. Am J Respir Cell Mol Biol 2005; 32:232-8. [PMID: 15618436 DOI: 10.1165/rcmb.2004-0242oc] [Citation(s) in RCA: 30] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/05/2023] Open
Abstract
Asbestos induces alveolar epithelial cell (AEC) DNA damage and apoptosis by the mitochondria-regulated death pathway and oxidative stress. Fibroblast growth factor-10 (FGF-10), an alveolar epithelial type II cell mitogen that is required for the lung development, prevents H(2)O(2)-induced AEC DNA damage by a mitogen activated protein kinase (MAPK)/extracellular signal-regulated kinase (ERK)-dependent mechanism. In this study, we show that FGF-10 attenuates asbestos-induced AEC DNA strand break formation and apoptosis. MAPK/ERK kinase (MEK) inhibitors, U0126 or PD98059, each blocked the protective effect of FGF-10 against asbestos-induced DNA damage and apoptosis, whereas a p38-MAPK inhibitor had a negligible effect, suggesting a crucial role for MEK/ERK activation in mediating the protective effects of FGF-10. Further, we show that FGF-10 attenuates asbestos-induced change in AEC mitochondrial membrane potential and caspase 9 activation, both of which are blocked by U0126. We conclude that FGF-10 decreases asbestos-induced AEC DNA damage and apoptosis in part by mechanisms involving MEK/ERK-dependent signaling that affects the mitochondria-regulated death pathway.
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Affiliation(s)
- Daya Upadhyay
- Pulmonary and Critical Care Medicine, Northwestern University Feinberg School of Medicine, 240 E. Huron Street, McGaw 2-2300, Chicago, IL 60611, USA
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Sigaud S, Evelson P, González-Flecha B. H2O2-induced proliferation of primary alveolar epithelial cells is mediated by MAP kinases. Antioxid Redox Signal 2005; 7:6-13. [PMID: 15650391 DOI: 10.1089/ars.2005.7.6] [Citation(s) in RCA: 48] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Abstract
Exposure to supraphysiological oxygen concentrations during ventilatory oxygen therapy often causes tissue damage. Alveolar type II (AT II) cells are a major target for oxidant injury, and their ability to proliferate plays a critical role during the repair phase following injury. We hypothesized that reactive oxygen species (ROS), which are produced during hyperoxia, not only cause cellular damage, but may also play a role in the repair process by promoting AT II cell proliferation. We have tested the ability of ROS to induce proliferation in primary cultures of AT II cells by using a wide range of chronic and acute hydrogen peroxide (H2O2) exposures to mimic different types of oxidative stress. We found that chronic exposure to an extracellular flux of 10 microM H2O2/h can significantly increase the intracellular concentration of oxidants, DNA synthesis, and cell proliferation. H2O2-induced AT II cell proliferation was preceded by activation of the mitogen-activated protein kinase ERK (extracellular signal-regulated kinase). Inhibition of ERK and p38 activation prevented H2O2-induced proliferation. These results show that changes in intracellular oxidant concentrations can modulate downstream signaling pathways controlling AT II cell proliferation. This mechanism could be important in the repair process following hyperoxia-induced injury.
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Affiliation(s)
- Samuel Sigaud
- Physiology Program, Department of Environmental Health, Harvard School of Public Health, Boston, MA 02115, USA
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