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Barguilla I, Maguer-Satta V, Guyot B, Pastor S, Marcos R, Hernández A. In Vitro Approaches to Determine the Potential Carcinogenic Risk of Environmental Pollutants. Int J Mol Sci 2023; 24:ijms24097851. [PMID: 37175558 PMCID: PMC10178670 DOI: 10.3390/ijms24097851] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/20/2023] [Revised: 04/22/2023] [Accepted: 04/23/2023] [Indexed: 05/15/2023] Open
Abstract
One important environmental/health challenge is to determine, in a feasible way, the potential carcinogenic risk associated with environmental agents/exposures. Since a significant proportion of tumors have an environmental origin, detecting the potential carcinogenic risk of environmental agents is mandatory, as regulated by national and international agencies. The challenge mainly implies finding a way of how to overcome the inefficiencies of long-term trials with rodents when thousands of agents/exposures need to be tested. To such an end, the use of in vitro cell transformation assays (CTAs) was proposed, but the existing prevalidated CTAs do not cover the complexity associated with carcinogenesis processes and present serious limitations. To overcome such limitations, we propose to use a battery of assays covering most of the hallmarks of the carcinogenesis process. For the first time, we grouped such assays as early, intermediate, or advanced biomarkers which allow for the identification of the cells in the initiation, promotion or aggressive stages of tumorigenesis. Our proposal, as a novelty, points out that using a battery containing assays from all three groups can identify if a certain agent/exposure can pose a carcinogenic risk; furthermore, it can gather mechanistic insights into the mode of the action of a specific carcinogen. This structured battery could be very useful for any type of in vitro study, containing human cell lines aiming to detect the potential carcinogenic risks of environmental agents/exposures. In fact, here, we include examples in which these approaches were successfully applied. Finally, we provide a series of advantages that, we believe, contribute to the suitability of our proposed approach for the evaluation of exposure-induced carcinogenic effects and for the development of an alternative strategy for conducting an exposure risk assessment.
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Affiliation(s)
- Irene Barguilla
- Group of Mutagenesis, Department of Genetics and Microbiology, Faculty of Biosciences, Universitat Autònoma de Barcelona, 08193 Cerdanyola del Vallès, Spain
- CNRS UMR5286, Centre de Recherche en Cancérologie de Lyon, 69008 Lyon, France
| | | | - Boris Guyot
- CNRS UMR5286, Centre de Recherche en Cancérologie de Lyon, 69008 Lyon, France
| | - Susana Pastor
- Group of Mutagenesis, Department of Genetics and Microbiology, Faculty of Biosciences, Universitat Autònoma de Barcelona, 08193 Cerdanyola del Vallès, Spain
| | - Ricard Marcos
- Group of Mutagenesis, Department of Genetics and Microbiology, Faculty of Biosciences, Universitat Autònoma de Barcelona, 08193 Cerdanyola del Vallès, Spain
| | - Alba Hernández
- Group of Mutagenesis, Department of Genetics and Microbiology, Faculty of Biosciences, Universitat Autònoma de Barcelona, 08193 Cerdanyola del Vallès, Spain
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2
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Sweeney C, Lazennec G, Vogel CFA. Environmental exposure and the role of AhR in the tumor microenvironment of breast cancer. Front Pharmacol 2022; 13:1095289. [PMID: 36588678 PMCID: PMC9797527 DOI: 10.3389/fphar.2022.1095289] [Citation(s) in RCA: 7] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/11/2022] [Accepted: 12/05/2022] [Indexed: 12/23/2022] Open
Abstract
Activation of the aryl hydrocarbon receptor (AhR) through environmental exposure to chemicals including polycyclic aromatic hydrocarbons (PAHs) and polychlorinated dibenzo-p-dioxins (PCDDs) can lead to severe adverse health effects and increase the risk of breast cancer. This review considers several mechanisms which link the tumor promoting effects of environmental pollutants with the AhR signaling pathway, contributing to the development and progression of breast cancer. We explore AhR's function in shaping the tumor microenvironment, modifying immune tolerance, and regulating cancer stemness, driving breast cancer chemoresistance and metastasis. The complexity of AhR, with evidence for both oncogenic and tumor suppressor roles is discussed. We propose that AhR functions as a "molecular bridge", linking disproportionate toxin exposure and policies which underlie environmental injustice with tumor cell behaviors which drive poor patient outcomes.
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Affiliation(s)
- Colleen Sweeney
- Department of Biochemistry and Molecular Medicine, School of Medicine, University of California Davis, Sacramento, CA, United States
| | - Gwendal Lazennec
- Centre National de la Recherche Scientifique, SYS2DIAG-ALCEN, Cap Delta, Montpellier, France
| | - Christoph F. A. Vogel
- Center for Health and the Environment, University of California Davis, Davis, CA, United States
- Department of Environmental Toxicology, University of California Davis, Davis, CA, United States
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3
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Salcedo-Bellido I, Amaya E, Pérez-Díaz C, Soler A, Vela-Soria F, Requena P, Barrios-Rodríguez R, Echeverría R, Pérez-Carrascosa FM, Quesada-Jiménez R, Martín-Olmedo P, Arrebola JP. Differential Bioaccumulation Patterns of α, β-Hexachlorobenzene and Dicofol in Adipose Tissue from the GraMo Cohort (Southern Spain). INTERNATIONAL JOURNAL OF ENVIRONMENTAL RESEARCH AND PUBLIC HEALTH 2022; 19:3344. [PMID: 35329028 PMCID: PMC8954870 DOI: 10.3390/ijerph19063344] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 01/31/2022] [Revised: 03/04/2022] [Accepted: 03/08/2022] [Indexed: 02/01/2023]
Abstract
To identify bioaccumulation patterns of α-, β- hexachlorocyclohexane (HCH) and dicofol in relation to sociodemographic, dietary, and lifestyle factors, adipose tissue samples of 387 subjects from GraMo cohort in Southern Spain were analyzed. Potential predictors of these organochlorine pesticides (OCP) levels were collected by face-to-face interviews and assessed by multivariable linear and logistic regression. OCPs were detected in 84.2% (β-HCH), 21.7% (α-HCH), and 19.6% (dicofol) of the population. β-HCH levels were positively related to age, body mass index (BMI), mother's occupation in agriculture during pregnancy, living in Poniente and Alpujarras, white fish, milk and water consumption, and negatively related to being male, living near to an agricultural area, working ≥10 years in agriculture, and beer consumption. Detectable α-HCH levels were positively related to age, BMI, milk consumption, mother's occupation in agriculture during pregnancy, and negatively with residence in Poniente and Alpujarras, Granada city, and Granada Metropolitan Area. Residence near to an agricultural area, smoking habit, white fish and water consumption, and living in Poniente and Alpujarras, Granada city and Granada Metropolitan Area were negatively associated with detectable dicofol levels. Our study revealed different bioaccumulation patterns of α, β-HCH and dicofol, probably due to their dissimilar period of use, and emphasize the need for assessing the exposure to frequently overlooked pollutants.
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Affiliation(s)
- Inmaculada Salcedo-Bellido
- Departamento de Medicina Preventiva y Salud Pública, Universidad de Granada, 18071 Granada, Spain; (I.S.-B.); (C.P.-D.); (A.S.); (P.R.); (R.B.-R.); (R.E.); (F.M.P.-C.)
- Consortium for Biomedical Research in Epidemiology and Public Health (CIBERESP), 28029 Madrid, Spain
- Instituto de Investigación Biosanitaria (ibs. GRANADA), 18014 Granada, Spain; (E.A.); (F.V.-S.); (R.Q.-J.); (P.M.-O.)
| | - Esperanza Amaya
- Instituto de Investigación Biosanitaria (ibs. GRANADA), 18014 Granada, Spain; (E.A.); (F.V.-S.); (R.Q.-J.); (P.M.-O.)
| | - Celia Pérez-Díaz
- Departamento de Medicina Preventiva y Salud Pública, Universidad de Granada, 18071 Granada, Spain; (I.S.-B.); (C.P.-D.); (A.S.); (P.R.); (R.B.-R.); (R.E.); (F.M.P.-C.)
- Instituto de Investigación Biosanitaria (ibs. GRANADA), 18014 Granada, Spain; (E.A.); (F.V.-S.); (R.Q.-J.); (P.M.-O.)
| | - Anabel Soler
- Departamento de Medicina Preventiva y Salud Pública, Universidad de Granada, 18071 Granada, Spain; (I.S.-B.); (C.P.-D.); (A.S.); (P.R.); (R.B.-R.); (R.E.); (F.M.P.-C.)
| | - Fernando Vela-Soria
- Instituto de Investigación Biosanitaria (ibs. GRANADA), 18014 Granada, Spain; (E.A.); (F.V.-S.); (R.Q.-J.); (P.M.-O.)
- Biomedical Research Center (CIBM), University of Granada, 18016 Granada, Spain
| | - Pilar Requena
- Departamento de Medicina Preventiva y Salud Pública, Universidad de Granada, 18071 Granada, Spain; (I.S.-B.); (C.P.-D.); (A.S.); (P.R.); (R.B.-R.); (R.E.); (F.M.P.-C.)
- Instituto de Investigación Biosanitaria (ibs. GRANADA), 18014 Granada, Spain; (E.A.); (F.V.-S.); (R.Q.-J.); (P.M.-O.)
| | - Rocío Barrios-Rodríguez
- Departamento de Medicina Preventiva y Salud Pública, Universidad de Granada, 18071 Granada, Spain; (I.S.-B.); (C.P.-D.); (A.S.); (P.R.); (R.B.-R.); (R.E.); (F.M.P.-C.)
- Consortium for Biomedical Research in Epidemiology and Public Health (CIBERESP), 28029 Madrid, Spain
- Instituto de Investigación Biosanitaria (ibs. GRANADA), 18014 Granada, Spain; (E.A.); (F.V.-S.); (R.Q.-J.); (P.M.-O.)
| | - Ruth Echeverría
- Departamento de Medicina Preventiva y Salud Pública, Universidad de Granada, 18071 Granada, Spain; (I.S.-B.); (C.P.-D.); (A.S.); (P.R.); (R.B.-R.); (R.E.); (F.M.P.-C.)
| | - Francisco M. Pérez-Carrascosa
- Departamento de Medicina Preventiva y Salud Pública, Universidad de Granada, 18071 Granada, Spain; (I.S.-B.); (C.P.-D.); (A.S.); (P.R.); (R.B.-R.); (R.E.); (F.M.P.-C.)
- Instituto de Investigación Biosanitaria (ibs. GRANADA), 18014 Granada, Spain; (E.A.); (F.V.-S.); (R.Q.-J.); (P.M.-O.)
- Servicio de Oncología Radioterápica, Hospital Universitario Virgen de las Nieves, 18014 Granada, Spain
| | - Raquel Quesada-Jiménez
- Instituto de Investigación Biosanitaria (ibs. GRANADA), 18014 Granada, Spain; (E.A.); (F.V.-S.); (R.Q.-J.); (P.M.-O.)
| | - Piedad Martín-Olmedo
- Instituto de Investigación Biosanitaria (ibs. GRANADA), 18014 Granada, Spain; (E.A.); (F.V.-S.); (R.Q.-J.); (P.M.-O.)
- Andalusian School of Public Health (EASP), 18011 Granada, Spain
| | - Juan Pedro Arrebola
- Departamento de Medicina Preventiva y Salud Pública, Universidad de Granada, 18071 Granada, Spain; (I.S.-B.); (C.P.-D.); (A.S.); (P.R.); (R.B.-R.); (R.E.); (F.M.P.-C.)
- Consortium for Biomedical Research in Epidemiology and Public Health (CIBERESP), 28029 Madrid, Spain
- Instituto de Investigación Biosanitaria (ibs. GRANADA), 18014 Granada, Spain; (E.A.); (F.V.-S.); (R.Q.-J.); (P.M.-O.)
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Keswani C, Dilnashin H, Birla H, Roy P, Tyagi RK, Singh D, Rajput VD, Minkina T, Singh SP. Global footprints of organochlorine pesticides: a pan-global survey. ENVIRONMENTAL GEOCHEMISTRY AND HEALTH 2022; 44:149-177. [PMID: 34027568 DOI: 10.1007/s10653-021-00946-7] [Citation(s) in RCA: 25] [Impact Index Per Article: 12.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/30/2020] [Accepted: 04/19/2021] [Indexed: 05/16/2023]
Abstract
Organochlorine pesticides (OCPs) are ubiquitous environmental contaminants widely used all over the world. These chlorinated hydrocarbons are toxic and often cause detrimental health effects because of their long shelf life and bioaccumulation in the adipose tissues of primates. OCP exposure to humans occurs through skin, inhalation and contaminated foods including milk and dairy products, whereas developing fetus and neonates are exposed through placental transfer and lactation, respectively. In 1960s, OCPs were banned in most developed countries, but because they are cheap and easily available, they are still widely used in most third world countries. The overuse or misuse of OCPs has been rising continuously which pose threats to environmental and human health. This review reports the comparative occurrence of OCPs in human and bovine milk samples around the globe and portrays the negative impacts encountered through the long history of OCP use.
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Affiliation(s)
- Chetan Keswani
- Department of Biochemistry, Institute of Science, Banaras Hindu University, Varanasi, 221005, India
| | - Hagera Dilnashin
- Department of Biochemistry, Institute of Science, Banaras Hindu University, Varanasi, 221005, India
| | - Hareram Birla
- Department of Biochemistry, Institute of Science, Banaras Hindu University, Varanasi, 221005, India
| | - Partha Roy
- Department of Biotechnology, Indian Institute of Technology-Roorkee, Roorkee, 247667, India
| | - Rakesh K Tyagi
- Special Centre for Molecular Medicine, Jawaharlal Nehru University, New Delhi, 110067, India
| | - Dheer Singh
- Animal Biochemistry Division, National Dairy Research Institute, Karnal, 132001, India
| | - Vishnu D Rajput
- Academy of Biology and Biotechnology, Southern Federal University, Rostov-on-Don, 344006, Russia
| | - Tatiana Minkina
- Academy of Biology and Biotechnology, Southern Federal University, Rostov-on-Don, 344006, Russia
| | - Surya P Singh
- Department of Biochemistry, Institute of Science, Banaras Hindu University, Varanasi, 221005, India.
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Rubini E, Minacori M, Paglia G, Macone A, Chichiarelli S, Altieri F, Eufemi M. Tomato and Olive Bioactive Compounds: A Natural Shield against the Cellular Effects Induced by β-Hexachlorocyclohexane-Activated Signaling Pathways. Molecules 2021; 26:molecules26237135. [PMID: 34885717 PMCID: PMC8658925 DOI: 10.3390/molecules26237135] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/03/2021] [Revised: 11/19/2021] [Accepted: 11/22/2021] [Indexed: 01/11/2023] Open
Abstract
The β-isomer of hexachlorocyclohexane (β-HCH) is a globally widespread pollutant that embodies all the physicochemical characteristics of organochlorine pesticides, constituting an environmental risk factor for a wide range of noncommunicable diseases. Previous in vitro studies from our group disclosed the carcinogenic potential of β-HCH, which contributes to neoplastic transformation by means of multifaceted intracellular mechanisms. Considering the positive evidence regarding the protective role of natural bioactive compounds against pollution-induced toxicity, micronutrients from olive and tomato endowed with the capability of modulating β-HCH cellular targets were tested. For this purpose, the solution obtained from a patented food supplement (No. EP2851080A1), referred to as Tomato and Olive Bioactive Compounds (TOBC), was administered to the androgen-sensitive prostate cancer cells LNCaP and different biochemical and cellular assays were performed to evaluate its efficiency. TOBC shows a dose-dependent significant chemoprotection by contrasting β-HCH-induced intracellular responses such as STAT3 and AhR activation, disruption of AR signaling, antiapoptotic and proliferative activity, and increase in ROS production and DNA damage. These experimental outcomes identified TOBC as a suitable functional food to be included in a diet regimen aimed at defending cells from β-HCH negative effects, recommending the development of tailored enriched formulations for exposed individuals.
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Affiliation(s)
- Elisabetta Rubini
- Department of Biochemical Science “A. Rossi Fanelli”, Faculty of Pharmacy and Medicine, Sapienza University of Rome, P.le Aldo Moro 5, 00185 Rome, Italy; (E.R.); (M.M.); (G.P.); (A.M.); (S.C.); (M.E.)
- Enrico ed Enrica Sovena Foundation, 00199 Rome, Italy
- Fondazione Federico Calabresi Onlus, 00186 Rome, Italy
| | - Marco Minacori
- Department of Biochemical Science “A. Rossi Fanelli”, Faculty of Pharmacy and Medicine, Sapienza University of Rome, P.le Aldo Moro 5, 00185 Rome, Italy; (E.R.); (M.M.); (G.P.); (A.M.); (S.C.); (M.E.)
| | - Giuliano Paglia
- Department of Biochemical Science “A. Rossi Fanelli”, Faculty of Pharmacy and Medicine, Sapienza University of Rome, P.le Aldo Moro 5, 00185 Rome, Italy; (E.R.); (M.M.); (G.P.); (A.M.); (S.C.); (M.E.)
| | - Alberto Macone
- Department of Biochemical Science “A. Rossi Fanelli”, Faculty of Pharmacy and Medicine, Sapienza University of Rome, P.le Aldo Moro 5, 00185 Rome, Italy; (E.R.); (M.M.); (G.P.); (A.M.); (S.C.); (M.E.)
| | - Silvia Chichiarelli
- Department of Biochemical Science “A. Rossi Fanelli”, Faculty of Pharmacy and Medicine, Sapienza University of Rome, P.le Aldo Moro 5, 00185 Rome, Italy; (E.R.); (M.M.); (G.P.); (A.M.); (S.C.); (M.E.)
| | - Fabio Altieri
- Department of Biochemical Science “A. Rossi Fanelli”, Faculty of Pharmacy and Medicine, Sapienza University of Rome, P.le Aldo Moro 5, 00185 Rome, Italy; (E.R.); (M.M.); (G.P.); (A.M.); (S.C.); (M.E.)
- Correspondence:
| | - Margherita Eufemi
- Department of Biochemical Science “A. Rossi Fanelli”, Faculty of Pharmacy and Medicine, Sapienza University of Rome, P.le Aldo Moro 5, 00185 Rome, Italy; (E.R.); (M.M.); (G.P.); (A.M.); (S.C.); (M.E.)
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6
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Vogel CFA, Lazennec G, Kado SY, Dahlem C, He Y, Castaneda A, Ishihara Y, Vogeley C, Rossi A, Haarmann-Stemmann T, Jugan J, Mori H, Borowsky AD, La Merrill MA, Sweeney C. Targeting the Aryl Hydrocarbon Receptor Signaling Pathway in Breast Cancer Development. Front Immunol 2021; 12:625346. [PMID: 33763068 PMCID: PMC7982668 DOI: 10.3389/fimmu.2021.625346] [Citation(s) in RCA: 13] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/02/2020] [Accepted: 02/11/2021] [Indexed: 01/09/2023] Open
Abstract
Activation of the aryl hydrocarbon receptor (AhR) through environmental exposure to known human carcinogens including dioxins can lead to the promotion of breast cancer. While the repressor protein of the AhR (AhRR) blocks the canonical AhR pathway, the function of AhRR in the development of breast cancer is not well-known. In the current study we examined the impact of suppressing AhR activity using its dedicated repressor protein AhRR. AhRR is a putative tumor suppressor and is silenced in several cancer types, including breast, where its loss correlates with shorter patient survival. Using the AhRR transgenic mouse, we demonstrate that AhRR overexpression opposes AhR-driven and inflammation-induced growth of mammary tumors in two different murine models of breast cancer. These include a syngeneic model using E0771 mammary tumor cells as well as the Polyoma Middle T antigen (PyMT) transgenic model. Further AhRR overexpression or knockout of AhR in human breast cancer cells enhanced apoptosis induced by chemotherapeutics and inhibited the growth of mouse mammary tumor cells. This study provides the first in vivo evidence that AhRR suppresses mammary tumor development and suggests that strategies which lead to its functional restoration and expression may have therapeutic benefit.
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MESH Headings
- Animals
- Animals, Genetically Modified
- Antigens, Polyomavirus Transforming/genetics
- Antineoplastic Agents/pharmacology
- Apoptosis
- Basic Helix-Loop-Helix Transcription Factors/genetics
- Basic Helix-Loop-Helix Transcription Factors/metabolism
- Breast Neoplasms/drug therapy
- Breast Neoplasms/genetics
- Breast Neoplasms/metabolism
- Breast Neoplasms/pathology
- Cell Proliferation
- Cell Transformation, Neoplastic/genetics
- Cell Transformation, Neoplastic/metabolism
- Cell Transformation, Neoplastic/pathology
- Doxorubicin/pharmacology
- Drug Resistance, Neoplasm
- Etoposide/pharmacology
- Female
- Gene Expression Regulation, Neoplastic
- Humans
- MCF-7 Cells
- Mice, Inbred C57BL
- Receptors, Aryl Hydrocarbon/genetics
- Receptors, Aryl Hydrocarbon/metabolism
- Repressor Proteins/genetics
- Repressor Proteins/metabolism
- Signal Transduction/drug effects
- Time Factors
- Tumor Burden
- Tumor Cells, Cultured
- Mice
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Affiliation(s)
- Christoph F. A. Vogel
- Department of Environmental Toxicology, University of California, Davis, Davis, CA, United States
- Center for Health and the Environment, University of California, Davis, Davis, CA, United States
| | | | - Sarah Y. Kado
- Center for Health and the Environment, University of California, Davis, Davis, CA, United States
| | - Carla Dahlem
- Center for Health and the Environment, University of California, Davis, Davis, CA, United States
| | - Yi He
- Center for Health and the Environment, University of California, Davis, Davis, CA, United States
| | - Alejandro Castaneda
- Center for Health and the Environment, University of California, Davis, Davis, CA, United States
| | - Yasuhiro Ishihara
- Center for Health and the Environment, University of California, Davis, Davis, CA, United States
- Graduate School of Integrated Sciences for Life, Hiroshima University, Hiroshima, Japan
| | - Christian Vogeley
- Leibniz Research Institute for Environmental Medicine, Düsseldorf, Germany
| | - Andrea Rossi
- Leibniz Research Institute for Environmental Medicine, Düsseldorf, Germany
| | | | - Juliann Jugan
- Department of Environmental Toxicology, University of California, Davis, Davis, CA, United States
| | - Hidetoshi Mori
- Center for Comparative Medicine, University of California, Davis, Davis, CA, United States
| | - Alexander D. Borowsky
- Center for Comparative Medicine, University of California, Davis, Davis, CA, United States
| | - Michele A. La Merrill
- Department of Environmental Toxicology, University of California, Davis, Davis, CA, United States
| | - Colleen Sweeney
- Department of Biochemistry and Molecular Medicine, School of Medicine, University of California, Davis, Davis, CA, United States
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Li S, Xu D, Guo J, Sun Y. Inhibition of cell growth and induction of inflammation by endosulfan in HUVEC-C cells. ENVIRONMENTAL TOXICOLOGY 2016; 31:1785-1795. [PMID: 26714676 DOI: 10.1002/tox.22180] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/16/2015] [Revised: 07/13/2015] [Accepted: 07/16/2015] [Indexed: 06/05/2023]
Abstract
Endosulfan is one of the organochlorine pesticides. It has been associated with a wide range of adverse health effects. However, it is unknown whether endosulfan causes endothelial dysfunction. In the present study, we investigated the effects of endosulfan on human vascular endothelial cells. We exposed human umbilical vein endothelial cells (HUVEC-C) to varying concentrations of endosulfan for 48 h. The results showed that endosulfan lowered cell viability and inhibited cell proliferation in a dose-dependent manner. Flow cytometric analysis showed that endosulfan at 60 μM induced G1 cell cycle arrest, a response attributed to down-regulation of CDK6 and pRb dephosphorylation. We observed that endosulfan at 40 and 60 μM induced a considerable percentage of cells to undergo apoptosis, as detected by Annexin-V binding assays. Endosulfan reduced mitochondrial transmembrane potential, leading to the release of cytochrome c into the cytoplasm; meanwhile, endosulfan also inhibited the mRNA expression level of survivin, which resulted in the activation of caspase-3. These results indicated that the intrinsic mitochondria-mediated pathway was involved in apoptotic process. Exposure to endosulfan increased the secretion and mRNA expression levels of inflammation factors interleukin (IL)-6 and IL-8, suggesting that endosulfan could cause inflammation. Overall, these findings suggested that endosulfan is toxic to HUVEC-C cells, resulting in endothelial dysfunction. © 2015 Wiley Periodicals, Inc. Environ Toxicol 31: 1785-1795, 2016.
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Affiliation(s)
- Shuai Li
- Institute of Environmental Systems Biology, Environment Science and Engineering College, Dalian Maritime University, Linghai Road 1, Dalian, 116026, Poeple's Republic of China
| | - Dan Xu
- Institute of Environmental Systems Biology, Environment Science and Engineering College, Dalian Maritime University, Linghai Road 1, Dalian, 116026, Poeple's Republic of China
| | - Jianguo Guo
- Institute of Environmental Systems Biology, Environment Science and Engineering College, Dalian Maritime University, Linghai Road 1, Dalian, 116026, Poeple's Republic of China
| | - Yeqing Sun
- Institute of Environmental Systems Biology, Environment Science and Engineering College, Dalian Maritime University, Linghai Road 1, Dalian, 116026, Poeple's Republic of China
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Mouly TA, Toms LML. Breast cancer and persistent organic pollutants (excluding DDT): a systematic literature review. ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH INTERNATIONAL 2016; 23:22385-22407. [PMID: 27628920 DOI: 10.1007/s11356-016-7577-1] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/27/2016] [Accepted: 09/01/2016] [Indexed: 05/20/2023]
Abstract
Persistent organic pollutants (POPs) are a group of heterogeneous compounds of both natural and anthropogenic origin with highly persistent and bioaccumulative properties. They cause a range of adverse effects to human health and the environment around the world. There is growing concern that POPs may increase breast cancer risk due to their xenoestrogenic properties. The aim of this systematic literature review is to summarize and integrate the risks of breast cancer following environmental exposure to POPs (other than DDT) from primary epidemiological studies published between 2006 and 2015. After searching various databases, 14 case-control studies and one cohort study were included. Evidence of an association between increased breast cancer risk and environmental exposure to these chemicals is inconsistent and inadequate to conclude with certainty. However, most of the studies have examined exposure to the pollutants after diagnosis of breast cancer, overlooking exposure during critical windows of vulnerability. They have also largely focused on individual chemicals but ignored the combined effects of different chemicals. Therefore, major data gaps remain in examining exposure during critical windows of vulnerability and assessing combined effects of multiple chemicals. Development of better exposure assessment methods addressing these gaps is required for future research.
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Affiliation(s)
- Tafzila Akter Mouly
- School of Public Health and Social Work, Faculty of Health, Queensland University of Technology (QUT), Victoria Park Rd, Kelvin Grove, Brisbane, QLD 4059, Australia
| | - Leisa-Maree Leontjew Toms
- School of Public Health and Social Work, Faculty of Health, Queensland University of Technology (QUT), Victoria Park Rd, Kelvin Grove, Brisbane, QLD 4059, Australia.
- Institute of Health and Biomedical Innovation, Queensland University of Technology, Brisbane, Australia.
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9
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Rossi C, Danieli PP, Ronchi B. In VitroEffects of the Organochlorine Pesticide β-Hexachlorocyclohexane on Bovine Peripheral Blood Mononuclear Cells. ITALIAN JOURNAL OF ANIMAL SCIENCE 2016. [DOI: 10.4081/ijas.2014.3360] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/22/2023]
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10
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Arrebola JP, Belhassen H, Artacho-Cordón F, Ghali R, Ghorbel H, Boussen H, Perez-Carrascosa FM, Expósito J, Hedhili A, Olea N. Risk of female breast cancer and serum concentrations of organochlorine pesticides and polychlorinated biphenyls: a case-control study in Tunisia. THE SCIENCE OF THE TOTAL ENVIRONMENT 2015; 520:106-13. [PMID: 25804877 DOI: 10.1016/j.scitotenv.2015.03.045] [Citation(s) in RCA: 35] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/08/2015] [Revised: 03/10/2015] [Accepted: 03/10/2015] [Indexed: 05/15/2023]
Abstract
The aim of this study was to investigate the association between serum concentrations of a group of organochlorine pesticides/polychlorinated biphenyls with xenoestrogenic potential and the risk of breast cancer in a female population from Tunisia. The relationship between serum levels of the pollutants and the risk of cancer was assessed using logistic regression analyses. In the unadjusted models, β-hexachlorocyclohexane (β-HCH), hexachlorobenzene, heptachlor, polychlorinated biphenyl congeners 138, 153, and 180, and p,p'-dichlorodiphenyldichloroethylene (p,p'-DDE) were positively associated with breast cancer risk. However, when the models were further adjusted for the selected covariates, only β-HCH and p,p'-DDE remained statistically significant, and heptachlor was borderline significant. In addition, analyses using POP concentration tertiles corroborated a positive dose-response relationship that was significant for p,p'-DDE (p-trend=0.020) and borderline significant for heptachlor (p-trend=0.078). A similar trend was also confirmed for β-HCH, in which concentrations≥limit of detection were positively associated with breast cancer risk (vs. concentrations<limit of detection, OR=3.44, p<0.05). Finally, the relative influence of each chemical in the presence of the others was assessed by entering the three chemicals in a single model with all covariates, and only β-HCH remained positively associated with the risk of cancer (OR:1.18, 95%CI: 1.05-1.34). Our findings suggest a potential association between exposure to at least one organochlorine pesticide and breast cancer risk. However, our results should be interpreted with caution, and further research is warranted to confirm these findings.
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Affiliation(s)
- Juan P Arrebola
- Radiation Oncology Department, Virgen de las Nieves University Hospital, Granada, Spain; San Cecilio University Hospital, Instituto de Investigación Biosanitaria ibs. Granada, University of Granada, CIBERESP, Spain.
| | - Hidaya Belhassen
- Center of Urgent Medical Assistance of Tunis, Laboratory of Toxicology and Environment (LR12SP07), Montfleury, Tunis 1008, Tunisia
| | - Francisco Artacho-Cordón
- San Cecilio University Hospital, Instituto de Investigación Biosanitaria ibs. Granada, University of Granada, CIBERESP, Spain
| | - Ridha Ghali
- Center of Urgent Medical Assistance of Tunis, Laboratory of Toxicology and Environment (LR12SP07), Montfleury, Tunis 1008, Tunisia
| | - Hayet Ghorbel
- Center of Urgent Medical Assistance of Tunis, Laboratory of Toxicology and Environment (LR12SP07), Montfleury, Tunis 1008, Tunisia
| | | | | | - José Expósito
- Radiation Oncology Department, Virgen de las Nieves University Hospital, Granada, Spain
| | - Abderrazek Hedhili
- Center of Urgent Medical Assistance of Tunis, Laboratory of Toxicology and Environment (LR12SP07), Montfleury, Tunis 1008, Tunisia
| | - Nicolás Olea
- San Cecilio University Hospital, Instituto de Investigación Biosanitaria ibs. Granada, University of Granada, CIBERESP, Spain
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Bekki K, Vogel H, Li W, Ito T, Sweeney C, Haarmann-Stemmann T, Matsumura F, Vogel CFA. The aryl hydrocarbon receptor (AhR) mediates resistance to apoptosis induced in breast cancer cells. PESTICIDE BIOCHEMISTRY AND PHYSIOLOGY 2015; 120:5-13. [PMID: 25987214 PMCID: PMC4438266 DOI: 10.1016/j.pestbp.2014.12.021] [Citation(s) in RCA: 74] [Impact Index Per Article: 8.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/19/2014] [Revised: 12/16/2014] [Accepted: 12/17/2014] [Indexed: 05/26/2023]
Abstract
The aryl hydrocarbon receptor (AhR) is well known as a ligand binding transcription factor regulating various biological effects. Previously we have shown that long-term exposure to estrogen in breast cancer cells caused not only down regulation of estrogen receptor (ER) but also overexpression of AhR. The AhR interacts with several cell signaling pathways associated with induction of tyrosine kinases, cytokines and growth factors which may support the survival roles of AhR escaping from apoptosis elicited by a variety of apoptosis inducing agents in breast cancer. In this study, we studied the anti-apoptotic role of AhR in different breast cancer cells when apoptosis was induced by exposure to UV light and chemotherapeutic agents. Activation of AhR by 2,3,7,8-tetrachlorodibenzo-p-dioxin (TCDD) in AhR overexpressing breast cancer cells effectively suppressed the apoptotic response induced by UV-irradiation, doxorubicin, lapatinib and paclitaxel. The anti-apoptotic response of TCDD was uniformly antagonized by the treatment with 3'methoxy-4'nitroflavone (MNF), a specific antagonist of AhR. TCDD's survival action of apoptosis was accompanied with the induction of well-known inflammatory genes, such as cyclooxygenase-2 (COX-2) and NF-κB subunit RelB. Moreover, TCDD increased the activity of the immunosuppressive enzyme indoleamine 2, 3-dioxygenase (IDO), which metabolizes tryptophan to kynurenine (Kyn) and mediates tumor immunity. Kyn also acts as an AhR ligand like TCDD, and kyn induced an anti-apoptotic response in breast cancer cells. Accordingly, our present study suggests that AhR plays a pivotal role in the development of breast cancer via the suppression of apoptosis, and provides an idea that the use of AhR antagonists with chemotherapeutic agents may effectively synergize the elimination of breast cancer cells.
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Affiliation(s)
- Kanae Bekki
- Center for Health and the Environment, University of California Davis, One Shields Avenue, Davis, CA 95616, USA
| | - Helena Vogel
- Center for Health and the Environment, University of California Davis, One Shields Avenue, Davis, CA 95616, USA
| | - Wen Li
- Center for Health and the Environment, University of California Davis, One Shields Avenue, Davis, CA 95616, USA
| | - Tomohiro Ito
- Center for Health and the Environment, University of California Davis, One Shields Avenue, Davis, CA 95616, USA
| | - Colleen Sweeney
- Cancer Research Center, Basic Science Research, Medical School, University of California, Davis, CA 95817, USA
| | - Thomas Haarmann-Stemmann
- Leibniz Research Institute for Environmental Medicine, Auf'm Hennekamp 50, 40225 Düsseldorf, Germany
| | - Fumio Matsumura
- Center for Health and the Environment, University of California Davis, One Shields Avenue, Davis, CA 95616, USA; Department of Environmental Toxicology, University of California Davis, One Shields Avenue, Davis, CA 95616, USA
| | - Christoph F A Vogel
- Center for Health and the Environment, University of California Davis, One Shields Avenue, Davis, CA 95616, USA; Department of Environmental Toxicology, University of California Davis, One Shields Avenue, Davis, CA 95616, USA.
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Chand S, Mustafa MD, Banerjee BD, Guleria K. CYP17A1 gene polymorphisms and environmental exposure to organochlorine pesticides contribute to the risk of small for gestational age. Eur J Obstet Gynecol Reprod Biol 2014; 180:100-5. [PMID: 25064838 DOI: 10.1016/j.ejogrb.2014.06.016] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/03/2013] [Revised: 04/18/2014] [Accepted: 06/19/2014] [Indexed: 11/30/2022]
Abstract
OBJECTIVES The cytochrome P-450c17α enzyme encoded by the cytochrome P-450c17α (CYP17A1) gene plays a role in oestrogen synthesis. Genetic variation in the maternal CYP17A1 gene leads to differences in oestrogen level that affect fetal growth and cause small for gestational age (SGA). Organochlorine pesticides (OCPs) are endocrine disruptors that alter the normal oestrogen-progesterone balance, and are associated with adverse reproductive outcomes. This study was designed to investigate the effect of the gene-environment interaction between maternal CYP17A1 gene polymorphisms and maternal and cord OCP levels on the risk of SGA. STUDY DESIGN Maternal and cord blood samples of 50 term SGA cases (birth weight <10th percentile for gestational age as per Lubchenco's growth chart) and 50 normal pregnancies (controls) were collected. Women with occupational exposure to OCPs, anaemia, hypertension, antiphospholipid antibody syndrome, medical disease, parity of more than four, or a history of smoking, alcohol consumption or chronic drug intake were excluded from both groups. Maternal and cord blood samples were collected at the time of delivery or after delivery, respectively. The OCP levels of the samples were analyzed using a gas chromatography system equipped with an electron capture detector, and polymerase chain reaction-restriction fragment length polymorphism was used for polymorphic analysis of the CYP17A1 gene. RESULTS Significantly (p<0.05) higher levels of α-hexachlorocyclohexane (HCH), β-HCH and γ-HCH were found in maternal and cord blood samples of the SGA cases compared with the controls. The frequency of the A1A2/A2A2 genotype was significantly lower [p=0.041, odds ratio (OR) 0.421, 95% confidence interval (CI) 0.184-0.966] in the SGA cases compared with the controls. When gene-environment interactions between CYP17A1 gene polymorphisms and OCP levels were considered, a significant (p=0.004) association was found between a high level of endosulfan in cord blood and the A1A1 (wild-type) genotype of CYP17A1, leading to an estimated reduction in birth weight of 315g. CONCLUSIONS Higher OCP levels and the A1A1 genotype of CYP17A1 in pregnant women may be considered as important aetiological factors in idiopathic SGA. This study provides evidence that genetic variation and its interaction with environmental exposure may increase the risk of SGA. Further studies are needed with a larger sample size, incorporating other gene polymorphisms and environmental exposures, to strengthen these observations.
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Affiliation(s)
- S Chand
- Environmental Biochemistry and Molecular Biology Laboratory, Department of Biochemistry, University College of Medical Sciences and G.T.B. Hospital (University of Delhi), Delhi, India
| | - M D Mustafa
- Environmental Biochemistry and Molecular Biology Laboratory, Department of Biochemistry, University College of Medical Sciences and G.T.B. Hospital (University of Delhi), Delhi, India
| | - B D Banerjee
- Environmental Biochemistry and Molecular Biology Laboratory, Department of Biochemistry, University College of Medical Sciences and G.T.B. Hospital (University of Delhi), Delhi, India.
| | - K Guleria
- Department of Obstetrics and Gynaecology, University College of Medical Sciences and G.T.B. Hospital (University of Delhi), Delhi, India
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Zhou P, Wu Y, Yin S, Li J, Zhao Y, Zhang L, Chen H, Liu Y, Yang X, Li X. National survey of the levels of persistent organochlorine pesticides in the breast milk of mothers in China. ENVIRONMENTAL POLLUTION (BARKING, ESSEX : 1987) 2011; 159:524-31. [PMID: 21093969 DOI: 10.1016/j.envpol.2010.10.014] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/19/2010] [Revised: 10/04/2010] [Accepted: 10/10/2010] [Indexed: 05/16/2023]
Abstract
The occurrence of persistent organochlorine pesticides (OCPs) in breast milk samples collected from mothers from twelve provinces in mainland China was investigated. Dichlorodiphenyltrichloroethanes (DDTs) were the most prevalent agent, followed by HCHs and HCB, whereas levels of chlordane compounds, drins and mirex were lower. The relatively lower DDE/DDT ratio in the Fujian rural area suggested more recent exposure to DDT than in other areas. The mean level of DDTs in breast milk from the southern China was higher than those from northern China (p < 0.05). A positive correlation was observed between concentration of DDTs in human milk and consumption of animal-origin food, suggesting that this parameter could play an important part in influencing OCPs burdens in lactating women. The mean estimated daily intakes of different OCPs for breastfed infants were lower than the tolerable daily intake.
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Affiliation(s)
- Pingping Zhou
- Key Laboratory of Chemical Safety and Health, and National Institute of Nutrition and Food Safety, Chinese Center for Disease Control and Prevention, 7 Panjiayuan nanli Road, Chaoyang District, Beijing 100021, China
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Dong J, Gao H, Wang S, Yao H, Ma M. Simulation of the transfer and fate of HCHs since the 1950s in Lanzhou, China. ECOTOXICOLOGY AND ENVIRONMENTAL SAFETY 2009; 72:1950-1956. [PMID: 19477008 DOI: 10.1016/j.ecoenv.2009.04.009] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/26/2008] [Revised: 03/31/2009] [Accepted: 04/04/2009] [Indexed: 05/27/2023]
Abstract
A level IV fugacity model is described and illustrated by application to the fate of alpha-, beta-, gamma-, and delta-hexachlorocyclohexane (HCH) in the Lanzhou area over a 60-year period from their introduction into the agricultural field until 2019. The established model is successfully applied to simulate the transfer processes and the concentration distribution of HCHs under non-steady-state assumptions in four environmental compartments in the Lanzhou area: soil, air, water, and sediment. Furthermore, the calculated results agree well with monitoring data from the literature in the same period of time. We assume that 40% of the total use of HCHs isomers enters into the air and 60% enters the soil. The results indicate that the main source of HCHs in the area is agricultural applications; the biggest bulk sink is soil (accounting for 99.6% of total amount in the environment). Among all the transfer processes, the deposition and the diffusion at the air-soil and air-water interfaces are the primary processes, and degradation in soil and air is the key process of HCH disappearance.
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Affiliation(s)
- Jiyuan Dong
- Key Laboratory of Western China's Environmental Systems, Ministry of Education, Lanzhou University, Lanzhou 730000, China
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15
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Spink BC, Bennett JA, Pentecost BT, Lostritto N, Englert NA, Benn GK, Goodenough AK, Turesky RJ, Spink DC. Long-term estrogen exposure promotes carcinogen bioactivation, induces persistent changes in gene expression, and enhances the tumorigenicity of MCF-7 human breast cancer cells. Toxicol Appl Pharmacol 2009; 240:355-66. [PMID: 19619570 DOI: 10.1016/j.taap.2009.07.013] [Citation(s) in RCA: 26] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/21/2009] [Revised: 07/14/2009] [Accepted: 07/15/2009] [Indexed: 12/21/2022]
Abstract
The cumulative exposure to estrogens is an important determinant in the risk of breast cancer, yet the full range of mechanisms involving estrogens in the genesis and progression of breast cancer remains a subject of debate. Interactions of estrogens and environmental toxicants have received attention as putative factors contributing to carcinogenesis. Mechanistic studies have demonstrated interactions between estrogen receptor alpha (ERalpha) and the aryl hydrocarbon receptor (AhR), with consequences on the genes that they regulate. Many studies of ERalpha and AhR-mediated effects and crosstalk between them have focused on the initial molecular events. In this study, we investigated ERalpha- and AhR-mediated effects in long-term estrogen exposed (LTEE) MCF-7 human breast cancer cells, which were obtained by continuous culturing for at least 12 weeks in medium supplemented with 1 nM of 17beta-estradiol (E(2)). With these LTEE cells and with parallel control cells cultured without E(2) supplementation, we performed an extensive study of cytochrome P450 (CYP) induction, carcinogen bioactivation, global gene expression, and tumorigenicity in immunocompromised mice. We found that LTEE cells, in comparison with control cells, had higher levels of AhR mRNA and protein, greater responsiveness for AhR-regulated CYP1A1 and CYP1B1 induction, a 6-fold higher initial level of benzo(a)pyrene-DNA adducts as determined by liquid chromatography tandem mass spectrometry, marked differences in the expression of numerous genes, and a higher rate of E(2)-dependent tumor growth as xenografts. These studies indicate that LTEE causes adaptive responses in MCF-7 cells, which may reflect processes that contribute to the overall carcinogenic effect of E(2).
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Affiliation(s)
- Barbara C Spink
- Laboratory of Molecular Toxicology, Wadsworth Center, New York State Department of Health, Albany, NY 12201-0509, USA.
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16
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Wong PS, Li W, Vogel CF, Matsumura F. Characterization of MCF mammary epithelial cells overexpressing the Arylhydrocarbon receptor (AhR). BMC Cancer 2009; 9:234. [PMID: 19604390 PMCID: PMC2721847 DOI: 10.1186/1471-2407-9-234] [Citation(s) in RCA: 28] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/19/2008] [Accepted: 07/15/2009] [Indexed: 11/13/2022] Open
Abstract
Background Recent reports indicate the existence of breast cancer cells expressing very high levels of the Arylhydrocarbon receptor (AhR), a ubiquitous intracellular receptor best known for mediating toxic action of dioxin and related pollutants. Positive correlation between the degree of AhR overexpression and states of increasing transformation of mammary epithelial cells appears to occur in the absence of any exogenous AhR ligands. These observations have raised many questions such as why and how AhR is overexpressed in breast cancer and its physiological roles in the progression to advanced carcinogenic transformation. To address those questions, we hypothesized that AhR overexpression occurs in cells experiencing deficiencies in normally required estrogen receptor (ER) signaling, and the basic role of AhR in such cases is to guide the affected cells to develop orchestrated cellular changes aimed at substituting the normal functions of ER. At the same time, the AhR serves as the mediator of the cell survival program in the absence of ER signaling. Methods We subjected two lines of Michigan Cancer Foundation (MCF) mammary epithelial cells to 3 different types ER interacting agents for a number of passages and followed the changes in the expression of AhR mRNA. The resulting sublines were analyzed for phenotypical changes and unique molecular characteristics. Results MCF10AT1 cells continuously exposed to 17-beta-estradiol (E2) developed sub-lines that show AhR overexpression with the characteristic phenotype of increased proliferation, and distinct resistance to apoptosis. When these chemically selected cell lines were treated with a specific AhR antagonist, 3-methoxy-4-nitroflavone (MNF), both of the above abnormal cellular characteristics disappeared, indicating the pivotal role of AhR in expressing those cellular phenotypes. The most prominent molecular characteristics of these AhR overexpressing MCF cells were found to be overexpression of ErbB2 and COX-2. Furthermore, we could demonstrate that suppression of AhR functions through anti-AhR siRNA or MNF causes the recovery of ERalpha functions. Conclusion One of the main causes for AhR overexpression in these MCF breast cancer cells appears to be the loss of ERalpha functions. This phenomenon is likely to be based on the mutually antagonistic relationship between ER and AhR.
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Affiliation(s)
- Patrick S Wong
- Department of Environmental Toxicology and the Center for Environmental Health Sciences, University of California, One Shields Ave., Davis, CA 95616, USA.
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Zhang H, Yang C, Zhao Q, Qiao C. Development of an autofluorescent organophosphates-degrading Stenotrophomonas sp. with dehalogenase activity for the biodegradation of hexachlorocyclohexane (HCH). BIORESOURCE TECHNOLOGY 2009; 100:3199-3204. [PMID: 19269809 DOI: 10.1016/j.biortech.2009.02.008] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/19/2008] [Revised: 02/04/2009] [Accepted: 02/04/2009] [Indexed: 05/27/2023]
Abstract
Simultaneous biodegradation of hexachlorocyclohexane (HCH) and organophosphates (OPs) by a recombinant Stenotrophomonas sp. was studied in the study. The broad-host-range plasmid pVGAB, harboring enhanced green fluorescent protein gene (egfp) and dehalogenase genes (linA and linB), was constructed and transformed into the OP-degrading strain Stenotrophomonas YC-1 to get the recombinant strain YC-H. Over-expression of dehalogenase (LinA and LinB) and enhanced green fluorescent protein (EGFP) was obtained in YC-H by determining their enzymatic activities and fluorescence intensity. YC-H was capable of rapidly and simultaneously degrading 10mg/l gamma-HCH and 100mg/l methyl parathion (MP) determined by GC-ECD analysis. A bioremediation assay with YC-H inoculated into fumigated and nonfumigated soil showed that both 10mg/kg gamma-HCH and 100mg/kg MP could be completely degraded within 32 days. The novel EGFP-marked bacterium could be potentially applied in the field-scale decontamination of HCH and OPs residues in the environment.
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Affiliation(s)
- Heng Zhang
- State Key Laboratory of Integrated Management of Pest Insects and Rodents, Institute of Zoology, Chinese Academy of Sciences, Beijing, China
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19
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Alvarez-Pedrerol M, Ribas-Fitó N, Torrent M, Carrizo D, Garcia-Esteban R, Grimalt JO, Sunyer J. Thyroid disruption at birth due to prenatal exposure to beta-hexachlorocyclohexane. ENVIRONMENT INTERNATIONAL 2008; 34:737-740. [PMID: 18207242 DOI: 10.1016/j.envint.2007.12.001] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/14/2007] [Revised: 12/04/2007] [Accepted: 12/05/2007] [Indexed: 05/25/2023]
Abstract
OBJECTIVE Thyroid hormones play an important role in human brain development, and some organochlorine compounds (OCs) act as thyroid disruptors. The objective of the present study was to evaluate the association between prenatal exposure to organochlorine compounds and thyroid function in newborns from a general population birth cohort in Menorca, with an a-priori specific focus on beta-HCH. METHODS Levels of polychlorinated biphenyls (PCB congeners 28, 52, 101, 118, 138, 153 and 180), hexachlorobenzene (HCB), beta-hexachlorocyclohexane (beta-HCH), dichlorodiphenyl dichloroethylene (p'p'-DDE) and dichlorodiphenyl trichloroethane (p'p-DDT) in cord serum, and thyrotropin (TSH) concentration in plasma three days after birth were measured in 387 newborns from Menorca. The TSH concentration was categorized (high or low), except for 27 children whose TSH levels were quantified. RESULTS Levels of beta-HCH and PCB-153 were positively related to TSH concentrations (gestational age-adjusted coefficient (p-value): 0.26 (p = 0.006) and 0.31 (p = 0.050), respectively). CONCLUSIONS beta-HCH is potentially a new thyroid disrupting compound, deserving special interest in future studies given its high body burden in humans.
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Wang DC, Yu P, Zhang Y, Cui Y, Sun CH. The determination of persistent organic pollutants (POPs) in the colostrums of women in preterm labor. Clin Chim Acta 2008; 397:18-21. [PMID: 18694742 DOI: 10.1016/j.cca.2008.07.004] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/22/2008] [Revised: 06/19/2008] [Accepted: 07/07/2008] [Indexed: 11/28/2022]
Abstract
BACKGROUND Human milk not only contains nutrients and antibodies, but also can be used as an indicator for levels of organic pollutants in human bodies. We developed a method for determining persistent organic pollutants (POPs) in the colostrum of women in preterm labor, the POPs of 36 colostrum samples have been examined. METHODS Thirty-six samples of colostrum from preterm women were extracted by acetone-acetonitrile, enriched and purified by solid-phase Florisil columns. The purified POPs were further separated by the capillary columns, and detected by the gas chromatography-electron capture detection (GC-ECD). RESULTS The average recovery rates of 6 types of organochlorine-based pesticides were 80.2%-112.1%, which represent the first 3 categories of the 12 species of POPs. The precise quantities detected were 3.85%-9.32% (the limits of detection were 0.03 microg/l to 0.08 microg/l), and the linear correlation coefficients were >or=0.9969. Of the 36 women tested, 10 (27.8%) were found to have colostrums containing traces of dichloro-diphenyl-trichloroethane (DDT), and 2 (5.56%) were tested positive for dieldrin. CONCLUSIONS The combination of using GC-ECD proved to be both accurate and reliable, and this process proved to be both simple and time-effective. This method is applicable for determining the levels of POPs in organisms.
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Affiliation(s)
- De-Cai Wang
- Public Health College, Harbin Medical University, Harbin, People's Republic of China
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21
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Lifestyle-related factors and environmental agents causing cancer: an overview. Biomed Pharmacother 2007; 61:640-58. [PMID: 18055160 DOI: 10.1016/j.biopha.2007.10.006] [Citation(s) in RCA: 159] [Impact Index Per Article: 9.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/04/2007] [Accepted: 10/10/2007] [Indexed: 02/09/2023] Open
Abstract
The increasing incidence of a variety of cancers after the Second World War confronts scientists with the question of their origin. In Western countries, expansion and ageing of the population as well as progress in cancer detection using new diagnostic and screening tests cannot fully account for the observed growing incidence of cancer. Our hypothesis is that environmental factors play a more important role in cancer genesis than it is usually agreed. (1) Over the last 2-3 decades, alcohol consumption and tobacco smoking in men have significantly decreased in Western Europe and North America. (2) Obesity is increasing in many countries, but the growing incidence of cancer also concerns cancers not related to obesity nor to other known lifestyle-related factors. (3) There is evidence that the environment has changed over the time period preceding the recent rise in cancer incidence, and that this change, still continuing, included the accumulation of many new carcinogenic factors in the environment. (4) Genetic susceptibility to cancer due to genetic polymorphism cannot have changed over one generation and actually favours the role of exogenous factors through gene-environment interactions. (5) Age is not the unique factor to be considered since the rising incidence of cancers is seen across all age categories, including children, and adolescents. (6) The fetus is specifically vulnerable to exogenous factors. A fetal exposure during a critical time window may explain why current epidemiological studies may still be negative in adults. We therefore propose that the involuntary exposure to many carcinogens in the environment, including microorganisms (viruses, bacteria and parasites), radiations (radioactivity, UV and pulsed electromagnetic fields) and many xenochemicals, may account for the recent growing incidence of cancer and therefore that the risk attributable to environmental carcinogen may be far higher than it is usually agreed. Of major concern are: outdoor air pollution by carbon particles associated with polycyclic aromatic hydrocarbons; indoor air pollution by environmental tobacco smoke, formaldehyde and volatile organic compounds such as benzene and 1,3 butadiene, which may particularly affect children and food contamination by food additives and by carcinogenic contaminants such as nitrates, pesticides, dioxins and other organochlorines. In addition, carcinogenic metals and metalloids, pharmaceutical medicines and some ingredients and contaminants in cosmetics may be involved. Although the risk fraction attributable to environmental factors is still unknown, this long list of carcinogenic and especially mutagenic factors supports our working hypothesis according to which numerous cancers may in fact be caused by the recent modification of our environment.
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Pierik FH, Klebanoff MA, Brock JW, Longnecker MP. Maternal pregnancy serum level of heptachlor epoxide, hexachlorobenzene, and beta-hexachlorocyclohexane and risk of cryptorchidism in offspring. ENVIRONMENTAL RESEARCH 2007; 105:364-9. [PMID: 17532317 PMCID: PMC2077301 DOI: 10.1016/j.envres.2007.04.005] [Citation(s) in RCA: 28] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/27/2006] [Revised: 04/11/2007] [Accepted: 04/16/2007] [Indexed: 05/08/2023]
Abstract
Prenatal exposure to environmental endocrine disrupters has been postulated to cause adverse effects on male reproductive health. Exposure to organochlorine pesticides with anti-androgenic and estrogenic potency has been shown to interfere with the sex-hormone-dependent process of testicular descent in animal models. We examined the relation between serum levels of the pesticides heptachlor epoxide (HCE), hexachlorobenzene (HCB), and beta-hexachlorocyclohexane (beta-HCCH) in pregnant women, and the occurrence of cryptorchidism in their sons. These three pesticides were previously suggested as risk factors for cryptorchidism. In a nested case-control design, we compared serum levels between mothers of cases (n = 219) and controls (n = 564), selected from the Collaborative Perinatal Project, a US birth cohort study of pregnancies in 1959-1966. The offspring of mothers with HCE levels above the 90th percentile compared to those below the 10th percentile had an adjusted odds ratio of cryptorchidism of 1.2 (95% confidence interval 0.6-2.6); for beta-HCCH the odds ratio was 1.6 (0.7-3.6). For HCB the adjusted odds ratio was near one. These results provide little support for an association of cryptorchidism with exposure to low levels of HCE or HCB. For beta-HCCH the findings were somewhat suggestive of an association but were inconclusive.
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Affiliation(s)
- Frank H Pierik
- Department of Reproduction and Perinatology, TNO Quality of Life, Leiden, The Netherlands.
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Belpomme D, Irigaray P, Hardell L, Clapp R, Montagnier L, Epstein S, Sasco AJ. The multitude and diversity of environmental carcinogens. ENVIRONMENTAL RESEARCH 2007; 105:414-29. [PMID: 17692309 DOI: 10.1016/j.envres.2007.07.002] [Citation(s) in RCA: 137] [Impact Index Per Article: 8.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/04/2007] [Revised: 06/25/2007] [Accepted: 07/05/2007] [Indexed: 05/16/2023]
Abstract
We have recently proposed that lifestyle-related factors, screening and aging cannot fully account for the present overall growing incidence of cancer. In order to propose the concept that in addition to lifestyle related factors, exogenous environmental factors may play a more important role in carcinogenesis than it is expected, and may therefore account for the growing incidence of cancer, we overview herein environmental factors, rated as certainly or potentially carcinogenic by the International Agency for Research on Cancer (IARC). We thus analyze the carcinogenic effect of microorganisms (including viruses), radiations (including radioactivity, UV and pulsed electromagnetic fields) and xenochemicals. Chemicals related to environmental pollution appear to be of critical importance, since they can induce occupational cancers as well as other cancers. Of major concerns are: outdoor air pollution by carbon particles associated with polycyclic aromatic hydrocarbons; indoor air pollution by environmental tobacco smoke, formaldehyde and volatile organic compounds such as benzene and 1,3 butadiene, which may particularly affect children, and food pollution by food additives and by carcinogenic contaminants such as nitrates, pesticides, dioxins and other organochlorines. In addition, carcinogenic metals and metalloids, pharmaceutical medicines and cosmetics may be involved. Although the risk fraction attributable to environmental factors is still unknown, this long list of carcinogenic and especially mutagenic factors supports our working hypothesis according to which numerous cancers may in fact be caused by the recent modification of our environment.
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Affiliation(s)
- D Belpomme
- Department of Medical Oncology, European Hospital Georges Pompidou (HEGP), University of Paris, F-75015Paris, France.
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24
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Wong PS, Matsumura F. Promotion of breast cancer by beta-hexachlorocyclohexane in MCF10AT1 cells and MMTV-neu mice. BMC Cancer 2007; 7:130. [PMID: 17640349 PMCID: PMC2096743 DOI: 10.1186/1471-2407-7-130] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/08/2007] [Accepted: 07/17/2007] [Indexed: 11/16/2022] Open
Abstract
Background Exposure to β-Hexachlorocyclohexane (β-HCH), a contaminant of the hexachlorohexane pesticide lindane, has been implicated as a risk factor in the development of breast cancers in epidemiological studies. Previous studies in our laboratory have demonstrated the ability of β-HCH to elicit its actions via a ligand-independent activation of the estrogen receptor through increased c-Neu (= erbB2 or HER-2) expression and kinase activation in both the BG-1 and MCF-7 cell lines. In addition, long term exposure (33 passages) to β-HCH was shown to promote the selection of MCF-7 cells which exhibit a more metastatic phenotype. Methods In this current study, we decided to investigate the long-term effects of β-HCH in both the MCF10AT1 cell line which was derived from a normal epithelial cell line by stably transfecting a mutated c-Ha-ras and a MMTV-Neu mouse model for mammary cancer in vivo. MCF10AT1 cells were exposed for 20 passages with β-HCH, 4-OH-Tamoxifen (Tam), or 17-β-estradiol (E2) after which cells were analyzed for proliferation rates and mRNA expression by RT-PCR. In our in vivo studies, MMTV-Neu mice were injected with β-HCH and observed for tumor formation over a 70 week period. Results β-HCH and Tam selected MCF10AT1 cells demonstrated increased mRNA expression of MMP-13 (collagenase-3) a marker of increased invasiveness. β-HCH treatment was also seen to increase the expression in a number of proto-oncogenes (c-Neu, Cyclin D1, p27), cell status markers (Met-1, CK19), and the inflammatory marker NFκB. Previous studies, have demonstrated the role of these markers as evidence of malignant transformations, and further illustrate the ability of β-HCH to be carcinogenic. To demonstrate β-HCH's tumorigenic properties in an in vivo system, we used an MMTV-Neu mouse model. MMTV-Neu is a c-Neu overexpressing strain which has been shown to spontaneously develop mammary tumors at later stages of aging. In this experiment, β-HCH exposure was shown to both accelerate the appearance (~8 weeks for median tumor-free period) and incidence (~25% increase at the end of the test period) of tumors when compared to control mice receiving only the corn-oil vehicle. Conclusion Based upon these results, it was concluded that β-HCH does act as a breast cancer promoter which exerts its tumorigenic activity via increased c-Neu expression.
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MESH Headings
- Animals
- Carcinogens/administration & dosage
- Cell Line, Tumor
- Female
- Hexachlorocyclohexane/administration & dosage
- Humans
- Mammary Neoplasms, Experimental/chemically induced
- Mammary Neoplasms, Experimental/genetics
- Mammary Neoplasms, Experimental/metabolism
- Mammary Neoplasms, Experimental/pathology
- Mammary Tumor Virus, Mouse/genetics
- Mice
- Mice, Transgenic
- Receptor, ErbB-2/biosynthesis
- Receptor, ErbB-2/genetics
- Receptor, ErbB-2/physiology
- Transfection
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Affiliation(s)
- Patrick S Wong
- Center for Health and the Environment-John Muir Institute of the Environment, Department of Environmental Toxicology. University of California, Davis, CA 95616, USA
| | - Fumio Matsumura
- Center for Health and the Environment-John Muir Institute of the Environment, Department of Environmental Toxicology. University of California, Davis, CA 95616, USA
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25
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Raina V, Suar M, Singh A, Prakash O, Dadhwal M, Gupta SK, Dogra C, Lawlor K, Lal S, van der Meer JR, Holliger C, Lal R. Enhanced biodegradation of hexachlorocyclohexane (HCH) in contaminated soils via inoculation with Sphingobium indicum B90A. Biodegradation 2007; 19:27-40. [PMID: 17387620 DOI: 10.1007/s10532-007-9112-z] [Citation(s) in RCA: 64] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/19/2006] [Accepted: 02/28/2007] [Indexed: 11/30/2022]
Abstract
Soil pollution with hexachlorocyclohexane (HCH) has caused serious environmental problems. Here we describe the targeted degradation of all HCH isomers by applying the aerobic bacterium Sphingobium indicum B90A. In particular, we examined possibilities for large-scale cultivation of strain B90A, tested immobilization, storage and inoculation procedures, and determined the survival and HCH-degradation activity of inoculated cells in soil. Optimal growth of strain B90A was achieved in glucose-containing mineral medium and up to 65% culturability could be maintained after 60 days storage at 30 degrees C by mixing cells with sterile dry corncob powder. B90A biomass produced in water supplemented with sugarcane molasses and immobilized on corncob powder retained 15-20% culturability after 30 days storage at 30 degrees C, whereas full culturability was maintained when cells were stored frozen at -20 degrees C. On the contrary, cells stored on corncob degraded gamma-HCH faster than those that had been stored frozen, with between 15 and 85% of gamma-HCH disappearance in microcosms within 20 h at 30 degrees C. Soil microcosm tests at 25 degrees C confirmed complete mineralization of [(14)C]-gamma-HCH by corncob-immobilized strain B90A. Experiments conducted in small pits and at an HCH-contaminated agricultural site resulted in between 85 and 95% HCH degradation by strain B90A applied via corncob, depending on the type of HCH isomer and even at residual HCH concentrations. Up to 20% of the inoculated B90A cells survived under field conditions after 8 days and could be traced among other soil microorganisms by a combination of natural antibiotic resistance properties, unique pigmentation and PCR amplification of the linA genes. Neither the addition of corncob nor of corncob immobilized B90A did measurably change the microbial community structure as determined by T-RFLP analysis. Overall, these results indicate that on-site aerobic bioremediation of HCH exploiting the biodegradation activity of S. indicum B90A cells stored on corncob powder is a promising technology.
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Affiliation(s)
- Vishakha Raina
- Department of Zoology, University of Delhi, Delhi 110007, India
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26
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Sharma P, Raina V, Kumari R, Malhotra S, Dogra C, Kumari H, Kohler HPE, Buser HR, Holliger C, Lal R. Haloalkane dehalogenase LinB is responsible for beta- and delta-hexachlorocyclohexane transformation in Sphingobium indicum B90A. Appl Environ Microbiol 2006; 72:5720-7. [PMID: 16957186 PMCID: PMC1563659 DOI: 10.1128/aem.00192-06] [Citation(s) in RCA: 70] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/25/2006] [Accepted: 06/02/2006] [Indexed: 11/20/2022] Open
Abstract
Incubation of resting cells of Sphingobium indicum B90A, Sphingobium japonicum UT26, and Sphingobium francense Sp+ showed that they were able to transform beta- and delta-hexachlorocyclohexane (beta- and delta-HCH, respectively), the most recalcitrant hexachlorocyclohexane isomers, to pentachlorocyclohexanols, but only resting cells of strain B90A could further transform the pentachlorocyclohexanol intermediates to the corresponding tetrachlorocyclohexanediols. Moreover, experiments with resting cells of Escherichia coli expressing the LinB proteins of strains B90A, UT26, and Sp+ indicated that LinB was responsible for these transformations. Purified LinB proteins from all three strains also effected the formation of the respective pentachlorocyclohexanols. Although the three LinB enzymes differ only marginally with respect to amino acid sequence, they showed interesting differences with respect to substrate specificity. When LinB from strain B90A was incubated with beta- and delta-HCH, the pentachlorocyclohexanol products were further transformed and eventually disappeared from the incubation mixtures. In contrast, the LinB proteins from strains UT26 and Sp+ could not catalyze transformation of the pentachlorocyclohexanols, and these products accumulated in the incubation mixture. A mutant of strain Sp+ lacking linA and linB did not degrade any of the HCH isomers, including beta-HCH, and complementation of this mutant by linB from strain B90A restored the ability to degrade beta- and delta-HCH.
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Affiliation(s)
- Poonam Sharma
- Department of Zoology, University of Delhi, Delhi 110007, India
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27
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Tao S, Yang Y, Cao HY, Liu WX, Coveney RM, Xu FL, Cao J, Li BG, Wang XJ, Hu JY, Fang JY. Modeling the dynamic changes in concentrations of gamma-hexachlorocyclohexane (gamma-HCH) in Tianjin region from 1953 to 2020. ENVIRONMENTAL POLLUTION (BARKING, ESSEX : 1987) 2006; 139:183-93. [PMID: 16087280 DOI: 10.1016/j.envpol.2004.12.013] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/14/2004] [Accepted: 12/13/2004] [Indexed: 05/03/2023]
Abstract
A level IV fugacity model was used to simulate the dynamic changes of gamma-hexachlorocyclohexane (gamma-HCH) concentrations in environmental media in Tianjin, China. A similar model (level III) was previously used and validated under steady state conditions; this paper explores its dynamic behavior. Application of the level IV fugacity model has been validated using independently observed gamma-HCH concentrations in various media during the early 1980s and during 2001. Sensitivity analysis was conducted using coefficient-of-variation normalized sensitivity coefficients. The model was also subject to uncertainty analysis using Monte Carlo simulation. It was found that concentrations of gamma-HCH reached within 95% of their steady-state levels in all media after less than 15 years. Around one order-of-magnitude decreases in gamma-HCH concentrations in various media occurred between 1993 and 2001. We project that gamma-HCH concentrations will decrease another 1.7-1.9 orders of magnitude to reach 1.1 (0.9-1.2) x 10(-14), 2.7 (2.5-3.0) x 10(-10), 1.2 (1.1-1.3) x 10(-7), and 6.1 (5.4-6.8) x 10(-8) mol/m(3), in air, water, soil, and sediment, respectively, by 2020. The sensitivities and true uncertainty of the model are discussed.
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Affiliation(s)
- S Tao
- Laboratory for Earth Surface Processes, College of Environmental Sciences, Peking University, Beijing 100871, China.
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Opinion of the Scientific Panel on contaminants in the food chain [CONTAM] related to gamma-HCH and other hexachlorocyclohexanes as undesirable substances in animal feed. EFSA J 2005. [DOI: 10.2903/j.efsa.2005.250] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022] Open
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Keshava C, Whipkey D, Weston A. Transcriptional signatures of environmentally relevant exposures in normal human mammary epithelial cells: benzo[a]pyrene. Cancer Lett 2005; 221:201-11. [PMID: 15808406 DOI: 10.1016/j.canlet.2004.08.037] [Citation(s) in RCA: 29] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/17/2004] [Revised: 08/18/2004] [Accepted: 08/19/2004] [Indexed: 01/12/2023]
Abstract
Changes in gene expression in a panel of primary normal human mammary epithelial cell strains, developed from healthy breast tissue obtained at reduction mammoplasty from different donors, in response to benzo[a]pyrene exposure have been investigated. It was expected that both gene expression changes common to cell strains derived from different donors as well as inter-individual variation would be observed. Therefore, the strategy that has been adopted is to identify potentially important changes, or useful changes from a biomonitoring perspective, using gene-array technology and a small number of donors; then investigate selected transcription responses using a large number of tissue donors and a cheaper method of transcript detection (real-time polymerase chain reaction). Here we report results from four primary normal human mammary epithelial cell strains that were treated with benzo[a]pyrene in vitro for either 6 or 24 h. Transcription was monitored using high-density oligonucleotide arrays (Affymetrix HuGeneFL). Total RNA was used for the preparation of labeled targets that were hybridized to microarrays containing probes representing more than 6800 human genes and expressed sequence tags. Gene expression data were analyzed using the GeneChip software (MAS 5.0). Altered gene expression patterns were observed in response to benzo[a]pyrene in human mammary epithelial cell strains from different donors. Specifically, the dioxin inducible cytochrome P450 CYP1B1 was consistently induced in response to 6 and 24 h exposure to benzo[a]pyrene in cell strains from all four donors. Two other genes that were relatively consistently induced were IL1beta and MMP1. Less consistent changes in other metabolism genes (CYP1A1, CYP11B2, and NQO1) and certain cell cycle control genes GOS2 and AF1Q were also induced, while EGR1 was suppressed. Although no change in p53 transcription was observed, an accumulation of p53 protein was detected using antibodies. A similar accumulation of Waf1 (p21) was also observed using immunohistochemistry, this was expected since p53 is p21's transcription factor. Significant inter-individual variations in both the levels and patterns of gene expression were observed, in response to benzo[a]pyrene exposure. These studies provide a complementary approach to molecular epidemiology for the investigation of differential susceptibility to chemical carcinogens, and specifically polycyclic aromatic hydrocarbons.
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Affiliation(s)
- Channa Keshava
- Heatlh Effects Laboratory Division, National Institute for Occupational Safety and Health-CDC, Centers for Disease Control and Prevention, DHHS, 1095 Willowdale Road, M/S L-3014, Morgantown, WV 26505-2888, USA
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30
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Ledirac N, Antherieu S, d'Uby AD, Caron JC, Rahmani R. Effects of Organochlorine Insecticides on MAP Kinase Pathways in Human HaCaT Keratinocytes: Key Role of Reactive Oxygen Species. Toxicol Sci 2005; 86:444-52. [PMID: 15888667 DOI: 10.1093/toxsci/kfi192] [Citation(s) in RCA: 44] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
Organochlorine pesticides (OCs) are reported as potential carcinogens in humans. The aim of this study was to investigate the effects of four OCs (dieldrin, endosulfan, heptachlor, and lindane) on mitogen-activated protein kinase (MAPK) cascades and more specifically to identify the mechanism underlying OC-induced ERK1/2 activation. Organochlorine pesticides increased phosphorylated Raf, MEK1/2, ERK1/2, and c-Jun in human HaCaT cells, but they had no effect on p38 MAPK activation. Moreover, blockade of Raf, MEK1/2, or PKC activation with geldanamycin, U0126, or calphostin C inhibited ERK1/2 phosphorylation, demonstrating a PKC-Raf-MEK1/2 pathway. We also showed that these insecticides induced the production of reactive oxygen species (ROS). Pre-treatment with the antioxidant molecule N-acetyl cysteine sharply decreased the level of phospho-ERK1/2 and had no effect on Raf and MEK1/2 activation, suggesting a Raf-independent mechanism. This study indicates that OCs strongly activate the ERK1/2 pathway, and it identifies a critical role of ROS in OC-induced ERK activation, probably by stabilizing its phosphorylation.
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Affiliation(s)
- Nathalie Ledirac
- Laboratoire de Toxicologie Cellulaire et Moléculaire, Centre de Recherche INRA, 400 route des Chappes, 06903 Sophia-Antipolis, France.
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