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Ma H, Wan JY, Cortessis VK, Gupta P, Cozen W. Survival in Agent Orange exposed and unexposed Vietnam-era veterans who were diagnosed with lymphoid malignancies. Blood Adv 2024; 8:1037-1041. [PMID: 38033199 PMCID: PMC10920100 DOI: 10.1182/bloodadvances.2023011999] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/23/2023] [Revised: 11/15/2023] [Accepted: 11/16/2023] [Indexed: 12/02/2023] Open
Affiliation(s)
- Helen Ma
- Section of Hematology/Oncology, Department of Medicine, VA Long Beach Healthcare System, Long Beach, CA
- Division of Hematology/Oncology, Department of Medicine, School of Medicine, University of California Irvine, Irvine, CA
| | - Jia Y. Wan
- Department of Epidemiology and Biostatistics, Samueli School of Public Health, University of California, Irvine, CA
| | - Victoria K. Cortessis
- Department of Clinical Population and Public Health Sciences, Keck School of Medicine, University of Southern California, Los Angeles, CA
| | - Pankaj Gupta
- Section of Hematology/Oncology, Department of Medicine, VA Long Beach Healthcare System, Long Beach, CA
| | - Wendy Cozen
- Division of Hematology/Oncology, Department of Medicine, School of Medicine, University of California Irvine, Irvine, CA
- Department of Epidemiology and Biostatistics, Samueli School of Public Health, University of California, Irvine, CA
- Department of Pathology, School of Medicine, University of California Irvine, Irvine, CA
- Department of Environmental and Occupational Health, Samueli School of Public Health, University of California Irvine, Irvine, CA
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2
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Nguyen ATN, Nishijo M, Pham TT, Tran NN, Tran AH, Hoang LV, Boda H, Morikawa Y, Nishino Y, Nishijo H. Sex-specific effects of perinatal dioxin exposure on eating behavior in 3-year-old Vietnamese children. BMC Pediatr 2018; 18:213. [PMID: 29976197 PMCID: PMC6034299 DOI: 10.1186/s12887-018-1171-2] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/01/2016] [Accepted: 06/11/2018] [Indexed: 02/11/2023] Open
Abstract
Background We previously reported that perinatal dioxin exposure increased autistic traits in children living in dioxin-contaminated areas of Vietnam. In the present study, we investigated the impact of dioxin exposure on children’s eating behavior, which is often altered in those with developmental disorders. Methods A total of 185 mother-and-child pairs previously enrolled in a birth cohort in dioxin-contaminated areas participated in this survey, conducted when the children reached 3 years of age. Perinatal dioxin exposure levels in the children were estimated using dioxin levels in maternal breast milk after birth. Mothers were interviewed using the Children’s Eating Behaviour Questionnaire (CEBQ). A multiple linear regression model was used to analyze the association between dioxin exposure and CEBQ scores, after controlling for covariates such as location, parity, maternal age, maternal education, maternal body mass index, family income, children’s gestational age at delivery, and children’s age at the time of the survey. A general linear model was used to analyze the effects of sex and dioxin exposure on CEBQ scores. Results There was no significant association between most dioxin congeners or toxic equivalencies of polychlorinated dibenzo-p-dioxins/furans (TEQ-PCDDs/Fs) and CEBQ scores in boys, although significant associations between some eating behavior sub-scores and 1,2,3,4,6,7,8,9-octachlorodibenzofuran were observed. In girls, there was a significant inverse association between levels of TEQ-PCDFs and enjoyment of food scores and between levels of TEQ-PCDFs and TEQ-PCDDs/Fs and desire to drink scores. Two pentachlorodibenzofuran congeners and 1,2,3,6,7,8-hexachlorodibenzofuran were associated with a decreased enjoyment of food score, and seven PCDF congeners were associated with a decreased desire to drink score. The adjusted mean enjoyment of food score was significantly lower in children of both sexes exposed to high levels of TEQ-PCDFs. There was, however, a significant interaction between sex and TEQ-PCDF exposure in their effect on desire to drink scores, especially in girls. Conclusions Perinatal exposure to dioxin can influence eating behavior in children and particularly in girls. A longer follow-up study would be required to assess whether emotional development that affects eating styles and behaviors is related to dioxin exposure. Electronic supplementary material The online version of this article (10.1186/s12887-018-1171-2) contains supplementary material, which is available to authorized users.
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Affiliation(s)
- Anh Thi Nguyet Nguyen
- Department of Public Health and Epidemiology, Kanazawa Medical University, 1-1, Daigaku, Uchinada, Ishikawa, 920-0293, Japan
| | - Muneko Nishijo
- Department of Public Health and Epidemiology, Kanazawa Medical University, 1-1, Daigaku, Uchinada, Ishikawa, 920-0293, Japan.
| | - Tai The Pham
- Biomedical and Pharmaceutical Research Center, Vietnam Military Medical University, Ha Noi, Vietnam
| | - Nghi Ngoc Tran
- Department of Public Health and Epidemiology, Kanazawa Medical University, 1-1, Daigaku, Uchinada, Ishikawa, 920-0293, Japan
| | - Anh Hai Tran
- Biomedical and Pharmaceutical Research Center, Vietnam Military Medical University, Ha Noi, Vietnam
| | - Luong Van Hoang
- Biomedical and Pharmaceutical Research Center, Vietnam Military Medical University, Ha Noi, Vietnam
| | - Hitomi Boda
- School of Nursing, Kanazawa Medical University, 1-1 Daigaku, Uchinada, Ishikawa, 920-0293, Japan
| | - Yuko Morikawa
- School of Nursing, Kanazawa Medical University, 1-1 Daigaku, Uchinada, Ishikawa, 920-0293, Japan
| | - Yoshikazu Nishino
- Department of Public Health and Epidemiology, Kanazawa Medical University, 1-1, Daigaku, Uchinada, Ishikawa, 920-0293, Japan
| | - Hisao Nishijo
- System Emotional Science, Graduate School of Medicine and Pharmaceutical Sciences, University of Toyama, 2630 Sugitani, Toyama, 930-0194, Japan
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3
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Rainey NE, Saric A, Leberre A, Dewailly E, Slomianny C, Vial G, Zeliger HI, Petit PX. Synergistic cellular effects including mitochondrial destabilization, autophagy and apoptosis following low-level exposure to a mixture of lipophilic persistent organic pollutants. Sci Rep 2017; 7:4728. [PMID: 28680151 PMCID: PMC5498599 DOI: 10.1038/s41598-017-04654-0] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/13/2016] [Accepted: 05/25/2017] [Indexed: 12/13/2022] Open
Abstract
Humans are exposed to multiple exogenous environmental pollutants. Many of these compounds are parts of mixtures that can exacerbate harmful effects of the individual mixture components. 2,3,7,8-tetrachlorodibenzo-p-dioxin (TCDD), is primarily produced via industrial processes including incineration and the manufacture of herbicides. Both endosulfan and TCDD are persistent organic pollutants which elicit cytotoxic effects by inducing reactive oxygen species generation. Sublethal concentrations of mixtures of TCDD and endosulfan increase oxidative stress, as well as mitochondrial homeostasis disruption, which is preceded by a calcium rise and, in fine, induce cell death. TCDD+Endosulfan elicit a complex signaling sequence involving reticulum endoplasmic destalilization which leads to Ca2+ rise, superoxide anion production, ATP drop and late NADP(H) depletion associated with a mitochondrial induced apoptosis concomitant early autophagic processes. The ROS scavenger, N-acetyl-cysteine, blocks both the mixture-induced autophagy and death. Calcium chelators act similarly and mitochondrially targeted anti-oxidants also abrogate these effects. Inhibition of the autophagic fluxes with 3-methyladenine, increases mixture-induced cell death. These findings show that subchronic doses of pollutants may act synergistically. They also reveal that the onset of autophagy might serve as a protective mechanism against ROS-triggered cytotoxic effects of a cocktail of pollutants in Caco-2 cells and increase their tumorigenicity.
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Affiliation(s)
- Nathan E Rainey
- Laboratoire de Toxicologie, Pharmacologie et Signalisation Cellulaire, INSERM S-1124, Université Paris-Descartes, Centre Universitaire des Saints-Pères, 45 Rue des Saints-Pères, F-75270, Paris, Cedex 06, France
- Laboratory for Vascular Translational Science (LVTS), INSERM U1148, X. Bichat Hospital, Université Paris 13, UFR SMBH Sorbonne Paris Cité, 75018, Paris, France
| | - Ana Saric
- Laboratoire de Toxicologie, Pharmacologie et Signalisation Cellulaire, INSERM S-1124, Université Paris-Descartes, Centre Universitaire des Saints-Pères, 45 Rue des Saints-Pères, F-75270, Paris, Cedex 06, France
- Division of Molecular Medicine, Rudger Boskovic Institute, Zagreb, Croatia
| | - Alexandre Leberre
- Laboratoire de Toxicologie, Pharmacologie et Signalisation Cellulaire, INSERM S-1124, Université Paris-Descartes, Centre Universitaire des Saints-Pères, 45 Rue des Saints-Pères, F-75270, Paris, Cedex 06, France
| | - Etienne Dewailly
- Laboratoire de Physiologie cellulaire, INSERM U800, Université des Sciences et Techniques de Lille 1, F-59655, Villeneuve d'Ascq, Cedex, France
| | - Christian Slomianny
- Laboratoire de Physiologie cellulaire, INSERM U800, Université des Sciences et Techniques de Lille 1, F-59655, Villeneuve d'Ascq, Cedex, France
| | - Guillaume Vial
- Unité 1060 INSERM CarMen/Univ.Lyon1/INRA 1235, INSA, Bât. IMBL, La Doua 11 Avenue Jean Capelle, 69100, Villeurbanne, France
| | - Harold I Zeliger
- Zeliger Chemical, Toxicological and Environmental Research, 41 Wildwood Drive, Cape Elizabeth, Maine, 04107, USA
| | - Patrice X Petit
- Laboratoire de Toxicologie, Pharmacologie et Signalisation Cellulaire, INSERM S-1124, Université Paris-Descartes, Centre Universitaire des Saints-Pères, 45 Rue des Saints-Pères, F-75270, Paris, Cedex 06, France.
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4
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Han M, Liu X, Liu S, Su G, Fan X, Chen J, Yuan Q, Xu G. 2,3,7,8-Tetrachlorodibenzo-p-dioxin (TCDD) induces hepatic stellate cell (HSC) activation and liver fibrosis in C57BL6 mouse via activating Akt and NF-κB signaling pathways. Toxicol Lett 2017; 273:10-19. [PMID: 28302560 DOI: 10.1016/j.toxlet.2017.03.013] [Citation(s) in RCA: 23] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/13/2017] [Revised: 03/09/2017] [Accepted: 03/10/2017] [Indexed: 01/18/2023]
Abstract
2,3,7,8-tetrachlorodibenzo-p-dioxin (TCDD) is a widespread environmental pollutant that could induce serious toxic effects in both humans and rodents. Some studies suggested that TCDD exposure may facilitate the activation of hepatic stellate cells (HSCs) and liver injury. However, the underlying molecular mechanism by which environmental pollutants promote liver injury remains poorly understood. In the present study, we established an animal model of TCDD exposure by intraperitoneal injection of TCDD in male C57BL/6J mice. As revealed by Sirius red staining and hematoxylin-eosin (H&E) staining evaluation, we found that TCDD-exposed mice showed extensive disruption of liver architecture, including hepatocellular necrosis, inflammatory cell infiltration, and fibrosis. Furthermore, we showed that TCDD up-regulated the expression and secretion of the pro-inflammatory cytokines tumor necrosis factor-alpha (TNF-α) and interleukin-6 (IL-6) in a dose-dependent manner in cultured HSCs. The effects of TCDD on cytokine secretion were very likely mediated by protein kinase B/Akt and Nuclear Factor kappa B (NF-κB) pathways, as indicated by the fact that TCDD markedly increased Akt phosphorylation and nuclear translocation of NF-κB p65 in HSCs. Furthermore, LY294002, an Akt inhibitor, significantly attenuated TCDD-triggered HSC activation through blocking Akt phosphorylation and NF-κB activation. These results indicate that HSCs are susceptible to the cytotoxic effects of TCDD and chronic TCDD exposure may contribute to liver fibrosis by activating HSC Akt and NF-κB signaling pathways.
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Affiliation(s)
- Ming Han
- Department of Nutrition and Food Hygiene, School of Public Health, Nantong University, Nantong 226001, Jiangsu, PR China; Chuzhou Center for Disease Control and Prevention, Chuzhou, 239499 Anhui, PR China
| | - Xipeng Liu
- Department of Nutrition and Food Hygiene, School of Public Health, Nantong University, Nantong 226001, Jiangsu, PR China; Shanghai Ninth People's Hospital, Shanghai Jiaotong University School of Medicine, Huangpu, 200011 Shanghai, PR China
| | - Suyi Liu
- Department of Nutrition and Food Hygiene, School of Public Health, Nantong University, Nantong 226001, Jiangsu, PR China
| | - Guanglei Su
- Department of Nutrition and Food Hygiene, School of Public Health, Nantong University, Nantong 226001, Jiangsu, PR China
| | - Xikang Fan
- Department of Nutrition and Food Hygiene, School of Public Health, Nantong University, Nantong 226001, Jiangsu, PR China
| | - Jie Chen
- Department of Nutrition and Food Hygiene, School of Public Health, Nantong University, Nantong 226001, Jiangsu, PR China
| | - Qianting Yuan
- Department of Nutrition and Food Hygiene, School of Public Health, Nantong University, Nantong 226001, Jiangsu, PR China
| | - Guangfei Xu
- Department of Nutrition and Food Hygiene, School of Public Health, Nantong University, Nantong 226001, Jiangsu, PR China.
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5
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Herbicide Exposure, Vietnam Service, and Hypertension Risk in Army Chemical Corps Veterans. J Occup Environ Med 2016; 58:1127-1136. [DOI: 10.1097/jom.0000000000000876] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/06/2023]
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6
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Boffetta P, Scialli AR. TCDD and birth weight of Vietnamese infants. ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH INTERNATIONAL 2016; 23:17857-17858. [PMID: 27344653 DOI: 10.1007/s11356-016-7106-2] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/09/2016] [Accepted: 06/16/2016] [Indexed: 06/06/2023]
Affiliation(s)
- Paolo Boffetta
- Tisch Cancer Institute, Icahn School of Medicine at Mount Sinai, New York, NY, USA
| | - Anthony R Scialli
- Scialli Consulting LLC, 1050 30th St NW, Washington DC, 20007, USA.
- Departments of Obstetrics and Gynecology and of Pharmacology and Physiology, Georgetown University School of Medicine, Washington DC, USA.
- Department of Obstetrics and Gynecology, George Washington University School of Medicine and Health Sciences, Washington DC, USA.
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7
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Scialli AR, Watkins DK, Ginevan ME. Agent Orange Exposure and 2,3,7,8-Tetrachlorodibenzo-p-Dioxin (TCDD) in Human Milk. ACTA ACUST UNITED AC 2015. [DOI: 10.1002/bdrb.21145] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
- Anthony R. Scialli
- Scialli Consulting LLC; Washington District of Columbia
- Department of Obstetrics and Gynecology; Georgetown University School of Medicine; Washington District of Columbia
- Department of Pharmacology and Physiology; Georgetown University School of Medicine; Washington District of Columbia
- Department of Obstetrics and Gynecology; George Washington University School of Medicine and Health Sciences; Washington District of Columbia
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8
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Nghi TN, Nishijo M, Manh HD, Tai PT, Van Luong H, Anh TH, Thao PN, Trung NV, Waseda T, Nakagawa H, Kido T, Nishijo H. Dioxins and Nonortho PCBs in Breast Milk of Vietnamese Mothers Living in the Largest Hot Spot of Dioxin Contamination. ENVIRONMENTAL SCIENCE & TECHNOLOGY 2015; 49:5732-42. [PMID: 25798921 DOI: 10.1021/es506211p] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/09/2023]
Abstract
Bien Hoa Air Base is the largest dioxin contamination hot spot in Vietnam. In 2012, we recruited 216 mothers who were living in 10 communities around Bien Hoa Air Base and had delivered newborns at a prefecture hospital, and we investigated recent exposure levels of dioxins and nonortho PCBs in their breast milk. 2,3,7,8-Tetrachlorodibenzo-p-dioxin (2,3,7,8-tetraCDD) was present at 2.6 pg/g lipid in primiparae and 2.2 pg/g lipid in multiparae. Among multiparae and total subjects, significant high prevalence of 2,3,7,8-tetraCDD≥5 pg/g lipid and 2,3,7,8-tetraCDD contribution≥40% were observed in mothers living in the five communities closest to Bien Hoa Air Base. The TEQ for nonortho PCBs was 1.6 pg-TEQ/g lipid for primiparae, and this was even lower than that in the unsprayed area. The length of residency was a strong factor to increase dioxins, including 2,3,7,8-tetraCDD. Residency in the five communities with the highest exposure was a specific risk factor for increased 2,3,7,8-tetraCDD in breast milk. Food intake might contribute partly to the increased levels of dioxin congeners other than 2,3,7,8-tetraCDD in breast milk. These results suggest that Bien Hoa Air Base has led to elevated 2,3,7,8-tetraCDD levels in breast milk of mothers in nearby areas even in the recent years.
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Affiliation(s)
- Tran Ngoc Nghi
- §Department of Public Health, Kanazawa Medical University, 1-1 Daigaku, Uchinada, Ishikawa 920-0293, Japan
- ΣMinistry of Health, Vietnam Government, Hanoi, Vietnam
| | - Muneko Nishijo
- §Department of Public Health, Kanazawa Medical University, 1-1 Daigaku, Uchinada, Ishikawa 920-0293, Japan
| | - Ho Dung Manh
- ¶Division of Health Sciences, Graduate School of Medical Science, Kanazawa University, Kanazawa, Ishikawa 920-0942, Japan
| | - Pham The Tai
- #Biomedical and Pharmaceutical Research Center, Vietnamese Military Medical University, Ha Dong, Hanoi, Vietnam
| | - Hoang Van Luong
- #Biomedical and Pharmaceutical Research Center, Vietnamese Military Medical University, Ha Dong, Hanoi, Vietnam
| | - Tran Hai Anh
- #Biomedical and Pharmaceutical Research Center, Vietnamese Military Medical University, Ha Dong, Hanoi, Vietnam
| | - Pham Ngoc Thao
- #Biomedical and Pharmaceutical Research Center, Vietnamese Military Medical University, Ha Dong, Hanoi, Vietnam
| | - Nguyen Viet Trung
- #Biomedical and Pharmaceutical Research Center, Vietnamese Military Medical University, Ha Dong, Hanoi, Vietnam
| | - Tomoo Waseda
- ‡Department of Obstetrics and Gynecology, Kanazawa Medical University, 1-1 Daigaku, Uchinada, Ishikawa 920-0293, Japan
| | - Hideaki Nakagawa
- §Department of Public Health, Kanazawa Medical University, 1-1 Daigaku, Uchinada, Ishikawa 920-0293, Japan
| | - Teruhiko Kido
- ¶Division of Health Sciences, Graduate School of Medical Science, Kanazawa University, Kanazawa, Ishikawa 920-0942, Japan
| | - Hisao Nishijo
- ⊥System Emotional Science, Graduate School of Medicine, University of Toyama, 2630 Sugitani, Toyama 930-0194, Japan
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9
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Armitage JM, Ginevan ME, Hewitt A, Ross JH, Watkins DK, Solomon KR. Environmental fate and dietary exposures of humans to TCDD as a result of the spraying of Agent Orange in upland forests of Vietnam. THE SCIENCE OF THE TOTAL ENVIRONMENT 2015; 506-507:621-630. [PMID: 25433383 DOI: 10.1016/j.scitotenv.2014.11.026] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/15/2014] [Revised: 10/20/2014] [Accepted: 11/05/2014] [Indexed: 06/04/2023]
Abstract
The fate and transport of 2,3,7,8-tetrachloro-p-dibenzodioxin (TCDD) released into the environment of South Vietnam (SVN) as a consequence of the aerial application of the herbicidal defoliant Agent Orange (AO) were simulated for a generic upland forest scenario and followed over a 50-year period (1965, 1968 and 1970 onwards). Modeled concentrations of TCDD in the environment were then used as inputs to a human exposure model, which focused on long-term exposures via the food chain. Intake rates and body burdens of TCDD were estimated for adult males over the course of the simulation period and compared to available biomonitoring data. One of the most important factors determining the magnitude of the simulated human exposure to TCDD was the fraction of the chemical deposited directly to soil (where it was assumed to have a degradation half-life of 10 or 15years) relative to the fraction assumed to remain on/in the forest canopy following the spray application (where it was assumed to have a degradation half-life of ≤48h). The simulated body burdens under the various scenarios considered were broadly consistent with the biomonitoring data from SVN collected in the mid-1980s to late 1990s. Taken together, the modeling results and empirical data suggest that highly elevated exposures to TCDD (i.e., body burdens in the several 100s of pg/g lipid range and greater) were not common among people inhabiting upland forest locations in SVN sprayed with AO and that peak and average body burdens were broadly similar to those of the general population of the U.S. in the 1970s and early 1980s. The model-based assessment is consistent with the 'hot spot' hypothesis i.e., potential exposures to TCDD linked to activities conducted on or near former bases where AO was stored are greater than potential exposures in areas subjected to aerial spraying.
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Affiliation(s)
- James M Armitage
- Department of Physical & Environmental Sciences, University of Toronto Scarborough, Toronto, ON M1C 1A4, Canada.
| | - Michael E Ginevan
- M.E. Ginevan & Associates, 307 Hamilton Ave, Silver Spring, MD 20901, USA
| | - Andrew Hewitt
- Centre for Pesticide Application and Safety, The University of Queensland, Gatton, QLD 4343, Australia; Lincoln University, Christchurch 7640, New Zealand; The University of Nebraska, North Platte, NE, USA
| | - John H Ross
- risksciences.net, LLC, 5150 Fair Oaks Blvd. #101-370, Carmichael, CA 95608, USA
| | - Deborah K Watkins
- M.E. Ginevan & Associates, 307 Hamilton Ave, Silver Spring, MD 20901, USA
| | - Keith R Solomon
- Centre for Toxicology, School of Environmental Sciences, University of Guelph, Guelph, ON N1G 2W1, Canada
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Basham KJ, Leonard CJ, Kieffer C, Shelton DN, McDowell ME, Bhonde VR, Looper RE, Welm BE. Dioxin exposure blocks lactation through a direct effect on mammary epithelial cells mediated by the aryl hydrocarbon receptor repressor. Toxicol Sci 2014; 143:36-45. [PMID: 25265996 DOI: 10.1093/toxsci/kfu203] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
Abstract
In mammals, lactation is a rich source of nutrients and antibodies for newborn animals. However, millions of mothers each year experience an inability to breastfeed. Exposure to several environmental toxicants, including 2,3,7,8-tetrachlorodibenzo-p-dioxin (TCDD), has been strongly implicated in impaired mammary differentiation and lactation. TCDD and related polyhalogenated aromatic hydrocarbons are widespread industrial pollutants that activate the aryl hydrocarbon receptor (AHR). Despite many epidemiological and animal studies, the molecular mechanism through which AHR signaling blocks lactation remains unclear. We employed in vitro models of mammary differentiation to recapitulate lactogenesis in the presence of toxicants. We demonstrate AHR agonists directly block milk production in isolated mammary epithelial cells. Moreover, we define a novel role for the aryl hydrocarbon receptor repressor (AHRR) in mediating this response. Our mechanistic studies suggest AHRR is sufficient to block transcription of the milk gene β-casein. As TCDD is a prevalent environmental pollutant that affects women worldwide, our results have important public health implications for newborn nutrition.
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Affiliation(s)
- Kaitlin J Basham
- *Department of Oncological Sciences, Huntsman Cancer Institute, University of Utah, Salt Lake City, Utah 84112, Department of Chemistry, University of Utah, Salt Lake City, Utah 84112 and Department of Surgery, University of Utah, Salt Lake City, Utah 84112
| | - Christopher J Leonard
- *Department of Oncological Sciences, Huntsman Cancer Institute, University of Utah, Salt Lake City, Utah 84112, Department of Chemistry, University of Utah, Salt Lake City, Utah 84112 and Department of Surgery, University of Utah, Salt Lake City, Utah 84112
| | - Collin Kieffer
- *Department of Oncological Sciences, Huntsman Cancer Institute, University of Utah, Salt Lake City, Utah 84112, Department of Chemistry, University of Utah, Salt Lake City, Utah 84112 and Department of Surgery, University of Utah, Salt Lake City, Utah 84112
| | - Dawne N Shelton
- *Department of Oncological Sciences, Huntsman Cancer Institute, University of Utah, Salt Lake City, Utah 84112, Department of Chemistry, University of Utah, Salt Lake City, Utah 84112 and Department of Surgery, University of Utah, Salt Lake City, Utah 84112
| | - Maria E McDowell
- *Department of Oncological Sciences, Huntsman Cancer Institute, University of Utah, Salt Lake City, Utah 84112, Department of Chemistry, University of Utah, Salt Lake City, Utah 84112 and Department of Surgery, University of Utah, Salt Lake City, Utah 84112
| | - Vasudev R Bhonde
- *Department of Oncological Sciences, Huntsman Cancer Institute, University of Utah, Salt Lake City, Utah 84112, Department of Chemistry, University of Utah, Salt Lake City, Utah 84112 and Department of Surgery, University of Utah, Salt Lake City, Utah 84112
| | - Ryan E Looper
- *Department of Oncological Sciences, Huntsman Cancer Institute, University of Utah, Salt Lake City, Utah 84112, Department of Chemistry, University of Utah, Salt Lake City, Utah 84112 and Department of Surgery, University of Utah, Salt Lake City, Utah 84112
| | - Bryan E Welm
- *Department of Oncological Sciences, Huntsman Cancer Institute, University of Utah, Salt Lake City, Utah 84112, Department of Chemistry, University of Utah, Salt Lake City, Utah 84112 and Department of Surgery, University of Utah, Salt Lake City, Utah 84112 *Department of Oncological Sciences, Huntsman Cancer Institute, University of Utah, Salt Lake City, Utah 84112, Department of Chemistry, University of Utah, Salt Lake City, Utah 84112 and Department of Surgery, University of Utah, Salt Lake City, Utah 84112
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11
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Anh NTN, Nishijo M, Tai PT, Maruzeni S, Morikawa Y, Anh TH, Van Luong H, Dam PM, Nakagawa H, Son LK, Nishijo H. Maternal risk factors associated with increased dioxin concentrations in breast milk in a hot spot of dioxin contamination in Vietnam. JOURNAL OF EXPOSURE SCIENCE & ENVIRONMENTAL EPIDEMIOLOGY 2014; 24:489-496. [PMID: 24149970 DOI: 10.1038/jes.2013.73] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/15/2013] [Accepted: 09/03/2013] [Indexed: 06/02/2023]
Abstract
This study looked to identify determinants of exposure to dioxin in breast milk from breast-feeding women in a hot spot of dioxin exposure in Vietnam. Breast milk was collected from 140 mothers 1 month after delivery. The risk factors investigated included length of residency, drinking of well water and the frequency of animal food consumption. Cluster analysis was performed to identify dietary patterns of fish and meat portions, fish variety and egg variety. Residency, age and parity were clearly associated with increased dioxin levels. Drinking well water and the consumption of marine crab and shrimps were related to higher levels of furans in breast milk. The consumption of quail eggs also appeared to be associated with increased levels of some dioxin isomers in this area. Some mothers who ate no or less meat than fish and mothers who consumed more freshwater fish than marine fish had lower levels of dioxins in their breast milk. However, the type of water and the eating habits of mothers contributed only partly to the increased dioxin levels in their breast milk; the length of residency was the most important risk factor associated with increased dioxin body burdens of mothers.
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Affiliation(s)
- Nguyen Thi Nguyet Anh
- Department of Public Health and Epidemiology, Kanazawa Medical University, 1-1 Daigaku, Uchinada, Ishikawa, Japan
| | - Muneko Nishijo
- Department of Public Health and Epidemiology, Kanazawa Medical University, 1-1 Daigaku, Uchinada, Ishikawa, Japan
| | - Pham The Tai
- Biomedical and Pharmaceutical Research Center, Vietnam Military Medical University, Ha Noi, Vietnam
| | - Shoko Maruzeni
- Department of Public Health and Epidemiology, Kanazawa Medical University, 1-1 Daigaku, Uchinada, Ishikawa, Japan
| | - Yuko Morikawa
- School of Nursing, Kanazawa Medical University, 1-1 Daigaku, Uchinada, Ishikawa, Japan
| | - Tran Hai Anh
- Biomedical and Pharmaceutical Research Center, Vietnam Military Medical University, Ha Noi, Vietnam
| | - Hoang Van Luong
- Biomedical and Pharmaceutical Research Center, Vietnam Military Medical University, Ha Noi, Vietnam
| | - Pham Minh Dam
- Biomedical and Pharmaceutical Research Center, Vietnam Military Medical University, Ha Noi, Vietnam
| | - Hideaki Nakagawa
- Department of Public Health and Epidemiology, Kanazawa Medical University, 1-1 Daigaku, Uchinada, Ishikawa, Japan
| | - Le Ke Son
- Vietnam Environment Administration, Ministry of Natural Resources and Environment, Hanoi, Vietnam
| | - Hisao Nishijo
- System Emotional Science, Graduate School of Medicine and Pharmaceutical Sciences, University of Toyama, 2630 Sugitani, Toyama, Japan
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12
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Zhang Y, Nie X, Tao T, Qian W, Jiang S, Jiang J, Li A, Guo A, Xu G, Wu Q. 2,3,7,8-Tetrachlorodibenzo-p-dioxin promotes astrocyte activation and the secretion of tumor necrosis factor-α via PKC/SSeCKS-dependent mechanisms. J Neurochem 2014; 129:839-49. [PMID: 24673440 DOI: 10.1111/jnc.12696] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/13/2014] [Revised: 02/17/2014] [Accepted: 02/18/2014] [Indexed: 12/30/2022]
Abstract
2,3,7,8-tetrachlorodibenzo-p-dioxin (TCDD) is a ubiquitous environmental pollutant that could induce significant toxic effects in the human nervous system. However, the underlying molecular mechanism has not been entirely elucidated. Reactive astrogliosis has implicated in various neurological diseases via the production of a variety of pro-inflammatory mediators. Herein, we investigated the potential role of TCDD in facilitating astrocyte activation and the underlying molecular mechanisms. We showed that TCDD induced rapid astrocyte activation following TCDD exposure, which was accompanied by significantly elevated expression of Src-Suppressed-C Kinase Substrate (SSeCKS), a protein involved in protein kinase C (PKC)-mediated Nuclear Factor kappa B signaling, suggesting a possible involvement of PKC-induced SSeCKS activation in TCDD-triggered reactive astroglia. In keeping with the finding, we found that the level of phosphorylated Nuclear Factor kappa B p65 was remarkably increased after TCDD treatment. Furthermore, interference of SSeCKS attenuated TCDD-induced inducible nitric oxide synthase, glial fibrillary acidic protein, phospho-p65 expression, and tumor necrosis factor-α secretion in astrocytes. In addition, pre-treatment with PKC inhibitor also attenuated TCDD-induced astrocyte activation, as well as SSeCKS expression. Interestingly, we found that TCDD treatment could lead to SSeCKS perinuclear localization, which could be abolished after treatment with PKC inhibitor. Finally, we showed that inhibition of PKC activity or SSeCKS expression would impair TCDD-triggered tumor necrosis factor-α secretion. Our results suggested that TCDD exposure could lead to astrocyte activation through PKC/SSeCKS-dependent mechanisms, highlighting that astrocytes might be important target of TCDD-induced neurotoxicity. 2,3,7,8-tetrachlorodibenzo-p-dioxin (TCDD) elicits neurotoxic effects. Here, we show TCDD induces pro-inflammatory responses in astrocytes. TCDD initiates an increase of [Ca2+]i, followed by the activation of PKC, which then induces the activation of Src-suppressed C-kinase substrate (SSeCKS). SSeCKS promotes NF-κB activation and the secretion of TNF-α and nitric oxide in astrocytes.
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Affiliation(s)
- Yang Zhang
- Department of Nutrition and Food Hygieney, School of Public Health, Nantong University, Nantong, Jiangsu, China
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13
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Watson JD, Prokopec SD, Smith AB, Okey AB, Pohjanvirta R, Boutros PC. TCDD dysregulation of 13 AHR-target genes in rat liver. Toxicol Appl Pharmacol 2014; 274:445-54. [DOI: 10.1016/j.taap.2013.12.004] [Citation(s) in RCA: 29] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/27/2013] [Revised: 12/02/2013] [Accepted: 12/05/2013] [Indexed: 12/20/2022]
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14
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Tai PT, Nishijo M, Anh NTN, Maruzeni S, Nakagawa H, Van Luong H, Anh TH, Honda R, Kido T, Nishijo H. Dioxin exposure in breast milk and infant neurodevelopment in Vietnam. Occup Environ Med 2013; 70:656-62. [PMID: 23390198 DOI: 10.1136/oemed-2012-101021] [Citation(s) in RCA: 60] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
Abstract
OBJECTIVES Dioxin levels in the breast milk of mothers residing near hot spots of dioxin contamination areas in South Vietnam remain much higher than in unsprayed areas, suggesting that fetuses and breast-fed infants may be exposed to high levels of dioxins. The present study investigated the association of infant neurodevelopment in early infancy and dioxin exposure during the perinatal period. METHODS The study involved 216 mother-infant pairs living near the Da Nang airbase, a dioxin contaminated area in Vietnam. Mothers and infants were followed from birth until infants were 4 months old. Dioxin levels in breast milk were measured to estimate the perinatal dioxin exposure, including the infant daily dioxin intake (DDI) via breastfeeding. Infant neurodevelopmental parameters, including cognitive, language and motor domains were assessed at approximately 4 months using the Bayley Scales of Infant and Toddler Development, third edition (Bayley-III). RESULTS The level of 2,3,7,8-tetrachlorodibenzo-p-dioxin and polychlorinated dibenzo-p-dioxins/furans-toxic equivalents in breast milk and the infant DDI showed significant inverse correlations with neurodevelopmental scores. When the subjects were divided into four groups according to dioxin levels in breast milk, the moderate and high DDI groups had significantly lower cognitive, composite motor and fine motor scores, and the high polychlorinated dibenzo-p-dioxins/furans-toxic equivalents group had significantly lower fine motor score than the low exposure group. For all domains, neurodevelopmental scores were decreased with increase in the level of 2,3,7,8-tetrachlorodibenzo-p-dioxin. CONCLUSION The present study demonstrates a considerable impact of perinatal dioxin exposure on neurodevelopment in 4-month-old infants living in contaminated areas in Vietnam.
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Affiliation(s)
- Pham The Tai
- Department of Public Health, Kanazawa Medical University, Uchinada, Ishikawa, Japan
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15
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Impact of perinatal dioxin exposure on infant growth: a cross-sectional and longitudinal studies in dioxin-contaminated areas in Vietnam. PLoS One 2012; 7:e40273. [PMID: 22815734 PMCID: PMC3398034 DOI: 10.1371/journal.pone.0040273] [Citation(s) in RCA: 45] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/09/2012] [Accepted: 06/04/2012] [Indexed: 11/19/2022] Open
Abstract
Dioxin exposure levels remain elevated in residents living around former US Air Force bases in Vietnam, indicating potential adverse impacts on infant growth. In this study, 210 mother-infant pairs in dioxin-contaminated areas in Vietnam were recruited at the infants' birth and followed up for 4 months. Perinatal dioxin exposure levels were estimated by measurement of polychlorinated dibenzo-p-dioxins/furans toxic equivalent (PCDDs/Fs-TEQ) in breast milk. The infants' size was measured at birth and 1 and 4 months after birth, and neurodevelopment was evaluated using the Bayley Scales III at 4 months of age. Among 4 dioxin groups (<25, 25-50, 50-75, ≥75 percentile of PCDDs/Fs-TEQ), cross-sectional comparisons of body size and neurodevelopment scales and comparisons of longitudinally assessed body size were performed respectively. At birth, head circumference of girls in the ≥75 percentile group was significantly larger than those in the <25 and 50-75 percentile groups. At 4 months of age, the weight and body mass index (BMI) of boys in the ≥75 percentile group were significantly lower than those in the other groups. Increase in weight was significantly lower in the ≥75 percentile group in both sexes from birth to 1 month but only in boys at 1-4 months of age. Estimated marginal mean values in a mixed model of weight and BMI during the first 4 months of life were significantly lower in the ≥75 percentile group in boys. In girls, marginal mean values for head circumference were increased with increase in dioxin levels. Only in boys, cognitive, language, and fine motor scores in the ≥75 percentile group were significantly lower than those in the other groups. These results suggested a considerable impact of perinatal dioxin exposure on infant growth, particularly in boys exposed to dioxins at high level of PCDDs/Fs-TEQ.
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16
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Tai PT, Nishijo M, Kido T, Nakagawa H, Maruzeni S, Naganuma R, Anh NTN, Morikawa Y, Luong HV, Anh TH, Hung NN, Son LK, Tawara K, Nishijo H. Dioxin concentrations in breast milk of Vietnamese nursing mothers: a survey four decades after the herbicide spraying. ENVIRONMENTAL SCIENCE & TECHNOLOGY 2011; 45:6625-32. [PMID: 21718047 DOI: 10.1021/es201666d] [Citation(s) in RCA: 58] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/19/2023]
Abstract
In an operation by United States Armed Forces during 1961 to 1971, large quantities of herbicides were sprayed in South Vietnam. These herbicides contained 2,3,7,8-tetrachlorodibenzo-p-dioxin (2,3,7,8-tetraCDD), the most toxic congener of dioxins. Several decades after the herbicide spraying ceased, dioxin concentrations in the environment and human remained elevated in the sprayed areas. Breast milk samples from 520 nursing mothers residing in areas including the hot spots as well as the sprayed and unsprayed areas were collected to quantify the levels of dioxins. The total toxic equivalents of 2,3,7,8-substitued PCDDs/PCDFs in breast milk of mothers living in the hot spots, and the sprayed and unsprayed areas were 14.10 pg/g lipid, 10.89 pg/g lipid, and 4.09 pg/g lipid for primiparae and 11.48 pg/g lipid, 7.56 pg/g lipid, and 2.84 pg/g lipid for multiparae, respectively, with significant differences in the values among the three areas. In the hot spots, dioxin levels were highly correlated with the residency of mothers after adjustment for their age and parity.
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Affiliation(s)
- Pham The Tai
- Department of Epidemiology and Public Health, Kanazawa Medical University, Uchinada, Ishikawa, Japan.
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17
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Wei X, Leung KS, Wong MH, Giesy J, Cai ZW, Wong CKC. Assessment of risk of PCDD/Fs and dioxin-like PCBs in marine and freshwater fish in Pearl River Delta, China. MARINE POLLUTION BULLETIN 2011; 63:166-171. [PMID: 21392810 DOI: 10.1016/j.marpolbul.2011.02.025] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/22/2010] [Revised: 02/14/2011] [Accepted: 02/15/2011] [Indexed: 05/30/2023]
Abstract
Fish consumption is known to be beneficial to human health. However since the age of industrialization, the released/disposed chemical pollutants into water systems make fish a source of various environmental toxicants to humans. In oceanic cities with heavy industrial activities, fish products contribute the greatest proportion of exposure to pollutants. In this study, risks and potential effects of dioxins to health of coastal populations in the Pearl River Delta were assessed. Concentrations of polychlorinated dibenzo-p-dioxins (PCDDs), polychlorinated dibenzofurans (PCDFs), and dioxin-like polychlorinated biphenyls (PCBs) were measured in common fish species purchased at local markets. Concentrations of total dioxins in fish ranged from 0.481 to 9.05 pg TEQ/g wet weight were similar to the lesser concentrations reported for fish from other countries. The greatest concentrations of dioxins were measured in mandarin fish, a carnivorous freshwater fish. Exposure of murine primary leydig and ovarian cells to 2,3,7,8-tetrachlorinated dibenzo-p-dioxins (2,3,7,8-TCDD) reduced the synthesis of progesterone, testosterone and/or estrogen. The reductions were probably via inhibitory effects on the expression of the steroidogenic enzymes, steroidogenic acute regulatory protein (StAR) and cytochrome P450 side-chain cleavage enzyme (P450scc). Based on these reproductive parameters, the concentrations of dioxins and dioxin-like residues represent a moderate health risk due to consumption of fish.
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Affiliation(s)
- X Wei
- Croucher Institute of Environmental Sciences, Department of Biology, Hong Kong Baptist University, Hong Kong, PR China
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18
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Saito K, Nhu DD, Suzuki H, Kido T, Naganuma R, Sakakibara C, Tawara K, Nishijo M, Nakagawa H, Kusama K, Dung PT, Thom LH, Hung NN. Association between dioxin concentrations in breast milk and food group intake in Vietnam. Environ Health Prev Med 2009; 15:48-56. [PMID: 19756928 DOI: 10.1007/s12199-009-0106-9] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/20/2009] [Accepted: 08/03/2009] [Indexed: 11/26/2022] Open
Abstract
OBJECTIVES To clarify the association between dioxin concentrations in breast milk and food group intake in herbicide-sprayed and nonsprayed areas in Vietnam. METHODS This survey was conducted in August 2007 in sprayed and nonsprayed areas, respectively. The interviews were performed using a questionnaire to obtain information on personal characteristics and usual dietary intake. Eighty mothers of sprayed area and 42 mothers of nonsprayed area participated in the study. Breast milk was analyzed for concentration of polychlorinated dibenzo-p-dioxins (PCDDs) and polychlorinated dibenzofurans (PCDFs). RESULTS Multiple regression analysis showed that location (sprayed or nonsprayed area) has the highest association with the toxic equivalents (TEQ)-PCDDs, TEQ-PCDFs, and TEQ-Total rather than other factors. In the sprayed area, the adjusted R (2) values of regression were approximately 0.1. On the other hand, the adjusted R (2) values in the nonsprayed areas were higher than those in the sprayed area, i.e., between 0.2 and 0.3, and showed that there were significant associations with body mass index (BMI) in all models. CONCLUSIONS Dioxin exposure was less affected by usual dietary intake in the sprayed area than in the nonsprayed area in Vietnam. It was clear that past exposure rather than present dietary intake may affect present dioxin concentrations in breast milk in the sprayed area in Vietnam. This study suggests that present dioxin concentrations in breast milk were maintained by continuous past exposure even after 30-40 years had passed.
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Affiliation(s)
- Kae Saito
- Graduate School of Medical Science, Kanazawa University, 5-11-80 Kodatsuno, Kanazawa, Ishikawa, 920-0942, Japan,
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19
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Schecter A, Needham L, Pavuk M, Michalek J, Colacino J, Ryan J, Päpke O, Birnbaum L. Agent Orange exposure, Vietnam War veterans, and the risk of prostate cancer. Cancer 2009; 115:3369-71. [DOI: 10.1002/cncr.24365] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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20
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Chamie K, deVere White RW, Lee D, Ok J, Ellison LM. Agent Orange exposure, Vietnam War veterans, and the risk of prostate cancer. Cancer 2008; 113:2464-70. [DOI: 10.1002/cncr.23695] [Citation(s) in RCA: 65] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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21
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Covaci A, Voorspoels S, Schepens P, Jorens P, Blust R, Neels H. The Belgian PCB/dioxin crisis-8 years later An overview. ENVIRONMENTAL TOXICOLOGY AND PHARMACOLOGY 2008; 25:164-170. [PMID: 21783853 DOI: 10.1016/j.etap.2007.10.003] [Citation(s) in RCA: 33] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/31/2023]
Abstract
In January 1999, 50kg polychlorinated biphenyls (PCBs) contaminated with 1g dioxins were accidentally added to a stock of recycled fat used for the production of 500tonnes animal feed in Belgium. Although signs of poultry poisoning were noticed by February 1999, the extent of the contamination was publicly announced only in May 1999, when it appeared that more than 2500 poultry and pig farms could have been involved. This has resulted in a major food crisis, known worldwide as the "Belgian PCB/dioxin crisis". The crisis was resolved by the implementation of a large food monitoring program for the seven PCB markers (PCBs 28, 52, 101, 118, 138, 153 and 180). When PCB concentrations exceeded the tolerance levels of 100, 200 or 1000ng/g fat for milk, meat or animal feed, respectively, the 17 toxic polychlorinated dibenzodioxins and furans (PCDD/Fs) congeners were also determined. By December 1999, more than 55,000 PCB and 500 dioxin analyses were already done by Belgian and international laboratories. The highest concentrations of PCBs and dioxins and the highest percentage of affected animals were found in poultry. Several important consequences of the food crisis were: (1) the introduction in 1999 of norms for PCBs in feedstuffs and food in Belgium followed by the introduction in 2002 of European harmonized norms for PCDD/Fs in animal feed and food of animal origin; (2) the systematic national monitoring of food of animal origin; and (3) the creation of the Federal Agency for Food Safety in Belgium. The human health risk following this major incident was assessed with contradictory results. It was suggested that, since only a limited proportion of the food chain was contaminated, it is unlikely that adverse effects were inflicted in the Belgian population. However, another assessment suggests that neurotoxic and behavioural effects in neonates, together with an increase in the number of cancers, may be observed.
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Affiliation(s)
- Adrian Covaci
- Toxicological Centre, Department of Pharmaceutical Sciences, University of Antwerp, Universiteitsplein 1, 2610 Wilrijk, Belgium; Laboratory of Ecophysiology, Biochemistry and Toxicology, Department of Biology, University of Antwerp, Groenenborgerlaan 171, B-2020 Antwerp, Belgium
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22
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Schecter A, Constable JD. Commentary: Agent Orange and birth defects in Vietnam. Int J Epidemiol 2006; 35:1230-2. [PMID: 16914479 DOI: 10.1093/ije/dyl135] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
Affiliation(s)
- Arnold Schecter
- University of Texas School of Public Health, Dallas Campus, Dallas, TX, USA.
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Hood DB, Woods L, Brown L, Johnson S, Ebner FF. Gestational 2,3,7,8-tetrachlorodibenzo-p-dioxin exposure effects on sensory cortex function. Neurotoxicology 2006; 27:1032-42. [PMID: 16839606 DOI: 10.1016/j.neuro.2006.05.022] [Citation(s) in RCA: 31] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/24/2006] [Revised: 05/16/2006] [Accepted: 05/16/2006] [Indexed: 11/22/2022]
Abstract
Gestational exposure to environmental contaminants such as 2,3,7,8-tetrachlorodibenzo-p-dioxin (TCDD) poses a significant threat to normal growth and differentiation of the developing brain. To characterize the impact of gestational TCDD exposure on subsequent cortical function, pregnant Long Evans rats were exposed to a single acute dose (100 or 700ng/kg b.w. via gavage) on gestational day 15. This dosing regimen had no significant effect on birth index. After the TCDD-exposed animals were born and reached maturity, neural activity was recorded under urethane anesthesia from neurons in primary somatic sensory cortex. Spontaneous activity was reduced by approximately 50% in barrel cortex compared to corn oil vehicle controls. The magnitude of neuronal response to sensory (whisker) stimuli also was significantly reduced, and responses did not achieve control levels at any stimulus intensity. The greatest deficit was in the short latency component of the cortical responses. These decrements in cortical responsiveness were present in young F1 generation TCDD-exposed animals and persisted for up to 180 days. Because glutamate receptors are crucial to the evoked responses and show developmental regulation, selected iontotropic glutamate receptor subunits (NMDA NR2A+NR2B and GluR1) were profiled for RNA levels in the cortex of F1 generation rats. The expression of NR2B (NMDA receptor) and GluR1 (AMPA receptor) subunits was significantly reduced in the TCDD-exposed F1 generation animals compared to vehicle controls. The results indicate that gestational TCDD exposure results in cortical deficits that are paralled by diminished expression of certain NMDA and AMPA receptor subunits at a time when synapses are being formed for the first time in cortex.
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MESH Headings
- Action Potentials/drug effects
- Action Potentials/radiation effects
- Analysis of Variance
- Animals
- Animals, Newborn
- Blotting, Western/methods
- Cells, Cultured
- Dose-Response Relationship, Drug
- Dose-Response Relationship, Radiation
- Electric Stimulation/methods
- Environmental Pollutants/toxicity
- Female
- Gene Expression Regulation, Developmental/drug effects
- Neurons, Afferent/drug effects
- Polychlorinated Dibenzodioxins/toxicity
- Pregnancy
- Prenatal Exposure Delayed Effects/chemically induced
- Prenatal Exposure Delayed Effects/pathology
- Prenatal Exposure Delayed Effects/physiopathology
- RNA, Messenger/biosynthesis
- Rats
- Rats, Long-Evans
- Receptors, N-Methyl-D-Aspartate/genetics
- Receptors, N-Methyl-D-Aspartate/metabolism
- Reverse Transcriptase Polymerase Chain Reaction/methods
- Somatosensory Cortex/cytology
- Spectrum Analysis
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Affiliation(s)
- Darryl B Hood
- Department of Biomedical Sciences, Division of Neurobiology and Neurotoxicology, Center for Molecular and Behavioral Neuroscience, Meharry Medical College, Nashville, TN 37208, USA
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