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Kishi R, Araki A, Minatoya M, Hanaoka T, Miyashita C, Itoh S, Kobayashi S, Ait Bamai Y, Yamazaki K, Miura R, Tamura N, Ito K, Goudarzi H. The Hokkaido Birth Cohort Study on Environment and Children's Health: cohort profile-updated 2017. Environ Health Prev Med 2017; 22:46. [PMID: 29165157 PMCID: PMC5664568 DOI: 10.1186/s12199-017-0654-3] [Citation(s) in RCA: 77] [Impact Index Per Article: 11.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/22/2017] [Accepted: 04/25/2017] [Indexed: 12/11/2022] Open
Abstract
The Hokkaido Study on Environment and Children's Health is an ongoing study consisting of two birth cohorts of different population sizes: the Sapporo cohort and the Hokkaido cohort. Our primary study goals are (1) to examine the effects of low-level environmental chemical exposures on birth outcomes, including birth defects and growth retardation; (2) to follow the development of allergies, infectious diseases, and neurobehavioral developmental disorders and perform a longitudinal observation of child development; (3) to identify high-risk groups based on genetic susceptibility to environmental chemicals; and (4) to identify the additive effects of various chemicals, including tobacco smoking. The purpose of this report is to update the progress of the Hokkaido Study, to summarize the recent results, and to suggest future directions. In particular, this report provides the basic characteristics of the cohort populations, discusses the population remaining in the cohorts and those who were lost to follow-up at birth, and introduces the newly added follow-up studies and case-cohort study design. In the Sapporo cohort of 514 enrolled pregnant women, various specimens, including maternal and cord blood, maternal hair, and breast milk, were collected for the assessment of exposures to dioxins, polychlorinated biphenyls, organochlorine pesticides, perfluoroalkyl substances, phthalates, bisphenol A, and methylmercury. As follow-ups, face-to-face neurobehavioral developmental tests were conducted at several different ages. In the Hokkaido cohort of 20,926 enrolled pregnant women, the prevalence of complicated pregnancies and birth outcomes, such as miscarriage, stillbirth, low birth weight, preterm birth, and small for gestational age were examined. The levels of exposure to environmental chemicals were relatively low in these study populations compared to those reported previously. We also studied environmental chemical exposure in association with health outcomes, including birth size, neonatal hormone levels, neurobehavioral development, asthma, allergies, and infectious diseases. In addition, genetic and epigenetic analyses were conducted. The results of this study demonstrate the effects of environmental chemical exposures on genetically susceptible populations and on DNA methylation. Further study and continuous follow-up are necessary to elucidate the combined effects of chemical exposure on health outcomes.
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Affiliation(s)
- Reiko Kishi
- Hokkaido University Center for Environmental and Health Sciences, Kita 12, Nishi 7, Kita-ku, Sapporo, 060-0812, Japan.
| | - Atsuko Araki
- Hokkaido University Center for Environmental and Health Sciences, Kita 12, Nishi 7, Kita-ku, Sapporo, 060-0812, Japan
| | - Machiko Minatoya
- Hokkaido University Center for Environmental and Health Sciences, Kita 12, Nishi 7, Kita-ku, Sapporo, 060-0812, Japan
| | - Tomoyuki Hanaoka
- Hokkaido University Center for Environmental and Health Sciences, Kita 12, Nishi 7, Kita-ku, Sapporo, 060-0812, Japan
| | - Chihiro Miyashita
- Hokkaido University Center for Environmental and Health Sciences, Kita 12, Nishi 7, Kita-ku, Sapporo, 060-0812, Japan
| | - Sachiko Itoh
- Hokkaido University Center for Environmental and Health Sciences, Kita 12, Nishi 7, Kita-ku, Sapporo, 060-0812, Japan
| | - Sumitaka Kobayashi
- Hokkaido University Center for Environmental and Health Sciences, Kita 12, Nishi 7, Kita-ku, Sapporo, 060-0812, Japan
| | - Yu Ait Bamai
- Hokkaido University Center for Environmental and Health Sciences, Kita 12, Nishi 7, Kita-ku, Sapporo, 060-0812, Japan
| | - Keiko Yamazaki
- Hokkaido University Center for Environmental and Health Sciences, Kita 12, Nishi 7, Kita-ku, Sapporo, 060-0812, Japan
| | - Ryu Miura
- Hokkaido University Center for Environmental and Health Sciences, Kita 12, Nishi 7, Kita-ku, Sapporo, 060-0812, Japan
| | - Naomi Tamura
- Hokkaido University Center for Environmental and Health Sciences, Kita 12, Nishi 7, Kita-ku, Sapporo, 060-0812, Japan
- Graduate School of Health Sciences, Hokkaido University, Sapporo, Japan
| | - Kumiko Ito
- Hokkaido University Center for Environmental and Health Sciences, Kita 12, Nishi 7, Kita-ku, Sapporo, 060-0812, Japan
- Department of Public Health, Graduate School of Medicine, Hokkaido University, Sapporo, Japan
| | - Houman Goudarzi
- Hokkaido University Center for Environmental and Health Sciences, Kita 12, Nishi 7, Kita-ku, Sapporo, 060-0812, Japan
- Department of Respiratory Medicine, Faculty of Medicine and Graduate School of Medicine, Hokkaido University, Sapporo, Japan
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Tavakoly Sany SB, Hashim R, Salleh A, Rezayi M, Karlen DJ, Razavizadeh BBM, Abouzari-Lotf E. Dioxin risk assessment: mechanisms of action and possible toxicity in human health. ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH INTERNATIONAL 2015; 22:19434-50. [PMID: 26514567 DOI: 10.1007/s11356-015-5597-x] [Citation(s) in RCA: 49] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/24/2015] [Accepted: 10/08/2015] [Indexed: 05/11/2023]
Abstract
Dioxin-like compounds (DLCs) have been classified by the World Health Organization (WHO) as one of the most persistent toxic chemical substances in the environment, and they are associated with several occupational activities and industrial accidents around the world. Since the end of the 1970s, these toxic chemicals have been banned because of their human toxicity potential, long half-life, wide dispersion, and they bioaccumulate in the food web. This review serves as a primer for environmental health professionals to provide guidance on short-term risk assessment of dioxin and to identify key findings for health and exposure assessment based on policies of different agencies. It also presents possible health effects of dioxins, mechanisms of action, toxic equivalency factors (TEFs), and dose-response characterization. Key studies related to toxicity values of dioxin-like compounds and their possible human health risk were identified through PubMed and supplemented with relevant studies characterized by reviewing the reference lists in the review articles and primary literature. Existing data decreases the scope of analyses and models in relevant studies to a manageable size by focusing on the set of important studies related to the perspective of developing toxicity values of DLCs.
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Affiliation(s)
| | - Rosli Hashim
- Institute of Biological Sciences, University of Malaya, 50603, Kuala Lumpur, Malaysia
| | - Aishah Salleh
- Institute of Biological Sciences, University of Malaya, 50603, Kuala Lumpur, Malaysia
| | - Majid Rezayi
- Chemistry Department, Faculty of Science, University Malaya, 50603, Kuala Lumpur, Malaysia
| | - David J Karlen
- Environmental Protection Commission of Hillsborough County, 3629 Queen Palm Drive, Tampa, FL, 33619-1309, USA
| | - Bi Bi Marzieh Razavizadeh
- Department of Food Chemistry, Research Institute of Food Science and Technology, P.O. Box: 91735-147, Mashhad, Iran
| | - Ebrahim Abouzari-Lotf
- Advanced Materials Research Group, Institute of Hydrogen Economy, Universiti Teknologi Malaysia, International Campus, 54100, Kuala Lumpur, Malaysia
- Malaysia-Japan International Institute of Technology, Universiti Teknologi Malaysia, 54100, Kuala Lumpur, Malaysia
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Sany SBT, Hashim R, Rezayi M, Rahman MA, Razavizadeh BBM, Abouzari-lotf E, Karlen DJ. Integrated ecological risk assessment of dioxin compounds. ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH INTERNATIONAL 2015; 22:11193-11208. [PMID: 25953606 DOI: 10.1007/s11356-015-4511-x] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/17/2014] [Accepted: 04/07/2015] [Indexed: 06/04/2023]
Abstract
Current ecological risk assessment (ERA) schemes focus mainly on bioaccumulation and toxicity of pollutants in individual organisms. Ecological models are tools mainly used to assess ecological risks of pollutants to ecosystems, communities, and populations. Their main advantage is the relatively direct integration of the species sensitivity to organic pollutants, the fate and mechanism of action in the environment of toxicants, and life-history features of the individual organism of concern. To promote scientific consensus on ERA schemes, this review is intended to provide a guideline on short-term ERA involving dioxin chemicals and to identify key findings for exposure assessment based on policies of different agencies. It also presents possible adverse effects of dioxins on ecosystems, toxicity equivalence methodology, environmental fate and transport modeling, and development of stressor-response profiles for dioxin-like chemicals.
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Miyashita C, Sasaki S, Saijo Y, Washino N, Okada E, Kobayashi S, Konishi K, Kajiwara J, Todaka T, Kishi R. Effects of prenatal exposure to dioxin-like compounds on allergies and infections during infancy. ENVIRONMENTAL RESEARCH 2011; 111:551-8. [PMID: 21324443 DOI: 10.1016/j.envres.2011.01.021] [Citation(s) in RCA: 43] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/07/2010] [Revised: 01/22/2011] [Accepted: 01/26/2011] [Indexed: 05/19/2023]
Abstract
Dioxin-like compounds are endocrine disruptors. The effects of prenatal exposure to environmental levels of dioxins on immune function during infancy have not been clarified, although dioxins induce immunosuppression in offspring of animals. Moreover, human studies have not assessed the effects of gender- or congener-specific differences. The purpose of this study was to investigate the association between dioxin levels in maternal blood and the risk of infection and allergies in infancy. We examined 364 mothers and their infants enrolled in a Hokkaido Study on Environment and Children's Health between 2002 and 2005 in Sapporo, Japan. Relevant information was collected from a baseline questionnaire during pregnancy, medical records at delivery, and a follow-up questionnaire when the child was 18 months of age that assessed development of allergies and infections in infancy. Dioxin-like compound levels in maternal blood were measured with high-resolution gas chromatography/high-resolution mass spectrometry. Relatively higher levels of polychlorinated dibenzofuran were associated with a significantly increased risk of otitis media, especially among male infants (odds ratio=2.5, 95% confidence interval=1.1-5.9). Relatively higher levels of 2,3,4,7,8-pentachlorodibenzofuran were also associated with a significantly increased risk of otitis media (odds ratio=5.3, 95% confidence interval=1.5-19). However, we observed a weak association between dioxin-like compound levels and allergic symptoms in infancy. At environmental levels, prenatal exposure to dioxin-like compounds may alter immune function and increase the risk of infections in infancy, especially among males. The compound 2,3,4,7,8-pentachlorodibenzofuran may be responsible for this.
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Affiliation(s)
- Chihiro Miyashita
- Department of Public Health, Hokkaido University Graduate School of Medicine, North 15 West 7 Kita-ku, Sapporo, Hokkaido, Japan
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Olivero-Verbel J, Cabarcas-Montalvo M, Ortega-Zúñiga C. Theoretical targets for TCDD: a bioinformatics approach. CHEMOSPHERE 2010; 80:1160-1166. [PMID: 20605043 DOI: 10.1016/j.chemosphere.2010.06.020] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/20/2009] [Revised: 05/19/2010] [Accepted: 06/07/2010] [Indexed: 05/29/2023]
Abstract
Dioxins are a group of highly toxic molecules that exert their toxicity through the activation of the aryl hydrocarbon receptor (AhR). The most important agonist of the AhR, 2,3,7,8-tetrachlorodibenzo-p-dioxin (TCDD) is a highly toxic compound. Although most of the effects related to TCDD exposure have been linked to the activation of AhR, the objective of this work was to use a bioinformatics approach to identify possible new targets for TCDD. The Target Fishing Docking (TarFisDock) Server was used to find target proteins for TCDD. This virtual screening allowed the identification of binding sites with high affinity for TCDD in diverse proteins, such as metallopeptidases 8 and 3, oxidosqualene cyclase, and myeloperoxidase. Some of these proteins are well known for their biochemical role in some pathological effects of dioxin exposure, including endometriosis, diabetes, inflammation and liver damage. These results suggest that TCDD could also be interacting with cellular targets though AhR-independent pathways.
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Affiliation(s)
- Jesús Olivero-Verbel
- Environmental and Computational Chemistry Group, University of Cartagena, Cartagena, Colombia.
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Cytochrome P450 (CYP1A) induction in sea bream (Sparus Aurata) gills and liver following exposure to polychlorobiphenyls (PCBs). Vet Res Commun 2009; 33 Suppl 1:181-4. [DOI: 10.1007/s11259-009-9279-3] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
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Ao K, Suzuki T, Murai H, Matsumoto M, Nagai H, Miyamoto Y, Tohyama C, Nohara K. Comparison of immunotoxicity among tetrachloro-, pentachloro-, tetrabromo- and pentabromo-dibenzo-p-dioxins in mice. Toxicology 2008; 256:25-31. [PMID: 19041680 DOI: 10.1016/j.tox.2008.10.024] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/04/2008] [Revised: 10/31/2008] [Accepted: 10/31/2008] [Indexed: 11/28/2022]
Abstract
There is concern about the growing environmental levels of brominated dioxins. Brominated dioxins are known to bind and activate the transcription factor aryl hydrocarbon receptor (AhR), as their chlorinated congeners do. However, data on the potency of brominated dioxins for immunotoxicity in vivo is largely lacking, even though the immune system is a vulnerable target for dioxins. In this study, we investigated the immunotoxic effects on mice of the brominated dioxins, 2,3,7,8-tetrabromodibenzo-p-dioxin (TBDD) and 1,2,3,7,8-pentabromodibenzo-p-dioxin (PeBDD), in comparison with those of 2,3,7,8-tetrachlorodibenzo-p-dioxin (TCDD) and 1,2,3,7,8-pentachlorodibenzo-p-dioxin (PeCDD), the two most toxic chlorinated dioxins, to gain insight into the potency of brominated dioxins for immunotoxicity. C57BL/6 mice were dosed with the dioxins and immunized with ovalbumin (OVA), and several endpoints that sensitively detect immunotoxicity were investigated, including IL-5 production by the splenocytes. The results of the present study demonstrated that TCDD and TBDD show identical effects on a per weight basis at 1.0-10mug/kg for all the endpoints examined. PeCDD also showed effects similar to those of TCDD. On the other hand, PeBDD showed somewhat dose-independent effects and was more potent at a lower dose and less potent at a higher dose than PeCDD. Dose-dependent linearity of PeBDD-induced induction of CYP1A1, an AhR target gene, was also less clear in the spleen than in the liver. These results have provided valuable data for estimating the potency of brominated dioxins for immunotoxicity.
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Affiliation(s)
- Kana Ao
- National Institute for Environmental Studies, Tsukuba 305-8506, Japan
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