Concentrations of polybrominated diphenyl ethers (PBDEs) and 2,4,6-tribromophenol in human placental tissues |
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| Institution: | 1. Nicholas School of the Environment, Duke University, Durham, NC, USA;2. Department of Statistics, Rice University, Houston, TX, USA;1. Key Laboratory of Public Health Safety, Ministry of Education, School of Public Health, Fudan University, Shanghai, China;2. CITIC Medical & Health Group, Beijing, China;3. Department of Health Management, Jiangxi University of Traditional Chinese Medicine, China;4. Obstetrics & Gynecology Hospital, Fudan University, Shanghai, China;5. State Key Laboratory of Pollution Control and Resources Reuse, School of Environmental Science and Engineering, Tongji University, Shanghai, China;1. Unit of Molecular Cancer Epidemiology, Universitary Institute of Oncology of the Principality of Asturias (IUOPA), Spain;2. Department of Preventive Medicine and Public Health, University of Oviedo, Julián Clavería, s/n, 33006 Oviedo, Asturias, Spain;3. Department of Environmental Chemistry, Institute of Environmental Assessment and Water Research (IDÆA-CSIC), Jordi Girona, 18, 08034 Barcelona, Catalonia, Spain;4. Spanish Consortium for Research on Epidemiology and Public Health (CIBERESP), Melchor Fernández Almagro, 3-5, 28029, Madrid, Spain |
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| Abstract: | Legacy environmental contaminants such as polybrominated diphenyl ethers (PBDEs) are widely detected in human tissues. However, few studies have measured PBDEs in placental tissues, and there are no reported measurements of 2,4,6-tribromophenol (2,4,6-TBP) in placental tissues. Measurements of these contaminants are important for understanding potential fetal exposures, as these compounds have been shown to alter thyroid hormone regulation in vitro and in vivo. In this study, we measured a suite of PBDEs and 2,4,6-TBP in 102 human placental tissues collected between 2010 and 2011 in Durham County, North Carolina, USA. The most abundant PBDE congener detected was BDE-47, with a mean concentration of 5.09 ng/g lipid (range: 0.12–141 ng/g lipid; detection frequency 91%); however, 2,4,6-TBP was ubiquitously detected and present at higher concentrations with a mean concentration of 15.4 ng/g lipid (range:1.31–316 ng/g lipid; detection frequency 100%). BDE-209 was also detected in more than 50% of the samples, and was significantly associated with 2,4,6-TBP in placental tissues, suggesting they may have a similar source, or that 2,4,6-TBP may be a degradation product of BDE-209. Interestingly, BDE-209 and 2,4,6-TBP were negatively associated with age (rs = − 0.16; p = 0.10 and rs = − 0.17; p = 0.08, respectively). The results of this work indicate that PBDEs and 2,4,6-TBP bioaccumulate in human placenta tissue and likely contribute to prenatal exposures to these environmental contaminants. Future studies are needed to determine if these joint exposures are associated with any adverse health measures in infants and children. |
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