4 0 0 0 OA メチル水銀,水銀およびセレンに関する研究動向
- 著者
- 苅田 香苗 坂本 峰至 吉田 稔 龍田 希 仲井 邦彦 岩井 美幸 岩田 豊人 前田 恵理 柳沼 梢 佐藤 洋 村田 勝敬
- 出版者
- 日本衛生学会
- 雑誌
- 日本衛生学雑誌 (ISSN:00215082)
- 巻号頁・発行日
- vol.71, no.3, pp.236-251, 2016 (Released:2016-09-30)
- 参考文献数
- 136
- 被引用文献数
- 14
More than sixty years has passed since the outbreak of Minamata disease, and high-level methylmercury contaminations now seem nonexistent in Japan. However, mercury has been continuously discharged from natural sources and industrial activities, and the health effects on children susceptible to methylmercury exposure at low levels, in addition to mercury contamination from mercury or gold mining areas in developing countries, become a worldwide concern. In this article, we provide a recent overview of epidemiological studies regarding methylmercury and mercury. The following findings were obtained. (1) Many papers on exposure assessment of methylmercury/mercury have been published since the Minamata Convention on Mercury was adopted in 2013. (2) The most crucial problem is child developmental neurotoxicity resulting from prenatal exposure to methylmercury, but its precise assessment seems to be difficult because most of such effects are neither severe nor specific. (3) Several problems raised in birth cohort studies (e.g., whether IQ deficits due to prenatal methylmercury exposure remain when the children become adults, or whether the postnatal exposure at low levels also causes such adverse effects in children) remain unsolved. (4) Concurrent exposure models of methylmercury, lead, polychlorinated biphenyls, aresenic, and organochlorine pesticides, as well as possible antagonists such as polyunsaturated fatty acids and selenium, should be considered in the study design because the exposure levels of methylmercury are extremely low in developed countries. (5) Further animal experiments and molecular biological studies, in addition to human studies, are required to clarify the mechanism of methylmercury toxicity.
2 0 0 0 OA エコチル調査における化学物質曝露評価
- 著者
- 中山 祥嗣 磯部 友彦 岩井 美幸 小林 弥生 小栗 朋子 竹内 文乃
- 出版者
- 一般社団法人日本衛生学会
- 雑誌
- 日本衛生学雑誌 (ISSN:00215082)
- 巻号頁・発行日
- vol.73, no.2, pp.156-163, 2018 (Released:2018-05-31)
- 参考文献数
- 37
- 被引用文献数
- 1 1
In this review, we present an initial plan for exposure assessment in the Japan Environment and Children’s Study (JECS) by focusing on a biomonitoring technique and discuss the challenges encountered when using the biomonitoring technique for exposure measurements. JECS registered 103,099 pregnant mothers and has been following children born to them. Various biological samples were collected from mothers during pregnancy (blood and urine), at birth (blood and hair) and at check-up one month after birth (breast milk). Samples were also collected from children at birth (cord blood) and at check-up one month after birth (hair and blood spot). Those samples will be used to assess maternal and foetal exposures to chemical substances. Measurement reliability, i.e., intraclass correlation coefficient (ICC), and attenuation bias related to low ICCs should be taken into consideration when using the biomonitoring results. Along with the biomonitoring technique, simulation models, pharmacokinetic (PK) models and exposomics techniques are under development in JECS. New analytical techniques include deciduous teeth measurements and -omics analyses. In particular, PK models and sensor technologies are one of the most important methodologies for future JECS exposure analyses. Statistical methods for examining the effects of intercorrelated multiple exposures as well as nondetection data should also be explored.