Abstract
We aimed to determine the relationship between dioxin congeners in maternal breast milk and maternal glucocorticoid levels with newborn birth weight after nearly 45 years of use of herbicides in the Vietnam War. The study subjects comprised 58 mother–infant pairs in a region with high dioxin levels in the soil (hotspot) and 62 pairs from a control region. Dioxin levels in maternal breast milk were measured by HRGC-HRMS. Salivary glucocorticoid levels were determined by LC-MS/MS. Dioxin congener levels in mothers from the hotspot were found to be two to fivefold higher than those in mothers from the control region. Birth weight was inversely correlated with 2,3,7,8-TeCDD and 2,3,4,7,8-PeCDF congener levels. The rate of newborns whose birth weight was less than 2500 g was threefold higher in the hotspot (12 %) than in the control region (4 %). Salivary glucocorticoid levels in mothers with low birth weight infants were significantly higher than those in the normal birth weight group. Low birth weight of Vietnamese newborns in a hotspot for dioxin levels is related to some dioxin congener levels and high glucocorticoid levels in mothers. This finding in mother–infant pairs suggests that excess maternal glucocorticoid levels are related to dioxin burden and they result in low birth weight.
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Acknowledgments
The authors thank the medical staff at Kim Bang and Phu Cat medical centers for their assistance. We would also like to thank all of the women and their families who participated in the study. Furthermore, we thank the officers of the 10–80 Division, Hanoi Medical University, Vietnam, for making this study possible.
This study was supported by Grant-in-Aid for Scientific Research (A) from the Japan Society for the Promotion of Science (19209021.) and Pfizer Health Research Foundation.
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The Medical Ethics Committee of Kanazawa University approved this study. The permission number was Health 89 in 2007. All lactating mothers provided written informed consent.
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Van Tung, D., Kido, T., Honma, S. et al. Low birth weight of Vietnamese infants is related to their mother’s dioxin and glucocorticoid levels. Environ Sci Pollut Res 23, 10922–10929 (2016). https://doi.org/10.1007/s11356-016-6233-0
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DOI: https://doi.org/10.1007/s11356-016-6233-0