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Zhou, Can-Can; Gao, Zhen-Yan; He, Yu-Qiong; Wu, Mei-Qin; Chen, Fei; Wang, Ju; Liu, Jun-Xia; Yan, Chong-Huai
Chemosphere (Oxford), February 2019, 2019-Feb, 2019-02-00, Letnik: 217Journal Article
Previous studies have shown that toxic metal exposure can have adverse effects on the nervous system of children, but the toxicology of metal co-exposure on neurodevelopment remains to be clarified. Brain derived neurotrophic factor (BDNF) plays an important role in nervous system development, but the possible effects of metal co-exposure on the serum BDNF concentrations of children remain unknown. A total of 561 children living in Taizhou City, China were recruited to participate in our cross-sectional multicenter survey. We measured their blood Pb, Hg, Al and Mn levels and serum BDNF concentrations as well as determined their associations in the total and within sex subgroups. The geometric means of the blood Pb, Hg, Al and Mn levels in all the participants were 67.18 μg/L, 1.01 μg/L, 52.03 μg/L and 18.26 μg/L, respectively. The serum BDNF concentration in children was 19.45 ng/mL. After adjusting for confounders, the blood Pb levels were significantly negatively associated with the serum BDNF concentrations in all the subjects and boys but not in girls. In addition, a significantly negative interaction between blood Pb and blood Hg and a positive interaction between blood Pb and blood Al on serum BDNF concentrations were also observed in boys but not in girls. Our findings highlight the toxic effects of metal co-exposure on serum BDNF levels in pre-school children and indicate that these effects might differ by gender, which suggest that special attention should be paid to the sex-specific effects of metal exposure. •The blood Pb levels were negatively associated with the serum BDNF concentrations in boys, but not in girls.•A negative interaction between the blood Pb and Hg levels on serum BDNF concentrations was found in boys, but not in girls.•A positive interaction between the blood Pb and Al levels on serum BDNF concentrations was found in boys, but not in girls.•Boys are more susceptible to environmental toxic exposure in pre-school children.
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