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中国南部の学童における多環芳香族炭化水素およびフタル酸塩への共曝露と酸化ストレス障害との関連
Co-exposure to polycyclic aromatic hydrocarbons and phthalates and their associations with oxidative stress damage in school children from South China.
PMID: 32659584 DOI: 10.1016/j.jhazmat.2020.123390.
抄録
中国深圳市の8~11歳の学童の尿中の一水酸化多環芳香族炭化水素(OH-PAH),フタル酸代謝物(mPAE),8-ヒドロキシ-2'-デオキシグアノシン(8-OHdG)を測定し,PAHとPAEの共曝露による酸化ストレス障害を検討した.尿中のOH-PAHs濃度は0.36-36.5(中央値:3.86),mPAE濃度は9.48-1609(中央値:240)ng/mLであった。ΣOH-PAHsとΣmPAEの尿中濃度には性別と年齢は影響しなかったが、地理的な違い(都市部と郊外の違い)が観察された。8-OHdGのレベルは尿中OH-PAHおよびmPAEと正の相関があり、相関係数(r)は0.160から0.365の間で変化した(p<0.05)。これら2種類の汚染物質が同濃度で存在する場合、OH-PAHはmPAEよりも酸化的DNA損傷に寄与していた。ヒトの健康リスクは、ハザード商と化学物質の複合体の累積リスクのハザード指数を用いて評価した。その結果、PAH類によるリスクは無視できるが、29.5%の学童がPAE、特にフタル酸ジエチルヘキシルによる明らかな健康リスクにさらされている可能性があることが示された。
Monohydroxylated polycyclic aromatic hydrocarbons (OH-PAHs), phthalate metabolites (mPAEs), and 8-hydroxy-2'-deoxyguanosine (8-OHdG) in the urine of school children aged 8-11 years from Shenzhen, China were measured in order to investigate oxidative stress damage from co-exposure to PAHs and PAEs. The concentrations of OH-PAHs and mPAEs in urine were 0.36-36.5 (median: 3.86) and 9.48-1609 (median: 240) ng/mL respectively. Gender and age did not influence urinary concentrations of ΣOH-PAHs and ΣmPAEs, but geographical variations (i.e., urban versus suburban) were observed. Levels of 8-OHdG were positively correlated with urinary OH-PAHs and mPAEs, with correlation coefficients (r) varying between 0.160 and 0.365 (p < 0.05). OH-PAHs made a greater contribution to oxidative DNA damage than mPAEs when these two types of pollutants were present at the same concentrations. Human health risks were assessed using the hazard quotient and the hazard index for the cumulative risk of a complex of chemicals. The results demonstrated that risks from PAHs could be neglected, but that 29.5 % of school children may be subject to obvious health risks from PAEs, especially diethylhexyl phthalate.
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