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Elimination of polychlorinated dibenzofurans (PCDFs) and polychlorinated biphenyls (PCBs) from human blood in the Yusho and Yu-Cheng rice oil poisonings

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Abstract

The pharmacokinetics of polychlorinated dibenzofurans (PCDFs) and polychlorinated biphenyls (PCBs) in humans was studied by monitoring the blood concentrations of individuals who ingested a contaminated rice oil in Japan (yusho) in 1968 and in Taiwan (yu-cheng) in 1979. Sixteen yusho patients were followed from 1982 to 1990 and three yu-cheng individuals from 1980 to 1989. From the three yucheng patients, blood lipid values for the two persistent toxic congeners, 2,3,4,7,8-pentachlorodibenzofuran (PnCDF) and 1,2,3,4,7,8-hexachlorodibenzofuran (HxCDF), varied from 50 μg/kg at first sampling to about 1 μg/kg at last sampling corresponding to half-lives for elimination (t1/2) of 2-21/2 years. The blood lipid values for the same PCDF congeners in yusho patients varied from 5 μg/kg down to 0.1 μg/kg. The calculated t1/2 were more variable with median values closer to 10 years. Planar PCBs #126 and #169 were present at lower concentrations than the PCDFs. For seven of the other PCB congeners, half-lives for elimination in the yu-cheng individuals varied from 1.2 up to 4.6 yr depending on the degree of chlorination. For the yusho patients, the elimination for the PCBs was longer. These results show that clearance of the toxic PCDFs and PCBs in humans is non-linear with faster elimination at higher exposure followed by slower decreases as background levels are approached. Such a clearance pattern can best be explained by a two compartment liver and fat pharmacokinetic model.

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Authors and Affiliations

  1. Food Research Division, Bureau of Chemical Safety, Food Directorate, Health Protection Branch, Health and Welfare Canada, K1A OL2, Ottawa, Canada

    John J. Ryan, Dan Levesque, Luz G. Panopio & Wing F. Sun

  2. Daiichi College of Pharmaceutical Sciences, 815, Fukuoka, Japan

    Yoshito Masuda & Hiroaki Kuroki

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  1. John J. Ryan
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  2. Dan Levesque
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  3. Luz G. Panopio
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  4. Wing F. Sun
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  5. Yoshito Masuda
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  6. Hiroaki Kuroki
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Ryan, J.J., Levesque, D., Panopio, L.G. et al. Elimination of polychlorinated dibenzofurans (PCDFs) and polychlorinated biphenyls (PCBs) from human blood in the Yusho and Yu-Cheng rice oil poisonings. Arch. Environ. Contam. Toxicol. 24, 504–512 (1993). https://doi.org/10.1007/BF01146170

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  • DOI: https://doi.org/10.1007/BF01146170

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