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We determined dioxin-like polychlorinated biphenyls (PCBs) and PCBs in 6 preserved umbilical cords of fetal Yusho patients and in 11 preserved umbilical cords of Yusho suspected persons who were born ...to mothers with Yusho from 1970 to 2002, which were Yusho group. As a control, we also analyzed dioxin-like PCBs and PCBs in 15 preserved umbilical cords of babies who were born to healthy mothers, which was healthy group, in the same period of time. As a result, concentrations of three dioxin-like PCBs, that is, #156, #157 and #189 which were 6 to 20 times higher in fetal Yusho patients than in healthy babies were still 4 to 6 times greater in Yusho group than in healthy group about 20 years after the outbreak of Yusho, but could not recognize this characteristic anymore about 30 years after the outbreak. Decreasing rate in concentrations of dioxin-like PCBs and PCBs seemed to higher in Yusho group than in healthy group during this period of time. Therefore, we considered due to heavy exposure to PCDFs some drug metabolizing enzymes such as aryl hydrocarbon hydroxylase were induced and excretion of the related agents to fetal Yusho were enhanced from the bodies of Yusho group. In order to clarify this hypothesis, further more detail studies are needed.続きを見る
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