著者

原口 浩一 遠藤 哲也 阪田 正勝 増田 義人 Mark SIMMONDS

出版者

公益社団法人 日本食品衛生学会

雑誌

食品衛生学雑誌 (ISSN:00156426)

巻号頁・発行日

vol.41, no.4, pp.287-296, 2000-08-25 (Released:2008-01-11)

参考文献数

25

被引用文献数

17 27

---

1999年, 全国6都市で販売されていた鯨肉製品61点について, 重金属 (水銀, カドミウム, 鉛) 及び有機塩素系化合物 (PCBs, DDTs, HCHs, HCB, dieldrin) の汚染実態調査を行った. ハクジラの赤身肉では水銀汚染が, ハクジラ及び北太平洋産ミンククジラの脂身にはPCB及び有機塩素系農薬の汚染が顕著にみられた. 鯨肉の多食によってこれらの汚染物質の摂取許容量を超えることも考えられるので, 食品としての安全性を再検討する必要がある.

著者

太田 千穂 枩岡 樹子 原口 浩一 加藤 善久 遠藤 哲也 古賀 信幸

出版者

福岡医学会

雑誌

福岡医学雑誌 (ISSN:0016254X)

巻号頁・発行日

vol.98, no.5, pp.236-244, 2007-05-25

---

Our previous studies have shown that six metabolites, namely 3-hydroxy (OH)-, 3'- OH-, 4'-OH-, 3',4'-dihydroxy (diOH)-, 3'-methylsulfone (CH3SO2)- and 4'-CH3SO2-2,2',4,5,5'- pentachlorobiphenyl (CB101),were found in the serum and liver of rats,hamsters and guinea pigs 4 days after administration of CB101. In this study, the in vitro metabolism of CB101 was studied using liver microsomes of rats, hamsters and guinea pigs, and the effect of cytochrome P450 inducers, phenobarbital (PB) and 3-methylcholanthrene (MC) on CB101 metabolism was also compared. 3-OH-, 3'-OH-, 4'-OH- and 3',4'-diOH-CB101 were formed by liver microsomes of rats,hamsters and guinea pigs except that 3-OH-CB101 was not formed by hamster liver microsomes. In untreated animals, both 3'-OH- and 4'-OH-CB101 were major metabolites. By treatment of PB, 3'-OH-CB101 was increased remarkably to 140-fold of untreated in rats and to 79-fold of untreated in hamsters, and was also increased slightly to 4-fold of untreated in guinea pigs. Moreover,PB-treatment showed a significant increase of3', 4'-diOH-CB101 in rats and hamsters. In contrast, MC-treatment increased 4'-OH-CB101 to 2.0-,9.6-and 3.4-fold of untreated animals in rats,hamsters and guinea pigs,respectively. In all animal species,the formation of 3',4'-diOH-CB101 from 3'-OH-and 4'-OH-CB101 proceeded at much higher rate than that from CB101 and was accelerated by PB-treatment. Only in hamster,MC-treatment decreased 3',4'-diOH-CB101 from 3'-OH-and 4'-OH-CB101 to less than 50% of untreated. Addition of 5 mM reduced glutathione suppressed the formation of 4'-OHCB101 to 43% of control by liver microsomes of MC-treated hamsters, suggesting that 4'-OHCB101 can be formed mainly via 3',4'-epoxide from CB101. These results indicate that the metabolism of CB101 to 3',4'-diOH-CB101 is principally catalyzed by CYP2B enzymes, which prefer 4'-OH-and 3'-OH-CB101 to CB101.