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[A memoir of my researches on xenobiotic metabolism for 48 years--researches on Kanemi Yusho and endocrine disrupting chemicals].

Abstract
The author started a research on xenobiotic metabolism at Graduate School of Pharmaceutical Sciences, Kyushu University in 1965. In 1968, an epidemic of a "strange disease", called Yusho, occurred in western Japan. The epidemic was soon identified to be a food poisoning caused by the ingestion of commercial Kanemi rice bran oil which had been accidentally contaminated with large amounts of polychlorinated biphenyls (PCBs) and their related compounds such as polychlorinated dibenzofurans (PCDFs.) At first, in this review, our toxicological studies on Yusho during the early thirty years were briefly described. Next, the studies on aldehyde oxidase, a molybdenum hydroxylase, which is involved in the lactam formation reaction such as 1-phenyl-2-(2-oxopyrrolidine)pentane(oxoprolintane) from 1-phenyl-2-pyrrolidinopentane(prolintane) and 1-methyl-4-phenyl-1,2,3,6-tetrahydropyridine(MPTP) lactam from 1-methyl-4-phenyl-2,3-dihydropyridinium ion (MPDP⁺) were also presented. Finally, we investigated how the xenobiotic metabolism of endocrine disrupting chemicals such as bisphenol A (BPA) and some isoflavones affects their estrogenic activities. In this study, we demonstrated that BPA is converted to 4-methyl-2,4-bis(4-hydroxyphenyl)pent-1-ene (MBP), an active metabolite as estrogen, by rat liver S9. In the cases of isoflavones, although genistein was inactivated, biochanin A, 4'-methoxy analogue of genistein, was activated to genistein by O-demethylation with rat liver S9.
AuthorsShin'ichi Yoshihara
JournalYakugaku zasshi : Journal of the Pharmaceutical Society of Japan (Yakugaku Zasshi) Vol. 133 Issue 7 Pg. 747-72 ( 2013) ISSN: 1347-5231 [Electronic] Japan
PMID23811764 (Publication Type: English Abstract, Journal Article, Review)
Chemical References
  • Endocrine Disruptors
  • Xenobiotics
  • Polychlorinated Biphenyls
Topics
  • Animals
  • Endocrine Disruptors (metabolism)
  • Humans
  • Polychlorinated Biphenyls (metabolism)
  • Porphyrias (metabolism)
  • Rats
  • Xenobiotics (metabolism)

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