2,3,3',4,4'-五塩素化ビフェニル(CB105)のハムスターにおける代謝
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特集号 油症とPCB及び関連化合物研究報告 第19集 責任編集者 古江増隆 / The Nineteenth Reports of the Study on Yusho and PCBs and Related Compounds Guest Editor Masutaka FurueThe in vivo metabolism of 2,3,3',4,4'-pentachlorobiphenyl (CB105) was studied inhamsters and the effect of cytochrome P450 inducers, phenobarbital (PB) and 3-methylcholanthrene(MC) on its metabolism was compared to rats. After administration of CB105 intraperitoneally at a dose of 3 mg/body, four metabolites, named M-1, M-2, M-3 and M-4, were detected in 5 days-feces of all groups and the formation ratio of the metabolites M-1 ～ M-4 was 1 : 39 : 84 : 0.2 in untreated hamsters and 1 : 19 : 6.7 : 0.7 in untreated rats. On the basis of the mass spectra of four synthetic authentic compounds and the retention times on DB-1 and MPS50 columns, M-1, M-2, M-3 and M-4 were identified as 4'-hydroxy-2,3,3',4,5'-PenCB, 5'-hydroxy-CB105, 5-hydroxy-CB105 and 4-hydroxy-2,3,3',4',5-PenCB, respectively. The pretreatment of PB and MC resulted in about 2-fold fecal excretion of four metabolites in hamsters and in about 3-fold in rats. Of four metabolites, only M-4 were detected in the serum at 5 days after CB105administration and the concentration was 0.39 ,ug/ml of hamster serum and 0.28 pg/ml of rat serum. In hamsters, the concentration of M-4 was increased to 1.8-fold of untreated animals by PB treatment and 2.6-fold by MC treatment. On the other hand, the treatment of rats with PB and MC did not show such an increase of serum M-4. These results suggested that the hamster oxidized 2,3,4-trichloro-substituted benzene ring predominantly rather than 3',4'-dichloro-substituted benzene ring differently from the rat and that M-4 formed in hamster liverdistributed to the blood and retained there to a considerable extent in comparison with that formed in rat liver.
- 2003-05-25
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