PMID- 6209866 OWN - NLM STAT- MEDLINE DCOM- 19850103 LR - 20181130 IS - 0049-8254 (Print) IS - 0049-8254 (Linking) VI - 14 IP - 7 DP - 1984 Jul TI - Epoxidation of the lindane metabolite, beta-PCCH, by human- and rat-liver microsomes. PG - 599-604 AB - Human- and rat-liver microsomes convert the lindane metabolite, beta-PCCH (beta-1,3,4,5,6-pentachlorocyclohex-1-ene (3,4,6/5-PCCH] to the metabolites: 1,2,4-TCB (1,2,4-trichlorobenzene), 1,2,3,4-TTCB (1,2,3,4-tetrachlorobenzene), 2,4,5-TCP (2,4,5-trichlorophenol), 3,4,5/6-PCCOL (1,2,4,5,6-pentachlorocyclohex-1-en-3-ol) and beta-PCCH oxide (1,2,3,4,5-pentachloro-7-oxabicyclo[4.1.0]heptane) or (3,4,6/5-PCCH oxide). The identity of the beta-PCCH oxide is confirmed by column chromatography and g.l.c.-mass spectrometry, in comparison to characterized synthetic material. The stability of the beta-PCCH oxide is indicated by its resistance to hydrolysis by microsomal epoxide hydrolase (EC. 3.3.2.3), or various aqueous acid conditions. It shows no mutagenicity using S. typhimurium strain TM677. However, in levels above 0.05 mg/ml it was lethal to the test cells. It is not a substrate for and is only a weak inhibitor of epoxide hydrolase. A stable halogenated hydrocarbon epoxide metabolite is described. Its toxicological role, if any, remains unaccounted for. FAU - Fitzloff, J F AU - Fitzloff JF FAU - Pan, J C AU - Pan JC LA - eng PT - Journal Article PL - England TA - Xenobiotica JT - Xenobiotica; the fate of foreign compounds in biological systems JID - 1306665 RN - 0 (Epoxy Compounds) RN - 0 (Ethers, Cyclic) RN - 28903-24-4 (pentachlorocyclohexene) RN - 59NEE7PCAB (Hexachlorocyclohexane) RN - 93672-46-9 (1,3,4,5,6-pentachlorocyclohexene-1-oxide) SB - IM MH - Animals MH - Chemical Phenomena MH - Chemistry MH - Drug Stability MH - Epoxy Compounds/*metabolism MH - Ethers, Cyclic/*metabolism MH - Hexachlorocyclohexane/*analogs & derivatives/metabolism/toxicity MH - Humans MH - Male MH - Microsomes, Liver/*metabolism MH - Molecular Conformation MH - Mutagenicity Tests MH - Rats MH - Rats, Inbred Strains EDAT- 1984/07/01 00:00 MHDA- 1984/07/01 00:01 CRDT- 1984/07/01 00:00 PHST- 1984/07/01 00:00 [pubmed] PHST- 1984/07/01 00:01 [medline] PHST- 1984/07/01 00:00 [entrez] AID - 10.3109/00498258409151455 [doi] PST - ppublish SO - Xenobiotica. 1984 Jul;14(7):599-604. doi: 10.3109/00498258409151455.