title: The metabolism of 7-ethoxycoumarin and 7-hydroxycoumarin by rat and hairless mouse skin strips.
abstract: The metabolism of 7-ethoxycoumarin and 7-hydroxycoumarin was studied in rat and hairless mouse skin strips. These preparations supported de-ethylation, sulphation and glucuronidation reactions. The de-ethylation reaction was inducible in both species by pretreatment with either 5,6-benzoflavone or 3-methylcholanthrene. The hairless mouse strips exhibited a greater basal de-ethylase activity than rat strips, although the latter was the more responsive to inducers. Accompanying the increase in de-ethylation activity was a change in the pattern of metabolites, with a large increase in the percentage of the unconjugated metabolite. When 7-hydroxycoumarin was employed as the primary substrate the glucuronide was the major metabolite formed by strips from both species. The glucuronidation and sulphation activities were unchanged by 3-methylcholanthrene pretreatment.
mesh_terms: D015660:7-Alkoxycoumarin O-Dealkylase; D000818:Animals; D003374:Coumarins / Q000378:metabolism*; D004790:Enzyme Induction / Q000187:drug effects; D066298:In Vitro Techniques; D008297:Male; D051379:Mice; D008812:Mice, Hairless; D010105:Oxygenases / Q000096:biosynthesis; D051381:Rats; D011919:Rats, Inbred Strains; D012867:Skin / Q000378:metabolism*; D013997:Time Factors; D014468:Umbelliferones / Q000378:metabolism*
chemical_list: D003374:Coumarins; D014468:Umbelliferones; C017299:7-ethoxycoumarin; C031477:7-hydroxycoumarin; D010105:Oxygenases; D015660:7-Alkoxycoumarin O-Dealkylase