title: In vivo and in vitro effects of a new macrolide antibiotic roxithromycin on rat liver cytochrome P-450: comparison with troleandomycin and erythromycin.
abstract: The effects of a new macrolide antibiotic (Roxithromycin) and one of its major metabolite (RU 39001) on rat hepatic drug metabolizing enzymes were compared to those of erythromycin, erythralosamine and troleandomycin (TAO) both in vitro and in vivo. In contrast to erythromycin, erythralosamine and TAO, roxithromycin and its metabolite RU 39001 exhibit: (i) a very poor affinity for rat liver cytochrome P-450, (ii) an unability to be metabolized into a stable inhibitory metabolite-cytochrome P-450 complex and (iii) a decreased ability to induce liver cytochrome P-450 PCNE, an isozyme implicated in drug associations involving some macrolide antibiotics.
authors.affiliation: Laboratoire de Chimie et Biochimie Pharmacologiques et Toxicologiques (UA 400 CNRS), Université René Descartes, Paris, France.
authors.forename: M
authors.initials: M
authors.lastname: Delaforge
authors.forename: E
authors.initials: E
authors.lastname: Sartori
authors.forename: D
authors.initials: D
authors.lastname: Mansuy
mesh_terms: D000818:Animals; D055598:Chemical Phenomena; D002621:Chemistry; D003577:Cytochrome P-450 Enzyme System / Q000378:metabolism*; D004917:Erythromycin / Q000031:analogs & derivatives / Q000378:metabolism / Q000494:pharmacology*; D007933:Leucomycins / Q000378:metabolism / Q000494:pharmacology*; D008099:Liver / Q000187:drug effects / Q000201:enzymology*; D008297:Male; D051381:Rats; D011919:Rats, Inbred Strains; D014217:Troleandomycin / Q000378:metabolism / Q000494:pharmacology*
chemical_list: D007933:Leucomycins; C045512:erythralosamine; D004917:Erythromycin; D003577:Cytochrome P-450 Enzyme System; D014217:Troleandomycin