title: Biotransformation of cyclosporin in primary rat, porcine and human liver cell co-cultures.
abstract: The purpose of this study was to investigate the species-specific cyclosporin biotransformation in primary rat, human, and porcine liver cell cultures, and to investigate the suitability of a modified sandwich culture technique with non-purified liver cell co-cultures for drug metabolism studies. A sandwich culture was found to enhance hepatocellular metabolic activity and improve cellular morphology and ultrastructure. The cyclosporin metabolites AM9 and AM1 were formed in porcine and human liver cell sandwich co-cultures at levels corresponding to the respective in vivo situations. In contrast, metabolite profiles in rat hepatocytes were at variance with the in vivo situation. However, for all cell types, the overall metabolic activity was positively influenced by sandwich co-culture. The initial levels of albumin synthesis were higher in sandwich cultures than in those without matrix overlay. It is hypothesized that the sandwich culture system provides an improved microenvironment and is, therefore, an advantageous tool for in vitro studies of drug metabolism.
authors.affiliation: Department of Cell Technology and Applied Stem Cell Biology, Biomedical and Biotechnology Centre (BBZ), University of Leipzig, Leipzig, Germany.
authors.forename: E
authors.initials: E
authors.lastname: Schmelzer
authors.forename: A
authors.initials: A
authors.lastname: Acikgoez
authors.forename: N R
authors.initials: NR
authors.lastname: Frühauf
authors.forename: O
authors.initials: O
authors.lastname: Crome
authors.forename: J
authors.initials: J
authors.lastname: Klempnauer
authors.forename: U
authors.initials: U
authors.lastname: Christians
authors.forename: A
authors.initials: A
authors.lastname: Bader
mesh_terms: D000818:Animals; D001711:Biotransformation; D002478:Cells, Cultured; D018920:Coculture Techniques; D016572:Cyclosporine / Q000493:pharmacokinetics*; D022781:Hepatocytes / Q000187:drug effects / Q000378:metabolism*; D006801:Humans; D007328:Insulin / Q000096:biosynthesis; D049528:Insulin, Long-Acting; D061386:Insulin, Regular, Human; D046529:Microscopy, Electron, Transmission; D051381:Rats; D012709:Serum Albumin / Q000096:biosynthesis; D000075462:Serum Albumin, Human; D013552:Swine; D013997:Time Factors
chemical_list: C499251:Albulin; D007328:Insulin; D049528:Insulin, Long-Acting; D061386:Insulin, Regular, Human; D012709:Serum Albumin; D016572:Cyclosporine; D000075462:Serum Albumin, Human