Selective suppressions of human CYP3A forms, CYP3A5 and CYP3A7, by troglitazone in HepG2 cells.
Article Details
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Ogino M, Nagata K, Yamazoe Y
Selective suppressions of human CYP3A forms, CYP3A5 and CYP3A7, by troglitazone in HepG2 cells.
Drug Metab Pharmacokinet. 2002;17(1):42-6.
- PubMed ID
- 15618651 [ View in PubMed]
- Abstract
Troglitazone is an insulin sensitizer and also known as an agonist of peroxisome proliferator-activated receptor-gamma (PPARgamma). In the present study, we have studied the influence of troglitazone on CYP3A form expressions in HepG2 cells for a model of human tissue. Interestingly, constitutively expressed forms of cytochrome P450, CYP3A5 and CYP3A7, were suppressed by the pretreatment of troglitazone but not of the related thiazolidinediones, pioglitazone and rosiglitazone in this cell line. A major liver CYP3A form, CYP3A4, was not detected in this cell line with and without troglitazone treatment. The troglitazone-mediated suppressions of CYP3A5 and CYP3A7 were found to be independent of expression levels of nuclear transcriptional factors, PXR, RXRalpha and PPARgamma. These results suggest that the selectively suppressive effects of troglitazone on CYP3A5 and CYP3A7 expressions may be caused by a novel pathway.
DrugBank Data that Cites this Article
- Drug Enzymes
Drug Enzyme Kind Organism Pharmacological Action Actions Troglitazone Cytochrome P450 3A5 Protein Humans UnknownInhibitorDetails Troglitazone Cytochrome P450 3A7 Protein Humans UnknownInhibitorDetails