title: Evaluation of drug-drug interaction potential of beraprost sodium mediated by P450 in vitro.
abstract: Beraprost sodium (BPS), a chemically stable and orally active prostacyclin analogue used for the treatment of chronic occlusive disease and primary pulmonary hypertension, was investigated in terms of its drug-drug interaction mediated by cytochrome P450. In a metabolic enzyme characterization study using P450-expressing insect cell microsomes, beraprost (BP) was slightly metabolized in the presence of CYP2C8, but not metabolized by the other P450 isoforms (CYP1A2, [corrected] CYP2A6, CYP2B6, CYP2C9, CYP2C19, CYP2D6, CYP2E1, CYP3A4, and CYP4A11) at a concentration of 20 microM. These results suggest that none of the P450 isoforms is a major metabolic enzyme of BP. In a P450 induction study using human hepatocytes, BP did not induce any P450 isoform (CYP1A2, CYP2C9, CYP2C19, and CYP3A4) at concentrations of 1-100 microM. Furthermore, in a P450 inhibition study using human liver microsomes, BP did not inhibit any P450 isoform (CYP1A2, CYP2A6, CYP2C8, CYP2C9, CYP2C19, CYP2D6, and CYP3A4) at concentrations of 0.05-1 microM. Therefore it is concluded that BP is not involved in drug-drug interaction mediated by P450 isoforms.
authors.affiliation: Pharmaceutical Research Laboratories, Toray Industries, Inc., Japan. tominaga_fukazawa@nts.toray.co.jp
authors.forename: Tominaga
authors.initials: T
authors.lastname: Fukazawa
authors.forename: Kanako
authors.initials: K
authors.lastname: Yajima
authors.forename: Yohei
authors.initials: Y
authors.lastname: Miyamoto
mesh_terms: D000959:Antihypertensive Agents / Q000494:pharmacology; D001157:Arterial Occlusive Diseases; D002908:Chronic Disease; D003577:Cytochrome P-450 Enzyme System / Q000378:metabolism; D004347:Drug Interactions; D011464:Epoprostenol / Q000031:analogs & derivatives* / Q000494:pharmacology; D006801:Humans; D006976:Hypertension, Pulmonary; D066298:In Vitro Techniques; D007527:Isoenzymes; D008862:Microsomes, Liver / Q000201:enzymology; D010975:Platelet Aggregation Inhibitors / Q000494:pharmacology
chemical_list: D000959:Antihypertensive Agents; D007527:Isoenzymes; D010975:Platelet Aggregation Inhibitors; C048081:beraprost; D003577:Cytochrome P-450 Enzyme System; D011464:Epoprostenol