title: Fusidic Acid Inhibits Hepatic Transporters and Metabolic Enzymes: Potential Cause of Clinical Drug-Drug Interaction Observed with Statin Coadministration.
abstract: Fusidic acid (FA), which was approved in the 1960s in many European and Asian countries, has gained renewed interest due to its continued effectiveness against methicillin-resistant Staphylococcus aureus As rhabdomyolysis has been reported upon coadministration of FA with statins, we aimed to elucidate the underlying molecular mechanisms that contribute to FA-statin drug-drug interactions. Because of the association between rhabdomyolysis and increased exposure to statins, we investigated if cytochrome P450 (CYP) enzymes and transporters involved in the disposition of various statins are inhibited by FA. FA was found to inhibit BCRP and OATP1B1 but not P-gp. In overexpressing cell systems, FA inhibited BCRP-mediated efflux (50% inhibitory concentration [IC50], ∼50 to 110 μM) and OATP1B1-mediated uptake (IC50, ∼4 to 35 μM) of statins at clinically relevant concentrations achievable in the intestine and liver (based on a 550-mg oral dose of FA, the expected maximum theoretical gastrointestinal concentration is ∼4 mM, and the maximum total or unbound concentration in the inlet to the liver was reported to be up to 223 μM or 11 μM, respectively, upon multiple dosing). Similarly, FA inhibited metabolism of statins in human liver microsomes (IC50, ∼17 to 195 μM). These data suggest that FA inhibits at least 3 major dispositional pathways (BCRP, OATP1B1, and CYP3A) and thus affects the clearance of several statins. We confirmed that FA is eliminated via phase 1 metabolism (primarily via CYP3A); however, there is also some phase 2 metabolism (mediated primarily by UGT1A1). Taken together, these data provide evidence for molecular mechanisms that may explain the occurrence of rhabdomyolysis when FA is administered with statins.
authors.affiliation: Drug Metabolism and Pharmacokinetics, Infection Innovative Medicines Unit, AstraZeneca R&D Boston, Waltham, Massachusetts, USA anshul.gupta277@gmail.com.
authors.forename: Anshul
authors.initials: A
authors.lastname: Gupta
authors.affiliation: Drug Metabolism and Pharmacokinetics, Infection Innovative Medicines Unit, AstraZeneca R&D Boston, Waltham, Massachusetts, USA.
authors.forename: Jennifer J
authors.initials: JJ
authors.lastname: Harris
authors.affiliation: AstraZeneca Pharmaceuticals LP, Wilmington, Delaware, USA.
authors.forename: Jianrong
authors.initials: J
authors.lastname: Lin
authors.affiliation: AstraZeneca Pharmaceuticals LP, Wilmington, Delaware, USA.
authors.forename: James P
authors.initials: JP
authors.lastname: Bulgarelli
authors.affiliation: AstraZeneca Pharmaceuticals LP, Wilmington, Delaware, USA.
authors.forename: Bruce K
authors.initials: BK
authors.lastname: Birmingham
authors.affiliation: Drug Metabolism and Pharmacokinetics, Infection Innovative Medicines Unit, AstraZeneca R&D Boston, Waltham, Massachusetts, USA.
authors.forename: Scott W
authors.initials: SW
authors.lastname: Grimm
mesh_terms: D020168:ATP Binding Cassette Transporter, Subfamily B, Member 1 / Q000235:genetics / Q000378:metabolism; D000070997:ATP Binding Cassette Transporter, Subfamily G, Member 2 / Q000037:antagonists & inhibitors / Q000235:genetics / Q000378:metabolism; D000818:Animals; D000900:Anti-Bacterial Agents / Q000494:pharmacology*; D051544:Cytochrome P-450 CYP3A / Q000235:genetics / Q000378:metabolism; D065607:Cytochrome P-450 Enzyme Inhibitors / Q000494:pharmacology*; D004285:Dogs; D004338:Drug Combinations; D004347:Drug Interactions; D005672:Fusidic Acid / Q000494:pharmacology*; D015870:Gene Expression; D057809:HEK293 Cells; D022781:Hepatocytes / Q000187:drug effects* / Q000378:metabolism; D006801:Humans; D019161:Hydroxymethylglutaryl-CoA Reductase Inhibitors / Q000494:pharmacology*; D008658:Inactivation, Metabolic / Q000187:drug effects; D020128:Inhibitory Concentration 50; D027381:Liver-Specific Organic Anion Transporter 1 / Q000037:antagonists & inhibitors / Q000235:genetics / Q000378:metabolism; D061985:Madin Darby Canine Kidney Cells; D008862:Microsomes, Liver / Q000187:drug effects* / Q000378:metabolism; D009363:Neoplasm Proteins / Q000037:antagonists & inhibitors / Q000235:genetics / Q000378:metabolism; D061251:Primary Cell Culture
chemical_list: C116614:ABCG2 protein, human; D020168:ATP Binding Cassette Transporter, Subfamily B, Member 1; D000070997:ATP Binding Cassette Transporter, Subfamily G, Member 2; D000900:Anti-Bacterial Agents; D065607:Cytochrome P-450 Enzyme Inhibitors; D004338:Drug Combinations; D019161:Hydroxymethylglutaryl-CoA Reductase Inhibitors; D027381:Liver-Specific Organic Anion Transporter 1; D009363:Neoplasm Proteins; C503999:SLCO1B1 protein, human; D005672:Fusidic Acid; C104464:CYP3A protein, human; D051544:Cytochrome P-450 CYP3A