title: Prediction of Drug-Drug Interactions Arising from CYP3A induction Using a Physiologically Based Dynamic Model.
abstract: Using physiologically based pharmacokinetic modeling, we predicted the magnitude of drug-drug interactions (DDIs) for studies with rifampicin and seven CYP3A4 probe substrates administered i.v. (10 studies) or orally (19 studies). The results showed a tendency to underpredict the DDI magnitude when the victim drug was administered orally. Possible sources of inaccuracy were investigated systematically to determine the most appropriate model refinement. When the maximal fold induction (Indmax) for rifampicin was increased (from 8 to 16) in both the liver and the gut, or when the Indmax was increased in the gut but not in liver, there was a decrease in bias and increased precision compared with the base model (Indmax = 8) [geometric mean fold error (GMFE) 2.12 vs. 1.48 and 1.77, respectively]. Induction parameters (mRNA and activity), determined for rifampicin, carbamazepine, phenytoin, and phenobarbital in hepatocytes from four donors, were then used to evaluate use of the refined rifampicin model for calibration. Calibration of mRNA and activity data for other inducers using the refined rifampicin model led to more accurate DDI predictions compared with the initial model (activity GMFE 1.49 vs. 1.68; mRNA GMFE 1.35 vs. 1.46), suggesting that robust in vivo reference values can be used to overcome interdonor and laboratory-to-laboratory variability. Use of uncalibrated data also performed well (GMFE 1.39 and 1.44 for activity and mRNA). As a result of experimental variability (i.e., in donors and protocols), it is prudent to fully characterize in vitro induction with prototypical inducers to give an understanding of how that particular system extrapolates to the in vivo situation when using an uncalibrated approach.
authors.affiliation: Simcyp (a Certara Company), Sheffield, United Kingdom (L.M.A., I.G., O.H., K.R.-Y., M.J., A.R.-H.); DMPK, Genentech Inc., South San Francisco, California (S.M., K.O., S.W., S.T., J.R.K.); and Manchester Pharmacy School, University of Manchester, United Kingdom (A.R.-H.) Lisa.Almond@certara.com.
authors.forename: Lisa M
authors.initials: LM
authors.lastname: Almond
authors.affiliation: Simcyp (a Certara Company), Sheffield, United Kingdom (L.M.A., I.G., O.H., K.R.-Y., M.J., A.R.-H.); DMPK, Genentech Inc., South San Francisco, California (S.M., K.O., S.W., S.T., J.R.K.); and Manchester Pharmacy School, University of Manchester, United Kingdom (A.R.-H.).
authors.forename: Sophie
authors.initials: S
authors.lastname: Mukadam
authors.affiliation: Simcyp (a Certara Company), Sheffield, United Kingdom (L.M.A., I.G., O.H., K.R.-Y., M.J., A.R.-H.); DMPK, Genentech Inc., South San Francisco, California (S.M., K.O., S.W., S.T., J.R.K.); and Manchester Pharmacy School, University of Manchester, United Kingdom (A.R.-H.).
authors.forename: Iain
authors.initials: I
authors.lastname: Gardner
authors.affiliation: Simcyp (a Certara Company), Sheffield, United Kingdom (L.M.A., I.G., O.H., K.R.-Y., M.J., A.R.-H.); DMPK, Genentech Inc., South San Francisco, California (S.M., K.O., S.W., S.T., J.R.K.); and Manchester Pharmacy School, University of Manchester, United Kingdom (A.R.-H.).
authors.forename: Krystle
authors.initials: K
authors.lastname: Okialda
authors.affiliation: Simcyp (a Certara Company), Sheffield, United Kingdom (L.M.A., I.G., O.H., K.R.-Y., M.J., A.R.-H.); DMPK, Genentech Inc., South San Francisco, California (S.M., K.O., S.W., S.T., J.R.K.); and Manchester Pharmacy School, University of Manchester, United Kingdom (A.R.-H.).
authors.forename: Susan
authors.initials: S
authors.lastname: Wong
authors.affiliation: Simcyp (a Certara Company), Sheffield, United Kingdom (L.M.A., I.G., O.H., K.R.-Y., M.J., A.R.-H.); DMPK, Genentech Inc., South San Francisco, California (S.M., K.O., S.W., S.T., J.R.K.); and Manchester Pharmacy School, University of Manchester, United Kingdom (A.R.-H.).
authors.forename: Oliver
authors.initials: O
authors.lastname: Hatley
authors.affiliation: Simcyp (a Certara Company), Sheffield, United Kingdom (L.M.A., I.G., O.H., K.R.-Y., M.J., A.R.-H.); DMPK, Genentech Inc., South San Francisco, California (S.M., K.O., S.W., S.T., J.R.K.); and Manchester Pharmacy School, University of Manchester, United Kingdom (A.R.-H.).
authors.forename: Suzanne
authors.initials: S
authors.lastname: Tay
authors.affiliation: Simcyp (a Certara Company), Sheffield, United Kingdom (L.M.A., I.G., O.H., K.R.-Y., M.J., A.R.-H.); DMPK, Genentech Inc., South San Francisco, California (S.M., K.O., S.W., S.T., J.R.K.); and Manchester Pharmacy School, University of Manchester, United Kingdom (A.R.-H.).
authors.forename: Karen
authors.initials: K
authors.lastname: Rowland-Yeo
authors.affiliation: Simcyp (a Certara Company), Sheffield, United Kingdom (L.M.A., I.G., O.H., K.R.-Y., M.J., A.R.-H.); DMPK, Genentech Inc., South San Francisco, California (S.M., K.O., S.W., S.T., J.R.K.); and Manchester Pharmacy School, University of Manchester, United Kingdom (A.R.-H.).
authors.forename: Masoud
authors.initials: M
authors.lastname: Jamei
authors.affiliation: Simcyp (a Certara Company), Sheffield, United Kingdom (L.M.A., I.G., O.H., K.R.-Y., M.J., A.R.-H.); DMPK, Genentech Inc., South San Francisco, California (S.M., K.O., S.W., S.T., J.R.K.); and Manchester Pharmacy School, University of Manchester, United Kingdom (A.R.-H.).
authors.forename: Amin
authors.initials: A
authors.lastname: Rostami-Hodjegan
authors.affiliation: Simcyp (a Certara Company), Sheffield, United Kingdom (L.M.A., I.G., O.H., K.R.-Y., M.J., A.R.-H.); DMPK, Genentech Inc., South San Francisco, California (S.M., K.O., S.W., S.T., J.R.K.); and Manchester Pharmacy School, University of Manchester, United Kingdom (A.R.-H.).
authors.forename: Jane R
authors.initials: JR
authors.lastname: Kenny
mesh_terms: D000284:Administration, Oral; D002220:Carbamazepine / Q000378:metabolism; D051544:Cytochrome P-450 CYP3A / Q000378:metabolism*; D004347:Drug Interactions / Q000502:physiology*; D004790:Enzyme Induction / Q000502:physiology; D041981:Gastrointestinal Tract / Q000378:metabolism; D022781:Hepatocytes / Q000378:metabolism; D006801:Humans; D008099:Liver / Q000378:metabolism; D008954:Models, Biological; D010634:Phenobarbital / Q000378:metabolism; D010672:Phenytoin / Q000378:metabolism; D012333:RNA, Messenger / Q000378:metabolism; D012293:Rifampin / Q000378:metabolism*
chemical_list: D012333:RNA, Messenger; D002220:Carbamazepine; D010672:Phenytoin; C104464:CYP3A protein, human; D051544:Cytochrome P-450 CYP3A; D012293:Rifampin; D010634:Phenobarbital