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Hegde PV, Morse BL. Mechanistic Account of Distinct Change in Organic Anion Transporting Polypeptide 1B (OATP1B) Substrate Pharmacokinetics during OATP1B-Mediated Drug-Drug Interactions Using Physiologically Based Pharmacokinetic Modeling. Drug Metab Dispos 2024; 52:886-898. [PMID: 38740464 DOI: 10.1124/dmd.124.001708] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/28/2024] [Revised: 04/18/2024] [Accepted: 05/10/2024] [Indexed: 05/16/2024] Open
Abstract
The role of transporters in drug clearance is widely acknowledged, directly and indirectly by facilitating tissue/enzyme exposure. Through the latter, transporters also affect volume of distribution. Drug-drug interactions (DDIs) involving organic anion transporting polypeptides (OATPs) 1B1/1B3 and SLCO1B1 pharmacogenetics lead to altered pharmacokinetics of OATP1B substrates; however, several factors may confound direct interpretation of pharmacokinetic parameters from these clinical studies using noncompartmental analysis (NCA). A review of clinical data herein indicates a single dose of OATP1B inhibitor rifampin almost never leads to increased substrate half-life but often a decrease and that most clinical OATP1B substrates are CYP3A4 substrates and/or undergo enterohepatic cycling (EHC). Using hypothetically simple OATP1B substrate physiologically based pharmacokinetic (PBPK) models, simulated effect of rifampin differed from specific OATP1B inhibition due to short rifampin half-life causing dissipation of OATP1B inhibition over time combined with CYP3A4 induction. Calculated using simulated tissue data, volume of distribution indeed decreased with OATP1B inhibition and was expectedly limited to the contribution of liver volume. However, an apparent and counterintuitive effect of rifampin on volume greater than that on clearance resulted for CYP3A4 substrates using NCA. The effect of OATP1B inhibition and rifampin on OATP1B substrate models incorporating EHC plus or minus renal clearance was distinct compared with simpler models. Using PBPK models incorporating reversible lactone metabolism for clinical OATP1B substrates atorvastatin and pitavastatin, DDIs reporting decreased half-life with rifampin were reproduced. These simulations provide an explanation for the distinct change in OATP1B substrate pharmacokinetics observed in clinical studies, including changes in volume of distribution and additional mechanisms. SIGNIFICANCE STATEMENT: Transporters are involved in drug clearance and volume of distribution, and distinct changes in OATP1B substrate pharmacokinetics are observed with OATP1B inhibitor rifampin. Using hypothetical and validated PBPK models and simulations, this study addresses the limitations of single-dose rifampin and complicated clinical OATP1B substrate disposition in evaluating the pharmacokinetic parameters of OATP1B substrates during rifampin drug-drug interactions (DDIs). These models account for change in volume of distribution and identify additional mechanisms underlying apparent pharmacokinetic changes in OATP1B DDIs.
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Affiliation(s)
- Pooja V Hegde
- Lilly Research Laboratories, Eli Lilly and Company, Indianapolis, Indiana
| | - Bridget L Morse
- Lilly Research Laboratories, Eli Lilly and Company, Indianapolis, Indiana
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Di Paolo V, Ferrari FM, Veronese D, Poggesi I, Quintieri L. A genetic algorithm-based approach for the prediction of metabolic drug-drug interactions involving CYP2C8 or CYP2B6. J Pharmacol Toxicol Methods 2024; 127:107516. [PMID: 38777239 DOI: 10.1016/j.vascn.2024.107516] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/29/2024] [Revised: 05/14/2024] [Accepted: 05/16/2024] [Indexed: 05/25/2024]
Abstract
BACKGROUND AND OBJECTIVES A genetic algorithm (GA) approach was developed to predict drug-drug interactions (DDIs) caused by cytochrome P450 2C8 (CYP2C8) inhibition or cytochrome P450 2B6 (CYP2B6) inhibition or induction. Nighty-eight DDIs, obtained from published in vivo studies in healthy volunteers, have been considered using the area under the plasma drug concentration-time curve (AUC) ratios (i.e., ratios of AUC of the drug substrate administered in combination with a DDI perpetrator to AUC of the drug substrate administered alone) to describe the extent of DDI. METHODS The following parameters were estimated in this approach: the contribution ratios (CRCYP2B6 and CRCYP2C8, i.e., the fraction of the dose metabolized via CYP2B6 or CYP2C8, respectively) and the inhibitory or inducing potency of the perpetrator drug (IRCYP2B6, IRCYP2C8 and ICCYP2B6, for inhibition of CYP2B6 and CYP2C8, and induction of CYP2B6, respectively). The workflow consisted of three main phases. First, the initial estimates of the parameters were estimated through GA. Then, the model was validated using an external validation. Finally, the parameter values were refined via a Bayesian orthogonal regression using all data. RESULTS The AUC ratios of 5 substrates, 11 inhibitors and 19 inducers of CYP2B6, and the AUC ratios of 19 substrates and 23 inhibitors of CYP2C8 were successfully predicted by the developed methodology within 50-200% of observed values. CONCLUSIONS The approach proposed in this work may represent a useful tool for evaluating the suitable doses of a CYP2C8 or CYP2B6 substrates co-administered with perpetrators.
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Affiliation(s)
- Veronica Di Paolo
- Laboratory of Drug Metabolism, Department of Pharmaceutical and Pharmacological Sciences, University of Padova, Padova, Italy.
| | | | - Davide Veronese
- Laboratory of Drug Metabolism, Department of Pharmaceutical and Pharmacological Sciences, University of Padova, Padova, Italy
| | - Italo Poggesi
- Clinical Pharmacology, Modeling and Simulation, GlaxoSmithKline S.p.A., Verona, Italy
| | - Luigi Quintieri
- Laboratory of Drug Metabolism, Department of Pharmaceutical and Pharmacological Sciences, University of Padova, Padova, Italy.
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Inhibition of CYP2C8 by Acyl Glucuronides of Gemfibrozil and Clopidogrel: Pharmacological Significance, Progress and Challenges. Biomolecules 2022; 12:biom12091218. [PMID: 36139056 PMCID: PMC9496539 DOI: 10.3390/biom12091218] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/12/2022] [Revised: 08/27/2022] [Accepted: 08/30/2022] [Indexed: 11/24/2022] Open
Abstract
The lipid-regulating drug gemfibrozil is a useful medication for reducing high cholesterol and triglycerides in the blood. In addition to oxidation, it undergoes extensive glucuronidation to produce gemfibrozil acyl glucuronide, which is a known mechanism-based inactivator of cytochrome P450 (CYP) 2C8. Such selective and time-dependent inhibition results in clinically important drug–drug interactions (DDI) with the drugs metabolized by CYP2C8. Similarly, the acyl glucuronide of clopidogrel, a widely used antiplatelet agent, is a potent time-dependent inhibitor of CYP2C8 that demonstrated significant DDI with the substrates of CYP2C8. Current progress in atomic-level understanding mostly involves studying how different drugs bind and undergo oxidation in the active site of CYPs. It is not clear how an acyl glucuronide metabolite of the drug gemfibrozil or clopidogrel interacts in the active site of CYP2C8 and selectively inhibit the enzyme. This mini-review summarizes the current knowledge on some of the important clinical DDI caused by gemfibrozil and clopidogrel due to the inhibition of CYP2C8 by acyl glucuronide metabolites of these drugs. Importantly, it examines recent developments and potential applications of structural biology tools to elucidate the binding and orientation of gemfibrozil acyl glucuronide and clopidogrel acyl glucuronide in the active site near heme that contributes to the inhibition and inactivation of CYP2C8.
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Mochizuki T, Zamek-Gliszczynski MJ, Yoshida K, Mao J, Taskar K, Hirabayashi H, Chu X, Lai Y, Takashima T, Rockich K, Yamaura Y, Fujiwara K, Mizuno T, Maeda K, Furihata K, Sugiyama Y, Kusuhara H. Effect of Cyclosporin A and Impact of Dose Staggering on OATP1B1/1B3 Endogenous Substrates and Drug Probes for Assessing Clinical Drug Interactions. Clin Pharmacol Ther 2022; 111:1315-1323. [PMID: 35292967 PMCID: PMC9325410 DOI: 10.1002/cpt.2584] [Citation(s) in RCA: 13] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/03/2021] [Accepted: 02/28/2022] [Indexed: 12/22/2022]
Abstract
This study was designed to assess the quantitative performance of endogenous biomarkers for organic anion transporting polypeptide (OATP) 1B1/1B3‐mediated drug‐drug interactions (DDIs). Ten healthy volunteers orally received OATP1B1/1B3 probe cocktail (0.2 mg pitavastatin, 1 mg rosuvastatin, and 2 mg valsartan) and an oral dose of cyclosporin A (CysA, 20 mg and 75 mg) separated by a 1‐hour interval (20 mg (−1 hour), and 75 mg (−1 hour)). CysA 75 mg was also given with a 3‐hour interval (75 mg (−3 hours)) to examine the persistence of OATP1B1/1B3 inhibition. The area under the plasma concentration‐time curve ratios (AUCRs) were 1.63, 3.46, and 2.38 (pitavastatin), 1.39, 2.16, and 1.81 (rosuvastatin), and 1.42, 1.77, and 1.85 (valsartan), at 20 mg, 75 mg (−1 hour) and 75 mg (−3 hours) of CysA, respectively. CysA effect on OATP1B1/1B3 was unlikely to persist at the dose examined. Among 26 putative OATP1B1/1B3 biomarkers evaluated, AUCR and maximum concentration ratio (CmaxR) of CP‐I showed the highest Pearson’s correlation coefficient with CysA AUC (0.94 and 0.93, respectively). Correlation between AUCR of pitavastatin, and CmaxR or AUCR of CP‐I were consistent between this study and our previous study using rifampicin as an OATP1B1/1B3 inhibitor. Nonlinear regression analysis of AUCR−1 of pitavastatin and CP‐I against CysA Cmax yielded Ki,OATP1B1/1B3,app (109 ± 35 and 176 ± 42 nM, respectively), similar to the Ki,OATP1B1/1B3 estimated by our physiologically‐based pharmacokinetic model analysis described previously (107 nM). The endogenous OATP1B1/1B3 biomarkers, particularly CmaxR and AUCR of CP‐I, corroborates OATP1B1/1B3 inhibition and yields valuable information that improve accurate DDI predictions in drug development, and enhance our understanding of interindividual variability in the magnitude of DDIs.
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Affiliation(s)
- Tatsuki Mochizuki
- Laboratory of Molecular Pharmacokinetics, Graduate School of Pharmaceutical Sciences, The University of Tokyo, Tokyo, Japan
| | | | - Kenta Yoshida
- Clinical Pharmacology, Genentech, Inc., South San Francisco, California, USA
| | - Jialin Mao
- Drug Metabolism and Pharmacokinetics, Genentech, Inc., South San Francisco, California, USA
| | - Kunal Taskar
- Drug Metabolism and Disposition, GlaxoSmithKline, Stevenage, UK
| | - Hideki Hirabayashi
- Drug Metabolism and Pharmacokinetics Research Laboratories, Research, Takeda Pharmaceutical Company Limited, Kanagawa, Japan
| | | | - Yurong Lai
- Drug Metabolism Department, Gilead Sciences Inc., Foster City, California, USA
| | - Tadayuki Takashima
- Laboratory for Safety Assessment & ADME, Pharmaceuticals Research Center, Asahi Kasei Pharma Corporation, Shizuoka, Japan
| | - Kevin Rockich
- Drug Metabolism, Pharmacokinetics and Clinical Pharmacology, Incyte Research Institute, Wilmington, Delaware, USA
| | - Yoshiyuki Yamaura
- Pharmacokinetic Research Laboratories, Ono Pharmaceutical Co., Ltd, Osaka, Japan
| | - Kaku Fujiwara
- Laboratory of Molecular Pharmacokinetics, Graduate School of Pharmaceutical Sciences, The University of Tokyo, Tokyo, Japan
| | - Tadahaya Mizuno
- Laboratory of Molecular Pharmacokinetics, Graduate School of Pharmaceutical Sciences, The University of Tokyo, Tokyo, Japan
| | - Kazuya Maeda
- Laboratory of Molecular Pharmacokinetics, Graduate School of Pharmaceutical Sciences, The University of Tokyo, Tokyo, Japan
| | | | - Yuichi Sugiyama
- Sugiyama Laboratory, RIKEN Baton Zone Program, RIKEN Cluster for Science, Technology and Innovation Hub, RIKEN, Yokohama, Kanagawa, Japan
| | - Hiroyuki Kusuhara
- Laboratory of Molecular Pharmacokinetics, Graduate School of Pharmaceutical Sciences, The University of Tokyo, Tokyo, Japan
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Takubo H, Bessho K, Watari R, Shigemi R. Quantitative prediction of OATP1B-mediated drug-drug interactions using endogenous biomarker coproporphyrin I. Xenobiotica 2022; 52:397-404. [PMID: 35638858 DOI: 10.1080/00498254.2022.2085210] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Abstract
1. Evaluation of the organic anion transporting polypeptide (OATP) 1B-mediated drug-drug interaction (DDI) potential is important for drug development. The focus of this study was coproporphyrin I (CP-I), an endogenous OATP1B biomarker.2. We investigated a new approach to OATP1B-mediated DDI prediction based on the mechanistic static pharmacokinetics (MSPK) model.3. The ratio of the area under the plasma concentration-time curve (AUCR) with and without co-administration of rifampicin (a typical OATP1B inhibitor) was found for CP-I and OATP1B substrate, respectively, and was then used to derive the correlation curve equation. The AUCR with and without co-administration of another OATP1B inhibitor than rifampicin was then predicted for the OATP1B substrates by substituting the AUCR of CP-I in the correlation curve equation to verify the predictability of the AUCR of the OATP1B substrates.4. The derived correlation curve equation between CP-I and the OATP1B substrates of the AUCRs with and without co-administration of rifampicin matched the observed AUCRs well. Regarding pitavastatin, rosuvastatin and pravastatin, 92.9% of the predicted AUCR values were within a two-fold range of the observed values, indicating that this approach may be a good way to quantitatively predict DDI potential.
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Affiliation(s)
- Hiroaki Takubo
- Japan Pharmaceutical Manufacturers Association.,Torii Pharmaceutical Co., Ltd., Osaka, Japan
| | - Koji Bessho
- Japan Pharmaceutical Manufacturers Association.,Asahi Kasei Pharma Corporation, Shizuoka, Japan
| | - Ryosuke Watari
- Japan Pharmaceutical Manufacturers Association.,Shionogi & Co., Ltd., Osaka, Japan
| | - Ryota Shigemi
- Japan Pharmaceutical Manufacturers Association.,Bayer Yakuhin, Ltd., Osaka, Japan
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Unintentional combining enzalutamide with a moderate CYP2C8 inhibitor in a patient with metastatic castration-resistant prostate cancer: a case report. Cancer Chemother Pharmacol 2022; 89:539-542. [DOI: 10.1007/s00280-021-04379-y] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/20/2021] [Accepted: 11/19/2021] [Indexed: 11/26/2022]
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McCrea JB, Hussain A, Ma B, Garrett GC, Evers R, Laabs JE, Stoch SA, Iwamoto M. Assessment of Pharmacokinetic Interaction Between Gefapixant (MK-7264), a P2X3 Receptor Antagonist, and the OATP1B1 Drug Transporter Substrate Pitavastatin. Clin Pharmacol Drug Dev 2021; 11:406-412. [PMID: 34821075 PMCID: PMC9298894 DOI: 10.1002/cpdd.1047] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/09/2021] [Accepted: 10/10/2021] [Indexed: 12/23/2022]
Abstract
Gefapixant (MK‐7264, AF‐219), a first‐in‐class P2X3 antagonist, is being developed as oral treatment for refractory or unexplained chronic cough. Based on in vitro data, gefapixant exerts inhibitory activity on the organic anion transporter (OAT) P1B1 transporter. Therefore, a drug‐drug interaction study evaluating the potential effects of gefapixant on the OATP1B1 drug transporter, using pitavastatin as a sensitive probe substrate, was conducted. An open‐label, 2‐period, fixed‐sequence study in 20 healthy adults 18 to 55 years old was conducted. In period 1, a 1‐mg oral dose of pitavastatin was administered to each participant. After a ≥4‐day washout, in period 2 participants received a 45‐mg oral dose of gefapixant twice daily on days 1 through 4. On day 2 of period 2, pitavastatin was coadministered with the morning dose of gefapixant. Pitavastatin exposures following single‐dose administration with and without multiple doses of gefapixant were similar: geometric mean ratio (90% confidence interval) of pitavastatin area under the plasma concentration–time curve from time 0 to infinity (AUC0‐∞) (pitavastatin + gefapixant/pitavastatin alone) was 0.97 (0.93‐1.02). The ratio of pitavastatin lactone AUC0‐∞ to pitavastatin AUC0‐∞ was also comparable between treatments. Administration of gefapixant and pitavastatin was generally well tolerated, with no safety findings of concern. These results support that gefapixant has a low potential to inhibit the OATP1B1 transporter.
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Affiliation(s)
| | | | - Bennett Ma
- Merck & Co., Inc., Kenilworth, New Jersey, USA
| | | | - Raymond Evers
- Merck & Co., Inc., Kenilworth, New Jersey, USA.,Johnson & Johnson, Janssen Pharmaceuticals, Springhouse, Pennsylvania, USA
| | - John E Laabs
- Celerion, 2420 W. Baseline Road, Tempe, Arizona, USA
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8
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Ramsden D, Perloff ES, Whitcher-Johnstone A, Ho T, Patel R, Kozminski KD, Fullenwider CL, Zhang JG. Predictive In Vitro-In Vivo Extrapolation for Time Dependent Inhibition of CYP1A2, CYP2C8, CYP2C9, CYP2C19 and CYP2D6 Using Pooled Human Hepatocytes, Human Liver Microsomes, and a Simple Mechanistic Static Model. Drug Metab Dispos 2021; 50:114-127. [PMID: 34789487 DOI: 10.1124/dmd.121.000718] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/07/2021] [Accepted: 11/12/2021] [Indexed: 11/22/2022] Open
Abstract
Inactivation of Cytochrome P450 (CYP450) enzymes can lead to significant increases in exposure of co-medicants. The majority of reported in vitro to in vivo extrapolation (IVIVE) data have historically focused on CYP3A4 leaving the assessment of other CYP isoforms insubstantial. To this end, the utility of human hepatocytes (HHEP) and microsome (HLM) to predict clinically relevant DDIs was investigated with a focus on CYP1A2, CYP2C8, CYP2C9, CYP2C19 and CYP2D6. Evaluation of IVIVE for CYP2B6 was limited to only weak inhibition. A search of the University of Washington Drug-Drug Interaction Database was conducted to identify a clinically relevant weak, moderate and strong inhibitor for selective substrates of CYP1A2, CYP2C8, CYP2C9, CYP2C19 and CYP2D6, resulting in 18 inhibitors for in vitro characterization against 119 clinical interaction studies. Pooled human hepatocytes and HLM were pre-incubated with increasing concentrations of inhibitors for designated timepoints. Time dependent inhibition (TDI) was detected in HLM for four moderate/strong inhibitors suggesting that some optimization of incubation conditions (i.e. lower protein concentrations) is needed to capture weak inhibition. Clinical risk assessment was conducted by incorporating the in vitro derived kinetic parameters kinact and KI into static equations recommended by regulatory authorities. Significant overprediction was observed when applying the basic models recommended by regulatory agencies. Mechanistic static models (MSM), which consider the fraction of metabolism through the impacted enzyme, using the unbound hepatic inlet concentration lead to the best overall prediction accuracy with 92% and 85% of data from HHEPs and HLM, respectively, within 2-fold of the observed value. Significance Statement Collectively, the data demonstrate that coupling time-dependent inactivation parameters derived from pooled human hepatocytes and HLM with a mechanistic static model provides an easy and quantitatively accurate means to determine clinical DDI risk from in vitro data. Weak and moderate inhibitors did not show TDI under standard incubation conditions using HLM and optimization of incubation conditions is warranted. Recommendations are made with respect to input parameters for IVIVE of TDI with non-CYP3A enzymes using available data from HLM and HHEPs.
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Affiliation(s)
| | - Elke S Perloff
- Corning Gentest Contract Research Services, United States
| | | | - Thuy Ho
- Corning Gentest Contract Research Services, United States
| | - Reena Patel
- Corning Gentest Contract Research Services, United States
| | - Kirk D Kozminski
- Global Drug Metabolism and Pharmacokinetics, Takeda Pharmaceuticals Limited, United States
| | | | - J George Zhang
- Corning Gentest Contract Research Services, United States
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Di Paolo V, Ferrari FM, Poggesi I, Quintieri L. A Quantitative Approach to the Prediction of Drug-Drug Interactions Mediated by Cytochrome P450 2C8 Inhibition. Expert Opin Drug Metab Toxicol 2021; 17:1345-1352. [PMID: 34720033 DOI: 10.1080/17425255.2021.1998453] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
Abstract
BACKGROUND Ohno and Colleagues proposed an approach for predicting drug-drug interactions (DDIs) mediated by cytochrome P450 (CYP) 3A4 based on the use of the ratio of the inhibited to non-inhibited area under the plasma concentration time curve (AUC) of substrates to estimate the fraction of the dose metabolized via CYP3A4 (contribution ratio, CR) and the in vivo inhibitory potency of a perpetrator (inhibition ratio, IR). This study evaluated the performance of this approach on DDIs mediated by CYP2C8 inhibitors. RESEARCH DESIGN AND METHODS Initial estimates of CR and IR of CYP2C8 substrates and inhibitors were calculated for 33 DDI in vivo studies. The approach was externally validated with 17 additional studies. Bayesian orthogonal regression was used to refine the estimates of the parameters. Assessment of prediction success was conducted by plotting observed versus predicted AUC ratios. RESULTS Final estimates of CRs and IRs were obtained for 19 CYP2C8 substrates and 23 inhibitors, respectively. The method demonstrated good predictive capacity, with only two values outside of the prespecified limits. CONCLUSIONS The approach may help to adapt dose regimens for CYP2C8 substrates when given in combination with CYP2C8 inhibitors and to map the potential DDIs of new molecular entities.
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Affiliation(s)
- Veronica Di Paolo
- Laboratory of Drug Metabolism, Department of Pharmaceutical and Pharmacological Sciences, University of Padova, Padova, Italy
| | | | - Italo Poggesi
- Department Clinical Pharmacology and Pharmacometrics, Janssen-Cilag S.p.A, Cologno Monzese, Italy
| | - Luigi Quintieri
- Laboratory of Drug Metabolism, Department of Pharmaceutical and Pharmacological Sciences, University of Padova, Padova, Italy
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Ning C, Su S, Li J, Kong D, Cai H, Qin Z, Xing H, Chen X, He J. Evaluation of a Clinically Relevant Drug-Drug Interaction Between Rosuvastatin and Clopidogrel and the Risk of Hepatotoxicity. Front Pharmacol 2021; 12:715577. [PMID: 34646133 PMCID: PMC8504577 DOI: 10.3389/fphar.2021.715577] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/27/2021] [Accepted: 08/06/2021] [Indexed: 11/25/2022] Open
Abstract
Purpose: The combination therapy of rosuvastatin (RSV) and the platelet inhibitor clopidogrel (CP) is widely accepted in the management of cardiovascular diseases. The objective of the present study was to identify the mechanism of RSV–CP DDI and evaluate the risk of hepatotoxicity associated with the concomitant use of CP. Methods: We first studied the effect of CP and its major circulating metabolite, carboxylic acid metabolite (CPC), on RSV transport by overexpressing cells and membrane vesicles. Second, we investigated whether a rat model could replicate this DDI and then be used to conduct mechanistic studies and assess the risk of hepatotoxicity. Then, cytotoxicity assay in hepatocytes, biochemical examination, and histopathology were performed to measure the magnitude of liver injury in the presence and absence of DDI. Results: CP inhibited OATP1B1-mediated transport of RSV with an IC50 value of 27.39 μM. CP and CPC inhibited BCRP-mediated RSV transport with IC50 values of <0.001 and 5.96 μM, respectively. The CP cocktail (0.001 μM CP plus 2 μM CPC) significantly inhibited BCRP-mediated transport of RSV by 26.28%. Multiple p.o. doses of CP significantly increased intravenous RSV plasma AUC0-infinity by 76.29% and decreased intravenous RSV CL by 42.62%. Similarly, multiple p.o. doses of CP significantly increased p.o. RSV plasma AUC0-infinity by 87.48% and decreased p.o. RSV CL by 43.27%. CP had no effect on cell viability, while RSV exhibited dose-dependent cytotoxicity after 96 h incubation. Co-incubation of 100 μM CP and RSV for 96 h significantly increased intracellular concentrations and cell-to-medium concentration ratios of RSV and reduced hepatocyte viability. Histological evaluation of liver specimens showed patterns of drug-induced liver injury. Cholestasis was found in rats in the presence of DDI. Conclusion: CP is not a clinically relevant inhibitor for OATP1B1 and OATP1B3. The primary mechanism of RSV–CP DDI can be attributed to the inhibition of intestinal BCRP by CP combined with the inhibition of hepatic BCRP by CPC. The latter is likely to be more clinically relevant and be a contributing factor for increased hepatotoxicity in the presence of DDI.
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Affiliation(s)
- Chen Ning
- Department of Pharmacy, The Second Affiliated Hospital of Nanchang University, Nanchang, China.,Clinical Pharmacokinetics Laboratory, School of Basic Medicine and Clinical Pharmacy, China Pharmaceutical University, Nanjing, China
| | - Shengdi Su
- Clinical Pharmacokinetics Laboratory, School of Basic Medicine and Clinical Pharmacy, China Pharmaceutical University, Nanjing, China
| | - Jiaming Li
- Clinical Pharmacokinetics Laboratory, School of Basic Medicine and Clinical Pharmacy, China Pharmaceutical University, Nanjing, China
| | - Dexuan Kong
- Clinical Pharmacokinetics Laboratory, School of Basic Medicine and Clinical Pharmacy, China Pharmaceutical University, Nanjing, China
| | - Hui Cai
- Clinical Pharmacokinetics Laboratory, School of Basic Medicine and Clinical Pharmacy, China Pharmaceutical University, Nanjing, China
| | - Zhiying Qin
- Clinical Pharmacokinetics Laboratory, School of Basic Medicine and Clinical Pharmacy, China Pharmaceutical University, Nanjing, China
| | - Han Xing
- Clinical Pharmacokinetics Laboratory, School of Basic Medicine and Clinical Pharmacy, China Pharmaceutical University, Nanjing, China
| | - Xijing Chen
- Clinical Pharmacokinetics Laboratory, School of Basic Medicine and Clinical Pharmacy, China Pharmaceutical University, Nanjing, China
| | - Jiake He
- Department of Pharmacy, The Second Affiliated Hospital of Nanchang University, Nanchang, China.,Clinical Pharmacokinetics Laboratory, School of Basic Medicine and Clinical Pharmacy, China Pharmaceutical University, Nanjing, China.,Department of Cardiovascular Medicine, The Second Affiliated Hospital of Nanchang University, Nanchang, China
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11
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Tornio A, Filppula AM, Backman JT. Translational aspects of cytochrome P450-mediated drug-drug interactions: A case study with clopidogrel. Basic Clin Pharmacol Toxicol 2021; 130 Suppl 1:48-59. [PMID: 34410044 DOI: 10.1111/bcpt.13647] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/24/2021] [Revised: 08/04/2021] [Accepted: 08/16/2021] [Indexed: 12/21/2022]
Abstract
Multimorbidity, polypharmacotherapy and drug interactions are increasingly common in the ageing population. Many drug-drug interactions (DDIs) are caused by perpetrator drugs inhibiting or inducing cytochrome P450 (CYP) enzymes, resulting in alterations of the plasma concentrations of a victim drug. DDIs can have a major negative health impact, and in the past, unrecognized DDIs have resulted in drug withdrawals from the market. Signals to investigate DDIs may emerge from a variety of sources. Nowadays, standard methods are widely available to identify and characterize the mechanisms of CYP-mediated DDIs in vitro. Clinical pharmacokinetic studies, in turn, provide experimental data on pharmacokinetic outcomes of DDIs. Physiologically based pharmacokinetic (PBPK) modelling utilizing both in vitro and in vivo data is a powerful tool to predict different DDI scenarios. Finally, epidemiological studies can provide estimates on the health outcomes of DDIs. Thus, to fully characterize the mechanisms, clinical effects and implications of CYP-mediated DDIs, translational research approaches are required. This minireview provides an overview of translational approaches to study CYP-mediated DDIs, going beyond regulatory DDI guidelines, and an illustrative case study of how the DDI potential of clopidogrel was unveiled by combining these different methods.
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Affiliation(s)
- Aleksi Tornio
- Integrative Physiology and Pharmacology, Institute of Biomedicine, University of Turku, Turku, Finland.,Unit of Clinical Pharmacology, Turku University Hospital, Turku, Finland
| | - Anne M Filppula
- Pharmaceutical Sciences Laboratory, Faculty of Science and Engineering, Åbo Akademi University, Turku, Finland.,Individualized Drug Therapy Research Program, Faculty of Medicine, University of Helsinki, Helsinki, Finland.,Department of Clinical Pharmacology, University of Helsinki and Helsinki University Hospital, Helsinki, Finland
| | - Janne T Backman
- Individualized Drug Therapy Research Program, Faculty of Medicine, University of Helsinki, Helsinki, Finland.,Department of Clinical Pharmacology, University of Helsinki and Helsinki University Hospital, Helsinki, Finland
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Gopaul VS, Vildhede A, Andersson TB, Erlandsson F, Lee CA, Johansson S, Hilgendorf C. In Vitro Assessment of the Drug-Drug Interaction Potential of Verinurad and Its Metabolites as Substrates and Inhibitors of Metabolizing Enzymes and Drug Transporters. J Pharmacol Exp Ther 2021; 378:108-123. [PMID: 34074714 DOI: 10.1124/jpet.121.000549] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/03/2021] [Accepted: 05/24/2021] [Indexed: 12/19/2022] Open
Abstract
Verinurad is a selective uric acid transporter 1 (URAT1) inhibitor in development for the treatment of chronic kidney disease and heart failure. In humans, two major acyl glucuronide metabolites have been identified: direct glucuronide M1 and N-oxide glucuronide M8. Using in vitro systems recommended by regulatory agencies, we evaluated the interactions of verinurad, M1, and M8 with major drug-metabolizing enzymes and transporters and the potential for clinically relevant drug-drug interactions (DDIs). The IC50 for inhibition of CYP2C8, CYP2C9, and CYP3A4/5 for verinurad was ≥14.5 µM, and maximum free plasma concentration (Iu,max)/IC50 was <0.02 at the anticipated therapeutic Cmax and therefore not considered a DDI risk. Verinurad was not an inducer of CYP1A2, CYP2B6, or CYP3A4/5. Verinurad was identified as a substrate of the hepatic uptake transporter organic anion-transporting polypeptide (OATP) 1B3. Since verinurad hepatic uptake involved both active and passive transport, there is a low risk of clinically relevant DDIs with OATP, and further study is warranted. Verinurad was a substrate of the efflux transporters P-glycoprotein (P-gp) and breast cancer resistance protein (BCRP), and renal transporter organic anion transporter 1 (OAT1), although it is not considered a DDI risk in vivo because of dose-proportional pharmacokinetics (P-gp and BCRP) and limited renal excretion of verinurad (OAT1). M1 and M8 were substrates of multidrug resistance-associated protein (MRP) 2 and MRP4 and inhibitors of MRP2. Apart from verinurad being a substrate of OATP1B3 in vitro, the potential for clinically relevant DDIs involving verinurad and its metabolites as victims or perpetrators of metabolizing enzymes or drug transporters is considered low. SIGNIFICANCE STATEMENT: Drug transporters and metabolizing enzymes have an important role in the absorption and disposition of a drug and its metabolites. Using in vitro systems recommended by regulatory agencies, we determined that, apart from verinurad being a substrate of organic anion-transporting polypeptide 1B3, the potential for clinically relevant drug-drug interactions involving verinurad and its metabolites M1 and M8 as victims or perpetrators of metabolizing enzymes or drug transporters is considered low.
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Affiliation(s)
- V Sashi Gopaul
- Early Research and Development Cardiovascular Renal and Metabolism, AstraZeneca Biopharmaceuticals R&D Gothenburg, Mölndal, Sweden (V.S.G, A.V., T.B.A, C.H.); CVRM Late Clinical, AstraZeneca Biopharmaceuticals R&D Gothenburg, Mölndal, Sweden (F.E.); Ardea Biosciences, San Diego, CA, USA (C.A.L.); Clinical Pharmacology & Safety Sciences & AstraZeneca Biopharmaceuticals R&D Gothenburg, Mölndal, Sweden (S.J.)
| | - Anna Vildhede
- Early Research and Development Cardiovascular Renal and Metabolism, AstraZeneca Biopharmaceuticals R&D Gothenburg, Mölndal, Sweden (V.S.G, A.V., T.B.A, C.H.); CVRM Late Clinical, AstraZeneca Biopharmaceuticals R&D Gothenburg, Mölndal, Sweden (F.E.); Ardea Biosciences, San Diego, CA, USA (C.A.L.); Clinical Pharmacology & Safety Sciences & AstraZeneca Biopharmaceuticals R&D Gothenburg, Mölndal, Sweden (S.J.)
| | - Tommy B Andersson
- Early Research and Development Cardiovascular Renal and Metabolism, AstraZeneca Biopharmaceuticals R&D Gothenburg, Mölndal, Sweden (V.S.G, A.V., T.B.A, C.H.); CVRM Late Clinical, AstraZeneca Biopharmaceuticals R&D Gothenburg, Mölndal, Sweden (F.E.); Ardea Biosciences, San Diego, CA, USA (C.A.L.); Clinical Pharmacology & Safety Sciences & AstraZeneca Biopharmaceuticals R&D Gothenburg, Mölndal, Sweden (S.J.)
| | - Fredrik Erlandsson
- Early Research and Development Cardiovascular Renal and Metabolism, AstraZeneca Biopharmaceuticals R&D Gothenburg, Mölndal, Sweden (V.S.G, A.V., T.B.A, C.H.); CVRM Late Clinical, AstraZeneca Biopharmaceuticals R&D Gothenburg, Mölndal, Sweden (F.E.); Ardea Biosciences, San Diego, CA, USA (C.A.L.); Clinical Pharmacology & Safety Sciences & AstraZeneca Biopharmaceuticals R&D Gothenburg, Mölndal, Sweden (S.J.)
| | - Caroline A Lee
- Early Research and Development Cardiovascular Renal and Metabolism, AstraZeneca Biopharmaceuticals R&D Gothenburg, Mölndal, Sweden (V.S.G, A.V., T.B.A, C.H.); CVRM Late Clinical, AstraZeneca Biopharmaceuticals R&D Gothenburg, Mölndal, Sweden (F.E.); Ardea Biosciences, San Diego, CA, USA (C.A.L.); Clinical Pharmacology & Safety Sciences & AstraZeneca Biopharmaceuticals R&D Gothenburg, Mölndal, Sweden (S.J.)
| | - Susanne Johansson
- Early Research and Development Cardiovascular Renal and Metabolism, AstraZeneca Biopharmaceuticals R&D Gothenburg, Mölndal, Sweden (V.S.G, A.V., T.B.A, C.H.); CVRM Late Clinical, AstraZeneca Biopharmaceuticals R&D Gothenburg, Mölndal, Sweden (F.E.); Ardea Biosciences, San Diego, CA, USA (C.A.L.); Clinical Pharmacology & Safety Sciences & AstraZeneca Biopharmaceuticals R&D Gothenburg, Mölndal, Sweden (S.J.)
| | - Constanze Hilgendorf
- Early Research and Development Cardiovascular Renal and Metabolism, AstraZeneca Biopharmaceuticals R&D Gothenburg, Mölndal, Sweden (V.S.G, A.V., T.B.A, C.H.); CVRM Late Clinical, AstraZeneca Biopharmaceuticals R&D Gothenburg, Mölndal, Sweden (F.E.); Ardea Biosciences, San Diego, CA, USA (C.A.L.); Clinical Pharmacology & Safety Sciences & AstraZeneca Biopharmaceuticals R&D Gothenburg, Mölndal, Sweden (S.J.)
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Auxtero MD, Chalante S, Abade MR, Jorge R, Fernandes AI. Potential Herb-Drug Interactions in the Management of Age-Related Cognitive Dysfunction. Pharmaceutics 2021; 13:124. [PMID: 33478035 PMCID: PMC7835864 DOI: 10.3390/pharmaceutics13010124] [Citation(s) in RCA: 10] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/23/2020] [Revised: 01/14/2021] [Accepted: 01/15/2021] [Indexed: 12/25/2022] Open
Abstract
Late-life mild cognitive impairment and dementia represent a significant burden on healthcare systems and a unique challenge to medicine due to the currently limited treatment options. Plant phytochemicals have been considered in alternative, or complementary, prevention and treatment strategies. Herbals are consumed as such, or as food supplements, whose consumption has recently increased. However, these products are not exempt from adverse effects and pharmacological interactions, presenting a special risk in aged, polymedicated individuals. Understanding pharmacokinetic and pharmacodynamic interactions is warranted to avoid undesirable adverse drug reactions, which may result in unwanted side-effects or therapeutic failure. The present study reviews the potential interactions between selected bioactive compounds (170) used by seniors for cognitive enhancement and representative drugs of 10 pharmacotherapeutic classes commonly prescribed to the middle-aged adults, often multimorbid and polymedicated, to anticipate and prevent risks arising from their co-administration. A literature review was conducted to identify mutual targets affected (inhibition/induction/substrate), the frequency of which was taken as a measure of potential interaction. Although a limited number of drugs were studied, from this work, interaction with other drugs affecting the same targets may be anticipated and prevented, constituting a valuable tool for healthcare professionals in clinical practice.
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Affiliation(s)
- Maria D. Auxtero
- CiiEM, Interdisciplinary Research Centre Egas Moniz, Instituto Universitário Egas Moniz, Quinta da Granja, Monte de Caparica, 2829-511 Caparica, Portugal; (M.D.A.); (S.C.); (M.R.A.); (R.J.)
| | - Susana Chalante
- CiiEM, Interdisciplinary Research Centre Egas Moniz, Instituto Universitário Egas Moniz, Quinta da Granja, Monte de Caparica, 2829-511 Caparica, Portugal; (M.D.A.); (S.C.); (M.R.A.); (R.J.)
| | - Mário R. Abade
- CiiEM, Interdisciplinary Research Centre Egas Moniz, Instituto Universitário Egas Moniz, Quinta da Granja, Monte de Caparica, 2829-511 Caparica, Portugal; (M.D.A.); (S.C.); (M.R.A.); (R.J.)
| | - Rui Jorge
- CiiEM, Interdisciplinary Research Centre Egas Moniz, Instituto Universitário Egas Moniz, Quinta da Granja, Monte de Caparica, 2829-511 Caparica, Portugal; (M.D.A.); (S.C.); (M.R.A.); (R.J.)
- Polytechnic Institute of Santarém, School of Agriculture, Quinta do Galinheiro, 2001-904 Santarém, Portugal
- CIEQV, Life Quality Research Centre, IPSantarém/IPLeiria, Avenida Dr. Mário Soares, 110, 2040-413 Rio Maior, Portugal
| | - Ana I. Fernandes
- CiiEM, Interdisciplinary Research Centre Egas Moniz, Instituto Universitário Egas Moniz, Quinta da Granja, Monte de Caparica, 2829-511 Caparica, Portugal; (M.D.A.); (S.C.); (M.R.A.); (R.J.)
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14
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Statins, toxicity, and their adverse effects via oxidative imbalance. Toxicology 2021. [DOI: 10.1016/b978-0-12-819092-0.00026-1] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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15
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Lee CH, Franchi F, Angiolillo DJ. Clopidogrel drug interactions: a review of the evidence and clinical implications. Expert Opin Drug Metab Toxicol 2020; 16:1079-1096. [PMID: 32835535 DOI: 10.1080/17425255.2020.1814254] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
Abstract
INTRODUCTION Patients with cardiovascular disease are commonly affected by a number of comorbidities leading to a high prevalence of polypharmacy. Polypharmacy increases the probability of drug-drug interactions (DDIs). Amongst these, DDIs involving clopidogrel, the most commonly utilized platelet P2Y12 inhibitor, is a topic of potential clinical concern. AREAS COVERED This article reviews DDIs between clopidogrel and drugs which are widely used in clinical practice. In particular, drugs shown to interfere with the pharmacodynamic and pharmacokinetic effects of clopidogrel and the clinical implications of these findings are reviewed. These drugs include inhibitors of gastric acid secretion, statins, calcium channel blockers, antidiabetic agents, and antimicrobial agents. For the references, we searched PubMed, EMBASE, or the Cochrane Library. EXPERT OPINION Clopidogrel-drug interactions are common. Most of these DDIs are limited to laboratory findings showing an impact on clopidogrel-induced antiplatelet effects. While variability in clopidogrel-induced antiplatelet effects is known to affect clinical outcomes, with high platelet reactivity being associated with thrombotic complications among patients undergoing coronary stenting, most studies assessing the clinical implications of clopidogrel-drug interactions have not shown to significantly affect outcomes. However, awareness of these DDIs remains important for optimizing the selection of concomitant therapies.
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Affiliation(s)
- Chang Hoon Lee
- Division of Cardiology, University of Florida College of Medicine-Jacksonville , Jacksonville, FL, USA.,Division of Cardiology, Department of Internal Medicine, Veterans Health Service Medical Center , Seoul, Korea
| | - Francesco Franchi
- Division of Cardiology, University of Florida College of Medicine-Jacksonville , Jacksonville, FL, USA
| | - Dominick J Angiolillo
- Division of Cardiology, University of Florida College of Medicine-Jacksonville , Jacksonville, FL, USA
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Axelsen LN, Poggesi I, Rasschaert F, Perez Ruixo JJ, Bruderer S. Clopidogrel, a CYP2C8 inhibitor, causes a clinically relevant increase in the systemic exposure to the active metabolite of selexipag in healthy subjects. Br J Clin Pharmacol 2020; 87:119-128. [PMID: 32415684 PMCID: PMC9328278 DOI: 10.1111/bcp.14365] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/12/2019] [Revised: 04/21/2020] [Accepted: 05/05/2020] [Indexed: 12/19/2022] Open
Abstract
Aims Selexipag is a prostacyclin receptor agonist approved for the treatment of pulmonary arterial hypertension. Cytochrome P450 (CYP) 2C8 is involved in the metabolism of selexipag and its active metabolite, ACT‐333679. This study evaluated the interaction of selexipag and clopidogrel, a CYP2C8 inhibitor. Methods The study had a 2‐treatment, 1‐sequence, crossover design. Pharmacokinetics (PK) and CYP2C8 genotype were assessed in healthy male subjects administered selexipag (200 μg twice daily [b.i.d.]) alone or with clopidogrel (300 mg single dose or 75 mg once daily [o.d.]). PK modelling and simulation were conducted to support dosing recommendations. Results Clopidogrel had a comparatively small effect on selexipag (<1.5‐fold difference in any PK variable). For ACT‐333679, the major contributor to the drug effect, the area under the plasma concentration–time curve during a dose interval and the maximum plasma concentration increased 2.25‐fold (90% confidence interval [CI] 2.06, 2.46) and 1.69‐fold (90% CI 1.55, 1.84), respectively with clopidogrel 300 mg and 2.70‐fold (90% CI 2.45, 2.96) and 1.90‐fold (90% CI 1.72, 2.11), respectively with clopidogrel 75 mg. The effect of clopidogrel on selexipag and ACT‐333679 exposure was comparable for all identified CYP2C8 genotypes. PK simulations predicted comparable exposure to ACT‐333679 following selexipag 400 μg b.i.d., 400 μg o.d. in combination with clopidogrel 75 mg o.d and 200 μg b.i.d. with clopidogrel 75 mg o.d. Conclusion Results suggest that ACT‐333679 exposure can be maintained within the therapeutic range by reducing selexipag dosing frequency to o.d. or dose to half, when selexipag is coadministered with clopidogrel.
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Affiliation(s)
- Lene Nygaard Axelsen
- Department of Clinical PharmacologyActelion Pharmaceuticals LtdAllschwilSwitzerland
| | - Italo Poggesi
- Department of Clinical PharmacologyActelion Pharmaceuticals LtdAllschwilSwitzerland
| | - Freya Rasschaert
- Clinical Pharmacology UnitJanssen Pharmaceutica NVMerksemBelgium
| | | | - Shirin Bruderer
- Department of Clinical PharmacologyActelion Pharmaceuticals LtdAllschwilSwitzerland
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17
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McFeely SJ, Ritchie TK, Yu J, Nordmark A, Berglund EG, Levy RH, Ragueneau‐Majlessi I. Inhibitors of Organic Anion‐Transporting Polypeptides 1B1 and 1B3: Clinical Relevance and Regulatory Perspective. J Clin Pharmacol 2020; 60:1087-1098. [DOI: 10.1002/jcph.1604] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/04/2019] [Accepted: 02/11/2020] [Indexed: 12/22/2022]
Affiliation(s)
| | - Tasha K. Ritchie
- University of Washington Drug Interaction Solutions Seattle Washington USA
| | - Jingjing Yu
- University of Washington Drug Interaction Solutions Seattle Washington USA
| | | | - Eva Gil Berglund
- Certara Strategic ConsultingIntegrated Drug Development Oss The Netherlands
| | - Rene H. Levy
- University of Washington Drug Interaction Solutions Seattle Washington USA
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Akagi Y, Iketaki A, Kimura H, Matsudaira Y, Yoshida T, Nishimura T, Kawano Y, Mano Y, Shigematsu E, Ujihara M. Risk of hypoglycemia associated with repaglinide combined with clopidogrel, a retrospective cohort study. J Pharm Health Care Sci 2020; 6:5. [PMID: 32206324 PMCID: PMC7081567 DOI: 10.1186/s40780-020-00159-7] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/30/2019] [Accepted: 03/03/2020] [Indexed: 12/31/2022] Open
Abstract
Background Repaglinide is widely prescribed to reduce postprandial hyperglycemia and elevated glycated hemoglobin (HbA1c) levels associated with type 2 diabetes, and clopidogrel is a thienopyridine antiplatelet agent and widely used in cardiovascular and cerebrovascular diseases. It has been suggested that the concomitant use of repaglinide with clopidogrel may inhibit repaglinide metabolism, because repaglinide is a substrate of cytochrome P450 2C8 (CYP2C8) and the main metabolite of clopidogrel acyl-β-D-glucuronide inhibits CYP2C8 activity. In this study, we retrospectively investigated the effect of clopidogrel with repaglinide on plasma glucose and the risk of hypoglycemia associated with the combination of both drugs. Method Patients were taking clopidogrel (75 mg/day) and started taking glinide (1.5 mg/day repaglinide or 30 mg/day mitiglinide) for the first time from April 2012 to March 2017. We targeted subjects who were hospitalized at the start of glinide and whose preprandial plasma glucose was measured by a nurse. The glucose levels were collected for up to 5 days before and after the glinide start date. Results Average fasting plasma glucose levels (before breakfast) in the repaglinide and clopidogrel group before and after starting repaglinide were 180.1±35.5 and 136.5 ± 44.1 mg/dL, with a mean decrease of 43.6 ± 33.6 mg/dL. In contrast, there was only a moderate decrease of 11.6 ± 30.0 mg/dL in the mitiglinide and clopidogrel group. Minimum plasma glucose levels in the repaglinide and clopidogrel group before and after starting repaglinide were 145.2 ± 42.9 and 93.3 ± 36.3 mg/dL, respectively. Decrease in minimum levels after starting glinide in the repaglinide and clopidogrel group (51.9 ± 47.5 mg/dL) was more significant than those in the mitiglinide and clopidogrel group (only 2.1 ± 29.1 mg/dL), and the repaglinide group (without clopidogrel, 15.5 ± 20.0 mg/dL). Hypoglycemia was observed in 6 of 15 patients in the repaglinide and clopidogrel group, but only 1 of 15 patients in the mitiglinide and clopidogrel group, and no patients in the repaglinide group. Conclusion These findings indicate that minimum plasma glucose levels were significantly decreased in patients taking repaglinide and clopidogrel. Considering the risk of hypoglycemia associated with taking repaglinide and clopidogrel, when a glinide is required in patients taking clopidogrel, mitiglinide may be a better choice.
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Affiliation(s)
- Yuuki Akagi
- Department of Pharmacy, National Hospital Organization Yokohama Medical Center, 3-60-2 Harajuku, Totsuka, Yokohama, Kanagawa 245-8575 Japan
| | - Akiko Iketaki
- Department of Pharmacy, National Hospital Organization Yokohama Medical Center, 3-60-2 Harajuku, Totsuka, Yokohama, Kanagawa 245-8575 Japan
| | - Haruna Kimura
- Department of Pharmacy, National Hospital Organization Yokohama Medical Center, 3-60-2 Harajuku, Totsuka, Yokohama, Kanagawa 245-8575 Japan
| | - Yuki Matsudaira
- Department of Pharmacy, National Hospital Organization Yokohama Medical Center, 3-60-2 Harajuku, Totsuka, Yokohama, Kanagawa 245-8575 Japan
| | - Takami Yoshida
- Department of Pharmacy, National Hospital Organization Yokohama Medical Center, 3-60-2 Harajuku, Totsuka, Yokohama, Kanagawa 245-8575 Japan
| | - Takahiro Nishimura
- 2Department of Pharmacy, National Cancer Center Hospital East, 6-5-1 Kashiwanoha, Kashiwa, Chiba, 277-8577 Japan
| | - Yohei Kawano
- 3Faculty of Pharmaceutical Sciences, Tokyo University of Science, 2641 Yamazaki, Noda, Chiba, 278-8510 Japan
| | - Yasunari Mano
- 3Faculty of Pharmaceutical Sciences, Tokyo University of Science, 2641 Yamazaki, Noda, Chiba, 278-8510 Japan
| | - Erina Shigematsu
- Department of Clinical Laboratory, National Hospital Organization Yokohama Medical Center, 3-60-2 Harajuku, Totsuka, Yokohama, Kanagawa 245-8575 Japan.,Department of Diabetes Endocrinology, National Hospital Organization Yokohama Medical Center, 3-60-2 Harajuku, Totsuka, Yokohama, Kanagawa 245-8575 Japan
| | - Makoto Ujihara
- Department of Diabetes Endocrinology, National Hospital Organization Yokohama Medical Center, 3-60-2 Harajuku, Totsuka, Yokohama, Kanagawa 245-8575 Japan
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Pharmacokinetics and pharmacodynamics analysis of XQ-1H and its combination therapy with clopidogrel on cerebral ischemic reperfusion injury in rats. J Pharm Biomed Anal 2020; 179:112975. [PMID: 31735472 DOI: 10.1016/j.jpba.2019.112975] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/08/2019] [Revised: 10/11/2019] [Accepted: 11/04/2019] [Indexed: 11/21/2022]
Abstract
Ischemic stroke is the main cause of disability and mortality worldwide. 10-O-(N N-dimethylaminoethyl)-ginkgolide B methane-sulfonate (XQ-1 H) is a novel drug based on the remedial approach for ischemic stroke. Clopidogrel, a widely used anti-platelet drug, is often co-prescribed in the clinic. In this study, we established an UPLC-MS/MS spectrometry method for the determination of XQ-1H and investigated the pharmacokinetic effect of clopidogrel on XQ-1H in rats subjected to middle cerebral artery occlusion (MCAO). Meanwhile, the anti-apoptotic and neuroprotective effects of XQ-1H and its combination with clopidogrel were also studied. The results revealed that XQ-1H and its combination with clopidogrel abridged brain infarct volume, cerebral edema and alleviated neurological dysfunction caused by cerebral ischemic reperfusion injury. Further study demonstrated that XQ-1H combined with clopidogrel lessened TUNEL positive cells, up-regulated bcl-2 expression notably and down-regulated bax expression as compared to both XQ-1H and clopidogrel individually. In addition, a rapid, sensitive UPLC-MS/MS method was developed to quantify the concentration of XQ-1H in MCAO/R rats. Our pharmacokinetic results showed that clopidogrel significantly increased the exposure of XQ-1H, increased the peak plasma concentration (Cmax), area under the curve (AUC) and slowed elimination of XQ-1H in the co-administered group. Besides, for further exploring which CYP450 isoforms are involved in the XQ-1H metabolism, XQ-1H was incubated in human liver microsomes (HLMs) system with or without P450 isoform-selective inhibitors. Our results revealed that clopidogrel altered pharmacokinetics of XQ-1H potentially and subsequently enhanced the pharmacological effect of XQ-1H. Moreover, XQ-1H could be applied as an efficacious neuroprotective agent for ischemic stroke because of its considerable effect on averting neuronal apoptosis.
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Tod M, Bourguignon L, Bleyzac N, Goutelle S. Quantitative Prediction of Interactions Mediated by Transporters and Cytochromes: Application to Organic Anion Transporting Polypeptides, Breast Cancer Resistance Protein and Cytochrome 2C8. Clin Pharmacokinet 2019; 59:757-770. [DOI: 10.1007/s40262-019-00853-2] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
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Iwaki Y, Lee W, Sugiyama Y. Comparative and quantitative assessment on statin efficacy and safety: insights into inter-statin and inter-individual variability via dose- and exposure-response relationships. Expert Opin Drug Metab Toxicol 2019; 15:897-911. [PMID: 31648563 DOI: 10.1080/17425255.2019.1681399] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/28/2022]
Abstract
Introduction: Statins are prescribed widely for cholesterol-lowering therapy, but it is known that their efficacy and safety profiles vary, despite the shared pharmacophore and pharmacological target. The immense body of related clinical and preclinical data offers a unique opportunity to explore the possible factors underlying inter-statin and inter-individual variabilities.Area covered: Clinical and preclinical data from various statins were compiled with regard to the efficacy (cholesterol-lowering effect) and safety (muscle toxicity). Based on the compiled data, dose- and exposure-response relationships were explored to obtain mechanistic and quantitative insights into the variations in the efficacy and safety profiles of statins.Expert opinion: Our analyses indicated that the inter-statin variability in the cholesterol-lowering effect may be mainly attributable to variations in potency of inhibition of the pharmacological target, rather than variations in drug exposure at the site of drug action. However, the drug exposure at the sites of drug action (i.e., the liver for efficacy and the muscle for safety) may contribute to the differences in the efficacy and safety observed in individual patients.
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Affiliation(s)
- Yuki Iwaki
- Clinical Pharmacology, Janssen Pharmaceutical K.K., Tokyo, Japan
| | - Wooin Lee
- College of Pharmacy and Research Institute of Pharmaceutical Sciences, Seoul National University, Seoul, Republic of Korea
| | - Yuichi Sugiyama
- Sugiyama Laboratory, RIKEN Baton Zone Program, RIKEN Cluster for Science, Technology and Innovation Hub, RIKEN, Yokohama, Kanagawa, Japan
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22
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Asaumi R, Menzel K, Lee W, Nunoya KI, Imawaka H, Kusuhara H, Sugiyama Y. Expanded Physiologically-Based Pharmacokinetic Model of Rifampicin for Predicting Interactions With Drugs and an Endogenous Biomarker via Complex Mechanisms Including Organic Anion Transporting Polypeptide 1B Induction. CPT-PHARMACOMETRICS & SYSTEMS PHARMACOLOGY 2019; 8:845-857. [PMID: 31420941 PMCID: PMC6875706 DOI: 10.1002/psp4.12457] [Citation(s) in RCA: 25] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 03/26/2019] [Accepted: 07/08/2019] [Indexed: 02/01/2023]
Abstract
As rifampicin can cause the induction and inhibition of multiple metabolizing enzymes and transporters, it has been challenging to accurately predict the complex drug–drug interactions (DDIs). We previously constructed a physiologically‐based pharmacokinetic (PBPK) model of rifampicin accounting for the components for the induction of cytochrome P450 (CYP) 3A/CYP2C9 and the inhibition of organic anion transporting polypeptide 1B (OATP1B). This study aimed to expand and verify the PBPK model for rifampicin by incorporating additional components for the induction of OATP1B and CYP2C8 and the inhibition of multidrug resistance protein 2. The established PBPK model was capable of accurately predicting complex rifampicin‐induced alterations in the profiles of glibenclamide, repaglinide, and coproporphyrin I (an endogenous biomarker of OATP1B activities) with various dosing regimens. Our comprehensive rifampicin PBPK model may enable quantitative prediction of DDIs across diverse potential victim drugs and endogenous biomarkers handled by multiple metabolizing enzymes and transporters.
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Affiliation(s)
- Ryuta Asaumi
- Pharmacokinetic Research Laboratories, Ono Pharmaceutical Co., Ltd., Tsukuba, Japan
| | | | - Wooin Lee
- College of Pharmacy and Research Institute of Pharmaceutical Sciences, Seoul National University, Seoul, Korea
| | - Ken-Ichi Nunoya
- Pharmacokinetic Research Laboratories, Ono Pharmaceutical Co., Ltd., Tsukuba, Japan
| | - Haruo Imawaka
- Pharmacokinetic Research Laboratories, Ono Pharmaceutical Co., Ltd., Tsukuba, Japan
| | - Hiroyuki Kusuhara
- Laboratory of Molecular Pharmacokinetics, Graduate School of Pharmaceutical Sciences, The University of Tokyo, Tokyo, Japan
| | - Yuichi Sugiyama
- Sugiyama Laboratory, RIKEN Baton Zone Program, RIKEN Cluster for Science, Technology and Innovation Hub, RIKEN, Yokohama, Japan
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Varma MV, Bi Y, Lazzaro S, West M. Clopidogrel as a Perpetrator of Drug–Drug Interactions: A Challenge for Quantitative Predictions? Clin Pharmacol Ther 2019; 105:1295-1299. [DOI: 10.1002/cpt.1398] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/13/2018] [Accepted: 02/08/2019] [Indexed: 12/11/2022]
Affiliation(s)
- Manthena V.S. Varma
- Pharmacokinetics, Dynamics, and MetabolismMedicine DesignWorldwide R&D, Pfizer, Inc. Groton Connecticut USA
| | - Yi‐an Bi
- Pharmacokinetics, Dynamics, and MetabolismMedicine DesignWorldwide R&D, Pfizer, Inc. Groton Connecticut USA
| | - Sarah Lazzaro
- Pharmacokinetics, Dynamics, and MetabolismMedicine DesignWorldwide R&D, Pfizer, Inc. Groton Connecticut USA
| | - Mark West
- Pharmacokinetics, Dynamics, and MetabolismMedicine DesignWorldwide R&D, Pfizer, Inc. Groton Connecticut USA
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25
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Mori D, Kashihara Y, Yoshikado T, Kimura M, Hirota T, Matsuki S, Maeda K, Irie S, Ieiri I, Sugiyama Y, Kusuhara H. Effect of OATP1B1 genotypes on plasma concentrations of endogenous OATP1B1 substrates and drugs, and their association in healthy volunteers. Drug Metab Pharmacokinet 2019; 34:78-86. [DOI: 10.1016/j.dmpk.2018.09.003] [Citation(s) in RCA: 31] [Impact Index Per Article: 6.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/09/2018] [Revised: 08/01/2018] [Accepted: 09/05/2018] [Indexed: 02/08/2023]
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26
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Itkonen MK, Tornio A, Neuvonen M, Neuvonen PJ, Niemi M, Backman JT. Clopidogrel and Gemfibrozil Strongly Inhibit the CYP2C8-Dependent Formation of 3-Hydroxydesloratadine and Increase Desloratadine Exposure In Humans. Drug Metab Dispos 2019; 47:377-385. [DOI: 10.1124/dmd.118.084665] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/26/2018] [Accepted: 01/07/2019] [Indexed: 12/16/2022] Open
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27
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Patilea-Vrana GI, Unadkat JD. When Does the Rate-Determining Step in the Hepatic Clearance of a Drug Switch from Sinusoidal Uptake to All Hepatobiliary Clearances? Implications for Predicting Drug-Drug Interactions. Drug Metab Dispos 2018; 46:1487-1496. [PMID: 30115647 PMCID: PMC6193213 DOI: 10.1124/dmd.118.081307] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/07/2018] [Accepted: 08/10/2018] [Indexed: 12/24/2022] Open
Abstract
For dual transporter-enzyme substrate drugs, the extended clearance model can be used to predict the rate-determining step(s) (RDS) of a drug and hence predict its drug-drug interaction (DDI) liabilities (i.e., transport, metabolism, or both). If the RDS of the hepatic clearance of the drug is sinusoidal uptake clearance (CLs in), even if the drug is eliminated mainly by hepatic metabolism, its DDI liability (as viewed from changes to systemic drug concentrations) is expected to be inhibition or induction of uptake transporters but not hepatic enzymes; however, this is true only if the condition required to maintain CLs in as the RDS is maintained. Here, we illustrate through theoretical simulations that the RDS condition may be violated in the presence of a DDI. That is, the RDS of a drug can switch from CLs in to all hepatobiliary clearances [i.e., metabolic/biliary clearance (CLmet + bile) and CLs in], leading to unexpected systemic DDIs, such as metabolic DDIs, when only transporter DDIs were anticipated. As expected, these analyses revealed that the RDS switch depends on the ratio of CLmet + bile to sinusoidal efflux clearance (CLs ef). Additional analyses revealed that for intravenously administered drugs, the RDS switch also depends on the magnitude of CLs in We analyzed published in vitro quantified hepatobiliary clearances and observed that most drugs have a CLmet + bile/CLs ef ratio < 4; hence, in practice, the magnitude of CLs in must be considered when establishing the RDS. These analyses provide insights previously not appreciated and a theoretical framework to predict DDI liabilities for drugs that are dual transporter-enzyme substrates.
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Affiliation(s)
| | - Jashvant D Unadkat
- Department of Pharmaceutics, University of Washington, Seattle, Washington
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28
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Tan ML, Zhao P, Zhang L, Ho YF, Varma MVS, Neuhoff S, Nolin TD, Galetin A, Huang SM. Use of Physiologically Based Pharmacokinetic Modeling to Evaluate the Effect of Chronic Kidney Disease on the Disposition of Hepatic CYP2C8 and OATP1B Drug Substrates. Clin Pharmacol Ther 2018; 105:719-729. [PMID: 30074626 PMCID: PMC8246729 DOI: 10.1002/cpt.1205] [Citation(s) in RCA: 50] [Impact Index Per Article: 8.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/05/2018] [Accepted: 07/30/2018] [Indexed: 12/15/2022]
Abstract
Chronic kidney disease (CKD) differentially affects the pharmacokinetics (PK) of nonrenally cleared drugs via certain pathways (e.g., cytochrome P450 (CYP)2D6); however, the effect on CYP2C8‐mediated clearance is not well understood because of overlapping substrate specificity with hepatic organic anion‐transporting polypeptides (OATPs). This study used physiologically based pharmacokinetic (PBPK) modeling to delineate potential changes in CYP2C8 or OATP1B activity in patients with CKD. Drugs analyzed are predominantly substrates of CYP2C8 (rosiglitazone and pioglitazone), OATP1B (pitavastatin), or both (repaglinide). Following initial model verification, pharmacokinetics (PK) of these drugs were simulated in patients with severe CKD considering changes in glomerular filtration rate (GFR), plasma protein binding, and activity of either CYP2C8 and/or OATP1B in a stepwise manner. The PBPK analysis suggests that OATP1B activity could be decreased up to 60% in severe CKD, whereas changes to CYP2C8 are negligible. This improved understanding of CKD effect on clearance pathways could be important to inform the optimal use of nonrenally eliminated drugs in patients with CKD.
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Affiliation(s)
- Ming-Liang Tan
- Office of Clinical Pharmacology, Office of Translational Sciences, Center for Drug Evaluation and Research, US Food and Drug Administration, Silver Spring, Maryland, USA
| | - Ping Zhao
- Office of Clinical Pharmacology, Office of Translational Sciences, Center for Drug Evaluation and Research, US Food and Drug Administration, Silver Spring, Maryland, USA.,Quantitative Sciences, Global Health-Integrated Development, Bill and Melinda Gates Foundation, Seattle, Washington, USA
| | - Lei Zhang
- Office of Clinical Pharmacology, Office of Translational Sciences, Center for Drug Evaluation and Research, US Food and Drug Administration, Silver Spring, Maryland, USA.,Office of Research and Standards, Office of Generic Drugs, Center for Drug Evaluation and Research, US Food and Drug Administration, Silver Spring, Maryland, USA
| | - Yunn-Fang Ho
- Graduate Institute of Clinical Pharmacy, College of Medicine, National Taiwan University, Taipei, Taiwan
| | - Manthena V S Varma
- Pharmacokinetics, Pharmacodynamics & Metabolism Department-New Chemical Entities, Pfizer Inc., Groton, Connecticut, USA
| | | | - Thomas D Nolin
- Center for Clinical Pharmaceutical Sciences, Department of Pharmacy and Therapeutics, and Department of Medicine Renal-Electrolyte Division, Schools of Pharmacy and Medicine, University of Pittsburgh, Pittsburgh, Pennsylvania, USA
| | - Aleksandra Galetin
- Centre for Applied Pharmacokinetic Research, School of Heath Sciences, University of Manchester, Manchester, UK
| | - Shiew-Mei Huang
- Office of Clinical Pharmacology, Office of Translational Sciences, Center for Drug Evaluation and Research, US Food and Drug Administration, Silver Spring, Maryland, USA
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29
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Chu X, Liao M, Shen H, Yoshida K, Zur AA, Arya V, Galetin A, Giacomini KM, Hanna I, Kusuhara H, Lai Y, Rodrigues D, Sugiyama Y, Zamek-Gliszczynski MJ, Zhang L. Clinical Probes and Endogenous Biomarkers as Substrates for Transporter Drug-Drug Interaction Evaluation: Perspectives From the International Transporter Consortium. Clin Pharmacol Ther 2018; 104:836-864. [DOI: 10.1002/cpt.1216] [Citation(s) in RCA: 105] [Impact Index Per Article: 17.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/31/2018] [Accepted: 08/01/2018] [Indexed: 02/06/2023]
Affiliation(s)
- Xiaoyan Chu
- Department of Pharmacokinetics, Pharmacodynamics and Drug Metabolism; Merck & Co., Inc; Kenilworth New Jersey USA
| | - Mingxiang Liao
- Department of Clinical Pharmacology; Clovis Oncology, Inc.; Boulder Colorado USA
| | - Hong Shen
- Department of Metabolism and Pharmacokinetics; Bristol-Myers Squibb; Princeton New Jersey USA
| | - Kenta Yoshida
- Clinical Pharmacology; Genentech Research and Early Development; South San Francisco California USA
| | | | - Vikram Arya
- Division of Clinical Pharmacology IV; Office of Clinical Pharmacology; Office of Translational Sciences; Center for Drug Evaluation and Research; Food and Drug Administration; Silver Spring Maryland USA
| | - Aleksandra Galetin
- Centre for Applied Pharmacokinetic Research; School of Health Sciences; University of Manchester; Manchester UK
| | - Kathleen M. Giacomini
- Department of Bioengineering and Therapeutic Sciences; Schools of Pharmacy and Medicine; University of California; San Francisco California USA
| | - Imad Hanna
- Pharmacokinetic Sciences; Novartis Institutes for Biomedical Research; East Hanover New Jersey USA
| | - Hiroyuki Kusuhara
- Graduate School of Pharmaceutical Sciences; The University of Tokyo; Tokyo Japan
| | - Yurong Lai
- Drug Metabolism; Gilead Science, Inc.; Foster City California USA
| | - David Rodrigues
- Pharmacokinetics, Dynamics, & Metabolism; Medicine Design; Pfizer Inc.; Groton Connecticut USA
| | - Yuichi Sugiyama
- Sugiyama Laboratory; RIKEN Baton Zone Program, Cluster for Science; RIKEN; Yokohama Japan
| | | | - Lei Zhang
- Office of Research and Standards; Office of Generic Drugs; Center for Drug Evaluation and Research; Food and Drug Administration; Silver Spring Maryland USA
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30
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Wang YH, Chen D, Hartmann G, Cho CR, Menzel K. PBPK Modeling Strategy for Predicting Complex Drug Interactions of Letermovir as a Perpetrator in Support of Product Labeling. Clin Pharmacol Ther 2018; 105:515-523. [PMID: 29901213 DOI: 10.1002/cpt.1120] [Citation(s) in RCA: 19] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/22/2018] [Accepted: 05/08/2018] [Indexed: 12/11/2022]
Abstract
Letermovir is a human cytomegalovirus (CMV) terminase inhibitor for the prophylaxis of CMV infection in allogeneic hematopoietic stem-cell transplant (HSCT) recipients. In vitro, letermovir is a time-dependent inhibitor and an inducer of cytochrome P450 (CYP)3A, and an inhibitor of CYP2C8 and organic anion transporting polypeptide (OATP)1B. A stepwise approach was taken to qualify the interaction model of an existing letermovir physiologically based pharmacokinetic model to predict letermovir interactions with CYP3A and OATP1B. The model was then used to prospectively predict the interaction between letermovir and CYP2C8 substrates such as repaglinide, a substrate of CYP2C8, CYP3A, and OATP1B. The results showed that letermovir modestly increased the exposure of CYP2C8 substrates. These results were used to inform the US prescribing information in the absence of clinical drug-drug interaction studies. In addition, midazolam interactions with letermovir at therapeutic doses were also simulated to confirm that letermovir is a moderate CYP3A inhibitor.
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Affiliation(s)
- Ying-Hong Wang
- Merck Research Laboratories, Merck & Co., West Point, Pennsylvania, USA
| | - Dapeng Chen
- Merck Research Laboratories, Merck & Co., West Point, Pennsylvania, USA
| | - Georgy Hartmann
- Merck Research Laboratories, Merck & Co., West Point, Pennsylvania, USA
| | - Carolyn R Cho
- Merck Research Laboratories, Merck & Co., West Point, Pennsylvania, USA
| | - Karsten Menzel
- Merck Research Laboratories, Merck & Co., West Point, Pennsylvania, USA
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31
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Itkonen MK, Tornio A, Lapatto-Reiniluoto O, Neuvonen M, Neuvonen PJ, Niemi M, Backman JT. Clopidogrel Increases Dasabuvir Exposure With or Without Ritonavir, and Ritonavir Inhibits the Bioactivation of Clopidogrel. Clin Pharmacol Ther 2018; 105:219-228. [PMID: 29696643 PMCID: PMC6585621 DOI: 10.1002/cpt.1099] [Citation(s) in RCA: 43] [Impact Index Per Article: 7.2] [Reference Citation Analysis] [Abstract] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/19/2018] [Accepted: 04/23/2018] [Indexed: 12/11/2022]
Abstract
Dasabuvir is mainly metabolized by cytochrome P450 (CYP) 2C8 and is predominantly used in a regimen containing ritonavir. Ritonavir and clopidogrel are inhibitors of CYP3A4 and CYP2C8, respectively. In a randomized, crossover study in 12 healthy subjects, we examined the impact of clinical doses of ritonavir (for 5 days), clopidogrel (for 3 days), and their combination on dasabuvir pharmacokinetics, and the effect of ritonavir on clopidogrel. Clopidogrel, but not ritonavir, increased the geometric mean AUC0‐∞ of dasabuvir 4.7‐fold; range 2.0–10.1‐fold (P = 8·10−7), compared with placebo. Clopidogrel and ritonavir combination increased dasabuvir AUC0‐∞ 3.9‐fold; range 2.1–7.9‐fold (P = 2·10−6), compared with ritonavir alone. Ritonavir decreased the AUC0‐4h of clopidogrel active metabolite by 51% (P = 0.0001), and average platelet inhibition from 51% without ritonavir to 31% with ritonavir (P = 0.0007). In conclusion, clopidogrel markedly elevates dasabuvir concentrations, and patients receiving ritonavir are at risk for diminished clopidogrel response.
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Affiliation(s)
- Matti K Itkonen
- Department of Clinical Pharmacology, University of Helsinki and Helsinki University Hospital, Helsinki, Finland
| | - Aleksi Tornio
- Department of Clinical Pharmacology, University of Helsinki and Helsinki University Hospital, Helsinki, Finland
| | - Outi Lapatto-Reiniluoto
- Department of Clinical Pharmacology, University of Helsinki and Helsinki University Hospital, Helsinki, Finland
| | - Mikko Neuvonen
- Department of Clinical Pharmacology, University of Helsinki and Helsinki University Hospital, Helsinki, Finland
| | - Pertti J Neuvonen
- Department of Clinical Pharmacology, University of Helsinki and Helsinki University Hospital, Helsinki, Finland
| | - Mikko Niemi
- Department of Clinical Pharmacology, University of Helsinki and Helsinki University Hospital, Helsinki, Finland
| | - Janne T Backman
- Department of Clinical Pharmacology, University of Helsinki and Helsinki University Hospital, Helsinki, Finland
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32
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Mitra P, Weinheimer S, Michalewicz M, Taub ME. Prediction and Quantification of Hepatic Transporter-Mediated Uptake of Pitavastatin Utilizing a Combination of the Relative Activity Factor Approach and Mechanistic Modeling. Drug Metab Dispos 2018; 46:953-963. [PMID: 29666154 DOI: 10.1124/dmd.118.080614] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/22/2018] [Accepted: 04/12/2018] [Indexed: 12/21/2022] Open
Abstract
Quantification of the fraction transported (ft) by a particular transporter will facilitate more robust estimations of transporter interactions. Using pitavastatin as a model uptake transporter substrate, we investigated the utility of the relative activity factor (RAF) approach and mechanistic modeling to estimate ft in hepatocytes. The transporters evaluated were organic anion-transporting polypeptides OATP1B1 and OATP1B3 and sodium-taurocholate cotransporting polypeptide. Transporter-expressing human embryonic kidney 293 cells and human hepatocytes were used for determining RAF values, which were then incorporated into the mechanistic model to simulate hepatocyte uptake of pitavastatin over time. There was excellent agreement between simulated and observed hepatocyte uptake of pitavastatin, indicating the suitability of this approach for translation of uptake from individual transporter-expressing cells to more holistic in vitro models. Subsequently, ft values were determined. The largest contributor to hepatocyte uptake of pitavastatin was OATP1B1, which correlates with what is known about the in vivo disposition of pitavastatin. The ft values were then used for evaluating in vitro-in vivo correlations of hepatic uptake inhibition with OATP inhibitors rifampicin and cyclosporine. Predictions were compared with previously reported plasma exposure changes of pitavastatin with these inhibitors. Although hepatic uptake inhibition of pitavastatin was 2-3-fold underpredicted, incorporation of scaling factors (SFs) into RAF values significantly improved the predictive ability. We propose that calibration of hepatocytes with standard transporter substrates and inhibitors would allow for determination of system-specific SFs, which could subsequently be used for refining predictions of clinical DDI potential for new chemical entities that undergo active hepatic uptake.
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Affiliation(s)
- Pallabi Mitra
- Drug Metabolism and Pharmacokinetics Department, Boehringer Ingelheim Pharmaceuticals Inc., Ridgefield, Connecticut
| | - Samantha Weinheimer
- Drug Metabolism and Pharmacokinetics Department, Boehringer Ingelheim Pharmaceuticals Inc., Ridgefield, Connecticut
| | - Meeghan Michalewicz
- Drug Metabolism and Pharmacokinetics Department, Boehringer Ingelheim Pharmaceuticals Inc., Ridgefield, Connecticut
| | - Mitchell E Taub
- Drug Metabolism and Pharmacokinetics Department, Boehringer Ingelheim Pharmaceuticals Inc., Ridgefield, Connecticut
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33
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Alam K, Crowe A, Wang X, Zhang P, Ding K, Li L, Yue W. Regulation of Organic Anion Transporting Polypeptides (OATP) 1B1- and OATP1B3-Mediated Transport: An Updated Review in the Context of OATP-Mediated Drug-Drug Interactions. Int J Mol Sci 2018. [PMID: 29538325 PMCID: PMC5877716 DOI: 10.3390/ijms19030855] [Citation(s) in RCA: 54] [Impact Index Per Article: 9.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023] Open
Abstract
Organic anion transporting polypeptides (OATP) 1B1 and OATP1B3 are important hepatic transporters that mediate the uptake of many clinically important drugs, including statins from the blood into the liver. Reduced transport function of OATP1B1 and OATP1B3 can lead to clinically relevant drug-drug interactions (DDIs). Considering the importance of OATP1B1 and OATP1B3 in hepatic drug disposition, substantial efforts have been given on evaluating OATP1B1/1B3-mediated DDIs in order to avoid unwanted adverse effects of drugs that are OATP substrates due to their altered pharmacokinetics. Growing evidences suggest that the transport function of OATP1B1 and OATP1B3 can be regulated at various levels such as genetic variation, transcriptional and post-translational regulation. The present review summarizes the up to date information on the regulation of OATP1B1 and OATP1B3 transport function at different levels with a focus on potential impact on OATP-mediated DDIs.
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Affiliation(s)
- Khondoker Alam
- Department of Pharmaceutical Sciences, College of Pharmacy, University of Oklahoma Health Sciences Center, Oklahoma City, OK 73117, USA.
| | - Alexandra Crowe
- Department of Pharmaceutical Sciences, College of Pharmacy, University of Oklahoma Health Sciences Center, Oklahoma City, OK 73117, USA.
| | - Xueying Wang
- Center for Computational Biology and Bioinformatics, Indiana Institute of Personalized Medicine, Department of Medical and Molecular Genetics, Indiana University School of Medicine, Indianapolis, IN 46202, USA.
| | - Pengyue Zhang
- Center for Computational Biology and Bioinformatics, Indiana Institute of Personalized Medicine, Department of Medical and Molecular Genetics, Indiana University School of Medicine, Indianapolis, IN 46202, USA.
| | - Kai Ding
- Department of Biostatistics and Epidemiology, College of Public Health, University of Oklahoma Health Sciences Center, Oklahoma City, OK 73126, USA.
| | - Lang Li
- Center for Computational Biology and Bioinformatics, Indiana Institute of Personalized Medicine, Department of Medical and Molecular Genetics, Indiana University School of Medicine, Indianapolis, IN 46202, USA.
- Department of Biomedical Informatics, Ohio State University, Columbus, OH 43210, USA.
| | - Wei Yue
- Department of Pharmaceutical Sciences, College of Pharmacy, University of Oklahoma Health Sciences Center, Oklahoma City, OK 73117, USA.
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34
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Ji JZ, Huang BB, Gu TT, Tai T, Zhou H, Jia YM, Mi QY, Zhang MR, Xie HG. Human UGT2B7 is the major isoform responsible for the glucuronidation of clopidogrel carboxylate. Biopharm Drug Dispos 2018; 39:88-98. [PMID: 29240983 DOI: 10.1002/bdd.2117] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/05/2017] [Revised: 11/20/2017] [Accepted: 11/26/2017] [Indexed: 01/28/2023]
Abstract
Clopidogrel is predominantly hydrolyzed to clopidogrel carboxylic acid (CCA) by carboxylesterase 1, and subsequently CCA is glucuronidated to clopidogrel acyl glucuronide (CAG) by uridine diphosphate-glucuronosyltransferases (UGTs); however, the UGT isoenzymes glucuronidating CCA remain unidentified to date. In this study, the glucuronidation of CCA was screened with pooled human liver microsomes (HLMs) and 7 human recombinant UGT (rUGT) isoforms. Results indicated that rUGT2B7 exhibited the highest catalytical activity for the CCA glucuronidation as measured with a mean Vmax value of 120.9 pmol/min/mg protein, 3- to 12-fold higher than that of the other rUGT isoforms tested. According to relative activity factor approach, the relative contribution of rUGT2B7 to CCA glucuronidation was estimated to be 58.6%, with the minor contributions (3%) from rUGT1A9. Moreover, the glucuronidation of CCA followed Michaelis-Menten kinetics with a mean Km value of 372.9 μM and 296.4 μM for pooled HLMs and rUGT2B7, respectively, showing similar affinity for both. The formation of CAG was significantly inhibited by azidothymidine and gemfibrozil (well-characterized UGT2B7 substrates) in a concentration-dependent manner, or by fluconazole (a typical UGT2B7-selective inhibitor) in a time-dependent manner, for both HLMs and rUGT2B7, respectively. In addition, CCA inhibited azidothymidine glucuronidation (catalyzed almost exclusively by UGT2B7) by HLMs and rUGT2B7 in a concentration-dependent manner, indicating that CCA is a substrate of UGT2B7. These results reveal that UGT2B7 is the major enzyme catalyzing clopidogrel glucuronidation in the human liver, and that there is the potential for drug-drug interactions between clopidogrel and the other substrate drugs of UGT2B7.
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Affiliation(s)
- Jin-Zi Ji
- General Clinical Research Center, Nanjing First Hospital, Nanjing Medical University, Nanjing, 210006, China
| | - Bei-Bei Huang
- General Clinical Research Center, Nanjing First Hospital, Nanjing Medical University, Nanjing, 210006, China
| | - Tong-Tong Gu
- General Clinical Research Center, Nanjing First Hospital, Nanjing Medical University, Nanjing, 210006, China
| | - Ting Tai
- General Clinical Research Center, Nanjing First Hospital, Nanjing Medical University, Nanjing, 210006, China
| | - Huan Zhou
- General Clinical Research Center, Nanjing First Hospital, Nanjing Medical University, Nanjing, 210006, China.,Department of Clinical Pharmacy, School of Basic Medicine and Clinical Pharmacy, China Pharmaceutical University, Nanjing, 211198, China
| | - Yu-Meng Jia
- General Clinical Research Center, Nanjing First Hospital, Nanjing Medical University, Nanjing, 210006, China.,Department of Clinical Pharmacy, School of Basic Medicine and Clinical Pharmacy, China Pharmaceutical University, Nanjing, 211198, China
| | - Qiong-Yu Mi
- General Clinical Research Center, Nanjing First Hospital, Nanjing Medical University, Nanjing, 210006, China
| | - Meng-Ran Zhang
- General Clinical Research Center, Nanjing First Hospital, Nanjing Medical University, Nanjing, 210006, China
| | - Hong-Guang Xie
- General Clinical Research Center, Nanjing First Hospital, Nanjing Medical University, Nanjing, 210006, China.,Department of Clinical Pharmacy, School of Basic Medicine and Clinical Pharmacy, China Pharmaceutical University, Nanjing, 211198, China.,Departments of Pharmacology and Clinical Pharmacy, Nanjing Medical University School of Pharmacy, Nanjing, 211166, China
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35
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Pakkir Maideen NM, Manavalan G, Balasubramanian K. Drug interactions of meglitinide antidiabetics involving CYP enzymes and OATP1B1 transporter. Ther Adv Endocrinol Metab 2018; 9:259-268. [PMID: 30181852 PMCID: PMC6116761 DOI: 10.1177/2042018818767220] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/13/2017] [Accepted: 02/16/2018] [Indexed: 12/11/2022] Open
Abstract
Meglitinides such as repaglinide and nateglinide are useful to treat type 2 diabetes patients who follow a flexible lifestyle. They are short-acting insulin secretagogues and are associated with less risk of hypoglycemia, weight gain and chronic hyperinsulinemia compared with sulfonylureas. Meglitinides are the substrates of cytochrome P450 (CYP) enzymes and organic anion transporting polypeptide 1B1 (OATP1B1 transporter) and the coadministration of the drugs affecting them will result in pharmacokinetic drug interactions. This article focuses on the drug interactions of meglitinides involving CYP enzymes and OATP1B1 transporter. To prevent the risk of hypoglycemic episodes, prescribers and pharmacists must be aware of the adverse drug interactions of meglitinides.
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36
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Itkonen MK, Tornio A, Filppula AM, Neuvonen M, Neuvonen PJ, Niemi M, Backman JT. Clopidogrel but Not Prasugrel Significantly Inhibits the CYP2C8-Mediated Metabolism of Montelukast in Humans. Clin Pharmacol Ther 2017; 104:495-504. [PMID: 29171020 PMCID: PMC6175296 DOI: 10.1002/cpt.947] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/27/2017] [Revised: 11/13/2017] [Accepted: 11/17/2017] [Indexed: 12/14/2022]
Abstract
The oxidation of montelukast is mainly mediated by cytochrome P450 (CYP) 2C8, but other mechanisms may contribute to its disposition. In healthy volunteers, we investigated the effects of two widely used P2Y12 inhibitors on montelukast pharmacokinetics. Clopidogrel (300 mg on day 1 and 75 mg on day 2) increased the area under the plasma concentration–time curve (AUC) of montelukast 2.0‐fold (90% confidence interval (CI) 1.72–2.28, P < 0.001) and decreased the M6:montelukast AUC0‐7h ratio to 45% of control (90% CI 40–50%, P < 0.001). Prasugrel (60 mg on day 1 and 10 mg on day 2) had no clinically meaningful effect on montelukast pharmacokinetics. Our results imply that clopidogrel is at least a moderate inhibitor of CYP2C8, but prasugrel is not a clinically relevant CYP2C8 inhibitor. The different interaction potentials of clopidogrel and prasugrel are important to consider when antiplatelet therapy is planned for patients at risk for polypharmacy with CYP2C8 substrates.
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Affiliation(s)
- Matti K Itkonen
- Department of Clinical Pharmacology, University of Helsinki and Helsinki University Hospital, Helsinki, Finland
| | - Aleksi Tornio
- Department of Clinical Pharmacology, University of Helsinki and Helsinki University Hospital, Helsinki, Finland
| | - Anne M Filppula
- Department of Clinical Pharmacology, University of Helsinki and Helsinki University Hospital, Helsinki, Finland.,Uppsala Drug Optimization and Pharmaceutical Profiling Platform (UDOPP), Department of Pharmacy, Uppsala University, Uppsala, Sweden
| | - Mikko Neuvonen
- Department of Clinical Pharmacology, University of Helsinki and Helsinki University Hospital, Helsinki, Finland
| | - Pertti J Neuvonen
- Department of Clinical Pharmacology, University of Helsinki and Helsinki University Hospital, Helsinki, Finland
| | - Mikko Niemi
- Department of Clinical Pharmacology, University of Helsinki and Helsinki University Hospital, Helsinki, Finland
| | - Janne T Backman
- Department of Clinical Pharmacology, University of Helsinki and Helsinki University Hospital, Helsinki, Finland
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37
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Shebley M, Fu W, Badri P, Bow DAJ, Fischer V. Physiologically Based Pharmacokinetic Modeling Suggests Limited Drug-Drug Interaction Between Clopidogrel and Dasabuvir. Clin Pharmacol Ther 2017; 102:679-687. [PMID: 28411400 PMCID: PMC5599937 DOI: 10.1002/cpt.689] [Citation(s) in RCA: 27] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/25/2016] [Revised: 03/10/2017] [Accepted: 03/11/2017] [Indexed: 12/14/2022]
Abstract
Dasabuvir, a nonnucleoside NS5B polymerase inhibitor, is a sensitive substrate of cytochrome P450 (CYP) 2C8 with a potential for drug-drug interaction (DDI) with clopidogrel. A physiologically based pharmacokinetic (PBPK) model was developed for dasabuvir to evaluate the DDI potential with clopidogrel, the acyl-β-D glucuronide metabolite of which has been reported as a strong mechanism-based inhibitor of CYP2C8 based on an interaction with repaglinide. In addition, the PBPK model for clopidogrel and its metabolite were updated with additional in vitro data. Sensitivity analyses using these PBPK models suggested that CYP2C8 inhibition by clopidogrel acyl-β-D glucuronide may not be as potent as previously suggested. The dasabuvir and updated clopidogrel PBPK models predict a moderate increase of 1.5-1.9-fold for Cmax and 1.9-2.8-fold for AUC of dasabuvir when coadministered with clopidogrel. While the PBPK results suggest there is a potential for DDI between dasabuvir and clopidogrel, the magnitude is not expected to be clinically relevant.
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Affiliation(s)
- M Shebley
- Drug Metabolism, Pharmacokinetics and BioanalysisAbbVie Inc.North ChicagoIllinoisUSA
- Clinical Pharmacology and PharmacometricsAbbVie Inc.North ChicagoIllinoisUSA
| | - W Fu
- Drug Metabolism, Pharmacokinetics and BioanalysisAbbVie Inc.North ChicagoIllinoisUSA
- U.S. Food and Drug Administration, CDEROffice of Clinical PharmacologySilver SpringMarylandUSA
| | - P Badri
- Clinical Pharmacology and PharmacometricsAbbVie Inc.North ChicagoIllinoisUSA
- Vertex PharmaceuticalsBostonMassachusettsUSA
| | - DAJ Bow
- Drug Metabolism, Pharmacokinetics and BioanalysisAbbVie Inc.North ChicagoIllinoisUSA
| | - V Fischer
- Drug Metabolism, Pharmacokinetics and BioanalysisAbbVie Inc.North ChicagoIllinoisUSA
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Kim SJ, Toshimoto K, Yao Y, Yoshikado T, Sugiyama Y. Quantitative Analysis of Complex Drug–Drug Interactions Between Repaglinide and Cyclosporin A/Gemfibrozil Using Physiologically Based Pharmacokinetic Models With In Vitro Transporter/Enzyme Inhibition Data. J Pharm Sci 2017; 106:2715-2726. [DOI: 10.1016/j.xphs.2017.04.063] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/27/2017] [Revised: 04/17/2017] [Accepted: 04/24/2017] [Indexed: 12/14/2022]
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Quantitative Analyses of the Influence of Parameters Governing Rate-Determining Process of Hepatic Elimination of Drugs on the Magnitudes of Drug-Drug Interactions via Hepatic OATPs and CYP3A Using Physiologically Based Pharmacokinetic Models. J Pharm Sci 2017; 106:2739-2750. [DOI: 10.1016/j.xphs.2017.05.001] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/24/2017] [Revised: 04/20/2017] [Accepted: 05/01/2017] [Indexed: 01/20/2023]
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40
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Arya V, Zhao P, Reynolds KS, Mishra P, Younis IR. Utilizing PBPK Modeling to Evaluate the Potential of a Significant Drug-Drug Interaction Between Clopidogrel and Dasabuvir: A Scientific Perspective. Clin Pharmacol Ther 2017; 102:578-580. [PMID: 28444890 DOI: 10.1002/cpt.699] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/10/2016] [Revised: 03/27/2017] [Accepted: 03/28/2017] [Indexed: 02/06/2023]
Abstract
Dasabuvir, a component of VIEKIRA PAK, is a substrate of CYP2C8 enzymes. Prescribing information for VIEKIRA PAK contraindicates gemfibrozil, a strong CYP2C8 inhibitor, because coadministration significantly increases dasabuvir exposures, which may increase the risk of QT prolongation. Clopidogrel may increase dasabuvir exposures primarily due to CYP2C8 inhibition by clopidogrel-acyl-β-D-glucuronide. This commentary outlines the US Food and Drug Administration (FDA) interdisciplinary review team's scientific perspective to address the potential for a significant drug-drug interaction (DDI) between clopidogrel and VIEKIRA PAK.
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Affiliation(s)
- V Arya
- Division of Clinical Pharmacology IV, Office of Clinical Pharmacology, Office of Translational Sciences, Center for Drug Evaluation and Research, Food and Drug Administration, Silver Spring, Maryland, USA
| | - P Zhao
- Division of Pharmacometrics, Office of Clinical Pharmacology, Office of Translational Sciences, Center for Drug Evaluation and Research, Food and Drug Administration, Silver Spring, Maryland, USA
| | - K S Reynolds
- Division of Clinical Pharmacology IV, Office of Clinical Pharmacology, Office of Translational Sciences, Center for Drug Evaluation and Research, Food and Drug Administration, Silver Spring, Maryland, USA
| | - P Mishra
- Division of Antiviral Products, Office of Antimicrobial Products, Center for Drug Evaluation and Research, Food and Drug Administration, Silver Spring, Maryland, USA
| | - I R Younis
- Division of Clinical Pharmacology IV, Office of Clinical Pharmacology, Office of Translational Sciences, Center for Drug Evaluation and Research, Food and Drug Administration, Silver Spring, Maryland, USA
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