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Uehara S, Suemizu H, Yamazaki H. Cytochrome P450s in chimeric mice with humanized liver. ADVANCES IN PHARMACOLOGY (SAN DIEGO, CALIF.) 2022; 95:307-328. [PMID: 35953159 DOI: 10.1016/bs.apha.2022.05.004] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/15/2023]
Abstract
Chimeric mice with humanized livers (humanized liver mice) are attractive experimental animal models for drug metabolism and pharmacokinetic studies. The "humanized liver" is a mature and functional liver with zonal position-specific expressions of human cytochrome P450 (P450) enzymes and a global gene expression pattern consistent with that of the mature human liver. Most P450-dependent drug oxidation activities were comparable between microsomes from livers of human and humanized liver mice based on similar expression levels of human P450 enzymes; however, some differences were observed between the two species, including considerable variations in activities of bufuralol 1'-hydroxylation and propafenone 4'-hydroxylation. Human disproportionate and/or unique metabolites of P450 substrate drugs were produced in humanized liver mice. Plasma concentration profiles of typical P450 substrate drugs in humans could be extrapolated from the corresponding data in humanized liver mice using simplified physiologically based pharmacokinetic modeling. Drug-drug interaction-mediated hepatic human CYP3A/2C induction by rifampicin (a human pregnane X receptor agonist) was observed in humanized liver mice. The major role of human CYP2C9 in in vivo diclofenac 4'-hydroxylation were determined using human CYP2C9-inactivated chimeric mice using a mechanism-based inhibitor, tienilic acid. Overall, based on the functional characteristics of hepatic human P450 enzymes, humanized liver mice are valuable experimental animals for studying metabolite profiling, pharmacokinetics, and drug interactions.
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Affiliation(s)
- Shotaro Uehara
- Central Institute for Experimental Animals, Kawasaki, Kanagawa, Japan.
| | - Hiroshi Suemizu
- Central Institute for Experimental Animals, Kawasaki, Kanagawa, Japan
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Niu S, Li Y, Dong W, Xia L, Shen T, Wang J, Wang Q, Zhang T, Zhang M, Liu G, Guo D, Fang Y. A Randomized Study on the Bioequivalence of Desloratadine in Healthy Chinese Subjects and the Association of Different Metabolic Phenotypes With UGT2B10 and CYP2C8 Genotypes. Curr Drug Metab 2020; 21:1031-1039. [PMID: 33109037 DOI: 10.2174/1389200221999201027143903] [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: 06/09/2020] [Revised: 09/24/2020] [Accepted: 09/29/2020] [Indexed: 11/22/2022]
Abstract
BACKGROUND Desloratadine is a drug with a phenotypic polymorphism in metabolism and has been approved for use in many countries to treat allergic diseases. CYP2C8 and UGT2B10 are metabolic enzymes, which may be involved in the metabolism of desloratadine. OBJECTIVE This study aimed to demonstrate bioequivalence between the test product (desloratadine tablet) and the reference product AERIUS (5mg), both orally administered. And the role of UGT2B10 and CYP2C8 genotypes in healthy Chinese subjects with different Desloratadine metabolic phenotypes was examined. METHODS It was a randomized, open-label, and four-sequence, single-dose crossover study conducted on 56 healthy Chinese subjects. The pharmacokinetics (PK) and safety of the test and reference Desloratadine products were compared. UGT2B10 and CYP2C8 genotypes were determined by the TaqMan assay using genomic DNA. Multiple linear regression was applied to analyze the correlation between genotypes and the metabolic ratio. RESULTS The mean serum concentration-time curves of desloratadine and 3-OH-desloratadine were similar between the test product and the reference product. For the PK similarity comparison, the 90% CIs for the geometric mean ratios of Cmax, AUC0-t, and AUC0-∞ of desloratadine and 3-OH-desloratadine of test and reference product were completely within 80-125%. None of all 56 subjects had serious adverse events. Only 2 subjects were poor-metabolizers in 56 healthy subjects. There was no significant correlation between investigated genotypes of CYP2C8 and UGT2B10 and the metabolic ratio. CONCLUSION The test desloratadine tablet was bioequivalent to the reference product. No direct relationship between CYP2C8 and UGT2B10 genotypes and desloratadine metabolic ratio was identified.
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Affiliation(s)
- Suping Niu
- Scientific Research Department, Clinical Trial Institution, Peking University People's Hospital, Beijing, China
| | - Yan Li
- Department of Pharmacy, Jincheng General Hospital, Jincheng, China
| | - Wenliang Dong
- Department of Pharmacy, Peking University People's Hospital, Beijing, China
| | - Lin Xia
- Department of Pharmacy, Peking University People's Hospital, Beijing, China
| | - Tiantian Shen
- Department of Pharmacy, Peking University People's Hospital, Beijing, China
| | - Jiaxue Wang
- Department of Pharmacy, Peking University People's Hospital, Beijing, China
| | - Qian Wang
- Nursing Department, Peking University People's Hospital, Beijing, China
| | - Tan Zhang
- Leiden Academic Center for Drug Research, Faculty of Science, Leiden University, Leiden, Netherlands
| | - Minjie Zhang
- Beijing United-Power Pharma Tech Co. Ltd. Beijing, China
| | - Gang Liu
- Department of Pharmacy, Peking University People's Hospital, Beijing, China
| | - Danjie Guo
- Scientific Research Department, Clinical Trial Institution, Peking University People's Hospital, Beijing, China
| | - Yi Fang
- Department of Pharmacy, Peking University People's Hospital, Beijing, China
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Kato S, Shah A, Plesescu M, Miyata Y, Bolleddula J, Chowdhury S, Zhu X. Prediction of Human Disproportionate and Biliary Excreted Metabolites Using Chimeric Mice with Humanized Liver. Drug Metab Dispos 2020; 48:934-943. [PMID: 32665417 DOI: 10.1124/dmd.120.000128] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/24/2020] [Accepted: 07/07/2020] [Indexed: 11/22/2022] Open
Abstract
The PXB-mouse is potentially a useful in vivo model to predict human hepatic metabolism and clearance. Four model compounds, [14C]desloratadine, [3H]mianserin, cyproheptadine, and [3H]carbazeran, all reported with disproportionate human metabolites, were orally administered to PXB- or control SCID mice to elucidate the biotransformation of each of them. For [14C]desloratadine in PXB-mice, O-glucuronide of 3-hydroxydesloratadine was observed as the predominant metabolite in both the plasma and urine. Both 3-hydroxydesloratadine and its O-glucuronide were detected as major drug-related materials in the bile, whereas only 3-hydroxydesloratadine was detected in the feces, suggesting that a fraction of 3-hydroxydesloratadine in feces was derived from deconjugation of its O-glucuronide by gut microflora. This information can help understand the biliary clearance mechanism of a drug and may fill the gap in a human absorption, distribution, metabolism, and excretion study, in which the bile samples are typically not available. The metabolic profiles in PXB-mice were qualitatively similar to those reported in humans in a clinical study in which 3-hydroxydesloratadine and its O-glucuronide were major and disproportionate metabolites compared with rat, mouse, and monkey. In the control SCID mice, neither of the metabolites was detected in any matrix. Similarly, for the other three compounds, all human specific or disproportionate metabolites were detected at a high level in PXB-mice, but they were either minimally observed or not observed in the control mice. Data from these four compounds indicate that studies in PXB-mice can help predict the potential for the presence of human disproportionate metabolites (relative to preclinical species) prior to conducting clinical studies and understand the biliary clearance mechanism of a drug. SIGNIFICANCE STATEMENT: Studies in PXB-mice have successfully predicted the human major and disproportionate metabolites compared with preclinical safety species for desloratadine, mianserin, cyproheptadine, and carbazeran. In addition, biliary excretion data from PXB-mice can help illustrate the human biliary clearance mechanism of a drug.
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Affiliation(s)
- Suguru Kato
- Drug Metabolism and Pharmacokinetics, Takeda Pharmaceutical Company Limited, Cambridge, Massachusetts (S.K., A.S., M.P., J.B., S.C., X.Z.) and Research Planning and Business Development, PhoenixBio USA Corporation, New York City, New York (Y.M.)
| | - Abhi Shah
- Drug Metabolism and Pharmacokinetics, Takeda Pharmaceutical Company Limited, Cambridge, Massachusetts (S.K., A.S., M.P., J.B., S.C., X.Z.) and Research Planning and Business Development, PhoenixBio USA Corporation, New York City, New York (Y.M.)
| | - Mihaela Plesescu
- Drug Metabolism and Pharmacokinetics, Takeda Pharmaceutical Company Limited, Cambridge, Massachusetts (S.K., A.S., M.P., J.B., S.C., X.Z.) and Research Planning and Business Development, PhoenixBio USA Corporation, New York City, New York (Y.M.)
| | - Yoshinari Miyata
- Drug Metabolism and Pharmacokinetics, Takeda Pharmaceutical Company Limited, Cambridge, Massachusetts (S.K., A.S., M.P., J.B., S.C., X.Z.) and Research Planning and Business Development, PhoenixBio USA Corporation, New York City, New York (Y.M.)
| | - Jayaprakasam Bolleddula
- Drug Metabolism and Pharmacokinetics, Takeda Pharmaceutical Company Limited, Cambridge, Massachusetts (S.K., A.S., M.P., J.B., S.C., X.Z.) and Research Planning and Business Development, PhoenixBio USA Corporation, New York City, New York (Y.M.)
| | - Swapan Chowdhury
- Drug Metabolism and Pharmacokinetics, Takeda Pharmaceutical Company Limited, Cambridge, Massachusetts (S.K., A.S., M.P., J.B., S.C., X.Z.) and Research Planning and Business Development, PhoenixBio USA Corporation, New York City, New York (Y.M.)
| | - Xiaochun Zhu
- Drug Metabolism and Pharmacokinetics, Takeda Pharmaceutical Company Limited, Cambridge, Massachusetts (S.K., A.S., M.P., J.B., S.C., X.Z.) and Research Planning and Business Development, PhoenixBio USA Corporation, New York City, New York (Y.M.)
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Shi Z, Wang C, Sun CC. Molecular Origin of the Distinct Tabletability of Loratadine and Desloratadine: Role of the Bonding Area – Bonding Strength Interplay. Pharm Res 2020; 37:133. [DOI: 10.1007/s11095-020-02856-2] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/04/2020] [Accepted: 06/10/2020] [Indexed: 01/21/2023]
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Biopharmaceutical classification of desloratadine - not all drugs are classified the easy way. ACTA PHARMACEUTICA (ZAGREB, CROATIA) 2020; 70:131-144. [PMID: 31955139 DOI: 10.2478/acph-2020-0006] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Accepted: 05/31/2019] [Indexed: 01/19/2023]
Abstract
The biopharmaceutical classification of drugs was designed as a basis for bio-waivers - a mechanism with the double ethical benefit of delivering new drug formulations to the market with less human testing and lower cost. However, many drugs defy simple classification because in vitro permeability and stability assessment can be challenging as shown in this study for desloratadine. Literature shows that desloratadine is highly soluble, while data on luminal stability and permeability are circumstantial. Combined with borderline bioavailability and not really known fraction of absorbed dose, desloratadine was found to be a good example for showing the innovative in vitro approaches necessary to unambiguously classify desloratadine according to Biopharmaceutical Classification System (BCS) guideline. Presented study undoubtedly confirmed that desloratadine solubility is high and dissolution is very rapid for immediate release reference tablets. We have demonstrated deslorata-dine stability under legally required conditions and also in more physiologically relevant media. High in vitro desloratadine permeability was confirmed using Caco-2 and Parallel Artificial Membrane Permeability Assay (PAMPA). Well-established in vitro model with rat intestinal tissue could not be used due to reasons elaborated in this paper.
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Uehara S, Yoneda N, Higuchi Y, Yamazaki H, Suemizu H. Metabolism of desloratadine by chimeric TK-NOG mice transplanted with human hepatocytes. Xenobiotica 2019; 50:733-740. [DOI: 10.1080/00498254.2019.1688892] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
Affiliation(s)
- Shotaro Uehara
- Central Institute for Experimental Animals, Kawasaki, Japan
| | - Nao Yoneda
- Central Institute for Experimental Animals, Kawasaki, Japan
| | | | - Hiroshi Yamazaki
- Laboratory of Drug Metabolism and Pharmacokinetics, Showa Pharmaceutical University, Machida, Japan
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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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Pharmacokinetics, Safety and Cognitive Function Profile of Rupatadine 10, 20 and 40 mg in Healthy Japanese Subjects: A Randomised Placebo-Controlled Trial. PLoS One 2016; 11:e0163020. [PMID: 27632557 PMCID: PMC5025135 DOI: 10.1371/journal.pone.0163020] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/11/2016] [Accepted: 08/31/2016] [Indexed: 12/21/2022] Open
Abstract
Introduction Rupatadine is a marketed second generation antihistamine, with anti-PAF activity, indicated for symptomatic treatment of allergic rhinitis and urticaria. This study was conducted to evaluate the pharmacokinetics (PK), pharmacodynamics (PD), safety and tolerability of rupatadine in healthy Japanese subjects after single and multiple oral doses. Methods In this randomised, double-blind, placebo-controlled study, 27 male and female healthy Japanese subjects were administered single and multiple escalating rupatadine dose of 10, 20 and 40 mg or placebo. Blood samples were collected at different time points for PK measurements and subjects were assessed for safety and tolerability. The effect of rupatadine on cognitive functioning was evaluated by means of computerized cognitive tests: rapid visual information processing (RVP), reaction time (RT), spatial working memory (SWM) and visual analogue scales (VAS). Results Exposure to rupatadine as measured by Cmax and AUC was found to increase in a dose dependent manner over the dose range of 10–40 mg for both single and multiple dose administration. The safety assessments showed that all treatment related side effects were of mild intensity and there were no serious adverse events (SAEs) or withdrawals due to treatment–emergent adverse events (TEAEs) in this study. The therapeutic dose of rupatadine did not show any CNS impairment in any of the cognitive tests. Conclusions This study demonstrated that rupatadine is safe and well tolerated by Japanese healthy subjects. The PK-PD profile confirmed previous experience with rupatadine.
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Han X, Quinney SK, Wang Z, Zhang P, Duke J, Desta Z, Elmendorf JS, Flockhart DA, Li L. Identification and Mechanistic Investigation of Drug-Drug Interactions Associated With Myopathy: A Translational Approach. Clin Pharmacol Ther 2015; 98:321-7. [PMID: 25975815 PMCID: PMC4664558 DOI: 10.1002/cpt.150] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/02/2014] [Revised: 11/11/2015] [Accepted: 05/12/2015] [Indexed: 01/29/2023]
Abstract
Myopathy is a group of muscle diseases that can be induced or exacerbated by drug–drug interactions (DDIs). We sought to identify clinically important myopathic DDIs and elucidate their underlying mechanisms. Five DDIs were found to increase the risk of myopathy based on analysis of observational data from the Indiana Network of Patient Care. Loratadine interacted with simvastatin (relative risk 95% confidence interval [CI] = [1.39, 2.06]), alprazolam (1.50, 2.31), ropinirole (2.06, 5.00), and omeprazole (1.15, 1.38). Promethazine interacted with tegaserod (1.94, 4.64). In vitro investigation showed that these DDIs were unlikely to result from inhibition of drug metabolism by CYP450 enzymes or from inhibition of hepatic uptake via the membrane transporter OATP1B1/1B3. However, we did observe in vitro synergistic myotoxicity of simvastatin and desloratadine, suggesting a role in loratadine–simvastatin interaction. This interaction was epidemiologically confirmed (odds ratio 95% CI = [2.02, 3.65]) using the data from the US Food and Drug Administration Adverse Event Reporting System.
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Affiliation(s)
- X Han
- Department of Pharmacology and Toxicology, Indiana University at Indianapolis, Indianapolis, Indiana, USA.,Center for Computational Biology and Bioinformatics, Indiana University at Indianapolis, Indianapolis, Indiana, USA.,Division of Clinical Pharmacology in the Department of Medicine, Indiana University at Indianapolis, Indianapolis, Indiana, USA
| | - S K Quinney
- Center for Computational Biology and Bioinformatics, Indiana University at Indianapolis, Indianapolis, Indiana, USA.,Department of Obstetrics and Gynecology, Indiana University at Indianapolis, Indianapolis, Indiana, USA.,Indiana Institute of Personalized Medicine, School of Medicine, Indiana University at Indianapolis, Indianapolis, Indiana, USA
| | - Z Wang
- Center for Computational Biology and Bioinformatics, Indiana University at Indianapolis, Indianapolis, Indiana, USA.,Department of Medical and Molecular Genetics, Indiana University at Indianapolis, Indianapolis, Indiana, USA
| | - P Zhang
- Center for Computational Biology and Bioinformatics, Indiana University at Indianapolis, Indianapolis, Indiana, USA
| | - J Duke
- Regenstrief Institute, Indiana University at Indianapolis, Indianapolis, Indiana, USA
| | - Z Desta
- Division of Clinical Pharmacology in the Department of Medicine, Indiana University at Indianapolis, Indianapolis, Indiana, USA.,Indiana Institute of Personalized Medicine, School of Medicine, Indiana University at Indianapolis, Indianapolis, Indiana, USA
| | - J S Elmendorf
- Department of Cellular & Integrative Physiology, Indiana University at Indianapolis, Indianapolis, Indiana, USA
| | - D A Flockhart
- Division of Clinical Pharmacology in the Department of Medicine, Indiana University at Indianapolis, Indianapolis, Indiana, USA.,Indiana Institute of Personalized Medicine, School of Medicine, Indiana University at Indianapolis, Indianapolis, Indiana, USA
| | - L Li
- Center for Computational Biology and Bioinformatics, Indiana University at Indianapolis, Indianapolis, Indiana, USA.,Division of Clinical Pharmacology in the Department of Medicine, Indiana University at Indianapolis, Indianapolis, Indiana, USA.,Department of Medical and Molecular Genetics, Indiana University at Indianapolis, Indianapolis, Indiana, USA.,Regenstrief Institute, Indiana University at Indianapolis, Indianapolis, Indiana, USA
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Wang T, Zhang K, Li T, He L, Xie H, Jiang X, Wang L. Prevalence of Desloratadine Slow-metabolizer Phenotype and Food-dependent Pharmacokinetics of Desloratadine in Healthy Chinese Volunteers. Clin Drug Investig 2015; 35:807-13. [DOI: 10.1007/s40261-015-0343-1] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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Kazmi F, Yerino P, Barbara JE, Parkinson A. Further Characterization of the Metabolism of Desloratadine and Its Cytochrome P450 and UDP-glucuronosyltransferase Inhibition Potential: Identification of Desloratadine as a Relatively Selective UGT2B10 Inhibitor. Drug Metab Dispos 2015; 43:1294-302. [PMID: 26135009 DOI: 10.1124/dmd.115.065011] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/17/2015] [Accepted: 07/01/2015] [Indexed: 11/22/2022] Open
Abstract
Desloratadine (Clarinex), the major active metabolite of loratadine (Claritin), is a nonsedating antihistamine used for the treatment of seasonal allergies and hives. Previously we reported that the formation of 3-hydroxydesloratadine, the major human metabolite of desloratadine, involves three sequential reactions, namely N-glucuronidation by UGT2B10 followed by 3-hydroxylation by CYP2C8 followed by deconjugation (rapid, nonenzymatic hydrolysis of the N-glucuronide). In this study we assessed the perpetrator potential of desloratadine based on in vitro studies of its inhibitory effects on cytochrome P450 and UDP-glucuronosyltransferase (UGT) enzymes in human liver microsomes (HLM). Desloratadine (10 µM) caused no inhibition (<15%) of CYP1A2, CYP2C8, CYP2C9, or CYP2C19 and weak inhibition (32-48%) of CYP2B6, CYP2D6, and CYP3A4/5. In cryopreserved human hepatocytes (CHH), which can form the CYP2C8 substrate desloratadine N-glucuronide, desloratadine did not inhibit the CYP2C8-dependent metabolism of paclitaxel or amodiaquine. Assessment of UGT inhibition identified desloratadine as a potent and relatively selective competitive inhibitor of UGT2B10 (Ki value of 1.3 μM). Chemical inhibition of UGT enzymes in HLM demonstrated that nicotine (UGT2B10 inhibitor) but not hecogenin (UGT1A4 inhibitor) completely inhibited the conversion of desloratadine (1 µM) to 3-hydroxydesloratadine in HLM fortified with both NADPH and UDP-glucuronic acid. 3-Hydroxydesloratadine formation correlated well with levomedetomidine glucuronidation (UGT2B10 marker activity) with a panel of individual CHH (r(2) = 0.72). Overall, the results of this study confirm the role of UGT2B10 in 3-hydroxydesloratadine formation and identify desloratadine as a relatively selective in vitro inhibitor of UGT2B10.
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Affiliation(s)
- Faraz Kazmi
- XenoTech, LLC, Lenexa, Kansas (F.K., P.Y., J.E.B.) and XPD Consulting, Shawnee, Kansas (A.P)
| | - Phyllis Yerino
- XenoTech, LLC, Lenexa, Kansas (F.K., P.Y., J.E.B.) and XPD Consulting, Shawnee, Kansas (A.P)
| | - Joanna E Barbara
- XenoTech, LLC, Lenexa, Kansas (F.K., P.Y., J.E.B.) and XPD Consulting, Shawnee, Kansas (A.P)
| | - Andrew Parkinson
- XenoTech, LLC, Lenexa, Kansas (F.K., P.Y., J.E.B.) and XPD Consulting, Shawnee, Kansas (A.P)
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Kazmi F, Barbara JE, Yerino P, Parkinson A. A Long-Standing Mystery Solved: The Formation of 3-Hydroxydesloratadine Is Catalyzed by CYP2C8 But Prior Glucuronidation of Desloratadine by UDP-Glucuronosyltransferase 2B10 Is an Obligatory Requirement. Drug Metab Dispos 2015; 43:523-33. [DOI: 10.1124/dmd.114.062620] [Citation(s) in RCA: 31] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/05/2023] Open
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13
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Drowsiness and motor responses to consecutive daily doses of promethazine and loratadine. Clin Neurophysiol 2014; 125:2390-6. [DOI: 10.1016/j.clinph.2014.03.026] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/16/2013] [Revised: 03/06/2014] [Accepted: 03/28/2014] [Indexed: 01/06/2023]
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14
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Obach RS. Pharmacologically active drug metabolites: impact on drug discovery and pharmacotherapy. Pharmacol Rev 2013; 65:578-640. [PMID: 23406671 DOI: 10.1124/pr.111.005439] [Citation(s) in RCA: 104] [Impact Index Per Article: 9.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022] Open
Abstract
Metabolism represents the most prevalent mechanism for drug clearance. Many drugs are converted to metabolites that can retain the intrinsic affinity of the parent drug for the pharmacological target. Drug metabolism redox reactions such as heteroatom dealkylations, hydroxylations, heteroatom oxygenations, reductions, and dehydrogenations can yield active metabolites, and in rare cases even conjugation reactions can yield an active metabolite. To understand the contribution of an active metabolite to efficacy relative to the contribution of the parent drug, the target affinity, functional activity, plasma protein binding, membrane permeability, and pharmacokinetics of the active metabolite and parent drug must be known. Underlying pharmacokinetic principles and clearance concepts are used to describe the dispositional behavior of metabolites in vivo. A method to rapidly identify active metabolites in drug research is described. Finally, over 100 examples of drugs with active metabolites are discussed with regard to the importance of the metabolite(s) in efficacy and safety.
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Affiliation(s)
- R Scott Obach
- Pfizer Inc., Eastern Point Rd., Groton, CT 06340, USA.
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15
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Hakooz N, Salem II. Prevalence of desloratadine poor metabolizer phenotype in healthy Jordanian males. Biopharm Drug Dispos 2012; 33:15-21. [DOI: 10.1002/bdd.1770] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/01/2011] [Revised: 12/28/2011] [Accepted: 01/07/2012] [Indexed: 12/23/2022]
Affiliation(s)
- Nancy Hakooz
- Faculty of Pharmacy; University of Jordan; Amman; 11942; Jordan
| | - Isam I. Salem
- IPRC International Pharmaceutical Research Center; 1 Queen Rania Street; Sport City Circle
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Gao L, Li J, Kasserra C, Song Q, Arjomand A, Hesk D, Chowdhury SK. Precision and Accuracy in the Quantitative Analysis of Biological Samples by Accelerator Mass Spectrometry: Application in Microdose Absolute Bioavailability Studies. Anal Chem 2011; 83:5607-16. [DOI: 10.1021/ac2006284] [Citation(s) in RCA: 29] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
| | | | | | - Qi Song
- Accium BioSciences, Inc., Seattle, Washington 98122, United States
| | - Ali Arjomand
- Accium BioSciences, Inc., Seattle, Washington 98122, United States
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Zhou SF, Liu JP, Chowbay B. Polymorphism of human cytochrome P450 enzymes and its clinical impact. Drug Metab Rev 2009; 41:89-295. [PMID: 19514967 DOI: 10.1080/03602530902843483] [Citation(s) in RCA: 502] [Impact Index Per Article: 33.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Abstract
Pharmacogenetics is the study of how interindividual variations in the DNA sequence of specific genes affect drug response. This article highlights current pharmacogenetic knowledge on important human drug-metabolizing cytochrome P450s (CYPs) to understand the large interindividual variability in drug clearance and responses in clinical practice. The human CYP superfamily contains 57 functional genes and 58 pseudogenes, with members of the 1, 2, and 3 families playing an important role in the metabolism of therapeutic drugs, other xenobiotics, and some endogenous compounds. Polymorphisms in the CYP family may have had the most impact on the fate of therapeutic drugs. CYP2D6, 2C19, and 2C9 polymorphisms account for the most frequent variations in phase I metabolism of drugs, since almost 80% of drugs in use today are metabolized by these enzymes. Approximately 5-14% of Caucasians, 0-5% Africans, and 0-1% of Asians lack CYP2D6 activity, and these individuals are known as poor metabolizers. CYP2C9 is another clinically significant enzyme that demonstrates multiple genetic variants with a potentially functional impact on the efficacy and adverse effects of drugs that are mainly eliminated by this enzyme. Studies into the CYP2C9 polymorphism have highlighted the importance of the CYP2C9*2 and *3 alleles. Extensive polymorphism also occurs in other CYP genes, such as CYP1A1, 2A6, 2A13, 2C8, 3A4, and 3A5. Since several of these CYPs (e.g., CYP1A1 and 1A2) play a role in the bioactivation of many procarcinogens, polymorphisms of these enzymes may contribute to the variable susceptibility to carcinogenesis. The distribution of the common variant alleles of CYP genes varies among different ethnic populations. Pharmacogenetics has the potential to achieve optimal quality use of medicines, and to improve the efficacy and safety of both prospective and currently available drugs. Further studies are warranted to explore the gene-dose, gene-concentration, and gene-response relationships for these important drug-metabolizing CYPs.
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Affiliation(s)
- Shu-Feng Zhou
- School of Health Sciences, RMIT University, Bundoora, Victoria, Australia.
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Nicolas JM, Espie P, Molimard M. Gender and interindividual variability in pharmacokinetics. Drug Metab Rev 2009; 41:408-21. [DOI: 10.1080/10837450902891485] [Citation(s) in RCA: 48] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022]
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Chen G, Daaro I, Pramanik BN, Piwinski JJ. Structural characterization of in vitro rat liver microsomal metabolites of antihistamine desloratadine using LTQ-Orbitrap hybrid mass spectrometer in combination with online hydrogen/deuterium exchange HR-LC/MS. JOURNAL OF MASS SPECTROMETRY : JMS 2009; 44:203-213. [PMID: 18853472 DOI: 10.1002/jms.1498] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/26/2023]
Abstract
In vitro drug metabolism study is an integral part of drug discovery process. In this report, we have described the application of LTQ-Orbitrap hybrid mass spectrometer in conjunction with online hydrogen (H)/deuterium (D) exchange high resolution (HR)-LC/MS for structural characterization of in vitro rat liver microsomal metabolites of antihistamine desloratadine. Five metabolites M1--M5 have been identified, including three hydroxylated metabolites M1--M3, one N-oxide M4 and one uncommon aromatized N-oxide M5. Accurate mass data have been obtained in both full scan and MSn mode support assignments of metabolite structures with reported mass errors less than 3 ppm. Online H/D exchange HR-LC/MS experiments provide additional evidence in differentiating hydroxylated metabolites from N-oxides. This study demonstrates the effectiveness of this approach in structural characterization of drug metabolites.
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Affiliation(s)
- Guodong Chen
- Schering-Plough Research Institute, 2015 Galloping Hill Road, Kenilworth, NJ 07033, USA.
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