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Jurva U, Sandinge AS, Baek JM, Avanthay M, Thomson RES, D'Cunha SA, Andersson S, Hayes MA, Gillam EMJ. Biocatalysis using Thermostable Cytochrome P450 Enzymes in Bacterial Membranes - Comparison of Metabolic Pathways with Human Liver Microsomes and Recombinant Human Enzymes. Drug Metab Dispos 2024; 52:242-251. [PMID: 38176735 DOI: 10.1124/dmd.123.001569] [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: 11/09/2023] [Revised: 12/21/2023] [Accepted: 12/22/2023] [Indexed: 01/06/2024] Open
Abstract
Detailed structural characterization of small molecule metabolites is desirable during all stages of drug development, and often relies on the synthesis of metabolite standards. However, introducing structural changes into already complex, highly functionalized small molecules both regio- and stereo-selectively can be challenging using purely chemical approaches, introducing delays into the drug pipeline. An alternative is to use the cytochrome P450 enzymes (P450s) that produce the metabolites in vivo, taking advantage of the enzyme's inherently chiral active site to achieve regio- and stereoselectivity. Importantly, biotransformations are more sustainable: they proceed under mild conditions and avoid environmentally damaging solvents and transition metal catalysts. Recombinant enzymes avoid the need to use animal liver microsomes. However, native enzymes must be stabilized to work for extended periods or at elevated temperatures, and stabilizing mutations can alter catalytic activity. Here we assessed a set of novel, thermostable P450s in bacterial membranes, a format analogous to liver microsomes, for their ability to metabolize drugs through various pathways and compared them to human liver microsomes. Collectively, the thermostable P450s could replicate the metabolic pathways seen with human liver microsomes, including bioactivation to protein-reactive intermediates. Novel metabolites were found, suggesting the possibility of obtaining metabolites not produced by human or rodent liver microsomes. Importantly, no alteration in assay conditions from standard protocols for microsomal incubations was necessary. Thus, such bacterial membranes represent an analogous metabolite generation system to liver microsomes in terms of metabolites produced and ease of use, but which provides access to more diversity of metabolite structures. SIGNIFICANCE STATEMENT: In drug development it is often chemically challenging, to synthesize authentic metabolites of drug candidates for structural identification and evaluation of activity and safety. Biosynthesis using microsomes or recombinant human enzymes is confounded by the instability of the enzymes. Here we show that thermostable ancestral cytochrome P450 enzymes derived from P450 families responsible for human drug metabolism offer advantages over the native human forms in being more robust and over microbial enzymes in faithfully reflecting human drug metabolism.
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Affiliation(s)
- Ulrik Jurva
- Drug Metabolism and Pharmacokinetics (DMPK), Research and Early Development, Cardiovascular, Renal and Metabolism (CVRM), BioPharmaceuticals R&D, AstraZeneca, Gothenburg, Sweden (U.J., A.-S.S.); School of Chemistry and Molecular Biosciences, The University of Queensland, St. Lucia, 4072, Australia (J.M.B., R.E.S.T., S.A.D.C., E.M.J.G.); and Discovery Sciences, BioPharmaceuticals R&D, AstraZeneca, Gothenburg, Sweden (M.A., S.A., M.A.H.)
| | - Ann-Sofie Sandinge
- Drug Metabolism and Pharmacokinetics (DMPK), Research and Early Development, Cardiovascular, Renal and Metabolism (CVRM), BioPharmaceuticals R&D, AstraZeneca, Gothenburg, Sweden (U.J., A.-S.S.); School of Chemistry and Molecular Biosciences, The University of Queensland, St. Lucia, 4072, Australia (J.M.B., R.E.S.T., S.A.D.C., E.M.J.G.); and Discovery Sciences, BioPharmaceuticals R&D, AstraZeneca, Gothenburg, Sweden (M.A., S.A., M.A.H.)
| | - Jong Min Baek
- Drug Metabolism and Pharmacokinetics (DMPK), Research and Early Development, Cardiovascular, Renal and Metabolism (CVRM), BioPharmaceuticals R&D, AstraZeneca, Gothenburg, Sweden (U.J., A.-S.S.); School of Chemistry and Molecular Biosciences, The University of Queensland, St. Lucia, 4072, Australia (J.M.B., R.E.S.T., S.A.D.C., E.M.J.G.); and Discovery Sciences, BioPharmaceuticals R&D, AstraZeneca, Gothenburg, Sweden (M.A., S.A., M.A.H.)
| | - Mickaël Avanthay
- Drug Metabolism and Pharmacokinetics (DMPK), Research and Early Development, Cardiovascular, Renal and Metabolism (CVRM), BioPharmaceuticals R&D, AstraZeneca, Gothenburg, Sweden (U.J., A.-S.S.); School of Chemistry and Molecular Biosciences, The University of Queensland, St. Lucia, 4072, Australia (J.M.B., R.E.S.T., S.A.D.C., E.M.J.G.); and Discovery Sciences, BioPharmaceuticals R&D, AstraZeneca, Gothenburg, Sweden (M.A., S.A., M.A.H.)
| | - Raine E S Thomson
- Drug Metabolism and Pharmacokinetics (DMPK), Research and Early Development, Cardiovascular, Renal and Metabolism (CVRM), BioPharmaceuticals R&D, AstraZeneca, Gothenburg, Sweden (U.J., A.-S.S.); School of Chemistry and Molecular Biosciences, The University of Queensland, St. Lucia, 4072, Australia (J.M.B., R.E.S.T., S.A.D.C., E.M.J.G.); and Discovery Sciences, BioPharmaceuticals R&D, AstraZeneca, Gothenburg, Sweden (M.A., S.A., M.A.H.)
| | - Stephlina A D'Cunha
- Drug Metabolism and Pharmacokinetics (DMPK), Research and Early Development, Cardiovascular, Renal and Metabolism (CVRM), BioPharmaceuticals R&D, AstraZeneca, Gothenburg, Sweden (U.J., A.-S.S.); School of Chemistry and Molecular Biosciences, The University of Queensland, St. Lucia, 4072, Australia (J.M.B., R.E.S.T., S.A.D.C., E.M.J.G.); and Discovery Sciences, BioPharmaceuticals R&D, AstraZeneca, Gothenburg, Sweden (M.A., S.A., M.A.H.)
| | - Shalini Andersson
- Drug Metabolism and Pharmacokinetics (DMPK), Research and Early Development, Cardiovascular, Renal and Metabolism (CVRM), BioPharmaceuticals R&D, AstraZeneca, Gothenburg, Sweden (U.J., A.-S.S.); School of Chemistry and Molecular Biosciences, The University of Queensland, St. Lucia, 4072, Australia (J.M.B., R.E.S.T., S.A.D.C., E.M.J.G.); and Discovery Sciences, BioPharmaceuticals R&D, AstraZeneca, Gothenburg, Sweden (M.A., S.A., M.A.H.)
| | - Martin A Hayes
- Drug Metabolism and Pharmacokinetics (DMPK), Research and Early Development, Cardiovascular, Renal and Metabolism (CVRM), BioPharmaceuticals R&D, AstraZeneca, Gothenburg, Sweden (U.J., A.-S.S.); School of Chemistry and Molecular Biosciences, The University of Queensland, St. Lucia, 4072, Australia (J.M.B., R.E.S.T., S.A.D.C., E.M.J.G.); and Discovery Sciences, BioPharmaceuticals R&D, AstraZeneca, Gothenburg, Sweden (M.A., S.A., M.A.H.)
| | - Elizabeth M J Gillam
- Drug Metabolism and Pharmacokinetics (DMPK), Research and Early Development, Cardiovascular, Renal and Metabolism (CVRM), BioPharmaceuticals R&D, AstraZeneca, Gothenburg, Sweden (U.J., A.-S.S.); School of Chemistry and Molecular Biosciences, The University of Queensland, St. Lucia, 4072, Australia (J.M.B., R.E.S.T., S.A.D.C., E.M.J.G.); and Discovery Sciences, BioPharmaceuticals R&D, AstraZeneca, Gothenburg, Sweden (M.A., S.A., M.A.H.)
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Quantification of abemaciclib and metabolites: evolution of bioanalytical methods supporting a novel oncolytic agent. Bioanalysis 2021; 13:711-724. [PMID: 33870730 DOI: 10.4155/bio-2021-0039] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022] Open
Abstract
Aim: Bioanalytical methods undergo many revisions and modifications throughout drug development to meet the objectives of the study and development program. Results: Validated LC-MS/MS methodology used to quantify abemaciclib and four metabolites in human plasma is described. The method, initially validated to support the first-in-human study, was successfully modified to include additional metabolites as in vitro and in vivo information about the activity and abundance of human metabolites became available. Consistent performance of the method over time was demonstrated by an incurred sample reanalysis passing rate exceeding 95%, across clinical studies. An overview of the numerous methods involved during the development of abemaciclib, including the quantification of drugs evaluated as combination regimens and used as substrates during drug-drug interaction studies, is presented. Conclusion: Robust bioanalytical methods need to be designed with the flexibility required to support the evolving study objectives associated with registration and post-registration trials.
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Qiu Y, Tang C, Li R, Cao S, Zhang Y, Chen X. Simultaneous determination of sutetinib and its active metabolite sutetinib
N
‐oxide in human plasma by liquid chromatography–tandem mass spectrometry: Evaluation of plasma stability. Biomed Chromatogr 2020; 34:e4918. [DOI: 10.1002/bmc.4918] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/02/2020] [Revised: 06/05/2020] [Accepted: 06/10/2020] [Indexed: 11/07/2022]
Affiliation(s)
- Yanan Qiu
- College of Pharmacy Nanchang University Nanchang China
- Shanghai Institute of Materia Medica Chinese Academy of Sciences Shanghai China
| | - Chongzhuang Tang
- Shanghai Institute of Materia Medica Chinese Academy of Sciences Shanghai China
| | - Ranran Li
- Shanghai Institute of Materia Medica Chinese Academy of Sciences Shanghai China
| | - Sumin Cao
- Jiangsu Suzhong Pharmaceutical Group Co. Ltd Taizhou City Jiangsu Province China
| | - Yuqiang Zhang
- Jiangsu Suzhong Pharmaceutical Group Co. Ltd Taizhou City Jiangsu Province China
| | - Xiaoyan Chen
- Shanghai Institute of Materia Medica Chinese Academy of Sciences Shanghai China
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Simultaneous quantitation of the BACE1 inhibitor AZD3293 and its metabolite AZ13569724 in human matrices by LC-MS/MS. Bioanalysis 2017; 9:813-826. [PMID: 28434245 DOI: 10.4155/bio-2017-0003] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022] Open
Abstract
AIM AZD3293 is a novel BACE1 inhibitor in Phase III development for Alzheimer's disease. Sensitive and robust bioanalytical methods were required to quantitate AZD3293 and its metabolite AZ13569724 in human biological matrices. METHODOLOGY/RESULTS Human plasma was prepared by protein precipitation. Linearity for both analytes was in the range of 0.5-500 ng/ml with up to 100-fold dilution. Plasma ultrafiltrate samples were prepared using Centrifree® ultrafiltration device. Urine and CSF samples were analyzed directly after dilution. A 27% decrease in AZD3293 concentrations in the CSF collection apparati was found due to nonspecific binding. Incurred sample reanalysis was acceptable. CONCLUSION Methods for simultaneous quantitation of AZD3293 and its metabolite AZ13569724 in human biological matrices have been validated and successfully applied to clinical studies.
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Iegre J, Hayes MA, Thompson RA, Weidolf L, Isin EM. Database Extraction of Metabolite Information of Drug Candidates: Analysis of 27 AstraZeneca Compounds with Human Absorption, Distribution, Metabolism, and Excretion Data. Drug Metab Dispos 2016; 44:732-40. [DOI: 10.1124/dmd.115.067850] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/28/2015] [Accepted: 02/10/2016] [Indexed: 01/20/2023] Open
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Thompson RA, Isin EM, Ogese MO, Mettetal JT, Williams DP. Reactive Metabolites: Current and Emerging Risk and Hazard Assessments. Chem Res Toxicol 2016; 29:505-33. [DOI: 10.1021/acs.chemrestox.5b00410] [Citation(s) in RCA: 93] [Impact Index Per Article: 11.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022]
Affiliation(s)
- Richard A. Thompson
- DMPK, Respiratory, Inflammation & Autoimmunity iMed, AstraZeneca R&D, 431 83 Mölndal, Sweden
| | - Emre M. Isin
- DMPK, Cardiovascular & Metabolic Diseases iMed, AstraZeneca R&D, 431 83 Mölndal, Sweden
| | - Monday O. Ogese
- Translational Safety, Drug Safety and Metabolism, AstraZeneca R&D, Darwin Building 310, Cambridge Science Park, Milton Rd, Cambridge CB4 0FZ, United Kingdom
| | - Jerome T. Mettetal
- Translational Safety, Drug Safety and Metabolism, AstraZeneca R&D, 35 Gatehouse Dr, Waltham, Massachusetts 02451, United States
| | - Dominic P. Williams
- Translational Safety, Drug Safety and Metabolism, AstraZeneca R&D, Darwin Building 310, Cambridge Science Park, Milton Rd, Cambridge CB4 0FZ, United Kingdom
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Scheer N, Wilson ID. A comparison between genetically humanized and chimeric liver humanized mouse models for studies in drug metabolism and toxicity. Drug Discov Today 2015; 21:250-63. [PMID: 26360054 DOI: 10.1016/j.drudis.2015.09.002] [Citation(s) in RCA: 56] [Impact Index Per Article: 6.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/28/2015] [Revised: 08/07/2015] [Accepted: 09/01/2015] [Indexed: 12/12/2022]
Abstract
Mice that have been genetically humanized for proteins involved in drug metabolism and toxicity and mice engrafted with human hepatocytes are emerging and promising in vivo models for an improved prediction of the pharmacokinetic, drug-drug interaction and safety characteristics of compounds in humans. The specific advantages and disadvantages of these models should be carefully considered when using them for studies in drug discovery and development. Here, an overview on the corresponding genetically humanized and chimeric liver humanized mouse models described to date is provided and illustrated with examples of their utility in drug metabolism and toxicity studies. We compare the strength and weaknesses of the two different approaches, give guidance for the selection of the appropriate model for various applications and discuss future trends and perspectives.
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Affiliation(s)
| | - Ian D Wilson
- Imperial College London, South Kensington, London SW7 2AZ, UK.
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8
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Analytical challenges for conducting rapid metabolism characterization for QIVIVE. Toxicology 2015; 332:20-9. [DOI: 10.1016/j.tox.2013.08.010] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/07/2012] [Revised: 08/05/2013] [Accepted: 08/13/2013] [Indexed: 12/22/2022]
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9
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Khetani SR, Berger DR, Ballinger KR, Davidson MD, Lin C, Ware BR. Microengineered liver tissues for drug testing. ACTA ACUST UNITED AC 2015; 20:216-50. [PMID: 25617027 DOI: 10.1177/2211068214566939] [Citation(s) in RCA: 86] [Impact Index Per Article: 9.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/14/2014] [Indexed: 01/09/2023]
Abstract
Drug-induced liver injury (DILI) is a leading cause of drug attrition. Significant and well-documented differences between animals and humans in liver pathways now necessitate the use of human-relevant in vitro liver models for testing new chemical entities during preclinical drug development. Consequently, several human liver models with various levels of in vivo-like complexity have been developed for assessment of drug metabolism, toxicity, and efficacy on liver diseases. Recent trends leverage engineering tools, such as those adapted from the semiconductor industry, to enable precise control over the microenvironment of liver cells and to allow for miniaturization into formats amenable for higher throughput drug screening. Integration of liver models into organs-on-a-chip devices, permitting crosstalk between tissue types, is actively being pursued to obtain a systems-level understanding of drug effects. Here, we review the major trends, challenges, and opportunities associated with development and implementation of engineered liver models created from primary cells, cell lines, and stem cell-derived hepatocyte-like cells. We also present key applications where such models are currently making an impact and highlight areas for improvement. In the future, engineered liver models will prove useful for selecting drugs that are efficacious, safer, and, in some cases, personalized for specific patient populations.
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Affiliation(s)
- Salman R Khetani
- Department of Mechanical Engineering, Colorado State University, Fort Collins, CO, USA School of Biomedical Engineering, Colorado State University, Fort Collins, CO, USA
| | - Dustin R Berger
- School of Biomedical Engineering, Colorado State University, Fort Collins, CO, USA
| | - Kimberly R Ballinger
- Department of Mechanical Engineering, Colorado State University, Fort Collins, CO, USA
| | - Matthew D Davidson
- School of Biomedical Engineering, Colorado State University, Fort Collins, CO, USA
| | - Christine Lin
- School of Biomedical Engineering, Colorado State University, Fort Collins, CO, USA
| | - Brenton R Ware
- School of Biomedical Engineering, Colorado State University, Fort Collins, CO, USA
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10
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Litzenburger M, Kern F, Khatri Y, Bernhardt R. Conversions of tricyclic antidepressants and antipsychotics with selected P450s from Sorangium cellulosum So ce56. Drug Metab Dispos 2014; 43:392-9. [PMID: 25550480 DOI: 10.1124/dmd.114.061937] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022] Open
Abstract
Human cytochromes P450 (P450s) play a major role in the biotransformation of drugs. The generated metabolites are important for pharmaceutical, medical, and biotechnological applications and can be used for derivatization or toxicological studies. The availability of human drug metabolites is restricted and alternative ways of production are requested. For this, microbial P450s turned out to be a useful tool for the conversion of drugs and related derivatives. Here, we used 10 P450s from the myxobacterium Sorangium cellulosum So ce56, which have been cloned, expressed, and purified. The P450s were investigated concerning the conversion of the antidepressant drugs amitriptyline, clomipramine, imipramine, and promethazine; the antipsychotic drugs carbamazepine, chlorpromazine, and thioridazine, as well as their precursors, iminodibenzyl and phenothiazine. Amitriptyline, chlorpromazine, clomipramine, imipramine, and thioridazine are efficiently converted during the in vitro reaction and were chosen to upscale the production by an Escherichia coli-based whole-cell bioconversion system. Two different approaches, a whole-cell system using M9CA medium and a system using resting cells in buffer, were used for the production of sufficient amounts of metabolites for NMR analysis. Amitriptyline, clomipramine, and imipramine are converted to the corresponding 10-hydroxylated products, whereas the conversion of chlorpromazine and thioridazine leads to a sulfoxidation in position 5. It is shown for the first time that myxobacterial P450s are efficient to produce known human drug metabolites in a milligram scale, revealing their ability to synthesize pharmaceutically important compounds.
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Affiliation(s)
- Martin Litzenburger
- Institut für Biochemie, Universität des Saarlandes, Saarbruecken, Germany (M.L., F.K., Y.K., R.B.)
| | - Fredy Kern
- Institut für Biochemie, Universität des Saarlandes, Saarbruecken, Germany (M.L., F.K., Y.K., R.B.)
| | - Yogan Khatri
- Institut für Biochemie, Universität des Saarlandes, Saarbruecken, Germany (M.L., F.K., Y.K., R.B.)
| | - Rita Bernhardt
- Institut für Biochemie, Universität des Saarlandes, Saarbruecken, Germany (M.L., F.K., Y.K., R.B.)
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Abstract
The utility of in vitro generated kinetic data to provide quantitative prediction of in vivo pharmacokinetic behavior is well established and forms a cornerstone of many research projects in drug metabolism and disposition, particularly within the pharmaceutical industry. This issue provides several excellent examples of the use of in vitro techniques for prediction of human pharmacokinetics (PK). The general area of in vitro-in vivo extrapolation (IVIVE) is broad and hence the spectrum of topics covers various aspects drug clearance and distribution and drug-drug interactions. Some articles were commissioned whereas others were identified during the reviewing process. Overall they provide a snapshot of activity at the end of 2013. They document that whereas the translation of some in vitro approaches is now established, other areas are in their infancy and need more development.
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Affiliation(s)
- J Brian Houston
- Centre for Applied Pharmacokinetic Research, Manchester Pharmacy School, University of Manchester, Manchester, United Kingdom
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12
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Scheer N, Wolf CR. Genetically humanized mouse models of drug metabolizing enzymes and transporters and their applications. Xenobiotica 2013; 44:96-108. [DOI: 10.3109/00498254.2013.815831] [Citation(s) in RCA: 36] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
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13
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Li P, Gong Y, Lim HK, Jian W, Edom RW, Salter R, Silva J, Weng N. Bio-generation of stable isotope labeled internal standards for absolute and relative quantitation of drug metabolites in plasma samples by LC–MS/MS. J Chromatogr B Analyt Technol Biomed Life Sci 2013; 926:92-100. [DOI: 10.1016/j.jchromb.2013.03.006] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/11/2013] [Revised: 03/06/2013] [Accepted: 03/08/2013] [Indexed: 01/23/2023]
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Acikgöz A, Giri S, Bader A. Detection of nanolevel drug metabolites in an organotypic culture of primary human hepatocytes and porcine hepatocytes with special reference to a two-compartment model. Int J Nanomedicine 2012; 7:5859-72. [PMID: 23226017 PMCID: PMC3512542 DOI: 10.2147/ijn.s29651] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022] Open
Abstract
The quantification of drug metabolites produced during drug metabolism is a growing concern for the pharmaceutical industry, regulatory agencies such as the US Food and Drug Administration, the European Medicines Agency, and others. As 70% of drugs are known reactive metabolites and have black box warnings, they are a major cause of drug-induced injury and lead to drug attrition in early or late clinical stages. According to a 2006 survey report of pharmaceutical companies, drug-induced liver injury was ranked first in terms of adverse events, and it remains the most common reason for restriction or withdrawal of a drug from the market by the Food and Drug Administration. Although there are many reasons underlying drug-induced liver injury, one of the most important is liver failure induced by drug metabolites. Generally, a drug produces metabolites that may bind to cellular molecules and trigger a toxicological effect, cause serious adverse drug reactions, or alter cellular functions. Experimental cellular models that attempt to qualify drug metabolites from cell cultures rely on human plasma and urine obtained from clinical trials and supernatant during early in vitro experiments. However, there is a lack of information about the quantification of drug metabolites inside human hepatocytes, where the drug is extensively metabolized. To overcome this limitation, we used the highly accepted, gold standard organotypic cellular model of primary human hepatocytes to investigate and quantify the parent drug, as well as drug metabolites inside human hepatocytes and outside human hepatocytes to evaluate the quantity of drug metabolites, which are assumed to have remained inside the primary human hepatocytes. We refer to this as a two-compartment model, where one compartment is supernatant compared with in vivo hepatic blood circulation, and the other is inside the hepatocyte cell compared with the inside of in vivo human liver. We detected the nanoconcentrations of all major metabolites (desmethyldiazepam, temazepam, and oxazepam) of the diazepam drug, both inside the cells (matrix) and outside the hepatocyte cells (supernatant) at different time points (primary human hepatocytes: 0, 1, 2, 4, 8, and 24 hours; primary porcine hepatocytes: 0, 1, 2, 5, and 24 hours) during biotransformation in an organotypic sandwich cellular model. Although it is difficult to detect tissue distribution of metabolites in humans, we strongly recommend testing in a two-compartment model of primary human hepatocytes, as nonhuman models may not reflect human metabolism. Preclinical drug screening assessment tests that use this two-compartment strategy may facilitate safer registration of new drug candidates.
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Affiliation(s)
- Ali Acikgöz
- Center for Biotechnology and Biomedicine, Cell Techniques and Applied Stem Cell Biology, Universität Leipzig, Germany
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15
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Sharan S, Iwuchukwu OF, Canney DJ, Zimmerman CL, Nagar S. In vivo-formed versus preformed metabolite kinetics of trans-resveratrol-3-sulfate and trans-resveratrol-3-glucuronide. Drug Metab Dispos 2012; 40:1993-2001. [PMID: 22807110 DOI: 10.1124/dmd.112.046417] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022] Open
Abstract
Metabolites in safety testing have gained a lot of attention recently. Regulatory agencies have suggested that the kinetics of preformed and in vivo-formed metabolites are comparable. This subject has been a topic of debate. We have compared the kinetics of in vivo-formed with preformed metabolites. trans-3,5,4'-Trihydroxystilbene [trans-resveratrol (RES)] and its two major metabolites, resveratrol-3-sulfate (R3S) and resveratrol-3-glucuronide (R3G) were used as model substrates. The pharmacokinetics (PK) of R3S and R3G were characterized under two situations. First, the pharmacokinetics of R3S and R3G were characterized (in vivo-formed metabolite) after administration of RES. Then, synthetic R3S and R3G were administered (preformed metabolite) and their pharmacokinetics were characterized. PK models were developed to describe the data. A three-compartment model for RES, a two-compartment model for R3S (preformed), and an enterohepatic cycling model for R3G (preformed) was found to describe the data well. These three models were further combined to build a comprehensive PK model, which was used to perform simulations to predict in vivo-formed metabolite kinetics. Comparisons were made between in vivo-formed and preformed metabolite kinetics. Marked differences were observed in the kinetics of preformed and in vivo-formed metabolites.
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Affiliation(s)
- Satish Sharan
- Department of Pharmaceutical Sciences, Temple University School of Pharmacy, Philadelphia, PA, USA.
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Luffer-Atlas D. The early estimation of circulating drug metabolites in humans. Expert Opin Drug Metab Toxicol 2012; 8:985-97. [PMID: 22681256 DOI: 10.1517/17425255.2012.693159] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
Abstract
INTRODUCTION An evolution in bioanalytical methodologies to identify and quantify drug metabolites has led to a wealth of biotransformation information during preclinical and early clinical testing phases. However, this abundance of metabolism data has not clarified how to select the most important circulating human metabolites for safety assessment. Consequently, more stringent regulatory expectations for a comprehensive approach to human metabolism have led pharmaceutical sponsors to employ a variety of novel methods to estimate circulating drug metabolites in humans and animals. AREAS COVERED This review provides context for 'why' human circulating metabolites must be qualified for safety in animals. A detailed overview is also presented concerning 'where,' 'how' and 'when' to conduct these assessments during drug development. EXPERT OPINION A human metabolite qualification strategy is now a required element of the drug safety package submitted with a new drug application (NDA). The important question is whether or not this additional information, about metabolite safety, is making human drugs any safer. Currently, this is a debatable issue, especially because stand-alone metabolite testing is fraught with its own challenges. As drug development moves into the twenty-first century, there is a pressing need for more sophisticated methodologies to address human drug and metabolite safety.
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Affiliation(s)
- Debra Luffer-Atlas
- Department of Drug Disposition, Lilly Research Laboratories, Indianapolis, IN 46285, USA.
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Gao H, Obach RS. A Simple Liquid Chromatography-Tandem Mass Spectrometry Method to Determine Relative Plasma Exposures of Drug Metabolites across Species for Metabolite Safety Assessments (Metabolites in Safety Testing). II. Application to Unstable Metabolites. Drug Metab Dispos 2012; 40:1290-6. [DOI: 10.1124/dmd.112.044552] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022] Open
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Giri S, Acikgöz A, Pathak P, Gutschker S, Kürsten A, Nieber K, Bader A. Three dimensional cultures of rat liver cells using a natural self-assembling nanoscaffold in a clinically relevant bioreactor for bioartificial liver construction. J Cell Physiol 2011; 227:313-27. [PMID: 21437901 DOI: 10.1002/jcp.22738] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Abstract
Till date, no bioartificial liver (BAL) procedure has obtained FDA approval or widespread clinical acceptance, mainly because of multifactorial limitations such as the use of microscale or undefined biomaterials, indirect and lower oxygenation levels in liver cells, short-term undesirable functions, and a lack of 3D interaction of growth factor/cytokine signaling in liver cells. To overcome preclinical limitations, primary rat liver cells were cultured on a naturally self-assembling peptide nanoscaffold (SAPN) in a clinically relevant bioreactor for up to 35 days, under 3D interaction with suitable growth factors and cytokine signaling agents, alone or combination (e.g., Group I: EPO, Group II: Activin A, Group III: IL-6, Group IV: BMP-4, Group V: BMP4 + EPO, Group VI: EPO + IL-6, Group VII: BMP4 + IL-6, Group VIII: Activin A + EPO, Group IX: IL-6 + Activin A, Group X: Activin A + BMP4, Group XI: EPO + Activin A + BMP-4 + IL-6 + HGF, and Group XII: Control). Major liver specific functions such as albumin secretion, urea metabolism, ammonia detoxification, phase contrast microscopy, immunofluorescence of liver specific markers (Albumin and CYP3A1), mitochondrial status, glutamic oxaloacetic transaminase (GOT) activity, glutamic pyruvic transaminase (GPT) activity, and cell membrane stability by the lactate dehydrogenase (LDH) test were also examined and compared with the control over time. In addition, we examined the drug biotransformation potential of a diazepam drug in a two-compartment model (cell matrix phase and supernatant), which is clinically important. This present study demonstrates an optimized 3D signaling/scaffolding in a preclinical BAL model, as well as preclinical drug screening for better drug development.
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Affiliation(s)
- Shibashish Giri
- Department of Cell Techniques and Applied Stem Cell Biology, Centre for Biotechnology and Biomedicine, University of Leipzig, Leipzig, Germany.
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Izumi T. Assessment of drug metabolites. Drug Metab Pharmacokinet 2011; 26:121-2. [PMID: 21532211 DOI: 10.2133/dmpk.dmpk-11-pf-902] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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NMR spectroscopy as a tool to close the gap on metabolite characterization under MIST. Bioanalysis 2011; 2:1263-76. [PMID: 21083239 DOI: 10.4155/bio.10.77] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022] Open
Abstract
Withdrawals from the market due to unforeseen adverse events have triggered changes in the way therapeutics are discovered and developed. This has resulted in an emphasis on truly understanding the efficacy and toxicity profile of new chemical entities (NCE) and the contributions of their metabolites to on-target pharmacology and off-target receptor-mediated toxicology. Members of the pharmaceutical industry, scientific community and regulatory agencies have held dialogues with respect to metabolites in safety testing (MIST); and both the US FDA and International Conference on Harmonisation have issued guidances with respect to when and how to characterize metabolites for human safety testing. This review provides a brief overview of NMR spectroscopy as applied to the structure elucidation and quantification of drug metabolites within the drug discovery and development process. It covers advances in this technique, including cryogenic cooling of detection circuitry for enhanced sensitivity, hyphenated LC-NMR techniques, improved dynamic range through new solvent-suppression pulse sequences and quantitation. These applications add to the already diverse NMR toolkit and further anchor NMR as a technique that is directly applicable to meeting the requirements of MIST guidelines.
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Cooper HLR, Groves JT. Molecular probes of the mechanism of cytochrome P450. Oxygen traps a substrate radical intermediate. Arch Biochem Biophys 2011; 507:111-8. [PMID: 21075070 PMCID: PMC3041850 DOI: 10.1016/j.abb.2010.11.001] [Citation(s) in RCA: 39] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/23/2010] [Revised: 11/05/2010] [Accepted: 11/05/2010] [Indexed: 01/05/2023]
Abstract
The diagnostic substrate tetramethylcyclopropane (TMCP) has been reexamined as a substrate with three drug- and xenobiotic-metabolizing cytochrome P450 enzymes, human CYP2E1, CYP3A4 and rat CYP2B1. The major hydroxylation product in all cases was the unrearranged primary alcohol along with smaller amounts of a rearranged tertiary alcohol. Significantly, another ring-opened product, diacetone alcohol, was also observed. With CYP2E1 this product accounted for 20% of the total turnover. Diacetone alcohol also was detected as a product from TMCP with a biomimetic model catalyst, FeTMPyP, but not with a ruthenium porphyrin catalyst. Lifetimes of the intermediate radicals were determined from the ratios of rearranged and unrearranged products to be 120, 13 and 1ps for CYP2E1, CYP3A4 and CYP2B1, respectively, corresponding to rebound rates of 0.9×10(10)s(-1), 7.2×10(10)s(-1) and 1.0×10(12)s(-1). For the model iron porphyrin, FeTMPyP, a radical lifetime of 81ps and a rebound rate of 1.2×10(10)s(-1) were determined. These apparent radical lifetimes are consistent with earlier reports with a variety of CYP enzymes and radical clock substrates, however, the large amounts of diacetone alcohol with CYP2E1 and the iron porphyrin suggest that for these systems a considerable amount of the intermediate carbon radical is trapped by molecular oxygen. These results add to the view that cage escape of the intermediate carbon radical in [Fe(IV)-OH ()R] can compete with cage collapse to form a C-O bond. The results could be significant with regard to our understanding of iron-catalyzed C-H hydroxylation, the observation of P450-dependent peroxidation and the development of oxidative stress, especially for CYP2E1.
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Affiliation(s)
| | - John T. Groves
- Department of Chemistry, Princeton University, Princeton NJ 08544 USA
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Giri S, Bader A. Improved preclinical safety assessment using micro-BAL devices: the potential impact on human discovery and drug attrition. Drug Discov Today 2011; 16:382-97. [PMID: 21354326 DOI: 10.1016/j.drudis.2011.02.012] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/08/2010] [Revised: 01/11/2011] [Accepted: 02/21/2011] [Indexed: 02/07/2023]
Abstract
Hepatotoxicity is often unpredictable in the early phase of drug discovery and leads to drug attrition in preclinical and clinical development. Here, we discuss the conventional preclinical liver models that do not mimic in vivo livers. We focus on key components such as new sources of hepatocyte-derived human stem cells, enhanced direct oxygenation, defined biocompatibility nanoscaffolds, organotypical cellular models, dynamic culture, and metabolite status inside and outside the cell for effective configuration for the development of a bioartificial liver (BAL) device to mimic the in vivo liver microenvironment. The potential for development of BAL devices could open up new avenues in: (i) hepatotoxicity assessment for selecting drug candidates during preclinical screening; and (ii) therapeutic approaches for liver cell therapy at the clinical stage.
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Affiliation(s)
- Shibashish Giri
- Centre for Biotechnology and Biomedicine, Department of Cell Techniques and Applied Stem Cell Biology, University of Leipzig, Deutscher Platz 5, D-04103 Leipzig, Germany.
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Approaches for the rapid identification of drug metabolites in early clinical studies. Bioanalysis 2011; 3:197-213. [DOI: 10.4155/bio.10.186] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022] Open
Abstract
Understanding the metabolism of a novel drug candidate in drug discovery and drug development is as important today as it was 30 years ago. What has changed in this period is the technology available for proficient metabolite characterization from complex biological sources. High-efficiency chromatography, sensitive MS and information-rich NMR spectroscopy are approaches that are now commonplace in the modern laboratory. These advancements in analytical technology have led to unequivocal metabolite identification often being performed at the earliest opportunity, following the first dose to man. For this reason an alternative approach is to shift from predicting and extrapolating possible human metabolism from in silico and nonclinical sources, to actual characterization at steady state within early clinical trials. This review provides an overview of modern approaches for characterizing drug metabolites in these early clinical studies. Since much of this progress has come from technology development over the years, the review is concluded with a forward-looking perspective on how this progression may continue into the next decade.
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Gao H, Deng S, Obach RS. A Simple Liquid Chromatography-Tandem Mass Spectrometry Method to Determine Relative Plasma Exposures of Drug Metabolites across Species for Metabolite Safety Assessments. Drug Metab Dispos 2010; 38:2147-56. [DOI: 10.1124/dmd.110.034637] [Citation(s) in RCA: 67] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/29/2022] Open
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Abstract
Regulatory guidelines on MIST were initially established in 2005 and finalized in 2008 by the US FDA and this has led to much discussion and debate on how to apply these recommendations in today’s resource-constrained pharmaceutical environment. There are four aspects of MIST that impact on the field of bioanalysis: definition of a disproportionate human metabolite, establishment of nonclinical (animal) safety coverage for important human metabolites, degree of rigor in validation of bioanalytical methods to quantify metabolites when synthetic standards are available, and semiquantitation of metabolites when synthetic standards are not available. In this manuscript, each of these points has been addressed from a pharmaceutical industry standpoint, including a perspective on the necessary convergence of the fields of metabolite safety testing and bioanalysis.
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A radiocalibration method with pseudo internal standard to estimate circulating metabolite concentrations. Bioanalysis 2010; 2:1195-210. [DOI: 10.4155/bio.10.81] [Citation(s) in RCA: 35] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022] Open
Abstract
Background: It has become important for metabolism scientists to identify and quantify prominent circulating human metabolites in order to develop a metabolite safety-qualification package that meets regulatory standards. Often these metabolites cannot be analyzed using traditional bioanalytical methods because a standard is not available. Results: A radiocalibration method is described that can estimate circulating metabolite concentrations in nonradioactive human and animal plasma. The key to this method is application of a pseudo internal standard (PIS) that is present in both radioactive reference and nonradioactive (i.e., unknown) samples. Metabolite exposure in the unknown samples is estimated from measured PIS exposure using a relative molar ratio established between the metabolite and PIS (usually parent drug). Conclusion: Two case studies demonstrate that the method can be used to establish human metabolite safety coverage in animal plasma and method validation is demonstrated by comparing estimated metabolite concentrations in human plasma with concentrations obtained directly using a metabolite calibration curve.
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