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Li Y, Lan X, Wang S, Cui Y, Song S, Zhou H, Li Q, Dai L, Zhang J. Serial five-membered lactone ring ions in the treatment of Alzheimer's diseases-comprehensive profiling of arctigenin metabolites and network analysis. Front Pharmacol 2022; 13:1065654. [PMID: 36605392 PMCID: PMC9807626 DOI: 10.3389/fphar.2022.1065654] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/10/2022] [Accepted: 12/01/2022] [Indexed: 12/24/2022] Open
Abstract
Arctigenin is a phenylpropanoid dibenzylbutyro lactone lignan compound with multiple biological functions. Previous studies have shown that arctigenin have neuroprotective effects in Alzheimer's disease (AD) models both in vivo and in vitro; however, its metabolism in vivo has not been studied. Most traditional analytical methods only partially characterize drug metabolite prototypes, so there is an urgent need for a research strategy that can fully characterize drug metabolites. In the present study, ions fishing with a serial five-membered lactone ring as a fishhook strategy based on ultrahigh-performance liquid chromatography-Q-Exactive Orbitrap mass spectrometry (UHPLC-Q-Exactive Orbitrap MS) was utilised to characterise the metabolism of arctigenin, and the establishment of this strategy also solved the challenge of creating a comprehensive metabolic profile of neolignan. Based on the proposed strategy, a total of 105 metabolites were detected and characterised, 76 metabolites of which were found in rats and 49 metabolites in liver microsomes. These metabolites were postulated to be produced through oxidation, reduction, hydrolysis, and complex reactions. Subsequently, network pharmacology was utilized to elucidate the mechanism of arctigenin and its main metabolites against Alzheimer's disease, screening 381 potential targets and 20 major signaling pathways. The study on the comprehensive metabolism of arctigenin provides a holistic metabolic profile, which will help to better understand the mechanism of arctigenin in the treatment of Alzheimer's disease (AD) and also provide a basis for the safe administration of arctigenin.
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Affiliation(s)
- Yanan Li
- School of Pharmacy, Binzhou Medical University, Yantai, China,School of Pharmacy, Shandong University of Traditional Chinese Medicine, Jinan, China
| | - Xianming Lan
- School of Pharmacy, Binzhou Medical University, Yantai, China
| | - Shaoping Wang
- School of Pharmacy, Binzhou Medical University, Yantai, China
| | - Yifang Cui
- School of Pharmacy, Binzhou Medical University, Yantai, China,School of Pharmacy, Shandong University of Traditional Chinese Medicine, Jinan, China
| | - Shuyi Song
- School of Pharmacy, Binzhou Medical University, Yantai, China
| | - Hongyan Zhou
- School of Pharmacy, Binzhou Medical University, Yantai, China,School of Pharmacy, Shandong University of Traditional Chinese Medicine, Jinan, China
| | - Qiyan Li
- Shandong Provincial Institute for Food and Drug Control, Jinan, China,*Correspondence: Jiayu Zhang, ; Long Dai, ; Qiyan Li,
| | - Long Dai
- School of Pharmacy, Binzhou Medical University, Yantai, China,*Correspondence: Jiayu Zhang, ; Long Dai, ; Qiyan Li,
| | - Jiayu Zhang
- School of Pharmacy, Binzhou Medical University, Yantai, China,*Correspondence: Jiayu Zhang, ; Long Dai, ; Qiyan Li,
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2
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Hannon SL, Ding X. Assessing cytochrome P450 function using genetically engineered mouse models. ADVANCES IN PHARMACOLOGY (SAN DIEGO, CALIF.) 2022; 95:253-284. [PMID: 35953157 PMCID: PMC10544722 DOI: 10.1016/bs.apha.2022.05.008] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
Abstract
The ability to knock out and/or humanize different genes in experimental animals, globally or in cell- and tissue-specific patterns, has revolutionized scientific research in many areas. Genetically engineered mouse models, including knockout models, transgenic models, and humanized models, have played important roles in revealing the in vivo functions of various cytochrome P450 (CYP) enzymes. These functions are very diverse, ranging from the biotransformation of drugs and other xenobiotics, events that often dictate their pharmacokinetic or toxicokinetic properties and the associated therapeutic or adverse actions, to the metabolism of endogenous compounds, such as steroid hormones and other bioactive substances, that may determine susceptibility to many diseases, such as cancer and metabolic diseases. In this review, we provide a comprehensive list of Cyp-knockout, human CYP-transgenic, and CYP-humanized mouse models that target genes in the CYP1-4 gene families, and highlight their utility in assessing the in vivo metabolism, bioactivation, and toxicity of various xenobiotic compounds, including therapeutic agents and chemical carcinogens. We aim to showcase the advantages of utilizing these mouse models for in vivo drug metabolism and toxicology studies, and to encourage and facilitate greater utility of engineered mouse models to further improve our knowledge of the in vivo functions of various P450 enzymes, which is integral to our ability to develop safer and more effective therapeutics and to identify individuals predisposed to adverse drug reactions or environmental diseases.
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Affiliation(s)
- Sarrah L Hannon
- Department of Pharmacology and Toxicology, Ken R. Coit College of Pharmacy, The University of Arizona, Tucson, AZ, United States
| | - Xinxin Ding
- Department of Pharmacology and Toxicology, Ken R. Coit College of Pharmacy, The University of Arizona, Tucson, AZ, United States.
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3
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Honkakoski P. Searching for CAR modulators. Drug Metab Dispos 2022; 50:1002-1009. [DOI: 10.1124/dmd.121.000482] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/22/2021] [Accepted: 02/01/2022] [Indexed: 11/22/2022] Open
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Hammer H, Schmidt F, Marx-Stoelting P, Pötz O, Braeuning A. Cross-species analysis of hepatic cytochrome P450 and transport protein expression. Arch Toxicol 2021; 95:117-133. [PMID: 33150952 PMCID: PMC7811513 DOI: 10.1007/s00204-020-02939-4] [Citation(s) in RCA: 24] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/04/2020] [Accepted: 10/20/2020] [Indexed: 12/19/2022]
Abstract
Most drugs and xenobiotics are metabolized in the liver. Amongst others, different cytochrome P450 (CYP) enzymes catalyze the metabolic conversion of foreign compounds, and various transport proteins are engaged in the excretion of metabolites from the hepatocytes. Inter-species and inter-individual differences in the hepatic levels and activities of drug-metabolizing enzymes and transporters result from genetic as well as from environmental factors, and play a decisive role in determining the pharmacokinetic properties of a compound in a given test system. To allow for a meaningful comparison of results from metabolism studies, it is, therefore, of utmost importance to know about the specific metabolic properties of the test systems, especially about the levels of metabolic enzymes such as the CYPs. Using a targeted proteomics approach, we, therefore, compared the hepatic levels of important CYP enzymes and transporters in different experimental systems in vivo and in vitro, namely Wistar rats, C57/Bl6 mice, mice humanized for the two xeno-sensing receptors PXR (pregnane-X-receptor) and CAR (constitutive androstane receptor), mice with human hepatocyte-repopulated livers, human HepaRG hepatocarcinoma cells, primary human hepatocytes, and human liver biopsies. In addition, the effects of xenobiotic inducers of drug metabolism on CYP enzymes and transporters were analyzed in selected systems. This study for the first time presents a comprehensive overview of similarities and differences in important drug metabolism-related proteins among the different experimental models.
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Affiliation(s)
- Helen Hammer
- Signatope, Markwiesenstraße 55, 72770, Reutlingen, Germany
| | - Felix Schmidt
- Signatope, Markwiesenstraße 55, 72770, Reutlingen, Germany
| | - Philip Marx-Stoelting
- Department of Pesticides Safety, German Federal Institute for Risk Assessment, Max-Dohrn-Str. 8-10, 10589, Berlin, Germany
| | - Oliver Pötz
- Signatope, Markwiesenstraße 55, 72770, Reutlingen, Germany
| | - Albert Braeuning
- Department of Food Safety, German Federal Institute for Risk Assessment, Max-Dohrn-Str. 8-10, 10589, Berlin, Germany.
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5
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Moustaqil M, Gambin Y, Sierecki E. Biophysical Techniques for Target Validation and Drug Discovery in Transcription-Targeted Therapy. Int J Mol Sci 2020; 21:E2301. [PMID: 32225120 PMCID: PMC7178067 DOI: 10.3390/ijms21072301] [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: 02/14/2020] [Revised: 03/13/2020] [Accepted: 03/13/2020] [Indexed: 01/10/2023] Open
Abstract
In the post-genome era, pathologies become associated with specific gene expression profiles and defined molecular lesions can be identified. The traditional therapeutic strategy is to block the identified aberrant biochemical activity. However, an attractive alternative could aim at antagonizing key transcriptional events underlying the pathogenesis, thereby blocking the consequences of a disorder, irrespective of the original biochemical nature. This approach, called transcription therapy, is now rendered possible by major advances in biophysical technologies. In the last two decades, techniques have evolved to become key components of drug discovery platforms, within pharmaceutical companies as well as academic laboratories. This review outlines the current biophysical strategies for transcription manipulation and provides examples of successful applications. It also provides insights into the future development of biophysical methods in drug discovery and personalized medicine.
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Affiliation(s)
- Mehdi Moustaqil
- EMBL Australia Node in Single Molecule Science and School of Medical Sciences, UNSW Sydney, NSW 2052, Australia;
| | | | - Emma Sierecki
- EMBL Australia Node in Single Molecule Science and School of Medical Sciences, UNSW Sydney, NSW 2052, Australia;
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6
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Henderson CJ, Kapelyukh Y, Scheer N, Rode A, McLaren AW, MacLeod AK, Lin D, Wright J, Stanley LA, Wolf CR. An Extensively Humanized Mouse Model to Predict Pathways of Drug Disposition and Drug/Drug Interactions, and to Facilitate Design of Clinical Trials. Drug Metab Dispos 2019; 47:601-615. [PMID: 30910785 PMCID: PMC6505380 DOI: 10.1124/dmd.119.086397] [Citation(s) in RCA: 27] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/16/2019] [Accepted: 03/04/2019] [Indexed: 02/06/2023] Open
Abstract
Species differences in drug metabolism and disposition can confound the extrapolation of in vivo PK data to man and also profoundly compromise drug efficacy studies owing to differences in pharmacokinetics, in metabolites produced (which are often pharmacologically active), and in differential activation of the transcription factors constitutive androstane receptor (CAR) and pregnane X receptor (PXR), which regulate the expression of such enzymes as P450s and drug transporters. These differences have gained additional importance as a consequence of the use of genetically modified mouse models for drug-efficacy testing and also patient-derived xenografts to predict individual patient responses to anticancer drugs. A number of humanized mouse models for cytochrome P450s, CAR, and PXR have been reported. However, the utility of these models has been compromised by the redundancy in P450 reactions across gene families, whereby the remaining murine P450s can metabolize the compounds being tested. To remove this confounding factor and create a mouse model that more closely reflects human pathways of drug disposition, we substituted 33 murine P450s from the major gene families involved in drug disposition, together with Car and Pxr, for human CAR, PXR, CYP1A1, CYP1A2, CYP2C9, CYP2D6, CYP3A4, and CYP3A7. We also created a mouse line in which 34 P450s were deleted from the mouse genome. Using model compounds and anticancer drugs, we demonstrated how these mouse lines can be applied to predict drug-drug interactions in patients and discuss here their potential application in the more informed design of clinical trials and the personalized treatment of cancer.
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Affiliation(s)
- C J Henderson
- Systems Medicine, School of Medicine, University of Dundee, Jacqui Wood Cancer Centre, Ninewells Hospital, Dundee, United Kingdom (C.J.H., Y.K., C.R.W., A.M., K.M., D.L.); Taconic Biosciences Inc., Rensselaer, New York (N.S., A.R.); Independent Consultant, Putley, Ledbury, Herts, United Kingdom (J.W.); and Independent Consultant, Linlithgow, West Lothian, United Kingdom (L.A.S.)
| | - Y Kapelyukh
- Systems Medicine, School of Medicine, University of Dundee, Jacqui Wood Cancer Centre, Ninewells Hospital, Dundee, United Kingdom (C.J.H., Y.K., C.R.W., A.M., K.M., D.L.); Taconic Biosciences Inc., Rensselaer, New York (N.S., A.R.); Independent Consultant, Putley, Ledbury, Herts, United Kingdom (J.W.); and Independent Consultant, Linlithgow, West Lothian, United Kingdom (L.A.S.)
| | - N Scheer
- Systems Medicine, School of Medicine, University of Dundee, Jacqui Wood Cancer Centre, Ninewells Hospital, Dundee, United Kingdom (C.J.H., Y.K., C.R.W., A.M., K.M., D.L.); Taconic Biosciences Inc., Rensselaer, New York (N.S., A.R.); Independent Consultant, Putley, Ledbury, Herts, United Kingdom (J.W.); and Independent Consultant, Linlithgow, West Lothian, United Kingdom (L.A.S.)
| | - A Rode
- Systems Medicine, School of Medicine, University of Dundee, Jacqui Wood Cancer Centre, Ninewells Hospital, Dundee, United Kingdom (C.J.H., Y.K., C.R.W., A.M., K.M., D.L.); Taconic Biosciences Inc., Rensselaer, New York (N.S., A.R.); Independent Consultant, Putley, Ledbury, Herts, United Kingdom (J.W.); and Independent Consultant, Linlithgow, West Lothian, United Kingdom (L.A.S.)
| | - A W McLaren
- Systems Medicine, School of Medicine, University of Dundee, Jacqui Wood Cancer Centre, Ninewells Hospital, Dundee, United Kingdom (C.J.H., Y.K., C.R.W., A.M., K.M., D.L.); Taconic Biosciences Inc., Rensselaer, New York (N.S., A.R.); Independent Consultant, Putley, Ledbury, Herts, United Kingdom (J.W.); and Independent Consultant, Linlithgow, West Lothian, United Kingdom (L.A.S.)
| | - A K MacLeod
- Systems Medicine, School of Medicine, University of Dundee, Jacqui Wood Cancer Centre, Ninewells Hospital, Dundee, United Kingdom (C.J.H., Y.K., C.R.W., A.M., K.M., D.L.); Taconic Biosciences Inc., Rensselaer, New York (N.S., A.R.); Independent Consultant, Putley, Ledbury, Herts, United Kingdom (J.W.); and Independent Consultant, Linlithgow, West Lothian, United Kingdom (L.A.S.)
| | - D Lin
- Systems Medicine, School of Medicine, University of Dundee, Jacqui Wood Cancer Centre, Ninewells Hospital, Dundee, United Kingdom (C.J.H., Y.K., C.R.W., A.M., K.M., D.L.); Taconic Biosciences Inc., Rensselaer, New York (N.S., A.R.); Independent Consultant, Putley, Ledbury, Herts, United Kingdom (J.W.); and Independent Consultant, Linlithgow, West Lothian, United Kingdom (L.A.S.)
| | - J Wright
- Systems Medicine, School of Medicine, University of Dundee, Jacqui Wood Cancer Centre, Ninewells Hospital, Dundee, United Kingdom (C.J.H., Y.K., C.R.W., A.M., K.M., D.L.); Taconic Biosciences Inc., Rensselaer, New York (N.S., A.R.); Independent Consultant, Putley, Ledbury, Herts, United Kingdom (J.W.); and Independent Consultant, Linlithgow, West Lothian, United Kingdom (L.A.S.)
| | - L A Stanley
- Systems Medicine, School of Medicine, University of Dundee, Jacqui Wood Cancer Centre, Ninewells Hospital, Dundee, United Kingdom (C.J.H., Y.K., C.R.W., A.M., K.M., D.L.); Taconic Biosciences Inc., Rensselaer, New York (N.S., A.R.); Independent Consultant, Putley, Ledbury, Herts, United Kingdom (J.W.); and Independent Consultant, Linlithgow, West Lothian, United Kingdom (L.A.S.)
| | - C R Wolf
- Systems Medicine, School of Medicine, University of Dundee, Jacqui Wood Cancer Centre, Ninewells Hospital, Dundee, United Kingdom (C.J.H., Y.K., C.R.W., A.M., K.M., D.L.); Taconic Biosciences Inc., Rensselaer, New York (N.S., A.R.); Independent Consultant, Putley, Ledbury, Herts, United Kingdom (J.W.); and Independent Consultant, Linlithgow, West Lothian, United Kingdom (L.A.S.)
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7
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Mazzolari A, Afzal AM, Pedretti A, Testa B, Vistoli G, Bender A. Prediction of UGT-mediated Metabolism Using the Manually Curated MetaQSAR Database. ACS Med Chem Lett 2019; 10:633-638. [PMID: 30996809 DOI: 10.1021/acsmedchemlett.8b00603] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/30/2018] [Accepted: 02/12/2019] [Indexed: 11/30/2022] Open
Abstract
Even though glucuronidations are the most frequent metabolic reactions of conjugation, both in quantitative and qualitative terms, they have rather seldom been investigated using computational approaches. To fill this gap, we have used the manually collected MetaQSAR metabolic reaction database to generate two models for the prediction of UGT-mediated metabolism, both based on molecular descriptors and implementing the Random Forest algorithm. The first model predicts the occurrence of the reaction and was internally validated with a Matthew correlation coefficient (MCC) of 0.76 and an area under the ROC curve (AUC) of 0.94, and further externally validated using a test set composed of 120 additional xenobiotics (MCC of 0.70 and AUC of 0.90). The second model distinguishes between O- and N-glucuronidations and was optimized by the random undersampling procedure to improve the predictive accuracy during the internal validation, with the recall measure of the minority class increasing from 0.55 to 0.78.
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Affiliation(s)
- Angelica Mazzolari
- Dipartimento di Scienze Farmaceutiche, Facoltà di Scienze del Farmaco, Università degli Studi di Milano, Via Mangiagalli, I-20133 Milano, Italy
| | - Avid M. Afzal
- Centre for Molecular Informatics, Department of Chemistry, University of Cambridge, Lensfield Road, CB2 1EW Cambridge, U.K
| | - Alessandro Pedretti
- Dipartimento di Scienze Farmaceutiche, Facoltà di Scienze del Farmaco, Università degli Studi di Milano, Via Mangiagalli, I-20133 Milano, Italy
| | | | - Giulio Vistoli
- Dipartimento di Scienze Farmaceutiche, Facoltà di Scienze del Farmaco, Università degli Studi di Milano, Via Mangiagalli, I-20133 Milano, Italy
| | - Andreas Bender
- Centre for Molecular Informatics, Department of Chemistry, University of Cambridge, Lensfield Road, CB2 1EW Cambridge, U.K
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8
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Current Research Method in Transporter Study. ADVANCES IN EXPERIMENTAL MEDICINE AND BIOLOGY 2019; 1141:203-240. [PMID: 31571166 DOI: 10.1007/978-981-13-7647-4_4] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Abstract
Transporters play an important role in the absorption, distribution, metabolism, and excretion (ADME) of drugs. In recent years, various in vitro, in situ/ex vivo, and in vivo methods have been established for studying transporter function and drug-transporter interaction. In this chapter, the major types of in vitro models for drug transport studies comprise membrane-based assays, cell-based assays (such as primary cell cultures, immortalized cell lines), and transporter-transfected cell lines with single transporters or multiple transporters. In situ/ex vivo models comprise isolated and perfused organs or tissues. In vivo models comprise transporter gene knockout models, natural mutant animal models, and humanized animal models. This chapter would be focused on the methods for the study of drug transporters in vitro, in situ/ex vivo, and in vivo. The applications, advantages, or limitations of each model and emerging technologies are also mentioned in this chapter.
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9
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Bissig KD, Han W, Barzi M, Kovalchuk N, Ding L, Fan X, Pankowicz FP, Zhang QY, Ding X. P450-Humanized and Human Liver Chimeric Mouse Models for Studying Xenobiotic Metabolism and Toxicity. Drug Metab Dispos 2018; 46:1734-1744. [PMID: 30093418 DOI: 10.1124/dmd.118.083303] [Citation(s) in RCA: 39] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/25/2018] [Accepted: 08/03/2018] [Indexed: 01/01/2023] Open
Abstract
Preclinical evaluation of drug candidates in experimental animal models is an essential step in drug development. Humanized mouse models have emerged as a promising alternative to traditional animal models. The purpose of this mini-review is to provide a brief survey of currently available mouse models for studying human xenobiotic metabolism. Here, we describe both genetic humanization and human liver chimeric mouse models, focusing on the advantages and limitations while outlining their key features and applications. Although this field of biomedical science is relatively young, these humanized mouse models have the potential to transform preclinical drug testing and eventually lead to a more cost-effective and rapid development of new therapies.
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Affiliation(s)
- Karl-Dimiter Bissig
- Baylor College of Medicine, Houston, Texas (K.-D.B., M.B., F.P.P.); and Department of Pharmacology and Toxicology, College of Pharmacy, University of Arizona, Tucson, Arizona (W.H., N.K., L.D., X.F., Q.-Y.Z., X.D.)
| | - Weiguo Han
- Baylor College of Medicine, Houston, Texas (K.-D.B., M.B., F.P.P.); and Department of Pharmacology and Toxicology, College of Pharmacy, University of Arizona, Tucson, Arizona (W.H., N.K., L.D., X.F., Q.-Y.Z., X.D.)
| | - Mercedes Barzi
- Baylor College of Medicine, Houston, Texas (K.-D.B., M.B., F.P.P.); and Department of Pharmacology and Toxicology, College of Pharmacy, University of Arizona, Tucson, Arizona (W.H., N.K., L.D., X.F., Q.-Y.Z., X.D.)
| | - Nataliia Kovalchuk
- Baylor College of Medicine, Houston, Texas (K.-D.B., M.B., F.P.P.); and Department of Pharmacology and Toxicology, College of Pharmacy, University of Arizona, Tucson, Arizona (W.H., N.K., L.D., X.F., Q.-Y.Z., X.D.)
| | - Liang Ding
- Baylor College of Medicine, Houston, Texas (K.-D.B., M.B., F.P.P.); and Department of Pharmacology and Toxicology, College of Pharmacy, University of Arizona, Tucson, Arizona (W.H., N.K., L.D., X.F., Q.-Y.Z., X.D.)
| | - Xiaoyu Fan
- Baylor College of Medicine, Houston, Texas (K.-D.B., M.B., F.P.P.); and Department of Pharmacology and Toxicology, College of Pharmacy, University of Arizona, Tucson, Arizona (W.H., N.K., L.D., X.F., Q.-Y.Z., X.D.)
| | - Francis P Pankowicz
- Baylor College of Medicine, Houston, Texas (K.-D.B., M.B., F.P.P.); and Department of Pharmacology and Toxicology, College of Pharmacy, University of Arizona, Tucson, Arizona (W.H., N.K., L.D., X.F., Q.-Y.Z., X.D.)
| | - Qing-Yu Zhang
- Baylor College of Medicine, Houston, Texas (K.-D.B., M.B., F.P.P.); and Department of Pharmacology and Toxicology, College of Pharmacy, University of Arizona, Tucson, Arizona (W.H., N.K., L.D., X.F., Q.-Y.Z., X.D.)
| | - Xinxin Ding
- Baylor College of Medicine, Houston, Texas (K.-D.B., M.B., F.P.P.); and Department of Pharmacology and Toxicology, College of Pharmacy, University of Arizona, Tucson, Arizona (W.H., N.K., L.D., X.F., Q.-Y.Z., X.D.)
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10
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Volpe DA, Qosa H. Challenges with the precise prediction of ABC-transporter interactions for improved drug discovery. Expert Opin Drug Discov 2018; 13:697-707. [PMID: 29943645 DOI: 10.1080/17460441.2018.1493454] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Abstract
INTRODUCTION Given that membrane efflux transporters can influence a drug's pharmacokinetics, efficacy and safety, identifying potential substrates and inhibitors of these transporters is a critical element in the drug discovery and development process. Additionally, it is important to predict the inhibition potential of new drugs to avoid clinically significant drug interactions. The goal of preclinical studies is to characterize a new drug as a substrate or inhibitor of efflux transporters. Areas covered: This article reviews preclinical systems that are routinely utilized to determine whether a new drug is substrate or inhibitor of efflux transporters including in silico models, in vitro membrane and cell assays, and animal models. Also included is an examination of studies comparing in vitro inhibition data to clinical drug interaction outcomes. Expert opinion: While a number of models are employed to classify a drug as an efflux substrate or inhibitor, there are challenges in predicting clinical drug interactions. Improvements could be made in these predictions through a tier approach to classify new drugs, validation of preclinical assays, and refinement of threshold criteria for clinical interaction studies.
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Affiliation(s)
- Donna A Volpe
- a Office of Clinical Pharmacology, Center for Drug Evaluation and Research , Food and Drug Administration , Silver Spring , MD , USA
| | - Hisham Qosa
- a Office of Clinical Pharmacology, Center for Drug Evaluation and Research , Food and Drug Administration , Silver Spring , MD , USA
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11
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Li J, Dawson PA. Animal models to study bile acid metabolism. Biochim Biophys Acta Mol Basis Dis 2018; 1865:895-911. [PMID: 29782919 DOI: 10.1016/j.bbadis.2018.05.011] [Citation(s) in RCA: 129] [Impact Index Per Article: 21.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/27/2018] [Revised: 05/11/2018] [Accepted: 05/14/2018] [Indexed: 12/19/2022]
Abstract
The use of animal models, particularly genetically modified mice, continues to play a critical role in studying the relationship between bile acid metabolism and human liver disease. Over the past 20 years, these studies have been instrumental in elucidating the major pathways responsible for bile acid biosynthesis and enterohepatic cycling, and the molecular mechanisms regulating those pathways. This work also revealed bile acid differences between species, particularly in the composition, physicochemical properties, and signaling potential of the bile acid pool. These species differences may limit the ability to translate findings regarding bile acid-related disease processes from mice to humans. In this review, we focus primarily on mouse models and also briefly discuss dietary or surgical models commonly used to study the basic mechanisms underlying bile acid metabolism. Important phenotypic species differences in bile acid metabolism between mice and humans are highlighted.
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Affiliation(s)
- Jianing Li
- Department of Pediatrics, Division of Gastroenterology, Hepatology, and Nutrition, Emory University, Atlanta, GA 30322, United States
| | - Paul A Dawson
- Department of Pediatrics, Division of Gastroenterology, Hepatology, and Nutrition, Emory University, Atlanta, GA 30322, United States.
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12
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Lee SC, Arya V, Yang X, Volpe DA, Zhang L. Evaluation of transporters in drug development: Current status and contemporary issues. Adv Drug Deliv Rev 2017; 116:100-118. [PMID: 28760687 DOI: 10.1016/j.addr.2017.07.020] [Citation(s) in RCA: 54] [Impact Index Per Article: 7.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/12/2017] [Revised: 07/19/2017] [Accepted: 07/26/2017] [Indexed: 01/22/2023]
Abstract
Transporters govern the access of molecules to cells or their exit from cells, thereby controlling the overall distribution of drugs to their intracellular site of action. Clinically relevant drug-drug interactions mediated by transporters are of increasing interest in drug development. Drug transporters, acting alone or in concert with drug metabolizing enzymes, can play an important role in modulating drug absorption, distribution, metabolism and excretion, thus affecting the pharmacokinetics and/or pharmacodynamics of a drug. The drug interaction guidance documents from regulatory agencies include various decision criteria that may be used to predict the need for in vivo assessment of transporter-mediated drug-drug interactions. Regulatory science research continues to assess the prediction performances of various criteria as well as to examine the strength and limitations of each prediction criterion to foster discussions related to harmonized decision criteria that may be used to facilitate global drug development. This review discusses the role of transporters in drug development with a focus on methodologies in assessing transporter-mediated drug-drug interactions, challenges in both in vitro and in vivo assessments of transporters, and emerging transporter research areas including biomarkers, assessment of tissue concentrations, and effect of diseases on transporters.
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Affiliation(s)
- Sue-Chih Lee
- Office of Clinical Pharmacology, Office of Translational Sciences, Center for Drug Evaluation and Research, U.S. Food and Drug Administration, Silver Spring, MD, USA
| | - Vikram Arya
- Office of Clinical Pharmacology, Office of Translational Sciences, Center for Drug Evaluation and Research, U.S. Food and Drug Administration, Silver Spring, MD, USA
| | - Xinning Yang
- Office of Clinical Pharmacology, Office of Translational Sciences, Center for Drug Evaluation and Research, U.S. Food and Drug Administration, Silver Spring, MD, USA
| | - Donna A Volpe
- Office of Clinical Pharmacology, Office of Translational Sciences, Center for Drug Evaluation and Research, U.S. Food and Drug Administration, Silver Spring, MD, USA
| | - Lei Zhang
- Office of Clinical Pharmacology, Office of Translational Sciences, Center for Drug Evaluation and Research, U.S. Food and Drug Administration, Silver Spring, MD, USA.
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Aryl hydrocarbon receptor (AHR): "pioneer member" of the basic-helix/loop/helix per-Arnt-sim (bHLH/PAS) family of "sensors" of foreign and endogenous signals. Prog Lipid Res 2017; 67:38-57. [PMID: 28606467 DOI: 10.1016/j.plipres.2017.06.001] [Citation(s) in RCA: 167] [Impact Index Per Article: 23.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/17/2017] [Revised: 05/05/2017] [Accepted: 06/05/2017] [Indexed: 12/21/2022]
Abstract
The basic-helix/loop/helix per-Arnt-sim (bHLH/PAS) family comprises many transcription factors, found throughout all three kingdoms of life; bHLH/PAS members "sense" innumerable intracellular and extracellular "signals" - including endogenous compounds, foreign chemicals, gas molecules, redox potential, photons (light), gravity, heat, and osmotic pressure. These signals then initiate downstream signaling pathways involved in responding to that signal. The term "PAS", abbreviation for "per-Arnt-sim" was first coined in 1991. Although the mouse Arnt gene was not identified until 1991, evidence of its co-transcriptional binding partner, aryl hydrocarbon receptor (AHR), was first reported in 1974 as a "sensor" of foreign chemicals, up-regulating cytochrome P450 family 1 (CYP1) and other enzyme activities that usually metabolize the signaling chemical. Within a few years, AHR was proposed also to participate in inflammation. The mouse [Ah] locus was shown (1973-1989) to be relevant to chemical carcinogenesis, mutagenesis, toxicity and teratogenesis, the mouse Ahr gene was cloned in 1992, and the first Ahr(-/-) knockout mouse line was reported in 1995. After thousands of studies from the early 1970s to present day, we now realize that AHR participates in dozens of signaling pathways involved in critical-life processes, affecting virtually every organ and cell-type in the animal, including many invertebrates.
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Clinical Exposure Boost Predictions by Integrating Cytochrome P450 3A4-Humanized Mouse Studies With PBPK Modeling. J Pharm Sci 2016; 105:1398-404. [PMID: 27019957 DOI: 10.1016/j.xphs.2016.01.021] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/10/2015] [Revised: 01/19/2016] [Accepted: 01/20/2016] [Indexed: 01/01/2023]
Abstract
NVS123 is a poorly water-soluble protease 56 inhibitor in clinical development. Data from in vitro hepatocyte studies suggested that NVS123 is mainly metabolized by CYP3A4. As a consequence of limited solubility, NVS123 therapeutic plasma exposures could not be achieved even with high doses and optimized formulations. One approach to overcome NVS123 developability issues was to increase plasma exposure by coadministrating it with an inhibitor of CYP3A4 such as ritonavir. A clinical boost effect was predicted by using physiologically based pharmacokinetic (PBPK) modeling. However, initial boost predictions lacked sufficient confidence because a key parameter, fraction of drug metabolized by CYP3A4 (fmCYP3A4), could not be estimated with accuracy on account of disconnects between in vitro and in vivo preclinical data. To accurately estimate fmCYP3A4 in human, an in vivo boost effect study was conducted using CYP3A4-humanized mouse model which showed a 33- to 56-fold exposure boost effect. Using a top-down approach, human fmCYP3A4 for NVS123 was estimated to be very high and included in the human PBPK modeling to support subsequent clinical study design. The combined use of the in vivo boost study in CYP3A4-humanized mouse model mice along with PBPK modeling accurately predicted the clinical outcome and identified a significant NVS123 exposure boost (∼42-fold increase) with ritonavir.
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15
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Takahashi S, Fukami T, Masuo Y, Brocker CN, Xie C, Krausz KW, Wolf CR, Henderson CJ, Gonzalez FJ. Cyp2c70 is responsible for the species difference in bile acid metabolism between mice and humans. J Lipid Res 2016; 57:2130-2137. [PMID: 27638959 PMCID: PMC5321228 DOI: 10.1194/jlr.m071183] [Citation(s) in RCA: 196] [Impact Index Per Article: 24.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/26/2016] [Revised: 09/16/2016] [Indexed: 12/19/2022] Open
Abstract
Bile acids are synthesized from cholesterol in the liver and subjected to multiple metabolic biotransformations in hepatocytes, including oxidation by cytochromes P450 (CYPs) and conjugation with taurine, glycine, glucuronic acid, and sulfate. Mice and rats can hydroxylate chenodeoxycholic acid (CDCA) at the 6β-position to form α-muricholic acid (MCA) and ursodeoxycholic acid (UDCA) to form β-MCA. However, MCA is not formed in humans to any appreciable degree and the mechanism for this species difference is not known. Comparison of several Cyp-null mouse lines revealed that α-MCA and β-MCA were not detected in the liver samples from Cyp2c-cluster null (Cyp2c-null) mice. Global bile acid analysis further revealed the absence of MCAs and their conjugated derivatives, and high concentrations of CDCA and UDCA in Cyp2c-null mouse cecum and feces. Analysis of recombinant CYPs revealed that α-MCA and β-MCA were produced by oxidation of CDCA and UDCA by Cyp2c70, respectively. CYP2C9-humanized mice have similar bile acid metabolites as the Cyp2c-null mice, indicating that human CYP2C9 does not oxidize CDCA and UDCA, thus explaining the species differences in production of MCA. Because humans do not produce MCA, they lack tauro-β-MCA, a farnesoid X receptor antagonist in mouse that modulates obesity, insulin resistance, and hepatosteatosis.
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Affiliation(s)
- Shogo Takahashi
- Laboratory of Metabolism, National Cancer Institute, National Institutes of Health, Bethesda, MD 20892
| | - Tatsuki Fukami
- Laboratory of Metabolism, National Cancer Institute, National Institutes of Health, Bethesda, MD 20892
| | - Yusuke Masuo
- Laboratory of Metabolism, National Cancer Institute, National Institutes of Health, Bethesda, MD 20892
| | - Chad N Brocker
- Laboratory of Metabolism, National Cancer Institute, National Institutes of Health, Bethesda, MD 20892
| | - Cen Xie
- Laboratory of Metabolism, National Cancer Institute, National Institutes of Health, Bethesda, MD 20892
| | - Kristopher W Krausz
- Laboratory of Metabolism, National Cancer Institute, National Institutes of Health, Bethesda, MD 20892
| | - C Roland Wolf
- Division of Cancer, School of Medicine, Jacqui Wood Cancer Centre, University of Dundee, Ninewells Hospital, Dundee DD1 9SY, United Kingdom
| | - Colin J Henderson
- Division of Cancer, School of Medicine, Jacqui Wood Cancer Centre, University of Dundee, Ninewells Hospital, Dundee DD1 9SY, United Kingdom
| | - Frank J Gonzalez
- Laboratory of Metabolism, National Cancer Institute, National Institutes of Health, Bethesda, MD 20892.
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16
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Song F, Hu Y, Jiang H, Smith DE. Species Differences in Human and Rodent PEPT2-Mediated Transport of Glycylsarcosine and Cefadroxil in Pichia Pastoris Transformants. Drug Metab Dispos 2016; 45:130-136. [PMID: 27836942 DOI: 10.1124/dmd.116.073320] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/29/2016] [Accepted: 11/09/2016] [Indexed: 11/22/2022] Open
Abstract
The proton-coupled oligopeptide transporter PEPT2 (SLC15A2) plays an important role in the disposition of di/tripeptides and peptide-like drugs in kidney and brain. However, unlike PEPT1 (SLC15A1), there is little information about species differences in the transport of PEPT2-mediated substrates. The purpose of this study was to determine whether PEPT2 exhibited a species-dependent uptake of glycylsarcosine (GlySar) and cefadroxil using yeast Pichia pastoris cells expressing cDNA from human, mouse, and rat. In such a system, the functional activity of PEPT2 was evaluated with [3H]GlySar as a function of time, pH, substrate concentration, and specificity, and with [3H]cefadroxil as a function of concentration. We observed that the uptake of GlySar was pH-dependent with an optimal uptake at pH 6.5 for all three species. Moreover, GlySar showed saturable uptake kinetics, with Km values in human (150.6 µM) > mouse (42.8 µM) ≈ rat (36.0 µM). The PEPT2-mediated uptake of GlySar in yeast transformants was specific, being inhibited by di/tripeptides and peptide-like drugs, but not by amino acids and nonsubstrate compounds. Cefadroxil also showed a saturable uptake profile in all three species, with Km values in human (150.8 μM) > mouse (15.6 μM) ≈ rat (11.9 μM). These findings demonstrated that the PEPT2-mediated uptake of GlySar and cefadroxil was specific, species dependent, and saturable. Furthermore, based on the Km values, mice appeared similar to rats but both were less than optimal as animal models in evaluating the renal reabsorption and pharmacokinetics of peptides and peptide-like drugs in humans.
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Affiliation(s)
- Feifeng Song
- Department of Pharmaceutical Sciences, College of Pharmacy, University of Michigan, Ann Arbor, Michigan (Y.H., D.E.S.); and Laboratory of Pharmaceutical Analysis and Drug Metabolism, College of Pharmaceutical Sciences, Zhejiang University, Hangzhou, Zhejiang, China (F.S., H.J.)
| | - Yongjun Hu
- Department of Pharmaceutical Sciences, College of Pharmacy, University of Michigan, Ann Arbor, Michigan (Y.H., D.E.S.); and Laboratory of Pharmaceutical Analysis and Drug Metabolism, College of Pharmaceutical Sciences, Zhejiang University, Hangzhou, Zhejiang, China (F.S., H.J.)
| | - Huidi Jiang
- Department of Pharmaceutical Sciences, College of Pharmacy, University of Michigan, Ann Arbor, Michigan (Y.H., D.E.S.); and Laboratory of Pharmaceutical Analysis and Drug Metabolism, College of Pharmaceutical Sciences, Zhejiang University, Hangzhou, Zhejiang, China (F.S., H.J.)
| | - David E Smith
- Department of Pharmaceutical Sciences, College of Pharmacy, University of Michigan, Ann Arbor, Michigan (Y.H., D.E.S.); and Laboratory of Pharmaceutical Analysis and Drug Metabolism, College of Pharmaceutical Sciences, Zhejiang University, Hangzhou, Zhejiang, China (F.S., H.J.)
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17
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Bhatia S, Daschkey S, Lang F, Borkhardt A, Hauer J. Mouse models for pre-clinical drug testing in leukemia. Expert Opin Drug Discov 2016; 11:1081-1091. [DOI: 10.1080/17460441.2016.1229297] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/28/2022]
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18
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Humanizing the zebrafish liver shifts drug metabolic profiles and improves pharmacokinetics of CYP3A4 substrates. Arch Toxicol 2016; 91:1187-1197. [PMID: 27485346 DOI: 10.1007/s00204-016-1789-5] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/11/2016] [Accepted: 07/05/2016] [Indexed: 12/29/2022]
Abstract
Understanding and predicting whether new drug candidates will be safe in the clinic is a critical hurdle in pharmaceutical development, that relies in part on absorption, distribution, metabolism, excretion and toxicology studies in vivo. Zebrafish is a relatively new model system for drug metabolism and toxicity studies, offering whole organism screening coupled with small size and potential for high-throughput screening. Through toxicity and absorption analyses of a number of drugs, we find that zebrafish is generally predictive of drug toxicity, although assay outcomes are influenced by drug lipophilicity which alters drug uptake. In addition, liver microsome assays reveal specific differences in metabolism of compounds between human and zebrafish livers, likely resulting from the divergence of the cytochrome P450 superfamily between species. To reflect human metabolism more accurately, we generated a transgenic "humanized" zebrafish line that expresses the major human phase I detoxifying enzyme, CYP3A4, in the liver. Here, we show that this humanized line shows an elevated metabolism of CYP3A4-specific substrates compared to wild-type zebrafish. The generation of this first described humanized zebrafish liver suggests such approaches can enhance the accuracy of the zebrafish model for toxicity prediction.
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19
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Breyer MD, Look AT, Cifra A. From bench to patient: model systems in drug discovery. Dis Model Mech 2016; 8:1171-4. [PMID: 26438689 PMCID: PMC4610244 DOI: 10.1242/dmm.023036] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023] Open
Abstract
Model systems, including laboratory animals, microorganisms, and cell- and tissue-based systems, are central to the discovery and development of new and better drugs for the treatment of human disease. In this issue, Disease Models & Mechanisms launches a Special Collection that illustrates the contribution of model systems to drug discovery and optimisation across multiple disease areas. This collection includes reviews, Editorials, interviews with leading scientists with a foot in both academia and industry, and original research articles reporting new and important insights into disease therapeutics. This Editorial provides a summary of the collection's current contents, highlighting the impact of multiple model systems in moving new discoveries from the laboratory bench to the patients' bedsides. Drug Discovery Collection: This Editorial introduces the new DMM Special Collection entitled ‘From bench to patient: model systems in drug discovery’, providing a summary of its contents and highlighting the impact of multiple model systems in moving new discoveries from bench to patient.
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Affiliation(s)
| | - A Thomas Look
- Department of Pediatric Oncology, Dana-Farber Cancer Institute and Harvard Medical School, Boston, MA 01864, USA
| | - Alessandra Cifra
- Disease Models & Mechanisms, The Company of Biologists, Bidder Building, Station Road, Histon, Cambridgeshire, CB24 9LF, UK
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20
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Peters SA, Jones CR, Ungell AL, Hatley OJD. Predicting Drug Extraction in the Human Gut Wall: Assessing Contributions from Drug Metabolizing Enzymes and Transporter Proteins using Preclinical Models. Clin Pharmacokinet 2016; 55:673-96. [PMID: 26895020 PMCID: PMC4875961 DOI: 10.1007/s40262-015-0351-6] [Citation(s) in RCA: 58] [Impact Index Per Article: 7.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
Abstract
Intestinal metabolism can limit oral bioavailability of drugs and increase the risk of drug interactions. It is therefore important to be able to predict and quantify it in drug discovery and early development. In recent years, a plethora of models-in vivo, in situ and in vitro-have been discussed in the literature. The primary objective of this review is to summarize the current knowledge in the quantitative prediction of gut-wall metabolism. As well as discussing the successes of current models for intestinal metabolism, the challenges in the establishment of good preclinical models are highlighted, including species differences in the isoforms; regional abundances and activities of drug metabolizing enzymes; the interplay of enzyme-transporter proteins; and lack of knowledge on enzyme abundances and availability of empirical scaling factors. Due to its broad specificity and high abundance in the intestine, CYP3A is the enzyme that is frequently implicated in human gut metabolism and is therefore the major focus of this review. A strategy to assess the impact of gut wall metabolism on oral bioavailability during drug discovery and early development phases is presented. Current gaps in the mechanistic understanding and the prediction of gut metabolism are highlighted, with suggestions on how they can be overcome in the future.
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Affiliation(s)
- Sheila Annie Peters
- Translational Quantitative Pharmacology, BioPharma, R&D Global Early Development, Merck KGaA, Frankfurter Str. 250, F130/005, 64293, Darmstadt, Germany.
| | | | - Anna-Lena Ungell
- Investigative ADME, Non-Clinical Development, UCB New Medicines, BioPharma SPRL, Braine l'Alleud, Belgium
| | - Oliver J D Hatley
- Simcyp Limited (A Certara Company), Blades Enterprise Centre, Sheffield, UK
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21
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Day CP, Merlino G, Van Dyke T. Preclinical mouse cancer models: a maze of opportunities and challenges. Cell 2015; 163:39-53. [PMID: 26406370 DOI: 10.1016/j.cell.2015.08.068] [Citation(s) in RCA: 402] [Impact Index Per Article: 44.7] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/20/2015] [Indexed: 12/20/2022]
Abstract
Significant advances have been made in developing novel therapeutics for cancer treatment, and targeted therapies have revolutionized the treatment of some cancers. Despite the promise, only about five percent of new cancer drugs are approved, and most fail due to lack of efficacy. The indication is that current preclinical methods are limited in predicting successful outcomes. Such failure exacts enormous cost, both financial and in the quality of human life. This Primer explores the current status, promise, and challenges of preclinical evaluation in advanced mouse cancer models and briefly addresses emerging models for early-stage preclinical development.
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Affiliation(s)
- Chi-Ping Day
- Laboratory of Cancer Biology and Genetics, Center for Cancer Research, National Cancer Institute, NIH, Bethesda, MD, USA
| | - Glenn Merlino
- Laboratory of Cancer Biology and Genetics, Center for Cancer Research, National Cancer Institute, NIH, Bethesda, MD, USA.
| | - Terry Van Dyke
- Center for Advanced Preclinical Research, Center for Cancer Research, National Cancer Institute, NIH, Bethesda, MD, USA.
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22
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Abstract
Attrition due to nonclinical safety represents a major issue for the productivity of pharmaceutical research and development (R&D) organizations, especially during the compound optimization stages of drug discovery and the early stages of clinical development. Focusing on decreasing nonclinical safety-related attrition is not a new concept, and various approaches have been experimented with over the last two decades. Front-loading testing funnels in Discovery with in vitro toxicity assays designed to rapidly identify unfavorable molecules was the approach adopted by most pharmaceutical R&D organizations a few years ago. However, this approach has also a non-negligible opportunity cost. Hence, significant refinements to the "fail early, fail often" paradigm have been proposed recently to reflect the complexity of accurately categorizing compounds with early data points without taking into account other important contextual aspects, in particular efficacious systemic and tissue exposures. This review provides an overview of toxicology approaches and models that can be used in pharmaceutical Discovery at the series/lead identification and lead optimization stages to guide and inform chemistry efforts, as well as a personal view on how to best use them to meet nonclinical safety-related attrition objectives consistent with a sustainable pharmaceutical R&D model. The scope of this review is limited to small molecules, as large molecules are associated with challenges that are quite different. Finally, a perspective on how several emerging technologies may impact toxicity evaluation is also provided.
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Affiliation(s)
- Eric A G Blomme
- Global Preclinical Safety, AbbVie Inc. , 1 North Waukegan Road, North Chicago, Illinois 60064, United States
| | - Yvonne Will
- Drug Safety Research and Development, Pfizer , Eastern Point Road, Groton, Connecticut 06340, United States
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23
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Abstract
A prerequisite for a successful target-based drug discovery program is a robust data set that increases confidence in the validation of the molecular target and the therapeutic approach. Given the significant time and resource investment required to carry a drug to market, early selection of targets that can be modulated safely and effectively forms the basis for a strong portfolio and pipeline. In this article we present some of the more useful scientific approaches that can be applied toward the validation of ion channel targets, a molecular family with a history of clinical success in therapeutic areas such as cardiovascular, respiratory, pain and neuroscience.
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24
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Scheer N, Kapelyukh Y, Rode A, Oswald S, Busch D, McLaughlin LA, Lin D, Henderson CJ, Wolf CR. Defining Human Pathways of Drug Metabolism In Vivo through the Development of a Multiple Humanized Mouse Model. Drug Metab Dispos 2015; 43:1679-90. [PMID: 26265742 DOI: 10.1124/dmd.115.065656] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/22/2015] [Accepted: 08/10/2015] [Indexed: 11/22/2022] Open
Abstract
Variability in drug pharmacokinetics is a major factor in defining drug efficacy and side effects. There remains an urgent need, particularly with the growing use of polypharmacy, to obtain more informative experimental data predicting clinical outcomes. Major species differences in multiplicity, substrate specificity, and regulation of enzymes from the cytochrome P450-dependent mono-oxygenase system play a critical role in drug metabolism. To develop an in vivo model for predicting human responses to drugs, we generated a mouse, where 31 P450 genes from the Cyp2c, Cyp2d, and Cyp3a gene families were exchanged for their relevant human counterparts. The model has been improved through additional humanization for the nuclear receptors constitutive androgen receptor and pregnane X receptor that control the expression of key drug metabolizing enzymes and transporters. In this most complex humanized mouse model reported to date, the cytochromes P450 function as predicted and we illustrate how these mice can be applied to predict drug-drug interactions in humans.
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Affiliation(s)
- Nico Scheer
- Taconic Biosciences GmbH, Köln, Germany (N.S., A.R.); University Medicine of Greifswald, Center of Drug Absorption and Transport (C_DAT), Department of Clinical Pharmacology, Greifswald, Germany (S.O., D.B); and Medical Research Institute, Ninewells Hospital and Medical School, University of Dundee, Dundee, United Kingdom (Y.K., L.A.M., D.L., C.H., C.R.W)
| | - Yury Kapelyukh
- Taconic Biosciences GmbH, Köln, Germany (N.S., A.R.); University Medicine of Greifswald, Center of Drug Absorption and Transport (C_DAT), Department of Clinical Pharmacology, Greifswald, Germany (S.O., D.B); and Medical Research Institute, Ninewells Hospital and Medical School, University of Dundee, Dundee, United Kingdom (Y.K., L.A.M., D.L., C.H., C.R.W)
| | - Anja Rode
- Taconic Biosciences GmbH, Köln, Germany (N.S., A.R.); University Medicine of Greifswald, Center of Drug Absorption and Transport (C_DAT), Department of Clinical Pharmacology, Greifswald, Germany (S.O., D.B); and Medical Research Institute, Ninewells Hospital and Medical School, University of Dundee, Dundee, United Kingdom (Y.K., L.A.M., D.L., C.H., C.R.W)
| | - Stefan Oswald
- Taconic Biosciences GmbH, Köln, Germany (N.S., A.R.); University Medicine of Greifswald, Center of Drug Absorption and Transport (C_DAT), Department of Clinical Pharmacology, Greifswald, Germany (S.O., D.B); and Medical Research Institute, Ninewells Hospital and Medical School, University of Dundee, Dundee, United Kingdom (Y.K., L.A.M., D.L., C.H., C.R.W)
| | - Diana Busch
- Taconic Biosciences GmbH, Köln, Germany (N.S., A.R.); University Medicine of Greifswald, Center of Drug Absorption and Transport (C_DAT), Department of Clinical Pharmacology, Greifswald, Germany (S.O., D.B); and Medical Research Institute, Ninewells Hospital and Medical School, University of Dundee, Dundee, United Kingdom (Y.K., L.A.M., D.L., C.H., C.R.W)
| | - Lesley A McLaughlin
- Taconic Biosciences GmbH, Köln, Germany (N.S., A.R.); University Medicine of Greifswald, Center of Drug Absorption and Transport (C_DAT), Department of Clinical Pharmacology, Greifswald, Germany (S.O., D.B); and Medical Research Institute, Ninewells Hospital and Medical School, University of Dundee, Dundee, United Kingdom (Y.K., L.A.M., D.L., C.H., C.R.W)
| | - De Lin
- Taconic Biosciences GmbH, Köln, Germany (N.S., A.R.); University Medicine of Greifswald, Center of Drug Absorption and Transport (C_DAT), Department of Clinical Pharmacology, Greifswald, Germany (S.O., D.B); and Medical Research Institute, Ninewells Hospital and Medical School, University of Dundee, Dundee, United Kingdom (Y.K., L.A.M., D.L., C.H., C.R.W)
| | - Colin J Henderson
- Taconic Biosciences GmbH, Köln, Germany (N.S., A.R.); University Medicine of Greifswald, Center of Drug Absorption and Transport (C_DAT), Department of Clinical Pharmacology, Greifswald, Germany (S.O., D.B); and Medical Research Institute, Ninewells Hospital and Medical School, University of Dundee, Dundee, United Kingdom (Y.K., L.A.M., D.L., C.H., C.R.W)
| | - C Roland Wolf
- Taconic Biosciences GmbH, Köln, Germany (N.S., A.R.); University Medicine of Greifswald, Center of Drug Absorption and Transport (C_DAT), Department of Clinical Pharmacology, Greifswald, Germany (S.O., D.B); and Medical Research Institute, Ninewells Hospital and Medical School, University of Dundee, Dundee, United Kingdom (Y.K., L.A.M., D.L., C.H., C.R.W)
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25
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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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26
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Yasuda K, Cline C, Lin YS, Scheib R, Ganguly S, Thirumaran RK, Chaudhry A, Kim RB, Schuetz EG. In Vivo Imaging of Human MDR1 Transcription in the Brain and Spine of MDR1-Luciferase Reporter Mice. Drug Metab Dispos 2015; 43:1646-54. [PMID: 26281846 DOI: 10.1124/dmd.115.065078] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/24/2015] [Accepted: 08/12/2015] [Indexed: 01/16/2023] Open
Abstract
P-glycoprotein (Pgp) [the product of the MDR1 (ABCB1) gene] at the blood-brain barrier (BBB) limits central nervous system (CNS) entry of many prescribed drugs, contributing to the poor success rate of CNS drug candidates. Modulating Pgp expression could improve drug delivery into the brain; however, assays to predict regulation of human BBB Pgp are lacking. We developed a transgenic mouse model to monitor human MDR1 transcription in the brain and spinal cord in vivo. A reporter construct consisting of ∼10 kb of the human MDR1 promoter controlling the firefly luciferase gene was used to generate a transgenic mouse line (MDR1-luc). Fluorescence in situ hybridization localized the MDR1-luciferase transgene on chromosome 3. Reporter gene expression was monitored with an in vivo imaging system following D-luciferin injection. Basal expression was detectable in the brain, and treatment with activators of the constitutive androstane, pregnane X, and glucocorticoid receptors induced brain and spinal MDR1-luc transcription. Since D-luciferin is a substrate of ABCG2, the feasibility of improving D-luciferin brain accumulation (and luciferase signal) was tested by coadministering the dual ABCB1/ABCG2 inhibitor elacridar. The brain and spine MDR1-luc signal intensity was increased by elacridar treatment, suggesting enhanced D-luciferin brain bioavailability. There was regional heterogeneity in MDR1 transcription (cortex > cerebellum) that coincided with higher mouse Pgp protein expression. We confirmed luciferase expression in brain vessel endothelial cells by ex vivo analysis of tissue luciferase protein expression. We conclude that the MDR1-luc mouse provides a unique in vivo system to visualize MDR1 CNS expression and regulation.
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Affiliation(s)
- Kazuto Yasuda
- Department of Pharmaceutical Sciences, St. Jude Children's Research Hospital, Memphis, Tennessee (K.Y., C.C., R.S., S.G., R.K.T., A.C., E.G.S.); Department of Medicine, Division of Clinical Pharmacology, University of Western Ontario, London, Ontario, Canada (R.B.K.); and Department of Pharmaceutics, The University of Washington, Seattle, Washington (Y.S.L.)
| | - Cynthia Cline
- Department of Pharmaceutical Sciences, St. Jude Children's Research Hospital, Memphis, Tennessee (K.Y., C.C., R.S., S.G., R.K.T., A.C., E.G.S.); Department of Medicine, Division of Clinical Pharmacology, University of Western Ontario, London, Ontario, Canada (R.B.K.); and Department of Pharmaceutics, The University of Washington, Seattle, Washington (Y.S.L.)
| | - Yvonne S Lin
- Department of Pharmaceutical Sciences, St. Jude Children's Research Hospital, Memphis, Tennessee (K.Y., C.C., R.S., S.G., R.K.T., A.C., E.G.S.); Department of Medicine, Division of Clinical Pharmacology, University of Western Ontario, London, Ontario, Canada (R.B.K.); and Department of Pharmaceutics, The University of Washington, Seattle, Washington (Y.S.L.)
| | - Rachel Scheib
- Department of Pharmaceutical Sciences, St. Jude Children's Research Hospital, Memphis, Tennessee (K.Y., C.C., R.S., S.G., R.K.T., A.C., E.G.S.); Department of Medicine, Division of Clinical Pharmacology, University of Western Ontario, London, Ontario, Canada (R.B.K.); and Department of Pharmaceutics, The University of Washington, Seattle, Washington (Y.S.L.)
| | - Samit Ganguly
- Department of Pharmaceutical Sciences, St. Jude Children's Research Hospital, Memphis, Tennessee (K.Y., C.C., R.S., S.G., R.K.T., A.C., E.G.S.); Department of Medicine, Division of Clinical Pharmacology, University of Western Ontario, London, Ontario, Canada (R.B.K.); and Department of Pharmaceutics, The University of Washington, Seattle, Washington (Y.S.L.)
| | - Ranjit K Thirumaran
- Department of Pharmaceutical Sciences, St. Jude Children's Research Hospital, Memphis, Tennessee (K.Y., C.C., R.S., S.G., R.K.T., A.C., E.G.S.); Department of Medicine, Division of Clinical Pharmacology, University of Western Ontario, London, Ontario, Canada (R.B.K.); and Department of Pharmaceutics, The University of Washington, Seattle, Washington (Y.S.L.)
| | - Amarjit Chaudhry
- Department of Pharmaceutical Sciences, St. Jude Children's Research Hospital, Memphis, Tennessee (K.Y., C.C., R.S., S.G., R.K.T., A.C., E.G.S.); Department of Medicine, Division of Clinical Pharmacology, University of Western Ontario, London, Ontario, Canada (R.B.K.); and Department of Pharmaceutics, The University of Washington, Seattle, Washington (Y.S.L.)
| | - Richard B Kim
- Department of Pharmaceutical Sciences, St. Jude Children's Research Hospital, Memphis, Tennessee (K.Y., C.C., R.S., S.G., R.K.T., A.C., E.G.S.); Department of Medicine, Division of Clinical Pharmacology, University of Western Ontario, London, Ontario, Canada (R.B.K.); and Department of Pharmaceutics, The University of Washington, Seattle, Washington (Y.S.L.)
| | - Erin G Schuetz
- Department of Pharmaceutical Sciences, St. Jude Children's Research Hospital, Memphis, Tennessee (K.Y., C.C., R.S., S.G., R.K.T., A.C., E.G.S.); Department of Medicine, Division of Clinical Pharmacology, University of Western Ontario, London, Ontario, Canada (R.B.K.); and Department of Pharmaceutics, The University of Washington, Seattle, Washington (Y.S.L.)
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Abstract
Drug metabolism can produce metabolites with physicochemical and pharmacological properties that differ substantially from those of the parent drug, and consequently has important implications for both drug safety and efficacy. To reduce the risk of costly clinical-stage attrition due to the metabolic characteristics of drug candidates, there is a need for efficient and reliable ways to predict drug metabolism in vitro, in silico and in vivo. In this Perspective, we provide an overview of the state of the art of experimental and computational approaches for investigating drug metabolism. We highlight the scope and limitations of these methods, and indicate strategies to harvest the synergies that result from combining measurement and prediction of drug metabolism.
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Gonzalez FJ, Fang ZZ, Ma X. Transgenic mice and metabolomics for study of hepatic xenobiotic metabolism and toxicity. Expert Opin Drug Metab Toxicol 2015; 11:869-81. [PMID: 25836352 DOI: 10.1517/17425255.2015.1032245] [Citation(s) in RCA: 36] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
Abstract
INTRODUCTION The study of xenobiotic metabolism and toxicity has been greatly aided by the use of genetically modified mouse models and metabolomics. AREAS COVERED Gene knockout mice can be used to determine the enzymes responsible for the metabolism of xenobiotics in vivo and to examine the mechanisms of xenobiotic-induced toxicity. Humanized mouse models are especially important because there exist marked species differences in the xenobiotic-metabolizing enzymes and the nuclear receptors that regulate these enzymes. Humanized mice expressing CYPs and nuclear receptors including the pregnane X receptor, the major regulator of xenobiotic metabolism and transport were produced. With genetically modified mouse models, metabolomics can determine the metabolic map of many xenobiotics with a level of sensitivity that allows the discovery of even minor metabolites. This technology can be used for determining the mechanism of xenobiotic toxicity and to find early biomarkers for toxicity. EXPERT OPINION Metabolomics and genetically modified mouse models can be used for the study of xenobiotic metabolism and toxicity by: i) comparison of the metabolomics profiles between wild-type and genetically modified mice, and searching for genotype-dependent endogenous metabolites; ii) searching for and elucidating metabolites derived from xenobiotics; and iii) discovery of specific alterations of endogenous compounds induced by xenobiotics-induced toxicity.
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Affiliation(s)
- Frank J Gonzalez
- National Institutes of Health, National Cancer Institute, Center for Cancer Research, Laboratory of Metabolism , Bethesda, MD 20892 , USA +1 301 496 9067 ; +1 301 496 8419 ;
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29
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Shao YY, Huang J, Ma YR, Han M, Ma K, Qin HY, Rao Z, Wu XA. Serum serotonin reduced the expression of hepatic transporter Mrp2 and P-gp via regulating nuclear receptor CAR in PI-IBS rats. Can J Physiol Pharmacol 2015; 93:633-9. [PMID: 26053941 DOI: 10.1139/cjpp-2015-0039] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/02/2023]
Abstract
Hepatic transporters and drug metabolizing enzymes (DMEs) play important roles in the pharmacological effects and (or) side-effects of many drugs, and are regulated by several mediators, including neurotransmitters. This work aimed to investigate whether serum levels of 5-hydroxytryptamine (5-HT) affected the expression of hepatic transporters or DMEs. The expression of hepatic transporters was assessed using the Western-blot technique in a 2,4,6-trinitrobenzenesulfonic-acid-induced rat model of post-infectious irritable bowel syndrome (PI-IBS), in which serum levels of 5-HT were significantly elevated. To further clarify the underlying mechanism, the 5-HT precursor 5-hydroxytryptophan (5-HTP) and the 5-HT depleting agent parachlorophenylalanine (pCPA) were applied to adjust serum levels of 5-HT. Serum levels of 5-HT were measured using LC-MS/MS; the expression of hepatic transporters, DMEs, and nuclear receptors were examined by Western-blot technique. Our results showed that in PI-IBS rats the expression of multidrug resistance protein 2 (Mrp2) was significantly decreased, while colonic enterochromaffin cell density and serum levels of 5-HT were all significantly increased. Moreover, 5-HTP treatment significantly increased serum levels of 5-HT and decreased the expression of Mrp2 and glycoprotein P (P-gp), whereas treatment with pCPA markedly decreased serum levels of 5-HT and increased the expression of Mrp2 and P-gp. Our results indicated that serum 5-HT regulates the expression of Mrp2 and P-gp, and the underlying mechanism may be related to the altered expression of the nuclear receptor constitutive androstane receptor (CAR).
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Affiliation(s)
- Yun-Yun Shao
- a Department of Pharmacy, First Hospital of Lanzhou University, Lanzhou 730000, China.,b School of Pharmaceutical, Lanzhou University, Lanzhou 730000, China
| | - Jing Huang
- a Department of Pharmacy, First Hospital of Lanzhou University, Lanzhou 730000, China.,b School of Pharmaceutical, Lanzhou University, Lanzhou 730000, China
| | - Yan-Rong Ma
- a Department of Pharmacy, First Hospital of Lanzhou University, Lanzhou 730000, China.,b School of Pharmaceutical, Lanzhou University, Lanzhou 730000, China
| | - Miao Han
- a Department of Pharmacy, First Hospital of Lanzhou University, Lanzhou 730000, China.,b School of Pharmaceutical, Lanzhou University, Lanzhou 730000, China
| | - Kang Ma
- a Department of Pharmacy, First Hospital of Lanzhou University, Lanzhou 730000, China.,b School of Pharmaceutical, Lanzhou University, Lanzhou 730000, China
| | - Hong-Yan Qin
- a Department of Pharmacy, First Hospital of Lanzhou University, Lanzhou 730000, China
| | - Zhi Rao
- a Department of Pharmacy, First Hospital of Lanzhou University, Lanzhou 730000, China
| | - Xin-An Wu
- a Department of Pharmacy, First Hospital of Lanzhou University, Lanzhou 730000, China
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Zhang M, Peng CS, Li XB. In vivo and in vitro metabolites from the main diester and monoester diterpenoid alkaloids in a traditional chinese herb, the aconitum species. EVIDENCE-BASED COMPLEMENTARY AND ALTERNATIVE MEDICINE : ECAM 2015; 2015:252434. [PMID: 25705235 PMCID: PMC4332761 DOI: 10.1155/2015/252434] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 09/09/2014] [Accepted: 11/13/2014] [Indexed: 01/08/2023]
Abstract
Diester diterpenoid alkaloids (DDAs), such as aconitine (AC), mesaconitine (MA), and hypaconitine (HA), are both pharmacologically active compounds and toxic ingredients in a traditional Chinese herb, the Aconitum species. Many DDA metabolism studies have been performed to explore mechanisms for reducing toxicity in these compounds and in Aconitum species extracts for safe clinical administration. In this review, we summarize recent progress on the metabolism of toxic AC, MA, and HA and corresponding monoester diterpenoid alkaloids (MDAs) in the gastrointestinal tract and liver in different animal species and humans in vivo and/or in vitro, where these alkaloids are primarily metabolized by cytochrome P450 enzymes, carboxylesterases, and intestinal bacteria, which produces phase I metabolites, ester hydrolysed products, and lipoalkaloids. Furthermore, we classify metabolites detected in the blood and urine, where the aforementioned metabolites are absorbed and excreted. Less toxic MDAs and nontoxic alcohol amines are the primary DDA metabolites detected in the blood. Most other DDAs metabolites produced in the intestine and liver detected in the urine have not been reported in the blood. We propose an explanation for this nonconformity. Finally, taking AC, for instance, we generalize a process of toxicity reduction in the body after oral AC administration for the first time.
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Affiliation(s)
- Min Zhang
- School of Pharmacy, Shanghai Jiao Tong University, 800 Dongchuan Road, Shanghai 200240, China
| | - Chong-sheng Peng
- School of Pharmacy, Shanghai Jiao Tong University, 800 Dongchuan Road, Shanghai 200240, China
| | - Xiao-bo Li
- School of Pharmacy, Shanghai Jiao Tong University, 800 Dongchuan Road, Shanghai 200240, China
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Jaiswal S, Sharma A, Shukla M, Vaghasiya K, Rangaraj N, Lal J. Novel pre-clinical methodologies for pharmacokinetic drug-drug interaction studies: spotlight on "humanized" animal models. Drug Metab Rev 2014; 46:475-93. [PMID: 25270219 DOI: 10.3109/03602532.2014.967866] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/14/2023]
Abstract
Poly-therapy is common due to co-occurrence of several ailments in patients, leading to the elevated possibility of drug-drug interactions (DDI). Pharmacokinetic DDI often accounts for severe adverse drug reactions in patients resulting in withdrawal of drug from the market. Hence, the prediction of DDI is necessary at pre-clinical stage of drug development. Several human tissue and cell line-based in vitro systems are routinely used for screening metabolic and transporter pathways of investigational drugs and for predicting their clinical DDI potentials. However, ample constraints are associated with the in vitro systems and sometimes in vitro-in vivo extrapolation (IVIVE) fail to assess the risk of DDI in clinic. In vitro-in vivo correlation model in animals combined with human in vitro studies may be helpful in better prediction of clinical outcome. Native animal models vary remarkably from humans in drug metabolizing enzymes and transporters, hence, the interpretation of results from animal DDI studies is difficult. With the advent of modern molecular biology and engineering tools, novel pre-clinical animal models, namely, knockout rat/mouse, transgenic rat/mouse with humanized drug metabolizing enzymes and/or transporters and chimeric rat/mouse with humanized liver are developed. These models nearly simulate human-like drug metabolism and help to validate the in vivo relevance of the in vitro human DDI data. This review briefly discusses the application of such novel pre-clinical models for screening various type of DDI along with their advantages and limitations.
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Affiliation(s)
- Swati Jaiswal
- Pharmacokinetics & Metabolism Division, CSIR-Central Drug Research Institute , Lucknow , India
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