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Dey S, Biradar R, Mane SS, Kunnath Shaji A, Das AP, Agarwal SM, Dengale SJ. Identification and characterization of the in-vivo metabolites of the novel soluble epoxide hydrolase inhibitor EC5026 using liquid chromatography quadrupole time of flight mass spectrometry. J Pharm Biomed Anal 2024; 244:116116. [PMID: 38537542 DOI: 10.1016/j.jpba.2024.116116] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/30/2023] [Revised: 02/28/2024] [Accepted: 03/15/2024] [Indexed: 04/29/2024]
Abstract
EC5026 is a novel soluble epoxide hydrolase inhibitor being developed clinically to treat neuropathic pain and inflammation. In the current study, we employed the LC-ESI-Q-TOF-MS/MS technique to identify four in-vivo phase-I metabolites of EC5026 in rat model, out of which three were found to be novel. The identified metabolites include aliphatic hydroxylation, di-hydroxylation, terminal desaturation, and carboxylation. No phase-II metabolites were found. The pharmacokinetic profile of identified metabolites was established after a single oral dose of EC5026 to Wistar rats. The Tmax of the drug and metabolites were found to be in the range of 1-2 hours and 4-12 hours, respectively. The major metabolites M1 and M2 were found to have more than 2-fold (263.87% AUC) and equivalent exposure (96.33% AUC) compared to the parent drug, respectively. Further, the docking study revealed that the mono-hydroxylated and terminally desaturated metabolites possess better binding affinity than the parent drug. Therefore, these metabolites may hold sEH inhibition potential and can be followed through future research.
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Affiliation(s)
- Shankha Dey
- Department of Pharmaceutical Analysis, National Institute of Pharmaceutical Education and Research (NIPER), Guwahati, Changsari 781101, India
| | - Rushikesh Biradar
- Department of Pharmaceutical Analysis, National Institute of Pharmaceutical Education and Research (NIPER), Guwahati, Changsari 781101, India
| | - Sayalee Sanjay Mane
- Department of Pharmaceutical Analysis, National Institute of Pharmaceutical Education and Research (NIPER), Guwahati, Changsari 781101, India
| | - Anandhu Kunnath Shaji
- Department of Pharmaceutical Analysis, National Institute of Pharmaceutical Education and Research (NIPER), Guwahati, Changsari 781101, India
| | - Agneesh Pratim Das
- ICMR-National Institute of Cancer Prevention and Research, I-7, Sector-39, Noida 201301, India
| | - Subhash Mohan Agarwal
- ICMR-National Institute of Cancer Prevention and Research, I-7, Sector-39, Noida 201301, India
| | - Swapnil Jayant Dengale
- Department of Pharmaceutical Analysis, National Institute of Pharmaceutical Education and Research (NIPER), Guwahati, Changsari 781101, India.
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2
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Hu A, Liu Q, Ouyang J. Identification and characterization of the metabolites of moscatilin in mouse, rat, dog, monkey and human hepatocytes by LC-Orbitrap-MS/MS combined with diagnostic fragment ions and accurate mass measurements. Biomed Chromatogr 2023; 37:e5573. [PMID: 36529812 DOI: 10.1002/bmc.5573] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/24/2022] [Revised: 12/07/2022] [Accepted: 12/13/2022] [Indexed: 12/23/2022]
Abstract
Moscatilin, a bibenzyl derivative from the stem of Dendrobium loddigesii, has been shown to have anticancer activity. The aim of this study was to identify and characterize the possible in vitro metabolites of moscatilin generated from hepatocytes. The metabolites generated in the hepatocytes of mouse, rat, dog, monkey and human were identified and characterized employing ultra-high-performance liquid chromatography coupled with quadrupole Orbitrap tandem mass spectrometry (LC-Orbitrap-MS/MS) based on diagnostic fragment ions and accurate mass measurements. A total of 18 metabolites were identified, among which seven were phase I and 11 were phase II metabolites. The plausible structures of the metabolites and the probable biotransformation pathways were proposed based on the diagnostic fragment ions, chemical formula and mass fragmentation pattern, as well as the accurate masses. The majority of phase I metabolites were generated by demethylation and hydroxylation, while phase II metabolites were mainly generated by glucuronidation, glutathione conjugation and sulfation. Our study first expounded the metabolites of moscatilin in mouse, rat, dog, monkey and human hepatocytes and provided a foundation for a further pharmacokinetic and toxicity study. More importantly, LC-Orbitrap-MS/MS combined with diagnostic fragment ions and accurate mass measurements has been proved to be an effective method for the rapid identification of bibenzyl derivatives and their metabolites.
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Affiliation(s)
- Aizhen Hu
- Clinical Research Center, Chongqing Public Health Medical Center, Chongqing, China
| | - Qingwang Liu
- Institute of Heath and Medical Technology, Hefei Institute of Physical Science, Chinese Academy of Sciences, Hefei, Anhui Province, China
| | - Jing Ouyang
- Clinical Research Center, Chongqing Public Health Medical Center, Chongqing, China
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3
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Liu L, Liu Y, Zhou X, Xu Z, Zhang Y, Ji L, Hong C, Li C. Analyzing the metabolic fate of oral administration drugs: A review and state-of-the-art roadmap. Front Pharmacol 2022; 13:962718. [PMID: 36278150 PMCID: PMC9585159 DOI: 10.3389/fphar.2022.962718] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/06/2022] [Accepted: 09/20/2022] [Indexed: 11/16/2022] Open
Abstract
The key orally delivered drug metabolism processes are reviewed to aid the assessment of the current in vivo/vitro experimental systems applicability for evaluating drug metabolism and the interaction potential. Orally administration is the most commonly used state-of-the-art road for drug delivery due to its ease of administration, high patient compliance and cost-effectiveness. Roles of gut metabolic enzymes and microbiota in drug metabolism and absorption suggest that the gut is an important site for drug metabolism, while the liver has long been recognized as the principal organ responsible for drugs or other substances metabolism. In this contribution, we explore various experimental models from their development to the application for studying oral drugs metabolism of and summarized advantages and disadvantages. Undoubtedly, understanding the possible metabolic mechanism of drugs in vivo and evaluating the procedure with relevant models is of great significance for screening potential clinical drugs. With the increasing popularity and prevalence of orally delivered drugs, sophisticated experimental models with higher predictive capacity for the metabolism of oral drugs used in current preclinical studies will be needed. Collectively, the review seeks to provide a comprehensive roadmap for researchers in related fields.
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Huang X, Jia M, Liu Y, Wang S, Tang Y, Li X, Jiang X, Wu Z, Lou Y, Fan G. Identification of bicyclol metabolites in rat plasma, urine and feces by UPLC-Q-TOF-MS/MS and evaluation of the efficacy and safety of these metabolites based on network pharmacology and molecular docking combined with toxicity prediction. J Pharm Biomed Anal 2022; 220:114947. [DOI: 10.1016/j.jpba.2022.114947] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/10/2022] [Revised: 07/13/2022] [Accepted: 07/14/2022] [Indexed: 10/17/2022]
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5
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Zhang H, Hu Z, Zhang H, Sun X, Yang J, Yuan J. Characterization of the metabolites of tirabrutinib generated from rat, dog and human liver microsomes using ultra-high-performance liquid chromatography combined with high-resolution mass spectrometry. RAPID COMMUNICATIONS IN MASS SPECTROMETRY : RCM 2022; 36:e9240. [PMID: 34904306 DOI: 10.1002/rcm.9240] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/02/2021] [Revised: 12/07/2021] [Accepted: 12/08/2021] [Indexed: 06/14/2023]
Abstract
RATIONALE Tirabrutinib is an orally administered Bruton's tyrosine kinase (BTK) inhibitor developed for the treatment of autoimmune disorders and haematological malignancies. The goals of this study were to identify the metabolites of tirabrutinib and to propose the metabolic pathways. METHODS Tirabrutinib was individually incubated with rat, dog and human liver microsomes at 37°C for 1 h. To trap the potential reactive metabolites, glutathione (GSH) was incorporated into the incubation samples. The incubation samples were analysed using ultra-high-performance liquid chromatography combined with high-resolution mass spectrometry (UHPLC-HRMS). The metabolites were identified and characterized by exact masses, product ions and retention times. RESULTS A total of 18 metabolites, including four GSH conjugates, were identified and characterized in terms of elemental compositions and product ions. The metabolic pathways of tirabrutinib included amide hydrolysis, O-dealkylation, mono-oxygenation, di-oxygenation and GSH conjugation. Among these metabolites, M10 was the most abundant metabolite. Compared with dog, rat has the closer metabolic profiles to humans, and thus it would be more suitable for toxicity study. CONCLUSIONS This study provides valuable data regarding the in vitro metabolism of tirabrutinib, which may be helpful for further safety assessment of this drug.
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Affiliation(s)
- Hongjian Zhang
- Department of Otorhinolaryngology-Head and Neck Surgery, Hefei Cancer Hospital, Chinese Academy of Science, Hefei, China
- Anhui Province Key Laboratory of Medical Physics and Technology, Institute of Health & Medical Technology, Hefei Institutes of Physical Science, Chinese Academy of Sciences, Hefei, China
| | - Zhen Hu
- Department of Radiology, The Second Hospital of Anhui Medical University, Hefei, China
| | - Huiping Zhang
- Department of Otorhinolaryngology-Head and Neck Surgery, Hefei Cancer Hospital, Chinese Academy of Science, Hefei, China
- Anhui Province Key Laboratory of Medical Physics and Technology, Institute of Health & Medical Technology, Hefei Institutes of Physical Science, Chinese Academy of Sciences, Hefei, China
| | - Xiyan Sun
- Department of Otorhinolaryngology-Head and Neck Surgery, Hefei Cancer Hospital, Chinese Academy of Science, Hefei, China
- Anhui Province Key Laboratory of Medical Physics and Technology, Institute of Health & Medical Technology, Hefei Institutes of Physical Science, Chinese Academy of Sciences, Hefei, China
| | - Jianming Yang
- Department of Otorhinolaryngology-Head and Neck Surgery, The Second Hospital of Anhui Medical University, Hefei, China
| | - Jie Yuan
- Anhui Provincial Institute for Food and Drug Control, Hefei, China
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Jana R, Begam HM, Dinda E. The emergence of the C-H functionalization strategy in medicinal chemistry and drug discovery. Chem Commun (Camb) 2021; 57:10842-10866. [PMID: 34596175 DOI: 10.1039/d1cc04083a] [Citation(s) in RCA: 37] [Impact Index Per Article: 12.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022]
Abstract
Owing to the market competitiveness and urgent societal need, an optimum speed of drug discovery is an important criterion for successful implementation. Despite the rapid ascent of artificial intelligence and computational and bioanalytical techniques to accelerate drug discovery in big pharma, organic synthesis of privileged scaffolds predicted in silico for in vitro and in vivo studies is still considered as the rate-limiting step. C-H activation is the latest technology added into an organic chemist's toolbox for the rapid construction and late-stage modification of functional molecules to achieve the desired chemical and physical properties. Particularly, elimination of prefunctionalization steps, exceptional functional group tolerance, complexity-to-diversity oriented synthesis, and late-stage functionalization of privileged medicinal scaffolds expand the chemical space. It has immense potential for the rapid synthesis of a library of molecules, structural modification to achieve the required pharmacological properties such as absorption, distribution, metabolism, excretion, toxicology (ADMET) and attachment of chemical reporters for proteome profiling, metabolite synthesis, etc. for preclinical studies. Although heterocycle synthesis, late-stage drug modification, 18F labelling, methylation, etc. via C-H functionalization have been reviewed from the synthetic standpoint, a general overview of these protocols from medicinal and drug discovery aspects has not been reviewed. In this feature article, we will discuss the recent trends of C-H activation methodologies such as synthesis of medicinal scaffolds through C-H activation/annulation cascade; C-H arylation for sp2-sp2 and sp2-sp3 cross-coupling; C-H borylation/silylation to introduce a functional linchpin for further manipulation; C-H amination for N-heterocycles and hydrogen bond acceptors; C-H fluorination/fluoroalkylation to tune polarity and lipophilicity; C-H methylation: methyl magic in drug discovery; peptide modification and macrocyclization for therapeutics and biologics; fluorescent labelling and radiolabelling for bioimaging; bioconjugation for chemical biology studies; drug-metabolite synthesis for biodistribution and excretion studies; late-stage diversification of drug-molecules to increase efficacy and safety; cutting-edge DNA encoded library synthesis and improved synthesis of drug molecules via C-H activation in medicinal chemistry and drug discovery.
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Affiliation(s)
- Ranjan Jana
- Organic and Medicinal Chemistry Division, CSIR-Indian Institute of Chemical Biology, 4 Raja S. C. Mullick Road, Kolkata-700032, India.
| | - Hasina Mamataj Begam
- Organic and Medicinal Chemistry Division, CSIR-Indian Institute of Chemical Biology, 4 Raja S. C. Mullick Road, Kolkata-700032, India.
| | - Enakshi Dinda
- Department of Chemistry and Environment, Heritage Institute of Technology, Kolkata-700107, India
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Rao Gajula SN, Pillai MS, Samanthula G, Sonti R. Cytochrome P450 enzymes: a review on drug metabolizing enzyme inhibition studies in drug discovery and development. Bioanalysis 2021; 13:1355-1378. [PMID: 34517735 DOI: 10.4155/bio-2021-0132] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023] Open
Abstract
Assessment of drug candidate's potential to inhibit cytochrome P450 (CYP) enzymes remains crucial in pharmaceutical drug discovery and development. Both direct and time-dependent inhibition of drug metabolizing CYP enzymes by the concomitant administered drug is the leading cause of drug-drug interactions (DDIs), resulting in the increased toxicity of the victim drug. In this context, pharmaceutical companies have grown increasingly diligent in limiting CYP inhibition liabilities of drug candidates in the early stages and examining risk assessments throughout the drug development process. This review discusses different strategies and decision-making processes for assessing the drug-drug interaction risks by enzyme inhibition and lays particular emphasis on in vitro study designs and interpretation of CYP inhibition data in a stage-appropriate context.
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Affiliation(s)
- Siva Nageswara Rao Gajula
- Department of Pharmaceutical Analysis, National Institute of Pharmaceutical Education & Research (NIPER), Hyderabad, Balanagar, Telangana, 50003, India
| | - Megha Sajakumar Pillai
- Department of Pharmaceutical Analysis, National Institute of Pharmaceutical Education & Research (NIPER), Hyderabad, Balanagar, Telangana, 50003, India
| | - Gananadhamu Samanthula
- Department of Pharmaceutical Analysis, National Institute of Pharmaceutical Education & Research (NIPER), Hyderabad, Balanagar, Telangana, 50003, India
| | - Rajesh Sonti
- Department of Pharmaceutical Analysis, National Institute of Pharmaceutical Education & Research (NIPER), Hyderabad, Balanagar, Telangana, 50003, India
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Zhang Z, Qiu C, Xu Y, Han Q, Tang J, Loh KP, Su C. Semiconductor photocatalysis to engineering deuterated N-alkyl pharmaceuticals enabled by synergistic activation of water and alkanols. Nat Commun 2020; 11:4722. [PMID: 32948764 PMCID: PMC7501254 DOI: 10.1038/s41467-020-18458-w] [Citation(s) in RCA: 28] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/03/2020] [Accepted: 08/11/2020] [Indexed: 12/23/2022] Open
Abstract
Precisely controlled deuterium labeling at specific sites of N-alkyl drugs is crucial in drug-development as over 50% of the top-selling drugs contain N-alkyl groups, in which it is very challenging to selectively replace protons with deuterium atoms. With the goal of achieving controllable isotope-labeling in N-alkylated amines, we herein rationally design photocatalytic water-splitting to furnish [H] or [D] and isotope alkanol-oxidation by photoexcited electron-hole pairs on a polymeric semiconductor. The controlled installation of N-CH3, -CDH2, -CD2H, -CD3, and -13CH3 groups into pharmaceutical amines thus has been demonstrated by tuning isotopic water and methanol. More than 50 examples with a wide range of functionalities are presented, demonstrating the universal applicability and mildness of this strategy. Gram-scale production has been realized, paving the way for the practical photosynthesis of pharmaceuticals.
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Affiliation(s)
- Zhaofei Zhang
- International Collaborative Laboratory of 2D Materials for Optoelectronic Science & Technology of Ministry of Education, Engineering Technology Research Center for 2D Materials Information Functional Devices and Systems of Guangdong Province, Institute of Microscale Optoeletronics, Shenzhen University, 518060, Shenzhen, China
| | - Chuntian Qiu
- International Collaborative Laboratory of 2D Materials for Optoelectronic Science & Technology of Ministry of Education, Engineering Technology Research Center for 2D Materials Information Functional Devices and Systems of Guangdong Province, Institute of Microscale Optoeletronics, Shenzhen University, 518060, Shenzhen, China
| | - Yangsen Xu
- International Collaborative Laboratory of 2D Materials for Optoelectronic Science & Technology of Ministry of Education, Engineering Technology Research Center for 2D Materials Information Functional Devices and Systems of Guangdong Province, Institute of Microscale Optoeletronics, Shenzhen University, 518060, Shenzhen, China
| | - Qing Han
- Department of Chemical Engineering, University College London, Torrington Place, London, WC1E 7JE, UK
- Key Laboratory of Photoelectronic/Electrophotonic, Conversion Materials, Key Laboratory of Cluster Science, Ministry of Education, School of Chemistry, Beijing Institute of Technology, 100081, Beijing, China
| | - Junwang Tang
- Department of Chemical Engineering, University College London, Torrington Place, London, WC1E 7JE, UK
| | - Kian Ping Loh
- Department of Chemistry and Centre for Advanced 2D Materials (CA2DM), National University of Singapore, 3 Science Drive 3, Singapore, 117543, Singapore
| | - Chenliang Su
- International Collaborative Laboratory of 2D Materials for Optoelectronic Science & Technology of Ministry of Education, Engineering Technology Research Center for 2D Materials Information Functional Devices and Systems of Guangdong Province, Institute of Microscale Optoeletronics, Shenzhen University, 518060, Shenzhen, China.
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9
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Li R, Ren M, Lu W, Yuan Y, Li J, Zhong W. A validated LC-MS/MS method for the determination of RAF inhibitor LXH254: Application to pharmacokinetic study in rat. Biomed Chromatogr 2020; 35:e4968. [PMID: 32881002 DOI: 10.1002/bmc.4968] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/15/2020] [Revised: 08/04/2020] [Accepted: 08/06/2020] [Indexed: 11/06/2022]
Abstract
In this study, a simple and sensitive UHPLC-ESI-MS/MS method was established for the determination of LXH254 in rat plasma. The developed method was validated according to the Food and Drug administration guidelines. After extraction using ethyl acetate, the sample was separated on an ACQUITY BEH C18 column. The mobile phase consisted of 2 mM ammonium acetate containing 0.1% formic acid and acetonitrile as the mobile phase with gradient elution. The flow rate was 0.3 mL/min. A TSQ triple quadrupole mass spectrometer operated in positive-ion mode was used for mass detection, with multiple reaction monitoring transitions of m/z 503.3 > 459.1 and m/z 435.3 > 367.1 for LXH254 and olaparib (internal standard), respectively. An excellent linearity was achieved in the concentration range of 0.1-1000 ng/mL, with correlation coefficient >0.998. The mean recovery was more than 78.55%. Inter- and intra-day precision (percentage of relative standard deviation) did not exceed 12.87%, and accuracy was in the range of -2.50 to 13.50%. LXH254 was demonstrated to be stable under the tested storage conditions. The validated UHPLC-MS/MS method was further applied to the pharmacokinetic study of LXH254 in rat plasma after oral (2, 5, and 15 mg/kg) and intravenous (2 mg/kg) administrations. The pharmacokinetic study revealed that LXH254 showed low clearance, moderate bioavailability (~30%), and linear pharmacokinetic profile over the oral dose range of 2-15 mg/kg. To the best of our knowledge, this is the first report on the method development and validation of the determination of LXH254 and its application to pharmacokinetic study.
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Affiliation(s)
- Rong Li
- Department of Pharmacy, Luzhou People's Hospital, Luzhou, China
| | - Meiping Ren
- School of Pharmacy, Southwest Medical University, Luzhou, China
| | - Wei Lu
- Department of Internal Medicine, Luzhou People's Hospital, Luzhou, China
| | - Yunhua Yuan
- Department of Neurology, Luzhou People's Hospital, Luzhou, China
| | - Jian Li
- Department of Urology, Luzhou People's Hospital, Luzhou, China
| | - Wu Zhong
- Department of Vascular Surgery, Luzhou People's Hospital, Luzhou, China
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Temerdashev AZ, Dmitrieva EV. Methods for the Determination of Selective Androgen Receptor Modulators. JOURNAL OF ANALYTICAL CHEMISTRY 2020. [DOI: 10.1134/s1061934820070187] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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Shi Q, Liu Y, Liu C, Wang J. Characterization of the metabolites of TUG-891 in rat, dog, and human hepatocytes using ultra-high-performance liquid chromatography tandem mass spectrometry and nuclear magnetic resonance spectroscopy. RAPID COMMUNICATIONS IN MASS SPECTROMETRY : RCM 2020; 34:e8766. [PMID: 32108961 DOI: 10.1002/rcm.8766] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/31/2020] [Revised: 02/24/2020] [Accepted: 02/25/2020] [Indexed: 06/10/2023]
Abstract
RATIONALE TUG-891 is a potent and selective agonist of the long chain free fatty acid receptor 4. However, its metabolic profiles have not been revealed. The aim of this study was to investigate the in vitro metabolism of TUG-891 in hepatocytes. METHODS TUG-891 at a concentration of 20 μM was incubated with rat, dog, and human hepatocytes at 37°C for 120 min. The samples were analyzed using ultra-high-performance liquid chromatography combined with electrospray ionization tandem mass spectrometry. The structures of the metabolites were proposed according to their MS/MS product ions. Furthermore, M4 and M5 were biosynthesized using human liver microsomes, and their structures were characterized using 13 C-NMR spectroscopy. RESULTS Under the current conditions, eight metabolites were detected and structurally identified using high-resolution LC/MS and MS/MS spectra. The metabolites M4 and M5 were unambiguously confirmed to be TUG-891 alcohol and TUG-891 acid, respectively, using 13 C-NMR spectroscopy. Our results revealed that hydroxylation of methyl group at C-21 position to form TUG-891 alcohol (M5) followed by oxidation to yield TUG-891 aldehyde (M7) and carboxylic acid (M4) were the major metabolism processes. Phase II metabolism processes included glucuronidation and sulphation. CONCLUSIONS Hydroxylation at the C-21 position was the primary metabolic site of TUG-891. This study provided an overview of the metabolic profiles of TUG-891 in hepatocytes.
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Affiliation(s)
- Qinghong Shi
- Department of Clinical Laboratory, China-Japan Union Hospital of Jilin University, Changchun, Jilin, China
| | - Yang Liu
- Department of Radiological, Second Hospital of Jilin University, Changchun, Jilin, China
| | - Chunyan Liu
- Department of Radiological, Second Hospital of Jilin University, Changchun, Jilin, China
| | - Jingying Wang
- Department of Clinical Laboratory, China-Japan Union Hospital of Jilin University, Changchun, Jilin, China
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12
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Li F, MacKenzie KR, Jain P, Santini C, Young DW, Matzuk MM. Metabolism of JQ1, an inhibitor of bromodomain and extra terminal bromodomain proteins, in human and mouse liver microsomes†. Biol Reprod 2020; 103:427-436. [PMID: 32285106 PMCID: PMC7401416 DOI: 10.1093/biolre/ioaa043] [Citation(s) in RCA: 21] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/14/2020] [Revised: 03/30/2020] [Accepted: 04/09/2020] [Indexed: 12/14/2022] Open
Abstract
JQ1 is a small-molecule inhibitor of the bromodomain and extra terminal (BET) protein family that potently inhibits the bromodomain testis-specific protein (BRDT), which is essential for spermatogenesis. JQ1 treatment produces a reversible contraceptive effect by targeting the activity of BRDT in mouse male germ cells, validating BRDT as a male contraceptive target. Although JQ1 possesses favourable physical properties, it exhibits a short half-life. Because the details of xenobiotic metabolism play important roles in the optimization of drug candidates and in determining the role of metabolism in drug efficacy, we investigated the metabolism of JQ1 in human and mouse liver microsomes. We present the first comprehensive view of JQ1 metabolism in liver microsomes, distinguishing nine JQ1 metabolites, including three monohydroxylated, one de-tert-butylated, two dihydroxylated, one monohydroxylated/dehydrogenated, one monohydroxylated-de-tert-butylated and one dihydroxylated/dehydrogenated variant of JQ1. The dominant metabolite (M1) in both human and mouse liver microsomes is monohydroxylated on the fused three-ring core. Using recombinant cytochrome P450 (CYP) enzymes, chemical inhibitors and the liver S9 fraction of Cyp3a-null mice, we identify enzymes that contribute to the formation of these metabolites. Cytochrome P450 family 3 subfamily A member 4 (CYP3A4) is the main contributor to the production of JQ1 metabolites in vitro, and the CYP3A4/5 inhibitor ketoconazole strongly inhibits JQ1 metabolism in both human and mouse liver microsomes. Our findings suggest that JQ1 half-life and efficacy might be improved in vivo by co-administration of a selective CYP inhibitor, thereby impacting the use of JQ1 as a probe for BRDT activity in spermatogenesis and as a probe or therapeutic in other systems.
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Affiliation(s)
- Feng Li
- Center for Drug Discovery, Baylor College of Medicine, Houston, TX, USA.,Department of Pathology and Immunology, Baylor College of Medicine, Houston, TX, USA.,Department of Pharmacology and Chemical Biology, Baylor College of Medicine, Houston, TX, USA.,NMR and Drug Metabolism Core, Advanced Technology Cores, Baylor College of Medicine Houston, TX, USA
| | - Kevin R MacKenzie
- Center for Drug Discovery, Baylor College of Medicine, Houston, TX, USA.,Department of Pathology and Immunology, Baylor College of Medicine, Houston, TX, USA.,Department of Pharmacology and Chemical Biology, Baylor College of Medicine, Houston, TX, USA.,NMR and Drug Metabolism Core, Advanced Technology Cores, Baylor College of Medicine Houston, TX, USA
| | - Prashi Jain
- Center for Drug Discovery, Baylor College of Medicine, Houston, TX, USA.,Department of Pathology and Immunology, Baylor College of Medicine, Houston, TX, USA
| | - Conrad Santini
- Center for Drug Discovery, Baylor College of Medicine, Houston, TX, USA.,Department of Pathology and Immunology, Baylor College of Medicine, Houston, TX, USA
| | - Damian W Young
- Center for Drug Discovery, Baylor College of Medicine, Houston, TX, USA.,Department of Pathology and Immunology, Baylor College of Medicine, Houston, TX, USA.,Department of Pharmacology and Chemical Biology, Baylor College of Medicine, Houston, TX, USA
| | - Martin M Matzuk
- Center for Drug Discovery, Baylor College of Medicine, Houston, TX, USA.,Department of Pathology and Immunology, Baylor College of Medicine, Houston, TX, USA.,Department of Pharmacology and Chemical Biology, Baylor College of Medicine, Houston, TX, USA
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13
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Zhang D, Hao X, Xu L, Yang Y, Zhao H. Characterization of the metabolites of H3B-6545 in vitro and in vivo by using ultra-high performance liquid chromatography combined with electrospray ionization linear ion trap-orbitrap tandem mass spectrometry. Biomed Chromatogr 2020; 34:e4746. [PMID: 31725913 DOI: 10.1002/bmc.4746] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/30/2019] [Revised: 11/07/2019] [Accepted: 11/08/2019] [Indexed: 11/08/2022]
Abstract
H3B-6545 is a selective ERα covalent antagonist, which has been demonstrated to be effective in anti-tumor. To fully understand its mechanism of action, it is necessary to investigate the in vitro and in vivo metabolic profiles. For in vitro metabolism, H3B-6545 (50 μM) was incubated with the hepatocytes of rat and human for 2 h. For in vivo metabolism H3B-6545 was orally administered to rats at a single dose of 10 mg/kg, and plasma, urine and fecal samples were then collected. All samples were analyzed by using ultra-high performance liquid chromatography combined with linear ion trap-orbitrap tandem mass spectrometry (UHPLC-LTQ-Orbitrap-MS) operated in positive ion mode. The structures of the metabolites were elucidated by comparing their MS and MS2 spectra with those of parent drug. A total of 11 metabolites, including a GSH adduct, were detected and structurally identified. M2, M7 and M8 were further unambiguously identified by using reference standards. Among these metabolites, M1, M5, M7 and M10 were newly found and reported for the first time. The metabolic pathways of H3B-6545 included deamination (M8 and M9), dealkylation (M2, M3 and M10), N-hydroxylation (M6), hydroxylation (M1 and M4), formation of amide derivatives (M5 and M7) and GSH conjugation (G1).
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Affiliation(s)
- Dong Zhang
- Department of Gastroenterology, Qingdao Center Hospital, Qingdao, Shandong Province, China
| | - Xiuxian Hao
- Department of Gastroenterology, Qingdao Center Hospital, Qingdao, Shandong Province, China
| | - Lili Xu
- Department of Endocrinology, the Affiliated Hospital of Qingdao University, Qingdao, Shandong Province, China
| | - Ying Yang
- Department of Gastroenterology, Qingdao Center Hospital, Qingdao, Shandong Province, China
| | - Hong Zhao
- Department of Gastroenterology, Qingdao Center Hospital, Qingdao, Shandong Province, China
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14
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He F, Zheng W, Chen Y, Mo C, Chen Y. Development and validation of a simple and sensitive high‐resolution LC/MS method for determination of PF‐04620110 in dog plasma: Application to a pharmacokinetic study. Biomed Chromatogr 2019; 33:e4562. [DOI: 10.1002/bmc.4562] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/15/2019] [Revised: 03/21/2019] [Accepted: 04/17/2019] [Indexed: 11/11/2022]
Affiliation(s)
- Fan He
- Guangzhou Women and Children's Medical Center Guangzhou China
| | - Wei Zheng
- Guangzhou Women and Children's Medical Center Guangzhou China
| | - Yongzhuang Chen
- Guangzhou Women and Children's Medical Center Guangzhou China
| | - Chengke Mo
- Guangzhou Women and Children's Medical Center Guangzhou China
| | - Yilu Chen
- Guangzhou Women and Children's Medical Center Guangzhou China
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15
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Yue X, Lu L, Liu H, Xue H. Pharmacokinetics, bioavailability and metabolism of cligosiban, an antagonist of oxytocin receptor, in rat by liquid chromatography hyphenated with electrospray ionization tandem mass spectrometry. J Pharm Biomed Anal 2019; 164:725-733. [PMID: 30472591 DOI: 10.1016/j.jpba.2018.11.045] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/15/2018] [Revised: 11/17/2018] [Accepted: 11/17/2018] [Indexed: 10/27/2022]
Abstract
Cligosiban is a highly-affinity nonpeptide oxytocin receptor antagonist. In this study, a simple an sensitive LC-MS/MS method was developed and validated for the determination of cligosiban in rat plasma. The plasma samples were pretreated with acetonitrile as precipitant and then separated on an ACQUITY BEH C18 column (2.1 × 50 mm, 1.7 μm) with 0.1% formic acid in water and acetonitrile as mobile phase. The analytes were monitored using selected reaction monitoring (SRM) mode with transitions at m/z 420.1→248.1 for cligosiban and m/z 304.1→161.1 for IS. The developed method showed good linearity over the concentration range of 1-1000 ng/mL with coefficient of correlation > 0.996. The lower limit of quantification (LLOQ) is 1 ng/mL. The method was validated for selectivity, precision, accuracy, recovery, and stability in accordance with FDA's guidance. The validated assay has been successfully applied to the pharmacokinetic study of cligosiban in rat plasma after intravenous and oral administration. According to the current results, the oral bioavailability of cligosiban was 63.82%. Furthermore, the metabolites present in rat liver microsomes (RLM), human liver microsomes (HLM) and rat plasma were analyzed by UHPLC-LTQ-Orbitrap-MS method, and four metabolites structurally identified based on their accurate masses, and fragment ions. The proposed metabolic pathways of cligosiban were demethylation and glucuronidation. This study is the first report on the pharmacokinetic and metabolic information of cligosiban, which would provide insights into the effectiveness and toxicity of cligosiban.
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Affiliation(s)
- Xueliang Yue
- Department of Hepatobiliary Surgery, Zhengzhou University People's Hospital & Henan Provincial People's Hospital, Zhengzhou, 450000, PR China
| | - Lingpan Lu
- Academy of Pharmacy and Chemical Engineering, Zhengzhou University of Industrial Technology, Zhengzhou, 451199, PR China
| | - Hongshan Liu
- Department of Hepatobiliary Surgery, Zhengzhou University People's Hospital & Henan Provincial People's Hospital, Zhengzhou, 450000, PR China
| | - Huanzhou Xue
- Department of Hepatobiliary Surgery, Zhengzhou University People's Hospital & Henan Provincial People's Hospital, Zhengzhou, 450000, PR China.
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16
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Ferreira P, Cerqueira NMFSA, Coelho C, Fernandes PA, Romão MJ, Ramos MJ. New insights about the monomer and homodimer structures of the human AOX1. Phys Chem Chem Phys 2019; 21:13545-13554. [DOI: 10.1039/c9cp01040h] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
We conducted MD simulations to provide a comprehensive study on the human aldehyde oxidase and on the impact that the allosteric inhibitor thioridazine and malonate ions have on its structure, particularly on the catalytic tunnel.
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Affiliation(s)
- P. Ferreira
- UCIBIO@REQUIMTE
- Departamento de Química e Bioquímica
- Faculdade de Ciências
- Universidade do Porto
- 4169-007 Porto
| | - N. M. F. S. A. Cerqueira
- UCIBIO@REQUIMTE
- Departamento de Química e Bioquímica
- Faculdade de Ciências
- Universidade do Porto
- 4169-007 Porto
| | - C. Coelho
- UCIBIO@REQUIMTE
- Departamento de Química
- Faculdade de Ciências e Tecnologia
- Universidade Nova de Lisboa
- 2829-516 Caparica
| | - P. A. Fernandes
- UCIBIO@REQUIMTE
- Departamento de Química e Bioquímica
- Faculdade de Ciências
- Universidade do Porto
- 4169-007 Porto
| | - M. J. Romão
- UCIBIO@REQUIMTE
- Departamento de Química
- Faculdade de Ciências e Tecnologia
- Universidade Nova de Lisboa
- 2829-516 Caparica
| | - M. J. Ramos
- UCIBIO@REQUIMTE
- Departamento de Química e Bioquímica
- Faculdade de Ciências
- Universidade do Porto
- 4169-007 Porto
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17
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He C, Wan H. Drug metabolism and metabolite safety assessment in drug discovery and development. Expert Opin Drug Metab Toxicol 2018; 14:1071-1085. [DOI: 10.1080/17425255.2018.1519546] [Citation(s) in RCA: 37] [Impact Index Per Article: 6.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/10/2023]
Affiliation(s)
- Chunyong He
- Department of DMPK/Tox, Shanghai Hengrui Pharmaceutical Co., Ltd., Shanghai, P. R. China
| | - Hong Wan
- Department of DMPK/Tox, Shanghai Hengrui Pharmaceutical Co., Ltd., Shanghai, P. R. China
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18
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Li Z, Zhang L, Yuan Y, Yang Z. Identification of metabolites of evobrutinib in rat and human hepatocytes by using ultra-high performance liquid chromatography coupled with diode array detector and Q Exactive Orbitrap tandem mass spectrometry. Drug Test Anal 2018; 11:129-139. [PMID: 30102849 DOI: 10.1002/dta.2477] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/16/2018] [Revised: 07/20/2018] [Accepted: 08/02/2018] [Indexed: 01/19/2023]
Affiliation(s)
- Zeyun Li
- Department of Pharmacy; the First Affiliated Hospital of Zhengzhou University; Zhengzhou China
| | - Lizhen Zhang
- Department of Pharmacy; the First Affiliated Hospital of Zhengzhou University; Zhengzhou China
| | - Yongliang Yuan
- Department of Pharmacy; the First Affiliated Hospital of Zhengzhou University; Zhengzhou China
| | - Zhiheng Yang
- Department of Pharmacy; the First Affiliated Hospital of Zhengzhou University; Zhengzhou China
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19
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Liu Z, Yang Y, Sheng L, Li Y. Interspecies Variation of In Vitro Stability and Metabolic Diversity of YZG-331, a Promising Sedative-Hypnotic Compound. Front Pharmacol 2017; 8:527. [PMID: 28848441 PMCID: PMC5554529 DOI: 10.3389/fphar.2017.00527] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/28/2017] [Accepted: 07/26/2017] [Indexed: 01/08/2023] Open
Abstract
YZG-331, a synthetic adenosine derivative, express the sedative and hypnotic effects via binding to the adenosine receptor. The current study was taken to investigate the metabolic pathway of YZG-331 as well as species-specific differences in vitro. YZG-331 was reduced by 14, 11, 6, 46, and 11% within 120 min incubation in human, monkey, dog, rat, and mouse liver microsomes (LMs), respectively. However, YZG-331 was stable in human, monkey, dog, rat, and mouse liver cytoplasm. In addition, YZG-331 was unstable in rat or mouse gut microbiota with more than 50% of prototype drug degraded within 120 min incubation. Interestingly, the systemic exposure of M2 and M3 in rats and mice treated with antibiotics were significantly decreased in the pseudo germ-free group. YZG-331 could be metabolized in rat and human liver under the catalysis of CYP enzymes, and the metabolism showed species variation. In addition, 3 phase I metabolites were identified via hydroxyl (M1), hydrolysis (M2), or hydrolysis/ hydroxyl (M3) pathway. Flavin-containing monooxygenase 1 (FMO1) and FMO3 participated in the conversion of YZG-331 in rat LMs. Nevertheless, YZG-331 expressed stability with recombinant human FMOs, which further confirmed the species variation in the metabolism. Overall, these studies suggested that YZG-331 is not stable in LMs and gut microbiota. CYP450 enzymes and FMOs mediated the metabolism of YZG-331, and the metabolic pathway showed species difference. Special attention must be paid when extrapolating data from other species to humans.
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Affiliation(s)
- Zhihao Liu
- Department of Drug Metabolism, Key Laboratory of Active Substances Discovery and Drug Ability Evaluation, State Key Laboratory of Bioactive Substance and Function of Natural Medicines, Institute of Materia Medica, Chinese Academy of Medical Sciences and Peking Union Medical CollegeBeijing, China.,Department of Clinical Pharmacology, College of Pharmacy, Dalian Medical UniversityDalian, China
| | - Yakun Yang
- Department of Drug Metabolism, Key Laboratory of Active Substances Discovery and Drug Ability Evaluation, State Key Laboratory of Bioactive Substance and Function of Natural Medicines, Institute of Materia Medica, Chinese Academy of Medical Sciences and Peking Union Medical CollegeBeijing, China
| | - Li Sheng
- Department of Drug Metabolism, Key Laboratory of Active Substances Discovery and Drug Ability Evaluation, State Key Laboratory of Bioactive Substance and Function of Natural Medicines, Institute of Materia Medica, Chinese Academy of Medical Sciences and Peking Union Medical CollegeBeijing, China
| | - Yan Li
- Department of Drug Metabolism, Key Laboratory of Active Substances Discovery and Drug Ability Evaluation, State Key Laboratory of Bioactive Substance and Function of Natural Medicines, Institute of Materia Medica, Chinese Academy of Medical Sciences and Peking Union Medical CollegeBeijing, China
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20
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He M, Ouyang H, He M, Tan T, Li J, Zhang X, Jia J, Feng Y, Yang S. Application of a liquid chromatography-tandem mass spectrometry method to the pharmacokinetics, tissue distribution and excretion in the study of anemoside B4, a novel antiviral agent candidate, in rats. Biomed Chromatogr 2017; 31. [DOI: 10.1002/bmc.3914] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/08/2016] [Revised: 11/30/2016] [Accepted: 12/02/2016] [Indexed: 12/27/2022]
Affiliation(s)
- Mingyu He
- Jiangxi University of Traditional Chinese Medicine; Nanchang People's Republic of China
| | - Hui Ouyang
- Jiangxi University of Traditional Chinese Medicine; Nanchang People's Republic of China
| | - Mingzhen He
- Jiangxi University of Traditional Chinese Medicine; Nanchang People's Republic of China
| | - Ting Tan
- Jiangxi University of Traditional Chinese Medicine; Nanchang People's Republic of China
| | - Junmao Li
- State Key Laboratory of Innovative Drug and Efficient Energy-Saving Pharmaceutical Equipment; Nanchang People's Republic of China
| | - Xiaoyong Zhang
- Jiangxi University of Traditional Chinese Medicine; Nanchang People's Republic of China
| | - Jia Jia
- Jiangxi University of Traditional Chinese Medicine; Nanchang People's Republic of China
| | - Yulin Feng
- State Key Laboratory of Innovative Drug and Efficient Energy-Saving Pharmaceutical Equipment; Nanchang People's Republic of China
| | - Shilin Yang
- Jiangxi University of Traditional Chinese Medicine; Nanchang People's Republic of China
- State Key Laboratory of Innovative Drug and Efficient Energy-Saving Pharmaceutical Equipment; Nanchang People's Republic of China
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21
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Li S, Klencsár B, Balcaen L, Cuyckens F, Lynen F, Vanhaecke F. Quantitative Metabolite Profiling of an Amino Group Containing Pharmaceutical in Human Plasma via Precolumn Derivatization and High-Performance Liquid Chromatography-Inductively Coupled Plasma Mass Spectrometry. Anal Chem 2017; 89:1907-1915. [PMID: 28050907 DOI: 10.1021/acs.analchem.6b04388] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
Abstract
Quantitative determination of the candidate drug molecule and its metabolites in biofluids and tissues is an inevitable step in the development of new pharmaceuticals. Because of the time-consuming and expensive nature of the current standard technique for quantitative metabolite profiling, i.e., radiolabeling followed by high-performance liquid chromatography (HPLC) with radiodetection, the development of alternative methodologies is of great interest. In this work, a simple, fast, sensitive, and accurate method for the quantitative metabolite profiling of an amino group containing drug (levothyroxine) and its metabolites in human plasma, based on precolumn derivatization followed by HPLC-inductively coupled plasma mass spectrometry (ICPMS), was developed and validated. To introduce a suitable "heteroelement" (defined here as an element that is detectable with ICPMS), an inexpensive and commercially available reagent, tetrabromophthalic anhydride (TBPA) was used for the derivatization of free NH2-groups. The presence of a known number of I atoms in both the drug molecule and its metabolites enabled a cross-validation of the newly developed derivatization procedure and quantification based on monitoring of the introduced Br. The formation of the derivatives was quantitative, providing a 4:1 stoichiometric Br/NH2 ratio. The derivatives were separated via reversed-phase HPLC with gradient elution. Bromine was determined via ICPMS at a mass-to-charge ratio of 79 using H2 as a reaction gas to ensure interference-free detection, and iodine was determined at a mass-to-charge ratio of 127 for cross-validation purposes. The method developed shows a fit-for-purpose accuracy (recovery between 85% and 115%) and precision (repeatability <15% RSD). The limit of quantification (LoQ) for Br was approximately 100 μg/L.
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Affiliation(s)
- Sanwang Li
- Department of Analytical Chemistry, Ghent University , Campus Sterre, Krijgslaan 281-S12, 9000 Ghent, Belgium
| | - Balázs Klencsár
- Department of Analytical Chemistry, Ghent University , Campus Sterre, Krijgslaan 281-S12, 9000 Ghent, Belgium
| | - Lieve Balcaen
- Department of Analytical Chemistry, Ghent University , Campus Sterre, Krijgslaan 281-S12, 9000 Ghent, Belgium
| | - Filip Cuyckens
- Pharmacokinetics, Dynamics & Metabolism, Janssen R&D , Turnhoutseweg 30, 2340 Beerse, Belgium
| | - Frederic Lynen
- Department of Organic and Macromolecular Chemistry, Ghent University , Campus Sterre, Krijgslaan 281-S4-bis, 9000 Ghent, Belgium
| | - Frank Vanhaecke
- Department of Analytical Chemistry, Ghent University , Campus Sterre, Krijgslaan 281-S12, 9000 Ghent, Belgium
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22
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Lu D, Dong D, Liu Z, Wang Y, Wu B. Metabolism elucidation of BJ-B11 (a heat shock protein 90 inhibitor) by human liver microsomes: identification of main contributing enzymes. Expert Opin Drug Metab Toxicol 2016; 11:1029-40. [PMID: 26073578 DOI: 10.1517/17425255.2015.1042858] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
Abstract
OBJECTIVE The aim of this article is to elucidate the metabolic pathways of BJ-B11, a heat shock protein 90 inhibitor, in human liver microsomes (HLM) and determine the main enzymes responsible for formation of each metabolite. METHODS Metabolites of BJ-B11 were identified using the ultra performance liquid chromatography- quadrupole time-of-flight/mass spectrometry (UPLC-QTOF/MS) method. Esterase contributing to the hydrolysis of BJ-B11 was identified by chemical inhibition and activity correlation assays. Reaction phenotyping and kinetic studies using expressed cytochrome P450 (CYP) enzymes were performed to determine the contributions of CYP isozymes to BJ-B11 metabolism. RESULTS BJ-B11 was rapidly hydrolyzed to generate a deacetylated product M1-1. M1-1 was subsequently metabolized to form eight metabolites. Hydrolysis of BJ-B11 was markedly inhibited by vinblastine (a dual inhibitor of arylacetamide deacetylase and carboxylesterase 2). By contrast, digitonin and telmisartan (the specific inhibitors for carboxylesterase 1 and carboxylesterase 2, respectively) did not inhibit BJ-B11 hydrolysis at all. Further, BJ-B11 hydrolysis was significantly correlated with hydrolysis of phenacetin (an activity marker of arylacetamide deacetylase). Moreover, reaction phenotyping revealed that metabolism of M1-1 in HLM was attributable to several CYP enzymes, including CYP1A1, 1B1, 3A4 and 3A5. CONCLUSION BJ-B11 was subjected to efficient metabolism in the liver, generating nine metabolites. BJ-B11 metabolism was contributed mainly by arylacetamide deacetylase and multiple CYP enzymes.
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Affiliation(s)
- Danyi Lu
- Jinan University, Division of Pharmaceutics, College of Pharmacy , 601 Huangpu Avenue West, Guangzhou 510632 , China
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23
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Hutchinson TH, Madden JC, Naidoo V, Walker CH. Comparative metabolism as a key driver of wildlife species sensitivity to human and veterinary pharmaceuticals. Philos Trans R Soc Lond B Biol Sci 2015; 369:rstb.2013.0583. [PMID: 25405970 DOI: 10.1098/rstb.2013.0583] [Citation(s) in RCA: 44] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023] Open
Abstract
Human and veterinary drug development addresses absorption, distribution, metabolism, elimination and toxicology (ADMET) of the Active Pharmaceutical Ingredient (API) in the target species. Metabolism is an important factor in controlling circulating plasma and target tissue API concentrations and in generating metabolites which are more easily eliminated in bile, faeces and urine. The essential purpose of xenobiotic metabolism is to convert lipid-soluble, non-polar and non-excretable chemicals into water soluble, polar molecules that are readily excreted. Xenobiotic metabolism is classified into Phase I enzymatic reactions (which add or expose reactive functional groups on xenobiotic molecules), Phase II reactions (resulting in xenobiotic conjugation with large water-soluble, polar molecules) and Phase III cellular efflux transport processes. The human-fish plasma model provides a useful approach to understanding the pharmacokinetics of APIs (e.g. diclofenac, ibuprofen and propranolol) in freshwater fish, where gill and liver metabolism of APIs have been shown to be of importance. By contrast, wildlife species with low metabolic competency may exhibit zero-order metabolic (pharmacokinetic) profiles and thus high API toxicity, as in the case of diclofenac and the dramatic decline of vulture populations across the Indian subcontinent. A similar threat looms for African Cape Griffon vultures exposed to ketoprofen and meloxicam, recent studies indicating toxicity relates to zero-order metabolism (suggesting P450 Phase I enzyme system or Phase II glucuronidation deficiencies). While all aspects of ADMET are important in toxicity evaluations, these observations demonstrate the importance of methods for predicting API comparative metabolism as a central part of environmental risk assessment.
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Affiliation(s)
- Thomas H Hutchinson
- School of Biological Sciences, University of Plymouth, Drake Circus, Plymouth PL4 8AA, UK
| | - Judith C Madden
- School of Pharmacy and Biomolecular Sciences, Liverpool John Moores University, Byrom Street, Liverpool L3 3AF, UK
| | - Vinny Naidoo
- Departmental of Paraclinical Sciences, Faculty of Veterinary Science, University of Pretoria, Private Bag X04, Onderstepoort, Gauteng 0110, South Africa
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Wang J, Hou T. Advances in computationally modeling human oral bioavailability. Adv Drug Deliv Rev 2015; 86:11-6. [PMID: 25582307 PMCID: PMC4490973 DOI: 10.1016/j.addr.2015.01.001] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/17/2014] [Revised: 11/03/2014] [Accepted: 01/05/2015] [Indexed: 12/15/2022]
Abstract
Although significant progress has been made in experimental high throughput screening (HTS) of ADME (absorption, distribution, metabolism, excretion) and pharmacokinetic properties, the ADME and Toxicity (ADME-Tox) in silico modeling is still indispensable in drug discovery as it can guide us to wisely select drug candidates prior to expensive ADME screenings and clinical trials. Compared to other ADME-Tox properties, human oral bioavailability (HOBA) is particularly important but extremely difficult to predict. In this paper, the advances in human oral bioavailability modeling will be reviewed. Moreover, our deep insight on how to construct more accurate and reliable HOBA QSAR and classification models will also discussed.
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Affiliation(s)
- Junmei Wang
- Green Center for Systems Biology, The University of Texas Southwestern Medical Center, 5323 Harry Hines Blvd. Dallas, TX 75390, USA.
| | - Tingjun Hou
- College of Pharmaceutical Sciences, Zhejiang University, Hangzhou, Zhejiang 310058, China
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25
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Liu X, Wang S, Ding L, Chen X, Shen W, Dong X, Yun C, Lin H. Liquid chromatography/quadrupole time-of-flight mass spectrometry in combination with online hydrogen/deuterium exchange technique for structural elucidation of phase I metabolites ofiso-phenylcyclopentylamine in rat bile. Biomed Chromatogr 2014; 28:1335-44. [DOI: 10.1002/bmc.3170] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/15/2013] [Revised: 01/20/2014] [Accepted: 01/28/2014] [Indexed: 11/08/2022]
Affiliation(s)
- Xiaoxue Liu
- Department of Pharmaceutical Analysis; China Pharmaceutical University; 24 Tongjiaxiang Nanjing 210009 China
| | - Suilou Wang
- Department of Pharmaceutical Analysis; China Pharmaceutical University; 24 Tongjiaxiang Nanjing 210009 China
| | - Li Ding
- Department of Pharmaceutical Analysis; China Pharmaceutical University; 24 Tongjiaxiang Nanjing 210009 China
| | - Xiaoping Chen
- Beijing Shiqiao Biological and Pharmaceutical Co. Ltd; Beijing China
| | - Wenbin Shen
- Center for instrumental analysis; China Pharmaceutical University; 24 Tongjiaxiang Nanjing 210009 China
| | - Xin Dong
- State Key Laboratory of Natural Medicines; China Pharmaceutical University; Nanjing 21009 China
| | - Changhong Yun
- Department of Pharmaceutical Analysis; China Pharmaceutical University; 24 Tongjiaxiang Nanjing 210009 China
| | - Hongda Lin
- Department of Pharmaceutical Analysis; China Pharmaceutical University; 24 Tongjiaxiang Nanjing 210009 China
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26
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Fortuna A, Alves G, Soares-da-Silva P, Falcão A. Pharmacokinetics, brain distribution and plasma protein binding of carbamazepine and nine derivatives: New set of data for predictive in silico ADME models. Epilepsy Res 2013; 107:37-50. [DOI: 10.1016/j.eplepsyres.2013.08.013] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/05/2013] [Revised: 06/29/2013] [Accepted: 08/08/2013] [Indexed: 01/27/2023]
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Quignot N. Modeling bioavailability to organs protected by biological barriers. In Silico Pharmacol 2013; 1:8. [PMID: 25505653 PMCID: PMC4230447 DOI: 10.1186/2193-9616-1-8] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/02/2013] [Accepted: 05/05/2013] [Indexed: 01/16/2023] Open
Abstract
Computational pharmacokinetic (PK) modeling gives access to drug concentration vs. time profiles in target organs and allows better interpretation of clinical observations of therapeutic or toxic effects. Physiologically-based PK (PBPK) models in particular, based on mechanistic descriptions of the body anatomy and physiology, may also help to extrapolate in vitro or animal data to human. Once in the systemic circulation, a chemical has access to the microvasculature of every organ or tissue. However, its penetration in the brain, retina, thymus, spinal cord, testis, placenta,… may be limited or even fully prevented by dynamic physiological blood-tissue barriers. Those barriers are both physical (involving tight junctions between adjacent cells) and biochemical (involving metabolizing enzymes and transporters). On those cases, correct mechanistic characterization of the passage (or not) of molecules through the barrier can be crucial for improved PBPK modeling and prediction. In parallel, attempts to understand and quantitatively characterize the processes involved in drug penetration of physiological barriers have led to the development of several in vitro experimental models. Data from such assays are very useful to calibrate PBPK models. We review here those in vitro and computational models, highlighting the challenges and perspectives for in vitro and computational models to better assess drug availability to target tissues.
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Affiliation(s)
- Nadia Quignot
- Bioengineering Department, Chair of Mathematical Modeling for Systems Toxicology, Université de Technologie de Compiègne, Royallieu Research Center, Compiègne, 60200 France ; LA-SER, Strategy and Decision Analytics, 10 place de la Catalogne, Paris, 75014 France
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28
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Reactions and enzymes in the metabolism of drugs and other xenobiotics. Drug Discov Today 2012; 17:549-60. [DOI: 10.1016/j.drudis.2012.01.017] [Citation(s) in RCA: 146] [Impact Index Per Article: 12.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/22/2011] [Revised: 12/06/2011] [Accepted: 01/20/2012] [Indexed: 01/28/2023]
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Pellegatti M. Preclinical in vivo ADME studies in drug development: a critical review. Expert Opin Drug Metab Toxicol 2012; 8:161-72. [PMID: 22248306 DOI: 10.1517/17425255.2012.652084] [Citation(s) in RCA: 31] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
Abstract
INTRODUCTION The last two decades have brought many fundamental changes to the drug development process. One such change is the importance of preclinical pharmacokinetics, which has become an essential part of early drug discovery. Furthermore, bioanalytical methods have become more sensitive and the identification and quantitation of metabolites can now be carried out on limited amount of biological material. There has also been a change in regulatory expectations, which are now particularly focused on the safety of human metabolites. AREAS COVERED The focus of this paper is on some 'traditional' in vivo ADME studies: excretion balance, metabolic profile and WBA in the toxicological species. These studies, performed with radiolabeled material, have a long history: and are a regular presence in submission dossiers. This paper reviews their value in the perspective of the contemporary drug development process. EXPERT OPINION These experiments may sometimes still be relevant to explain toxicological findings or for other special purposes but should not be considered required pieces of the registration dossiers. An appropriate investigation of samples coming from safety evaluation and human Phase I studies and the knowledge generated during the lead optimization phase provide, in most instances, all the DMPK information needed to take decisions in the drug development process.
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30
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Eichhorn P, Pérez S, Barceló D. Time-of-Flight Mass Spectrometry Versus Orbitrap-Based Mass Spectrometry for the Screening and Identification of Drugs and Metabolites. TOF-MS WITHIN FOOD AND ENVIRONMENTAL ANALYSIS - COMPREHENSIVE ANALYTICAL CHEMISTRY 2012. [DOI: 10.1016/b978-0-444-53810-9.00009-2] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
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Fortuna A, Alves G, Almeida A, Lopes B, Falcão A, Soares-da-Silva P. A chiral liquid chromatography method for the simultaneous determination of oxcarbazepine, eslicarbazepine, R-licarbazepine and other new chemical derivatives BIA 2-024, BIA 2-059 and BIA 2-265, in mouse plasma and brain. Biomed Chromatogr 2011; 26:384-92. [DOI: 10.1002/bmc.1670] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/26/2011] [Accepted: 06/08/2011] [Indexed: 11/06/2022]
Affiliation(s)
| | | | | | - Bruno Lopes
- Pharmacology Department; Faculty of Pharmacy; University of Coimbra; 3000-548; Coimbra; Portugal
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Bonnefille P, Sezgin-Bayindir Z, Belkhelfa H, Arellano C, Gandia P, Woodley J, Houin G. The use of isolated enterocytes to study Phase I intestinal drug metabolism: validation with rat and pig intestine. Fundam Clin Pharmacol 2010; 25:104-14. [DOI: 10.1111/j.1472-8206.2010.00904.x] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/01/2022]
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Jennen DGJ, Gaj S, Giesbertz PJ, van Delft JHM, Evelo CT, Kleinjans JCS. Biotransformation pathway maps in WikiPathways enable direct visualization of drug metabolism related expression changes. Drug Discov Today 2010; 15:851-8. [PMID: 20708095 DOI: 10.1016/j.drudis.2010.08.002] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/10/2010] [Revised: 06/25/2010] [Accepted: 08/04/2010] [Indexed: 12/18/2022]
Abstract
In recent decades, our knowledge of the genetics and functional genomics of drug-metabolizing enzymes has increased and a wealth of data on drug-related 'omics' has become available. Despite the availability of large amounts of biological information on xenobiotic biotransformation, the number of available biotransformation pathway maps that can easily be used for visualization of multiple omics data is limited. Here, we created integrated biotransformation pathway maps suitable for multiple omics analysis using PathVisio. The ease of visualizing data on these maps was demonstrated by using published microarray data from human hepatocyte-like cell models, exemplifying - where a sufficient capacity for metabolizing chemicals is a prerequisite for a suited model - how the biotransformation pathway maps can be used for model selection.
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Affiliation(s)
- Danyel G J Jennen
- Department of Health Risk Analysis and Toxicology, Maastricht University, The Netherlands.
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Feng B, LaPerle JL, Chang G, Varma MVS. Renal clearance in drug discovery and development: molecular descriptors, drug transporters and disease state. Expert Opin Drug Metab Toxicol 2010; 6:939-52. [DOI: 10.1517/17425255.2010.482930] [Citation(s) in RCA: 72] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
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Abstract
The purpose of this contribution is to review new technologies and make an educated prediction as to how they will impact veterinary pharmacology over the coming decades. By examining past developments, it becomes evident that change is incremental and predictable unless either a transforming discovery or a change in societal behaviour occurs. In the last century, both discoveries and behaviours have dramatically changed medicine, pharmacology and therapeutics. In this chapter, the potential effects of six transforming technologies on veterinary therapeutics are examined: continued advances in computer technology, microfluidics, nanotechnology, high-throughput screening, control and targeted drug delivery and pharmacogenomics. These should lead to the more efficacious and safer use of existing medicants, and the development of novel drugs across most therapeutic classes through increases in our knowledge base, as well as more efficient drug development. Although this growth in technology portends major advances over the next few decades, economic and regulatory constraints must still be overcome for these new drugs or therapeutic approaches to become common practise.
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Affiliation(s)
- Jim E Riviere
- Center for Chemical Toxicology Research and Pharmacokinetics, Department of Population Health and Pathobiology, College of Veterinary Medicine, North Carolina State University, Raleigh, North Carolina 27606, USA.
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Sharma P, Holmes VE, Elsby R, Lambert C, Surry D. Validation of cell-based OATP1B1 assays to assess drug transport and the potential for drug–drug interaction to support regulatory submissions. Xenobiotica 2009; 40:24-37. [DOI: 10.3109/00498250903351013] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
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Patel JP, Brocks DR. The effect of oral lipids and circulating lipoproteins on the metabolism of drugs. Expert Opin Drug Metab Toxicol 2009; 5:1385-98. [DOI: 10.1517/17425250903176439] [Citation(s) in RCA: 28] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
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Wang J, Hou T. Chapter 5 Recent Advances on in silico ADME Modeling. ACTA ACUST UNITED AC 2009. [DOI: 10.1016/s1574-1400(09)00505-2] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/06/2023]
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Abstract
Drug Discovery in modern times straddles three main periods. The first notable period can be traced to the nineteenth century where the basis of drug discovery relied on the serendipity of the medicinal chemists. The second period commenced around the early twentieth century when new drug structures were found, which contributed for a new era of antibiotics discovery. Based on these known structures, and with the development of powerful new techniques such as molecular modelling, combinatorial chemistry, and automated high-throughput screening, rapid advances occurred in drug discovery towards the end of the century. The period also was revolutionized by the emergence of recombinant DNA technology, where it became possible to develop potential drugs target candidates. With all the expansion of new technologies and the onset of the "Omics" revolution in the twenty-first century, the third period has kick-started with an increase in biopharmaceutical drugs approved by FDA/EMEA for therapeutic use.
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Affiliation(s)
- Ana Sofia Pina
- REQUIMTE, Department of Chemistry, Faculdade de Ciências e Tecnologia, Universidade Nova de Lisboa, Caparica, Portugal
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Smith J, Stein V. SPORCalc: A development of a database analysis that provides putative metabolic enzyme reactions for ligand-based drug design. Comput Biol Chem 2008; 33:149-59. [PMID: 19157988 DOI: 10.1016/j.compbiolchem.2008.11.002] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/06/2008] [Accepted: 11/12/2008] [Indexed: 10/21/2022]
Abstract
Understanding both the enzyme reactions that contribute to intermediate metabolism and the biochemical fate of candidate therapeutic and toxic agents are essential for drug design. Traditional metabolic databases indicate whether reactions have been observed but do not provide the likelihoods of reactions occurring, for example those of mixed function oxygenases and oxidases, during phase I metabolism. The desire for more quantitative predictions motivated the development of the recently introduced Substrate Product Occurrence Ratio Calculator (SPORCalc) that identifies metabolically labile atom positions in candidate compounds. This paper describes a further development and provides a clearer explanation of SPORCalc for the computational pharmacology, medicinal chemistry and drug design communities interested in metabolic prediction of xenobiotics using chemical databases of biotransformations. Examples of reaction centre detection in Metabolite are described followed by a demonstration of almokalant, an anti-arrhythmic agent, undergoing phase I metabolism. In general, occurrence ratio (OR) values are calculated throughout a compound and its transformed metabolites to give propensity (p) values at each atom position. The OR values from substrates and products in the database are essential for addition and elimination reactions. For almokalant, the resulting p values ranged from 10(-1) to 10(-5) and their order of magnitude reflected the known and experimentally observed metabolites. SPORCalc depends entirely on the level of detail from isoform- or species-specific reaction classes in Metabolite. Labile atom positions (sites of metabolism) are identified in both the candidate compound and its metabolites. In general, the likelihood of one enzyme isoform-dependent reaction occurring relative to another and the putative metabolic routes from different isoforms can be investigated. SPORCalc can be developed further to include suitable three-dimensional, structure-activity and physiochemical information.
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Affiliation(s)
- James Smith
- Department of Chemistry, University of Cambridge, Lensfield Road, Cambridge CB2 1EW, United Kingdom
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Elsby R, Surry DD, Smith VN, Gray AJ. Validation and application of Caco-2 assays for thein vitroevaluation of development candidate drugs as substrates or inhibitors of P-glycoprotein to support regulatory submissions. Xenobiotica 2008; 38:1140-64. [DOI: 10.1080/00498250802050880] [Citation(s) in RCA: 77] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/23/2023]
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Pharmacogenetics of P450 oxidoreductase: effect of sequence variants on activities of CYP1A2 and CYP2C19. Pharmacogenet Genomics 2008; 18:569-76. [DOI: 10.1097/fpc.0b013e32830054ac] [Citation(s) in RCA: 90] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/28/2023]
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Riviere JE. The future of veterinary therapeutics: A glimpse towards 2030. Vet J 2007; 174:462-71. [PMID: 17825591 DOI: 10.1016/j.tvjl.2007.06.022] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/04/2007] [Revised: 06/01/2007] [Accepted: 06/26/2007] [Indexed: 10/22/2022]
Abstract
The purpose of this article is to make an educated guess as to what veterinary pharmacology will look like in two decades. By examining the past, it is evident that change is incremental unless a transforming discovery occurs. In the last few decades, such events have dramatically changed medicine and pharmacology, however they have not percolated through the system to the effect that novel drugs have replaced our traditional armamentarium. The effect of six transforming technologies (continued advances in computer technology, microfluidics, nanotechnology, high-throughput screening, control and targeted drug delivery, pharmacogenomics) on veterinary therapeutics is examined. These should lead toward more efficacious and safer drugs across most therapeutic classes due to both increases in our knowledge base as well as more efficient drug development. Shorter term improvements in drug delivery should be seen. Although this growth in technology would portend major advances over the next few decades, economic and regulatory constraints must still be overcome for these new drugs or therapeutic approaches to become common practice.
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Affiliation(s)
- Jim E Riviere
- Center for Chemical Toxicology Research and Pharmacokinetics, Department of Population Health and Pathobiology, College of Veterinary Medicine, North Carolina State University, Raleigh, NC 27606, USA.
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Rutigliano DN, Meyers P, Ghossein RA, Carlson DL, Kayton ML, Kraus D, La Quaglia MP. Mucoepidermoid carcinoma as a secondary malignancy in pediatric sarcoma. J Pediatr Surg 2007; 42:E9-13. [PMID: 17618873 DOI: 10.1016/j.jpedsurg.2007.04.028] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
Abstract
PURPOSE Children diagnosed with osteosarcoma (OS) and Ewing sarcoma (ES) have greatly benefited from the addition of alkylator therapy. However, with greater numbers of long-term survivors, the rising incidence of secondary malignant neoplasms (SMNs) is concerning. Herein we report on 2 patients with sarcoma who developed a case of secondary mucoepidermoid carcinoma after chemotherapy treatment without associated radiation therapy. To our knowledge, this is the first series of mucoepidermoid carcinomas arising in pediatric patients treated for sarcoma without radiotherapy. METHODS Long-term survivors of OS and ES currently undergoing routine follow-up care were reviewed and noted for the development of a new secondary malignancy. Details of their initial evaluation, previous therapies, resection techniques, pathologic findings, and follow-up compose this report. RESULTS Two patients, a 17-year-old adolescent boy with OS and 16-year-old adolescent girl with ES, with secondary mucoepidermoid carcinoma of the parotid gland were identified. Both patients underwent primary resection and chemotherapy including alkylating agents, but neither received radiation. The mucoepidermoid carcinomas developed 27 months and 132 months after completion of therapy, respectively, and were noted on routine yearly follow-up. Fine-needle aspiration was nondiagnostic on each, and parotidectomy with preservation of the facial nerve was performed. Pathology revealed low-grade mucoepidermoid carcinoma with tumor extending to the deep margins for both lesions, and radiotherapy to the parotid bed was administered. There were no surgical complications. One patient is alive, without evidence of recurrent mucoepidermoid carcinoma after 4 years; the other recently completed radiotherapy and is disease-free after 12 months. CONCLUSION Primary mucoepidermoid carcinoma of the parotid gland accounts for less than 10% of all head and neck tumors in childhood. Previous series of secondary mucoepidermoid carcinoma have demonstrated an increased risk in patients with leukemia/lymphoma. This is the first reported series of parotid mucoepidermoid carcinomas occurring after sarcoma treatment without radiotherapy. A common link between the 2 patients may be the use of alkylating therapy.
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Affiliation(s)
- Daniel N Rutigliano
- Department of Surgery, Division of Pediatric Surgery, Memorial Sloan-Kettering Cancer Center, New York, NY 10021, USA
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