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Lü J, Zhang D, Zhang X, Sa R, Wang X, Wu H, Lin Z, Zhang B. Network Analysis of the Herb-Drug Interactions of Citrus Herbs Inspired by the "Grapefruit Juice Effect". ACS OMEGA 2022; 7:35911-35923. [PMID: 36249376 PMCID: PMC9558717 DOI: 10.1021/acsomega.2c04579] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 07/20/2022] [Accepted: 09/20/2022] [Indexed: 06/16/2023]
Abstract
This study was performed to investigate the herb-drug interactions (HDIs) of citrus herbs (CHs), which was inspired by the "grapefruit (GF) juice effect". Based on network analysis, a total of 249 components in GF and 159 compounds in CHs exhibited great potential as active ingredients. Moreover, 360 GF-related genes, 422 CH-related genes, and 111 genes associated with drug transport and metabolism were collected, while 25 and 26 overlapping genes were identified. In compound-target networks, the degrees of naringenin, isopimpinellin, apigenin, sinensetin, and isoimperatorin were higher, and the results of protein-protein interaction indicated the hub role of UGT1A1 and CYP3A4. Conventional drugs such as erlotinib, nilotinib, tamoxifen, theophylline, venlafaxine, and verapamil were associated with GF and CHs via multiple drug transporters and drug-metabolizing enzymes. Remarkably, GF and CHs shared 48 potential active compounds, among which naringenin, tangeretin, nobiletin, and apigenin possessed more interactions with targets. Drug metabolism by cytochrome P450 stood out in the mutual mechanism of GF and CHs. Molecular docking was utilized to elevate the protein-ligand binding potential of naringenin, tangeretin, nobiletin, and apigenin with UGT1A1 and CYP3A4. Furthermore, in vitro experiments demonstrated their regulating effect. Overall, this approach provided predictions on the HDIs of CHs, and they were tentatively verified through molecular docking and cell tests. Moreover, there is a demand for clinical and experimental evidence to support the prediction.
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Affiliation(s)
- Jintao Lü
- School
of Chinese Materia Medica, Beijing University
of Chinese Medicine, Beijing 102488, China
- Center
for Pharmacovigilance and Rational Use of Chinese Medicine, Beijing University of Chinese Medicine, Beijing 102488, China
| | - Dan Zhang
- School
of Chinese Materia Medica, Beijing University
of Chinese Medicine, Beijing 102488, China
- Center
for Pharmacovigilance and Rational Use of Chinese Medicine, Beijing University of Chinese Medicine, Beijing 102488, China
| | - Xiaomeng Zhang
- School
of Chinese Materia Medica, Beijing University
of Chinese Medicine, Beijing 102488, China
- Center
for Pharmacovigilance and Rational Use of Chinese Medicine, Beijing University of Chinese Medicine, Beijing 102488, China
| | - Rina Sa
- School
of Chinese Materia Medica, Beijing University
of Chinese Medicine, Beijing 102488, China
- Center
for Pharmacovigilance and Rational Use of Chinese Medicine, Beijing University of Chinese Medicine, Beijing 102488, China
- Gansu
Province Hospital, Lanzhou 730000, China
| | - Xiaofang Wang
- School
of Chinese Materia Medica, Beijing University
of Chinese Medicine, Beijing 102488, China
- Center
for Pharmacovigilance and Rational Use of Chinese Medicine, Beijing University of Chinese Medicine, Beijing 102488, China
| | - Huanzhang Wu
- School
of Chinese Materia Medica, Beijing University
of Chinese Medicine, Beijing 102488, China
- Center
for Pharmacovigilance and Rational Use of Chinese Medicine, Beijing University of Chinese Medicine, Beijing 102488, China
| | - Zhijian Lin
- School
of Chinese Materia Medica, Beijing University
of Chinese Medicine, Beijing 102488, China
- Center
for Pharmacovigilance and Rational Use of Chinese Medicine, Beijing University of Chinese Medicine, Beijing 102488, China
| | - Bing Zhang
- School
of Chinese Materia Medica, Beijing University
of Chinese Medicine, Beijing 102488, China
- Center
for Pharmacovigilance and Rational Use of Chinese Medicine, Beijing University of Chinese Medicine, Beijing 102488, China
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2
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Ridhwan MJM, Bakar SIA, Latip NA, Ghani NA, Ismail NH. A Comprehensive Analysis of Human CYP3A4 Crystal Structures as a Potential Tool for Molecular Docking-Based Site of Metabolism and Enzyme Inhibition Studies. JOURNAL OF COMPUTATIONAL BIOPHYSICS AND CHEMISTRY 2022; 21:259-285. [DOI: 10.1142/s2737416522300012] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 09/02/2023]
Abstract
The notable ability of human liver cytochrome P450 3A4 (CYP3A4) to metabolize diverse xenobiotics encourages researchers to explore in-depth the mechanism of enzyme action. Numerous CYP3A4 protein crystal structures have been deposited in protein data bank (PDB) and are majorly used in molecular docking analysis. The quality of the molecular docking results depends on the three-dimensional CYP3A4 protein crystal structures from the PDB. Present review endeavors to provide a brief outline of some technical parameters of CYP3A4 PDB entries as valuable information for molecular docking research. PDB entries between 22 April 2004 and 2 June 2021 were compiled and the active sites were thoroughly observed. The present review identified 76 deposited PDB entries and described basic information that includes CYP3A4 from human genetic, Escherichia coli (E. coli) use for protein expression, crystal structure obtained from X-ray diffraction method, taxonomy ID 9606, Uniprot ID P08684, ligand–protein structure description, co-crystal ligand, protein site deposit and resolution ranges between 1.7[Formula: see text]Å and 2.95[Formula: see text]Å. The observation of protein–ligand interactions showed the various residues on the active site depending on the ligand. The residues Ala305, Ser119, Ala370, Phe304, Phe108, Phe213 and Phe215 have been found to frequently interact with ligands from CYP3A4 PDB. Literature surveys of 17 co-crystal ligands reveal multiple mechanisms that include competitive inhibition, noncompetitive inhibition, mixed-mode inhibition, mechanism-based inhibition, substrate with metabolite, inducer, or combination modes of action. This overview may help researchers choose a trustworthy CYP3A4 protein structure from the PDB database to apply the protein in molecular docking analysis for drug discovery.
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Affiliation(s)
- Mohamad Jemain Mohamad Ridhwan
- Faculty of Applied Sciences, Universiti Teknologi MARA (UiTM), Shah Alam 40450, Selangor, Malaysia
- Atta-ur-Rahman Institute for Natural Products Discovery, Universiti Teknologi MARA (UiTM), Puncak Alam 42300, Selangor, Malaysia
| | - Syahrul Imran Abu Bakar
- Faculty of Applied Sciences, Universiti Teknologi MARA (UiTM), Shah Alam 40450, Selangor, Malaysia
- Atta-ur-Rahman Institute for Natural Products Discovery, Universiti Teknologi MARA (UiTM), Puncak Alam 42300, Selangor, Malaysia
| | - Normala Abd Latip
- Atta-ur-Rahman Institute for Natural Products Discovery, Universiti Teknologi MARA (UiTM), Puncak Alam 42300, Selangor, Malaysia
- Faculty of Pharmacy, Universiti Teknologi MARA (UiTM), Puncak Alam 42300, Selangor, Malaysia
| | - Nurunajah Ab Ghani
- Faculty of Applied Sciences, Universiti Teknologi MARA (UiTM), Shah Alam 40450, Selangor, Malaysia
- Atta-ur-Rahman Institute for Natural Products Discovery, Universiti Teknologi MARA (UiTM), Puncak Alam 42300, Selangor, Malaysia
| | - Nor Hadiani Ismail
- Faculty of Applied Sciences, Universiti Teknologi MARA (UiTM), Shah Alam 40450, Selangor, Malaysia
- Atta-ur-Rahman Institute for Natural Products Discovery, Universiti Teknologi MARA (UiTM), Puncak Alam 42300, Selangor, Malaysia
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3
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Riffle M, Hoopmann MR, Jaschob D, Zhong G, Moritz RL, MacCoss MJ, Davis TN, Isoherranen N, Zelter A. Discovery and Visualization of Uncharacterized Drug-Protein Adducts Using Mass Spectrometry. Anal Chem 2022; 94:3501-3509. [PMID: 35184559 PMCID: PMC8892443 DOI: 10.1021/acs.analchem.1c04101] [Citation(s) in RCA: 6] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Abstract
![]()
Drugs are often metabolized
to reactive intermediates that form
protein adducts. Adducts can inhibit protein activity, elicit immune
responses, and cause life-threatening adverse drug reactions. The
masses of reactive metabolites are frequently unknown, rendering traditional
mass spectrometry-based proteomics approaches incapable of adduct
identification. Here, we present Magnum, an open-mass search algorithm
optimized for adduct identification, and Limelight, a web-based data
processing package for analysis and visualization of data from all
existing algorithms. Limelight incorporates tools for sample comparisons
and xenobiotic-adduct discovery. We validate our tools with three
drug/protein combinations and apply our label-free workflow to identify
novel xenobiotic-protein adducts in CYP3A4. Our new methods and software
enable accurate identification of xenobiotic-protein adducts with
no prior knowledge of adduct masses or protein targets. Magnum outperforms
existing label-free tools in xenobiotic-protein adduct discovery,
while Limelight fulfills a major need in the rapidly developing field
of open-mass searching, which until now lacked comprehensive data
visualization tools.
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Affiliation(s)
- Michael Riffle
- Department of Biochemistry, University of Washington, Seattle, Washington 98195, United States
| | | | - Daniel Jaschob
- Department of Biochemistry, University of Washington, Seattle, Washington 98195, United States
| | - Guo Zhong
- Department of Pharmaceutics, University of Washington, Seattle, Washington 98195, United States
| | - Robert L Moritz
- Institute for Systems Biology, Seattle, Washington 98109, United States
| | - Michael J MacCoss
- Department of Genome Sciences, University of Washington, Seattle, Washington 98195, United States
| | - Trisha N Davis
- Department of Biochemistry, University of Washington, Seattle, Washington 98195, United States
| | - Nina Isoherranen
- Department of Pharmaceutics, University of Washington, Seattle, Washington 98195, United States
| | - Alex Zelter
- Department of Biochemistry, University of Washington, Seattle, Washington 98195, United States
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4
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Guengerich FP. Inhibition of Cytochrome P450 Enzymes by Drugs-Molecular Basis and Practical Applications. Biomol Ther (Seoul) 2022; 30:1-18. [PMID: 34475272 PMCID: PMC8724836 DOI: 10.4062/biomolther.2021.102] [Citation(s) in RCA: 17] [Impact Index Per Article: 8.5] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/22/2021] [Accepted: 07/22/2021] [Indexed: 11/05/2022] Open
Abstract
Drug-drug interactions are a major cause of hospitalization and deaths related to drug use. A large fraction of these is due to inhibition of enzymes involved in drug metabolism and transport, particularly cytochrome P450 (P450) enzymes. Understanding basic mechanisms of enzyme inhibition is important, particularly in terms of reversibility and the use of the appropriate parameters. In addition to drug-drug interactions, issues have involved interactions of drugs with foods and natural products related to P450 enzymes. Predicting drug-drug interactions is a major effort in drug development in the pharmaceutical industry and regulatory agencies. With appropriate in vitro experiments, it is possible to stratify clinical drug-drug interaction studies. A better understanding of drug interactions and training of physicians and pharmacists has developed. Finally, some P450s have been the targets of drugs in some cancers and other disease states.
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Affiliation(s)
- F. Peter Guengerich
- Department of Biochemistry, Vanderbilt University School of Medicine, Nashville, TN 37232-0146, USA
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5
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Bertuccioli A, Cardinali M, Di Pierro F, Magi S, Zonzini G. A Practical Perspective on the Use of Botanicals During the Covid-19 Pandemic: From Proven to Potential Interactions. J Med Food 2021; 25:1-11. [PMID: 34788575 PMCID: PMC8787711 DOI: 10.1089/jmf.2021.0062] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022] Open
Abstract
In this review, we examined the top 10 nutraceutical products sold in Italian pharmacies and parapharmacies as well as hypermarkets and supermarkets; in the first, three product categories saw the greatest increase in sales (vitamins and minerals, immunostimulants, and sleep products) for the 12-month period between October 2019 and October 2020 (including first pandemic wave of SARS-CoV-2). We are investigating their respective formulas and isolating the botanicals that are used to make them. Many of these products have undergone preclinical and clinical studies. We performed a systematic literature search in the MEDLINE database using PubMed and Google Scholar from November 15, 2020 to December 15, 2020 (including studies carried out between 1980 and 2020). The search terms that were used included the complete name of the medicinal plant in English or Latin and the terms “cytochrome” or “drug interactions,” crossing, respectively, the Latin name and English common names with “cytochrome” and “drug interactions.” The search included in vitro and in vivo studies describing the effects of interaction between the plant (extract or botanical medicine) and human cytochromes. Despite their great complexity, there is decidedly limited clinical data on botanical medicine. In fact, of the 28 botanicals that were examined, only 2 (Citrus paradisi and Rhodiola rosea) show in vivo pharmacological interactions in human subjects. On the contrary, for the other botanicals, there is only weak evidence of dubious clinical significance or potential interactions shown in animal models or in vitro without clinical confirmation. This study provides a rational assessment of the most widely used products, including those used in self-medication, to simplify patient management during the COVID-19 health emergency.
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Affiliation(s)
| | - Marco Cardinali
- Department of Internal Medicine, Infermi Hospital, AUSL Romagna, Rimini, Italy
| | - Francesco Di Pierro
- Digestive Endoscopy Unit and Gastroenterology, Fondazione Poliambulanza, Brescia, Italy.,Scientific & Research Department, Velleja Research, Milano, Italy
| | - Simone Magi
- Italian Association of Fitness e Medicine (AIFeM), Ravenna, Italy
| | - Giordano Zonzini
- Italian Association of Fitness e Medicine (AIFeM), Ravenna, Italy
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6
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Parallel evolution of UbiA superfamily proteins into aromatic O-prenyltransferases in plants. Proc Natl Acad Sci U S A 2021; 118:2022294118. [PMID: 33883279 DOI: 10.1073/pnas.2022294118] [Citation(s) in RCA: 10] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022] Open
Abstract
Plants produce ∼300 aromatic compounds enzymatically linked to prenyl side chains via C-O bonds. These O-prenylated aromatic compounds have been found in taxonomically distant plant taxa, with some of them being beneficial or detrimental to human health. Although their O-prenyl moieties often play crucial roles in the biological activities of these compounds, no plant gene encoding an aromatic O-prenyltransferase (O-PT) has been isolated to date. This study describes the isolation of an aromatic O-PT gene, CpPT1, belonging to the UbiA superfamily, from grapefruit (Citrus × paradisi, Rutaceae). This gene was shown responsible for the biosynthesis of O-prenylated coumarin derivatives that alter drug pharmacokinetics in the human body. Another coumarin O-PT gene encoding a protein of the same family was identified in Angelica keiskei, an apiaceous medicinal plant containing pharmaceutically active O-prenylated coumarins. Phylogenetic analysis of these O-PTs suggested that aromatic O-prenylation activity evolved independently from the same ancestral gene in these distant plant taxa. These findings shed light on understanding the evolution of plant secondary (specialized) metabolites via the UbiA superfamily.
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7
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Yasuda K, Watanabe K, Fukami T, Nakashima S, Ikushiro SI, Nakajima M, Sakaki T. Epicatechin gallate and epigallocatechin gallate are potent inhibitors of human arylacetamide deacetylase. Drug Metab Pharmacokinet 2021; 39:100397. [PMID: 34171773 DOI: 10.1016/j.dmpk.2021.100397] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/24/2020] [Revised: 03/21/2021] [Accepted: 04/06/2021] [Indexed: 11/29/2022]
Abstract
Recently, in addition to carboxylesterases (CESs), we found that arylacetamide deacetylase (AADAC) plays an important role in the metabolism of some clinical drugs. In this study, we screened for food-related natural compounds that could specifically inhibit human AADAC, CES1, or CES2. AADAC, CES1, and CES2 activities in human liver microsomes were measured using phenacetin, fenofibrate, and procaine as specific substrates, respectively. In total, 43 natural compounds were screened for their inhibitory effects on each of these enzymes. Curcumin and quercetin showed strong inhibitory effects against all three enzymes, whereas epicatechin, epicatechin gallate (ECg), and epigallocatechin gallate (EGCg) specifically inhibited AADAC. In particular, ECg and EGCg showed strong inhibitory effects on AADAC (IC50 values: 3.0 ± 0.5 and 2.2 ± 0.2 μM, respectively). ECg and EGCg also strongly inhibited AADAC-mediated rifampicin hydrolase activity in human liver microsomes with IC50 values of 2.2 ± 1.4 and 1.7 ± 0.4 μM, respectively, whereas it weakly inhibited p-nitrophenyl acetate hydrolase activity, which is catalyzed by AADAC, CES1, and CES2. Our results indicate that ECg and EGCg are potent inhibitors of AADAC.
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Affiliation(s)
- Kaori Yasuda
- Department of Pharmaceutical Engineering, Faculty of Engineering, Toyama Prefectural University, 5180 Kurokawa, Imizu, Toyama 939-0398, Japan.
| | - Kazuki Watanabe
- Department of Biotechnology, Faculty of Engineering, Toyama Prefectural University, 5180 Kurokawa, Imizu, Toyama, 939-0398, Japan
| | - Tatsuki Fukami
- Drug Metabolism and Toxicology, Faculty of Pharmaceutical Sciences, Kanazawa University Kakuma-machi, Kanazawa 920-1192, Japan; WPI Nano Life Science Institute, Kanazawa University, Kakuma-machi, Kanazawa 920-1192, Japan
| | - Shimon Nakashima
- Drug Metabolism and Toxicology, Faculty of Pharmaceutical Sciences, Kanazawa University Kakuma-machi, Kanazawa 920-1192, Japan
| | - Shin-Ichi Ikushiro
- Department of Biotechnology, Faculty of Engineering, Toyama Prefectural University, 5180 Kurokawa, Imizu, Toyama, 939-0398, Japan
| | - Miki Nakajima
- Drug Metabolism and Toxicology, Faculty of Pharmaceutical Sciences, Kanazawa University Kakuma-machi, Kanazawa 920-1192, Japan; WPI Nano Life Science Institute, Kanazawa University, Kakuma-machi, Kanazawa 920-1192, Japan
| | - Toshiyuki Sakaki
- Department of Pharmaceutical Engineering, Faculty of Engineering, Toyama Prefectural University, 5180 Kurokawa, Imizu, Toyama 939-0398, Japan
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8
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Guengerich FP. A history of the roles of cytochrome P450 enzymes in the toxicity of drugs. Toxicol Res 2021; 37:1-23. [PMID: 32837681 PMCID: PMC7431904 DOI: 10.1007/s43188-020-00056-z] [Citation(s) in RCA: 57] [Impact Index Per Article: 19.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/22/2020] [Revised: 05/22/2020] [Accepted: 06/11/2020] [Indexed: 02/07/2023] Open
Abstract
The history of drug metabolism began in the 19th Century and developed slowly. In the mid-20th Century the relationship between drug metabolism and toxicity became appreciated, and the roles of cytochrome P450 (P450) enzymes began to be defined in the 1960s. Today we understand much about the metabolism of drugs and many aspects of safety assessment in the context of a relatively small number of human P450s. P450s affect drug toxicity mainly by either reducing exposure to the parent molecule or, in some cases, by converting the drug into a toxic entity. Some of the factors involved are enzyme induction, enzyme inhibition (both reversible and irreversible), and pharmacogenetics. Issues related to drug toxicity include drug-drug interactions, drug-food interactions, and the roles of chemical moieties of drug candidates in drug discovery and development. The maturation of the field of P450 and drug toxicity has been facilitated by advances in analytical chemistry, computational capability, biochemistry and enzymology, and molecular and cell biology. Problems still arise with P450s and drug toxicity in drug discovery and development, and in the pharmaceutical industry the interaction of scientists in medicinal chemistry, drug metabolism, and safety assessment is critical for success.
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Affiliation(s)
- F. Peter Guengerich
- Department of Biochemistry, Vanderbilt University School of Medicine, 638B Robinson Research Building, 2200 Pierce Avenue, Nashville, TN 37232-0146 USA
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9
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Bergaptol, a mechanism-based inactivator of CYP2C9. Med Chem Res 2020. [DOI: 10.1007/s00044-020-02564-x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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10
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Citrus × Clementina Hort. Juice Enriched with Its By-Products (Peels and Leaves): Chemical Composition, In Vitro Bioactivity, and Impact of Processing. Antioxidants (Basel) 2020; 9:antiox9040298. [PMID: 32260119 PMCID: PMC7222210 DOI: 10.3390/antiox9040298] [Citation(s) in RCA: 13] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/09/2020] [Revised: 03/29/2020] [Accepted: 04/01/2020] [Indexed: 12/22/2022] Open
Abstract
This work investigated a model for the reuse of Citrus × clementina Hort. by-products for the development of a functional drink able to exert antioxidant, hypoglycaemic, and hypolipidemic effects. Juice obtained from fruits collected in three different areas of Calabria (Italy) was analysed. C. × clementina juice from Corigliano Calabro (JF), characterized by the highest content of bioactive compounds and bioactivity, was chosen as a matrix to be enrichment with hydroalcoholic ultrasound-assisted maceration of C. × clementina leaf from Corigliano Calabro (CO2) and ethanol ultrasound-assisted maceration of C. × clementina peel from Cetraro (BC3) extracts at different concentrations. The highest phytochemical content and bioactivities were found in juice enriched with leaf and leaf + peel extracts, with particular reference to antioxidant activity. In order to estimate the effects of pasteurization, 20% (mg/100 mL) enriched juice was subjected to this process. Based on obtained data of bioactivity and sensorial analysis, C. × clementina by-products could be proposed as a promising source of bioactive compounds useful for the formulation of a functional drink for preventing diseases associated with oxidative stress such as type 2 diabetes and obesity.
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11
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Munakata R, Kitajima S, Nuttens A, Tatsumi K, Takemura T, Ichino T, Galati G, Vautrin S, Bergès H, Grosjean J, Bourgaud F, Sugiyama A, Hehn A, Yazaki K. Convergent evolution of the UbiA prenyltransferase family underlies the independent acquisition of furanocoumarins in plants. THE NEW PHYTOLOGIST 2020; 225:2166-2182. [PMID: 31642055 PMCID: PMC7028039 DOI: 10.1111/nph.16277] [Citation(s) in RCA: 20] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/21/2019] [Accepted: 10/09/2019] [Indexed: 05/03/2023]
Abstract
Furanocoumarins (FCs) are plant-specialized metabolites with potent allelochemical properties. The distribution of FCs is scattered with a chemotaxonomical tendency towards four distant families with highly similar FC pathways. The mechanism by which this pathway emerged and spread in plants has not been elucidated. Furanocoumarin biosynthesis was investigated in Ficus carica (fig, Moraceae), focusing on the first committed reaction catalysed by an umbelliferone dimethylallyltransferase (UDT). Comparative RNA-seq analysis among latexes of different fig organs led to the identification of a UDT. The phylogenetic relationship of this UDT to previously reported Apiaceae UDTs was evaluated. The expression pattern of F. carica prenyltransferase 1 (FcPT1) was related to the FC contents in different latexes. Enzymatic characterization demonstrated that one of the main functions of FcPT1 is UDT activity. Phylogenetic analysis suggested that FcPT1 and Apiaceae UDTs are derived from distinct ancestors, although they both belong to the UbiA superfamily. These findings are supported by significant differences in the related gene structures. This report describes the identification of FcPT1 involved in FC biosynthesis in fig and provides new insights into multiple origins of the FC pathway and, more broadly, into the adaptation of plants to their environments.
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Affiliation(s)
- Ryosuke Munakata
- Laboratory of Plant Gene ExpressionResearch Institute for Sustainable HumanosphereKyoto UniversityUjiKyoto611‐0011Japan
- Université de LorraineINRA, LAEF54000NancyFrance
| | - Sakihito Kitajima
- Department of Applied BiologyKyoto Institute of TechnologyMatsugasaki Sakyo‐kuKyoto606‐8585Japan
- The Center for Advanced Insect Research PromotionKyoto Institute of TechnologyMatsugasaki Sakyo‐kuKyoto606‐8585Japan
| | | | - Kanade Tatsumi
- Laboratory of Plant Gene ExpressionResearch Institute for Sustainable HumanosphereKyoto UniversityUjiKyoto611‐0011Japan
| | - Tomoya Takemura
- Laboratory of Plant Gene ExpressionResearch Institute for Sustainable HumanosphereKyoto UniversityUjiKyoto611‐0011Japan
| | - Takuji Ichino
- Laboratory of Plant Gene ExpressionResearch Institute for Sustainable HumanosphereKyoto UniversityUjiKyoto611‐0011Japan
| | | | - Sonia Vautrin
- Centre National de Ressources Genomiques Vegetales – INRA24 Chemin de Borde RougeAuzeville CS 5262731326Castanet Tolosan CedexFrance
| | - Hélène Bergès
- Centre National de Ressources Genomiques Vegetales – INRA24 Chemin de Borde RougeAuzeville CS 5262731326Castanet Tolosan CedexFrance
| | | | - Frédéric Bourgaud
- Plant Advanced Technologies – PAT19 Avenue de la forêt de Haye54500VandoeuvreFrance
| | - Akifumi Sugiyama
- Laboratory of Plant Gene ExpressionResearch Institute for Sustainable HumanosphereKyoto UniversityUjiKyoto611‐0011Japan
| | - Alain Hehn
- Université de LorraineINRA, LAEF54000NancyFrance
| | - Kazufumi Yazaki
- Laboratory of Plant Gene ExpressionResearch Institute for Sustainable HumanosphereKyoto UniversityUjiKyoto611‐0011Japan
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12
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Wright WC, Chenge J, Chen T. Structural Perspectives of the CYP3A Family and Their Small Molecule Modulators in Drug Metabolism. LIVER RESEARCH 2019; 3:132-142. [PMID: 32789028 PMCID: PMC7418881 DOI: 10.1016/j.livres.2019.08.001] [Citation(s) in RCA: 24] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
Abstract
Cytochrome P450 enzymes function to catalyze a wide range of reactions, many of which are critically important for drug response. Members of the human cytochrome P450 3A (CYP3A) family are particularly important in drug clearance, and they collectively metabolize more than half of all currently prescribed medications. The ability of these enzymes to bind a large and structurally diverse set of compounds increases the chances of their modulating or facilitating drug metabolism in unfavorable ways. Emerging evidence suggests that individual enzymes in the CYP3A family play discrete and important roles in catalysis and disease progression. Here we review the similarities and differences among CYP3A enzymes with regard to substrate recognition, metabolism, modulation by small molecules, and biological consequence, highlighting some of those with clinical significance. We also present structural perspectives to further characterize the basis of these comparisons.
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Affiliation(s)
- William C. Wright
- Department of Chemical Biology and Therapeutics, St. Jude Children’s Research Hospital, Memphis, Tennessee 38105, USA
- Integrated Biomedical Sciences Program, University of Tennessee Health Science Center, Memphis, Tennessee 38163, USA
| | - Jude Chenge
- Integrated Biomedical Sciences Program, University of Tennessee Health Science Center, Memphis, Tennessee 38163, USA
| | - Taosheng Chen
- Department of Chemical Biology and Therapeutics, St. Jude Children’s Research Hospital, Memphis, Tennessee 38105, USA
- Integrated Biomedical Sciences Program, University of Tennessee Health Science Center, Memphis, Tennessee 38163, USA
- Corresponding author: Taosheng Chen, Department of Chemical Biology and Therapeutics, MS 1000, St. Jude Children’s Research Hospital, 262 Danny Thomas Place, Memphis, TN 38105, USA. Tel: (901) 595-5937; Fax: (901) 595-5715;
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13
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Structural Insights into the Interaction of Cytochrome P450 3A4 with Suicide Substrates: Mibefradil, Azamulin and 6',7'-Dihydroxybergamottin. Int J Mol Sci 2019; 20:ijms20174245. [PMID: 31480231 PMCID: PMC6747129 DOI: 10.3390/ijms20174245] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/09/2019] [Revised: 08/28/2019] [Accepted: 08/29/2019] [Indexed: 11/22/2022] Open
Abstract
Human cytochrome P450 3A4 (CYP3A4) is the most important drug-metabolizing enzyme. Some drugs and natural compounds can act as suicide (mechanism-based) inactivators of CYP3A4, leading to unanticipated drug-drug interactions, toxicity and therapeutic failures. Despite significant clinical and toxicological implications, the mechanism-based inactivation remains incompletely understood. This study provides the first direct insights into the interaction of CYP3A4 with three suicide substrates: mibefradil, an antihypertensive drug quickly withdrawn from the market; a semi-synthetic antibiotic azamulin; and a natural furanocoumarin, 6′,7′-dihydroxybergamottin. Novel structural findings help better understand the suicide substrate binding and inhibitory mechanism, and can be used to improve the predictability of the binding ability, metabolic sites and inhibitory/inactivation potential of newly developed drugs and other chemicals relevant to public health.
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Wen B, Gorycki P. Bioactivation of herbal constituents: mechanisms and toxicological relevance. Drug Metab Rev 2019; 51:453-497. [DOI: 10.1080/03602532.2019.1655570] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
Affiliation(s)
- Bo Wen
- Department of Drug Metabolism and Pharmacokinetics, GlaxoSmithKline, Collegeville, PA, USA
| | - Peter Gorycki
- Department of Drug Metabolism and Pharmacokinetics, GlaxoSmithKline, Collegeville, PA, USA
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Matlock MK, Tambe A, Elliott-Higgins J, Hines RN, Miller GP, Swamidass SJ. A Time-Embedding Network Models the Ontogeny of 23 Hepatic Drug Metabolizing Enzymes. Chem Res Toxicol 2019; 32:1707-1721. [PMID: 31304741 DOI: 10.1021/acs.chemrestox.9b00223] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/26/2022]
Abstract
Pediatric patients are at elevated risk of adverse drug reactions, and there is insufficient information on drug safety in children. Complicating risk assessment in children, there are numerous age-dependent changes in the absorption, distribution, metabolism, and elimination of drugs. A key contributor to age-dependent drug toxicity risk is the ontogeny of drug metabolism enzymes, the changes in both abundance and type throughout development from the fetal period through adulthood. Critically, these changes affect not only the overall clearance of drugs but also exposure to individual metabolites. In this study, we introduce time-embedding neural networks in order to model population-level variation in metabolism enzyme expression as a function of age. We use a time-embedding network to model the ontogeny of 23 drug metabolism enzymes. The time-embedding network recapitulates known demographic factors impacting 3A5 expression. The time-embedding network also effectively models the nonlinear dynamics of 2D6 expression, enabling a better fit to clinical data than prior work. In contrast, a standard neural network fails to model these features of 3A5 and 2D6 expression. Finally, we combine the time-embedding model of ontogeny with additional information to estimate age-dependent changes in reactive metabolite exposure. This simple approach identifies age-dependent changes in exposure to valproic acid and dextromethorphan metabolites and suggests potential mechanisms of valproic acid toxicity. This approach may help researchers evaluate the risk of drug toxicity in pediatric populations.
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Affiliation(s)
- Matthew K Matlock
- Department of Pathology and Immunology , Washington University in St. Louis , Saint Louis , Missouri 63110 , United States
| | - Abhik Tambe
- Department of Pathology and Immunology , Washington University in St. Louis , Saint Louis , Missouri 63110 , United States
| | - Jack Elliott-Higgins
- Department of Pathology and Immunology , Washington University in St. Louis , Saint Louis , Missouri 63110 , United States
| | - Ronald N Hines
- National Health and Environmental Effects Research Laboratory , United States Environmental Protection Agency , Research Triangle Park , North Carolina 27709 , United States
| | - Grover P Miller
- Department of Biochemistry and Molecular Biology , University of Arkansas for Medical Sciences , Little Rock , Arkansas 72205 , United States
| | - S Joshua Swamidass
- Institute for Informatics , Washington University in St. Louis , Saint Louis , Missouri 63110 , United States
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An important mechanism of herb-induced hepatotoxicity: To produce RMs based on active functional groups-containing ingredients from phytomedicine by binding CYP450s. CHINESE HERBAL MEDICINES 2019. [DOI: 10.1016/j.chmed.2019.07.001] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/02/2023] Open
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17
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Sakaki T, Yasuda K, Nishikawa M, Ikushiro S. [Metabolism of Sesamin and Drug-Sesamin Interaction]. YAKUGAKU ZASSHI 2018; 138:357-363. [PMID: 29503429 DOI: 10.1248/yakushi.17-00191-4] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
Sesamin, derived from sesame seeds, is known to have various biological effects. Since some of these effects appear to be derived from its metabolites, the elucidation of sesamin metabolism is essential to understanding the molecular mechanism of its effects. In addition, it is important to clarify drug-sesamin interactions in order to address safety concerns, as some food factors are known to affect drug metabolism. Our previous studies revealed that sesamin was sequentially metabolized by cytochrome P450 (CYP) and UDP-glucuronosyltransferase or sulfotransferase. Whereas sesamin metabolism is mainly mediated by CYP2C9 in human liver, sesamin causes a mechanism-based inhibition (MBI) of CYP2C9. However, we found that the metabolite-intermediate complex between CYP2C9 and sesamin was unstable, and the effects of sesamin appeared to be minimal. To confirm this assumption, in vivo studies using rats were conducted. After the administration of sesamin to rats for 3 d, diclofenac (an NSAID) was administered to measure the time course of plasma concentration of diclofenac. No significant differences were observed in the diclofenac Cmax, Tmax, and AUC0-24 h between the group that was administered sesamin and the group that was not. Based on these results, it could be concluded that no significant interaction occurs in people who take sesamin supplements at a standard dose.
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Affiliation(s)
- Toshiyuki Sakaki
- Department of Pharmaceutical Engineering, Faculty of Engineering, Toyama Prefectural University
| | - Kaori Yasuda
- Department of Pharmaceutical Engineering, Faculty of Engineering, Toyama Prefectural University
| | - Miyu Nishikawa
- Department of Pharmaceutical Engineering, Faculty of Engineering, Toyama Prefectural University
| | - Shinichi Ikushiro
- Department of Biotechnology, Faculty of Engineering, Toyama Prefectural University
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Coordination Mechanism and Bio-Evidence: Reactive γ-Ketoenal Intermediated Hepatotoxicity of Psoralen and Isopsoralen Based on Computer Approach and Bioassay. Molecules 2017; 22:molecules22091451. [PMID: 32962321 PMCID: PMC6151710 DOI: 10.3390/molecules22091451] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/30/2017] [Revised: 08/23/2017] [Accepted: 08/29/2017] [Indexed: 11/30/2022] Open
Abstract
Psoralen and isopsoralen are secondary plant metabolites found in many fruits, vegetables, and medicinal herbs. Psoralen-containing plants (Psoralea corylifolia L.) have been reported to cause hepatotoxicity. Herein, we found that psoralen and isopsoralen were oxidized by CYP450s to reactive furanoepoxide or γ-ketoenal intermediates, causing a mechanism-based inhibition of CYP3A4. Furthermore, in GSH-depleted mice, the hepatotoxicity of these reactive metabolites has been demonstrated by pre-treatment with a well-known GSH synthesis inhibitor, L-buthionine-S, Rsulfoxinine (BSO). Moreover, a molecular docking simulation of the present study was undertaken to understand the coordination reaction that plays a significant role in the combination of unstable intermediates and CYP3A4. These results suggested that psoralen and isopsoralen are modest hepatotoxic agents, as their reactive metabolites could be deactivated by H2O and GSH in the liver, which partly contributes to the ingestion of psoralen-containing fruits and vegetables being safe.
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Venkatachalam A, Parashar A, Manoj KM. Functioning of drug-metabolizing microsomal cytochrome P450s: In silico probing of proteins suggests that the distal heme 'active site' pocket plays a relatively 'passive role' in some enzyme-substrate interactions. In Silico Pharmacol 2016; 4:2. [PMID: 26894412 PMCID: PMC4760962 DOI: 10.1186/s40203-016-0016-7] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/07/2015] [Accepted: 02/05/2016] [Indexed: 01/01/2023] Open
Abstract
PURPOSE The currently held mechanistic understanding of microsomal cytochrome P450s (CYPs) seeks that diverse drug molecules bind within the deep-seated distal heme pocket and subsequently react at the heme centre. To explain a bevy of experimental observations and meta-analyses, we indulge a hypothesis that involves a "diffusible radical mediated" mechanism. This new hypothesis posits that many substrates could also bind at alternate loci on/within the enzyme and be reacted without the pertinent moiety accessing a bonding proximity to the purported catalytic Fe-O enzyme intermediate. METHODS Through blind and heme-distal pocket centered dockings of various substrates and non-substrates (drug molecules of diverse sizes, classes, topographies etc.) of microsomal CYPs, we explored the possibility of access of substrates via the distal channels, its binding energies, docking orientations, distance of reactive moieties (or molecule per se) to/from the heme centre, etc. We investigated specific cases like- (a) large drug molecules as substrates, (b) classical marker drug substrates, (c) class of drugs as substrates (Sartans, Statins etc.), (d) substrate preferences between related and unrelated CYPs, (e) man-made site-directed mutants' and naturally occurring mutants' reactivity and metabolic disposition, (f) drug-drug interactions, (g) overall affinities of drug substrate versus oxidized product, (h) meta-analysis of in silico versus experimental binding constants and reaction/residence times etc. RESULTS It was found that heme-centered dockings of the substrate/modulator drug molecules with the available CYP crystal structures gave poor docking geometries and distances from Fe-heme centre. In conjunction with several other arguments, the findings discount the relevance of erstwhile hypothesis in many CYP systems. Consequently, the newly proposed hypothesis is deemed a viable alternate, as it satisfies Occam's razor. CONCLUSIONS The new proposal affords expanded scope for explaining the mechanism, kinetics and overall phenomenology of CYP mediated drug metabolism. It is now understood that the heme-iron and the hydrophobic distal pocket of CYPs serve primarily to stabilize the reactive intermediate (diffusible radical) and the surface or crypts of the apoprotein bind to the xenobiotic substrate (and in some cases, the heme distal pocket could also serve the latter function). Thus, CYPs enhance reaction rates and selectivity/specificity via a hitherto unrecognized modality.
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Affiliation(s)
- Avanthika Venkatachalam
- Formerly at PSG Institute of Advanced Studies, Avinashi Road, Peelamedu, Coimbatore, Tamil Nadu, 641004, India.
| | - Abhinav Parashar
- Formerly at Hemoproteins Lab, School of Bio Sciences and Technology, VIT University, Vellore, Tamil Nadu, India, 632014.
| | - Kelath Murali Manoj
- Formerly at PSG Institute of Advanced Studies, Avinashi Road, Peelamedu, Coimbatore, Tamil Nadu, 641004, India.
- Formerly at Hemoproteins Lab, School of Bio Sciences and Technology, VIT University, Vellore, Tamil Nadu, India, 632014.
- Satyamjayatu: The Science & Ethics Foundation, Kulappully, Shoranur-2 (PO), Kerala, 679122, India.
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Tailor A, Waddington JC, Meng X, Park BK. Mass Spectrometric and Functional Aspects of Drug–Protein Conjugation. Chem Res Toxicol 2016; 29:1912-1935. [DOI: 10.1021/acs.chemrestox.6b00147] [Citation(s) in RCA: 33] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
Affiliation(s)
- Arun Tailor
- MRC Center
for Drug Safety
Science, Department of Molecular and Clinical Pharmacology, University of Liverpool, Sherrington Building, Ashton Street, Liverpool L69 3GE, United Kingdom
| | - James C. Waddington
- MRC Center
for Drug Safety
Science, Department of Molecular and Clinical Pharmacology, University of Liverpool, Sherrington Building, Ashton Street, Liverpool L69 3GE, United Kingdom
| | - Xiaoli Meng
- MRC Center
for Drug Safety
Science, Department of Molecular and Clinical Pharmacology, University of Liverpool, Sherrington Building, Ashton Street, Liverpool L69 3GE, United Kingdom
| | - B. Kevin Park
- MRC Center
for Drug Safety
Science, Department of Molecular and Clinical Pharmacology, University of Liverpool, Sherrington Building, Ashton Street, Liverpool L69 3GE, United Kingdom
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21
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Haarhoff ZE, Kramer MA, Zvyaga TA, Zhang J, Bhutani P, Subramanian M, Rodrigues AD. Comprehensive evaluation of liver microsomal cytochrome P450 3A (CYP3A) inhibition: comparison of cynomolgus monkey and human. Xenobiotica 2016; 47:470-478. [DOI: 10.1080/00498254.2016.1203042] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
Affiliation(s)
| | | | | | - Jun Zhang
- Bristol-Myers Squibb, Wallingford, CT, USA,
| | - Priyadeep Bhutani
- Biocon Bristol-Myers Squibb Research and Development Center, Syngene International Limited, Bangalore, Karnataka, India
| | - Murali Subramanian
- Biocon Bristol-Myers Squibb Research and Development Center, Syngene International Limited, Bangalore, Karnataka, India
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22
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Dugrand-Judek A, Olry A, Hehn A, Costantino G, Ollitrault P, Froelicher Y, Bourgaud F. The Distribution of Coumarins and Furanocoumarins in Citrus Species Closely Matches Citrus Phylogeny and Reflects the Organization of Biosynthetic Pathways. PLoS One 2015; 10:e0142757. [PMID: 26558757 PMCID: PMC4641707 DOI: 10.1371/journal.pone.0142757] [Citation(s) in RCA: 79] [Impact Index Per Article: 8.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/21/2015] [Accepted: 10/23/2015] [Indexed: 11/18/2022] Open
Abstract
Citrus plants are able to produce defense compounds such as coumarins and furanocoumarins to cope with herbivorous insects and pathogens. In humans, these chemical compounds are strong photosensitizers and can interact with medications, leading to the "grapefruit juice effect". Removing coumarins and furanocoumarins from food and cosmetics imply additional costs and might alter product quality. Thus, the selection of Citrus cultivars displaying low coumarin and furanocoumarin contents constitutes a valuable alternative. In this study, we performed ultra-performance liquid chromatography coupled with mass spectrometry analyses to determine the contents of these compounds within the peel and the pulp of 61 Citrus species representative of the genetic diversity all Citrus. Generally, Citrus peel contains larger diversity and higher concentrations of coumarin/furanocoumarin than the pulp of the same fruits. According to the chemotypes found in the peel, Citrus species can be separated into 4 groups that correspond to the 4 ancestral taxa (pummelos, mandarins, citrons and papedas) and extended with their respective secondary species descendants. Three of the 4 ancestral taxa (pummelos, citrons and papedas) synthesize high amounts of these compounds, whereas mandarins appear practically devoid of them. Additionally, all ancestral taxa and their hybrids are logically organized according to the coumarin and furanocoumarin pathways described in the literature. This organization allows hypotheses to be drawn regarding the biosynthetic origin of compounds for which the biogenesis remains unresolved. Determining coumarin and furanocoumarin contents is also helpful for hypothesizing the origin of Citrus species for which the phylogeny is presently not firmly established. Finally, this work also notes favorable hybridization schemes that will lead to low coumarin and furanocoumarin contents, and we propose to select mandarins and Ichang papeda as Citrus varieties for use in creating species devoid of these toxic compounds in future breeding programs.
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Affiliation(s)
- Audray Dugrand-Judek
- Université de Lorraine, UMR 1121 Laboratoire Agronomie et Environnement Nancy-Colmar, 2 avenue de la forêt de Haye, TSA 40602, 54518, Vandœuvre-lès-Nancy, France
- INRA, UMR 1121 Université de Lorraine, UMR 1121 Laboratoire Agronomie et Environnement Nancy-Colmar, 2 avenue de la forêt de Haye, TSA 40602, 54518, Vandœuvre-lès-Nancy, France
| | - Alexandre Olry
- Université de Lorraine, UMR 1121 Laboratoire Agronomie et Environnement Nancy-Colmar, 2 avenue de la forêt de Haye, TSA 40602, 54518, Vandœuvre-lès-Nancy, France
- INRA, UMR 1121 Université de Lorraine, UMR 1121 Laboratoire Agronomie et Environnement Nancy-Colmar, 2 avenue de la forêt de Haye, TSA 40602, 54518, Vandœuvre-lès-Nancy, France
| | - Alain Hehn
- Université de Lorraine, UMR 1121 Laboratoire Agronomie et Environnement Nancy-Colmar, 2 avenue de la forêt de Haye, TSA 40602, 54518, Vandœuvre-lès-Nancy, France
- INRA, UMR 1121 Université de Lorraine, UMR 1121 Laboratoire Agronomie et Environnement Nancy-Colmar, 2 avenue de la forêt de Haye, TSA 40602, 54518, Vandœuvre-lès-Nancy, France
| | | | - Patrick Ollitrault
- Centro de Protección Vegetal y Biotecnología, Instituto Valenciano de Investigaciones Agrarias (Ivia), 46113 Moncada, Valencia, Spain
- CIRAD, UMR AGAP, Station de Roujol, 97170 Petit-Bourg, Guadeloupe, France
| | - Yann Froelicher
- CIRAD, UMR AGAP, Station INRA, F-20230, San Giuliano, France
| | - Frédéric Bourgaud
- Université de Lorraine, UMR 1121 Laboratoire Agronomie et Environnement Nancy-Colmar, 2 avenue de la forêt de Haye, TSA 40602, 54518, Vandœuvre-lès-Nancy, France
- INRA, UMR 1121 Université de Lorraine, UMR 1121 Laboratoire Agronomie et Environnement Nancy-Colmar, 2 avenue de la forêt de Haye, TSA 40602, 54518, Vandœuvre-lès-Nancy, France
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Lu D, Ji L, Zheng L, Cao J, Peng Y, Zheng J. Mechanism-based inactivation of cytochrome P450 2B6 by isopsoralen. Xenobiotica 2015; 46:335-41. [PMID: 26338349 DOI: 10.3109/00498254.2015.1077403] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
Abstract
1. Isopsoralen (IPRN) is a major component in many traditional medicinal herbs widely used in Asian countries. The objective of the present study was to investigate the inhibitory effect of IPRN on cytochrome P450 2B6 (CYP2B6) and the mechanism involved in the enzyme inactivation. 2. Pre-incubation of CYP2B6 with IPRN resulted in a time- and concentration-dependent enzyme activity loss. The values of K(I) and k(inact) were found to be 7.89 μM and 0.067 min(-1), respectively. Ticlopidine exhibited protective effect on the IPRN-induced enzyme inactivation. The estimated partition ratio of the inactivation was 122. The GSH trapping experiments indicate that an epoxide and/or γ-ketoenal intermediate were/was generated in IPRN-fortified microsomal incubations. The synthetic work verified the formation of the reactive intermediate(s). Additionally, CYPs2E1, 2C19, 2B6 and 1A2 were found to be the major enzymes participating in the bioactivation of IPRN. 3. IPRN was characterized as a mechanism-based inactivator of CYP2B6. An IPRN-derived furanoepoxide and/or γ-ketoenal intermediate(s) were/was generated and may be responsible for the inactivation of CYP2B6.
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Affiliation(s)
| | | | | | | | | | - Jiang Zheng
- b Key Laboratory of Structure-Based Drug Design & Discovery of Ministry of Education , Shenyang , Liaoning , P. R. China and.,c Division of Gastroenterology and Hepatology, Department of Pediatrics , Center for Developmental Therapeutics, Seattle Children's Research Institute, University of Washington School of Medicine , Seattle , WA , USA
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Liu J, Pham PT, Skripnikova EV, Zheng S, Lovings LJ, Wang Y, Goyal N, Bellow SM, Mensah LM, Chatters AJ, Bratton MR, Wiese TE, Zhao M, Wang G, Foroozesh M. A Ligand-Based Drug Design. Discovery of 4-Trifluoromethyl-7,8-pyranocoumarin as a Selective Inhibitor of Human Cytochrome P450 1A2. J Med Chem 2015. [PMID: 26222195 DOI: 10.1021/acs.jmedchem.5b00494] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
Abstract
In humans, cytochrome P450 1A2 is the major enzyme metabolizing environmental arylamines or heterocyclic amines into carcinogens. Since evidence shows that planar triangle-shaped molecules are capable of selectively inhibiting P450 1A2, 16 triangular flavone, and coumarin derivatives were designed and synthesized for these studies. Among these compounds, 7,8-furanoflavone time-dependently inhibits P450 1A2 with a K(I) value of 0.44 μM. With a 5 min preincubation in the presence of NADPH, 0.01 μM 7,8-furanoflavone completely inactivates P450 1A2 but does not influence the activities of P450s 1A1 and 1B1. Another target compound, 7,8-pyrano-4-trifluoromethylcoumarin, is found to be a competitive inhibitor, showing high selectivity for the inhibition of P450 1A2 with a K(i) of 0.39 μM, 155- and 52-fold lower than its K(i) values against P450s 1A1 and 1B1, respectively. In yeast AhR activation assays, 7,8-pyrano-4-trifluoromethylcoumarin does not activate aryl hydrocarbon receptor when the concentration is lower than 1 μM, suggesting that this compound would not up-regulate AhR-caused P450 enzyme expression. In-cell P450 1A2 inhibition assays show that 7,8-pyrano-4-trifluoromethylcoumarin decreases the MROD activity in HepG2 cells at concentrations higher than 1 μM. Thus, using 7,8-pyrano-4-trifluoromethylcoumarin, a selective and specific P450 1A2 action suppression could be achieved, indicating the potential for the development of P450 1A2-targeting cancer preventive agents.
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Affiliation(s)
- Jiawang Liu
- Department of Chemistry, Xavier University of Louisiana , 1 Drexel Drive, New Orleans, Louisiana 70125, United States
| | - Peter T Pham
- Department of Chemistry, Xavier University of Louisiana , 1 Drexel Drive, New Orleans, Louisiana 70125, United States
| | - Elena V Skripnikova
- Cell and Molecular Biology Core, College of Pharmacy, Xavier University of Louisiana , New Orleans, Louisiana 70125, United States
| | - Shilong Zheng
- Department of Chemistry, Xavier University of Louisiana , 1 Drexel Drive, New Orleans, Louisiana 70125, United States.,RCMI Cancer Research Center, Xavier University of Louisiana , 1 Drexel Drive, New Orleans, Louisiana 70125, United States
| | - La'nese J Lovings
- Department of Chemistry, Xavier University of Louisiana , 1 Drexel Drive, New Orleans, Louisiana 70125, United States
| | - Yuji Wang
- College of Pharmaceutical Sciences, Capital Medical University , Beijing 100069, P. R. China
| | - Navneet Goyal
- Department of Chemistry, Xavier University of Louisiana , 1 Drexel Drive, New Orleans, Louisiana 70125, United States
| | - Sydni M Bellow
- Department of Chemistry, Xavier University of Louisiana , 1 Drexel Drive, New Orleans, Louisiana 70125, United States
| | - Lydia M Mensah
- Department of Chemistry, Xavier University of Louisiana , 1 Drexel Drive, New Orleans, Louisiana 70125, United States
| | - Amari J Chatters
- Department of Chemistry, Xavier University of Louisiana , 1 Drexel Drive, New Orleans, Louisiana 70125, United States
| | - Melyssa R Bratton
- Cell and Molecular Biology Core, College of Pharmacy, Xavier University of Louisiana , New Orleans, Louisiana 70125, United States
| | - Thomas E Wiese
- Cell and Molecular Biology Core, College of Pharmacy, Xavier University of Louisiana , New Orleans, Louisiana 70125, United States
| | - Ming Zhao
- College of Pharmaceutical Sciences, Capital Medical University , Beijing 100069, P. R. China.,Faculty of Biomedical Science and Environmental Biology, Kaohsiung Medical University , Kaohsiung 807, Taiwan
| | - Guangdi Wang
- Department of Chemistry, Xavier University of Louisiana , 1 Drexel Drive, New Orleans, Louisiana 70125, United States.,RCMI Cancer Research Center, Xavier University of Louisiana , 1 Drexel Drive, New Orleans, Louisiana 70125, United States
| | - Maryam Foroozesh
- Department of Chemistry, Xavier University of Louisiana , 1 Drexel Drive, New Orleans, Louisiana 70125, United States
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25
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Yu H, Balani SK, Chen W, Cui D, He L, Humphreys WG, Mao J, Lai WG, Lee AJ, Lim HK, MacLauchlin C, Prakash C, Surapaneni S, Tse S, Upthagrove A, Walsky RL, Wen B, Zeng Z. Contribution of Metabolites to P450 Inhibition–Based Drug–Drug Interactions: Scholarship from the Drug Metabolism Leadership Group of the Innovation and Quality Consortium Metabolite Group. Drug Metab Dispos 2015; 43:620-30. [DOI: 10.1124/dmd.114.059345] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/03/2023] Open
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26
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Ho HK, Chan JCY, Hardy KD, Chan ECY. Mechanism-based inactivation of CYP450 enzymes: a case study of lapatinib. Drug Metab Rev 2015; 47:21-8. [PMID: 25639891 DOI: 10.3109/03602532.2014.1003648] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
Abstract
Mechanism-based inactivation (MBI) of CYP450 enzymes is a unique form of inhibition in which the enzymatic machinery of the victim is responsible for generation of the reactive metabolite. This precondition sets up a time-dependency for the inactivation process, a hallmark feature that characterizes all MBI. Yet, MBI itself is a complex biochemical phenomenon that operates in different modes, namely, covalent binding to apoprotein, covalent binding of the porphyrin group and also complexation of the catalytic iron. Using lapatinib as a recent example of toxicological interest, we present an example of a mixed-function MBI that can confound clinical drug-drug interactions manifestation. Lapatinib exhibits both covalent binding to the apoprotein and formation of a metabolite-intermediate complex in an enzyme-selective manner (CYP3A4 versus CYP3A5), each with different reactive metabolites. The clinical implication of this effect is also contingent upon genetic polymorphisms of the enzyme involved as well as the co-administration of other substrates, inhibitors or inducers, culminating in drug-drug interactions. This understanding recapitulates the importance of applying isoform-specific mechanistic investigations to develop customized strategies to manage such outcomes.
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Affiliation(s)
- Han Kiat Ho
- Department of Pharmacy, Faculty of Science, National University of Singapore , Singapore and
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Bolles AK, Fujiwara R, Briggs ED, Nomeir AA, Furge LL. Mechanism-based inactivation of human cytochrome P450 3A4 by two piperazine-containing compounds. Drug Metab Dispos 2014; 42:2087-96. [PMID: 25273356 DOI: 10.1124/dmd.114.060459] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022] Open
Abstract
Human cytochrome P450 3A4 (CYP3A4) is responsible for the metabolism of more than half of pharmaceutic drugs, and inactivation of CYP3A4 can lead to adverse drug-drug interactions. The substituted imidazole compounds 5-fluoro-2-[4-[(2-phenyl-1H-imidazol-5-yl)methyl]-1-piperazinyl]pyrimidine (SCH 66712) and 1-[(2-ethyl-4-methyl-1H-imidazol-5-yl)methyl]-4-[4-(trifluoromethyl)-2-pyridinyl]piperazine (EMTPP) have been previously identified as mechanism-based inactivators (MBI) of CYP2D6. The present study shows that both SCH 66712 and EMTPP are also MBIs of CYP3A4. Inhibition of CYP3A4 by SCH 66712 and EMTPP was determined to be concentration, time, and NADPH dependent. In addition, inactivation of CYP3A4 by SCH 66712 was shown to be unaffected by the presence of electrophile scavengers. SCH 66712 displays type I binding to CYP3A4 with a spectral binding constant (Ks) of 42.9 ± 2.9 µM. The partition ratios for SCH 66712 and EMTPP were 11 and 94, respectively. Whole protein mass spectrum analysis revealed 1:1 binding stoichiometry of SCH 66712 and EMTPP to CYP3A4 and a mass increase consistent with adduction by the inactivators without addition of oxygen. Heme adduction was not apparent. Multiple mono-oxygenation products with each inactivator were observed; no other products were apparent. These are the first MBIs to be shown to be potent inactivators of both CYP2D6 and CYP3A4.
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Affiliation(s)
- Amanda K Bolles
- Amin Nomeir Pharmaceutical Consulting, LLC, Milford, New Jersey (A.A.N.); and Department of Chemistry, Kalamazoo College, Kalamazoo, Michigan (A.K.B., R.F., E.D.B., L.L.F.)
| | - Rina Fujiwara
- Amin Nomeir Pharmaceutical Consulting, LLC, Milford, New Jersey (A.A.N.); and Department of Chemistry, Kalamazoo College, Kalamazoo, Michigan (A.K.B., R.F., E.D.B., L.L.F.)
| | - Erran D Briggs
- Amin Nomeir Pharmaceutical Consulting, LLC, Milford, New Jersey (A.A.N.); and Department of Chemistry, Kalamazoo College, Kalamazoo, Michigan (A.K.B., R.F., E.D.B., L.L.F.)
| | - Amin A Nomeir
- Amin Nomeir Pharmaceutical Consulting, LLC, Milford, New Jersey (A.A.N.); and Department of Chemistry, Kalamazoo College, Kalamazoo, Michigan (A.K.B., R.F., E.D.B., L.L.F.)
| | - Laura Lowe Furge
- Amin Nomeir Pharmaceutical Consulting, LLC, Milford, New Jersey (A.A.N.); and Department of Chemistry, Kalamazoo College, Kalamazoo, Michigan (A.K.B., R.F., E.D.B., L.L.F.)
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Thorsell A, Isin EM, Jurva U. Use of Electrochemical Oxidation and Model Peptides To Study Nucleophilic Biological Targets of Reactive Metabolites: The Case of Rimonabant. Chem Res Toxicol 2014; 27:1808-20. [DOI: 10.1021/tx500255r] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Affiliation(s)
- Annika Thorsell
- DMPK Design and Biotransformation, CVMD iMed DMPK, AstraZeneca R&D Mölndal, Sweden, Pepparedsleden 1, SE-431 83, Mölndal, Sweden
| | - Emre M. Isin
- DMPK Design and Biotransformation, CVMD iMed DMPK, AstraZeneca R&D Mölndal, Sweden, Pepparedsleden 1, SE-431 83, Mölndal, Sweden
| | - Ulrik Jurva
- DMPK Design and Biotransformation, CVMD iMed DMPK, AstraZeneca R&D Mölndal, Sweden, Pepparedsleden 1, SE-431 83, Mölndal, Sweden
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Yang Y, Xiao Q, Humphreys WG, Dongre A, Shu YZ. Identification of Human Liver Microsomal Proteins Adducted by a Reactive Metabolite Using Shotgun Proteomics. Chem Res Toxicol 2014; 27:1537-46. [DOI: 10.1021/tx500181p] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/04/2023]
Affiliation(s)
- Yanou Yang
- Bristol-Myers Squibb Research and Development, 311 Pennington-Rocky Hill Road, Pennington, New Jersey 08534, United States
| | - Qing Xiao
- Bristol-Myers Squibb Research and Development, 311 Pennington-Rocky Hill Road, Pennington, New Jersey 08534, United States
| | - W. Griffith Humphreys
- Bristol-Myers Squibb Research and Development, 311 Pennington-Rocky Hill Road, Pennington, New Jersey 08534, United States
| | - Ashok Dongre
- Bristol-Myers Squibb Research and Development, 311 Pennington-Rocky Hill Road, Pennington, New Jersey 08534, United States
| | - Yue-Zhong Shu
- Bristol-Myers Squibb Research and Development, 311 Pennington-Rocky Hill Road, Pennington, New Jersey 08534, United States
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Koe XF, Tengku Muhammad TS, Chong ASC, Wahab HA, Tan ML. Cytochrome P450 induction properties of food and herbal-derived compounds using a novel multiplex RT-qPCR in vitro assay, a drug-food interaction prediction tool. Food Sci Nutr 2014; 2:500-20. [PMID: 25473508 PMCID: PMC4237480 DOI: 10.1002/fsn3.122] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/18/2014] [Revised: 04/14/2014] [Accepted: 04/15/2014] [Indexed: 12/22/2022] Open
Abstract
A multiplex RT-qPCR was developed to examine CYP1A2, CYP2D6, and CYP3A4 induction properties of compounds from food and herbal sources. The induction of drug metabolizing enzymes is an important pharmacokinetic interaction with unique features in comparison with inhibition of metabolizing enzymes. Cytochrome induction can lead to serious drug-drug or drug-food interactions, especially if the coadministered drug plasma level is critical as it can reduce therapeutic effects and cause complications. Using this optimized multiplex RT-qPCR, cytochrome induction properties of andrographolide, curcumin, lycopene, bergamottin, and resveratrol were determined. Andrographolide, curcumin, and lycopene produced no significant induction effects on CYP1A2, CYP2D6, and CYP3A4. However, bergamottin appeared to be a significant in vitro CYP1A2 inducer starting from 5 to 50 μmol/L with induction ranging from 60 to 100-fold changes. On the other hand, resveratrol is a weak in vitro CYP1A2 inducer. Examining the cytochrome induction properties of food and herbal compounds help complement CYP inhibition studies and provide labeling and safety caution for such products.
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Affiliation(s)
- Xue Fen Koe
- Malaysian Institute of Pharmaceuticals & Nutraceuticals, Ministry of Science, Technology & Innovation (MOSTI) Halaman Bukit Gambir, 11700, Georgetown, Pulau Pinang, Malaysia
| | | | - Alexander Shu-Chien Chong
- Malaysian Institute of Pharmaceuticals & Nutraceuticals, Ministry of Science, Technology & Innovation (MOSTI) Halaman Bukit Gambir, 11700, Georgetown, Pulau Pinang, Malaysia ; The Centre for Chemical Biology, Universiti Sains Malaysia Georgetown, Pulau Pinang, Malaysia
| | - Habibah Abdul Wahab
- Malaysian Institute of Pharmaceuticals & Nutraceuticals, Ministry of Science, Technology & Innovation (MOSTI) Halaman Bukit Gambir, 11700, Georgetown, Pulau Pinang, Malaysia ; School of Pharmaceutical Sciences, Universiti Sains Malaysia Georgetown, Pulau Pinang, Malaysia
| | - Mei Lan Tan
- Malaysian Institute of Pharmaceuticals & Nutraceuticals, Ministry of Science, Technology & Innovation (MOSTI) Halaman Bukit Gambir, 11700, Georgetown, Pulau Pinang, Malaysia ; Advanced Medical & Dental Institute, Universiti Sains Malaysia Georgetown, Pulau Pinang, Malaysia
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Wanwimolruk S, Prachayasittikul V. Cytochrome P450 enzyme mediated herbal drug interactions (Part 1). EXCLI JOURNAL 2014; 13:347-91. [PMID: 26417265 PMCID: PMC4463967] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Subscribe] [Scholar Register] [Received: 07/12/2013] [Accepted: 03/20/2014] [Indexed: 10/29/2022]
Abstract
It is well recognized that herbal supplements or herbal medicines are now commonly used. As many patients taking prescription medications are concomitantly using herbal supplements, there is considerable risk for adverse herbal drug interactions. Such interactions can enhance the risk for an individual patient, especially with regard to drugs with a narrow therapeutic index such as warfarin, cyclosporine A and digoxin. Herbal drug interactions can alter pharmacokinetic or/and pharmacodynamic properties of administered drugs. The most common pharmacokinetic interactions usually involve either the inhibition or induction of the metabolism of drugs catalyzed by the important enzymes, cytochrome P450 (CYP). The aim of the present article is to provide an updated review of clinically relevant metabolic CYP-mediated drug interactions between selected herbal supplements and prescription drugs. The commonly used herbal supplements selected include Echinacea, Ginkgo biloba, garlic, St. John's wort, goldenseal, and milk thistle. To date, several significant herbal drug interactions have their origins in the alteration of CYP enzyme activity by various phytochemicals. Numerous herbal drug interactions have been reported. Although the significance of many interactions is uncertain but several interactions, especially those with St. John's wort, may have critical clinical consequences. St. John's wort is a source of hyperforin, an active ingredient that has a strong affinity for the pregnane xenobiotic receptor (PXR). As a PXR ligand, hyperforin promotes expression of CYP3A4 enzymes in the small intestine and liver. This in turn causes induction of CYP3A4 and can reduce the oral bioavailability of many drugs making them less effective. The available evidence indicates that, at commonly recommended doses, other selected herbs including Echinacea, Ginkgo biloba, garlic, goldenseal and milk thistle do not act as potent or moderate inhibitors or inducers of CYP enzymes. A good knowledge of the mechanisms of herbal drug interactions is necessary for assessing and minimizing clinical risks. These processes help prediction of interactions between herbal supplements and prescription drugs. Healthcare professionals should remain vigilant for potential interactions between herbal supplements/medicines and prescription drugs, especially for drugs with a narrow therapeutic index are used.
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Affiliation(s)
- Sompon Wanwimolruk
- Center for Innovation Development and Technology Transfer, Faculty of Medical Technology, Mahidol University, Bangkok 10700, Thailand,*To whom correspondence should be addressed: Sompon Wanwimolruk, Center for Innovation Development and Technology Transfer, Faculty of Medical Technology, Mahidol University, Bangkok 10700, Thailand, Tel.: +66 2 441 4370, Fax: +66 2 441 4380, E-mail:
| | - Virapong Prachayasittikul
- Department of Clinical Microbiology and Applied Technology, Faculty of Medical Technology, Mahidol University, Bangkok 10700, Thailand
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Dugrand A, Olry A, Duval T, Hehn A, Froelicher Y, Bourgaud F. Coumarin and furanocoumarin quantitation in citrus peel via ultraperformance liquid chromatography coupled with mass spectrometry (UPLC-MS). JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY 2013; 61:10677-10684. [PMID: 24117278 DOI: 10.1021/jf402763t] [Citation(s) in RCA: 81] [Impact Index Per Article: 7.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/02/2023]
Abstract
Coumarins and furanocoumarins are secondary metabolites commonly found in citrus plants. These molecules are allelochemical compounds in plants that have controversial effects on humans, such as phototoxicity and the commonly described interactions with drugs, referred to as the "grapefruit juice effect". Thus, it is important to develop a reliable method to identify and quantitate the coumarins and furanocoumarins in citrus extracts. For this purpose, we herein describe an ultraperformance liquid chromatography coupled with mass spectrometry (UPLC-MS)-based method. We first developed a rapid UPLC method (20 min) to separate the isomers of each furanocoumarin. A subsequent single ion monitoring MS detection method was performed to distinguish between the molecules, which were possibly coeluting but had different molecular weights. The method was successfully used to separate and quantitate 6 coumarins and 21 furanocoumarins in variable amounts within peel extracts (flavedo and albedo) of 6 varieties of Citrus (sweet orange, lemon, grapefruit, bergamot, pummelo, and clementine). This method combines high selectivity and sensitivity in a rapid analysis and is useful for fingerprinting Citrus species via their coumarin and furanocoumarin contents.
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Affiliation(s)
- Audray Dugrand
- Université de Lorraine , UMR 1121 Laboratoire Agronomie et Environnement Nancy-Colmar, 2 avenue de la forêt de Haye, TSA 40602, 54518 Vandœuvre-lès-Nancy, France
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Lin HL, D'Agostino J, Kenaan C, Calinski D, Hollenberg PF. The effect of ritonavir on human CYP2B6 catalytic activity: heme modification contributes to the mechanism-based inactivation of CYP2B6 and CYP3A4 by ritonavir. Drug Metab Dispos 2013; 41:1813-24. [PMID: 23886699 DOI: 10.1124/dmd.113.053108] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/28/2022] Open
Abstract
The mechanism-based inactivation of human CYP2B6 by ritonavir (RTV) in a reconstituted system was investigated. The inactivation is time, concentration, and NADPH dependent and exhibits a K(I) of 0.9 μM, a k(inact) of 0.05 min⁻¹, and a partition ratio of approximately 3. Liquid chromatography-tandem mass spectrometry (LC-MS/MS) analysis showed that the protonated molecular ion of RTV exhibits an m/z at 721 and its two major metabolites are an oxidation product with MH⁺ at m/z 737 and a deacylated product with MH⁺ at m/z 580. Inactivation of CYP2B6 by incubation with 10 μM RTV for 10 min resulted in an approximately 50% loss of catalytic activity and native heme, but no modification of the apoprotein was observed. RTV was found to be a potent mixed-type reversible inhibitor (K(i) = 0.33 μM) and a type II ligand (spectral dissociation constant-K(s) = 0.85 μM) of CYP2B6. Although previous studies have demonstrated that RTV is a potent mechanism-based inactivator of CYP3A4, the molecular mechanism responsible for the inactivation has not been determined. Here, we provide evidence that RTV inactivation of CYP3A4 is due to heme destruction with the formation of a heme-protein adduct. Similar to CYP2B6, there is no significant modification of the apoprotein. Furthermore, LC-MS/MS analysis revealed that both CYP3A4 and human liver microsomes form an RTV-glutathione conjugate having a MH⁺ at m/z 858 during metabolism of RTV, suggesting the formation of an isocyanate intermediate leading to formation of the conjugate.
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Affiliation(s)
- Hsia-lien Lin
- Department of Pharmacology, University of Michigan, Ann Arbor, Michigan
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Myung K, Manthey JA, Narciso JA. Protein sequestration of lipophilic furanocoumarins in grapefruit juice. JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY 2013; 61:667-673. [PMID: 23256844 DOI: 10.1021/jf304271s] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/01/2023]
Abstract
The sequestration of grapefruit furanocoumarins by foods was investigated by characterizing the binding between these compounds and foods with contrasting protein, fat, and carbohydrate compositions. Individual grapefruit furanocoumarins exhibited contrasting affinities to foods, where the lipophilic bergamottin and several structurally related dimers bound to foods more tightly than the more polar 6',7'-dihydroxybergamottin. From the investigation of different classes of macromolecules in foods, water-soluble proteins were found to be the major constituents responsible for furanocoumarin sequestration. Studies using bovine serum albumin as a model protein demonstrated the dissociation of grapefruit furanocoumarins from the insoluble juice cloud particles and the subsequent formation of water-soluble bovine serum albumin-furanocoumarin complexes. Fluorescence binding assays further demonstrated the binding of bergamottin and 6',7'-dihydroxybergamottin to bovine serum albumin. These results demonstrate that proteins can be sequestration agents of these important dietary furanocoumarins.
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Affiliation(s)
- Kyung Myung
- United States Horticultural Research Laboratory, Agricultural Research Service, United States Department of Agriculture, Fort Pierce, Florida 34945, United States.
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Araki N, Tsuruoka S, Hasegawa G, Yanagihara H, Omasa T, Enosawa S, Yamazoe Y, Fujimura A. Inhibition of CYP3A4 by 6',7'-dihydroxybergamottin in human CYP3A4 over-expressed hepG2 cells. ACTA ACUST UNITED AC 2012; 64:1715-21. [PMID: 23146034 DOI: 10.1111/j.2042-7158.2012.01562.x] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
OBJECTIVES We previously established HepG2-GS-3A4, a cell line from hepatoblastoma with overexpression of human CYP3A4 and glutamine synthetase (GS). We further reported that these cells can be applied for screening inhibitors of CYP3A4 in vitro. The purpose of this study was to determine whether our CYP3A4-overexpresed cell could be applied to evaluate mechanisms of CYP3A4 inhibition by 6',7'-dihydroxybergamottin (DHB), which is one of the major furanocoumarins in grapefruit juice, by using these cells. METHODS Nifedipine oxidation, activity and protein expression of NADPH-cytochrome reductase (POR) of HepG2-GS-3A4 cell were measured. CO-binding spectrumassay in microsomal fraction of the cells was also evaluated. KEY FINDINGS DHB and ketoconazole, a well-known inhibitor of CYP3A4, inhibited nifedipine oxidation in a concentration-dependent manner. DHB at a concentration of 3.0 µm, sufficient to inhibit the nifedipine oxidation, decreased POR activity; however, ketoconazole at a concentration of 0.9 µm, sufficient to inhibit the oxidation, did not affect the activity. The expression of POR protein in HepG2-GS-3A4 cells was not changed by either DHB or ketoconazole. The expression of CYP3A4 mRNA and protein was not changed by the addition of DHB or ketoconazole. DHB also reduced the absorption rate at 450 nm in a CO-binding spectrum assay without alteration of the wavelength of maximum absorption. The mean absorption value at 450 nm slightly decreased with ketoconazole; however, the difference was not significant. CONCLUSIONS We concluded that inhibition of CYP3A4 activity by DHB includes the inhibition of POR activity. HepG2-GS-3A4 might be a good tool to evaluate the mechanisms.
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Affiliation(s)
- Nobutaka Araki
- Department of Clinical Pharmacology, Jichi Medical University, Tochigi, Japan
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VandenBrink BM, Davis JA, Pearson JT, Foti RS, Wienkers LC, Rock DA. Cytochrome P450 Architecture and Cysteine Nucleophile Placement Impact Raloxifene-Mediated Mechanism-Based Inactivation. Mol Pharmacol 2012; 82:835-42. [DOI: 10.1124/mol.112.080739] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/27/2023] Open
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Quinney SK, Malireddy SR, Vuppalanchi R, Hamman MA, Chalasani N, Gorski JC, Hall SD. Rate of onset of inhibition of gut-wall and hepatic CYP3A by clarithromycin. Eur J Clin Pharmacol 2012; 69:439-48. [PMID: 22777148 DOI: 10.1007/s00228-012-1339-x] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/31/2012] [Accepted: 06/18/2012] [Indexed: 12/12/2022]
Abstract
AIMS To determine the extent and time-course of hepatic and intestinal cytochrome P450 3A (CYP3A) inactivation due to the mechanism-based inhibitor clarithromycin. METHODS Intestinal and hepatic CYP3A inhibition was examined in 12 healthy volunteers following the administration of single and multiple doses of oral clarithromycin (500 mg). Intestinal biopsies were obtained under intravenous midazolam sedation at baseline and after the first dose, on days 2-4, and on days 6-8 of the clarithromycin treatment. The formation of 1'-hydroxymidazolam in biopsy tissue and the serum 1'-hydroxymidazolam:midazolam ratio were indicators of intestinal and hepatic CYP3A activity, respectively. RESULTS Intestinal CYP3A activity decreased by 64 % (p = 0.0029) following the first dose of clarithromycin, but hepatic CYP3A activity did not significantly decrease. Repeated dosing of clarithromycin caused a significant decrease in hepatic CYP3A activity (p = 0.005), while intestinal activity showed little further decline. The CYP3A5 or CYP3A4*1B genotype were unable to account for inter-individual variability in CYP3A activity. CONCLUSIONS Following the administration of clarithromycin, the onset of hepatic CYP3A inactivation is delayed compared to that of intestinal CYP3A. The time-course of drug-drug interactions due to clarithromycin will vary with the relative contribution of intestinal and hepatic CYP3A to the clearance and bioavailability of a victim substrate.
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Affiliation(s)
- Sara K Quinney
- Division of Clinical Pharmacology, Department of Medicine, Indiana University School of Medicine, Indianapolis, IN, USA
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