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Metabolic activation of drugs by cytochrome P450 enzymes: Biochemical insights into mechanism-based inactivation by fibroblast growth factor receptor inhibitors and chemical approaches to attenuate reactive metabolite formation. Biochem Pharmacol 2022; 206:115336. [DOI: 10.1016/j.bcp.2022.115336] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/30/2022] [Revised: 10/26/2022] [Accepted: 10/26/2022] [Indexed: 11/06/2022]
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Valdiviezo A, Kato Y, Baker ES, Chiu WA, Rusyn I. Evaluation of Metabolism of a Defined Pesticide Mixture through Multiple In Vitro Liver Models. TOXICS 2022; 10:566. [PMID: 36287846 PMCID: PMC9609317 DOI: 10.3390/toxics10100566] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 07/18/2022] [Revised: 09/16/2022] [Accepted: 09/23/2022] [Indexed: 06/16/2023]
Abstract
The evaluation of exposure to multiple contaminants in a mixture presents a number of challenges. For example, the characterization of chemical metabolism in a mixture setting remains a research area with critical knowledge gaps. Studies of chemical metabolism typically utilize suspension cultures of primary human hepatocytes; however, this model is not suitable for studies of more extended exposures and donor-to-donor variability in a metabolic capacity is unavoidable. To address this issue, we utilized several in vitro models based on human-induced pluripotent stem cell (iPSC)-derived hepatocytes (iHep) to characterize the metabolism of an equimolar (1 or 5 µM) mixture of 20 pesticides. We used iHep suspensions and 2D sandwich cultures, and a microphysiological system OrganoPlate® 2-lane 96 (MimetasTM) that also included endothelial cells and THP-1 cell-derived macrophages. When cell culture media were evaluated using gas and liquid chromatography coupled to tandem mass spectrometry methods, we found that the parent molecule concentrations diminished, consistent with metabolic activity. This effect was most pronounced in iHep suspensions with a 1 µM mixture, and was lowest in OrganoPlate® 2-lane 96 for both mixtures. Additionally, we used ion mobility spectrometry-mass spectrometry (IMS-MS) to screen for metabolite formation in these cultures. These analyses revealed the presence of five primary metabolites that allowed for a more comprehensive evaluation of chemical metabolism in vitro. These findings suggest that iHep-based suspension assays maintain higher metabolic activity compared to 2D sandwich and OrganoPlate® 2-lane 96 model. Moreover, this study illustrates that IMS-MS can characterize in vitro metabolite formation following exposure to mixtures of environmental contaminants.
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Affiliation(s)
- Alan Valdiviezo
- Interdisciplinary Faculty of Toxicology, College of Veterinary Medicine and Biomedical Sciences, Texas A&M University, College Station, TX 77843, USA
- Department of Veterinary Physiology and Pharmacology, College of Veterinary Medicine and Biomedical Sciences, Texas A&M University, College Station, TX 77843, USA
| | - Yuki Kato
- Department of Veterinary Physiology and Pharmacology, College of Veterinary Medicine and Biomedical Sciences, Texas A&M University, College Station, TX 77843, USA
- Laboratory for Drug Discovery and Development, Shionogi Pharmaceutical Research Center, Shionogi & Co., Ltd., Osaka 561-0825, Japan
| | - Erin S. Baker
- Interdisciplinary Faculty of Toxicology, College of Veterinary Medicine and Biomedical Sciences, Texas A&M University, College Station, TX 77843, USA
- Department of Chemistry, North Carolina State University, Raleigh, NC 27695, USA
| | - Weihsueh A. Chiu
- Interdisciplinary Faculty of Toxicology, College of Veterinary Medicine and Biomedical Sciences, Texas A&M University, College Station, TX 77843, USA
- Department of Veterinary Physiology and Pharmacology, College of Veterinary Medicine and Biomedical Sciences, Texas A&M University, College Station, TX 77843, USA
| | - Ivan Rusyn
- Interdisciplinary Faculty of Toxicology, College of Veterinary Medicine and Biomedical Sciences, Texas A&M University, College Station, TX 77843, USA
- Department of Veterinary Physiology and Pharmacology, College of Veterinary Medicine and Biomedical Sciences, Texas A&M University, College Station, TX 77843, USA
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Chemotherapeutic and Safety Profile of a Fraction from Mimosa caesalpiniifolia Stem Bark. JOURNAL OF ONCOLOGY 2021; 2021:9031975. [PMID: 34917149 PMCID: PMC8670915 DOI: 10.1155/2021/9031975] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 07/23/2021] [Revised: 10/22/2021] [Accepted: 11/17/2021] [Indexed: 11/17/2022]
Abstract
Mimosa caesalpiniifolia (Fabaceae) is used by Brazilian people to treat hypertension, bronchitis, and skin infections. Herein, we evaluated the antiproliferative action of the dichloromethane fraction from M. caesalpiniifolia (DFMC) stem bark on murine tumor cells and the in vivo toxicogenetic profile. Initially, the cytotoxic activity of DFMC on primary cultures of Sarcoma 180 (S180) cells by Alamar Blue, trypan, and cytokinesis block micronucleus (CBMN) assays was assessed after 72 h of exposure, followed by the treatment of S180-bearing Swiss mice for 7 days, physiological investigations, and DNA/chromosomal damage. DFMC and betulinic acid revealed similar in vitro antiproliferative action on S180 cells and induced a reduction in viable cells, induced a reduction in viable cells and caused the emergence of bridges, buds, and morphological features of apoptosis and necrosis. S180-transplanted mice treated with DFMC (50 and 100 mg/kg/day), a betulinic acid-rich dichloromethane, showed for the first time in vivo tumor growth reduction (64.8 and 80.0%) and poorer peri- and intratumor quantities of vessels. Such antiproliferative action was associated with detectible side effects (loss of weight, reduction of spleen, lymphocytopenia, and neutrophilia and increasing of GOT and micronucleus in bone marrow), but preclinical general anticancer properties of the DFMC were not threatened by toxicological effects, and these biomedical discoveries validate the ethnopharmacological reputation of Mimosa species as emerging phytotherapy sources of lead molecules.
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Hughes TB, Dang NL, Kumar A, Flynn NR, Swamidass SJ. Metabolic Forest: Predicting the Diverse Structures of Drug Metabolites. J Chem Inf Model 2020; 60:4702-4716. [PMID: 32881497 PMCID: PMC8716321 DOI: 10.1021/acs.jcim.0c00360] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Abstract
Adverse drug metabolism often severely impacts patient morbidity and mortality. Unfortunately, drug metabolism experimental assays are costly, inefficient, and slow. Instead, computational modeling could rapidly flag potentially toxic molecules across thousands of candidates in the early stages of drug development. Most metabolism models focus on predicting sites of metabolism (SOMs): the specific substrate atoms targeted by metabolic enzymes. However, SOMs are merely a proxy for metabolic structures: knowledge of an SOM does not explicitly provide the actual metabolite structure. Without an explicit metabolite structure, computational systems cannot evaluate the new molecule's properties. For example, the metabolite's reactivity cannot be automatically predicted, a crucial limitation because reactive drug metabolites are a key driver of adverse drug reactions (ADRs). Additionally, further metabolic events cannot be forecast, even though the metabolic path of the majority of substrates includes two or more sequential steps. To overcome the myopia of the SOM paradigm, this study constructs a well-defined system-termed the metabolic forest-for generating exact metabolite structures. We validate the metabolic forest with the substrate and product structures from a large, chemically diverse, literature-derived dataset of 20 736 records. The metabolic forest finds a pathway linking each substrate and product for 79.42% of these records. By performing a breadth-first search of depth two or three, we improve performance to 88.43 and 88.77%, respectively. The metabolic forest includes a specialized algorithm for producing accurate quinone structures, the most common type of reactive metabolite. To our knowledge, this quinone structure algorithm is the first of its kind, as the diverse mechanisms of quinone formation are difficult to systematically reproduce. We validate the metabolic forest on a previously published dataset of 576 quinone reactions, predicting their structures with a depth three performance of 91.84%. The metabolic forest accurately enumerates metabolite structures, enabling promising new directions such as joint metabolism and reactivity modeling.
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Affiliation(s)
- Tyler B Hughes
- Department of Pathology and Immunology, Washington University School of Medicine, Campus Box 8118, 660 South Euclid Avenue, St. Louis, Missouri 63110, United States
| | - Na Le Dang
- Department of Pathology and Immunology, Washington University School of Medicine, Campus Box 8118, 660 South Euclid Avenue, St. Louis, Missouri 63110, United States
| | - Ayush Kumar
- Department of Pathology and Immunology, Washington University School of Medicine, Campus Box 8118, 660 South Euclid Avenue, St. Louis, Missouri 63110, United States
| | - Noah R Flynn
- Department of Pathology and Immunology, Washington University School of Medicine, Campus Box 8118, 660 South Euclid Avenue, St. Louis, Missouri 63110, United States
| | - S Joshua Swamidass
- Department of Pathology and Immunology, Washington University School of Medicine, Campus Box 8118, 660 South Euclid Avenue, St. Louis, Missouri 63110, United States
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Ferreira PMP, Santos DB, Silva JDN, Goudinho AF, Ramos CLS, Souza PCD, Almeida RSCD, Moura DS, Oliveira RD, Grisolia CK, Cavalheiro AJ, Carvalho Melo-Cavalcante AAD, Ferreira JRDO, Moraes Filho MOD, Pessoa C. Toxicological findings about an anticancer fraction with casearins described by traditional and alternative techniques as support to the Brazilian Unified Health System (SUS). JOURNAL OF ETHNOPHARMACOLOGY 2019; 241:112004. [PMID: 31152784 DOI: 10.1016/j.jep.2019.112004] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/15/2019] [Revised: 05/25/2019] [Accepted: 05/28/2019] [Indexed: 06/09/2023]
Abstract
ETHNOPHARMACOLOGICAL RELEVANCE Extracts, essential oils and molecules from Casearia sylvestris have popularly shown pharmacological actions against chronic diseases, as anxiety, inflammation, cancer and dyslipidemia. In the context of antitumoral therapy, we investigated in vitro, ex vivo and in vivo toxicological changes induced by a Fraction with Casearins (FC) and its component Casearin X isolated from C. sylvestris on animal and vegetal cells, and upon invertebrates and mammals. MATERIAL AND METHODS Cytotoxicity was carried out using normal lines and absorbance and flow cytometry techniques, Artemia salina nauplii, Danio rerio embryos and meristematic cells from Allium cepa roots. Acute and 30 days-mice analysis were done by behavioral, hematological and histological investigations and DNA/chromosomal damages detected by alkaline Cometa and micronucleus assays. RESULTS FC was cytotoxic against lung and fibroblasts cells and caused DNA breaks, loss of integrity and mitochondrial depolarization on ex vivo human leukocytes. It revealed 24 h-LC50 values of 48.8 and 36.7 μg/mL on A. salina nauplii and D. rerio embryos, reduced mitotic index of A. cepa roots, leading to cell cycle arrest at metaphase and anaphase and micronuclei. FC showed i.p. and oral LD50 values of 80.9 and 267.1 mg/kg body weight. Subacute i.p. injections induced loss of weight, swelling of hepatocytes and tubules, tubular and glomerular hemorrhage, microvesicular steatosis, lung inflammatory infiltration, augment of GPT, decrease of albumin, alkaline phosphatase, glucose, erythrocytes, and lymphocytes, and neutrophilia (p > 0.05). FC-treated animals at 10 mg/kg/day i.p. caused micronuclei in bone marrow and DNA strand breaks in peripheral leukocytes. CONCLUSIONS This research postulated suggestive side effects after use of FC-related drugs, demonstrating FC as antiproliferative and genotoxic on mammal and meristematic cells, including human leukocytes, teratogenicity upon zebrafish embryos, myelosuppression, clastogenicity, and morphological and biochemical markers indicating liver as main target for FC-induced systemic toxicity.
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Affiliation(s)
- Paulo Michel Pinheiro Ferreira
- Department of Biophysics and Physiology, Laboratory of Experimental Cancerology, Federal University of Piauí, Teresina, Brazil; Postgraduate Programs in Pharmaceutical Sciences and Biotechnology, Federal University of Piauí, Teresina, Brazil.
| | - Denise Barbosa Santos
- Department of Biophysics and Physiology, Laboratory of Experimental Cancerology, Federal University of Piauí, Teresina, Brazil; Postgraduate Programs in Pharmaceutical Sciences and Biotechnology, Federal University of Piauí, Teresina, Brazil
| | - Jurandy do Nascimento Silva
- Department of Biophysics and Physiology, Laboratory of Experimental Cancerology, Federal University of Piauí, Teresina, Brazil; Postgraduate Programs in Pharmaceutical Sciences and Biotechnology, Federal University of Piauí, Teresina, Brazil
| | - Amanda Freitas Goudinho
- Department of Biophysics and Physiology, Laboratory of Experimental Cancerology, Federal University of Piauí, Teresina, Brazil
| | - Carla Lorena Silva Ramos
- Department of Biophysics and Physiology, Laboratory of Experimental Cancerology, Federal University of Piauí, Teresina, Brazil; Postgraduate Programs in Pharmaceutical Sciences and Biotechnology, Federal University of Piauí, Teresina, Brazil
| | | | | | - Diego Sousa Moura
- Department of Genetics and Morphology, Institute of Biological Sciences, University of Brasília, Brasília, Brazil
| | - Rhaul de Oliveira
- Department of Genetics and Morphology, Institute of Biological Sciences, University of Brasília, Brasília, Brazil
| | - Cesar Koppe Grisolia
- Department of Genetics and Morphology, Institute of Biological Sciences, University of Brasília, Brasília, Brazil
| | | | | | | | | | - Claudia Pessoa
- Department of Physiology and Pharmacology, Faculty of Medicine, Federal University of Ceará, Fortaleza, Brazil
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Zhao Q, Zhang T, Xiao X, Huang J, Wang Y, Gonzalez FJ, Li F. Impaired clearance of sunitinib leads to metabolic disorders and hepatotoxicity. Br J Pharmacol 2019; 176:2162-2178. [PMID: 30875096 PMCID: PMC6555861 DOI: 10.1111/bph.14664] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/17/2018] [Revised: 01/23/2019] [Accepted: 03/05/2019] [Indexed: 12/12/2022] Open
Abstract
BACKGROUND AND PURPOSE Sunitinib is a small-molecule TK inhibitor associated with hepatotoxicity. The mechanisms of its toxicity are still unclear. EXPERIMENTAL APPROACH In the present study, mice were treated with 60, 150, and 450 mg·kg-1 sunitinib to evaluate sunitinib hepatotoxicity. Sunitinib metabolites and endogenous metabolites in liver, serum, faeces, and urine were analysed using ultra-performance LC electrospray ionization quadrupole time-of-flight MS-based metabolomics. KEY RESULTS Four reactive metabolites and impaired clearance of sunitinib in liver played a dominant role in sunitinib-induced hepatotoxicity. Using a non-targeted metabolomics approach, various metabolic pathways, including mitochondrial fatty acid β-oxidation (β-FAO), bile acids, lipids, amino acids, nucleotides, and tricarboxylic acid cycle intermediates, were disrupted after sunitinib treatment. CONCLUSIONS AND IMPLICATIONS These studies identified significant alterations in mitochondrial β-FAO and bile acid homeostasis. Activation of PPARα and inhibition of xenobiotic metabolism may be of value in attenuating sunitinib hepatotoxicity.
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Affiliation(s)
- Qi Zhao
- State Key Laboratory of Phytochemistry and Plant Resources in West China Kunming Institute of BotanyChinese Academy of SciencesKunmingChina
- University of Chinese Academy of SciencesBeijingChina
| | - Ting Zhang
- State Key Laboratory of Phytochemistry and Plant Resources in West China Kunming Institute of BotanyChinese Academy of SciencesKunmingChina
- University of Chinese Academy of SciencesBeijingChina
| | - Xue‐Rong Xiao
- State Key Laboratory of Phytochemistry and Plant Resources in West China Kunming Institute of BotanyChinese Academy of SciencesKunmingChina
| | - Jian‐Feng Huang
- State Key Laboratory of Phytochemistry and Plant Resources in West China Kunming Institute of BotanyChinese Academy of SciencesKunmingChina
- University of Chinese Academy of SciencesBeijingChina
| | - Yan Wang
- Department of PathologyThe Second Affiliated Hospital of Kunming Medical UniversityKunmingChina
| | - Frank J. Gonzalez
- Laboratory of Metabolism, Center for Cancer ResearchNational Cancer Institute, National Institutes of HealthBethesdaMD
| | - Fei Li
- State Key Laboratory of Phytochemistry and Plant Resources in West China Kunming Institute of BotanyChinese Academy of SciencesKunmingChina
- Jiangxi University of Traditional Chinese MedicineNanchangChina
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Chaikuad A, Koch P, Laufer SA, Knapp S. The Cysteinome of Protein Kinases as a Target in Drug Development. Angew Chem Int Ed Engl 2018; 57:4372-4385. [DOI: 10.1002/anie.201707875] [Citation(s) in RCA: 136] [Impact Index Per Article: 22.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/01/2017] [Revised: 09/20/2017] [Indexed: 01/04/2023]
Affiliation(s)
- Apirat Chaikuad
- Nuffield Department of Clinical Medicine; Structural Genomics Consortium and Target Discovery Institute; University of Oxford, Old Road Campus Research Building; Roosevelt Drive Oxford OX3 7DQ UK
- Institute for Pharmaceutical Chemistry; Goethe-University; Max-von-Laue-Strasse 9 60438 Frankfurt am Main Germany
| | - Pierre Koch
- Department of Pharmaceutical/Medicinal Chemistry; Eberhard-Karls-University Tübingen; Auf der Morgenstelle 8 72076 Tübingen Germany
| | - Stefan A. Laufer
- Department of Pharmaceutical/Medicinal Chemistry; Eberhard-Karls-University Tübingen; Auf der Morgenstelle 8 72076 Tübingen Germany
- German Cancer Consortium DKTK, Standort Tübingen; Germany
| | - Stefan Knapp
- Nuffield Department of Clinical Medicine; Structural Genomics Consortium and Target Discovery Institute; University of Oxford, Old Road Campus Research Building; Roosevelt Drive Oxford OX3 7DQ UK
- German Cancer Consortium DKTK, Standort Frankfurt/Mainz; Germany
- Institute for Pharmaceutical Chemistry; Goethe-University; Max-von-Laue-Strasse 9 60438 Frankfurt am Main Germany
- Structural Genomics Consortium and Buchmann Institute for Molecular Life Sciences; Johann Wolfgang Goethe-University; Max-von-Laue-Strasse 15 60438 Frankfurt am Main Germany
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Chaikuad A, Koch P, Laufer SA, Knapp S. Das Cysteinom der Proteinkinasen als Zielstruktur in der Arzneistoffentwicklung. Angew Chem Int Ed Engl 2018. [DOI: 10.1002/ange.201707875] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Affiliation(s)
- Apirat Chaikuad
- Nuffield Department of Clinical Medicine; Structural Genomics Consortium and Target Discovery Institute; Universität Oxford, Old Road Campus Research Building; Roosevelt Drive Oxford OX3 7DQ Großbritannien
- Institut für pharmazeutische Chemie; Johann Wolfgang Goethe-Universität; Max-von-Laue-Straße 9 60438 Frankfurt am Main Deutschland
| | - Pierre Koch
- Institut für pharmazeutische und medizinische Chemie; Eberhard-Karls-Universität Tübingen; Auf der Morgenstelle 8 72076 Tübingen Deutschland
| | - Stefan A. Laufer
- Institut für pharmazeutische und medizinische Chemie; Eberhard-Karls-Universität Tübingen; Auf der Morgenstelle 8 72076 Tübingen Deutschland
- Deutsches Zentrum für translationale Krebsforschung, Standort; Tübingen Deutschland
| | - Stefan Knapp
- Nuffield Department of Clinical Medicine; Structural Genomics Consortium and Target Discovery Institute; Universität Oxford, Old Road Campus Research Building; Roosevelt Drive Oxford OX3 7DQ Großbritannien
- Deutsches Zentrum für translationale Krebsforschung, Standort Frankfurt/Mainz; Deutschland
- Institut für pharmazeutische Chemie; Johann Wolfgang Goethe-Universität; Max-von-Laue-Straße 9 60438 Frankfurt am Main Deutschland
- Structural Genomics Consortium and Buchmann Institute for Molecular Life Sciences; Johann Wolfgang Goethe-Universität; Max-von-Laue-Straße 15 60438 Frankfurt am Main Deutschland
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Baillie TA. Targeted Covalent Inhibitors for Drug Design. Angew Chem Int Ed Engl 2016; 55:13408-13421. [DOI: 10.1002/anie.201601091] [Citation(s) in RCA: 292] [Impact Index Per Article: 36.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/30/2016] [Indexed: 12/14/2022]
Affiliation(s)
- Thomas A. Baillie
- Department of Medicinal Chemistry, School of Pharmacy; University of Washington; Box 357610 Seattle WA 98195-7610 USA
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Affiliation(s)
- Thomas A. Baillie
- Department of Medicinal Chemistry, School of Pharmacy; University of Washington; Box 357610 Seattle WA 98195-7610 USA
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Ferreira PMP, Bezerra DP, Silva JDN, da Costa MP, Ferreira JRDO, Alencar NMN, Figueiredo ISTD, Cavalheiro AJ, Machado CML, Chammas R, Alves APNN, Moraes MOD, Pessoa C. Preclinical anticancer effectiveness of a fraction from Casearia sylvestris and its component Casearin X: in vivo and ex vivo methods and microscopy examinations. JOURNAL OF ETHNOPHARMACOLOGY 2016; 186:270-279. [PMID: 27067367 DOI: 10.1016/j.jep.2016.04.011] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/10/2016] [Revised: 04/07/2016] [Accepted: 04/07/2016] [Indexed: 06/05/2023]
Abstract
ETHNOPHARMACOLOGICAL RELEVANCE Casearia sylvestris (Salicaceae) is found in South America and presents antiulcerogenic, cytotoxic, antimicrobial, anti-inflammatory and antihypertensive activities. AIM OF THE STUDY To assess the in vivo and ex vivo antitumor action of a fraction with casearins (FC) and its main component - Casearin X-isolated from C. sylvestris leaves. MATERIALS AND METHODS Firstly, Sarcoma 180 bearing Swiss mice were treated with FC and Cas X for 7 days. Secondly, BALB/c nude animals received hollow fibers with colon carcinoma (HCT-116) or glioblastoma (SF-295) cells and were treated with FC for 4 days. On 5th day, proliferation was determined by MTT assay. RESULTS FC 10 and 25mg/kg/day i.p. and 50mg/kg/day oral and Cas X 25mg/kg/day i.p. and 50mg/kg/day oral revealed tumor growth inhibition rates of 35.8, 86.2, 53.7, 90.0 and 65.5% and such tumors demonstrated rare mitoses and coagulation necrosis areas. Similarly, FC reduced multiplying of HCT-116 and SF-295 cells when evaluated by the Hollow Fiber Assay (2.5 and 5mg/kg/day i.p. and 25 and 50mg/kg/day oral), with cell growth inhibition rates ranging from 33.3 to 67.4% (p<0.05). Flow cytometry experiments revealed that FC reduced membrane integrity and induced DNA fragmentation and mitochondrial depolarization (p<0.05). CONCLUSIONS FC and Cas X were efficient antitumor substances against murine and human cancer cells and caused reversible morphological changes in liver, kidneys and spleens, emphasizing clerodane diterpenes as an emerging class of anticancer molecules.
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Affiliation(s)
- Paulo Michel Pinheiro Ferreira
- Laboratory in Experimental Cancerology, Department of Biophysics and Physiology, Federal University of Piauí, Teresina, Brazil; Postgraduate Program in Pharmaceutical Sciences, Federal University of Piauí, Teresina, Brazil; Postgraduate Program in Biotechnology, Federal University of Piauí, Teresina, Brazil.
| | | | | | - Marcília Pinheiro da Costa
- Postgraduate Program in Pharmaceutical Sciences, Federal University of Piauí, Teresina, Brazil; Department of Pharmacy, Federal University of Piauí, Teresina, Brazil
| | | | - Nylane Maria Nunes Alencar
- Department of Physiology and Pharmacology, Faculty of Medicine, Federal University of Ceará, Fortaleza, Brazil
| | | | | | - Camila Maria Longo Machado
- Radioisotopes Research Laboratory, Center for Medical Nuclear, State University of São Paulo, São Paulo, Brazil
| | - Roger Chammas
- Department of Radiology, Faculty of Medicine, State University of São Paulo, São Paulo, Brazil
| | | | - Manoel Odorico de Moraes
- Department of Physiology and Pharmacology, Faculty of Medicine, Federal University of Ceará, Fortaleza, Brazil
| | - Claudia Pessoa
- Department of Physiology and Pharmacology, Faculty of Medicine, Federal University of Ceará, Fortaleza, Brazil; Oswaldo Cruz Foundation, Fortaleza, Brazil
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ARAÚJO ÉVERTONJOSÉFERREIRADE, OLIVEIRA GUILHERMEANTÔNIOLOPESDE, SOUSA LÍVIAQUEIROZDE, BOLZANI VANDERLANDASILVA, CAVALHEIRO ALBERTOJOSÉ, TOME ADRIANADAROCHA, PERON ANAPAULA, SANTOS ANDRÉGONZAGADOS, CITÓ ANTONIAMARIADASGRAÇASLOPES, PESSOA CLÁUDIA, FREITAS RIVELILSONMENDESDE, FERREIRA PAULOMICHELPINHEIRO. Counteracting effects on free radicals and histological alterations induced by a fraction with casearins. ACTA ACUST UNITED AC 2015; 87:1791-807. [DOI: 10.1590/0001-3765201520150149] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
ABSTRACTCasearia sylvestris Swartz is a medicinal plant widely distributed in Brazil. It has anti-inflammatory, antiulcer and antitumor activities and is popularly used to treat snakebites, wounds, diarrhea, flu and chest colds. Its leaves are rich in oxygenated tricyclic cis-clerodane diterpenes, particulary casearins. Herein, we evaluated the antioxidant activities of a fraction with casearins (FC) isolated from C. sylvestrisand histological changes on the central nervous system and livers of Mus musculus mice. Firstly, in vitro studies (0.9, 1.8, 3.6, 5.4 and 7.2 μg/mL) revealed EC50 values of 3.7, 6.4 and 0.16 µg/mL for nitrite, hydroxyl radical and TBARS levels, respectively. Secondly, FC (2.5, 5, 10 and 25 mg/kg/day) was intraperitoneally administered to Swiss mice for 7 consecutive days. Nitrite levels in the hippocampus (26.2, 27.3, 30.2 and 26.6 µM) and striatum (26.3, 25.4, 34.3 and 27.5 µM) increased in all treated animals (P < 0.05). Lower doses dropped reduced glutathione, catalase and TBARS levels in the hippocampus and striatum. With the exception of this reduction in TBARS formation, FC displayed only in vitro antioxidant activity. Animals exhibited histological alterations suggestive of neurotoxicity and hepatotoxicity, indicating the need for precaution regarding the consumption of medicinal formulations based on Casearia sylvestris.
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Alexander T, Iglesia E, Park Y, Duncan D, Peden D, Sheikh S, Ferris M. Severe DRESS syndrome managed with therapeutic plasma exchange. Pediatrics 2013; 131:e945-9. [PMID: 23420918 DOI: 10.1542/peds.2012-2117] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/24/2022] Open
Abstract
Drug reaction with eosinophilia and systemic symptoms (DRESS) syndrome is a rare but increasingly described phenomenon of immune activation and organ dysfunction in association with a wide variety of medications. This reaction shows a broad spectrum of clinical presentation and severity, ranging from mild to lethal. Treatment strategies of immune suppression appear be helpful in some cases, but treatment failures occur frequently with reported mortality rates of 5% to 10%. We present a pediatric case of DRESS syndrome associated with either lamotrigine or bupropion, leading to multiorgan involvement and life-threatening complications of respiratory failure and cardiac arrest. After failing to improve with removal of these medications and administration of systemic corticosteroids, our patient showed dramatic, sustained clinical response to therapeutic plasma exchange. To our knowledge, this is the first reported case of therapeutic plasma exchange used for life-threatening DRESS syndrome in a pediatric patient. This case suggests needed research for this therapeutic option in life-threatening DRESS syndrome resistant to high-dose steroids.
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Affiliation(s)
- Thomas Alexander
- Department of Pediatrics, University of North Carolina at Chapel Hill, Chapel Hill, NC, USA.
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Williams DP, Shipley R, Ellis MJ, Webb S, Ward J, Gardner I, Creton S. Novel in vitro and mathematical models for the prediction of chemical toxicity. Toxicol Res (Camb) 2013; 2:40-59. [PMID: 26966512 PMCID: PMC4765367 DOI: 10.1039/c2tx20031g] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/22/2012] [Accepted: 08/24/2012] [Indexed: 01/17/2023] Open
Abstract
The focus of much scientific and medical research is directed towards understanding the disease process and defining therapeutic intervention strategies. The scientific basis of drug safety is very complex and currently remains poorly understood, despite the fact that adverse drug reactions (ADRs) are a major health concern and a serious impediment to development of new medicines. Toxicity issues account for ∼21% drug attrition during drug development and safety testing strategies require considerable animal use. Mechanistic relationships between drug plasma levels and molecular/cellular events that culminate in whole organ toxicity underpins development of novel safety assessment strategies. Current in vitro test systems are poorly predictive of toxicity of chemicals entering the systemic circulation, particularly to the liver. Such systems fall short because of (1) the physiological gap between cells currently used and human hepatocytes existing in their native state, (2) the lack of physiological integration with other cells/systems within organs, required to amplify the initial toxicological lesion into overt toxicity, (3) the inability to assess how low level cell damage induced by chemicals may develop into overt organ toxicity in a minority of patients, (4) lack of consideration of systemic effects. Reproduction of centrilobular and periportal hepatocyte phenotypes in in vitro culture is crucial for sensitive detection of cellular stress. Hepatocyte metabolism/phenotype is dependent on cell position along the liver lobule, with corresponding differences in exposure to substrate, oxygen and hormone gradients. Application of bioartificial liver (BAL) technology can encompass in vitro predictive toxicity testing with enhanced sensitivity and improved mechanistic understanding. Combining this technology with mechanistic mathematical models describing intracellular metabolism, fluid-flow, substrate, hormone and nutrient distribution provides the opportunity to design the BAL specifically to mimic the in vivo scenario. Such mathematical models enable theoretical hypothesis testing, will inform the design of in vitro experiments, and will enable both refinement and reduction of in vivo animal trials. In this way, development of novel mathematical modelling tools will help to focus and direct in vitro and in vivo research, and can be used as a framework for other areas of drug safety science.
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Affiliation(s)
- Dominic P Williams
- MRC Centre for Drug Safety Science , Department of Molecular and Clinical Pharmacology , Institute of Translational Medicine , The University of Liverpool , Sherrington Building , Ashton St. , Liverpool , L69 3GE , UK . ; ; Tel: +44 (0)151 794 5791
| | - Rebecca Shipley
- Department of Mechanical Engineering , University College London , Torrington Place , London WC1E 7JE , UK
| | - Marianne J Ellis
- Department of Chemical Engineering , University of Bath , Claverton Down , Bath , BA2 7AY , UK
| | - Steve Webb
- Department of Mathematics and Statistics , University of Strathclyde , Livingstone Tower , 26 Richmond Street , Glasgow , G1 1XH , UK
| | - John Ward
- School of Mathematical Sciences , Loughborough University , Loughborough , LE11 3TU , UK
| | - Iain Gardner
- Simcyp Limited , Blades Enterprise Centre , John Street , Sheffield S2 4SU , UK
| | - Stuart Creton
- NC3Rs Gibbs Building , 215 Euston Road , London , NW1 2BE , UK
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15
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Stachulski AV, Baillie TA, Kevin Park B, Scott Obach R, Dalvie DK, Williams DP, Srivastava A, Regan SL, Antoine DJ, Goldring CEP, Chia AJL, Kitteringham NR, Randle LE, Callan H, Castrejon JL, Farrell J, Naisbitt DJ, Lennard MS. The Generation, Detection, and Effects of Reactive Drug Metabolites. Med Res Rev 2012; 33:985-1080. [DOI: 10.1002/med.21273] [Citation(s) in RCA: 65] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
Affiliation(s)
- Andrew V. Stachulski
- Department of Chemistry, Robert Robinson Laboratories; University of Liverpool; Liverpool; L69 7ZD; UK
| | - Thomas A. Baillie
- School of Pharmacy; University of Washington; Box 357631; Seattle; Washington; 98195-7631
| | - B. Kevin Park
- Department of Molecular and Clinical Pharmacology; MRC Centre for Drug Safety Science; Institute of Translational Medicine; University of Liverpool; Sherrington Buildings, Ashton Street; Liverpool L69 3GE; UK
| | - R. Scott Obach
- Pharmacokinetics, Dynamics and Metabolism; Pfizer Worldwide Research & Development; Groton; Connecticut 06340
| | - Deepak K. Dalvie
- Pharmacokinetics, Dynamics and Metabolism; Pfizer Worldwide Research & Development; La Jolla; California 94121
| | - Dominic P. Williams
- Department of Molecular and Clinical Pharmacology; MRC Centre for Drug Safety Science; Institute of Translational Medicine; University of Liverpool; Sherrington Buildings, Ashton Street; Liverpool L69 3GE; UK
| | - Abhishek Srivastava
- Department of Molecular and Clinical Pharmacology; MRC Centre for Drug Safety Science; Institute of Translational Medicine; University of Liverpool; Sherrington Buildings, Ashton Street; Liverpool L69 3GE; UK
| | - Sophie L. Regan
- Department of Molecular and Clinical Pharmacology; MRC Centre for Drug Safety Science; Institute of Translational Medicine; University of Liverpool; Sherrington Buildings, Ashton Street; Liverpool L69 3GE; UK
| | - Daniel J. Antoine
- Department of Molecular and Clinical Pharmacology; MRC Centre for Drug Safety Science; Institute of Translational Medicine; University of Liverpool; Sherrington Buildings, Ashton Street; Liverpool L69 3GE; UK
| | - Christopher E. P. Goldring
- Department of Molecular and Clinical Pharmacology; MRC Centre for Drug Safety Science; Institute of Translational Medicine; University of Liverpool; Sherrington Buildings, Ashton Street; Liverpool L69 3GE; UK
| | - Alvin J. L. Chia
- Department of Molecular and Clinical Pharmacology; MRC Centre for Drug Safety Science; Institute of Translational Medicine; University of Liverpool; Sherrington Buildings, Ashton Street; Liverpool L69 3GE; UK
| | - Neil R. Kitteringham
- Department of Molecular and Clinical Pharmacology; MRC Centre for Drug Safety Science; Institute of Translational Medicine; University of Liverpool; Sherrington Buildings, Ashton Street; Liverpool L69 3GE; UK
| | - Laura E. Randle
- School of Pharmacy and Biomolecular Sciences, Faculty of Science; Liverpool John Moores University; James Parsons Building, Byrom Street; Liverpool L3 3AF; UK
| | - Hayley Callan
- Department of Molecular and Clinical Pharmacology; MRC Centre for Drug Safety Science; Institute of Translational Medicine; University of Liverpool; Sherrington Buildings, Ashton Street; Liverpool L69 3GE; UK
| | - J. Luis Castrejon
- Department of Molecular and Clinical Pharmacology; MRC Centre for Drug Safety Science; Institute of Translational Medicine; University of Liverpool; Sherrington Buildings, Ashton Street; Liverpool L69 3GE; UK
| | - John Farrell
- Department of Molecular and Clinical Pharmacology; MRC Centre for Drug Safety Science; Institute of Translational Medicine; University of Liverpool; Sherrington Buildings, Ashton Street; Liverpool L69 3GE; UK
| | - Dean J. Naisbitt
- Department of Molecular and Clinical Pharmacology; MRC Centre for Drug Safety Science; Institute of Translational Medicine; University of Liverpool; Sherrington Buildings, Ashton Street; Liverpool L69 3GE; UK
| | - Martin S. Lennard
- Academic Unit of Medical Education; University of Sheffield; 85 Wilkinson Street; Sheffield S10 2GJ; UK
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16
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Abstract
Adverse drug reactions are a difficult problem faced by clinicians in everyday practice. The mechanisms of drug hypersensitivity are not well understood. This is reflected by difficulties in their classification, which is mainly based upon the current knowledge of immunologic and nonimmunologic mechanisms, onset of symptoms (immediate or nonimmediate) and morphology. For the individual patient, the correct diagnosis and classification is important because strict avoidance of the offending drug might be of vital importance. Considerable experience is required to guide management, to interpret results of investigations and to undertake drug challenges. This article summarizes the current knowledge regarding definitions and mechanisms. However, the field of drug hypersensitivity is rapidly expanding. Modern drugs such as biological agents bare hypersensitivity risks that are potentially mediated by, so far, unknown mechanisms.
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Affiliation(s)
- Bettina Wedi
- Allergy Division, Department of Dermatology and Allergy, Hannover Medical School, Ricklinger Str. 5, D-30449 Hannover, Germany.
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17
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Rodrigues Coutinho AP, de Moraes LAB, Barata LES, de Souza AO. Effects of the antimycobacterial compound 2-phenoxy-1-phenylethanone on rat hepatocytes and formation of metabolites. PHARMACEUTICAL BIOLOGY 2012; 50:1317-1325. [PMID: 22857008 DOI: 10.3109/13880209.2012.674949] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/01/2023]
Abstract
CONTEXT Neolignans are usually dimers formed by oxidative coupling of allyl and propenyl phenols, and the neolignan analogue, 2-phenoxy-1-phenylethanone (LS-2) is a promising antimycobacterial compound showing very weak cytotoxicity in mammalian cells and lack of acute toxicity in murine models. OBJECTIVES To investigate the mechanism of action of LS-2 in rat hepatocytes by evaluating the activity levels of enzymes related to oxidation status and drug-metabolizing activity. MATERIALS AND METHODS Hepatocytes were treated with LS-2 from 0.05 up to 1 mM, for 24 and 48 h, and reduced glutathione (GSH), lipid peroxidation and cytochrome P450 enzyme (CYP450) activity were assayed. A homologous series of phenoxazone ethers were used as substrates to measure the enzymatic profile. The biotransformation of LS-2 was studied in hepatocytes by gas chromatography-mass spectrometry (GC-MS) for detection and analysis of possible metabolites. RESULTS Hepatocytes treated with LS-2 up to 1 mM for 24 or 48 h did not induce the formation of GSH and lipid peroxidation. O-Dealkylation activities of the isoenzymes CYP4501A1, CYP4501A2, CYP4502B1 and CYP4502B2 were also not detected in the hepatocytes treated with LS-2 for 24 or 48 h. DISCUSSION AND CONCLUSION The results indicate that LS-2 or its two detected metabolites, 2-phenoxy-1-phenylethanol and 2,4-(2-hydroxy-2-phenylethoxy)phenol, are not cytotoxic to rat hepatocytes. These compounds maintain a balance between the production of pro-oxidant agents and their respective antioxidant systems. The data show that enzymes related to oxidation status and drug-metabolizing activities are not involved in the mechanism of action of LS-2.
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18
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Abstract
The liver is necessary for survival. Its strategic localisation, blood flow and prominent role in the metabolism of xenobiotics render this organ particularly susceptible to injury by chemicals to which we are ubiquitously exposed. The pathogenesis of most chemical-induced liver injuries is initiated by the metabolic conversion of chemicals into reactive intermediate species, such as electrophilic compounds or free radicals, which can potentially alter the structure and function of cellular macromolecules. Many reactive intermediate species can produce oxidative stress, which can be equally detrimental to the cell. When protective defences are overwhelmed by excess toxicant insult, the effects of reactive intermediate species lead to deregulation of cell signalling pathways and dysfunction of biomolecules, leading to failure of target organelles and eventual cell death. A myriad of genetic factors determine the susceptibility of specific individuals to chemical-induced liver injury. Environmental factors, lifestyle choices and pre-existing pathological conditions also have roles in the pathogenesis of chemical liver injury. Research aimed at elucidating the molecular mechanism of the pathogenesis of chemical-induced liver diseases is fundamental for preventing or devising new modalities of treatment for liver injury by chemicals.
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19
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Rousu T, Tolonen A. Characterization of cyanide-trapped methylated metabonates formed during reactive drug metabolite screening in vitro. RAPID COMMUNICATIONS IN MASS SPECTROMETRY : RCM 2011; 25:1382-1390. [PMID: 21504003 DOI: 10.1002/rcm.5005] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/30/2023]
Abstract
Reactive metabolites are estimated to be one of the main reasons behind unexpected drug-induced toxicity, by binding covalently to cell proteins or DNA. Due to their high reactivity and short lifespan, reactive metabolites are analyzed after chemical trapping with nucleophilic agents such as glutathione or cyanide. Recently, unexplained and uncharacterized methylated reaction products were reported in a human liver microsome based reactive metabolite trapping assay utilizing potassium cyanide as a trapping agent. Here, a similar assay was utilized to produce mono- or dimethylated and further cyanide-trapped reaction products from propranolol, amlodipine and ciprofloxacin, followed by ultra-performance liquid chromatography/time-of-flight mass spectrometry (UPLC/TOF-MS) and ultra-performance liquid chromatography/tandem mass spectrometry (UPLC/MS/MS) experiments for their more detailed structural elucidation. Formation of all observed cyanide-trapped products was clearly NADPH-dependent and thus metabolism-mediated. The suggested reaction pathways included N-methylation leading to iminium formation in primary and/or secondary amines preceded by cytochrome P450 (CYP)-mediated reactions. As the methylation reaction was suggested to be involved in formation of the actual reactive iminium ion, the observed cyanide-trapped products were experimental artifacts rather than trapped reactive metabolites. The results stress that to avoid overestimating the formation of reactive metabolites in vitro, this methylation phenomenon should be taken into account when interpreting the results of cyanide-utilizing reactive metabolite trapping assays. This in turn emphasizes the importance of identification of the observed cyano conjugates during such studies. Yet, metabolite identification has a high importance to avoid overestimation of in vitro metabolic clearance in the cases where this kind of metabonate formation has a high impact in the disappearance rate of the compound.
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Affiliation(s)
- Timo Rousu
- Department of Chemistry, University of Oulu, P.O. Box 3000, 90014 Oulu, Finland
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20
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Sukardi H, Chng HT, Chan ECY, Gong Z, Lam SH. Zebrafish for drug toxicity screening: bridging thein vitrocell-based models andin vivomammalian models. Expert Opin Drug Metab Toxicol 2011; 7:579-89. [DOI: 10.1517/17425255.2011.562197] [Citation(s) in RCA: 87] [Impact Index Per Article: 6.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
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21
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Krishnan S, Abeykoon A, Schenkman JB, Rusling JF. Control of electrochemical and ferryloxy formation kinetics of cyt P450s in polyion films by heme iron spin state and secondary structure. J Am Chem Soc 2010; 131:16215-24. [PMID: 19886700 DOI: 10.1021/ja9065317] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Voltammetry of cytochrome P450 (cyt P450) enzymes in ultrathin films with polyions was related for the first time to electronic and secondary structure. Heterogeneous electron transfer (hET) rate constants for reduction of the cyt P450s depended on heme iron spin state, with low spin cyt P450cam giving a value 40-fold larger than high spin human cyt P450 1A2, with mixed spin human P450 cyt 2E1 at an intermediate value. Asymmetric reduction-oxidation peak separations with increasing scan rates were explained by simulations featuring faster oxidation than reduction. Results are consistent with a square scheme in which oxidized and reduced forms of cyt P450s each participate in rapid conformational equilibria. Rate constants for oxidation of ferric cyt P450s in films by t-butyl hydroperoxide to active ferryloxy cyt P450s from rotating disk voltammetry suggested a weaker dependence on spin state, but in the reverse order of the observed hET reduction rates. Oxidation and reduction rates of cyt P450s in the films are also likely to depend on protein secondary structure around the heme iron.
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Affiliation(s)
- Sadagopan Krishnan
- Department of Chemistry, University of Connecticut, Storrs, Connecticut 06269, USA
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22
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Abstract
Drugs are generally converted to biologically inactive forms and eliminated from the body, principally by hepatic metabolism. However, certain drugs undergo biotransformation to metabolites that can interfere with cellular functions through their intrinsic chemical reactivity towards glutathione, leading to thiol depletion, and functionally critical macromolecules, resulting in reversible modification, irreversible adduct formation, and irreversible loss of activity. There is now a great deal of evidence which shows that reactive metabolites are formed from drugs known to cause hepatotoxicity, such as acetaminophen, tamoxifen, isoniazid, and amodiaquine. The main theme of this article is to review the evidence for chemically reactive metabolites being initiating factors for the multiple downstream biological events culminating in toxicity. The major objectives are to understand those idiosyncratic hepatotoxicities thought to be caused by chemically reactive metabolites and to define the role of toxic metabolites.
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23
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Andrade RJ, Robles M, Ulzurrun E, Lucena MI. Drug-induced liver injury: insights from genetic studies. Pharmacogenomics 2009; 10:1467-87. [PMID: 19761370 DOI: 10.2217/pgs.09.111] [Citation(s) in RCA: 78] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/08/2023] Open
Abstract
Drug-induced liver injury (DILI) is an increasing health problem and a challenge for physicians, regulatory bodies and the pharmaceutical industry, not only because of its potential severity and elusive pathogenesis but also because it is often inaccurately diagnosed, commonly missed entirely and more often not reported. The general view is that idiosyncratic DILI, which is not predictable whether based on the pharmacology of the drug or on the dose administered, is determined by the presence in the recipient of variants in, or expression of, genes coding for key metabolic pathways and/or the immune response, and the interaction of these genetic variants with environmental variables. Furthermore, idiosyncratic DILI is an example of a complex-trait disease with two or more susceptibility loci, as reflected by the frequency of genetic variants in the population often being higher than the occurrence of significant liver injury. Polymorphisms of bioactivation/toxification pathways via the CYP450 enzymes (Phase I), detoxification reactions (Phase II) and excretion/transport (Phase III), together with immunological factors that might determine DILI are reviewed. Challenges such as gene-trait association studies and whole-genome studies, and future approaches to the study of DILI are explored. Better knowledge of the candidate genes involved could provide further insight for the prospective identification of susceptible patients at risk of developing drug-induced hepatotoxicity, development of new diagnostic tools and new treatment strategies with safer drugs.
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Affiliation(s)
- Raúl J Andrade
- Unidad de Hepatología, Departamento de Medicina, Facultad de Medicina, Boulevard Louis Pasteur 32, 29071 Málaga, Spain.
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24
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Jian W, Yao M, Zhang D, Zhu M. Rapid Detection and Characterization of in Vitro and Urinary N-Acetyl-l-cysteine Conjugates Using Quadrupole-Linear Ion Trap Mass Spectrometry and Polarity Switching. Chem Res Toxicol 2009; 22:1246-55. [DOI: 10.1021/tx900035j] [Citation(s) in RCA: 48] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Wenying Jian
- Bioanalysis and Discovery Analytical Research and Biotransforamtion, Pharmaceutical Research and Development, Bristol-Myers Squibb, Princeton, New Jersey 08543
| | - Ming Yao
- Bioanalysis and Discovery Analytical Research and Biotransforamtion, Pharmaceutical Research and Development, Bristol-Myers Squibb, Princeton, New Jersey 08543
| | - Duxi Zhang
- Bioanalysis and Discovery Analytical Research and Biotransforamtion, Pharmaceutical Research and Development, Bristol-Myers Squibb, Princeton, New Jersey 08543
| | - Mingshe Zhu
- Bioanalysis and Discovery Analytical Research and Biotransforamtion, Pharmaceutical Research and Development, Bristol-Myers Squibb, Princeton, New Jersey 08543
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25
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Recent advances in applications of liquid chromatography–tandem mass spectrometry to the analysis of reactive drug metabolites. Chem Biol Interact 2009; 179:25-37. [DOI: 10.1016/j.cbi.2008.09.014] [Citation(s) in RCA: 110] [Impact Index Per Article: 7.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/01/2008] [Revised: 09/09/2008] [Accepted: 09/10/2008] [Indexed: 01/09/2023]
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26
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Rousu T, Pelkonen O, Tolonen A. Rapid detection and characterization of reactive drug metabolites in vitro using several isotope-labeled trapping agents and ultra-performance liquid chromatography/time-of-flight mass spectrometry. RAPID COMMUNICATIONS IN MASS SPECTROMETRY : RCM 2009; 23:843-855. [PMID: 19224530 DOI: 10.1002/rcm.3953] [Citation(s) in RCA: 47] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/27/2023]
Abstract
Reactive metabolites are believed to be one of the main reasons for unexpected drug-induced toxicity issues, by forming covalent adducts with cell proteins or DNA. Due to their high reactivity and short lifespan they are not directly detected by traditional analytical methods, but are most traditionally analyzed by liquid chromatography/tandem mass spectrometry (LC/MS/MS) after chemical trapping with nucleophilic agents such as glutathione. Here, a simple but very efficient assay was built up for screening reactive drug metabolites, utilizing stable isotope labeled glutathione, potassium cyanide and semicarbazide as trapping agents and highly sensitive ultra-performance liquid chromatography/time-of-flight mass spectrometry (UPLC/TOFMS) as an analytical tool. A group of twelve structurally different compounds was used as a test set, and a large number of trapped metabolites were detected for most of them, including many conjugates not reported previously. Glutathione-trapped metabolites were detected for nine of the twelve test compounds, whereas cyanide-trapped metabolites were found for eight and semicarbazide-trapped for three test compounds. The high mass accuracy of TOFMS provided unambiguous identification of change in molecular formula by formation of a reactive metabolite. In addition, use of a mass defect filter was found to be a usable tool when mining the trapped conjugates from the acquired data. The approach was shown to provide superior detection sensitivity in comparison to traditional methods based on neutral loss or precursor ion scanning with a triple quadrupole mass spectrometer, and clearly more efficient detection and characterization of reactive drug metabolites with a simpler test setup.
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Affiliation(s)
- Timo Rousu
- Novamass Ltd., Medipolis Center, Kiviharjuntie 11, 90220 Oulu, Finland
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27
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Jurva U, Holmén A, Grönberg G, Masimirembwa C, Weidolf L. Electrochemical Generation of Electrophilic Drug Metabolites: Characterization of Amodiaquine Quinoneimine and Cysteinyl Conjugates by MS, IR, and NMR. Chem Res Toxicol 2008; 21:928-35. [DOI: 10.1021/tx700400c] [Citation(s) in RCA: 46] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Ulrik Jurva
- AstraZeneca R&D Mölndal, S-431 83 Mölndal, Sweden
| | | | | | | | - Lars Weidolf
- AstraZeneca R&D Mölndal, S-431 83 Mölndal, Sweden
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28
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Wen B, Ma L, Nelson SD, Zhu M. High-Throughput Screening and Characterization of Reactive Metabolites Using Polarity Switching of Hybrid Triple Quadrupole Linear Ion Trap Mass Spectrometry. Anal Chem 2008; 80:1788-99. [DOI: 10.1021/ac702232r] [Citation(s) in RCA: 88] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Bo Wen
- Department of Pharmaceutical Candidate Optimization, Bristol-Myers Squibb, Princeton, New Jersey 08543, and Department of Medicinal Chemistry, University of Washington, Seattle, Washington 98195
| | - Li Ma
- Department of Pharmaceutical Candidate Optimization, Bristol-Myers Squibb, Princeton, New Jersey 08543, and Department of Medicinal Chemistry, University of Washington, Seattle, Washington 98195
| | - Sidney D. Nelson
- Department of Pharmaceutical Candidate Optimization, Bristol-Myers Squibb, Princeton, New Jersey 08543, and Department of Medicinal Chemistry, University of Washington, Seattle, Washington 98195
| | - Mingshe Zhu
- Department of Pharmaceutical Candidate Optimization, Bristol-Myers Squibb, Princeton, New Jersey 08543, and Department of Medicinal Chemistry, University of Washington, Seattle, Washington 98195
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29
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Albert BJ, Koide K. How rapidly do epoxides nonspecifically form covalent bonds with thiols in water? Chembiochem 2008; 8:1912-5. [PMID: 17907119 DOI: 10.1002/cbic.200700365] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Affiliation(s)
- Brian J Albert
- Department of Chemistry, University of Pittsburgh, 219 Parkman Avenue, Pittsburgh, PA 15260, USA
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30
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Damsten MC, Commandeur JNM, Fidder A, Hulst AG, Touw D, Noort D, Vermeulen NPE. Liquid Chromatography/Tandem Mass Spectrometry Detection of Covalent Binding of Acetaminophen to Human Serum Albumin. Drug Metab Dispos 2007; 35:1408-17. [PMID: 17510247 DOI: 10.1124/dmd.106.014233] [Citation(s) in RCA: 53] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022] Open
Abstract
Covalent binding of reactive electrophilic intermediates to proteins is considered to play an important role in the processes leading to adverse drug reactions and idiosyncratic drug reactions. Consequently, both for the discovery and the development of new drugs, there is a great interest in sensitive methodologies that enable the detection of covalent binding of drugs and drug candidates in vivo. In this work, we present a strategy for the generation and analysis of drug adducts to human serum albumin. Our methodology is based on the isolation of albumin from blood, its digestion to peptides by pronase E, and the sensitive detection of adducts to the characteristic cysteine-proline-phenylalanine (CPF) tripeptide by liquid chromatography/tandem mass spectrometry. We chose acetaminophen (APAP) as a model compound because this drug is known to induce covalent binding to proteins when bioactivated by cytochromes P450 to its reactive N-acetyl-p-benzoquinoneimine metabolite. First, by microsomal incubations of APAP in presence of CPF and/or intact albumin, in vitro reference adducts were generated to determine the mass spectrometric characteristics of the expected CPF adducts and to confirm their formation on pronase E digestion of the alkylated protein. When applying this methodology to albumin isolated from blood of patients exposed to APAP, we were indeed able to detect the corresponding CPF adducts. Therefore, this strategy could be seen as a potential biomonitoring tool to detect in vivo reactive intermediates of drugs and drug candidates, e.g., in the preclinical and clinical development phase.
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Affiliation(s)
- Micaela C Damsten
- LACDR, Division of Molecular Toxicology, Department of Pharmacochemistry, Vrije Universiteit, de Boelelaan 1083, 1081 HV Amsterdam, The Netherlands
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31
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Gómez-Lechón MJ, Castell JV, Donato MT. Hepatocytes—the choice to investigate drug metabolism and toxicity in man: In vitro variability as a reflection of in vivo. Chem Biol Interact 2007; 168:30-50. [PMID: 17134688 DOI: 10.1016/j.cbi.2006.10.013] [Citation(s) in RCA: 115] [Impact Index Per Article: 6.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/04/2006] [Revised: 10/17/2006] [Accepted: 10/27/2006] [Indexed: 12/14/2022]
Abstract
The pharmaceutical industry is committed to marketing safer drugs with fewer side effects, predictable pharmacokinetic properties and quantifiable drug-drug interactions. Drug metabolism is a major determinant of drug clearance and interindividual pharmacokinetic differences, and an indirect determinant of the clinical efficacy and toxicity of drugs. Progressive advances in the knowledge of metabolic routes and enzymes responsible for drug biotransformation have contributed to understanding the great metabolic variations existing in human beings. Phenotypic as well genotypic differences in the expression of the enzymes involved in drug metabolism are the main causes of this variability. However, only a minor part of phenotypic variability in man is attributable to gene polymorphisms, thus making the definition of a normal liver complex. At present, the use of human in vitro hepatic models at early preclinical stages means that the process of selecting drug candidates is becoming much more rational. Cultured human hepatocytes are considered to be the closest model to human liver. However, the fact that hepatocytes are located in a microenvironment that differs from that of the cell in the liver raises the question: to what extent does drug metabolism variability observed in vitro actually reflect that of the liver in vivo? By comparing the metabolism of a model compound both in vitro and in vivo in the same individual, a good correlation between the in vitro and in vivo relative abundance of oxidized metabolites and the hydrolysis of the compound was observed. Thus, it is reasonable to consider that the variability observed in human hepatocytes reflects the existing phenotypic heterogeneity of the P450 expression in human liver.
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Affiliation(s)
- María José Gómez-Lechón
- Unidad de Hepatología Experimental, Centro de Investigación, Hospital Universitario La Fe, Avda Campanar 21, 46009 Valencia, Spain.
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32
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Yengi LG, Leung L, Kao J. The Evolving Role of Drug Metabolism in Drug Discovery and Development. Pharm Res 2007; 24:842-58. [PMID: 17333392 DOI: 10.1007/s11095-006-9217-9] [Citation(s) in RCA: 51] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/10/2006] [Accepted: 12/13/2006] [Indexed: 01/16/2023]
Abstract
Drug metabolism in pharmaceutical research has traditionally focused on the well-defined aspects of absorption, distribution, metabolism and excretion, commonly-referred to ADME properties of a compound, particularly in the areas of metabolite identification, identification of drug metabolizing enzymes (DMEs) and associated metabolic pathways, and reaction mechanisms. This traditional emphasis was in part due to the limited scope of understanding and the unavailability of in vitro and in vivo tools with which to evaluate more complex properties and processes. However, advances over the past decade in separate but related fields such as pharmacogenetics, pharmacogenomics and drug transporters, have dramatically shifted the drug metabolism paradigm. For example, knowledge of the genetics and genomics of DMEs allows us to better understand and predict enzyme regulation and its effects on exogenous (pharmacokinetics) and endogenous pathways as well as biochemical processes (pharmacology). Advances in the transporter area have provided unprecedented insights into the role of transporter proteins in absorption, distribution, metabolism and excretion of drugs and their consequences with respect to clinical drug-drug and drug-endogenous substance interactions, toxicity and interindividual variability in pharmacokinetics. It is therefore essential that individuals involved in modern pharmaceutical research embrace a fully integrated approach and understanding of drug metabolism as is currently practiced. The intent of this review is to reexamine drug metabolism with respect to the traditional as well as current practices, with particular emphasis on the critical aspects of integrating chemistry and biology in the interpretation and application of metabolism data in pharmaceutical research.
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Affiliation(s)
- Lilian G Yengi
- Drug Metabolism Division, Drug Safety and Metabolism, Wyeth Research, 500 Arcola Road, Collegeville, Pennsylvania 19426, USA.
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Ma S, Subramanian R. Detecting and characterizing reactive metabolites by liquid chromatography/tandem mass spectrometry. JOURNAL OF MASS SPECTROMETRY : JMS 2006; 41:1121-39. [PMID: 16967439 DOI: 10.1002/jms.1098] [Citation(s) in RCA: 83] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/10/2023]
Abstract
Metabolic activation of a drug leading to reactive metabolite(s) that can covalently modify proteins is considered an initial step that may lead to drug-induced organ toxicities. Characterization of reactive metabolites is critical to designing new drug candidates with an improved toxicological profile. High performance liquid chromatography (HPLC) coupled with mass spectrometry (MS) predominates over all analytical tools used for screening and characterization of reactive metabolites. In this review, a brief description of experimental approaches employed for assessing reactive metabolites is followed by a discussion on the reactivity of acyl glucuronides and acyl coenzyme A thioesters. Techniques for high-throughput screening and quantitation of reactive metabolite formation are also described, along with proteomic approaches used to identify protein targets and modification sites by reactive metabolites. Strategies for dealing with reactive metabolites are reviewed. In conclusion, we discuss the challenges and future needs in this field of research.
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Affiliation(s)
- Shuguang Ma
- Pharmacokinetics and Drug Metabolism, Amgen Inc., One Amgen Center Drive, Thousand Oaks, CA 91320, USA.
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Williams DP. Toxicophores: Investigations in drug safety. Toxicology 2006; 226:1-11. [DOI: 10.1016/j.tox.2006.05.101] [Citation(s) in RCA: 53] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/16/2006] [Accepted: 05/26/2006] [Indexed: 02/03/2023]
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Yamada H, Yamaguchi JI, Iida I, Okuyama S. [Idiosyncratic drug toxicity]. Nihon Yakurigaku Zasshi 2006; 127:473-80. [PMID: 16880698 DOI: 10.1254/fpj.127.473] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/11/2023]
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Naisbitt DJ. Drug hypersensitivity reactions in skin: understanding mechanisms and the development of diagnostic and predictive tests. Toxicology 2004; 194:179-96. [PMID: 14687965 DOI: 10.1016/j.tox.2003.09.004] [Citation(s) in RCA: 43] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
Cutaneous manifestations of drug hypersensitivity can be serious and potentially life threatening and may prevent effective drug therapy. T cells play an important role in the pathology of drug hypersensitivity reactions. Classical studies suggest that T-cell activation requires drug bioactivation, covalent binding to protein and antigen processing to stimulate an immune response. Recent studies have shown that drugs can also be presented to T cells in the absence of antigen processing and drug metabolism. In this article, sulfamethoxazole is used as a paradigm to describe the chemical mechanisms involved in the initiation and maintenance of an aberrant drug antigen specific T-cell response. Presentation of the same drug to different individuals can cause a variety of skin diseases. Such reactions have been classified according to the phenotype and functionality of the T-cell response. This review summarises the different forms of cutaneous hypersensitivity reactions and describes how T-cell clones generated from hypersensitive patients have been used to study the cellular mechanisms of anticonvulsant hypersensitivity. Potential uses of in vitro cell culture assays for patient diagnosis and drug evaluation are also discussed.
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Affiliation(s)
- Dean J Naisbitt
- Department of Pharmacology, The Sherrington Building, Ashton Street, The University of Liverpool, Liverpool L69 3GE, UK.
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