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Wu D, Fu L. Recent findings and advancements in the detection of designer benzodiazepines: a brief review. Arh Hig Rada Toksikol 2023; 74:224-231. [PMID: 38146763 PMCID: PMC10750316 DOI: 10.2478/aiht-2023-74-3771] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/01/2023] [Revised: 08/01/2023] [Accepted: 11/01/2023] [Indexed: 12/27/2023] Open
Abstract
This review article takes a closer look at a new class of psychoactive substances called designer benzodiazepines (DBZs) and the challenges of their detection. These are adinazolam, clonazolam, deschloroetizolam, diclazepam, etizolam, flualprazolam, flubromazepam, flubromazolam, phenazepam, and pyrazolam. They are central nervous system depressants and sedatives that can cause psychomotor impairment and increase the overdose risk when combined with other sedatives. DBZs undergo phase I and II metabolism similar to traditional benzodiazepines, but their specific metabolic pathways and the influence of genetic polymorphisms are yet to be clarified. Advances in liquid chromatography-tandem mass spectrometry (LC-MS/MS) have enhanced the method's sensitivity for DBZs and their metabolites in biological samples and coupled with improved blood sampling methods require less blood for drug monitoring. Further research should focus on elucidating their pharmacokinetic properties and metabolism in humans, especially in view of genetic polymorphisms and drug interactions that could inform clinical treatment choices. Even though we have witnessed important advances in DBZ detection and measurement, further refinements are needed to expand the scope of detectable DBZs and their metabolites. All this should help toxicological research to better identify and characterise the risks of chronic and polydrug abuse and facilitate clinical, forensic, and regulatory responses to this growing issue.
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Affiliation(s)
- Dihua Wu
- Hangzhou Dianzi University College of Materials and Environmental Engineering, Hangzhou, China
| | - Li Fu
- Hangzhou Dianzi University College of Materials and Environmental Engineering, Hangzhou, China
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2
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Wu S, Daston G, Rose J, Blackburn K, Fisher J, Reis A, Selman B, Naciff J. Identifying chemicals based on receptor binding/bioactivation/mechanistic explanation associated with potential to elicit hepatotoxicity and to support structure activity relationship-based read-across. Curr Res Toxicol 2023; 5:100108. [PMID: 37363741 PMCID: PMC10285556 DOI: 10.1016/j.crtox.2023.100108] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/24/2023] [Revised: 06/02/2023] [Accepted: 06/06/2023] [Indexed: 06/28/2023] Open
Abstract
The liver is the most common target organ in toxicology studies. The development of chemical structural alerts for identifying hepatotoxicity will play an important role in in silico model prediction and help strengthen the identification of analogs used in structure activity relationship (SAR)- based read-across. The aim of the current study is development of an SAR-based expert-system decision tree for screening of hepatotoxicants across a wide range of chemistry space and proposed modes of action for clustering of chemicals using defined core chemical categories based on receptor-binding or bioactivation. The decision tree is based on ∼ 1180 different chemicals that were reviewed for hepatotoxicity information. Knowledge of chemical receptor binding, metabolism and mechanistic information were used to group these chemicals into 16 different categories and 102 subcategories: four categories describe binders to 9 different receptors, 11 categories are associated with possible reactive metabolites (RMs) and there is one miscellaneous category. Each chemical subcategory has been associated with possible modes of action (MOAs) or similar key structural features. This decision tree can help to screen potential liver toxicants associated with core structural alerts of receptor binding and/or RMs and be used as a component of weight of evidence decisions based on SAR read-across, and to fill data gaps.
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3
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Tani N, Ikeda T, Ishikawa T. Relationship between clock gene expression and CYP2C19 and CYP3A4 with benzodiazepines. Hum Exp Toxicol 2023; 42:9603271231171643. [PMID: 37072025 DOI: 10.1177/09603271231171643] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 04/20/2023]
Abstract
The present study aimed to clarify the expressions and roles of clock genes involved in drug metabolism in patients taking benzodiazepines (BZDs), as well as the drug metabolism regulators controlled by clock genes for each BZD type. The relationships between the expressions of the clock genes BMAL1, PER2, and DBP and the drug-metabolizing enzymes CYP3A4 and CYP2C19 were investigated using livers from BZD-detected autopsy cases. In addition, the effect of BZD exposure on various genes was examined in HepG2 human hepatocellular carcinoma cells. The expressions of DBP, CYP3A4, and CYP2C19 in the liver were lower in the diazepam-detected group than in the non-detected group. Furthermore, BMAL1 expression correlated with CYP2C19 expression. Cell culture experiments showed that the expressions of DBP and CYP3A4 decreased, whereas those of BMAL1 and CYP2C19 increased after diazepam and midazolam exposure. The results of the analyses of autopsy samples and cultured cells suggested that DBP regulates CYP3A4 when exposed to BZD. Understanding the relationship between these clock genes and CYPs may help achieve individualized drug therapy.
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Affiliation(s)
- Naoto Tani
- Department of Legal Medicine, Graduate School of Medicine, Osaka Metropolitan University, Abeno, Osaka, Japan
- Forensic Autopsy Section, Medico-legal Consultation and Postmortem Investigation Support Center, C/O Department of Legal Medicine, Graduate School of Medicine, Osaka Metropolitan University, Abeno, Osaka, Japan
| | - Tomoya Ikeda
- Department of Legal Medicine, Graduate School of Medicine, Osaka Metropolitan University, Abeno, Osaka, Japan
- Forensic Autopsy Section, Medico-legal Consultation and Postmortem Investigation Support Center, C/O Department of Legal Medicine, Graduate School of Medicine, Osaka Metropolitan University, Abeno, Osaka, Japan
| | - Takaki Ishikawa
- Department of Legal Medicine, Graduate School of Medicine, Osaka Metropolitan University, Abeno, Osaka, Japan
- Forensic Autopsy Section, Medico-legal Consultation and Postmortem Investigation Support Center, C/O Department of Legal Medicine, Graduate School of Medicine, Osaka Metropolitan University, Abeno, Osaka, Japan
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4
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Hashida H, Kurawaka M, Tatehana H, Arita A, Sasaki N, Shimura F, Yamazaki Y. Application to Butterbur Products of a Suggested Daily Intake-Based Safety Evaluation of Individual Herbal Supplements with Cytochrome P450 Expression as a Major Index. J Nutr Sci Vitaminol (Tokyo) 2023; 69:206-219. [PMID: 37394426 DOI: 10.3177/jnsv.69.206] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 07/04/2023]
Abstract
The present paper first proposes a method for ensuring the safety of commercial herbal supplements, termed the suggested daily intake-based safety evaluation (SDI-based safety evaluation). This new method was inspired as a backward analog of the acceptable daily intake (ADI) derivation from the no observed adverse effect level (NOAEL), the basis of food additive risk analysis; namely, rats are dosed with individual herbal supplement products at the SDI for human use multiplied by 100 (the usual uncertainty factor value) per body weight for 8 d. The primary endpoint is the sign of adverse effects on liver, especially gene expression of cytochrome P450 (CYP) isoforms. The proposed method was then applied to three butterbur (Petasites hybridus) products without pyrrolizidine alkaloids but lacking clear safety information. Results showed that two oily products markedly enhanced the mRNA expression of CYP2B (>10-fold) and moderately enhanced that of CYP3A1 (<4-fold) with liver enlargement. These products also caused the renal accumulation of alpha 2-microglobulin. One powdery product showed no significant effect on liver and kidney. The large difference in effects of products was due to the difference in chemical composition revealed by liquid chromatography-mass spectroscopy. The oily and the powdery products required attention in terms of safety and effectiveness, respectively. Finally, the results from the SDI-based safety evaluation of butterbur and other herbal supplement products were grouped into four categories and cautionary notes were discussed. The SDI-based safety evaluation of their products by herbal supplement operators would contribute to safe and secure use by consumers.
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Affiliation(s)
- Hiroko Hashida
- Department of Food and Nutritional Sciences, Graduate School of Human Life Sciences, Jumonji University Graduate School
| | - Misaki Kurawaka
- Department of Food and Nutritional Sciences, Graduate School of Human Life Sciences, Jumonji University Graduate School
| | - Haruka Tatehana
- Department of Food and Nutritional Sciences, Graduate School of Human Life Sciences, Jumonji University Graduate School
| | - Anna Arita
- Department of Health and Nutrition, Faculty of Human Life, Jumonji University
| | - Naho Sasaki
- Department of Health and Nutrition, Faculty of Human Life, Jumonji University
| | - Fumio Shimura
- Department of Food and Nutritional Sciences, Graduate School of Human Life Sciences, Jumonji University Graduate School
| | - Yuko Yamazaki
- Department of Food and Nutrition, Faculty of Human Life, Jumonji University
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5
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Theoretical study of nimetazepam, a real-life chiral molecule without an asymmetric carbon atom. J Mol Struct 2022. [DOI: 10.1016/j.molstruc.2022.132720] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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6
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Golovenko M. METABOLIC PROFILE AND MECHANISMS OF GABA-TARGETED RECEPTOR PROPOXAZEPAM METABOLIZATION IN HUMAN HEPATOCYTES. BIOTECHNOLOGIA ACTA 2022. [DOI: 10.15407/biotech15.01.043] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022] Open
Abstract
The aim of this study was to identify the Propoxazepam metabolites, formed by suspension of cryopreserved human hepatocytes, using the precise method of mass LC-MS/MS analysis. Methods. A suitable chromatographic method was developed for the profiling of Propoxazepam and its metabolites. Samples were analyzed using a Waters Vion high resolution LC-MS/MS instrument, and data were examined using Waters Unifi software to determine the identity of the most abundant metabolites. Following a 4-hour incubation with human hepatocytes, intact Propoxazepam molecule accounted for 96.0% of the profile. Its most abundant metabolite was the oxidize. Results. Propoxazepam (3-hydroxyderivative), which accounted for approximately 2.5% of the total peak response in the 4-hour sample. Two minor components were also found, each accounting for < 10% of the total peak response. Glucuronic conjugates have not been found under the experimental conditions. All metabolites formed represented less than 10% of the total chromatographic peak response. Coclusion. The data obtained indicate the absence of reactive electrophilic derivatives among the metabolites of Propoxazepam.
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Suroowan S, Abdallah HH, Mahomoodally MF. Herb-drug interactions and toxicity: Underscoring potential mechanisms and forecasting clinically relevant interactions induced by common phytoconstituents via data mining and computational approaches. Food Chem Toxicol 2021; 156:112432. [PMID: 34293424 DOI: 10.1016/j.fct.2021.112432] [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: 03/17/2021] [Revised: 06/28/2021] [Accepted: 07/17/2021] [Indexed: 01/05/2023]
Abstract
Herbals in the form of medicine are employed extensively around the world. Herbal and conventional medicine combination is a potentially dangerous practice mainly in comorbid, hepato insufficient and frail patients leading to perilous herb-drug interactions (HDI) and toxicity. This study features potential HDI of 15 globally famous plant species through data mining and computational methods. Several plant species were found to mimic warfarin. Phytochemicals from M. charantia induced hypoglycemica. M. chamomila and G. biloba possessed anticoagulant activities. S. hispanica reduces postprandial glycemia. R. officinalis has been reported to inhibit the efflux of anticancer substrates while A. sativum can boost the clearance of anticancer agents. P. ginseng can alter blood coagulation. A cross link of the biological and in silico data revealed that a plethora of herbal metabolites such as ursolic and rosmarinic acid among others are possible/probable inhibitors of specific CYP450 enzymes. Consequently, plant species/metabolites with a given pharmacological property/metabolizing enzyme should not be mixed with drugs having the same pharmacological property/metabolizing enzyme. Even if combined with drugs, herbal medicines must be used at low doses for a short period of time and under the supervision of a healthcare professional to avoid potential adverse and toxic effects.
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Affiliation(s)
- Shanoo Suroowan
- Department of Health Sciences, Faculty of Medicine and Health Sciences, University of Mauritius, Réduit, Mauritius
| | - Hassan Hadi Abdallah
- Department of Chemistry, College of Education, Salahaddin University-Erbil, Erbīl, Iraq
| | - Mohamad Fawzi Mahomoodally
- Department of Health Sciences, Faculty of Medicine and Health Sciences, University of Mauritius, Réduit, Mauritius.
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8
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Utility of Three-Dimensional Cultures of Primary Human Hepatocytes (Spheroids) as Pharmacokinetic Models. Biomedicines 2020; 8:biomedicines8100374. [PMID: 32977664 PMCID: PMC7598599 DOI: 10.3390/biomedicines8100374] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/11/2020] [Revised: 09/18/2020] [Accepted: 09/21/2020] [Indexed: 12/13/2022] Open
Abstract
This paper reviews the usefulness, current status, and potential of primary human hepatocytes (PHHs) in three-dimensional (3D) cultures, also known as spheroids, in the field of pharmacokinetics (PK). Predicting PK and toxicity means pharmaceutical research can be conducted more efficiently. Various in vitro test systems using human hepatocytes have been proposed as tools to detect hepatic toxicity at an early stage in the drug development process. However, such evaluation requires long-term, low-level exposure to the test compound, and conventional screening systems such as PHHs in planar (2D) culture, in which the cells can only survive for a few days, are unsuitable for this purpose. In contrast, spheroids consisting of PHH are reported to retain the functional characteristics of human liver for at least 35 days. Here, we introduce a fundamental PK and toxicity assessment model of PHH spheroids and describe their applications for assessing species-specific metabolism, enzyme induction, and toxicity, focusing on our own work in these areas. The studies outlined in this paper may provide important information for pharmaceutical companies to reduce termination of development of drug candidates.
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9
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Mizoi K, Fukai Y, Matsumoto E, Koyama S, Ishida S, Kojima H, Ogihara T. Usefulness and limitations of mRNA measurement in HepaRG cells for evaluation of cytochrome P450 induction. ACTA ACUST UNITED AC 2020. [DOI: 10.2131/fts.7.9] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/02/2022]
Affiliation(s)
- Kenta Mizoi
- Faculty of Pharmacy, Takasaki University of Health and Welfare
| | - Yuuki Fukai
- Faculty of Pharmacy, Takasaki University of Health and Welfare
| | - Eiko Matsumoto
- Faculty of Pharmacy, Takasaki University of Health and Welfare
| | - Satoshi Koyama
- Faculty of Pharmacy, Takasaki University of Health and Welfare
- RIKEN Cluster for Science, Technology and Innovation Hub
| | - Seiichi Ishida
- Biological Safety Research Center, National Institute of Health Sciences
| | - Hajime Kojima
- Biological Safety Research Center, National Institute of Health Sciences
| | - Takuo Ogihara
- Faculty of Pharmacy, Takasaki University of Health and Welfare
- Graduate School of Pharmaceutical Sciences, Takasaki University of Health and Welfare
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10
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Abstract
Over the years, numerous studies have supported the premise that individuals possessing the "slow acetylator" phenotype are more at risk from developing drug side-effects. Most prominent amongst these reports are those concerned with hepatotoxicity and peripheral neuropathy following treatment with isoniazid, lupus-like symptoms during procainamide therapy and experiencing hypersensitivity reactions to the various sulphonamide derivatives. Similarly, "slow acetylators" undergoing heavy exposure to arylamines and related carcinogens are more likely to develop bladder cancer. Contrariwise, there appears a slight risk of "rapid acetylators" developing pancreatic tumours.Other therapeutic agents for which polymorphic N-acetylation plays a minor role in their metabolism have been investigated but any impact of this metabolic difference on clinical efficacy or associated toxicity is still under question. In the search for clues as to the underlying aetiology, patient groups with many disease states have been examined for association with differences in N-acetylation and the majority have provided data that could be interpreted as equivocal. Studies have given contradictory, often opposing, results, calculated risk factors that are (perhaps) just significant but certainly not high, and patients within the cohorts who are always exceptions. Undoubtedly, other as yet unappreciated factors are at play.
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Affiliation(s)
- Stephen C Mitchell
- Section of Computational and Systems Medicine, Faculty of Medicine, Imperial College London, London, UK
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11
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Tam C, Wong JH, Ng TB, Tsui SKW, Zuo T. Drugs for Targeted Therapies of Alzheimer's Disease. Curr Med Chem 2019; 26:335-359. [PMID: 29714133 DOI: 10.2174/0929867325666180430150940] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/03/2017] [Revised: 01/01/2018] [Accepted: 04/24/2018] [Indexed: 01/10/2023]
Abstract
Alzheimer's disease (AD) is one type of neurodegenerative diseases, which is prevalent in the elderly. Beta-amyloid (Aβ) plaques and phosphorylated tau-induced neurofibrillary tangles are two pathological hallmarks of this disease and the corresponding pathological pathways of these hallmarks are considered as the therapeutic targets. There are many drugs scheduled for pre-clinical and clinical trial that target to inhibit the initiators of pathological Aβ and tau aggregates as well as critical Aβ secretases and kinases in tau hyperphosphorylation. In addition, studies in disease gene variations, and detection of key prognostic effectors in early development are also important for AD control. The discovery of potential drug targets contributed to targeted therapy in a stage-dependent manner, However, there are still some issues that cause concern such as the low bioavailability and low efficacy of candidate drugs from clinical trial reports. Therefore, modification of drug candidates and development of delivery agents are essential and critical. With other medical advancements like cell replacement therapy, there is hope for the cure of Alzheimer's disease in the foreseeable future.
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Affiliation(s)
- Chit Tam
- School of Biomedical Sciences, Faculty of Medicine, The Chinese University of Hong Kong, Shatin, New Territories, Hong Kong, China
| | - Jack Ho Wong
- School of Biomedical Sciences, Faculty of Medicine, The Chinese University of Hong Kong, Shatin, New Territories, Hong Kong, China
| | - Tzi Bun Ng
- School of Biomedical Sciences, Faculty of Medicine, The Chinese University of Hong Kong, Shatin, New Territories, Hong Kong, China
| | - Stephen Kwok Wing Tsui
- School of Biomedical Sciences, Faculty of Medicine, The Chinese University of Hong Kong, Shatin, New Territories, Hong Kong, China
| | - Tao Zuo
- Department of Medicine and Therapeutics, Faculty of Medicine, The Chinese University of Hong Kong, Shatin, New Territories, Hong Kong, China
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12
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Lim SYM, Binti Azidin AR, Ung YT, Al-Shagga M, Alshawsh MA, Mohamed Z, Ong CE, Pan Y. Effect of 95% Ethanol Khat Extract and Cathinone on in vitro Human Recombinant Cytochrome P450 (CYP) 2C9, CYP2D6, and CYP3A4 Activity. Eur J Drug Metab Pharmacokinet 2018; 44:423-431. [DOI: 10.1007/s13318-018-0518-2] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/02/2023]
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13
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Erukainure OL, Narainpersad N, Singh M, Olakunle S, Islam MS. Clerodendrum volubile inhibits key enzymes linked to type 2 diabetes but induces cytotoxicity in human embryonic kidney (HEK293) cells via exacerbated oxidative stress and proinflammation. Biomed Pharmacother 2018; 106:1144-1152. [PMID: 30119181 DOI: 10.1016/j.biopha.2018.07.013] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/15/2018] [Revised: 06/29/2018] [Accepted: 07/01/2018] [Indexed: 12/12/2022] Open
Abstract
The toxicity and safety associated with the use of medicinal plants remains a major concern. In this study, the antidiabetic properties of the dichloromethane (DCM) fraction of C. volubile leaves were investigated in vitro. Its cytotoxic effect and mechanism of toxicity were also investigated in Human Embryonic Kidney (HEK293) cells. The fraction was subjected to in vitro antioxidant assays using the 2,2'-diphenyl-1-picrylhydrazyl (DPPH) scavenging and Ferric reducing antioxidant power (FRAP) protocols. Its enzyme-inhibitory properties were investigated on α-glucosidase and α-amylase activities. Gas Chromatography Mass Spectroscopy (GCMS) and Fourier Transform Infrared (FTIR) spectroscopic analysis were used to identify its phytoconstituents. Cytotoxicity was determined via MTT assay. The treated cells were assayed for reduced glutathione (GSH), non-protein thiol, nitric oxide and malondialdehyde (MDA) levels, as well as Superoxide Dismutase (SOD), catalase, myeloperoxidase and ATPase activities. Cell apoptosis and/or morphological changes were determined using the acridine orange and ethidium bromide (AO/EB) dual staining method. The fraction showed significant (p < 0.05) antioxidant and enzyme-inhibitory activity. It showed significant (p < 0.05) cytotoxic effect against HEK293 cells with concomitant depletion of antioxidative and elevation of proinflammatory biomarkers. Morphological changes were examined in the cells with an apoptotic index of 0.84. 1,1-Dodecanediol, diacetate was identified as the most predominant compound, while aromatics and amines as the most functional groups present in the fraction. These results suggest the antidiabetic and cytotoxic effects of C. volubile leaves. The toxicity can be attributed to induced oxidative stress and proinflammation with concomitant depletion of ATP leading to apoptosis of the cells.
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Affiliation(s)
- Ochuko L Erukainure
- Department of Biochemistry, School of Life Sciences, University of KwaZulu-Natal, Westville Campus, Durban 4000, South Africa; Nutrition and Toxicology Division, Federal Institute of Industrial Research, Lagos, Nigeria
| | - Nicholisha Narainpersad
- Department of Biochemistry, School of Life Sciences, University of KwaZulu-Natal, Westville Campus, Durban 4000, South Africa
| | - Moganavelli Singh
- Department of Biochemistry, School of Life Sciences, University of KwaZulu-Natal, Westville Campus, Durban 4000, South Africa
| | - Sanni Olakunle
- Department of Biochemistry, School of Life Sciences, University of KwaZulu-Natal, Westville Campus, Durban 4000, South Africa
| | - Md Shahidul Islam
- Department of Biochemistry, School of Life Sciences, University of KwaZulu-Natal, Westville Campus, Durban 4000, South Africa.
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14
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Rana M, Dash AK, Ponnusamy K, Tyagi RK. Nuclear localization signal region in nuclear receptor PXR governs the receptor association with mitotic chromatin. Chromosome Res 2018; 26:255-276. [DOI: 10.1007/s10577-018-9583-2] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/27/2018] [Revised: 06/28/2018] [Accepted: 07/02/2018] [Indexed: 12/17/2022]
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15
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Prediction of liver toxicity and mode of action using metabolomics in vitro in HepG2 cells. Arch Toxicol 2017; 92:893-906. [PMID: 28965233 PMCID: PMC5818600 DOI: 10.1007/s00204-017-2079-6] [Citation(s) in RCA: 98] [Impact Index Per Article: 14.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/04/2017] [Accepted: 09/21/2017] [Indexed: 11/17/2022]
Abstract
Liver toxicity is a leading systemic toxicity of drugs and chemicals demanding more human-relevant, high throughput, cost effective in vitro solutions. In addition to contributing to animal welfare, in vitro techniques facilitate exploring and understanding the molecular mechanisms underlying toxicity. New ‘omics technologies can provide comprehensive information on the toxicological mode of action of compounds, as well as quantitative information about the multi-parametric metabolic response of cellular systems in normal and patho-physiological conditions. Here, we combined mass-spectroscopy metabolomics with an in vitro liver toxicity model. Metabolite profiles of HepG2 cells treated with 35 test substances resulted in 1114 cell supernatants and 3556 intracellular samples analyzed by metabolomics. Control samples showed relative standard deviations of about 10–15%, while the technical replicates were at 5–10%. Importantly, this procedure revealed concentration–response effects and patterns of metabolome changes that are consistent for different liver toxicity mechanisms (liver enzyme induction/inhibition, liver toxicity and peroxisome proliferation). Our findings provide evidence that identifying organ toxicity can be achieved in a robust, reliable, human-relevant system, representing a non-animal alternative for systemic toxicology.
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16
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Soleymani S, Bahramsoltani R, Rahimi R, Abdollahi M. Clinical risks of St John’s Wort (Hypericum perforatum) co-administration. Expert Opin Drug Metab Toxicol 2017; 13:1047-1062. [DOI: 10.1080/17425255.2017.1378342] [Citation(s) in RCA: 41] [Impact Index Per Article: 5.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
Affiliation(s)
- Samaneh Soleymani
- Department of Traditional Pharmacy, School of Traditional Medicine, Tehran University of Medical Sciences, Tehran, Iran
| | - Roodabeh Bahramsoltani
- Department of Traditional Pharmacy, School of Traditional Medicine, Tehran University of Medical Sciences, Tehran, Iran
- PhytoPharmacology Interest Group (PPIG), Universal Scientific Education and Research Network (USERN), Tehran, Iran
| | - Roja Rahimi
- Department of Traditional Pharmacy, School of Traditional Medicine, Tehran University of Medical Sciences, Tehran, Iran
- Evidence-Based Medicine Group, Pharmaceutical Sciences Research Center, Tehran University of Medical Sciences, Tehran, Iran
| | - Mohammad Abdollahi
- Toxicology and Diseases Group, Pharmaceutical Sciences Research Center, Tehran University of Medical Sciences, Tehran, Iran
- Department of Toxicology and Pharmacology, Faculty of Pharmacy, Tehran University of Medical Sciences, Tehran, Iran
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17
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Identification of enzymes responsible for nitrazepam metabolism and toxicity in human. Biochem Pharmacol 2017; 140:150-160. [DOI: 10.1016/j.bcp.2017.06.114] [Citation(s) in RCA: 22] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/14/2017] [Accepted: 06/07/2017] [Indexed: 12/16/2022]
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18
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Manchester KR, Lomas EC, Waters L, Dempsey FC, Maskell PD. The emergence of new psychoactive substance (NPS) benzodiazepines: A review. Drug Test Anal 2017; 10:37-53. [DOI: 10.1002/dta.2211] [Citation(s) in RCA: 63] [Impact Index Per Article: 9.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/13/2017] [Revised: 04/11/2017] [Accepted: 04/26/2017] [Indexed: 01/17/2023]
Affiliation(s)
- Kieran R. Manchester
- School of Applied Sciences, Queensgate Campus; University of Huddersfield; Huddersfield UK
| | - Emma C. Lomas
- School of Applied Sciences, Queensgate Campus; University of Huddersfield; Huddersfield UK
| | - Laura Waters
- School of Applied Sciences, Queensgate Campus; University of Huddersfield; Huddersfield UK
| | - Fiona C. Dempsey
- MedAnnex Ltd, 1 Summerhall Place; Techcube 3.5; Edinburgh EH9 1PL UK
| | - Peter D. Maskell
- School of Science, Engineering and Technology; Abertay University; Dundee UK
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19
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Singh A, Zhao K. Herb-Drug Interactions of Commonly Used Chinese Medicinal Herbs. INTERNATIONAL REVIEW OF NEUROBIOLOGY 2017; 135:197-232. [PMID: 28807159 DOI: 10.1016/bs.irn.2017.02.010] [Citation(s) in RCA: 35] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Abstract
With more and more popular use of traditional herbal medicines, in particular Chinese herbal medicines, herb-drug interactions have become a more and more important safety issue in the clinical applications of the conventional drugs. Researches in this area are increasing very rapidly. Herb-drug interactions are complicated due to the fact that multiple chemical components are involved, and these compounds may possess diverse pharmacological activities. Interactions can be in both pharmacokinetics and pharmacodynamics. Abundant studies focused on pharmacokinetic interactions of herbs and drugs. Herbs may affect the behavior of the concomitantly used drugs by changing their absorption, distribution, metabolism, and excretion. Studies on pharmacodynamics interactions of herbs and drugs are still very limited. Herb-drug interactions are potentially causing changes in drug levels and drug activities and leading to either therapeutic failure or toxicities. Sometime it can be fatal. The exposures to drugs, lacking of knowledge in the potential adverse herb-drug interactions, will put big risk to patients' safety in medical services. On the contrary, some interactions may be therapeutically beneficial. It may be used to help develop new therapeutic strategies in the future. This chapter is trying to review the development in the area of herb-drug interactions based on the recently published research findings. Information on the potential interactions among the commonly used Chinese medicinal herbs and conventional drugs is summarized in this chapter.
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Affiliation(s)
- Amrinder Singh
- Traditional Chinese Herbal Medicine Programme, Middlesex University, The Borough, Hendon, London, United Kingdom
| | - Kaicun Zhao
- Traditional Chinese Herbal Medicine Programme, Middlesex University, The Borough, Hendon, London, United Kingdom.
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Jian YS, Chen CW, Lin CA, Yu HP, Lin HY, Liao MY, Wu SH, Lin YF, Lai PS. Hyaluronic acid-nimesulide conjugates as anticancer drugs against CD44-overexpressing HT-29 colorectal cancer in vitro and in vivo. Int J Nanomedicine 2017; 12:2315-2333. [PMID: 28392690 PMCID: PMC5376212 DOI: 10.2147/ijn.s120847] [Citation(s) in RCA: 31] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022] Open
Abstract
Carrier-mediated drug delivery systems are promising therapeutics for targeted delivery and improved efficacy and safety of potent cytotoxic drugs. Nimesulide is a multifactorial cyclooxygenase 2 nonsteroidal anti-inflammatory drug with analgesic, antipyretic and potent anticancer properties; however, the low solubility of nimesulide limits its applications. Drugs conjugated with hyaluronic acid (HA) are innovative carrier-mediated drug delivery systems characterized by CD44-mediated endocytosis of HA and intracellular drug release. In this study, hydrophobic nimesulide was conjugated to HA of two different molecular weights (360 kDa as HA with high molecular weight [HAH] and 43kDa as HA with low molecular weight [HAL]) to improve its tumor-targeting ability and hydrophilicity. Our results showed that hydrogenated nimesulide (N-[4-amino-2-phenoxyphenyl]methanesulfonamide) was successfully conjugated with both HA types by carbodiimide coupling and the degree of substitution of nimesulide was 1%, which was characterized by 1H nuclear magnetic resonance 400 MHz and total correlation spectroscopy. Both Alexa Fluor® 647 labeled HAH and HAL could selectively accumulate in CD44-overexpressing HT-29 colorectal tumor area in vivo, as observed by in vivo imaging system. In the in vitro cytotoxic test, HA-nimesulide conjugate displayed >46% cell killing ability at a nimesulide concentration of 400 µM in HT-29 cells, whereas exiguous cytotoxic effects were observed on HCT-15 cells, indicating that HA-nimesulide causes cell death in CD44-overexpressing HT-29 cells. Regarding in vivo antitumor study, both HAL-nimesulide and HAH-nimesulide caused rapid tumor shrinkage within 3 days and successfully inhibited tumor growth, which reached 82.3% and 76.4% at day 24 through apoptotic mechanism in HT-29 xenografted mice, without noticeable morphologic differences in the liver or kidney, respectively. These results indicated that HA-nimesulide with improved selectivity through HA/CD44 receptor interactions has the potential to enhance the therapeutic efficacy and safety of nimesulide for cancer treatment.
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Affiliation(s)
| | | | - Chih-An Lin
- PhD Program in Tissue Engineering and Regenerative Medicine, National Chung Hsing University, Taichung
| | | | - Hua-Yang Lin
- Preclinical Development Research Department, Holy Stone Healthcare Co., Ltd., Taipei
| | | | | | | | - Ping-Shan Lai
- Department of Chemistry; PhD Program in Tissue Engineering and Regenerative Medicine, National Chung Hsing University, Taichung; Research Center for Sustainable Energy and Nanotechnology; Rong Hsing Research Center for Translational Medicine, National Chung Hsing University, Taichung, Taiwan
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Noble C, Mardal M, Bjerre Holm N, Stybe Johansen S, Linnet K. In vitro studies on flubromazolam metabolism and detection of its metabolites in authentic forensic samples. Drug Test Anal 2017; 9:1182-1191. [PMID: 27935260 DOI: 10.1002/dta.2146] [Citation(s) in RCA: 32] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/21/2016] [Revised: 11/29/2016] [Accepted: 11/30/2016] [Indexed: 11/10/2022]
Abstract
Flubromazolam is a triazole benzodiazepine with high potency and long-lasting central nervous system depressant effects; however, limited data about its pharmacokinetics are available. Here, we report in vitro studies of the human flubromazolam metabolism analyzed by liquid chromatography high-resolution mass spectrometry (LC-HRMS). In vitro investigations were carried out in pooled human liver microsomes (pHLM) and recombinant cytochrome P450 (CYP)-enzymes. To confirm those metabolites detected in vitro, authentic samples obtained from two forensic cases were also analyzed by LC-HRMS. Additionally, determination of the unbound fraction of flubromazolam in pHLM and in plasma was performed by equilibrium dialysis with subsequent prediction of its hepatic clearance (CLH ) using well-stirred and parallel-tube models. Additional findings obtained by routine screening methods of these forensic cases are also reported. Studies using incubations with nicotinamide adenine dinucleotide phosphate-fortified pHLM with or without uridine 5'-diphosphoglucuronic acid and incubations with CYP-enzymes identified the main metabolic pathway of flubromazolam as hydroxylation on the α- and/or 4-position mediated by CYP3A4 and CYP3A5, with subsequent glucuronidation of the hydroxylated metabolites as well as of the parent drug. Further, α-hydroxy-flubromazolam and its corresponding glucuronide were detected in vivo together with the N-glucuronide of flubromazolam. The predicted CLH of flubromazolam using the well-stirred and parallel-tube models were 0.42 and 0.43 mL/min/kg, respectively. Based on the data presented here, flubromazolam is primarily metabolized by CYP3A4/5 with a high protein-binding and a predicted low clearance. Analysis of authentic samples suggested that analytical targets for flubromazolam should be the compound itself and α-hydroxy-flubromazolam. Copyright © 2016 John Wiley & Sons, Ltd.
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Affiliation(s)
- Carolina Noble
- Section of Forensic Chemistry, Department of Forensic Medicine, Faculty of Health and Medical Sciences, University of Copenhagen, Frederik V's Vej 11, 3, DK-2100, Denmark
| | - Marie Mardal
- Section of Forensic Chemistry, Department of Forensic Medicine, Faculty of Health and Medical Sciences, University of Copenhagen, Frederik V's Vej 11, 3, DK-2100, Denmark
| | - Niels Bjerre Holm
- Section of Forensic Chemistry, Department of Forensic Medicine, Faculty of Health and Medical Sciences, University of Copenhagen, Frederik V's Vej 11, 3, DK-2100, Denmark
| | - Sys Stybe Johansen
- Section of Forensic Chemistry, Department of Forensic Medicine, Faculty of Health and Medical Sciences, University of Copenhagen, Frederik V's Vej 11, 3, DK-2100, Denmark
| | - Kristian Linnet
- Section of Forensic Chemistry, Department of Forensic Medicine, Faculty of Health and Medical Sciences, University of Copenhagen, Frederik V's Vej 11, 3, DK-2100, Denmark
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Rana M, Devi S, Gourinath S, Goswami R, Tyagi RK. A comprehensive analysis and functional characterization of naturally occurring non-synonymous variants of nuclear receptor PXR. BIOCHIMICA ET BIOPHYSICA ACTA-GENE REGULATORY MECHANISMS 2016; 1859:1183-1197. [PMID: 26962022 DOI: 10.1016/j.bbagrm.2016.03.001] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/31/2015] [Revised: 02/29/2016] [Accepted: 03/01/2016] [Indexed: 01/17/2023]
Abstract
Pregnane & Xenobiotic Receptor (PXR) acts as a xenosensing transcriptional regulator of many drug metabolizing enzymes and transporters of the 'detoxification machinery' that coordinate in elimination of xenobiotics and endobiotics from the cellular milieu. It is an accepted view that some individuals or specific populations display considerable differences in their ability to metabolize different drugs, dietary constituents, herbals etc. In this context we speculated that polymorphisms in PXR gene might contribute to variability in cytochrome P450 (CYP450) metabolizing enzymes of phase I, drug metabolizing components of phase II and efflux components of the detoxification machinery. Therefore, in this study, we have undertaken a comprehensive functional analysis of seventeen naturally occurring non-synonymous variants of human PXR. When compared, we observed that some of the PXR SNP variants exhibit distinct functional and dynamic responses on parameters which included transcriptional function, sub-cellular localization, mitotic chromatin binding, DNA-binding properties and other molecular interactions. One of the unique SNP located within the DNA-binding domain of PXR was found to be functionally null and distinct on other parameters. Similarly, some of the non-synonymous SNPs in PXR imparted reduced transactivation function as compared to wild type PXR. Interestingly, PXR is reported to be a mitotic chromatin binding protein and such an association has been correlated to an emerging concept of 'transcription memory' and altered transcription output. In view of the observations made herein our data suggest that some of the natural PXR variants may have adverse physiological consequences owing to its influence on the expression levels and functional output of drug-metabolizing enzymes and transporters. The present study is expected to explain not only the observed inter-individual responses to different drugs but may also highlight the mechanistic details and importance of PXR in drug clearance, drug-drug interactions and diverse metabolic disorders. This article is part of a Special Issue entitled: Xenobiotic nuclear receptors: New Tricks for An Old Dog, edited by Dr. Wen Xie.
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Affiliation(s)
- Manjul Rana
- Special Centre for Molecular Medicine, Jawaharlal Nehru University, New Delhi 110067, India
| | - Suneeta Devi
- School of Life-Sciences, Jawaharlal Nehru University, New Delhi 110067, India
| | - Samudrala Gourinath
- School of Life-Sciences, Jawaharlal Nehru University, New Delhi 110067, India
| | - Ravinder Goswami
- Department of Endocrinology and Metabolism, All India Institute of Medical Sciences, New Delhi 110029, India
| | - Rakesh K Tyagi
- Special Centre for Molecular Medicine, Jawaharlal Nehru University, New Delhi 110067, India.
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Badri PS, King JR, Polepally AR, McGovern BH, Dutta S, Menon RM. Dosing Recommendations for Concomitant Medications During 3D Anti-HCV Therapy. Clin Pharmacokinet 2016; 55:275-95. [PMID: 26330025 PMCID: PMC4761011 DOI: 10.1007/s40262-015-0317-8] [Citation(s) in RCA: 25] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/08/2023]
Abstract
The development of direct-acting antiviral (DAA) agents has reinvigorated the treatment of hepatitis C virus infection. The availability of multiple DAA agents and drug combinations has enabled the transition to interferon-free therapy that is applicable to a broad range of patients. However, these DAA combinations are not without drug-drug interactions (DDIs). As every possible DDI permutation cannot be evaluated in a clinical study, guidance is needed for healthcare providers to avoid or minimize drug interaction risk. In this review, we evaluated the DDI potential of the novel three-DAA combination of ombitasvir, paritaprevir, ritonavir, and dasabuvir (the 3D regimen) with more than 200 drugs representing 19 therapeutic drug classes. Outcomes of these DDI studies were compared with the metabolism and elimination routes of prospective concomitant medications to develop mechanism-based and drug-specific guidance on interaction potential. This analysis revealed that the 3D regimen is compatible with many of the drugs that are commonly prescribed to patients with hepatitis C virus infection. Where interaction is possible, risk can be mitigated by paying careful attention to concomitant medications, adjusting drug dosage as needed, and monitoring patient response and/or clinical parameters.
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Affiliation(s)
- Prajakta S Badri
- Clinical Pharmacology and Pharmacometrics (R4PK), AbbVie, Inc., 1 North Waukegan Rd, AP13A-3, North Chicago, IL, 60064, USA.
| | - Jennifer R King
- Clinical Pharmacology and Pharmacometrics (R4PK), AbbVie, Inc., 1 North Waukegan Rd, AP13A-3, North Chicago, IL, 60064, USA
| | - Akshanth R Polepally
- Clinical Pharmacology and Pharmacometrics (R4PK), AbbVie, Inc., 1 North Waukegan Rd, AP13A-3, North Chicago, IL, 60064, USA
| | - Barbara H McGovern
- Clinical Pharmacology and Pharmacometrics (R4PK), AbbVie, Inc., 1 North Waukegan Rd, AP13A-3, North Chicago, IL, 60064, USA
| | - Sandeep Dutta
- Clinical Pharmacology and Pharmacometrics (R4PK), AbbVie, Inc., 1 North Waukegan Rd, AP13A-3, North Chicago, IL, 60064, USA
| | - Rajeev M Menon
- Clinical Pharmacology and Pharmacometrics (R4PK), AbbVie, Inc., 1 North Waukegan Rd, AP13A-3, North Chicago, IL, 60064, USA
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Wong YC, Qian S, Zuo Z. Regioselective biotransformation of CNS drugs and its clinical impact on adverse drug reactions. Expert Opin Drug Metab Toxicol 2012; 8:833-54. [DOI: 10.1517/17425255.2012.688027] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/15/2023]
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LinWu SW, Wu CA, Peng FC, Wang AHJ. Structure-based development of bacterial nitroreductase against nitrobenzodiazepine-induced hypnosis. Biochem Pharmacol 2012; 83:1690-9. [PMID: 22445794 DOI: 10.1016/j.bcp.2012.03.003] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/21/2012] [Revised: 03/04/2012] [Accepted: 03/06/2012] [Indexed: 12/01/2022]
Abstract
Nitrobenzodiazepine (NBDZ) is an addictive drug of the abused substances that causes severe neurological effects and even death. Bacterial type I nitroreductase NfsB (EC 1.5.1.34) has been reported to catalyze NBDZ into inactive metabolite 7-amino-benzodiazepine (7ABDZ) with promising activity, so as to become an attractive candidate for treatment of NBDZ overdose and addiction. Here, we investigate the nitroreduction of an NBDZ, flunitrazepam (FZ), by various mutants of NfsB designed from the solved crystal structure and characterize their in vitro and in vivo potency. Conformational changes occurred in the active site of N71S/F124W in contrast to the wild-type, including the flipping on the aromatic rings of W124 and F70 as well as the extension on the hydrogen bond network between flavin mononucleotide (FMN) and S71, which allow the significant enlargement in the active site pocket. In the complex structure of N71S/F124W and nicotinamide (NIA), stacking sandwich attractions of W124-FMN-NIA were also found, implying the importance of W124 in substrate accessibility. Consequently, N71S/F124W exhibited increased 7AFZ production in vitro with nearly no toxicity and reduced 50% sleeping time (hypnosis) in vivo. Taken together, we demonstrate for the first time that N71S/F124W can serve as an effective antidote for NBDZ-induced hypnosis and provide the molecular basis for designing NfsB and the like in the future.
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Affiliation(s)
- Shiuan-Woei LinWu
- Institute of Biological Chemistry, Academia Sinica, Taipei 115, Taiwan
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Hosomi H, Fukami T, Iwamura A, Nakajima M, Yokoi T. Development of a Highly Sensitive Cytotoxicity Assay System for CYP3A4-Mediated Metabolic Activation. Drug Metab Dispos 2011; 39:1388-95. [DOI: 10.1124/dmd.110.037077] [Citation(s) in RCA: 44] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022] Open
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Invited Speaker Abstracts. Drug Metab Rev 2011. [DOI: 10.3109/03602532.2011.567804] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
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Iwamura A, Fukami T, Hosomi H, Nakajima M, Yokoi T. CYP2C9-Mediated Metabolic Activation of Losartan Detected by a Highly Sensitive Cell-Based Screening Assay. Drug Metab Dispos 2011; 39:838-46. [DOI: 10.1124/dmd.110.037259] [Citation(s) in RCA: 35] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/20/2023] Open
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Wan CK, Tse AK, Yu ZL, Zhu GY, Wang H, Fong DWF. Inhibition of cytochrome P450 3A4 activity by schisandrol A and gomisin A isolated from Fructus Schisandrae chinensis. PHYTOMEDICINE : INTERNATIONAL JOURNAL OF PHYTOTHERAPY AND PHYTOPHARMACOLOGY 2010; 17:702-5. [PMID: 20089387 DOI: 10.1016/j.phymed.2009.12.005] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/10/2009] [Revised: 10/09/2009] [Accepted: 12/14/2009] [Indexed: 05/20/2023]
Abstract
We studied the effects of schisandrol A (SCH) and gomisin A (GOM), two of the main bioactive components of Fructus Schisandrae chinensis, on cytochrome P450-3A4 (CYP3A4) activity and cellular glutathione (GSH) level. In a cell-free system both SCH and GOM inhibited CYP3A4 activity with IC(50) values of 32.02 microM and 1.39 microM, respectively. SCH or GOM at concentrations up to 100 microM did not alter cellular GSH level in regular HepG2 cells and P-glycoprotein overexpressing HepG2-DR cells. Since SCH and GOM may reverse multidrug resistance (MDR) by impeding the activity of P-glycoprotein, a membrane xenobiotic exporter, SCH or GOM could affect cellular drug metabolism in addition to drug uptake.
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Affiliation(s)
- C-K Wan
- National Heart, Lung, and Blood Institute, National Institutes of Health, Bethesda, MD 20892, USA
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LinWu SW, Wang AHJ, Peng FC. Flavin-containing reductase: new perspective on the detoxification of nitrobenzodiazepine. Expert Opin Drug Metab Toxicol 2010; 6:967-81. [DOI: 10.1517/17425255.2010.482928] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
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