1
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Brock WJ, Greene T, Van Landingham C, Gentry R. A weight of evidence evaluation of the mode of action of isoeugenol. Regul Toxicol Pharmacol 2024; 150:105642. [PMID: 38735521 DOI: 10.1016/j.yrtph.2024.105642] [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: 03/01/2024] [Revised: 04/21/2024] [Accepted: 05/06/2024] [Indexed: 05/14/2024]
Abstract
Isoeugenol is one of several phenylpropenoid compounds that is used as a fragrance, food flavoring agent and in aquaculture as a fish anesthetic. Carcinogenicity testing in rats and mice by NTP resulted in clear evidence of carcinogenicity (hepatic adenomas/carcinomas) in male mice only. A nongenotoxic threshold mode of action (MOA) is postulated for isoeugenol and is discussed considering the IPCS MOA and Human Relevance Framework. The weight of evidence indicates that isoeugenol is not genotoxic and that the carcinogenic outcome in male mice relates directly to the metabolism of individual compounds. Benchmark Dose (BMD) modeling was conducted to determine a Point of Departure (POD) and potential threshold of carcinogenicity. The results of the BMD evaluation for isoeugenol resulted in an estimated POD for carcinogenicity in the male mouse of 8 mg/kg with a lower limit of 4 mg/kg, representing a POD for the determination of an acceptable daily intake. With application of uncertainty factors, an ADI of 40 μg/kg is calculated. This daily dose in humans would be protective of human health, including carcinogenicity. A corresponding maximum residual level (MRL) of 3200 μg/kg fish is also estimated based on this POD that considers the threshold MOA.
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Affiliation(s)
- William J Brock
- Brock Scientific Consulting, LLC, Hilton Head Island, SC, USA.
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2
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Barman R, Kumar Bora P, Saikia J, Konwar P, Sarkar A, Kemprai P, Proteem Saikia S, Haldar S, Slater A, Banik D. Hypothetical biosynthetic pathways of pharmaceutically potential hallucinogenic metabolites in Myristicaceae, mechanistic convergence and co-evolutionary trends in plants and humans. PHYTOCHEMISTRY 2024; 218:113928. [PMID: 38035973 DOI: 10.1016/j.phytochem.2023.113928] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/29/2023] [Revised: 11/10/2023] [Accepted: 11/11/2023] [Indexed: 12/02/2023]
Abstract
The family Myristicaceae harbour mind-altering phenylpropanoids like myristicin, elemicin, safrole, tryptamine derivatives such as N,N-dimethyltryptamine (DMT) and 5-methoxy N,N-dimethyltryptamine (5-MeO-DMT) and β-carbolines such as 1-methyl-6-methoxy-dihydro-β-carboline and 2-methyl-6-methoxy-1,2,3,4-tetrahydro-β-carboline. This study aimed to systematically review and propose the hypothetical biosynthetic pathways of hallucinogenic metabolites of Myristicaceae which have the potential to be used pharmaceutically. Relevant publications were retrieved from online databases, including Google Scholar, PubMed Central, Science Direct and the distribution of the hallucinogens among the family was compiled. The review revealed that the biosynthesis of serotonin in plants was catalysed by tryptamine 5-hydroxylase (T5H) and tryptophan 5-hydroxylase (TPH), whereas in invertebrates and vertebrates only by tryptophan 5-hydroxylase (TPH). Indolethylamine-N-methyltransferase catalyses the biosynthesis of DMT in plants and the brains of humans and other mammals. Caffeic acid 3-O-methyltransferase catalyses the biosynthesis of both phenylpropanoids and tryptamines in plants. All the hallucinogenic markers exhibited neuropsychiatric effects in humans as mechanistic convergence. The review noted that DMT, 5-MeO-DMT, and β-carbolines were natural protectants against both plant stress and neurodegenerative human ailments. The protein sequence data of tryptophan 5-hydroxylase and tryptamine 5-hydroxylase retrieved from NCBI showed a co-evolutionary relationship in between animals and plants on the phylogenetic framework of a Maximum Parsimony tree. The review also demonstrates that the biosynthesis of serotonin, DMT, 5-MeO-DMT, 5-hydroxy dimethyltryptamine, and β-carbolines in plants, as well as endogenous secretion of these compounds in the brain and blood of humans and rodents, reflects co-evolutionary mutualism in plants and humans.
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Affiliation(s)
- Rubi Barman
- Agrotechnology and Rural Development Division, CSIR-North East Institute of Science and Technology, Jorhat - 785006, Assam, India; AcSIR - Academy of Scientific and Innovative Research, Ghaziabad - 201002, India
| | - Pranjit Kumar Bora
- Agrotechnology and Rural Development Division, CSIR-North East Institute of Science and Technology, Jorhat - 785006, Assam, India; AcSIR - Academy of Scientific and Innovative Research, Ghaziabad - 201002, India
| | - Jadumoni Saikia
- Agrotechnology and Rural Development Division, CSIR-North East Institute of Science and Technology, Jorhat - 785006, Assam, India; AcSIR - Academy of Scientific and Innovative Research, Ghaziabad - 201002, India
| | - Parthapratim Konwar
- Agrotechnology and Rural Development Division, CSIR-North East Institute of Science and Technology, Jorhat - 785006, Assam, India; AcSIR - Academy of Scientific and Innovative Research, Ghaziabad - 201002, India
| | - Aditya Sarkar
- Agrotechnology and Rural Development Division, CSIR-North East Institute of Science and Technology, Jorhat - 785006, Assam, India
| | - Phirose Kemprai
- Agrotechnology and Rural Development Division, CSIR-North East Institute of Science and Technology, Jorhat - 785006, Assam, India; AcSIR - Academy of Scientific and Innovative Research, Ghaziabad - 201002, India
| | - Siddhartha Proteem Saikia
- Agrotechnology and Rural Development Division, CSIR-North East Institute of Science and Technology, Jorhat - 785006, Assam, India; AcSIR - Academy of Scientific and Innovative Research, Ghaziabad - 201002, India
| | - Saikat Haldar
- Agrotechnology and Rural Development Division, CSIR-North East Institute of Science and Technology, Jorhat - 785006, Assam, India; AcSIR - Academy of Scientific and Innovative Research, Ghaziabad - 201002, India
| | - Adrian Slater
- Faculty of School of Health and Allied Sciences, Biomolecular Technology Group, Hawthorn Building HB1.12, De Montfort University, The Gateway, Leicester, LE1 9BH, UK
| | - Dipanwita Banik
- Agrotechnology and Rural Development Division, CSIR-North East Institute of Science and Technology, Jorhat - 785006, Assam, India; AcSIR - Academy of Scientific and Innovative Research, Ghaziabad - 201002, India.
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3
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Wang X, Ran G, Liao Y, Gong B, Wu C, Tan R, Liu Y, Zhang S, Peng Y, Li W, Zheng J. Formation of RNA adducts resulting from metabolic activation of spice ingredient safrole mediated by P450 enzymes and sulfotransferases. Food Chem Toxicol 2023; 174:113688. [PMID: 36841326 DOI: 10.1016/j.fct.2023.113688] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/12/2022] [Revised: 02/12/2023] [Accepted: 02/20/2023] [Indexed: 02/26/2023]
Abstract
Safrole (SFL) is an IARC class 2B carcinogen. To better understand the mechanism involved in SFL toxicity, we explored the potential interactions between SFL metabolites and RNA. Three guanosine adducts (G1-G3), two adenosine adducts (A1-A2), and two cytosine adducts (C1-C2) were detected by LC-MS/MS in mouse liver S9 incubations, cultured mouse primary hepatocytes, and liver tissues of mice after exposure to SFL. These adducts were chemically synthesized, and one of the guanosine adducts was structurally characterized by 1H-NMR. Studies in vitro and in vivo showed that SFL was oxidized by cytochrome P450 enzymes to the corresponding 1'-hydroxyl metabolite which was further metabolized by sulfotransferases to form allylic sulfate esters. The formed reactive intermediate(s) subsequently reacted with bases of RNA, leading to RNA adduction, which could play a partial role in the toxicities of SFL through the alteration of RNA biochemical properties and interruption of RNA functions.
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Affiliation(s)
- Xin Wang
- State Key Laboratory of Functions and Applications of Medicinal Plants, Guizhou Provincial Key Laboratory of Pharmaceutics, Guizhou Medical University, Guiyang, Guizhou, 550004, PR China; School of Pharmacy, Guizhou Medical University, Guiyang, Guizhou, 550004, PR China
| | - Guangyun Ran
- State Key Laboratory of Functions and Applications of Medicinal Plants, Guizhou Provincial Key Laboratory of Pharmaceutics, Guizhou Medical University, Guiyang, Guizhou, 550004, PR China; School of Pharmacy, Guizhou Medical University, Guiyang, Guizhou, 550004, PR China
| | - Yufen Liao
- State Key Laboratory of Functions and Applications of Medicinal Plants, Guizhou Provincial Key Laboratory of Pharmaceutics, Guizhou Medical University, Guiyang, Guizhou, 550004, PR China; School of Pharmacy, Guizhou Medical University, Guiyang, Guizhou, 550004, PR China
| | - Bowen Gong
- State Key Laboratory of Functions and Applications of Medicinal Plants, Guizhou Provincial Key Laboratory of Pharmaceutics, Guizhou Medical University, Guiyang, Guizhou, 550004, PR China; School of Basic Medical Sciences, Guizhou Medical University, Guiyang, Guizhou, 550004, PR China
| | - Chutian Wu
- State Key Laboratory of Functions and Applications of Medicinal Plants, Guizhou Provincial Key Laboratory of Pharmaceutics, Guizhou Medical University, Guiyang, Guizhou, 550004, PR China; School of Pharmacy, Guizhou Medical University, Guiyang, Guizhou, 550004, PR China
| | - Rong Tan
- State Key Laboratory of Functions and Applications of Medicinal Plants, Guizhou Provincial Key Laboratory of Pharmaceutics, Guizhou Medical University, Guiyang, Guizhou, 550004, PR China; School of Basic Medical Sciences, Guizhou Medical University, Guiyang, Guizhou, 550004, PR China; First Affiliated Hospital of Guizhou University of Traditional Chinese Medicine, Guiyang, 550001, PR China
| | - Ying Liu
- State Key Laboratory of Functions and Applications of Medicinal Plants, Guizhou Provincial Key Laboratory of Pharmaceutics, Guizhou Medical University, Guiyang, Guizhou, 550004, PR China; School of Basic Medical Sciences, Guizhou Medical University, Guiyang, Guizhou, 550004, PR China
| | - Shiyu Zhang
- State Key Laboratory of Functions and Applications of Medicinal Plants, Guizhou Provincial Key Laboratory of Pharmaceutics, Guizhou Medical University, Guiyang, Guizhou, 550004, PR China; School of Basic Medical Sciences, Guizhou Medical University, Guiyang, Guizhou, 550004, PR China; First Affiliated Hospital of Guizhou University of Traditional Chinese Medicine, Guiyang, 550001, PR China
| | - Ying Peng
- Wuya College of Innovation, Shenyang Pharmaceutical University, Shenyang, Liaoning, 110016, PR China.
| | - Weiwei Li
- State Key Laboratory of Functions and Applications of Medicinal Plants, Guizhou Provincial Key Laboratory of Pharmaceutics, Guizhou Medical University, Guiyang, Guizhou, 550004, PR China; School of Pharmacy, Guizhou Medical University, Guiyang, Guizhou, 550004, PR China.
| | - Jiang Zheng
- State Key Laboratory of Functions and Applications of Medicinal Plants, Guizhou Provincial Key Laboratory of Pharmaceutics, Guizhou Medical University, Guiyang, Guizhou, 550004, PR China; School of Pharmacy, Guizhou Medical University, Guiyang, Guizhou, 550004, PR China; Wuya College of Innovation, Shenyang Pharmaceutical University, Shenyang, Liaoning, 110016, PR China.
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Lunz K, Stappen I. Back to the Roots-An Overview of the Chemical Composition and Bioactivity of Selected Root-Essential Oils. Molecules 2021; 26:3155. [PMID: 34070487 PMCID: PMC8197530 DOI: 10.3390/molecules26113155] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/29/2021] [Revised: 05/18/2021] [Accepted: 05/20/2021] [Indexed: 11/30/2022] Open
Abstract
Since ancient times, plant roots have been widely used in traditional medicine for treating various ailments and diseases due to their beneficial effects. A large number of studies have demonstrated that-besides their aromatic properties-their biological activity can often be attributed to volatile constituents. This review provides a comprehensive overview of investigations into the chemical composition of essential oils and volatile components obtained from selected aromatic roots, including Angelica archangelica, Armoracia rusticana, Carlina sp., Chrysopogon zizanioides, Coleus forskohlii, Inula helenium, Sassafras albidum, Saussurea costus, and Valeriana officinalis. Additionally, their most important associated biological impacts are reported, such as anticarcinogenic, antimicrobial, antioxidant, pesticidal, and other miscellaneous properties. Various literature and electronic databases-including PubMed, ScienceDirect, Springer, Scopus, Google Scholar, and Wiley-were screened and data was obtained accordingly. The results indicate the promising properties of root-essential oils and their potential as a source for natural biologically active products for flavor, pharmaceutical, agricultural, and fragrance industries. However, more research is required to further establish the mechanism of action mediating these bioactivities as well as essential oil standardization because the chemical composition often strongly varies depending on external factors.
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Affiliation(s)
| | - Iris Stappen
- Department of Pharmaceutical Sciences, University of Vienna, 1090 Vienna, Austria;
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Uebel T, Hermes L, Haupenthal S, Müller L, Esselen M. α-Asarone, β-asarone, and γ-asarone: Current status of toxicological evaluation. J Appl Toxicol 2020; 41:1166-1179. [PMID: 33236787 DOI: 10.1002/jat.4112] [Citation(s) in RCA: 18] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/24/2020] [Revised: 10/27/2020] [Accepted: 10/29/2020] [Indexed: 12/29/2022]
Abstract
Asarone isomers are naturally occurring in Acorus calamus Linné, Guatteria gaumeri Greenman, and Aniba hostmanniana Nees. These secondary plant metabolites belong to the class of phenylpropenes (phenylpropanoids or alkenylbenzenes). They are further chemically classified into the propenylic trans- and cis-isomers α-asarone and β-asarone and the allylic γ-asarone. Flavoring, as well as potentially pharmacologically useful properties, enables the application of asarone isomers in fragrances, food, and traditional phytomedicine not only since their isolation in the 1950s. However, efficacy and safety in humans are still not known. Preclinical evidence has not been systematically studied, and several pharmacological effects have been reported for extracts of Acorus calamus and propenylic asarone isomers. Toxicological data are rare and not critically evaluated altogether in the 21st century yet. Therefore, within this review, available toxicological data of asarone isomers were assessed in detail. This assessment revealed that cardiotoxicity, hepatotoxicity, reproductive toxicity, and mutagenicity as well as carcinogenicity were described for propenylic asarone isomers with varying levels of reliability. The toxicodynamic profile of γ-asarone is unknown except for mutagenicity. Based on the estimated daily exposure and reported adverse effects, officials restricted or published recommendations for the use of β-asarone and preparations of Acorus calamus. In contrast, α-asarone and γ-asarone were not directly addressed due to a limited data situation.
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Affiliation(s)
- Thomas Uebel
- Institute of Food Chemistry, University of Münster, Münster, Germany
| | - Lena Hermes
- Institute of Food Chemistry, University of Münster, Münster, Germany
| | | | - Lena Müller
- Institute of Food Chemistry, University of Münster, Münster, Germany
| | - Melanie Esselen
- Institute of Food Chemistry, University of Münster, Münster, Germany
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6
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Kim SK, Lee S, Lee MK, Lee S. A systems pharmacology approach to investigate the mechanism of Oryeong-san formula for the treatment of hypertension. JOURNAL OF ETHNOPHARMACOLOGY 2019; 244:112129. [PMID: 31376514 DOI: 10.1016/j.jep.2019.112129] [Citation(s) in RCA: 20] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/15/2019] [Revised: 07/10/2019] [Accepted: 07/30/2019] [Indexed: 06/10/2023]
Abstract
ETHNOPHARMACOLOGICAL RELEVANCE Oryeong-san (ORS) is a traditional formula that has long been used for the treatment of dysfunctions of body fluids and electrolyte homeostasis in Korea, China and Japan. Recent reports have shown that ORS may suppress hypertension by controlling the renin-angiotensin-aldosterone system (RAAS) in the kidney, but its action mechanism has not been well defined. AIM OF THE STUDY The aim of this study was to decipher the ORS mechanisms in the treatment of hypertension using a systems pharmacology approach. MATERIALS AND METHODS The compounds of ORS were obtained from the TM-MC (database of medicinal materials and chemical compounds in Northeast Asian traditional medicine), and the drug-likeness (DL) and oral bioavailability (OB) of the compounds were evaluated. The potential targets of the compounds were identified using various pharmacology databases. To analyze the mechanisms of the ORS for hypertension, a Compound-Target-Disease (C-T-D) network was established with respect to the genes related to hypertension. RESULTS A screening evaluation of the DL and OB of the ORS compounds identified a list of 232 active compounds. The pharmacological activity of the targets was investigated by exploring the interaction network between the compounds and the targets. Analysis of the interactions between the compounds and the hypertension-related targets revealed that 14 ORS compounds regulate the RAAS and vasoconstrictors in the kidney. CONCLUSIONS This study used the systems pharmacology approach to decipher the mechanisms of action of ORS for the treatment of hypertension. When hypertension drugs and ORS are used in combination for treatment, possible side effects should be considered because most hypertension drugs are related to the RAAS. The results of this study may provide clues to not only analyze the pharmacological activity of ORS for the treatment of hypertension but other diseases as well.
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Affiliation(s)
- Sang-Kyun Kim
- Future Medicine Division, Korea Institute of Oriental Medicine, 1672 Yuseong-daero, Yuseong-gu, Daejeon, 34054, Republic of Korea.
| | - Seungho Lee
- Future Medicine Division, Korea Institute of Oriental Medicine, 1672 Yuseong-daero, Yuseong-gu, Daejeon, 34054, Republic of Korea.
| | - Myung-Ku Lee
- Future Medicine Division, Korea Institute of Oriental Medicine, 1672 Yuseong-daero, Yuseong-gu, Daejeon, 34054, Republic of Korea.
| | - Sanghun Lee
- Future Medicine Division, Korea Institute of Oriental Medicine, 1672 Yuseong-daero, Yuseong-gu, Daejeon, 34054, Republic of Korea.
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Kemprai P, Protim Mahanta B, Sut D, Barman R, Banik D, Lal M, Proteem Saikia S, Haldar S. Review on safrole: identity shift of the ‘candy shop’ aroma to a carcinogen and deforester. FLAVOUR FRAG J 2019. [DOI: 10.1002/ffj.3521] [Citation(s) in RCA: 19] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Affiliation(s)
- Phirose Kemprai
- Medicinal, Aromatic and Economic Plants Group, Biological Sciences and Technology Division Council of Scientific and Industrial Research (CSIR)–North East Institute of Science and Technology (NEIST) Jorhat Assam India
- Academy of Scientific and Innovative Research (AcSIR) New Delhi India
| | - Bhaskar Protim Mahanta
- Medicinal, Aromatic and Economic Plants Group, Biological Sciences and Technology Division Council of Scientific and Industrial Research (CSIR)–North East Institute of Science and Technology (NEIST) Jorhat Assam India
- Academy of Scientific and Innovative Research (AcSIR) New Delhi India
| | - Dristi Sut
- Medicinal, Aromatic and Economic Plants Group, Biological Sciences and Technology Division Council of Scientific and Industrial Research (CSIR)–North East Institute of Science and Technology (NEIST) Jorhat Assam India
- Academy of Scientific and Innovative Research (AcSIR) New Delhi India
| | - Rubi Barman
- Medicinal, Aromatic and Economic Plants Group, Biological Sciences and Technology Division Council of Scientific and Industrial Research (CSIR)–North East Institute of Science and Technology (NEIST) Jorhat Assam India
- Academy of Scientific and Innovative Research (AcSIR) New Delhi India
| | - Dipanwita Banik
- Medicinal, Aromatic and Economic Plants Group, Biological Sciences and Technology Division Council of Scientific and Industrial Research (CSIR)–North East Institute of Science and Technology (NEIST) Jorhat Assam India
| | - Mohan Lal
- Medicinal, Aromatic and Economic Plants Group, Biological Sciences and Technology Division Council of Scientific and Industrial Research (CSIR)–North East Institute of Science and Technology (NEIST) Jorhat Assam India
| | - Siddhartha Proteem Saikia
- Medicinal, Aromatic and Economic Plants Group, Biological Sciences and Technology Division Council of Scientific and Industrial Research (CSIR)–North East Institute of Science and Technology (NEIST) Jorhat Assam India
| | - Saikat Haldar
- Medicinal, Aromatic and Economic Plants Group, Biological Sciences and Technology Division Council of Scientific and Industrial Research (CSIR)–North East Institute of Science and Technology (NEIST) Jorhat Assam India
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8
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Tsou HH, Ko HT, Chen CT, Wang TW, Lee CH, Liu TY, Wang HT. Betel quid containing safrole enhances metabolic activation of tobacco specific 4-(methylnitrosamino)-1-(3-pyridyl)-1-butanone (NNK). ENVIRONMENTAL POLLUTION (BARKING, ESSEX : 1987) 2019; 251:13-21. [PMID: 31071628 DOI: 10.1016/j.envpol.2019.04.080] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/15/2019] [Revised: 04/03/2019] [Accepted: 04/15/2019] [Indexed: 06/09/2023]
Abstract
Cigarette smoking (CS) and betel quid (BQ) chewing are two known risk factors that have synergistic potential for the enhancing the development of oral squamous cell carcinoma (OSCC) in Taiwan. Most mutagens and carcinogens are metabolically activated by cytochrome P450 (CYP450) to exert their mutagenicity or carcinogenicity. Previous studies have shown that metabolic activation of the tobacco-specific nitrosamine, 4-(methylnitrosamino)-1-(3-pyridyl)-1-butanone (NNK), by CYP2A6 activity determines NNK-induced carcinogenesis. In addition, safrole affects cytochrome P450 activity in rodents. However, the effect of BQ safrole on the metabolism of tobacco-specific NNK and its carcinogenicity remains elusive. This study demonstrates that safrole (1 mg/kg/d) induced CYP2A6 activity, reduced urinary 4-(methylnitrosamino)-1-(3-pyridyl)-1-butanol (NNAL) levels, and increased NNK-induced DNA damage, including N7-methylguanine, 8-OH-deoxyguanosine and DNA strand breaks in a Syrian golden hamster model. Furthermore, altered NNK metabolism and increased NNK-induced DNA damage were also observed in healthy subjects with CS and BQ chewing histories compared to healthy subjects with CS histories. In conclusion, BQ containing safrole induced tobacco-specific NNK metabolic activation, resulting in higher NNK-induced genotoxicity. This study provides valuable insight into the synergistic mechanisms of CS- and BQ-induced OSCC.
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Affiliation(s)
- Han-Hsing Tsou
- Institute of Environmental and Occupational Health Sciences, National Yang-Ming University, Taipei, Taiwan
| | - Hsiao-Tung Ko
- Institute of Food Safety and Health Risk Assessment, National Yang-Ming University, Taipei, Taiwan
| | - Chia-Tzu Chen
- Institute of Environmental and Occupational Health Sciences, National Yang-Ming University, Taipei, Taiwan
| | - Tse-Wen Wang
- Institute of Food Safety and Health Risk Assessment, National Yang-Ming University, Taipei, Taiwan
| | - Chien-Hung Lee
- Department of Public Health, College of Health Sciences, Kaohsiung Medical University, Kaohsiung, Taiwan; Research Center for Environmental Medicine, Kaohsiung Medical University, Kaohsiung, Taiwan
| | - Tsung-Yun Liu
- Institute of Environmental and Occupational Health Sciences, National Yang-Ming University, Taipei, Taiwan; Institute of Food Safety and Health Risk Assessment, National Yang-Ming University, Taipei, Taiwan
| | - Hsiang-Tsui Wang
- Department of Pharmacology, National Yang-Ming University, Taipei, Taiwan.
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9
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A rapid and visible colorimetric fluorescent probe for benzenethiol flavor detection. Food Chem 2019; 286:322-328. [DOI: 10.1016/j.foodchem.2019.02.033] [Citation(s) in RCA: 24] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/01/2018] [Revised: 01/22/2019] [Accepted: 02/07/2019] [Indexed: 11/23/2022]
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10
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Triple quadrupole mass spectrometry comparative DNA adductomics of Hep G2 cells following exposure to safrole. Toxicol Lett 2019; 300:92-104. [DOI: 10.1016/j.toxlet.2018.10.023] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/16/2018] [Revised: 10/12/2018] [Accepted: 10/22/2018] [Indexed: 12/27/2022]
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11
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Yang AH, Zhang L, Zhi DX, Liu WL, Gao X, He X. Identification and analysis of the reactive metabolites related to the hepatotoxicity of safrole. Xenobiotica 2017; 48:1164-1172. [DOI: 10.1080/00498254.2017.1399227] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
Affiliation(s)
- Ai-Hong Yang
- School of Chinese Materia Medica, Tianjin University of Traditional Chinese Medicine, Tianjin, P. R. China,
- Tianjin State Key Laboratory of Modern Chinese Medicine, Tianjin, P. R. China, and
| | - Lei Zhang
- School of Chinese Materia Medica, Tianjin University of Traditional Chinese Medicine, Tianjin, P. R. China,
| | - De-Xian Zhi
- School of Chinese Materia Medica, Tianjin University of Traditional Chinese Medicine, Tianjin, P. R. China,
- School of Biotechnology Food Science, Tianjin Key Laboratory of Food and Biotechnology, Tianjin University of Commerce, Tianjin, P. R. China
| | - Wen-Li Liu
- School of Chinese Materia Medica, Tianjin University of Traditional Chinese Medicine, Tianjin, P. R. China,
| | - Xue Gao
- School of Chinese Materia Medica, Tianjin University of Traditional Chinese Medicine, Tianjin, P. R. China,
| | - Xin He
- School of Chinese Materia Medica, Tianjin University of Traditional Chinese Medicine, Tianjin, P. R. China,
- Tianjin State Key Laboratory of Modern Chinese Medicine, Tianjin, P. R. China, and
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12
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Rossa GE, Almeida RN, Vargas RMF, Cassel E, Moyna G. Sequential extraction methods applied toPiper hispidinervum: An improvement in the processing of natural products. CAN J CHEM ENG 2017. [DOI: 10.1002/cjce.23020] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/16/2023]
Affiliation(s)
- Guilherme E. Rossa
- Faculdade de Engenharia; Pontifícia Universidade Católica do Rio Grande do Sul; Avenida Ipiranga 6681, Pr. 30, 90619-900 Porto Alegre Brasil
| | - Rafael N. Almeida
- Faculdade de Engenharia; Pontifícia Universidade Católica do Rio Grande do Sul; Avenida Ipiranga 6681, Pr. 30, 90619-900 Porto Alegre Brasil
| | - Rubem Mário Figueiró Vargas
- Faculdade de Engenharia; Pontifícia Universidade Católica do Rio Grande do Sul; Avenida Ipiranga 6681, Pr. 30, 90619-900 Porto Alegre Brasil
| | - Eduardo Cassel
- Faculdade de Engenharia; Pontifícia Universidade Católica do Rio Grande do Sul; Avenida Ipiranga 6681, Pr. 30, 90619-900 Porto Alegre Brasil
| | - Guillermo Moyna
- Departamento de Química del Litoral; CENUR Litoral Norte; Universidad de la República; Ruta 3 Km 363 Paysandú 60000 Uruguay
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Physiologically based kinetic modeling of the bioactivation of myristicin. Arch Toxicol 2016; 91:713-734. [PMID: 27334372 PMCID: PMC5306082 DOI: 10.1007/s00204-016-1752-5] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/03/2016] [Accepted: 06/08/2016] [Indexed: 11/08/2022]
Abstract
The present study describes physiologically based kinetic (PBK) models for the alkenylbenzene myristicin that were developed by extension of the PBK models for the structurally related alkenylbenzene safrole in rat and human. The newly developed myristicin models revealed that the formation of the proximate carcinogenic metabolite 1′-hydroxymyristicin in liver is at most 1.8 fold higher in rat than in human and limited for the ultimate carcinogenic metabolite 1′-sulfoxymyristicin to (2.8–4.0)-fold higher in human. In addition, a comparison was made between the relative importance of bioactivation for myristicin and safrole. Model predictions indicate that for these related compounds, the formation of the 1′-sulfoxy metabolites in rat and human liver is comparable with a difference of <2.2-fold over a wide dose range. The results from this PBK analysis support that risk assessment of myristicin may be based on the BMDL10 derived for safrole of 1.9–5.1 mg/kg bw per day. Using an estimated daily intake of myristicin of 0.0019 mg/kg bw per day resulting from the use of herbs and spices, this results in MOE values for myristicin that amount to 1000–2700, indicating a priority for risk management. The results obtained illustrate that PBK modeling provides insight into possible species differences in the metabolic activation of myristicin. Moreover, they provide an example of how PBK modeling can facilitate a read-across in risk assessment from a compound for which in vivo toxicity studies are available to a related compound for which tumor data are not reported, thus contributing to alternatives in animal testing.
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14
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Hemeryck LY, Vanhaecke L. Diet-related DNA adduct formation in relation to carcinogenesis. Nutr Rev 2016; 74:475-89. [PMID: 27330144 DOI: 10.1093/nutrit/nuw017] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022] Open
Abstract
The human diet contributes significantly to the initiation and promotion of carcinogenesis. It has become clear that the human diet contains several groups of natural foodborne chemicals that are at least in part responsible for the genotoxic, mutagenic, and carcinogenic potential of certain foodstuffs. Electrophilic chemicals are prone to attack nucleophilic sites in DNA, resulting in the formation of altered nucleobases, also known as DNA adducts. Since DNA adduct formation is believed to signal the onset of chemically induced carcinogenesis, the DNA adduct-inducing potential of certain foodstuffs has been investigated to gain more insight into diet-related pathways of carcinogenesis. Many studies have investigated diet-related DNA adduct formation. This review summarizes work on known or suspected dietary carcinogens and the role of DNA adduct formation in hypothesized carcinogenesis pathways.
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Affiliation(s)
- Lieselot Y Hemeryck
- L.Y. Hemeryck and L. Vanhaecke are with the Laboratory of Chemical Analysis, Department of Veterinary Public Health and Food Safety, Faculty of Veterinary Medicine, Ghent University, Merelbeke, Belgium.
| | - Lynn Vanhaecke
- L.Y. Hemeryck and L. Vanhaecke are with the Laboratory of Chemical Analysis, Department of Veterinary Public Health and Food Safety, Faculty of Veterinary Medicine, Ghent University, Merelbeke, Belgium
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15
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Hrycay EG, Bandiera SM. Involvement of Cytochrome P450 in Reactive Oxygen Species Formation and Cancer. ADVANCES IN PHARMACOLOGY (SAN DIEGO, CALIF.) 2015; 74:35-84. [PMID: 26233903 DOI: 10.1016/bs.apha.2015.03.003] [Citation(s) in RCA: 118] [Impact Index Per Article: 13.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Abstract
This review examines the involvement of cytochrome P450 (CYP) enzymes in the formation of reactive oxygen species in biological systems and discusses the possible involvement of reactive oxygen species and CYP enzymes in cancer. Reactive oxygen species are formed in biological systems as byproducts of the reduction of molecular oxygen and include the superoxide radical anion (∙O2-), hydrogen peroxide (H2O2), hydroxyl radical (∙OH), hydroperoxyl radical (HOO∙), singlet oxygen ((1)O2), and peroxyl radical (ROO∙). Two endogenous sources of reactive oxygen species are the mammalian CYP-dependent microsomal electron transport system and the mitochondrial electron transport chain. CYP enzymes catalyze the oxygenation of an organic substrate and the simultaneous reduction of molecular oxygen. If the transfer of oxygen to a substrate is not tightly controlled, uncoupling occurs and leads to the formation of reactive oxygen species. Reactive oxygen species are capable of causing oxidative damage to cellular membranes and macromolecules that can lead to the development of human diseases such as cancer. In normal cells, intracellular levels of reactive oxygen species are maintained in balance with intracellular biochemical antioxidants to prevent cellular damage. Oxidative stress occurs when this critical balance is disrupted. Topics covered in this review include the role of reactive oxygen species in intracellular cell signaling and the relationship between CYP enzymes and cancer. Outlines of CYP expression in neoplastic tissues, CYP enzyme polymorphism and cancer risk, CYP enzymes in cancer therapy and the metabolic activation of chemical procarcinogens by CYP enzymes are also provided.
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Affiliation(s)
- Eugene G Hrycay
- Faculty of Pharmaceutical Sciences, The University of British Columbia, Vancouver, British Columbia, Canada.
| | - Stelvio M Bandiera
- Faculty of Pharmaceutical Sciences, The University of British Columbia, Vancouver, British Columbia, Canada
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16
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Rietjens IMCM, Cohen SM, Fukushima S, Gooderham NJ, Hecht S, Marnett LJ, Smith RL, Adams TB, Bastaki M, Harman CG, Taylor SV. Impact of Structural and Metabolic Variations on the Toxicity and Carcinogenicity of Hydroxy- and Alkoxy-Substituted Allyl- and Propenylbenzenes. Chem Res Toxicol 2014; 27:1092-103. [DOI: 10.1021/tx500109s] [Citation(s) in RCA: 37] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- I. M. C. M. Rietjens
- Division
of Toxicology, Wageningen University, Tuinlaan 5, 6703 HE Wageningen, The Netherlands
| | - S. M. Cohen
- Department
of Pathology and Microbiology, University of Nebraska Medical Center, 4400 Emile Street, Omaha, Nebraska 68198, United States
| | - S. Fukushima
- Japan Bioassay Research
Center, 2445, Hirasawa, Hadano-shi, Kanagawa 257-0015, Japan
| | - N. J. Gooderham
- Department
of Surgery and Cancer, Imperial College, London SW7 2AZ, United Kingdom
| | - S. Hecht
- Masonic
Cancer Center and Department of Laboratory Medicine and Pathology, University of Minnesota, MMC 806, 420 Delaware St. SE, Minneapolis, Minnesota 55455, United States
| | - L. J. Marnett
- Department
of Biochemistry, Center in Molecular Toxicology, Vanderbilt University School of Medicine, 1161 21st Avenue S # T1217, Nashville, Tennessee 37232-0146, United States
| | - R. L. Smith
- Molecular
Toxicology, Imperial College, London SW7 2AZ, United Kingdom
| | - T. B. Adams
- Verto Solutions, 1101,
17th Street NW Suite 700, Washington,
D.C. 20036, United States
| | - M. Bastaki
- Verto Solutions, 1101,
17th Street NW Suite 700, Washington,
D.C. 20036, United States
| | - C. G. Harman
- Verto Solutions, 1101,
17th Street NW Suite 700, Washington,
D.C. 20036, United States
| | - S. V. Taylor
- Verto Solutions, 1101,
17th Street NW Suite 700, Washington,
D.C. 20036, United States
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Alugolu V, Rentala S, Komarraju AL, Parimi UD. Docking studies of piperine - iron conjugate with human CYP450 3A4. Bioinformation 2013; 9:334-8. [PMID: 23750076 PMCID: PMC3669784 DOI: 10.6026/97320630009334] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/06/2013] [Accepted: 03/06/2013] [Indexed: 11/23/2022] Open
Abstract
Piperine, a major constituent of Piper nigrum (Black pepper), is one of the well known components in many Ayurvedic formulations. Piperine is most studied bioenhancer because it inhibits drug metabolizing enzymes in rodents and increases plasma concentrations of several drugs, including P-glycoprotein substrates. However, there areno evidences on piperine-iron conjugate to inhibit human CYP450 3A4. We therefore investigated the influence of piperine-Fe conjugate to study the metabolism of iron with CYP450 3A4. Our in silico results showed that Piperine when conjugated with iron, inhibited activity of CYP450 3A4. This improved the binding of piperine-Fe conjugate with CYP450 3A4 and increased bioavailability.
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Affiliation(s)
- Veerabrahmam Alugolu
- Department of Microbiology, GITAM Institute of Science, GITAM University, Rushikonda, Visakhapatnam – 530 045, INDIA
| | - Satyanarayana Rentala
- Department of Biotechnology, GITAM Institute of Technology, GITAM University, Rushikonda, Visakhapatnam – 530 045, India
| | - Aruna Lakshmi Komarraju
- Department of Biotechnology, GITAM Institute of Technology, GITAM University, Rushikonda, Visakhapatnam – 530 045, India
| | - Uma Devi Parimi
- Department of Chemistry, GITAM Institute of Science, GITAM University, Rushikonda, Visakhapatnam – 530 045, India
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Cavaco I, Hombhanje FW, Gil JP, Kaneko A. Frequency of the Functionally Relevant Aryl Hydrocarbon Receptor Repressor (AhRR) Pro185Ala SNP in Papua New Guinea. Drug Metab Pharmacokinet 2013; 28:519-21. [DOI: 10.2133/dmpk.dmpk-13-sc-035] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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19
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Hrycay EG, Bandiera SM. The monooxygenase, peroxidase, and peroxygenase properties of cytochrome P450. Arch Biochem Biophys 2012; 522:71-89. [DOI: 10.1016/j.abb.2012.01.003] [Citation(s) in RCA: 83] [Impact Index Per Article: 6.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/24/2011] [Revised: 12/22/2011] [Accepted: 01/04/2012] [Indexed: 12/30/2022]
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20
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Martati E, Boersma MG, Spenkelink A, Khadka DB, van Bladeren PJ, Rietjens IMCM, Punt A. Physiologically Based Biokinetic (PBBK) Modeling of Safrole Bioactivation and Detoxification in Humans as Compared With Rats. Toxicol Sci 2012; 128:301-16. [DOI: 10.1093/toxsci/kfs174] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
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21
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Jin M, Kijima A, Suzuki Y, Hibi D, Inoue T, Ishii Y, Nohmi T, Nishikawa A, Ogawa K, Umemura T. Comprehensive toxicity study of safrole using a medium-term animal model with gpt delta rats. Toxicology 2011; 290:312-21. [DOI: 10.1016/j.tox.2011.09.088] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/08/2011] [Revised: 09/29/2011] [Accepted: 09/30/2011] [Indexed: 01/18/2023]
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22
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Martati E, Boersma MG, Spenkelink A, Khadka DB, Punt A, Vervoort J, van Bladeren PJ, Rietjens IMCM. Physiologically Based Biokinetic (PBBK) Model for Safrole Bioactivation and Detoxification in Rats. Chem Res Toxicol 2011; 24:818-34. [DOI: 10.1021/tx200032m] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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23
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Maffei ME, Gertsch J, Appendino G. Plant volatiles: Production, function and pharmacology. Nat Prod Rep 2011; 28:1359-80. [DOI: 10.1039/c1np00021g] [Citation(s) in RCA: 216] [Impact Index Per Article: 16.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/29/2022]
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24
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Affiliation(s)
- Cyrus Rangan
- Department of Adolescent Medicine, Childrens Hospital Los Angeles, Los Angeles, California, USA
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25
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Nakagawa Y, Suzuki T, Nakajima K, Ishii H, Ogata A. Biotransformation and cytotoxic effects of hydroxychavicol, an intermediate of safrole metabolism, in isolated rat hepatocytes. Chem Biol Interact 2009; 180:89-97. [PMID: 19428348 DOI: 10.1016/j.cbi.2009.02.003] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/23/2008] [Revised: 02/04/2009] [Accepted: 02/05/2009] [Indexed: 10/21/2022]
Abstract
The biotransformation and cytotoxic effects of hydroxychavicol (HC; 1-allyl-3,4-dihydroxybenzene), which is a catecholic component in piper betel leaf and a major intermediary metabolite of safrole in rats and humans, was studied in freshly isolated rat hepatocytes. The exposure of hepatocytes to HC caused not only concentration (0.25-1.0mM)- and time (0-3h)-dependent cell death accompanied by the loss of cellular ATP, adenine nucleotide pools, reduced glutathione, and protein thiols, but also the accumulation of glutathione disulfide and malondialdehyde, indicating lipid peroxidation. At a concentration of 1mM, the cytotoxic effects of safrole were less than those of HC. The loss of mitochondrial membrane potential and generation of oxygen radical species assayed using 2',7'-dichlorodihydrofluoresein diacetate (DCFH-DA) in hepatocytes treated with HC were greater than those with safrole. HC at a weakly toxic level (0.25 and/or 0.50mM) was metabolized to monoglucuronide, monosulfate, and monoglutathione conjugates, which were identified by mass spectra and/or (1)H nuclear magnetic resonance spectra. The amounts of sulfate rather than glucuronide or glutathione conjugate predominantly increased, accompanied by a loss of the parent compound, with time. In hepatocytes pretreated with either diethyl maleate or salicylamide, HC-induced cytotoxicity was enhanced, accompanied by a decrease in the formation of these conjugates and by the inhibition of HC loss. Taken collectively, our results indicate that (a) mitochondria are target organelles for HC, which elicits cytotoxicity through mitochondrial failure related to mitochondrial membrane potential at an early stage and subsequently lipid peroxidation through oxidative stress at a later stage; (b) the onset of cytotoxicity depends on the initial and residual concentrations of HC rather than those of its metabolites; (c) the toxicity of HC is greater than that of safrole, suggesting the participation of a catecholic intermediate in safrole cytotoxicity in rat hepatocytes.
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Affiliation(s)
- Yoshio Nakagawa
- Division of Pharmacology, Tokyo Metropolitan Institute of Public Health, Tokyo, Japan.
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26
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Srinivasan K. Black pepper and its pungent principle-piperine: a review of diverse physiological effects. Crit Rev Food Sci Nutr 2008; 47:735-48. [PMID: 17987447 DOI: 10.1080/10408390601062054] [Citation(s) in RCA: 416] [Impact Index Per Article: 26.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
Abstract
Black pepper (Piper nigrum) is one of the most widely used among spices. It is valued for its distinct biting quality attributed to the alkaloid, piperine. Black pepper is used not only in human dietaries but also for a variety of other purposes such as medicinal, as a preservative, and in perfumery. Many physiological effects of black pepper, its extracts, or its major active principle, piperine, have been reported in recent decades. Dietary piperine, by favorably stimulating the digestive enzymes of pancreas, enhances the digestive capacity and significantly reduces the gastrointestinal food transit time. Piperine has been demonstrated in in vitro studies to protect against oxidative damage by inhibiting or quenching free radicals and reactive oxygen species. Black pepper or piperine treatment has also been evidenced to lower lipid peroxidation in vivo and beneficially influence cellular thiol status, antioxidant molecules and antioxidant enzymes in a number of experimental situations of oxidative stress. The most far-reaching attribute of piperine has been its inhibitory influence on enzymatic drug biotransforming reactions in the liver. It strongly inhibits hepatic and intestinal aryl hydrocarbon hydroxylase and UDP-glucuronyl transferase. Piperine has been documented to enhance the bioavailability of a number of therapeutic drugs as well as phytochemicals by this very property. Piperine's bioavailability enhancing property is also partly attributed to increased absorption as a result of its effect on the ultrastructure of intestinal brush border. Although initially there were a few controversial reports regarding its safety as a food additive, such evidence has been questionable, and later studies have established the safety of black pepper or its active principle, piperine, in several animal studies. Piperine, while it is non-genotoxic, has in fact been found to possess anti-mutagenic and anti-tumor influences.
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Affiliation(s)
- K Srinivasan
- Department of Biochemistry and Nutrition, Central Food Technological Research Institute, Mysore, India.
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27
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Wong RH, Hu CW, Yeh CY, Chao MR, Chen CC, Huang JH, Chang SH, Lee SI, Lee HS. Sulfotransferase 1A1 and glutathione S-transferase P1 genetic polymorphisms modulate the levels of urinary 8-hydroxy-2'-deoxyguanosine in betel quid chewers. Arch Toxicol 2007; 82:313-21. [PMID: 17912498 DOI: 10.1007/s00204-007-0248-8] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/11/2007] [Accepted: 09/11/2007] [Indexed: 10/22/2022]
Abstract
Betel quid chewing has been associated with several human cancers. However, the role of betel quid in carcinogenesis remains uncertain. Piper betel contains high concentrations of safrole (an inducer of DNA oxidative damage). Safrole may be metabolized by hepatic sulfotransferase 1A1 (SULT1A1), or glutathione S-transferases (GSTM1, GSTT1, and GSTP1). Thus, we investigated the association of genetic polymorphisms of SULT1A1, GSTM1, GSTT1, and GSTP1 with DNA oxidative damage among betel quid chewers. A biomarker for oxidative stress, urinary 8-hydroxy-2'-deoxyguanosine (8-OHdG) level, was analyzed using isotope-dilution LC-MS/MS in 64 betel quid chewers and 129 non-betel quid chewers. Data on demographics and habits (smoking, alcohol drinking, and betel quid chewing) were obtained from questionnaires. Our results revealed that urinary 8-OHdG level was higher in chewers with SULT1A1 Arg-His genotype than in chewers with SULT1A1 Arg-Arg genotype. Urinary 8-OHdG level was also higher in chewers with GSTP1 Ile-Ile genotype. Furthermore, the combined effect of SULT1A1 and GSTP1 genotypes on urinary 8-OHdG was evaluated. Non-chewers with both SULT1A1 Arg-Arg and GSTP1 Val-Val/Ile-Val (reference group) had the lowest mean level (3.6 ng/mg creatinine), whereas chewers with either SULT1A1 Arg-His or GSTP1 Ile-Ile had the highest 8-OHdG mean level (6.2 ng/mg creatinine; vs. reference group, P = 0.04). Chewers with both of SULT1A1 Arg-Arg and GSTP1 Val-Val/Ile-Val (4.6 ng/mg creatinine), and non-chewers with either SULT1A1 Arg-His or GSTP1 Ile-Ile (4.7 ng/mg creatinine) had a moderately increased 8-OHdG level. Thus, the susceptible SULT1A1 and GSTP1 genotypes may modulate increased DNA oxidative stress elicited by betel-quid chewing.
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Affiliation(s)
- Ruey-Hong Wong
- Department of Public Health, College of Health Care and Management, Chung Shan Medical University, No. 110 Chien-Kuo N. Road Sec. 1, Taichung, Taiwan.
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28
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Reynertson KA, Balick MJ, Lee R, Raynor W, Pelep Y, Kennelly EJ. A traditional method of Cinnamomum carolinense preparation eliminates safrole from a therapeutic Pohnpean tea. JOURNAL OF ETHNOPHARMACOLOGY 2005; 102:269-74. [PMID: 16109467 DOI: 10.1016/j.jep.2005.06.040] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/11/2004] [Revised: 06/10/2005] [Accepted: 06/22/2005] [Indexed: 05/04/2023]
Abstract
Cinnamomum carolinense, locally known as madeu, is a tree endemic to the volcanic mountains of the Island of Pohnpei in the Eastern Carolines of the South Pacific. The bark is harvested from trees and brewed to make a medicinal tea and hot beverage that is regularly consumed. Many species of Cinnamomum contain the known hepatocarcinogen safrole, sparking concern regarding habitual consumption of this beverage. HPLC-PDA analysis confirmed the presence of the carcinogen in alcoholic extracts of Cinnamomum carolinense bark shavings (0.435%, w/w), but safrole was not detected in the tea. The limit of detection and limit of quantitation of safrole were determined to be 1.25 and 3.75 microg/mL, respectively. The traditional preparation method, which boils the bark shavings, degrades the safrole.
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Affiliation(s)
- Kurt A Reynertson
- Lehman College and The Graduate Center, City University of New York, 250 Bedford Park Boulevard West, Bronx, NY 10468, USA
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29
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Ueng YF, Hsieh CH, Don MJ. Inhibition of human cytochrome P450 enzymes by the natural hepatotoxin safrole. Food Chem Toxicol 2005; 43:707-12. [PMID: 15778010 DOI: 10.1016/j.fct.2005.01.008] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
The hepatotoxin, safrole is a methylenedioxy phenyl compound, found in sassafras oil and certain other essential oils. Recombinant cytochrome P450 (CYP, P450) and human liver microsomes were studied to investigate the selective inhibitory effects of safrole on human P450 enzymes and the mechanisms of action. Using Escherichia coli-expressed human P450, our results demonstrated that safrole was a non-selective inhibitor of CYP1A2, CYP2A6, CYP2D6, CYP2E1, and CYP3A4 in the IC(50) order CYP2E1 < CYP1A2 < CYP2A6 < CYP3A4 < CYP2D6. Safrole strongly inhibited CYP1A2, CYP2A6, and CYP2E1 activities with IC(50) values less than 20 microM. Safrole caused competitive, non-competitive, and non-competitive inhibition of CYP1A2, CYP2A6 and CYP2E1 activities, respectively. The inhibitor constants were in the order CYP1A2 < CYP2E1 < CYP2A6. In human liver microsomes, 50 microM safrole strongly inhibited 7-ethoxyresorufin O-deethylation, coumarin hydroxylation, and chlorzoxazone hydroxylation activities. These results revealed that safrole was a potent inhibitor of human CYP1A2, CYP2A6, and CYP2E1. With relatively less potency, CYP2D6 and CYP3A4 were also inhibited.
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Affiliation(s)
- Yune-Fang Ueng
- National Research Institute of Chinese Medicine, 155-1, Li-Nong Street, Sec. 2, Taipei 112, Taiwan, ROC.
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Chemical composition and biological activities of Ishpingo essential oil, a traditional Ecuadorian spice from Ocotea quixos (Lam.) Kosterm. (Lauraceae) flower calices. Food Chem 2004. [DOI: 10.1016/j.foodchem.2003.07.019] [Citation(s) in RCA: 94] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
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Abstract
Changes in dietary habits favouring diets rich in fruits and vegetables, and a meteoric rise in the consumption of dietary supplements and herbal products have substantially increased human exposure to phytochemicals. It is, therefore, not surprising that diet and herbal remedies can modulate drug-metabolising enzyme systems, such as cytochromes P450, leading to clinically relevant drug-phytochemical interactions. Phytochemicals have the potential to both elevate and suppress cytochrome P450 activity. Such effects are more likely to occur in the intestine, where high concentrations of phytochemicals may be achieved, and alteration in cytochrome P450 activity will influence, in particular, the fate of drugs that are subject to extensive first-pass metabolism as a result of intestinal cytochrome P450-mediated biotransformation. Moreover, it is becoming increasingly apparent that phytochemicals can also influence the pharmacological activity of drugs by modifying their absorption characteristics through interaction with drug transporters. Clearly, phytochemicals have the potential to alter the effectiveness of drugs, either impairing or exaggerating their pharmacological activity.
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Affiliation(s)
- Costas Ioannides
- Molecular Toxicology Group, School of Biomedical and Life Sciences, University of Surrey, Guildford, Surrey, GU2 7XH, UK.
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32
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Abstract
1. The use of herbal products to treat a wide range of conditions is rising rapidly, leading to increased intake of phytochemicals. Recent studies revealed potentially fatal interactions between herbal remedies and traditional drugs. 2. In transplant patients, self-medication with St John's wort (Hypericum perforatum) has led to a drop in plasma levels of the immunosuppressant drug cyclosporine, causing tissue rejection. 3. Intake of St John's wort increases the expression of intestinal P-glycoprotein and the expression of CYP3A4 in the liver and intestine. The combined up-regulation in intestinal P-glycoprotein and hepatic and intestinal CYP3A4 impairs the absorption and stimulates the metabolism of cyclosporine, leading to subtherapeutic plasma levels. The St John's wort component, hyperforin, contributes to the induction of CYP3A4. 4. St John's wort also enhances the metabolism of other CYP3A4 substrates including the protease inhibitors indinavir and nevirapine, oral contraceptives, and tricyclic antidepressants such as amitriptyline. 5. Other herbal remedies with the potential to modulate cytochrome P450 activity and thus participate in interactions with conventional drugs include Milk thistle, Angelica dahurica, ginseng, garlic preparations, Danshen and liquorice. 6. Herbal products are currently not subject to the rigorous testing indispensable for conventional drugs. However, if potential drug interactions are to be predicted, it is essential that the ability of herbal products to interfere with drug-metabolizing enzyme systems is fully established.
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Affiliation(s)
- C Ioannides
- Molecular Toxicology Group, School of Biomedical and Life Sciences, University of Surrey, Guildford GU2 7XH, UK.
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Wu MT, Lee YC, Chen CJ, Yang PW, Lee CJ, Wu DC, Hsu HK, Ho CK, Kao EL, Lee JM. Risk of betel chewing for oesophageal cancer in Taiwan. Br J Cancer 2001; 85:658-60. [PMID: 11531247 PMCID: PMC2364131 DOI: 10.1054/bjoc.2001.1927] [Citation(s) in RCA: 84] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022] Open
Abstract
Among 104 cases of squamous-cell oesophageal carcinoma patients and 277 controls in Taiwan, after adjusting for cigarette smoking, alcohol consumption, and other confounders, we found that subjects who chewed from 1 to 495 betel-year and more than 495 betel-years (about 20 betel quid per day for 20 years) had 3.6-fold (95% Cl = 1.3-10.1) and 9.2-fold risk (95% Cl = 1.8-46.7), respectively, of developing oesophageal cancer, compared to those who did not chew betel.
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Affiliation(s)
- M T Wu
- Division of Environmental Health and Occupational Medicine, National Health Research Institutes, Kaohsiung, Taiwan.
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Abdo KM, Cunningham ML, Snell ML, Herbert RA, Travlos GS, Eldridge SR, Bucher JR. 14-Week toxicity and cell proliferation of methyleugenol administered by gavage to F344 rats and B6C3F1 mice. Food Chem Toxicol 2001; 39:303-16. [PMID: 11295478 DOI: 10.1016/s0278-6915(00)00143-5] [Citation(s) in RCA: 19] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
Abstract
Methyleugenol, a food flavor and fragrance agent, was tested for toxicity in male and female F344/N rats and B6C3F1 mice. Groups of 10 males and 10 females per sex per species were administered 0, 10, 30, 100, 300 or 1000 mg methyleugenol/kg body weight in 0.5% aqueous methylcellulose by gavage, 5 days per week for 14 weeks. Additional groups of rats and mice of each sex were dosed similarly and used for hematology and clinical chemistry studies. Groups of 10 male and 10 female rats and mice received the vehicle by gavage on the same dosing schedule and served as vehicle controls. For serum gastrin, gastric pH and cell proliferation studies groups of 10 female rats were given 0, 37, 75 or 150 mg/kg, once daily 5 days per week for 30 or 90 days or 300 or 1000 mg/kg for 30 days; male mice were given 0, 9, 18.5, 37, 75, 150 or 300 mg/kg for 30 or 90 days. For the gastrin, pH and cell proliferation studies, groups of 10 female rats and 10 male mice were given the vehicle for 30 or 90 days and served as controls. Methyleugenol administration to rats induced erythrocyte microcytosis and thrombocytosis in male and female rats. It also caused an increase in serum alanine aminotransferase and sorbitol dehydrogenase activities and bile acid concentration, suggesting hepatocellular injury, cholestasis or altered hepatic function. Additionally, methyleugenol induced hypoproteinemia and hypoalbuminemia, evidenced by decreased total protein and albumin concentrations in both male and female rats, suggesting in inefficiency of dietary protein utilization due to methyleugenol-induced toxic effects on the liver and glandular stomach of rats and mice. The increase in gastrin and gastric pH of rats and mice given methyleugenol suggests that gastrin feedback was impaired and resulted in conditions not conducive to protein digestion. In rats, methyleugenol caused an increase in the incidences of hepatocyte cytologic alteration, cytomegaly, Kupffer cell pigmentation, mixed foci of cellular alteration and bile duct hyperplasia of the liver and atrophy and chronic inflammation of the mucosa of the glandular stomach. In mice, it caused an increase in the incidence of cytologic alteration, necrosis, bile duct hyperplasia and subacute inflammation of the liver and atrophy, degeneration, necrosis, edema, mitotic alteration, and cystic glands of the fundic region of the glandular stomach. The increased incidences of adrenal gland cortical hypertrophy and/or cytoplasmic alteration in the submandibular salivary glands, adrenal glands, testis and uterus of rats were considered secondary to the chemical-related effects observed in the liver and glandular stomach. Based on mortality, body weight gain, clinical chemistry and gross and microscopic evaluation of tissues of rats and mice, the no-observed-effect level (NOEL) of methyleugenol for both species was estimated at 10 mg/kg.
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Affiliation(s)
- K M Abdo
- National Institute of Environmental Health Sciences, Research, Triangle Park, NC 27709, USA
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35
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Guenthner TM, Luo G. Investigation of the role of the 2',3'-epoxidation pathway in the bioactivation and genotoxicity of dietary allylbenzene analogs. Toxicology 2001; 160:47-58. [PMID: 11246123 DOI: 10.1016/s0300-483x(00)00456-x] [Citation(s) in RCA: 46] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
Abstract
The genotoxic potential of naturally occurring allylbenzene analogs, including safrole, eugenol, estragole, and others, has been examined in many studies over the past 30 years. It has been established that these compounds are subject to biotransformation in the liver, which can lead to the formation of reactive electrophilic intermediates. The major route of bioactivation is via hydroxylation of the 1' carbon atom of the allylic side chain. We have synthesized 2',3'- (allylic) epoxide derivatives of allylbenzene, estragole eugenol and safrole, and have used them to characterize the genotoxic potential of epoxidation at the allylic double bond for allylbenzene and its naturally occurring analogs. In order to assert that this pathway has the potential for genotoxicity, it is necessary to demonstrate (1) that epoxide metabolites of these compounds are capable of forming covalent adducts with DNA bases; and (2) that these epoxide metabolites are actually formed in vivo. We have demonstrated that allylic epoxides derived from allylbenzene and estragole are capable of forming covalent adducts with all four deoxyribonucleotides in vitro and, in the case of deoxyguanosine, form at least four different adducts. We also deduce, from evidence obtained using the isolated perfused rat liver, that formation of potentially genotoxic 2',3' epoxide metabolites occurs readily in vivo, but that these metabolites are rapidly further metabolized to less toxic dihydrodiol or glutathione conjugates. We conclude that 2',3' epoxide metabolites of allylbenzene analogs are formed in vivo and that these epoxides are sufficiently reactive to facilely form covalent bonds with DNA bases. Epoxide formation at the allylic double bond represents, therefore, a potentially genotoxic bioactivation pathway for allylbenzene analogs. However, comparison of the relative kinetics of epoxide metabolism and epoxide formation suggests that a wide margin of protection from DNA covalent adduct formation exists in the rat liver, thus preventing genotoxicity resulting from this pathway to any significant degree. In this regard, we have also observed that the general rate of epoxide hydrolysis is much greater in human liver than in rat liver. We therefore suggest that while the epoxidation pathway poses a potential genotoxic threat to humans, no actual genotoxicity occurs as a result of this metabolic pathway.
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Affiliation(s)
- T M Guenthner
- Department of Pharmacology, College of Medicine, University of Illinois at Chicago, 835 South Wolcott Avenue, Chicago, IL 60612, USA.
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36
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Burkey JL, Sauer JM, McQueen CA, Sipes IG. Cytotoxicity and genotoxicity of methyleugenol and related congeners-- a mechanism of activation for methyleugenol. Mutat Res 2000; 453:25-33. [PMID: 11006409 DOI: 10.1016/s0027-5107(00)00070-1] [Citation(s) in RCA: 71] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
Abstract
Methyleugenol is a substituted alkenylbenzene found in a variety of foods, products, and essential oils. In a 2-year bioassay conducted by the National Toxicology Program, methyleugenol caused neoplastic lesions in the livers of Fischer 344 rats and B6C3F(1) mice. We were interested in the cytotoxicity and genotoxicity caused by methyleugenol and other alkenylbenzene compounds: safrole (a known hepatocarcinogen), eugenol, and isoeugenol. The endpoints were evaluated in cultured primary hepatocytes isolated from male Fischer 344 rats and female B6C3F(1) mice. Cytotoxicity was determined by measuring lactate dehydrogenase (LDH) release, while genotoxicity was determined by using the unscheduled DNA synthesis (UDS) assay. Rat and mouse hepatocytes showed similar patterns of toxicity for each chemical tested. Methyleugenol and safrole were relatively non-cytotoxic, but caused UDS at concentrations between 10 and 500 microM. In contrast, isoeugenol and eugenol produced cytotoxicity in hepatocytes with LC50s of approximately 200-300 microM, but did not cause UDS. Concurrent incubation of 2000 microM cyclohexane oxide (CHO), an epoxide hydrolase competitor, with a non-cytotoxic concentration of methyleugenol (10 microM) resulted in increased cytotoxicity but had no effect on genotoxicity. However, incubation of 15 microM pentacholorophenol, a sulfotransferase inhibitor, with 10 uM methyleugenol resulted in increased cytotoxicity but had a significant reduction of genotoxicity. These results suggest that methyleugenol is similar to safrole in its ability to cause cytotoxicity and genotoxicity in rodents. It appears that the bioactivation of methyleugenol to a DNA reactive electrophile is mediated by a sulfotransferase in rodents, but epoxide formation is not responsible for the observed genotoxicity.
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Affiliation(s)
- J L Burkey
- Lilly Research Laboratories, A Division of Eli Lilly and Company, Indianapolis, IN, USA
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37
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Nakajima M, Suzuki M, Yamaji R, Takashina H, Shimada N, Yamazaki H, Yokoi T. Isoform selective inhibition and inactivation of human cytochrome P450s by methylenedioxyphenyl compounds. Xenobiotica 1999; 29:1191-202. [PMID: 10647906 DOI: 10.1080/004982599237877] [Citation(s) in RCA: 18] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/16/2022]
Abstract
1. A series of methylenedioxyphenyl compounds were evaluated for their inhibitory and inactivation effects on nine human cytochrome P450 (CYP) activities using microsomes from human B-lymphoblast cells expressing specific human CYP isoforms. 2. Methylenedioxyphenyl compounds which possess a bulky structure such as 1,4-benzothiazine showed substantial inhibition of S-warfarin 7-hydroxylation catalysed by CYP2C9, S-mephenytoin 4'-hydroxylation by CYP2C19, bufuralol 1'-hydroxylation by CYP2D6, and testosterone 6beta-hydroxylation by CYP3A4. Regarding ethoxyresorufin O-deethylation catalysed by CYP1A1 and benzyloxyresorufin O-dealkylation by CYP2B6, the subtle change of a substitution of the 1,4-benzothiazine structure affected the inhibition selectivity. Ethoxyresorufin O-deethylation by CYP1A2, coumarin 7-hydroxylation by CYP2A6, and chlorzoxazone 6-hydroxylation by CYP2E1 were not inhibited by almost any of the methylenedioxyphenyl compounds. The inhibitory effects of methylenedioxyphenyl compounds that possess a short chain amino group on the human CYP isoforms were not significant. 3. The methylenedioxyphenyl compounds inactivated CYP1A1 (k(inact) = 0.034 min(-1) and K(i) = 0.81 microM), CYP2C9 (k(inact) = 0.041 and 0.042 min(-1) and K(i) = 0.56 and 0.15 microM), CYP2D6 (k(inact) = 0.044-0.339 min(-1) and K(i) = 0.21-19.88 microM), and CYP3A4 (k(inact) = 0.076-0.251 min(-1) and K(i) = 0.25-0.69 microM). These results suggested that the methylenedioxyphenyl compounds investigated in this study would be potent mechanism-based inactivators of these human CYP isoforms. In contrast, CYP2B6 and CYP2C19 were not inactivated. 4. The present study suggested that the selectivity of inhibition or inactivation of human CYP isoforms by methylenedioxyphenyl compounds may vary according to the structure of the side chain.
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Affiliation(s)
- M Nakajima
- Division of Drug Metabolism, Faculty of Pharmaceutical Sciences, Kanazawa University, Japan
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38
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Chen CL, Chi CW, Chang KW, Liu TY. Safrole-like DNA adducts in oral tissue from oral cancer patients with a betel quid chewing history. Carcinogenesis 1999; 20:2331-4. [PMID: 10590228 DOI: 10.1093/carcin/20.12.2331] [Citation(s) in RCA: 81] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022] Open
Abstract
Betel quid (BQ) chewing has been associated with an increased risk of oral squamous cell carcinoma (OSCC) and oral submucous fibrosis (OSF). Piper betel inflorescence, which contains 15 mg/g safrole, is a unique ingredient of BQ in Taiwan. Chewing such prepared BQ may contribute to safrole exposure in human beings (420 microM safrole in saliva). Safrole is a known rodent hepatocarcinogen, yet its carcinogenicity in human beings is largely undetermined. In this study, using a (32)P-post-labeling method, we have found a high frequency of safrole-like DNA adducts in BQ-associated OSCC (77%, 23/30) and non-cancerous matched tissue (NCMT) (97%, 29/30). This was in contrast to the absence (< 1/10(9) nucleotides) of such adducts in all of non-BQ-associated OSCC and their paired NCMT (P < 0.001). Six of seven OSF also exhibited the same safrole-like DNA adduct. The DNA adduct levels in OSF and NCMT were significantly higher than in OSCC (P < 0.05). Using co-chromatography and rechromatography techniques, we further demonstrated that these adducts were identical to synthetic safrole-dGMP adducts as well as DNA adducts from 1'-hydroxysafrole-treated HepG2 cells. These results suggest that safrole forms stable safrole-DNA adducts in human oral tissue following BQ chewing, which may contribute to oral carcinogenesis.
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Affiliation(s)
- C L Chen
- Institute of Pharmacology, National Yang-Ming University, Taipei, Taiwan, Republic of China
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Liu TY, Chen CC, Chen CL, Chi CW. Safrole-induced oxidative damage in the liver of Sprague-Dawley rats. Food Chem Toxicol 1999; 37:697-702. [PMID: 10496370 DOI: 10.1016/s0278-6915(99)00055-1] [Citation(s) in RCA: 38] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/31/2023]
Abstract
Safrole is a weak hepatocarcinogen, and its carcinogenic effect has been linked to the formation of stable safrole DNA adducts. In this study, we tested whether safrole also induces oxidative damages in Sprague-Dawley rats. By single i.p. injection, safrole dose-dependently induced the formation of hepatic lipid hydroperoxides (LHP) and 8-hydroxy-2'-deoxyguanosine (8-OH-dG). The safrole-induced LHP reached peak level on day 3 and gradually returned to the basal level on day 15. On the other hand, 8-OH-dG levels from the similarly treated rats peaked on day 5 and returned to basal level on day 15. Safrole also dose-dependently induced serum alanine aminotransferase (ALT) and aspartate aminotransferase (AST) activities. We also examined the protective effect of vitamin E, deferoxamine and N-acetylcysteine against the safrole-induced oxidative damage. N-Acetylcysteine, the precursor of glutathione, exerted the greatest protective effect among the three antioxidants tested. In contrast, buthionine sulfoximine, the glutathione synthesis inhibitor, enhanced the safrole-induced oxidative damage, as evidenced by the elevation of LHP and 8-OH-dG levels on day 3 (P<0.05). These findings demonstrate that safrole treatment induces oxidative damage in rat hepatic tissue, and glutathione plays an important protective role. This oxidative damage may be involved in the hepatocarcinogenic effect of safrole.
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Affiliation(s)
- T Y Liu
- Department of Medical Research, Veterans General Hospital-Taipei, Institute of Pharmacology, National Yang-Ming University, Taiwan, Republic of China
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40
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Affiliation(s)
- C Ioannides
- Molecular Toxicology Group, School of Biological Sciences, University of Surrey, Guildford, UK
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41
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Moorthy B, Sriram P, Randerath E, Randerath K. Effects of cytochrome P450 inducers on tamoxifen genotoxicity in female mice in vivo. Biochem Pharmacol 1997; 53:663-9. [PMID: 9113085 DOI: 10.1016/s0006-2952(96)00875-1] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/04/2023]
Abstract
We recently reported that administration of the antiestrogen tamoxifen (TAM) gives rise to two groups of DNA adducts in female mouse liver in vivo, as measured by 32P-postlabeling, and provided evidence that 4-hydroxytamoxifen and alpha-hydroxytamoxifen are proximate carcinogenic metabolites leading to group I and group II adducts, respectively (Randerath et al., Carcinogenesis 15: 2087-2094, 1994). Because cytochrome P450 (CYP) enzymes play an important role in TAM metabolism, in this investigation we tested the hypothesis that induction of liver CYP enzymes may affect TAM metabolism profoundly, resulting in increased or decreased TAM-DNA adduct formation in vivo. To this end, we treated female ICR mice with TAM either alone or in combination with one of several classic CYP inducers, i.e. phenobarbital (PB), beta-naphthoflavone (BNF), and pregnenolone-16 alpha-carbonitrile (PCN), and determined the levels of 32P-postlabeled TAM-DNA adducts and the activities of several CYP-dependent enzymes. Each of the inducers greatly diminished levels of group II, but did not affect group I adducts. TAM elicited induction of benzphetamine N-demethylase activity in liver, while activities of other enzymes were not affected. TAM, when given in combination with BNF, elicited a synergistic induction of ethoxyresorufin O-deethylase (EROD) (CYP1A1) and methoxyresorufin O-demethylase (MROD) (CYP1A2) activities. Likewise, PCN given along with TAM caused synergistic induction of EROD and ethylmorphine N-demethylase activities. There was no synergism between PB and TAM, however. Overall, the results further support the existence of two pathways of TAM metabolism to DNA-reactive electrophiles and strongly suggest that the classic CYP inducers tested enhance detoxication of TAM to non-genotoxic metabolites.
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Affiliation(s)
- B Moorthy
- Department of Pharmacology, Baylor College of Medicine, Houston, TX 77030, USA
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42
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Manteiga R, Park DL, Ali SS. Risks associated with consumption of herbal teas. REVIEWS OF ENVIRONMENTAL CONTAMINATION AND TOXICOLOGY 1997; 150:1-30. [PMID: 8978213 DOI: 10.1007/978-1-4612-2278-1_1] [Citation(s) in RCA: 22] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/10/2023]
Abstract
Plants have been used for medicinal purposes for centuries. Health-oriented individuals are turning to herbal teas as alternatives to caffeinated beverages such as coffee, tea, and cocoa and for low-caloric supplements. The popularity of herbal tea consumption has increased significantly during the past two decades in the U.S. Hundreds of different teas made up of varied mixtures of roots, leaves, seeds, barks, or other parts of shrubs, vines, or trees are sold in health food stores. Although chemists have been characterizing toxic plant constituents for over 100 years, toxicological studies of herbal teas have been limited and, therefore, the safety of many of these products is unknown. Plants synthesize secondary metabolites that are not essential in the production of energy and whose role may be in the defense mechanisms as plant toxins to their interactions with other plants, herbivores, and parasites. Pyrrolizidine alkaloids (PAs) were among the first naturally occurring carcinogens identified in plant products, and their presence in herbal teas is a matter of public health significance. Some herbal tea mixtures and single-ingredient herbal teas have been analyzed for toxic/mutagenic potential by bioassay and chromatographic techniques. Numerous human and animal intoxications have been associated with naturally occurring components, including pyrrolizidine alkaloids, tannins, and safrole. Thus, the prevention of human exposure to carcinogens or mutagens present in herbal tea mixture extracts is crucial. Preparation of infusion drinks prepared from plants appears to concentrate biologically active compounds and is a major source of PA poisoning. The quantity and consumption over a long period of time is of major concern. It is recommended that widespread consumption of herbal infusions should be minimized until data on the levels and varieties of carcinogens, mutagens, and toxicants are made available.
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Affiliation(s)
- R Manteiga
- Department of Nutritional Sciences, University of Arizona, Tucson 85721, USA
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43
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Abstract
The effect of methoxsalen, the inhibitor of the hepatic mixed function oxidase, on the expression of liver cytochrome P450s was examined in rats. Administration of methoxsalen to rats significantly increased the hepatic content of P450 and activities of microsomal ethoxyresorufin O-deethylase (EROD), methoxyresorufin O-demethylase (MROD), pentoxyresorufin O-dealkylase (PROD), a representative activity of P4501A1, P4501A2 and P4502B1/2, respectively, in a dose-dependent manner. In contrast, there was no effect on the P4502E1 catalyzed aniline hydroxylase. In the time-course experiment, methoxsalen exhibited a biphasic effect on EROD, MROD, and PROD activities, an initial inhibitory phase was followed by a phase of induction following a single treatment. Immunoblot analysis using anti-rat liver P4501A and P4502B revealed that increase in the apoprotein levels of P4501A1/2 and P4502B1/2 by methoxsalen was consistent with those in enzyme activity levels. Levels of mRNA of P4501A1/2 and P4502B1/2 were also increased by methoxsalen in Northern blot analysis. These results demonstrated that methoxsalen acts as an inducer of the hepatic microsomal mixed function oxidase; selective induction of P4501A and P4502B families involved increases in mRNA levels.
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Affiliation(s)
- J H Gwang
- Department of Environmental Science, Chosun University, Kwangju City, South Korea
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44
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Lewis DF, Ioannides C, Parke DV. Computer graphics analysis of the interaction of alkoxy methylenedioxybenzenes with cytochromes P4501. Toxicol Lett 1995; 76:39-45. [PMID: 7701515 DOI: 10.1016/0378-4274(94)03192-4] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/26/2023]
Abstract
A quantitative structure-activity relationship (QSAR) in a homologous series of alkoxy methylenedioxybenzenes (MDBs) is reported. Measurements of molecular dimensions from computer-generated space-filling structures have provided values for the shape parameter area/depth2. These have been shown to correlate with the extent of inhibition of ethoxyresorufin O-deethylase activity by a series of MDBs. The implication of this is that the MDB nucleus fits the cytochrome P4501 substrate binding site and that this ability decreases with increase in the alkyl chain length of the alkoxy substituent. These findings are in agreement with previous results relating to the spatial dimensions of the cytochrome P4501 binding site, showing that substrate specificity can be rationalized in terms of overall molecular shape.
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Affiliation(s)
- D F Lewis
- School of Biological Sciences, University of Surrey, Guildford, UK
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45
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Chu CY, Chang JP, Wang CJ. Modulatory effect of piperine on benzo[a]pyrene cytotoxicity and DNA adduct formation in V-79 lung fibroblast cells. Food Chem Toxicol 1994; 32:373-7. [PMID: 8206433 DOI: 10.1016/0278-6915(94)90076-0] [Citation(s) in RCA: 28] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/29/2023]
Abstract
Piperine, a major component of black pepper and long peppers, has been reported previously to have an effect on the activation and deactivation of some exogenous substances. In the present study, piperine was found to promote DNA damage and cytotoxicity induced by benzo[a]pyrene (B[a]P) in cultured V-79 lung fibroblast cells. The V-79 cells were treated with a non-toxic dose of piperine (1-20 microM) plus 10 microM B[a]P, or pretreated with piperine for 30 min or 2 hr prior to the administration of 10 microM B[a]P. B[a]P cytotoxicity was potentiated significantly by piperine under each experimental condition. The relative plating efficiency (RPE) was 71% when V-79 cells were exposed to 10 microM B[a]P alone. When the culture was exposed to B[a]P plus piperine or pretreated with piperine for 30 min prior to the administration of B[a]P, the RPE values were 63 and 44% (P < 0.001), respectively. Pretreatment with piperine for 2 hr had no significant effect (P > 0.05). Furthermore, the lowest activities (P < 0.05) of glutathione S-transferase (GST) and uridine diphosphate glucuronyl transferase (UDP-GTase) of piperine-treated V-79 cells occurred 30 min to 1 hr after the piperine pretreatment. Pretreatment of V-79 cells with piperine also caused an increase in the covalent binding of B[a]P-diol-epoxide to DNA, 2.3 times greater than that of the V-79 cells without piperine treatment. These results suggest that the promotion by piperine of B[a]P-induced cytotoxicity in V-79 lung fibroblast cells is due to mechanisms that decrease the activities of GST and UDP-GTase and increase the formation of a B[a]P-DNA adduct.
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Affiliation(s)
- C Y Chu
- Institute of Biochemistry, Chung-Shan Medical and Dental College, Taichung, Taiwan, Republic of China
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46
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Ioannides C, Ayrton AD, Lewis DF, Walker R. Extrapolation of in vitro antimutagenicity to the in vivo situation: the case for anthraflavic acid. BASIC LIFE SCIENCES 1993; 61:103-10. [PMID: 8304922 DOI: 10.1007/978-1-4615-2984-2_9] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/29/2023]
Affiliation(s)
- C Ioannides
- Division of Toxicology, School of Biological Sciences, University of Surrey, Guildford, United Kingdom
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47
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Persson JO, Terelius Y, Ingelman-Sundberg M. Cytochrome P-450-dependent formation of reactive oxygen radicals: isozyme-specific inhibition of P-450-mediated reduction of oxygen and carbon tetrachloride. Xenobiotica 1990; 20:887-900. [PMID: 2122605 DOI: 10.3109/00498259009046904] [Citation(s) in RCA: 65] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022]
Abstract
1. Ethanol-inducible P450 IIE1 exhibits a high rate of oxygen consumption and oxidase activity. The enzyme is selectively distributed in the liver centrilobular area, the acinar region specifically destroyed after treatment with P450 IIE1 substrates/inducers such as ethanol, carbon tetrachloride, chloroform, N-nitrosodimethylamine and paracetamol. 2. Twenty substrates and ligands for cytochrome P450 IIB4 and P450 IIE1 were evaluated for their ability to inhibit microsomal and reconstituted NADPH-dependent oxidase activity, and the P450 IIE1-catalysed reduction of carbon tetrachloride to chloroform. Type I ligands and substrates did not inhibit the processes whereas nitrogen-containing compounds such as octylamine, cimetidine, imidazole and tryptamine inhibited NADPH oxidation and H2O2 formation in microsomes from starved and acetone-treated rats by around 50%. 3. Tryptamine, octylamine, isoniazid and p-chloroamphetamine inhibited reconstituted P450 IIE1-dependent oxidase activity with half maximal effects at 14-170 microM. 4. Isoniazid, cimetidine and tryptamine inhibited the P450 IIE1-dependent reduction of carbon tetrachloride, whereas acetone was without effect. 5. The oxygen dependency of microsomal oxidase activity exhibited high-affinity and low-affinity phases, with partial saturation at 20 microM of O2. 6. It is concluded that microsomal oxidase activity takes place at physiological concentrations of O2 and that isozyme-specific type II ligands compete with oxygen or carbon tetrachloride for reduction by P-450 haem.
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Affiliation(s)
- J O Persson
- Department of Physiological Chemistry, Karolinska Institute, Stockholm, Sweden
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48
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Ioannides C, Parke DV. The cytochrome P450 I gene family of microsomal hemoproteins and their role in the metabolic activation of chemicals. Drug Metab Rev 1990; 22:1-85. [PMID: 2199176 DOI: 10.3109/03602539008991444] [Citation(s) in RCA: 198] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022]
Affiliation(s)
- C Ioannides
- Department of Biochemistry, University of Surrey, Guildford, U.K
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49
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Rodrigues AD, Waddell PR, Ah-Sing E, Morris BA, Wolf CR, Ioannides C. Induction of the rat hepatic microsomal mixed-function oxidases by 3 imidazole-containing antifungal agents: selectivity for the cytochrome P-450IIB and P-450III families of cytochromes P-450. Toxicology 1988; 50:283-301. [PMID: 3394156 DOI: 10.1016/0300-483x(88)90045-5] [Citation(s) in RCA: 36] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/05/2023]
Abstract
Administration of the imidazole antifungal agents ketoconazole, miconazole and clotrimazole gave rise to increases in the microsomal cytochrome P-450 levels and the NADPH-dependent reduction of cytochrome c. Clotrimazole, and to a much lesser extent miconazole and ketoconazole, stimulated the dealkylation of pentoxyresorufin. All 3 agents gave rise to small, but significant increases in the O-deethylation of ethoxycoumarin and ethoxyresorufin. The antifungal-induced O-deethylation of ethoxycoumarin was much more sensitive to inhibition by metyrapone rather than by alpha-naphthoflavone. The binding of metyrapone to reduced microsomes was enhanced by treatment of animals with the 3 antifungal agents, clotrimazole being clearly the most potent. Immunoquantitation of cytochrome P-450 proteins using an ELISA procedure and employing anti-cytochrome P-450c (P-450IA1, P-448 low spin) and P-450b (P-450IIB1) antisera revealed that clotrimazole and miconazole, but not ketoconazole, induced the levels of phenobarbital-induced cytochromes P-450, while none of the antifungal agents increased the levels of cytochrome of P-448 proteins. Similar results were obtained using Western blots employing the above antibodies. On SDS-polyacrylamide gel electrophoresis microsomes derived from animals pretreated with clotrimazole showed intensification of a band at 51 kDa which was identified by Western blotting as the PCN-inducible form of cytochrome P-450 (cytochrome P-450p, P-450III family). Similar, but less pronounced intensification was seen with microsomes from animals pretreated with miconazole and ketoconazole. Furthermore, microsomes from clotrimazole- and ketoconazole-treated animals interacted with erythromycin to yield type I spectra. It is concluded that the imidazole-containing agents clotrimazole and miconazole, and to a much lesser extent ketoconazole, are potent inducers of the rat hepatic microsomal mixed-function oxidases, displaying selectivity towards the P-450IIB (phenobarbital-inducible) and P-450III (PCN-inducible) families of cytochrome P-450 proteins.
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Affiliation(s)
- A D Rodrigues
- Department of Biochemistry, University of Surrey, Guildford, U.K
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Abstract
After oral administration of piperine (170 mg/kg) to rats, the metabolites in bile and urine were examined by thin-layer chromatography, high-performance liquid chromatography and combined gas chromatography-mass spectrometry. Four metabolites of piperine, viz. piperonylic acid, piperonyl alcohol, piperonal and vanillic acid were identified in the free form in 0-96 h urine whereas only piperic acid was detected in 0-6 h bile. Based on these results, a pathway for the biotransformation of piperine in rats is proposed.
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