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Ramos R, Vale N. Dual Drug Repurposing: The Example of Saracatinib. Int J Mol Sci 2024; 25:4565. [PMID: 38674150 PMCID: PMC11050334 DOI: 10.3390/ijms25084565] [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: 03/05/2024] [Revised: 04/11/2024] [Accepted: 04/20/2024] [Indexed: 04/28/2024] Open
Abstract
Saracatinib (AZD0530) is a dual Src/Abl inhibitor initially developed by AstraZeneca for cancer treatment; however, data from 2006 to 2024 reveal that this drug has been tested not only for cancer treatment, but also for the treatment of other diseases. Despite the promising pre-clinical results and the tolerability shown in phase I trials, where a maximum tolerated dose of 175 mg was defined, phase II clinical data demonstrated a low therapeutic action against several cancers and an elevated rate of adverse effects. Recently, pre-clinical research aimed at reducing the toxic effects and enhancing the therapeutic performance of saracatinib using nanoparticles and different pharmacological combinations has shown promising results. Concomitantly, saracatinib was repurposed to treat Alzheimer's disease, targeting Fyn. It showed great clinical results and required a lower daily dose than that defined for cancer treatment, 125 mg and 175 mg, respectively. In addition to Alzheimer's disease, this Src inhibitor has also been studied in relation to other health conditions such as pulmonary and liver fibrosis and even for analgesic and anti-allergic functions. Although saracatinib is still not approved by the Food and Drug Administration (FDA), the large number of alternative uses for saracatinib and the elevated number of pre-clinical and clinical trials performed suggest the huge potential of this drug for the treatment of different kinds of diseases.
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Affiliation(s)
- Raquel Ramos
- PerMed Research Group, Center for Health Technology and Services Research (CINTESIS), Rua Doutor Plácido da Costa, 4200-450 Porto, Portugal;
- CINTESIS@RISE, Faculty of Medicine, University of Porto, Alameda Professor Hernâni Monteiro, 4200-319 Porto, Portugal
| | - Nuno Vale
- PerMed Research Group, Center for Health Technology and Services Research (CINTESIS), Rua Doutor Plácido da Costa, 4200-450 Porto, Portugal;
- CINTESIS@RISE, Faculty of Medicine, University of Porto, Alameda Professor Hernâni Monteiro, 4200-319 Porto, Portugal
- Department of Community Medicine, Health Information and Decision (MEDCIDS), Faculty of Medicine, University of Porto, Rua Doutor Plácido da Costa, 4200-450 Porto, Portugal
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Weatherly S, Lyons R. The photolytic conversion of 4-nonylphenol to 4-nonylcatechol within snowpack of the Palisade Glacier, Sierra Nevada, CA, USA. THE SCIENCE OF THE TOTAL ENVIRONMENT 2023; 876:162835. [PMID: 36924957 DOI: 10.1016/j.scitotenv.2023.162835] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/04/2023] [Revised: 03/09/2023] [Accepted: 03/09/2023] [Indexed: 06/18/2023]
Abstract
4-Nonylphenol (4-NP), an environmental pollutant with potent ecotoxicological effects, has been discovered in significant quantities in glacial ice and snow of the Sierra Nevada Mountain Range, CA. Photolysis of 4-NP is suspected to be a major, if not the sole, breakdown pathway in snow. However, the photolysis process has yet to be characterized in detail for this unique environment. This study therefore seeks to (1) confirm the presence of the major photolysis product within snowpack and snowmelt samples from the Palisade Glacier, CA, (2) determine key photolysis parameters through laboratory assays in snow analogs, and (3) compute environmentally relevant photolysis rates in snowpack via a spectral solar irradiance model parameterized for the Palisade Glacier. The primary photooxidation product of 4-NP, 4-nonylcatechol (4-NC), was synthesized and characterized by NMR and GC-MS for use as a reference standard in the detection of 4-NC in environmental samples. 4-NP was detected in all snowpack (n = 4) and snowmelt (n = 5) samples, with concentrations of 1.05 (± 0.11) μg L-1 and 1.28 (± 0.12) μg L-1, respectively. 4-NC was detected in all snowmelt outflow samples and all but one snow samples (88 % detection frequency) but was below the limit of quantification for the given method. All samples were collected during a sampling regime at the Palisade Glacier in August of 2021. Quantum yields of photolysis at the 277 nm absorption band were determined to be 0.36 (±0.06) and 0.21 (±0.06) in ultrapure water and liquid snow, respectively. Under clear sky conditions at the Palisade Glacier, half-lives for 4-NP are estimated to range from 235 to 251 h (9.8-10.5 days) based on assays conducted in liquid snowmelt and irradiance modeling. These results suggest that the photolysis of 4-NP, and hence the production of 4-NC, is occurring at significant rates within the snowpack where 4-NC is inevitably released to downstream catchment areas via snowmelt. 4-NC is significantly more toxic than its precursor, thereby raising amplified concerns for downstream human and wildlife populations. Furthermore, the ubiquity of 4-NP among the Earth's environments presents this as an issue of potentially global concern.
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Affiliation(s)
- Shaun Weatherly
- University of Redlands, 1200 E Colton Ave., Redlands, CA 92373, United States of America.
| | - Rebecca Lyons
- University of Redlands, 1200 E Colton Ave., Redlands, CA 92373, United States of America
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You Y, Wang X, Ma K, Li J, Peng Y, Zheng J. Metabolic Activation of Atomoxetine Mediated by Cytochrome P450 2D6. Chem Res Toxicol 2021; 34:2135-2144. [PMID: 34431675 DOI: 10.1021/acs.chemrestox.1c00216] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Atomoxetine (ATX) is a neurological drug widely used for the treatment of attention deficit-hyperactivity disorder. Liver injury has been documented in patients administered ATX. The mechanism of ATX's toxic action is less clear. This study is aimed to characterize reactive metabolites of ATX in vitro and in vivo to assist our understanding of the mechanisms of ATX hepatotoxicity. A hydroxylated metabolite, along with an O-dealkylation metabolite, was found in ATX-supplemented rat liver microsome incubations. Additionally, two glutathione (GSH) conjugates and two N-acetylcysteine (NAC) conjugates were observed in rat liver microsome incubations containing ATX, NADPH, and GSH or NAC. The corresponding GSH conjugates and NAC conjugates were found in bile and urine of ATX-treated rats, respectively. Recombinant P450 enzyme incubation study demonstrated that CYP2D6 dominated the metabolic activation of ATX. The insights gained from this study may be of assistance to illuminate the mechanisms of ATX-induced hepatotoxicity.
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Affiliation(s)
- Yutong You
- Wuya College of Innovation, Shenyang Pharmaceutical University, Shenyang, Liaoning 110016, P.R. China
| | - Xu Wang
- Wuya College of Innovation, Shenyang Pharmaceutical University, Shenyang, Liaoning 110016, P.R. China
| | - Kaiqi Ma
- Wuya College of Innovation, Shenyang Pharmaceutical University, Shenyang, Liaoning 110016, P.R. China
| | - Jiaru Li
- Wuya College of Innovation, Shenyang Pharmaceutical University, Shenyang, Liaoning 110016, P.R. China
| | - Ying Peng
- Wuya College of Innovation, Shenyang Pharmaceutical University, Shenyang, Liaoning 110016, P.R. China
| | - Jiang Zheng
- Wuya College of Innovation, Shenyang Pharmaceutical University, Shenyang, Liaoning 110016, P.R. China
- State Key Laboratory of Functions and Applications of Medicinal Plants, Key Laboratory of Pharmaceutics of Guizhou Province, Guizhou Medical University, Guiyang, Guizhou 550025, P.R. China
- Key Laboratory of Environmental Pollution, Monitoring and Disease Control, Ministry of Education, Guizhou Medical University, Guiyang, Guizhou 550025, P. R. China
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Cui T, Wang Q, Tian X, Zhang K, Peng Y, Zheng J. Piperine Is a Mechanism-Based Inactivator of CYP3A. Drug Metab Dispos 2019; 48:123-134. [PMID: 31748224 DOI: 10.1124/dmd.119.088955] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/07/2019] [Accepted: 11/05/2019] [Indexed: 11/22/2022] Open
Abstract
Piperine (PPR) is the representative alkaloid component of the piper species (family: Piperaceae). Our rapid screening study found PPR caused time-dependent inhibition of cytochrome P450s (CYP) 3A and 2D6, and CYP3A was inactivated the most. Further study demonstrated that PPR is a time-, concentration-, and NADPH-dependent inhibitor of CYP3A, and significant loss (49.5% ± 3.9%) of CYP3A activity was observed after 20minute incubations with 80 μM PPR at 37°C. The values of K I and k inact were 30.7 μM and 0.041 minutes-1, respectively. CYP3A competitive inhibitor ketoconazole showed protective effect against the enzyme inactivation. Superoxide dismutase/catalase and GSH displayed minor protection against the PPR-caused enzyme inactivation. Ferricyanide partially reduced the enzyme inhibition by PPR. Additionally, NADPH-dependent formation of reactive metabolites from PPR were found in human liver microsomal incubation mixtures. An ortho-quinone intermediate was trapped by NAC in microsomal incubations with PPR. DM-PPR, demethylene metabolite of PPR, showed weak enzyme inactivation relative to that caused by PPR. It appears that both carbene and ortho-quinone intermediates were involved in the inactivation of CYP3A caused by PPR. SIGNIFICANCE STATEMENT: CYP3A subfamily members (mainly CYP3A4 and CYP3A5) play a critical role in drug metabolism. Piperine (PPR), a methylenedioxyphenyl derivative combined with an unsaturated ketone, is the major active ingredient of pepper. PPR revealed time-, concentration-, and NADPH-dependent inhibitory effect on CYP3A. Carbene and quinone metabolites were both involved in the observed CYP3A inactivation by PPR. Apparently, the unsaturated ketone moiety did not participate in the enzyme inactivation. The present study sounds an alert of potential risk for food-drug interactions.
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Affiliation(s)
- Tiantian Cui
- State Key Laboratory of Functions and Applications of Medicinal Plants, Key Laboratory of Pharmaceutics of Guizhou Province, and Key Laboratory of Environmental Pollution Monitoring and Disease Control, Ministry of Education, Guizhou Medical University, Guiyang, P. R. China(J.Z.); Wuya College of Innovation, Shenyang Pharmaceutical University, Shenyang, Liaoning, P. R. China(T.C., Q.W., X.T., K.Z., Y.P., J.Z.)
| | - Qian Wang
- State Key Laboratory of Functions and Applications of Medicinal Plants, Key Laboratory of Pharmaceutics of Guizhou Province, and Key Laboratory of Environmental Pollution Monitoring and Disease Control, Ministry of Education, Guizhou Medical University, Guiyang, P. R. China(J.Z.); Wuya College of Innovation, Shenyang Pharmaceutical University, Shenyang, Liaoning, P. R. China(T.C., Q.W., X.T., K.Z., Y.P., J.Z.)
| | - Xiaoxiao Tian
- State Key Laboratory of Functions and Applications of Medicinal Plants, Key Laboratory of Pharmaceutics of Guizhou Province, and Key Laboratory of Environmental Pollution Monitoring and Disease Control, Ministry of Education, Guizhou Medical University, Guiyang, P. R. China(J.Z.); Wuya College of Innovation, Shenyang Pharmaceutical University, Shenyang, Liaoning, P. R. China(T.C., Q.W., X.T., K.Z., Y.P., J.Z.)
| | - Kehan Zhang
- State Key Laboratory of Functions and Applications of Medicinal Plants, Key Laboratory of Pharmaceutics of Guizhou Province, and Key Laboratory of Environmental Pollution Monitoring and Disease Control, Ministry of Education, Guizhou Medical University, Guiyang, P. R. China(J.Z.); Wuya College of Innovation, Shenyang Pharmaceutical University, Shenyang, Liaoning, P. R. China(T.C., Q.W., X.T., K.Z., Y.P., J.Z.)
| | - Ying Peng
- State Key Laboratory of Functions and Applications of Medicinal Plants, Key Laboratory of Pharmaceutics of Guizhou Province, and Key Laboratory of Environmental Pollution Monitoring and Disease Control, Ministry of Education, Guizhou Medical University, Guiyang, P. R. China(J.Z.); Wuya College of Innovation, Shenyang Pharmaceutical University, Shenyang, Liaoning, P. R. China(T.C., Q.W., X.T., K.Z., Y.P., J.Z.)
| | - Jiang Zheng
- State Key Laboratory of Functions and Applications of Medicinal Plants, Key Laboratory of Pharmaceutics of Guizhou Province, and Key Laboratory of Environmental Pollution Monitoring and Disease Control, Ministry of Education, Guizhou Medical University, Guiyang, P. R. China(J.Z.); Wuya College of Innovation, Shenyang Pharmaceutical University, Shenyang, Liaoning, P. R. China(T.C., Q.W., X.T., K.Z., Y.P., J.Z.)
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Liu Y, Peng Y, Zhang Z, Guo X, Ji M, Zheng J. In vitro and in vivo studies of the metabolic activation of chelidonine. Chem Biol Interact 2019; 308:155-163. [PMID: 31102647 DOI: 10.1016/j.cbi.2019.05.012] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/23/2018] [Revised: 04/18/2019] [Accepted: 05/08/2019] [Indexed: 11/27/2022]
Abstract
Chelidonium majus L. is a herbal medicine widely employed in Europe and Western Asia. Chelidonine (CHE) is a major constituent of the herb and has been reported to be an inhibitor of the cytochrome P450 enzymes (CYP). The major objective of the present study was to study the metabolic pathways of CHE in order to identify potential reactive metabolites responsible for the enzyme inhibition. Three oxidative metabolites (M1-M3) were detected in human liver microsomal incubations after exposure to CHE. M1 and M2 were two isomers of catechol derivatives, and M3 was a dicatechol compound. The M1-M3 metabolites were also observed in bile of rats given CHE. A total of five glutathione (GSH) conjugates (M4-M8) were detected in microsomes containing CHE, GSH, and NADPH. Moreover, M4 and M6 originated from M1, M5 and M7 resulted from M2, and M8 was a M3-derived GSH conjugate. Three biliary CHE-derived GSH conjugates (M4, M5 and M8) were found in CHE-treated rats. This indicates that CHE was bioactivated to ortho-quinone derivatives both in vitro and in vivo. Recombinant P450 enzyme incubations demonstrated that the CYPs3A4, 1A2, 2C19 and 2D6 were mainly involved in metabolic activation of CHE. This study generated data that may be useful in understanding possible mechanisms of CHE-induced P450 inhibition.
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Affiliation(s)
- Yuyang Liu
- College of Plant Protection, Shenyang Agricultural University, Shenyang, Liaoning, 110161, PR China
| | - Ying Peng
- Wuya College of Innovation, Shenyang Pharmaceutical University, Shenyang, Liaoning, 110016, PR China
| | - Zhengyu Zhang
- Wuya College of Innovation, Shenyang Pharmaceutical University, Shenyang, Liaoning, 110016, PR China
| | - Xiucai Guo
- Wuya College of Innovation, Shenyang Pharmaceutical University, Shenyang, Liaoning, 110016, PR China
| | - Mingshan Ji
- College of Plant Protection, Shenyang Agricultural University, Shenyang, Liaoning, 110161, PR China.
| | - Jiang Zheng
- State Key Laboratory of Functions and Applications of Medicinal Plants, Key Laboratory of Pharmaceutics of Guizhou Province, Guizhou Medical University, Guiyang, Guizhou, 550004, PR China; Wuya College of Innovation, Shenyang Pharmaceutical University, Shenyang, Liaoning, 110016, PR China.
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Chen Y, Yu J, Wang X, Li H, Mao X, Peng Y, Zheng J. Characterization of glutathione conjugates derived from reactive metabolites of seven silymarin isomers. Xenobiotica 2019; 49:1269-1278. [PMID: 30489204 DOI: 10.1080/00498254.2018.1549340] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
Abstract
1. Silymarin refers to a class of flavonoid lignans occurring in the fruits and seeds of the Silybum manalttlm (L). Gaertn, and is widely used in dietary supplements. 2. The main active ingredients of silymarin are silychristins A and B, silydianin, silybins A and B, and isosilybins A and B. However, the metabolism of silymarin has never been investigated. The major objectives of the present study were to investigate the metabolic pathways of silymarin isomers and to identify reactive metabolites. 3. Fourteen glutathione (GSH) conjugates were detected in rat/human liver microsomes incubations containing NADPH, GSH and seven individual isomers. Seven GSH conjugates (M1-M7) resulted from demethylated silymarin. M8-M14 originated from hydroxylated silymarin. Moreover, we found that GSH was probably conjugated on either ring A or ring E of silymarin based on the mass spectrometric fragments. In addition, recombinant enzyme incubation experiments demonstrated that CYP3A4 was the predominant P450 responsible for the metabolism of silymarin. 4. Several P450 enzymes were reportedly inactivated by some of bioactive constituents of silymarin to some extent. Our findings facilitate the understanding of mechanisms of the reported inactivation of P450 enzymes induced by silymarin.
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Affiliation(s)
- Yan Chen
- c Wuya College of Innovation, Shenyang Pharmaceutical University , Shenyang , Liaoning , P. R. China
| | - Jing Yu
- c Wuya College of Innovation, Shenyang Pharmaceutical University , Shenyang , Liaoning , P. R. China
| | - Xu Wang
- c Wuya College of Innovation, Shenyang Pharmaceutical University , Shenyang , Liaoning , P. R. China
| | - Hui Li
- c Wuya College of Innovation, Shenyang Pharmaceutical University , Shenyang , Liaoning , P. R. China
| | - Xu Mao
- c Wuya College of Innovation, Shenyang Pharmaceutical University , Shenyang , Liaoning , P. R. China
| | - Ying Peng
- c Wuya College of Innovation, Shenyang Pharmaceutical University , Shenyang , Liaoning , P. R. China
| | - Jiang Zheng
- a State Key Laboratory of Functions and Applications of Medicinal Plants, Pharmaceutics of Guizhou Province, Guizhou Medical University , Guiyang , Guizhou , P. R. China.,b Key Laboratory of Pharmaceutics of Guizhou Province, Guizhou Medical University , Guiyang , Guizhou , P. R. China.,c Wuya College of Innovation, Shenyang Pharmaceutical University , Shenyang , Liaoning , P. R. China
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Mao X, Hu Z, Wang Q, Zhang N, Zhou S, Peng Y, Zheng J. Nitidine Chloride Is a Mechanism-Based Inactivator of CYP2D6. Drug Metab Dispos 2018; 46:1137-1145. [PMID: 29773554 DOI: 10.1124/dmd.117.079780] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/05/2017] [Accepted: 05/11/2018] [Indexed: 12/11/2022] Open
Abstract
Nitidine chloride (NC) is a benzophenanthridine alkaloid isolated from the roots of Zanthoxylum nitidum (Roxb.) DC, a widely used traditional herbal medicine. Several reports have revealed NC's multiple pharmacologic properties. The inhibitory effects of NC on human cytochrome P450 enzymes were investigated in the present study. We found that NC caused time- and concentration-dependent inhibition of CYP2D6, and more than 50% of CYP2D6 activity was suppressed after a 15-minute incubation with NC at 100 μM in the primary incubation mixtures, with KI of 4.36 μM, kinact of 0.052 minute-1, and a partition ratio of approximately 290. Moreover, the loss of CYP2D6 activity required the presence of NADPH. Superoxide dismutase/catalase and glutathione showed minor protection against the NC-induced enzyme inhibition. Quinidine as a competitive inhibitor of CYP2D6 slowed down the inactivation by NC. Trapping experiments using N-acetylcysteine demonstrated that quinone and/or carbene intermediate(s) were/was generated in human liver microsomal incubations with NC. In addition, potassium ferricyanide prevented the enzyme from the inactivation mediated by NC, which provided evidence that inhibition of CYP2D6 resulted from heme destruction by the formation of a carbene-iron complex. CYP1A2 was found to be the major enzyme involved in the generation of NC quinone metabolites. In conclusion, NC is a mechanism-based inactivator of CYP2D6. The generation of a carbene intermediate might be mainly responsible for the enzyme inactivation.
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Affiliation(s)
- Xu Mao
- Wuya College of Innovation, Shenyang Pharmaceutical University, Shenyang, Liaoning, P. R. China (X.M., Z.H., Q.W., N.Z., S.Z., Y.P., J.Z.); State Key Laboratory of Functions and Applications of Medicinal Plants, Key Laboratory of Pharmaceutics of Guizhou Province and Guizhou Medical University, Guiyang, Guizhou, P. R. China (J.Z.)
| | - Zixia Hu
- Wuya College of Innovation, Shenyang Pharmaceutical University, Shenyang, Liaoning, P. R. China (X.M., Z.H., Q.W., N.Z., S.Z., Y.P., J.Z.); State Key Laboratory of Functions and Applications of Medicinal Plants, Key Laboratory of Pharmaceutics of Guizhou Province and Guizhou Medical University, Guiyang, Guizhou, P. R. China (J.Z.)
| | - Qian Wang
- Wuya College of Innovation, Shenyang Pharmaceutical University, Shenyang, Liaoning, P. R. China (X.M., Z.H., Q.W., N.Z., S.Z., Y.P., J.Z.); State Key Laboratory of Functions and Applications of Medicinal Plants, Key Laboratory of Pharmaceutics of Guizhou Province and Guizhou Medical University, Guiyang, Guizhou, P. R. China (J.Z.)
| | - Na Zhang
- Wuya College of Innovation, Shenyang Pharmaceutical University, Shenyang, Liaoning, P. R. China (X.M., Z.H., Q.W., N.Z., S.Z., Y.P., J.Z.); State Key Laboratory of Functions and Applications of Medicinal Plants, Key Laboratory of Pharmaceutics of Guizhou Province and Guizhou Medical University, Guiyang, Guizhou, P. R. China (J.Z.)
| | - Shenzhi Zhou
- Wuya College of Innovation, Shenyang Pharmaceutical University, Shenyang, Liaoning, P. R. China (X.M., Z.H., Q.W., N.Z., S.Z., Y.P., J.Z.); State Key Laboratory of Functions and Applications of Medicinal Plants, Key Laboratory of Pharmaceutics of Guizhou Province and Guizhou Medical University, Guiyang, Guizhou, P. R. China (J.Z.)
| | - Ying Peng
- Wuya College of Innovation, Shenyang Pharmaceutical University, Shenyang, Liaoning, P. R. China (X.M., Z.H., Q.W., N.Z., S.Z., Y.P., J.Z.); State Key Laboratory of Functions and Applications of Medicinal Plants, Key Laboratory of Pharmaceutics of Guizhou Province and Guizhou Medical University, Guiyang, Guizhou, P. R. China (J.Z.)
| | - Jiang Zheng
- Wuya College of Innovation, Shenyang Pharmaceutical University, Shenyang, Liaoning, P. R. China (X.M., Z.H., Q.W., N.Z., S.Z., Y.P., J.Z.); State Key Laboratory of Functions and Applications of Medicinal Plants, Key Laboratory of Pharmaceutics of Guizhou Province and Guizhou Medical University, Guiyang, Guizhou, P. R. China (J.Z.)
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Affiliation(s)
| | | | - Jiang Zheng
- Key
Laboratory of Pharmaceutics of Guizhou Province, Guizhou Medical University, Guiyang, Guizhou 550004, P. R. China
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Chi M, Peng Y, Zheng J. Characterization of glutathione conjugates derived from reactive metabolites of bakuchiol. Chem Biol Interact 2015; 244:178-86. [PMID: 26712081 DOI: 10.1016/j.cbi.2015.12.009] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/12/2015] [Revised: 11/26/2015] [Accepted: 12/17/2015] [Indexed: 10/22/2022]
Abstract
Bakuchiol belongs to a family of monoterpene phenols occurring in plant Psoralea corylifolia L., a traditional herbal medicine. Bakuchiol has also demonstrated multiple pharmacologic activities. However, metabolism of bakuchiol had never been investigated. The major objective of the present study was to study the metabolic pathways of bakuchiol in order to identify potential reactive metabolites. A total of five glutathione (GSH) conjugates (M1-M5) were detected in rat/human liver microsomes containing NADPH, GSH, and bakuchiol. M1 and M2 resulted from GSH conjugated on the phenol ring. M3, M4, and M5 were derived from GSH adducted on the side chain. The results displayed that bakuchiol can be bioactivated by oxidation of the phenol moiety to the corresponding ortho-quinone and by epoxidation of the aliphatic side chain to epoxide metabolites. No bakuchiol-derived GSH conjugates were detected in urine of rats given bakuchiol, but six corresponding cysteinylglycine (Cys-Gly) conjugates and mercapturic acids were observed instead. A 2'-iodoxybenzoic acid-mediated oxidation reaction of bakuchiol in the presence of GSH produced M1 and M2, and m-chloroperoxybenzoicacid-mediated oxidation of bakuchiol trapped with GSH generated M3 and M4. The four synthetic metabolites were detected in microsomal incubations. In addition, recombinant P450 enzyme incubations showed that CYP 1A2 was the predominant P450 responsible for the metabolism of bakuchiol. In summary, our results demonstrated that bakuchiol can be bioactivated to quinone and epoxide metabolites. These findings facilitate the understanding of the mechanisms of bakuchiol-induced cytotoxicity.
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Affiliation(s)
- Meina Chi
- College of Pharmacy, Shenyang Pharmaceutical University, Shenyang, Liaoning, 110016, PR China
| | - Ying Peng
- College of Pharmacy, Shenyang Pharmaceutical University, Shenyang, Liaoning, 110016, PR China.
| | - Jiang Zheng
- Key Laboratory of Structure-Based Drug Design & Discovery of Ministry of Education, Shenyang Pharmaceutical University, Shenyang, Liaoning, 110016, PR China; Center for Developmental Therapeutics, Seattle Children's Research Institute, Division of Gastroenterology and Hepatology, Department of Pediatrics, University of Washington School of Medicine, Seattle, WA 98101, USA.
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Mao X, Peng Y, Zheng J. In Vitro and In Vivo Characterization of Reactive Intermediates of Corynoline. Drug Metab Dispos 2015; 43:1491-8. [PMID: 26261285 DOI: 10.1124/dmd.115.065813] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/10/2015] [Accepted: 08/04/2015] [Indexed: 11/22/2022] Open
Abstract
Corynoline is a 1,3-benzodioxole-containing isoquinoline alkaloid isolated from Corydalis bugeana Turcz., a traditional herbal medicine. Corynoline has reportedly demonstrated multiple pharmacologic properties. Previous studies have also shown that corynoline induced cytotoxicity and inhibited cytochrome P450 (CYP) enzymes, but the mechanisms of the adverse effects remain unknown. The major objective of the present study was to identify reactive metabolites of corynoline responsible for the cytotoxicity and enzyme inhibition. Three oxidative metabolites (M1-M3) were detected by liquid chromatography-tandem mass spectrometry in rat liver microsomal incubations after exposure to corynoline. M1 and M2 were two isomers of catechol derivatives, and M3 was a di-catechol. The M1-M3 metabolites were also observed in urine of rats given corynoline. A total of four N-acetylcysteine (NAC) conjugates (M4-M7) were detected in microsomes containing corynoline, NAC, and NADPH. Apparently, M4 and M5 were derived from M1, M6 resulted from M2, and M7 was a M3-derived NAC conjugate. This indicates that corynoline was bioactivated to ortho-quinone derivatives. No corynoline-derived NAC conjugates (M4-M7) were detected in urine of rats given corynoline; however, three corresponding cysteinylglycine conjugates (M8-M10) were observed instead. Recombinant P450 enzyme incubations demonstrated that the CYPs 2C9, 3A4, and 2C19 were mainly involved in metabolic activation of corynoline. The metabolism study facilitates the understanding of corynoline-induced cytotoxicity and P450 enzyme inhibition.
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Affiliation(s)
- Xu Mao
- School of Pharmacy (X.M., Y.P.), Key Laboratory of Structure-Based Drug Design & Discovery of Ministry of Education (J.Z.), Shenyang Pharmaceutical University, Shenyang, Liaoning, P. R. China; and Center for Developmental Therapeutics, Seattle Children's Research Institute, Division of Gastroenterology and Hepatology, Department of Pediatrics, University of Washington School of Medicine, Seattle, Washington (J.Z.)
| | - Ying Peng
- School of Pharmacy (X.M., Y.P.), Key Laboratory of Structure-Based Drug Design & Discovery of Ministry of Education (J.Z.), Shenyang Pharmaceutical University, Shenyang, Liaoning, P. R. China; and Center for Developmental Therapeutics, Seattle Children's Research Institute, Division of Gastroenterology and Hepatology, Department of Pediatrics, University of Washington School of Medicine, Seattle, Washington (J.Z.)
| | - Jiang Zheng
- School of Pharmacy (X.M., Y.P.), Key Laboratory of Structure-Based Drug Design & Discovery of Ministry of Education (J.Z.), Shenyang Pharmaceutical University, Shenyang, Liaoning, P. R. China; and Center for Developmental Therapeutics, Seattle Children's Research Institute, Division of Gastroenterology and Hepatology, Department of Pediatrics, University of Washington School of Medicine, Seattle, Washington (J.Z.)
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Deng P, Zhong D, Nan F, Liu S, Li D, Yuan T, Chen X, Zheng J. Evidence for the bioactivation of 4-nonylphenol to quinone methide and ortho-benzoquinone metabolites in human liver microsomes. Chem Res Toxicol 2010; 23:1617-28. [PMID: 20843008 DOI: 10.1021/tx100223h] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/18/2023]
Abstract
4-Nonylphenol (4-NP) is a well-known toxic environmental contaminant. The major objective of the present study was to identify reactive metabolites of 4-NP. Following incubations of 4-NP with NADPH- and GSH-supplemented human liver microsomes, 6 GSH conjugates, along with 19 oxidized metabolites, were detected by UPLC/Q-TOF mass spectrometry utilizing the mass defect filter method. Several authentic key metabolite standards were chemically synthesized for structural identification. Three GSH conjugates were found to derive from quinone methide intermediates, and the other three resulted from ortho-benzoquinone intermediates. Conjugation of the quinone methides with GSH produced benzylic-orientated GSH conjugates by 1,6-addition, while the reaction of the ortho-benzoquinone intermediates offered aromatic-orientated GSH conjugates. The conversion of 4-NP to the quinone methides and ortho-hydroquinones required cytochromes P450, specifically CYPs1A2, 2C19, 2D6, 2E1, and 3A4, while the oxidation of ortho-benzohydroquinones to the corresponding benzoquinones was apparently independent of microsomal enzymes. The ortho-benzoquinone derived from 4-NP was isomerized to the corresponding hydroxyquinone methide, and the former dominated the latter at a rate of approximately 20:1. The findings of the quinone methide and benzoquinone metabolites intensified the concern on the impact of 4-NP exposure on human health.
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Affiliation(s)
- Pan Deng
- Shanghai Institute of Materia Medica, Chinese Academy of Sciences, Shanghai, China
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