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Dahleh MMM, Bortolotto VC, Boeira SP, Segat HJ, Guerra GP, Prigol M. From gains to gaps? How Selective Androgen Receptor Modulator (SARM) YK11 impact hippocampal function: In silico, in vivo, and ex vivo perspectives. Chem Biol Interact 2024; 394:110971. [PMID: 38521455 DOI: 10.1016/j.cbi.2024.110971] [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: 01/23/2024] [Revised: 03/18/2024] [Accepted: 03/20/2024] [Indexed: 03/25/2024]
Abstract
Selective Androgen Receptor Modulators (SARMs), particularly (17α,20E)-17,20-[(1-methoxyethylidene)bis(oxy)]-3-oxo-19-norpregna-4,20-diene-21-carboxylic-acid-methyl-ester (YK11), are increasingly popular among athletes seeking enhanced performance. Serving as an Androgen Receptor (AR) agonist, YK11 stimulates muscle growth while inhibiting myostatin. Our study delved into the impact of YK11 on the rat hippocampus, analyzing potential alterations in neurochemical mechanisms and investigating its synergistic effects with exercise (EXE), based on the strong relationship between SARM users and regular exercise. Utilizing Physiologically Based Pharmacokinetic (PBPK) modeling, we demonstrated YK11 remarkable brain permeability, with molecular docking analysis revealing YK11 inhibitory effects on 5-alpha-reductase type II (5αR2), suggesting high cell bioavailability. Throughout a 5-week experiment, we divided the animals into the following groups: Control, YK11 (0.35 g/kg), EXE (swimming exercise), and EXE + YK11. Our findings showed that YK11 displayed a high binding affinity with AR in the hippocampus, influencing neurochemical function and modulating aversive memory consolidation, including the downregulation of the BDNF/TrkB/CREB signaling, irrespective of EXE combination. In the hippocampus, YK11 increased pro-inflammatory IL-1β and IL-6 cytokines, while reducing anti-inflammatory IL-10 levels. However, the EXE + YK11 group counteracted IL-6 effects and elevated IL-10. Analysis of apoptotic proteins revealed heightened p38 MAPK activity in response to YK11-induced inflammation, initiating the apoptotic cascade involving Bax/Bcl-2/cleaved caspase-3. Notably, the EXE + YK11 group mitigated alterations in Bcl-2 and cleaved caspase-3 proteins. In conclusion, our findings suggest that YK11, at anabolic doses, significantly alters hippocampal neurochemistry, leading to impairments in memory consolidation. This underscore concerns about the misuse risks of SARMs among athletes and challenges common perceptions of their minimal side effects.
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Affiliation(s)
- Mustafa Munir Mustafa Dahleh
- Laboratory of Pharmacological and Toxicological Evaluations Applied to Bioactive Molecules, LaftamBio, Federal University of Pampa, Itaqui, CEP 97650-000, RS, Brazil
| | - Vandreza Cardoso Bortolotto
- Laboratory of Pharmacological and Toxicological Evaluations Applied to Bioactive Molecules, LaftamBio, Federal University of Pampa, Itaqui, CEP 97650-000, RS, Brazil
| | - Silvana Peterini Boeira
- Laboratory of Pharmacological and Toxicological Evaluations Applied to Bioactive Molecules, LaftamBio, Federal University of Pampa, Itaqui, CEP 97650-000, RS, Brazil
| | - Hecson Jesser Segat
- Laboratory of Pharmacological and Toxicological Evaluations Applied to Bioactive Molecules, LaftamBio, Federal University of Pampa, Itaqui, CEP 97650-000, RS, Brazil
| | - Gustavo Petri Guerra
- Laboratory of Pharmacological and Toxicological Evaluations Applied to Bioactive Molecules, LaftamBio, Federal University of Pampa, Itaqui, CEP 97650-000, RS, Brazil
| | - Marina Prigol
- Laboratory of Pharmacological and Toxicological Evaluations Applied to Bioactive Molecules, LaftamBio, Federal University of Pampa, Itaqui, CEP 97650-000, RS, Brazil.
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Sevrioukova IF. Interaction of CYP3A4 with caffeine: First insights into multiple substrate binding. J Biol Chem 2023; 299:105117. [PMID: 37524132 PMCID: PMC10470200 DOI: 10.1016/j.jbc.2023.105117] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/08/2023] [Revised: 07/18/2023] [Accepted: 07/27/2023] [Indexed: 08/02/2023] Open
Abstract
Human cytochrome P450 3A4 (CYP3A4) is a major drug-metabolizing enzyme that shows extreme substrate promiscuity. Moreover, its large and malleable active site can simultaneously accommodate several substrate molecules of the same or different nature, which may lead to cooperative binding and allosteric behavior. Due to difficulty of crystallization of CYP3A4-substrate complexes, it remains unknown how multiple substrates can arrange in the active site. We determined crystal structures of CYP3A4 bound to three and six molecules of caffeine, a psychoactive alkaloid serving as a substrate and modulator of CYP3A4. In the ternary complex, one caffeine binds to the active site suitably for C8-hydroxylation, most preferable for CYP3A4. In the senary complex, three caffeine molecules stack parallel to the heme with the proximal ligand poised for 3-N-demethylation. However, the caffeine stack forms extensive hydrophobic interactions that could preclude product dissociation and multiple turnovers. In both complexes, caffeine is also bound in the substrate channel and on the outer surface known as a peripheral site. At all sites, aromatic stacking with the caffeine ring(s) is likely a dominant interaction, while direct and water-mediated polar contacts provide additional stabilization for the substrate-bound complexes. Protein-ligand interactions via the active site R212, intrachannel T224, and peripheral F219 were experimentally confirmed, and the latter two residues were identified as important for caffeine association. Collectively, the structural, spectral, and mutagenesis data provide valuable insights on the ligand binding mechanism and help better understand how purine-based pharmaceuticals and other aromatic compounds could interact with CYP3A4 and mediate drug-drug interactions.
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Affiliation(s)
- Irina F Sevrioukova
- Department of Molecular Biology and Biochemistry, University of California, Irvine, California, USA.
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Attar A, Altikatoglu Yapaoz M. The analysis of methylxanthine fractions obtained from Camellia sinensis cultivated in Turkey and effects on the in vitro inhibition of CYP2D6 enzyme. Biotechnol Appl Biochem 2023; 70:22-27. [PMID: 35196743 DOI: 10.1002/bab.2325] [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: 11/07/2021] [Accepted: 01/18/2022] [Indexed: 11/11/2022]
Abstract
Tea is a worldwide consumed herbal beverage and it was aimed in this study to reveal the major fractions of green and black tea in order to enlighten the in vitro inhibition potency on the well-known drug metabolizing enzyme CYP2D6 activity. Methylxanthine fractions were extracted from green and black tea and a yield of 0.265 g (1.06%) for 25 g of dried black tea and 0.302 g (1.2%) for 25 g of green tea was calculated. High-performance liquid chromatography analysis represented that the major components of the methylxanthine fractions were caffeine, theobromine, and theophylline. Methylxanthine content of black tea was 368.25 ± 4.6 μg/ml caffeine, 89.30 ± 2.3 μg/ml theobromine, and 3.40 ± 0.5 μg/ml theophylline, whereas that of green tea was 176.50 ± 3.7 μg/ml caffeine, 53.85 ± 1.4 μg/ml theobromine, and 2.06 ± 0.7 μg/ml theophylline. The results of concentration-dependent inhibition studies were 76% green tea, 75% black tea, and 55% caffeine at concentration of 10 mg/ml. The inhibition rates of green and black tea on CYP2D6 activity were 76% and 75%, respectively, where that of quinidine, the well-known inhibitor of CYP2D6, was 82%. Our results indicate that green and black tea is very likely to modify the CYP2D6 enzyme activity.
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Affiliation(s)
- Azade Attar
- Faculty of Chemical & Metallurgical Engineering, Department of Bioengineering, Yildiz Technical University, Istanbul, Turkey
| | - Melda Altikatoglu Yapaoz
- Faculty of Science and Letters, Department of Chemistry, Yildiz Technical University, Istanbul, Turkey
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Vilhelmova N, Nikolova I, Georgiev KD, Slavov IJ. In vitro antiviral activities of fruit extract from Lycium barbarum and methylxanthines extracted from Pu-erh and Bancha tea leaves. Folia Med (Plovdiv) 2022; 64:817-823. [PMID: 36876534 DOI: 10.3897/folmed.64.e68987] [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: 05/21/2021] [Accepted: 07/05/2021] [Indexed: 03/07/2023] Open
Abstract
INTRODUCTION Based on traditional medicine, many countries use various plant products (fruits, leaves and other plant parts) as food supplements or in the form of tea. The use of these plant sources has been established through the years of use and the proven benefits of their ingredients to improve human health.
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Affiliation(s)
- Neli Vilhelmova
- The Stephan Angeloff Institute of Microbiology, Bulgarian Academy of Sciences, Sofia, Bulgaria
| | - Ivanka Nikolova
- The Stephan Angeloff Institute of Microbiology, Bulgarian Academy of Sciences, Sofia, Bulgaria
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Gu X, Meng Y, Jin F, Wang L, Ma J, Wang X, Zhao Y, Shi J, Li J, Zhao Y, Tu P, Zheng J. Puerin III alleviates glucose and lipid metabolism disorders in high-fat high-sucrose diet-induced hyperlipidemic and hyperglycemic ApoE−/− mice. J Funct Foods 2022. [DOI: 10.1016/j.jff.2022.105085] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022] Open
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Wang S, Qiu Y, Gan RY, Zhu F. Chemical constituents and biological properties of Pu-erh tea. Food Res Int 2022; 154:110899. [DOI: 10.1016/j.foodres.2021.110899] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/22/2021] [Revised: 12/08/2021] [Accepted: 12/10/2021] [Indexed: 12/21/2022]
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Radeva-llieva M, Stoeva S, Hvarchanova N, Zhelev I, Georgiev KD. Influence of methylxanthines isolated from Bancha green tea on the pharmacokinetics of sildenafil in rats. Daru 2022; 30:75-84. [PMID: 35146639 PMCID: PMC9114228 DOI: 10.1007/s40199-022-00433-z] [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: 09/21/2021] [Accepted: 01/08/2022] [Indexed: 10/19/2022] Open
Abstract
BACKGROUND Sildenafil is used to treat erectile dysfunction and pulmonary arterial hypertension and is metabolized in the liver mainly by CYP3A4, thus co-administration with drugs or herbal extracts that affect CYP3A4 activity may lead to drug-drug or drug-herb interactions, respectively. The aim of the present study was to evaluate the influence of single and multiple oral doses of methylxanthine fraction, isolated from Bancha green tea leaves on the pharmacokinetics of sildenafil in rats. METHODS Rats were given sildenafil alone as well as simultaneously with methylxanthines or ketoconazole. The plasma concentrations of sildenafil were measured with high-performance liquid chromatography method with ultraviolet detection. The pharmacokinetic parameters of sildenafil were calculated by non-compartmental analysis. RESULTS Concomitant use of sildenafil with a single oral dose of methylxanthines resulted in a decrease in Cmax (p > 0.05), AUC0-t (p < 0.05) and AUC0-inf (p < 0.05), while the administration of sildenafil after methylxanthines pretreatment resulted in an increase in Cmax (p < 0.0001), AUC0-t (p < 0.0001) and AUC0-inf (p < 0.001) compared to the sildenafil group. After co-administration of sildenafil and ketoconazole, a significant increase in Cmax, AUC0-t and AUC0-inf was observed in both of the experiments. CONCLUSION Drug-herb interactions were observed when sildenafil was co-administered with Bancha methylxanthines in rats. Further in vivo studies about the potential drug interactions between sildenafil and methylxanthines, especially caffeine, are needed to clarify mechanisms underlying the observed changes in sildenafil pharmacokinetics.
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Affiliation(s)
- Maya Radeva-llieva
- grid.20501.360000 0000 8767 9052Department of Pharmacology, toxicology and pharmacotherapy, Faculty of Pharmacy, Medical University “Prof. Dr. Paraskev Stoyanov”, 84 “Tsar Osvoboditel” Blvd, 9000 Varna, Bulgaria
| | - Stanila Stoeva
- grid.20501.360000 0000 8767 9052Department of Pharmacology, toxicology and pharmacotherapy, Faculty of Pharmacy, Medical University “Prof. Dr. Paraskev Stoyanov”, 84 “Tsar Osvoboditel” Blvd, 9000 Varna, Bulgaria
| | - Nadezhda Hvarchanova
- grid.20501.360000 0000 8767 9052Department of Pharmacology, toxicology and pharmacotherapy, Faculty of Pharmacy, Medical University “Prof. Dr. Paraskev Stoyanov”, 84 “Tsar Osvoboditel” Blvd, 9000 Varna, Bulgaria
| | - Iliya Zhelev
- grid.20501.360000 0000 8767 9052Department of Biology, Faculty of Pharmacy, Medical University “Prof. Dr. Paraskev Stoyanov”, 84 “Tsar Osvoboditel” Blvd, 9000 Varna, Bulgaria
| | - Kaloyan D. Georgiev
- grid.20501.360000 0000 8767 9052Department of Pharmacology, toxicology and pharmacotherapy, Faculty of Pharmacy, Medical University “Prof. Dr. Paraskev Stoyanov”, 84 “Tsar Osvoboditel” Blvd, 9000 Varna, Bulgaria
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Hu YH, Quan ZY, Li DK, Wang CY, Sun ZX. Inhibition of CYP3A4 enhances aloe-emodin induced hepatocyte injury. Toxicol In Vitro 2021; 79:105276. [PMID: 34875353 DOI: 10.1016/j.tiv.2021.105276] [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: 09/08/2021] [Revised: 11/19/2021] [Accepted: 11/22/2021] [Indexed: 11/18/2022]
Abstract
Aloe-emodin (AE) is a natural hydroxyanthraquinone derivative that was found in many medicinal plants and ethnic medicines. AE showed a wide array of pharmacological activities including anticancer, antifungal, laxative, antiviral, and antibacterial effects. However, increasing number of published studies have shown that AE may have some hepatotoxicity effects but the mechanism is not fully understood. Studies have shown that the liver injury induced by some free hydroxyanthraquinone compounds is associated with the inhibition of some metabolic enzymes. In this study, the CYP3A4 and CYP3A1 were found to be the main metabolic enzymes of AE in human and rat liver microsomes respectively. And AE was metabolized by liver microsomes to produce hydroxyl metabolites and rhein. When CYP3A4 was knocked down in L02 and HepaRG cells, the cytotoxicity of AE was increased significantly. Furthermore, AE increased the rates of apoptosis of L02 and HepaRG cells, accompanied by Ca2+ elevation, mitochondrial membrane potential (MMP) loss and reactive oxygen species (ROS) overproduction. The mRNA expression of heme oxygenase-1 in L02 and HepaRG cells increased significantly in the high-dose of AE (40 μmol/L) group, and the mRNA expression of quinone oxidoreductase-1 was activated by AE in all concentrations. Taken together, the inhibition of CYP3A4 enhances the hepatocyte injury of AE. AE can induce mitochondrial injury and the imbalance of oxidative stress of hepatocytes, which results in hepatocyte apoptosis.
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Affiliation(s)
- Ying-Huan Hu
- School of Life Sciences, Beijing University of Chinese Medicine, Beijing 100029, China
| | - Zheng-Yang Quan
- School of Life Sciences, Beijing University of Chinese Medicine, Beijing 100029, China
| | - Deng-Ke Li
- School of Life Sciences, Beijing University of Chinese Medicine, Beijing 100029, China
| | - Cheng-Yu Wang
- School of Life Sciences, Beijing University of Chinese Medicine, Beijing 100029, China
| | - Zhen-Xiao Sun
- School of Life Sciences, Beijing University of Chinese Medicine, Beijing 100029, China.
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Zhou B, Ma C, Zheng C, Xia T, Ma B, Liu X. 3-Methylxanthine production through biodegradation of theobromine by Aspergillus sydowii PT-2. BMC Microbiol 2020; 20:269. [PMID: 32854634 PMCID: PMC7453516 DOI: 10.1186/s12866-020-01951-z] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/25/2020] [Accepted: 08/18/2020] [Indexed: 12/27/2022] Open
Abstract
Background Methylxanthines, including caffeine, theobromine and theophylline, are natural and synthetic compounds in tea, which could be metabolized by certain kinds of bacteria and fungi. Previous studies confirmed that several microbial isolates from Pu-erh tea could degrade and convert caffeine and theophylline. We speculated that these candidate isolates also could degrade and convert theobromine through N-demethylation and oxidation. In this study, seven tea-derived fungal strains were inoculated into various theobromine agar medias and theobromine liquid mediums to assess their capacity in theobromine utilization. Related metabolites with theobromine degradation were detected by using HPLC in the liquid culture to investigate their potential application in the production of 3-methylxanthine. Results Based on theobromine utilization capacity, Aspergillus niger PT-1, Aspergillus sydowii PT-2, Aspergillus ustus PT-6 and Aspergillus tamarii PT-7 have demonstrated the potential for theobromine biodegradation. Particularly, A. sydowii PT-2 and A. tamarii PT-7 could degrade theobromine significantly (p < 0.05) in all given liquid mediums. 3,7-Dimethyluric acid, 3-methylxanthine, 7-methylxanthine, 3-methyluric acid, xanthine, and uric acid were detected in A. sydowii PT-2 and A. tamarii PT-7 culture, respectively, which confirmed the existence of N-demethylation and oxidation in theobromine catabolism. 3-Methylxanthine was common and main demethylated metabolite of theobromine in the liquid culture. 3-Methylxanthine in A. sydowii PT-2 culture showed a linear relation with initial theobromine concentrations that 177.12 ± 14.06 mg/L 3-methylxanthine was accumulated in TLM-S with 300 mg/L theobromine. Additionally, pH at 5 and metal ion of Fe2+ promoted 3-methylxanthine production significantly (p < 0.05). Conclusions This study is the first to confirm that A. sydowii PT-2 and A. tamarii PT-7 degrade theobromine through N-demethylation and oxidation, respectively. A. sydowii PT-2 showed the potential application in 3-methylxanthine production with theobromine as feedstock through the N-demethylation at N-7 position.
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Affiliation(s)
- Binxing Zhou
- College of Longrun Pu-erh Tea, Yunnan Agricultural University, Kunming, 650201, Yunnan, China.
| | - Cunqiang Ma
- College of Longrun Pu-erh Tea, Yunnan Agricultural University, Kunming, 650201, Yunnan, China. .,Henan Key Laboratory of Tea Comprehensive Utilization in South Henan, Xinyang Agriculture and Forestry University, Xinyang, 464000, Henan, China. .,Kunming Dapu Tea Industry Co., Ltd, Kunming, 650224, Yunnan, China.
| | - Chengqin Zheng
- College of Longrun Pu-erh Tea, Yunnan Agricultural University, Kunming, 650201, Yunnan, China
| | - Tao Xia
- State Key Laboratory of Tea Plant Biology and Utilization, Anhui Agricultural University, Hefei, 230036, Anhui, China
| | - Bingsong Ma
- College of Longrun Pu-erh Tea, Yunnan Agricultural University, Kunming, 650201, Yunnan, China
| | - Xiaohui Liu
- College of Longrun Pu-erh Tea, Yunnan Agricultural University, Kunming, 650201, Yunnan, China
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Protective Effect of Methylxanthine Fractions Isolated from Bancha Tea Leaves against Doxorubicin-Induced Cardio- and Nephrotoxicities in Rats. BIOMED RESEARCH INTERNATIONAL 2020; 2020:4018412. [PMID: 32851069 PMCID: PMC7439203 DOI: 10.1155/2020/4018412] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 02/20/2020] [Revised: 06/18/2020] [Accepted: 07/21/2020] [Indexed: 11/18/2022]
Abstract
Doxorubicin is an anthracycline antibiotic that is used for the treatment of various types of cancer. However, its clinical usage is limited due to its potential life-threatening adverse effects, such as cardio- and nephrotoxicities. Nonetheless, simultaneous administration of doxorubicin and antioxidants, such as those found in green tea leaves, could reduce cardiac and renal tissue damage caused by oxidative stress. The methylxanthine fraction isolated from Bancha tea leaves were tested in vitro for its antioxidant activity and in vivo for its organoprotective properties against doxorubicin-induced cardio- and nephrotoxicities in a rat model. The in vivo study was conducted on male Wistar rats divided into 6 groups. Methylxanthines were administered at high (5 mg/kg body weight) and low (1 mg/kg body weight) doses, while doxorubicin was administered at a cumulative dose of 20 mg/kg body weight. Serum creatinine, uric acid, and urea concentrations, as well as serum enzyme levels (creatinine kinase (CK), creatinine kinase MB fraction (CK-MB), aspartate aminotransferase (AST), and lactate dehydrogenase (LDH)) and electrolytes (Na+, K+, and Cl−), were analysed. In addition, histological analysis was performed to assess cardiac and renal tissue damage. The concomitant administration of Bancha methylxanthines and doxorubicin showed a dose-dependent reduction in the serum biochemical parameters, indicating a decrease in the cardiac and renal tissue damage caused by the antibiotic. Histological analysis showed that pretreatment with methylxanthines at the dose of 5 mg/kg resulted in an almost normal myocardial structure and a significant decrease in the morphological kidney changes caused by doxorubicin exposure compared with the group that received doxorubicin alone. The putative mechanism is most likely related to a reduction in the oxidative stress caused by doxorubicin.
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Chen Y, Pan G, Xu W, Sun Q, Wang B, Zhang Y, Yang T. Spectrum-effect relationship study between HPLC fingerprints and antioxidant activity of Sabia parviflora. J Chromatogr B Analyt Technol Biomed Life Sci 2020; 1140:121970. [DOI: 10.1016/j.jchromb.2020.121970] [Citation(s) in RCA: 14] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/06/2019] [Revised: 12/16/2019] [Accepted: 01/07/2020] [Indexed: 01/14/2023]
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