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Shumyantseva VV, Bulko TV, Koroleva PI, Shikh EV, Makhova AA, Kisel MS, Haidukevich IV, Gilep AA. Human Cytochrome P450 2C9 and Its Polymorphic Modifications: Electroanalysis, Catalytic Properties, and Approaches to the Regulation of Enzymatic Activity. Processes (Basel) 2022; 10:383. [DOI: 10.3390/pr10020383] [Citation(s) in RCA: 6] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/27/2023] Open
Abstract
The electrochemical properties of cytochrome P450 2C9 (CYP2C9) and polymorphic modifications P450 2C9*2 (CYP2C9*2) and P450 2C9*3 (CYP2C9*3) were studied. To analyze the comparative electrochemical and electrocatalytic activity, the enzymes were immobilized on electrodes modified with a membrane-like synthetic surfactant (didodecyldimethylammonium bromide (DDAB)). An adequate choice of the type of modified electrode was confirmed by cyclic voltammetry of cytochromes P450 under anaerobic conditions, demonstrating well-defined peaks of reduction and oxidation of the heme iron. The midpoint potential, Emid, of cytochrome P450 2C9 is −0.318 ± 0.01 V, and Emid = −0.324 ± 0.01 V, and Emid = −0.318 ± 0.03 V for allelic variant 2C9*2 and allelic variant 2C9*3, respectively. In the presence of substrate diclofenac under aerobic conditions, cytochrome P450 2C9 and its polymorphic modifications P450 2C9*2 and P450 2C9*3 exhibit catalytic properties. Stimulation of the metabolism of diclofenac by cytochrome P450 2C9 in the presence of antioxidant medications mexidol and taurine was shown.
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Abstract
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Organocatalysis has become a powerful tool in organic synthesis for the formation of C-C and C-X (N, S, O, etc.) bonds, leading to the formation of complex molecules from easily available starting materials. It provides an alternative platform to the conventional synthesis and fulfills the principles of green chemistry. During the last decades, taurine has emerged as a promising organocatalyst in an array of organic transformations in addition to its plentiful biological properties. It is highly stable, easy to store and separate, water-soluble, of low cost, easily available, and recyclable. The present article highlights the recent and up-to-date applications of taurine in organic transformations.
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Affiliation(s)
- Shikha Agarwal
- Synthetic Organic Chemistry Laboratory, Department of Chemistry, MLSU, Udaipur, 313001, India
| | - Priyanka Kalal
- Synthetic Organic Chemistry Laboratory, Department of Chemistry, MLSU, Udaipur, 313001, India
| | - Ayushi Sethiya
- Synthetic Organic Chemistry Laboratory, Department of Chemistry, MLSU, Udaipur, 313001, India
| | - Jay Soni
- Synthetic Organic Chemistry Laboratory, Department of Chemistry, MLSU, Udaipur, 313001, India
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Makhova AA, Shikh EV, Bulko TV, Gilep AA, Usanov SA, Shumyantseva VV. No effect of lipoic acid on catalytic activity of cytochrome P450 3A4. Drug Metab Pers Ther 2020; 35:dmpt-2020-0105. [PMID: 32712589 DOI: 10.1515/dmpt-2020-0105] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/13/2020] [Accepted: 05/13/2020] [Indexed: 01/10/2023]
Abstract
Objectives α-Lipoic acid is used as an antioxidant in multivitamin formulations to restore the normal level of intracellular glutathione after depletion caused by environmental pollutants or during physiological aging of the body, as a chelating agent, as a dietary supplement, in anti-aging compositions. Lipoic acid (LA) acts as a buffer in cancer therapy and in therapy of diseases associated with oxidative stress. The effect of LA on the catalytic functions of cytochrome P450 3A4 as the main enzyme of the biotransformation of drugs was studied. It was shown that LA in the concentration range of 50-200 μM affects the stage of electron transfer (stage of cytochrome P450 3A4 heme reduction), decreasing the cathodic reduction current by an average of 20 ± 5%. The kinetic parameters (k cat) of the N-demethylation reaction of erythromycin, the antibiotic of the macrolide group, used as a marker substrate for the comparative analysis of the catalytic activity of cytochrome P450 3A4, both in the presence of α-lipoic acid and in the cytochrome P450 3A4-erythromycin complex, amounted to comparable values of 3.5 ± 0.9 and 3.4 ± 0.9 min-1, respectively. Based on these experimental data, we can conclude that there is no significant effect of α-lipoic acid on the catalysis of cytochrome P450 3A4. These results can be projected on the possibility of using α-lipoic acid in complex therapy without negative impact on the enzymatic cytochrome P450 system. Methods The analysis was performed in electrochemical non-invasive model systems for recording the catalytic activity of cytochrome P450 3A4, using screen-printed electrodes, modified with membranous didodecyldimethylammonium bromide. Results It was shown that LA did not affect the N-demethylation of macrolide antibiotic erythromycin. Catalytic constant (k cat) of N-demethylation of erythromycin corresponds to 3.4 ± 0.9 min-1 and in the presence of LA corresponds to 3.5 ± 0.9 min-1. Conclusions Based on the obtained experimental data, we can conclude that there is no significant effect of α-lipoic acid on individual stages and processes of catalysis of cytochrome P450 3A4. LA can be recommended for inclusion in complex therapy as an antioxidant, antitoxic and chelating compound without negative impact on the enzymatic cytochrome P450 3A4 activity of the human body.
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Affiliation(s)
- Anna A Makhova
- Sechenov First Moscow State Medical University, Moscow, Russian Federation
| | - Evgeniya V Shikh
- Sechenov First Moscow State Medical University, Moscow, Russian Federation
| | - Tatiana V Bulko
- Institute of Biomedical Chemistry, Moscow, Russian Federation
| | | | | | - Victoria V Shumyantseva
- Institute of Biomedical Chemistry, Moscow, Russian Federation.,Pirogov Russian National Research Medical University, Moscow, Russian Federation
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Liu NR, Yang K, Li WT, Pang ZH, Zhang Q, Wang JJ, Dang WX, Jia RY, Fu ZW, Li YX, Yao ZH, Fang ZZ. Evaluation of the inhibition of chlorophenols towards human cytochrome P450 3A4 and differences among various species. Sci Total Environ 2020; 724:138187. [PMID: 32408447 DOI: 10.1016/j.scitotenv.2020.138187] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/04/2019] [Revised: 02/14/2020] [Accepted: 03/23/2020] [Indexed: 06/11/2023]
Abstract
Chlorophenols (CPs) are important pollutants detected frequently in the environment. This study intended to detect the inhibitory effects of fourteen CPs (2-CP, 3-CP, 4-CP, 4C2AP, 4C3MP, 2.4-DCP, 2.3.4-TCP, 2.4.5-TCP, 2.4.6-TCP, 3.4.5-TCP, 2.3.4.5-TECP, 2.3.4.6-TECP, 2.3.5.6-TECP and PCP) towards human liver cytochrome P450 3A4 (CYP3A4). Throughout the tests, testosterone was used as the probe substrate and CPs were used as inhibitors. A series of experiments (enzyme activity assays, preliminary screening tests, inhibition kinetics determination) were conducted to determine the inhibition of CPs towards human liver CYP3A4. CPs with the inhibitory effect >80% were selected for the inhibition evaluation in liver microsomes from different animal species (monkey, rat, dog, pig). The results showed that 2.3.4-TCP, 3.4.5-TCP, and 2.3.4.5-TECP inhibited the activities of CYP3A4 by 80.3%, 93.4%, 91.6%, respectively. Inhibition kinetics type were non-competitive and inhibition kinetics constant (Ki) values were 26.4 μM, 13.5 μM, and 8.8 μM for the inhibition of 2.3.4-TCP, 3.4.5-TCP, and 2.3.4.5-TECP towards human CYP3A4, respectively. Inhibition kinetics type was competitive and Ki value was 4.9 μM for the inhibition of 2.3.4-TCP towards CYP3A4 in Monkey liver microsomes (MyLMs). Inhibition kinetic types were non-competitive and Ki values were 8.1 μM and 28.7 μM for the inhibition of 3.4.5-TCP and 2.3.4.5-TECP towards CYP3A4 in MyLMs. Inhibition kinetic types were non-competitive and Ki values were 13.8 μM, 0.6 μM, and 6.1 μM for the inhibition of 2.3.4-TCP, 3.4.5-TCP, and 2.3.4.5-TECP towards CYP3A4 in Dog liver microsomes (DLMs), respectively. By comparing Ki values and inhibition kinetic types, the dog was the most suitable model to assess the inhibition of 2.3.4-TCP and 2.3.4.5-TECP towards CYP3A4, and monkey was the most suitable model to assess the inhibition of 3.4.5-TCP towards CYP3A4. In conclusion, our recent study on the inhibition of CPs towards CYP3A4 and species differences was important for further toxicological studies of CPs in human bodies.
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Affiliation(s)
- Nai-Rong Liu
- Tianjin Medical University, 22 Qixiangtai Road, Heping District, Tianjin, China; Department of Cardiology, Tianjin Union Medical Center, Tianjin 300121, China
| | - Kai Yang
- Tianjin Medical University, 22 Qixiangtai Road, Heping District, Tianjin, China; Department of Toxicology and Sanitary Chemistry, School of Public Health, Tianjin Medical University, 22 Qixiangtai Road, Heping District, Tianjin, China; Tianjin Key Laboratory of Environment, Nutrition and Public Health, Tianjin, China
| | - Wen-Ting Li
- Department of Cardiology, Tianjin Union Medical Center, Tianjin 300121, China
| | - Zhi-Hua Pang
- Department of Cardiology, Tianjin Union Medical Center, Tianjin 300121, China
| | - Qing Zhang
- Tianjin Medical University, 22 Qixiangtai Road, Heping District, Tianjin, China; Department of Cardiology, Tianjin Union Medical Center, Tianjin 300121, China
| | - Jia-Jia Wang
- Tianjin Medical University, 22 Qixiangtai Road, Heping District, Tianjin, China; Department of Cardiology, Tianjin Union Medical Center, Tianjin 300121, China
| | - Wen-Xi Dang
- Tianjin Medical University, 22 Qixiangtai Road, Heping District, Tianjin, China; Department of Cardiology, Tianjin Union Medical Center, Tianjin 300121, China
| | - Ruo-Yong Jia
- Tianjin Medical University, 22 Qixiangtai Road, Heping District, Tianjin, China; Department of Toxicology and Sanitary Chemistry, School of Public Health, Tianjin Medical University, 22 Qixiangtai Road, Heping District, Tianjin, China; Tianjin Key Laboratory of Environment, Nutrition and Public Health, Tianjin, China
| | - Zhi-Wei Fu
- Department of Toxicology and Sanitary Chemistry, School of Public Health, Tianjin Medical University, 22 Qixiangtai Road, Heping District, Tianjin, China; Tianjin Key Laboratory of Environment, Nutrition and Public Health, Tianjin, China
| | - Yi-Xuan Li
- Tianjin University of Traditional Chinese Medicine, Tianjin, China
| | - Zhu-Hua Yao
- Department of Cardiology, Tianjin Union Medical Center, Tianjin 300121, China.
| | - Zhong-Ze Fang
- Tianjin Medical University, 22 Qixiangtai Road, Heping District, Tianjin, China; Department of Toxicology and Sanitary Chemistry, School of Public Health, Tianjin Medical University, 22 Qixiangtai Road, Heping District, Tianjin, China; Tianjin Key Laboratory of Environment, Nutrition and Public Health, Tianjin, China.
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Moldogazieva NT, Mokhosoev IM, Mel'nikova TI, Zavadskiy SP, Kuz'menko AN, Terentiev AA. Dual Character of Reactive Oxygen, Nitrogen, and Halogen Species: Endogenous Sources, Interconversions and Neutralization. Biochemistry (Mosc) 2020; 85:S56-S78. [PMID: 32087054 DOI: 10.1134/s0006297920140047] [Citation(s) in RCA: 12] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Abstract
Oxidative stress resulting from accumulation of reactive oxygen, nitrogen, and halogen species (ROS, RNS, and RHS, respectively) causes the damage of cells and biomolecules. However, over the long evolutionary time, living organisms have developed the mechanisms for adaptation to oxidative stress conditions including the activity of the antioxidant system (AOS), which maintains low intracellular levels of RONS (ROS and RNS) and RHS. Moreover, living organisms have adapted to use low concentrations of these electrophiles for the regulation of cell functions through the reversible post-translational chemical modifications of redox-sensitive amino acid residues in intracellular effectors of signal transduction pathways (protein kinases and protein phosphatases), transcription factors, etc. An important fine-tuning mechanism that ensures involvement of RONS and RHS in the regulation of physiological processes is interconversion between different reactive species. This review focuses on the complex networks of interacting RONS and RHS types and their endogenous sources, such as NOX family of NADPH oxidases, complexes I and III of the mitochondrial electron transport chain, NO synthases, cytochrome P450-containing monooxygenase system, xanthine oxidoreductase, and myeloperoxidases. We highlight that kinetic parameters of reactions involving RONS and RHS determine the effects of these reactive species on cell functions. We also describe the functioning of enzymatic and non-enzymatic AOS components and the mechanisms of RONS and RHS scavenging under physiological conditions. We believe that analysis of interactions between RONS and relationships between different endogenous sources of these compounds will contribute to better understanding of their role in the maintenance of cell redox homeostasis as well as initiation and progression of diseases.
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Affiliation(s)
- N T Moldogazieva
- Sechenov First Moscow State Medical University, Moscow, 119991, Russia.
| | - I M Mokhosoev
- Pirogov Russian National Research Medical University, Moscow, 117997, Russia.
| | - T I Mel'nikova
- Sechenov First Moscow State Medical University, Moscow, 119991, Russia
| | - S P Zavadskiy
- Sechenov First Moscow State Medical University, Moscow, 119991, Russia
| | - A N Kuz'menko
- Sechenov First Moscow State Medical University, Moscow, 119991, Russia
| | - A A Terentiev
- Pirogov Russian National Research Medical University, Moscow, 117997, Russia
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Makhova AA, Shikh EV, Bulko TV, Sizova ZM, Shumyantseva VV. The influence of taurine and L-carnitine on 6 β-hydroxycortisol/cortisol ratio in human urine of healthy volunteers. Drug Metab Pers Ther 2019; 34:dmpt-2019-0013. [PMID: 31603853 DOI: 10.1515/dmpt-2019-0013] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/24/2019] [Accepted: 08/16/2019] [Indexed: 12/21/2022]
Abstract
Background Cytochrome P450s (CYPs, EC 1.14.14.1) are the main enzymes of drug metabolism. The functional significance of CYPs also includes the metabolism of foreign chemicals and endogenic biologically active compounds. The CYP3A4 isoform contributes to the metabolism of about half of all marketed medicinal preparations. The aim of this study was to investigate the effects of two biologically active compounds: 2-aminoethane-sulfonic acid (taurine) and 3-hydroxy-4-trimethylaminobutyrate (L-carnitine) on urinary 6β-hydroxycortisol/cortisol (6β-OHC/cortisol) metabolic ratio as a biomarker of the CYP3A4 activity of healthy volunteers. Taurine is used for the treatment of chronic heart failure and liver disease. Cardiologists, nephrologists, neurologists, gerontologists in addition to the main etiopathogenetic therapies, use L-carnitine. The quantification of the 6β-OHC/cortisol metabolic ratio as a biomarker of CYP3A4 activity in human urine was used for the assessment of CYP3A4 catalytic activity as a non-invasive test. Methods The study included 18 healthy male volunteers (aged from 18 to 35 years old). The volunteers took taurine in a dose of 500 mg twice a day or L-carnitine in a dose of 2.5 mL 3 times a day for 14 consecutive days. The test drug was given 20 min before meals. The collection of urine samples was performed before and after 3, 7, 10, and 14 days after taurine intake. The metabolic ratio of 6β-OHC/cortisol in morning spot urine samples was studied by the liquid chromatography/mass spectroscopy (LC/MS) method. Results The ratio of 6-6β-OHC/cortisol was used as a biomarker to study the taurine and L-carnitine influence on CYP3A4 metabolism of cortisol. The ratio of urinary 6β-OCH/cortisol in the morning urine samples of volunteers before the beginning of taurine therapy (baseline ratio) was 2.71 ± 0.2. Seven days after the administration of taurine in a dose of 500 mg twice a day, the 6β-OCH/cortisol ratio was 3.3 ± 0.2, which indicated the increased catalytic activity of CYP3A4 towards cortisol. As for the L-carnitine supplementation, analysis of the 6β-OCH/cortisol ratio in the urine for 14 days did not show any significant changes in this baseline ratio, indicating the lack of L-carnitine influence on the catalytic activity of CYP3A4 to cortisol. Conclusions The results obtained demonstrated the influence of taurine on 6β-OCH/cortisol metabolic ratio as a biomarker of CYP3A4 catalytic activity to cortisol. L-carnitine did not affect the activity of CYP3A4. The lack of a clinically meaningful effect of L-carnitine was established.
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Affiliation(s)
- Anna A Makhova
- I.M. Sechenov First Moscow State Medical University, Moscow, Russia
| | - Eugenia V Shikh
- I.M. Sechenov First Moscow State Medical University, Moscow, Russia
| | | | - Zhanna M Sizova
- I.M. Sechenov First Moscow State Medical University, Moscow, Russia
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