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Dighole RP, Munde AV, Mulik BB, Zade SS, Sathe BR. Melamine functionalised multiwalled carbon nanotubes (M-MWCNTs) as a metal-free electrocatalyst for simultaneous determination of 4-nitrophenol and nitrofurantoin. NEW J CHEM 2022. [DOI: 10.1039/d2nj03901j] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
An innovative melamine functionalised multiwalled carbon nanotube (M-MWCNTs) based electrochemical sensor has been developed for the determination of environmental nitro-aromatic pollutants, such as 4-nitrophenol (4-NP) and nitrofurantoin (NFT).
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Affiliation(s)
- Raviraj P. Dighole
- Department of Chemistry, Dr Babasaheb Ambedkar Marathwada University, Aurangabad 431004, MS, India
- Arts, Science & Commerce College, Badnapur 431202, India
| | - Ajay V. Munde
- Department of Chemistry, Dr Babasaheb Ambedkar Marathwada University, Aurangabad 431004, MS, India
- Department of Chemical Sciences and Centre for Advanced Functional Materials, Indian Institute of Science Education and Research (IISER) Kolkata, Mohanpur, Nadia 741246, West Bengal, India
| | - Balaji B. Mulik
- Department of Chemistry, Dr Babasaheb Ambedkar Marathwada University, Aurangabad 431004, MS, India
| | - Sanjio S. Zade
- Department of Chemical Sciences and Centre for Advanced Functional Materials, Indian Institute of Science Education and Research (IISER) Kolkata, Mohanpur, Nadia 741246, West Bengal, India
| | - Bhaskar R. Sathe
- Department of Chemistry, Dr Babasaheb Ambedkar Marathwada University, Aurangabad 431004, MS, India
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Wahab R, Khan F, Ahmad N, Alam M, Ahmad J, Al-Khedhairy AA. Rapid sensing response for phenol with CuO nanoparticles. Colloids Surf A Physicochem Eng Asp 2020. [DOI: 10.1016/j.colsurfa.2020.125424] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
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Miletić AS, Pecev-Marinković ET, Grahovac ZM, Pavlović AN, Tošić SB, Mišić IDR. Kinetic Spectrophotometric Method for 4-nitrophenol Determination in Drinking Water. JOURNAL OF ANALYTICAL CHEMISTRY 2019. [DOI: 10.1134/s1061934819060066] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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Jiang J, Yu Y, Wang L, Li J, Ling J, Li Y, Duan G. Enzyme immobilized on polyamidoamine-coated magnetic microspheres for α-glucosidase inhibitors screening from Radix Paeoniae Rubra extracts accompanied with molecular modeling. Talanta 2018; 195:127-136. [PMID: 30625522 DOI: 10.1016/j.talanta.2018.11.009] [Citation(s) in RCA: 22] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/27/2018] [Revised: 10/29/2018] [Accepted: 11/04/2018] [Indexed: 11/25/2022]
Abstract
In this study, a method for direct screening and identification of α-glucosidase inhibitors (AGIs) from extracts of natural products was established based on polyamidoamine (PAMAM) coated magnetic microspheres. A facile route to synthesize the magnetic PAMAM was employed and α-glucosidase was successfully covalently attached to its surface through cross linking of glutaraldehyde. Using the enzyme-loaded magnetic microspheres, potential inhibitors were fished out from crude extracts directly, followed by structure confirmation. The inhibitory activities of the screened components were further investigated by the enzyme-loaded magnetic microspheres. The Fe3O4 @PAMAM@α-Glu microspheres displayed favorable dispersibility, fast magnetic separation, large enzyme binding amount (42.9 μg•mg-1) and high enzyme activity. Moreover, the α-glucosidase on the surface of PAMAM coating maintained high storage stability and remarkable reusability. Taking advantage of specific interaction of the α-glucosidase with AGIs, the materials could selectively capture a known AGI (+)-catechin under the interference of an inactive compound salicylic acid, with a binding capacity as high as 15.4%. Additionally, using the Fe3O4 @PAMAM@α-Glu microspheres in the inhibition assay, the enzymatic reaction could be stopped by magnetic separation instead of the traditional addition of Na2CO3 solution, which not only eliminated the disturbance of termination reagent to the results, but also reused the immobilized α-glucosidase. The screening and inhibitory activity verification of potential ligands in Radix Paeoniae Rubra ("Chi-shao" in Chinese) extracts were achieved by using Fe3O4 @PAMAM@α-Glu microspheres, demonstrating practical applicability of our method. Therefore, the magnetic PAMAM-based screening approach could be a feasible and alternative strategy for discovering enzyme inhibitors from natural product extracts.
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Affiliation(s)
- Jiebing Jiang
- Fudan University Affiliated Pudong Medical Center & Pharmaceutical Analysis Department, School of Pharmacy, Fudan University, Shanghai 201203, China
| | - Yingjia Yu
- Fudan University Affiliated Pudong Medical Center & Pharmaceutical Analysis Department, School of Pharmacy, Fudan University, Shanghai 201203, China
| | - Liping Wang
- Jing'an District Central Hospital, Fudan University, 259 Xikang Road, Shanghai 200040, China
| | - Jiajia Li
- Fudan University Affiliated Pudong Medical Center & Pharmaceutical Analysis Department, School of Pharmacy, Fudan University, Shanghai 201203, China
| | - Jin Ling
- Department of Biochemical Drugs and Biological Products, Shanghai Institute for Food and Drug Control, No.1500 Zhangheng Road, Pudong New District, Shanghai 201203, China
| | - Yan Li
- Fudan University Affiliated Pudong Medical Center & Pharmaceutical Analysis Department, School of Pharmacy, Fudan University, Shanghai 201203, China.
| | - Gengli Duan
- Fudan University Affiliated Pudong Medical Center & Pharmaceutical Analysis Department, School of Pharmacy, Fudan University, Shanghai 201203, China.
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Arzuk E, Turna B, Sözbilen M, Orhan H. Inter-individual and inter-organ variability in the bioactivation of paracetamol by human liver and kidney tissues. ENVIRONMENTAL TOXICOLOGY AND PHARMACOLOGY 2018; 61:8-17. [PMID: 29803978 DOI: 10.1016/j.etap.2018.05.015] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/08/2018] [Revised: 05/19/2018] [Accepted: 05/22/2018] [Indexed: 06/08/2023]
Abstract
Paracetamol (PAR) overdose is associated with massive hepatic injury; it may induce kidney toxicity as well. It is essential to measure organ-specific activities of related CYPs for evaluating the overdose cases. Available HPLC-based methods require high amounts of tissue samples. In order to develop liquid chromatography mass spectrometry (LC-MS)-based methods to process small amounts of human tissues, liver and kidney samples were obtained. Individual microsomes were prepared and incubated with PAR (for quantifying bioactivation), with nifedipine (for measuring CYP3A4 activity) and with p-nitrophenol (for measuring CYP2E1 activity). The small amount of tissue microsomes was sufficient to measure both the formation of NAPQI and the activities of CYP enzymes. Although the sample size in group was relatively low, both NAPQI formation and activity of CYP2E1 were significantly higher in males compared to females in kidney. Considerable variations in the metabolic capacity of individuals were observed for both organs.
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Affiliation(s)
- Ege Arzuk
- Department of Toxicology, Faculty of Pharmacy, Ege University, 35100, Bornova, İzmir, Turkey
| | - Burak Turna
- Department of Urology, Faculty of Medicine, Ege University, 35100, Bornova, İzmir, Turkey
| | - Murat Sözbilen
- Department of General Surgery, Faculty of Medicine, Ege University, 35100, Bornova, İzmir, Turkey
| | - Hilmi Orhan
- Department of Toxicology, Faculty of Pharmacy, Ege University, 35100, Bornova, İzmir, Turkey.
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Hydrothermal Synthesis of Cr 2Se 3 Hexagons for Sensitive and Low-level Detection of 4-Nitrophenol in Water. Sci Rep 2018; 8:4839. [PMID: 29555957 PMCID: PMC5859153 DOI: 10.1038/s41598-018-23243-3] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/08/2017] [Accepted: 03/08/2018] [Indexed: 01/19/2023] Open
Abstract
We report a simple hydrothermal method used for the synthesis of Cr2Se3 hexagons (h-Cr2Se3) and its application towards electrochemical sensing of 4-nitrophenol (4-NP). The formation of h-Cr2Se3 was confirmed by using scanning electron microscopy, energy dispersive X-ray spectroscopy, X-ray diffraction, and X-ray photoelectron spectroscopy. The electrochemical activity of the h-Cr2Se3 modified screen-printed carbon electrode (SPCE) towards 4-NP was studied using cyclic voltammetry (CV) and amperometric i-t techniques. Typically, the obtained results were compared with those for a bare SPCE. The CV result clearly reveals that h-Cr2Se3 modified SPCE has higher catalytic activity towards reduction of 4-NP than bare SPCE. Hence, h-Cr2Se3 modified SPCE was concluded as a viable sensor for sensitive determination of 4-NP. Under optimized conditions, h-Cr2Se3 modified SPCE demonstrates the excellent capacity to detect the 4-NP in a linear range from 0.05 µM to 908.0 µM. The LOD and sensitivity in detection of 4-NP were determined at 0.01 µM and 1.24 µAµM−1 cm−2 respectively. The sensor is highly selective and stable and shows reproducible recovery of 4-NP in domestic supply and river water samples.
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Yadav DK, Ganesan V, Marken F, Gupta R, Sonkar PK. Metal@MOF Materials in Electroanalysis: Silver-Enhanced Oxidation Reactivity Towards Nitrophenols Adsorbed into a Zinc Metal Organic Framework—Ag@MOF-5(Zn). Electrochim Acta 2016. [DOI: 10.1016/j.electacta.2016.10.009] [Citation(s) in RCA: 32] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/22/2023]
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Benmansour P, Billinsky J, Duke-Novakovski T, Alcorn J. Blood concentrations of remifentanil during and after infusion in horses anesthetized with isoflurane and dexmedetomidine. Res Vet Sci 2016; 107:202-206. [DOI: 10.1016/j.rvsc.2016.06.008] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/23/2016] [Revised: 06/06/2016] [Accepted: 06/12/2016] [Indexed: 11/16/2022]
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van de Wier B, Balk JM, Bast A, Koek GH, Haenen GRMM. Chemical characteristics for optimizing CYP2E1 inhibition. Chem Biol Interact 2015; 242:139-44. [PMID: 26428356 DOI: 10.1016/j.cbi.2015.09.024] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/03/2015] [Revised: 09/17/2015] [Accepted: 09/24/2015] [Indexed: 10/23/2022]
Abstract
Cytochrome P450 2E1 (CYP2E1) expression and activity in the liver is associated with the degree of liver damage in patients with alcoholic steatohepatitis (ASH) as well as non-alcoholic steatohepatitis (NASH). CYP2E1 is known to generate reactive oxygen species, which leads to oxidative stress, one of the hallmarks of both diseases. Apart from ROS, toxic metabolites can be formed by CYP2E1 metabolism, further potentiating liver injury. Therefore, CYP2E1 is implicated in the pathogenesis of ASH and NASH. The aim of this study was to determine the chemical characteristics of compounds that are important to inhibit CYP2E1. To this end, structurally related analogs that differed in their lipophilic, steric and electronic properties were tested. In addition, homologues series of aliphatic primary alcohols, secondary alcohols, aldehydes, ketones and carboxylic acids were tested. It was found that inhibition of the CYP2E1 activity is primarily governed by lipophilicity. The optimal log D7.4 (octanol/water distribution coefficient at pH 7.4) value for inhibition of CYP2E1 was approximately 2.4. In the carboxylic acids series the interaction of the carboxylate group with polar residues lining the CYP2E1 active site also has to be considered. This study sketches the basic prerequisites in the search for inhibitors of CYP2E1, which would strengthen our therapeutic armamentarium against CYP2E1 associated diseases, such as ASH and NASH.
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Affiliation(s)
- B van de Wier
- Department of Toxicology, P.O. Box 616, 6200 MD, Maastricht, Maastricht University, The Netherlands.
| | - J M Balk
- Department of Toxicology, P.O. Box 616, 6200 MD, Maastricht, Maastricht University, The Netherlands
| | - A Bast
- Department of Toxicology, P.O. Box 616, 6200 MD, Maastricht, Maastricht University, The Netherlands
| | - G H Koek
- Department of Internal Medicine, Division of Gastroenterology and Hepatology, Maastricht University Medical Centre, P.O. Box 5800, 6202 AZ, Maastricht, The Netherlands
| | - G R M M Haenen
- Department of Toxicology, P.O. Box 616, 6200 MD, Maastricht, Maastricht University, The Netherlands
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Martín-Sabroso C, Tavares-Fernandes DF, Espada-García JI, Torres-Suárez AI. Validation protocol of analytical procedures for quantification of drugs in polymeric systems for parenteral administration: Dexamethasone phosphate disodium microparticles. Int J Pharm 2013; 458:188-96. [DOI: 10.1016/j.ijpharm.2013.09.026] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/04/2013] [Revised: 09/20/2013] [Accepted: 09/22/2013] [Indexed: 10/26/2022]
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Sirisangtragul W, Sripanidkulchai B. Moduratory effect of Thai traditional medicine (Yahom Tultavai) on hepatic cytochrome P450 enzymes and pentobarbital-induced sleeping in mice. AFRICAN JOURNAL OF TRADITIONAL, COMPLEMENTARY, AND ALTERNATIVE MEDICINES 2013; 10:128-36. [PMID: 24146513 DOI: 10.4314/ajtcam.v10i4.21] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
Abstract
Yahom Tultavai is a Thai traditional medicine that has been widely used for the treatment of nausea, vomiting, dizziness and weakness in aged-people, especially. Its formula contains several medicinal plants, and one of them is Kaempferia galanga L., which has ethyl-p-methoxycinnamate (EPMC) as its major compound. Recently, several herbs and traditional medicines have been reported to demonstrate herbal-drug interaction with conventional medicines. This study aims to investigate the effect of Yahom Tultavai extracts on hepatic cytochrome P450 enzymes and pentobarbital-induced sleeping in mice. Three extracts of Yahom Tultavai, using dichloromethane, methanol and distilled water as solvents were orally administered for 28 days prior to determine CYP1A1, CYP1A2, CYP2B, CYP2E1 and CYP3A4 activities. All three extracts significantly inhibited CYP1A1, CYP1A2 and CYP 2E1 activities, but only dichloromethane extract enhanced CYP2B activity. In addition, all three extracts had no effect on CYP3A4 activity. As an indicator for metabolic drug interaction, pentobarbital-induced sleeping time was decreased in connection with the induction of CYP2B activity between 7 and 28 days of dichloromethane extract and EPMC-treated animals when compared to control. In conclusion, Yahom Tultavai extracts affected hepatic microsomal CYP enzyme activities and reduced pentobarbital-induced sleeping time in mice. The results suggest that Yahom Tultavai may potentially cause herbal and conventional drug interaction, which can affect the clinical implication of drug action. Therefore, the co-administration of Yahom Tultavai with certain drugs should be carefully considered.
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Affiliation(s)
- Wanna Sirisangtragul
- Faculty of Sciences, Khon Kaen University, Faculty of Pharmaceutical Sciences, Khon Kaen 40002, Thailand
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Baati T, Njim L, Neffati F, Kerkeni A, Bouttemi M, Gref R, Najjar MF, Zakhama A, Couvreur P, Serre C, Horcajada P. In depth analysis of the in vivo toxicity of nanoparticles of porous iron(iii) metal–organic frameworks. Chem Sci 2013. [DOI: 10.1039/c3sc22116d] [Citation(s) in RCA: 253] [Impact Index Per Article: 23.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022] Open
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The prolongation of the lifespan of rats by repeated oral administration of [60]fullerene. Biomaterials 2012; 33:4936-46. [DOI: 10.1016/j.biomaterials.2012.03.036] [Citation(s) in RCA: 109] [Impact Index Per Article: 9.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/10/2012] [Accepted: 03/10/2012] [Indexed: 01/18/2023]
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Elbarbry F, Ragheb A, Marfleet T, Shoker A. Modulation of Hepatic Drug Metabolizing Enzymes by Dietary Doses of Thymoquinone in Female New Zealand White Rabbits. Phytother Res 2012; 26:1726-30. [DOI: 10.1002/ptr.4628] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/10/2011] [Revised: 01/17/2012] [Accepted: 01/23/2012] [Indexed: 11/07/2022]
Affiliation(s)
- Fawzy Elbarbry
- School of Pharmacy; Pacific University Oregon; Hillsboro OR 97123 USA
| | - Ahmed Ragheb
- Department of General Medicine, College of Medicine; Menofyia University; Egypt
| | - Travis Marfleet
- Department of Microbiology and Immunology, College of Medicine; University of Saskatchewan; Saskatoon SK Canada
| | - Ahmed Shoker
- Department of Medicine, Royal University Hospital; University of Saskatchewan; Saskatoon SK Canada
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Ahmed H, Elbarbry F, Clark B. Mixed Micellar Electrokinetic Chromatographic Analysis of Colistin, Polypeptide Antibiotic, Using Laser-Induced Fluorescence Detection. ACTA ACUST UNITED AC 2012. [DOI: 10.4236/ajac.2012.33031] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
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Asadpour-Zeynali K, Najafi-Marandi P. Bismuth Modified Disposable Pencil-Lead Electrode for Simultaneous Determination of 2-Nitrophenol and 4-Nitrophenol by Net Analyte Signal Standard Addition Method. ELECTROANAL 2011. [DOI: 10.1002/elan.201100103] [Citation(s) in RCA: 44] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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Sirisangtrakul W, Sripanidkulchai B. Interference of Thai traditional medicine (Yahom Ampanthong) on hepatic cytochrome P450 enzymes and pentobarbital-induced sleeping in mice. Pak J Biol Sci 2011; 14:91-98. [PMID: 21916258 DOI: 10.3923/pjbs.2011.91.98] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/31/2023]
Abstract
Yahom Ampanthong, a Thai traditional medicine, is commonly used for treatment of nausea, vomiting and syncope. Its formula is composed of more than 10 medicinal plants. Currently, the herbal-drug interactions were reported among the case of co-administration of traditional and Western medicines, since cytochrome P450 enzymes involve in drug metabolism and affect the drug action. This study aimed to investigate the effects of Yahom extracts on hepatic cytochrome P450 enzymes and pentobarbital-induced sleeping in mice. Powder of Yahom Ampanthong was extracted with three different solvents, i.e., dichloromethane, methanol and distilled water. The activities of CYP1A1, CYP1A2, CYP2B, CYP2E1 and CYP3A4 were determined after the administration of Yahom extracts for 4 weeks. All three extracts significantly inhibited CYP1A1, CYP1A2, CYP2E1 activities. In contrast, only dichloromethane and methanol extracts enhanced CYP2B activity. However, all three extracts did not affect CYP3A4 activity. When compared to the control group, the dichloromethane extract-treated animals showed shorter pentobarbital-induced sleeping time after treatment for 1 and 4 weeks. In conclusion, Yahom Ampanthong extracts modulated hepatic microsomal cytochrome P450 activities and decreased the pentobarbital-induced sleeping time. Therefore, the concomitant administration of Yahom with certain drugs may give rise to the herbal-drug interaction, which may affect the clinical implication of drug actions.
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Affiliation(s)
- Wanna Sirisangtrakul
- Faculty of Pharmaceutical Science, Khon Kaen University, Khon Kaen 40002, Thailand
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Singh RSP, Das U, Dimmock JR, Alcorn J. A general HPLC-UV method for the quantitative determination of curcumin analogues containing the 1,5-diaryl-3-oxo-1,4-pentadienyl pharmacophore in rat biomatrices. J Chromatogr B Analyt Technol Biomed Life Sci 2010; 878:2796-802. [PMID: 20863771 DOI: 10.1016/j.jchromb.2010.08.034] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/29/2010] [Revised: 08/13/2010] [Accepted: 08/24/2010] [Indexed: 01/08/2023]
Abstract
Curcumin and its derivatives generally display favorable cytotoxic activities against a number of cancer cell types. We focus our rational antineoplastic drug design program on curcumin analogues containing the 1,5-diaryl-3-oxo-1,4-pentadienyl pharmacophore. Favorable outcomes from pharmacological screens of this series demanded further pharmacokinetic evaluations to determine their suitability as effective compounds in vivo. To allow such evaluations and to provide a general, sensitive, rapid and simple method for the analysis of compounds containing the 1,5-diaryl-3-oxo-pentadienyl scaffold, we developed an HPLC method with ultraviolet detection for their detection in various biological matrices of a relevant preclinical species, i.e. the rat. Our HPLC method is specific for the analysis of many members in this series in rat blood, plasma, serum and hepatic microsomes following liquid-liquid extraction with TBME (1:30, v/v). The assay procedure involves chromatographic separation on a Zorbax-Eclipse C-18 column under isocratic conditions with the mobile phase consisting of acetonitrile and ammonium acetate buffer (pH 5.0, 10mM) in different ratios depending upon the compound. The method was validated for NC 2083 in rat serum and rat liver microsomes, a potential lead compound, to demonstrate its applicability. The standard curve was linear (r(2)≥0.997) from 50 to 5000ng/mL. Intra- and inter-day precision and accuracy of the method were within USFDA specified limits. The stability of NC 2083 was established in an auto-injector, on bench-top, during freeze-thaw cycles and long-term stability at -80°C for 40 days. The method is suitable for a number of compounds containing the 1,5-diaryl-3-oxo-pentadienyl scaffold with divergent logP values with only minor adjustments in the buffer to acetonitrile ratio of the mobile phase.
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Affiliation(s)
- Ravi Shankar Prasad Singh
- Drug Design and Discovery Research Group, College of Pharmacy and Nutrition, Thorvaldson Building, 110 Science Place, University of Saskatchewan, Saskatoon, Saskatchewan S7N 5C9, Canada
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Elbarbry F, Ragheb A, Attia A, Chibbar R, Marfleet T, Shoker A. Cyclosporine-induced changes in drug metabolizing enzymes in hyperlipemic rabbit kidneys could explain its toxicity. Xenobiotica 2010; 40:772-81. [DOI: 10.3109/00498254.2010.517276] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
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Pegolo S, Merlanti R, Giantin M, Dacasto M, Montesissa C, Capolongo F. High performance liquid chromatography determination of cytochrome P450 1A and 2C activities in bovine liver microsomes. Vet J 2010; 183:81-88. [DOI: 10.1016/j.tvjl.2008.08.006] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/11/2008] [Revised: 07/24/2008] [Accepted: 08/07/2008] [Indexed: 10/21/2022]
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Hewitt AJ, Walker KR, Kobus SM, Poklewska-Koziell M, Reynolds JN, Brien JF. Differential effects of chronic ethanol exposure on cytochrome P450 2E1 and the hypothalamic-pituitary-adrenal axis in the maternal-fetal unit of the guinea pig. Neurotoxicol Teratol 2009; 32:164-70. [PMID: 20006703 DOI: 10.1016/j.ntt.2009.12.002] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/18/2009] [Revised: 11/07/2009] [Accepted: 12/07/2009] [Indexed: 10/20/2022]
Abstract
BACKGROUND Ethanol neurobehavioural teratogenicity is a leading cause of developmental mental deficiency, in which the hippocampus is a target site of injury. The multi-faceted mechanism of ethanol teratogenicity is not completely understood. This study tested the hypothesis that chronic ethanol exposure (CEE), via chronic maternal ethanol administration, increases cytochrome P450 2E1 (CYP2E1) expression and alters hypothalamic-pituitary-adrenal (HPA) axis activity in the maternal-fetal unit during the third-trimester-equivalent of gestation. METHODS Pregnant Dunkin-Hartley-strain guinea pigs received daily oral administration of ethanol (4 g ethanol/kg maternal body weight) or isocaloric-sucrose/pair-feeding (control) throughout gestation (term, about gestational day (GD) 68). On GD 45, 55 and 65, pregnant animals were euthanized 2h after the last daily dose. Maternal and fetal body weights and fetal hippocampal brain weight were determined. Maternal and fetal samples were collected for the determination of liver CYP2E1 enzymatic activity and plasma free cortisol and ACTH concentrations. RESULTS CEE, with maternal blood ethanol concentration of 108-124 mg/dl at 2h after the last dose, decreased fetal hippocampal weight only at GD 65 and had no effect on fetal body weight compared with control. CYP2E1 activity increased with gestational age in the fetal liver microsomal and mitochondrial fractions. CEE increased CYP2E1 activity in the microsomal and mitochondrial fractions of maternal liver at the three gestational ages and in both hepatic subcellular fractions of the GD 65 fetus compared with control. There was a gestational-age-dependent increase in maternal and fetal plasma free cortisol concentrations, but no effect of CEE compared with control. Maternal and fetal plasma ACTH concentrations were unaffected by CEE compared with control, and were virtually unchanged during the third-trimester-equivalent that was studied. CONCLUSION These data demonstrate that, in the pregnant guinea pig, this CEE regimen increases liver CYP2E1 activity, without affecting HPA axis function, in the maternal-fetal unit during near-term gestation. The CEE-induced increase in liver CYP2E1 activity and potential oxidative stress in the maternal-fetal unit may play a role in the pathogenesis of ethanol teratogenicity.
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Affiliation(s)
- Amy J Hewitt
- Department of Pharmacology and Toxicology, Queen's University, Kingston, ON, Canada
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Alcorn J, Elbarbry FA, Allouh MZ, McNamara PJ. Evaluation of the Assumptions of an Ontogeny Model of Rat Hepatic Cytochrome P450 Activity. Drug Metab Dispos 2007; 35:2225-31. [PMID: 17881659 DOI: 10.1124/dmd.107.017590] [Citation(s) in RCA: 16] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/04/2023] Open
Abstract
We previously reported an ontogeny model of hepatic cytochrome P450 (P450) activity that predicts in vivo P450 elimination from in vitro intrinsic clearance. The purpose of this study was to conduct investigations into key assumptions of the P450 ontogeny model using the developing rat model system. We used two developmentally dissimilar enzymes, CYP2E1 and CYP1A2, and male rats (n = 4) at age groups representing critical developmental stages. Total body and liver weights and hepatic microsomal protein contents were measured. Following high-performance liquid chromatography analysis, apparent K(M) and V(max) estimates were calculated using nonlinear regression analysis for CYP2E1- and CYP1A2-mediated chlorzoxazone 6-hydroxylation and methoxyresorufin O-dealkylation, and V(max) estimates for p-nitrophenol and phenacetin hydroxylations, respectively. Hepatic scaling factors and V(max) values provided estimates for infant scaling factors (ISF). The data show microsomal protein contents increased with postnatal age and reached adult values after postnatal day (PD) 7. Apparent K(M) values were similar at all developmental stages except at < or =PD7. Developmental increases in probe substrate V(max) values did not correlate with the biphasic increase in immunoquantifiable P450. The activity of two different probe substrates for each P450 covaried as a function of age. A plot of observed ISF values as a function of age reflected the developmental pattern of rat hepatic P450. In summation, these observations diverge from several of the model's assumptions. Further investigations are required to explain these inconsistencies and to investigate whether the developing rat may provide a predictive paradigm for pediatric risk assessment for P450-mediated elimination processes.
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Affiliation(s)
- Jane Alcorn
- College of Pharmacy and Nutrition, University of Saskatchewan, Saskatoon, SK, Canada.
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Xu J, Yang Q, Qian X, Samuelsson J, Janson JC. Assessment of 4-nitro-1,8-naphthalic anhydride reductase activity in homogenates of bakers’ yeast by reversed-phase high-performance liquid chromatography. J Chromatogr B Analyt Technol Biomed Life Sci 2007; 847:82-7. [PMID: 17070119 DOI: 10.1016/j.jchromb.2006.09.040] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/04/2006] [Revised: 09/08/2006] [Accepted: 09/15/2006] [Indexed: 10/24/2022]
Abstract
A simple reversed-phase high-performance liquid chromatographic (RP-HPLC) method was developed for the simultaneous determination of yield and conversion ratio of 4-nitro-1,8-naphthalic anhydride to 4-amino-1,8-naphthalic anhydride following incubation with a crude bakers' yeast homogenate. The analytes were separated on a C18 column in gradient mode. The detection limit of 4-amino-1,8-naphthalic anhydride is 10ng/microl when using a 10microl sample injection volume. The nitroreductase activity in the homogenate system can be assessed during the bioconversion process. The method can be used for the simultaneous detection of 4-hydroxylamino-1,8-naphthalic anhydride, an intermediate with limited stability.
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Affiliation(s)
- Jianqiang Xu
- Department of Bioscience and Biotechnology, Dalian University of Technology, Dalian 116024, China
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Li FQ, Xu S, Su H, Deng JX, Liu JY, Hu JH. Development of a gradient reversed-phase HPLC method for the determination of sodium ferulate in beagle dog plasma. J Chromatogr B Analyt Technol Biomed Life Sci 2007; 846:319-22. [PMID: 16931190 DOI: 10.1016/j.jchromb.2006.07.051] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/17/2006] [Revised: 07/11/2006] [Accepted: 07/28/2006] [Indexed: 10/24/2022]
Abstract
A gradient reversed-phase HPLC assay has been developed to determine sodium ferulate (SF) in beagle dog plasma with tinidazole as an internal standard. Chromatographic separation was made on a C(18) column using 0.5% acetic acid and acetonitrile (80:20, v/v) as mobile phase. UV detection was performed at 320 nm. The calibration curve for SF was linear in the range of 0.05-10 microg/ml, and the achieved limit of quantification (LOQ) was 51.4 ng/ml. The results of linearity, within- and between-day precision, and accuracy demonstrate that this method is reliable, sensitive and sufficient for in vivo beagle dog pharmacokinetic (PK) studies of SF.
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Affiliation(s)
- Feng-Qian Li
- Department of Pharmaceutical Sciences, Changhai Hospital, Second Military Medical University, Shanghai 200433, China
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