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Horn G, Rappenglück S, Worek F. Inhibition kinetics of acetylcholinesterase and butyrylcholinesterase from various species by 2-(2-cresyl)-4H-1,3,2-benzodioxaphosphorin-2-oxide (CBDP). Toxicol Lett 2024; 396:28-33. [PMID: 38642675 DOI: 10.1016/j.toxlet.2024.04.003] [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: 12/12/2023] [Revised: 04/02/2024] [Accepted: 04/12/2024] [Indexed: 04/22/2024]
Abstract
The aerotoxic syndrome has been associated with exposure to tricresyl phosphate (TCP), which is used as additive in hydraulic fluids and engine lubricants. The toxic metabolite 2-(2-cresyl)-4H-1,3,2-benzodioxaphosphorin-2-oxide (CBDP) is formed from the TCP isomer tri-ortho-cresyl phosphate (TOCP) in vivo and is known to react with the active site serine in acetylcholinesterase (AChE) and butyrylcholinesterase (BChE) resulting in the inhibition of the enzymes. Previous in vitro studies showed pronounced species differences in the inhibition kinetics of cholinesterases by organophosphorus compounds (OP), which must be considered in the development of relevant animal models for the investigation of OP poisoning and the aerotoxic syndrome. The present study was designed to investigate the inhibition kinetics of human, Cynomolgus monkey, pig, mini pig, guinea pig, mouse, and rat AChE as well as BChE by CBDP under standardized conditions. There were similar rate constants for the inhibition (ki) of human, Cynomolgus monkey and mouse AChE by CBDP. In contrast, the ki values obtained for guinea pig, mini pig, pig, and rat AChE were 2.8- to 5.9-fold lower than that of human AChE. The results of the present study confirmed CBDP as one of the most potent inhibitors of human BChE, indicating a ki value of 3.24 ± 0.33 ×108M-1min-1, which was about 1,140-fold higher than that of human AChE. Accordingly, a markedly more pronounced inhibition rate of BChE from the species guinea pig, mini pig, pig, rat, Cynomolgus monkey, and mouse by CBDP was found as compared to those of AChE from the respective sources, indicating 2.0- to 89.6-fold higher ki values.
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Affiliation(s)
- Gabriele Horn
- Bundeswehr Institute of Pharmacology and Toxicology, Neuherbergstrasse 11, 80937 Munich, Germany.
| | - Sebastian Rappenglück
- Bundeswehr Institute of Pharmacology and Toxicology, Neuherbergstrasse 11, 80937 Munich, Germany
| | - Franz Worek
- Bundeswehr Institute of Pharmacology and Toxicology, Neuherbergstrasse 11, 80937 Munich, Germany
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Almalki SG, Alqurashi YE, Alturaiki W, Almawash S, Khan A, Ahmad P, Iqbal D. Antioxidant, LC-MS Analysis, and Cholinesterase Inhibitory Potentials of Phoenix dactylifera Cultivar Khudari: An In Vitro Enzyme Kinetics and In Silico Study. Biomolecules 2023; 13:1474. [PMID: 37892156 PMCID: PMC10605097 DOI: 10.3390/biom13101474] [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: 08/21/2023] [Revised: 09/22/2023] [Accepted: 09/26/2023] [Indexed: 10/29/2023] Open
Abstract
We evaluated the therapeutic potentials of Khudari fruit pulp, a functional food and cultivar of Phoenix dactylifera, against neurological disorders. Our results demonstrate a good amount of phytochemicals (total phenolic content: 17.77 ± 8.21 µg GA/mg extract) with a high antioxidant potential of aqueous extract (DPPH assay IC50 = 235.84 ± 11.65 µg/mL) and FRAP value: 331.81 ± 4.56 µmol. Furthermore, the aqueous extract showed the marked inhibition of cell-free acetylcholinesterase (electric eel) with an IC50 value of 48.25 ± 2.04 µg/mL, and an enzyme inhibition kinetics study revealed that it exhibits mixed inhibition. Thereafter, we listed the 18 best-matched phytochemical compounds present in aqueous extract through LC/MS analysis. The computational study revealed that five out of eighteen predicted compounds can cross the BBB and exert considerable aqueous solubility. where 2-{5-[(1E)-3-methylbuta-1,3-dien-1-yl]-1H-indol-3-yl}ethanol (MDIE) indicates an acceptable LD50. value. A molecular docking study exhibited that the compounds occupied the key residues of acetylcholinesterase with ΔG range between -6.91 and -9.49 kcal/mol, where MDIE has ∆G: -8.67 kcal/mol, which was better than that of tacrine, ∆G: -8.25 kcal/mol. Molecular dynamics analyses of 100 ns supported the stability of the protein-ligand complexes analyzed through RMSD, RMSF, Rg, and SASA parameters. TRP_84 and GLY_442 are the most critical hydrophobic contacts for the complex, although GLU_199 is important for H-bonds. Prime/MM-GBSA showed that the protein-ligand complex formed a stable confirmation. These findings suggest that the aqueous extract of Khudari fruit pulp has significant antioxidant and acetylcholinesterase inhibition potentials, and its compound, MDIE, forms stably with confirmation with the target protein, though this fruit of Khudari dates can be a better functional food for the treatment of Alzheimer's disease. Further investigations are needed to fully understand the therapeutic role of this plant-based compound via in vivo study.
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Affiliation(s)
- Sami G. Almalki
- Department of Medical Laboratory Sciences, College of Applied Medical Sciences, Majmaah University, Majmaah 11952, Saudi Arabia;
| | - Yaser E. Alqurashi
- Department of Biology, College of Science Al-Zulfi, Majmaah University, Al-Majmaah 11952, Saudi Arabia;
| | - Wael Alturaiki
- Department of Medical Laboratory Sciences, College of Applied Medical Sciences, Majmaah University, Majmaah 11952, Saudi Arabia;
| | - Saud Almawash
- Department of Pharmaceutical Sciences, College of Pharmacy, Shaqra University, Shaqra 11961, Saudi Arabia;
| | - Amir Khan
- Oral Medicine and Allied Dental Sciences Department, Faculty of Dentistry, Taif University, Taif 11099, Saudi Arabia;
| | - Parvej Ahmad
- IIRC-5 Clinical Biochemistry and Natural Product Research Laboratory, Integral University, Lucknow 226026, India;
| | - Danish Iqbal
- Department of Health Information Management, College of Applied Medical Sciences, Buraydah Private Colleges, Buraydah 51418, Saudi Arabia
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Sands D, Davis A, Banfield S, Pottie IR, Darvesh S. Solvents and detergents compatible with enzyme kinetic studies of cholinesterases. Chem Biol Interact 2023; 383:110667. [PMID: 37579937 DOI: 10.1016/j.cbi.2023.110667] [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: 06/29/2023] [Revised: 08/02/2023] [Accepted: 08/11/2023] [Indexed: 08/16/2023]
Abstract
Acetylcholinesterase (AChE) and butyrylcholinesterase (BChE) are enzymes that serve a wide range of physiological functions including the hydrolysis of the neurotransmitter acetylcholine and several other xenobiotics. The development of inhibitors for these enzymes has been the focus for the treatment of several conditions, such as Alzheimer's disease. Novel chemical entities are evaluated as potential inhibitors of AChE and BChE using enzyme kinetics. A common issue encountered in these studies is low aqueous solubility of the possible inhibitor. Additives such as cosolvents or detergents can be included in these studies improve the aqueous solubility. Typical cosolvents include acetonitrile or dimethyl sulfoxide while typical detergents include Polysorbate 20 (Tween 20) or 3-((3-cholamidopropyl) dimethylammonio)-1-propanesulfonate (CHAPS). When solubility is not improved, these molecules are often not evaluated further. To address this issue eleven cosolvents and six detergents that could facilitate aqueous solubility were evaluated to understand how they would affect cholinesterase enzymes using Ellman's assay. These studies show that propylene glycol, acetonitrile, methanol, Tween 20, Polysorbate 80 (Tween 80), polyoxyethylene 23 lauryl ether (Brij 35) and polyoxyethylene 10 oleoyl ether (Brij 96v) have the least inhibitory effects towards cholinesterase activity. It is concluded that these cosolvents and detergents should be considered as solubilizing agents for evaluation of potential cholinesterase inhibitors with low aqueous solubility.
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Affiliation(s)
- Dane Sands
- Department of Medical Neuroscience, Dalhousie University, Halifax, Nova Scotia, Canada
| | - Andrew Davis
- Department of Medical Neuroscience, Dalhousie University, Halifax, Nova Scotia, Canada
| | - Scott Banfield
- Department of Medical Neuroscience, Dalhousie University, Halifax, Nova Scotia, Canada
| | - Ian R Pottie
- Department of Chemistry and Physics, Mount St. Vincent University, Halifax, Nova Scotia, Canada; Department of Chemistry, Saint Mary's University, Halifax, Nova Scotia, Canada
| | - Sultan Darvesh
- Department of Medical Neuroscience, Dalhousie University, Halifax, Nova Scotia, Canada; Department of Chemistry and Physics, Mount St. Vincent University, Halifax, Nova Scotia, Canada; Department of Medicine (Geriatric Medicine & Neurology), Halifax, Nova Scotia, Canada.
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Li W, Qi Y, Gao C, Liu Y, Duan J. A sensitive approach for screening acetylcholinesterase inhibition of water samples using ultra-performance liquid chromatography-tandem mass spectrometry. J Chromatogr B Analyt Technol Biomed Life Sci 2022; 1190:123101. [PMID: 35030473 DOI: 10.1016/j.jchromb.2022.123101] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/03/2021] [Revised: 12/08/2021] [Accepted: 01/03/2022] [Indexed: 11/26/2022]
Abstract
A sensitive assay was developed to evaluate inhibitory effects of aqueous solution on acetylcholinesterase (AChE) activity via measuring hydrolysis rates of acetylcholine (ACh) based on ultra-performance liquid chromatography-tandem mass spectrometry (UPLC-MS/MS). Upon having identified precursor ions and product ions of the ACh and its hydrolysis products choline (Ch), the separation chromatogram for these two analytes has been established using a 50 mm reverse-phase BEH Shield RP18 column. The total chromatographic separation time is 7 min; limits of detection (LODs) for ACh and Ch are 0.14 µg L-1 and 0.12 µg L-1, respectively. A simple method for inactivation of AChE and optimization of operational parameters were then sequentially performed. It was found that adjusting solution pH to 2.5 not only can terminate the enzymatic reaction but also solve band shifting and broadening caused by aqueous matrices in chromatographic separation during UPLC-MS/MS detection. Under conditions of 0.00075 U mL-1 AChE, initial concentration of ACh at 100 µg L-1 and 20 min observation time, IC50 values of the proposed assay for chlorpyrifos-oxon, diazoxon, malaoxon, methidathion oxon, omethoate and paraoxon were 3.5 nM, 16.8 nM, 2.4 nM, 6.8 nM, 270 nM and 36.9 nM, respectively. They are 4.5-51.9 times smaller than those reported in a LC-MS based method, and >120 times lower than those obtained by the traditional Ellman method. The results suggested that, the proposed assay significantly increases the sensitivity of commercial AChE. In addition, inhibition efficiencies of three surface waters, a groundwater and four commercial brands of bottled drinking water samples on AChE activity were firstly measured using this UPLC-MS/MS based method. These water samples were proved to have different inhibitory effects on AChE activity, and the inhibition efficiencies dependent on concentrations of dissolved organic carbon (DOC) but are independent of UV absorbance at 254 nm (UV254) values. These results indicate that the proposed method has advantages of high sensitivity over all other conventional methods. It may become a promising AChE inhibition assay for assessing toxicity of aqueous solution containing neurotoxicity contaminants such as organophosphorus pesticides (OPPs) at low levels, or used to evaluate potential inhibition effects of natural waters on AChE activity.
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Affiliation(s)
- Wei Li
- Key Laboratory of Northwest Water Resources, Environment and Ecology, MOE, Xi'an University of Architecture and Technology, 13 Yanta Road, Xi'an 710055 China.
| | - Yikun Qi
- Key Laboratory of Northwest Water Resources, Environment and Ecology, MOE, Xi'an University of Architecture and Technology, 13 Yanta Road, Xi'an 710055 China
| | - Chuan Gao
- Key Laboratory of Northwest Water Resources, Environment and Ecology, MOE, Xi'an University of Architecture and Technology, 13 Yanta Road, Xi'an 710055 China
| | - Yucan Liu
- School of Civil Engineering, Yantai University, 30 Qingquan Road, Yantai 264005, China
| | - Jinming Duan
- Centre for Water Management and Reuse, University of South Australia, Mawson Lakes Campus, SA 5095, Australia.
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Exploring the Binding Pattern of Geraniol with Acetylcholinesterase through In Silico Docking, Molecular Dynamics Simulation, and In Vitro Enzyme Inhibition Kinetics Studies. Cells 2021; 10:cells10123533. [PMID: 34944045 PMCID: PMC8700130 DOI: 10.3390/cells10123533] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/16/2021] [Revised: 11/25/2021] [Accepted: 12/10/2021] [Indexed: 01/01/2023] Open
Abstract
Acetylcholinesterase (AChE) inhibition is a key element in enhancing cholinergic transmission and subsequently relieving major symptoms of several neurological and neuromuscular disorders. Here, the inhibitory potential of geraniol and its mechanism of inhibition against AChE were elucidated in vitro and validated via an in silico study. Our in vitro enzyme inhibition kinetics results show that at increasing concentrations of geraniol and substrate, Vmax did not change significantly, but Km increased, which indicates that geraniol is a competitive inhibitor against AChE with an IC50 value 98.06 ± 3.92 µM. All the parameters of the ADME study revealed that geraniol is an acceptable drug candidate. A docking study showed that the binding energy of geraniol (−5.6 kcal mol−1) was lower than that of acetylcholine (−4.1 kcal mol−1) with AChE, which exhibited around a 12.58-fold higher binding affinity of geraniol. Furthermore, molecular dynamics simulation revealed that the RMSD of AChE alone or in complex with geraniol fluctuated within acceptable limits throughout the simulation. The mean RMSF value of the complex ensures that the overall conformation of the protein remains conserved. The average values of Rg, MolSA, SASA, and PSA of the complex were 3.16 Å, 204.78, 9.13, and 51.58 Å2, respectively. We found that the total SSE of AChE in the complex was 38.84% (α-helix: 26.57% and β-sheets: 12.27%) and remained consistent throughout the simulation. These findings suggest that geraniol remained inside the binding cavity of AChE in a stable conformation. Further in vivo investigation is required to fully characterize the pharmacokinetic properties, optimization of dose administration, and efficacy of this plant-based natural compound.
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Imangaliyeva AN, Sela A, Eltzov E, Poverenov E. The polyaminosaccharide-based buffers as a new type of zwitterionic buffering macromolecules for biochemical applications. Carbohydr Polym 2021; 273:118601. [PMID: 34561001 DOI: 10.1016/j.carbpol.2021.118601] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/11/2021] [Revised: 08/04/2021] [Accepted: 08/19/2021] [Indexed: 11/25/2022]
Abstract
A new type of biocompatible buffers based on zwitterionic polyaminosaccharides is reported. The carboxy- and amino-groups containing carboxymethyl chitosan (CM-CS) was synthesized and reacted with hydrochloric/acetic acid resulting in CM-CS-HCl and CM-CS-HAc buffers with buffering capacity of 20.6 and 15.2 mM/pH. The new buffers were comprehensively characterized for their physicochemical properties and checked on enzymatic reactions of acetylcholinesterase (AChE) and alkaline phosphatase (ALP). Their performance was compared to the phosphate and Tris buffers. The chloride-free, CM-CS-HAc demonstrated excellent buffering activity with Michaelis constants of 0.50 and 1.00 mM and maximum reaction rates of 5.62 and 2.26 μmol/min/mL for AChE and ALP reactions, respectively. Toxicity studies on stress-sensitive bioreporter bacteria verified nontoxicity of CM-CS-HAc. Zwitterionic polyaminosaccharides overcome drawbacks of monomeric buffers, such as interference with enzyme active sites, cell membrane injury and purification difficulties. Therefore, they may become the next generation of effective buffers for biological and biochemical applications.
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Affiliation(s)
- Ainur N Imangaliyeva
- Agro-nanotechnology and Advanced Materials Research Center, Postharvest and Food Sciences Institute, Agricultural Research Organization, The Volcani Institute, Rishon LeZion 7505101, Israel.
| | - Aviad Sela
- Agro-nanotechnology and Advanced Materials Research Center, Postharvest and Food Sciences Institute, Agricultural Research Organization, The Volcani Institute, Rishon LeZion 7505101, Israel; Institute of Biochemistry, Food Science and Nutrition, Robert H. Smith Faculty of Agriculture, Food and Environment, The Hebrew University of Jerusalem, Rehovot 7610001, Israel.
| | - Evgeni Eltzov
- Agro-nanotechnology and Advanced Materials Research Center, Postharvest and Food Sciences Institute, Agricultural Research Organization, The Volcani Institute, Rishon LeZion 7505101, Israel.
| | - Elena Poverenov
- Agro-nanotechnology and Advanced Materials Research Center, Postharvest and Food Sciences Institute, Agricultural Research Organization, The Volcani Institute, Rishon LeZion 7505101, Israel.
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Almeida MP, Kock FVC, de Jesus HCR, Carlos RM, Venâncio T. Probing the acetylcholinesterase inhibitory activity of a novel Ru(II) polypyridyl complex and the supramolecular interaction by (STD)-NMR. J Inorg Biochem 2021; 224:111560. [PMID: 34399231 DOI: 10.1016/j.jinorgbio.2021.111560] [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: 05/06/2021] [Revised: 07/13/2021] [Accepted: 07/30/2021] [Indexed: 10/20/2022]
Abstract
Currently, acetylcholinesterase (AChE) inhibitors are the only anti-Alzheimer drugs commercially available. Despite their wide use those drugs are all dose dependent and their effect last for no longer than two years, with several side effects. The search of novel acetylcholinesterase (AChE) inhibitors remains as the main scientific route. Here we describe the synthesis, characterization, biological activity and an NMR binding-target study of a novel cis-[Ru(Bpy)2(EtPy)2]2+, (RuEtPy), Bpy = 2,2'-bipyridine and EtPy = 4,2-Ethylamino-pyridine) as a potential AChE inhibitor. The classic Ellman's colorimetric assay suggests that the RuEtPy exhibits a high inhibitory activity, following a competitive mechanism, with a remarkable low inhibition constant (Ki ≈ 16.8 μM), together with a IC50 = 39 μM. Hence, we have studied the spatial interactions for this novel candidate towards the human acetylcholinesterase (hAChE) using saturation transfer difference (STD)-NMR, in order to describe the mechanism of the interaction. NMR binding-target results shows that the 4,2-Ethylamino-Pyridine group is spatially closer to hAChE surface chemical arrangement than 2,2' bipyridine counterpart, exerting an efficient intermolecular interaction, with a low dissociation constant (KD ≈ 55 μM), probing that 4,2-Ethylamino-pyridine motif plays a key role in the inhibitory action.
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Affiliation(s)
- Marlon P Almeida
- Chemistry Department of Federal University of São Carlos, São Carlos, SP, Brazil
| | - Flávio V C Kock
- Chemistry Department of Federal University of São Carlos, São Carlos, SP, Brazil
| | - Hugo C R de Jesus
- Chemistry Department of Federal University of São Carlos, São Carlos, SP, Brazil; Centre for Blood Research, Life Sciences Centre, 4.420 Life Sciences Centre, 2350 Health Sciences Mall, University of British Columbia (UBC), Vancouver, Canada
| | - Rose M Carlos
- Chemistry Department of Federal University of São Carlos, São Carlos, SP, Brazil.
| | - Tiago Venâncio
- Chemistry Department of Federal University of São Carlos, São Carlos, SP, Brazil.
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KORKMAZ N. New sandwich-type polymeric potassium-dicyanoargentate(I) complex: synthesis, characterization and enzymatic activity. Turk J Chem 2020; 44:1110-1121. [PMID: 33488216 PMCID: PMC7751906 DOI: 10.3906/kim-2004-42] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/12/2020] [Accepted: 06/15/2020] [Indexed: 12/20/2022] Open
Abstract
Coordination compounds containing dicyanoargentate(I) have remarkable biological potential due to their therapeutic antibacterial, antifungal, antibiofilm, and anticancer properties. In this study, a new dicyanoargentate(I)-based complex was synthesized and characterized by various procedures (elemental, thermal, FT-IR for complex) involving crystal analysis of the complex. In addition, the biological activity of this new compound on the acetylcholinesterase (AChE) enzyme, an important enzyme for the nervous system, was investigated. When the infrared (IR) spectrum of the complex is examined, the OH vibration peak resulting from H2O molecules in the structure at 3948-3337 cm-1 and at 2138 cm-1, along with a CN peak coordinated to Ag, can be seen, indicating that the mass remaining in the thermal degradation of the complex at 1000 ◦ C is the weight corresponding to the metal mixture consisting of K+Ag (calc.: 68.06). The crystal method revealed that the complex has a sandwich-like, polymeric chemical structure with layers formed by K+ cations and [Ag(CN)2H2O]- anions. Therefore, the AChE enzyme has potential therapeutic uses in improving ACh levels in brain cells, in reducing various side effects, and in improving cognitive impairment, especially in advanced Alzheimer's disease patients. In this study, the activity of this newly synthesized complex on AChE was also investigated. As a result of this research, [Ag(CN)2(H2O)K] had 0.0282 ± 0.010 μM Ki values against AChE. The compound was therefore a good inhibitor for the AChE enzyme. This type of compound can be used for the development of novel anticholinesterase drugs.
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Affiliation(s)
- Nesrin KORKMAZ
- Department of Biotechnology, Faculty of Science, Bartın University, BartınTurkey
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Acetylcholinesterase inhibitory activity of a naturally occurring peptide isolated from Boana pulchella (Anura: Hylidae) and its analogs. Amino Acids 2020; 52:387-396. [DOI: 10.1007/s00726-019-02815-1] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/28/2019] [Accepted: 12/22/2019] [Indexed: 02/07/2023]
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Przybyłowska M, Inkielewicz-Stepniak I, Kowalski S, Dzierzbicka K, Demkowicz S, Daśko M. Synthesis and Cholinesterase Inhibitory Activity of N-Phosphorylated/ N-Tiophosphorylated Tacrine. Med Chem 2019; 16:947-957. [PMID: 31309898 DOI: 10.2174/1573406415666190716115524] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/10/2019] [Revised: 07/01/2019] [Accepted: 07/01/2019] [Indexed: 11/22/2022]
Abstract
BACKGROUND Alzheimer's disease (AD) is progressive and irreversible neurodegenerative disorder. Current pharmacotherapy is not able to stop progression of the disease and can only improve cognitive functions. Therefore, new drugs are being sought that will slow down the development of the disease. OBJECTIVE Novel phosphorus and thiophosphorus tacrine derivatives 7-14 were designed, synthesized and their biological activity and molecular modeling was investigated as a new potential anti- Alzheimer's disease (AD) agents. METHODS 9-Chlorotacrine was treated with propane-1,3-diamine in the presence of sodium iodide to yield N1-(1,2,3,4-tetrahydroacridin-9-yl)propane-1,3-diamine 6. Finally, it was treated with corresponding acid ester or thioester to give phosphorus or thiophosphorus tacrine derivative 7-14. All of the obtained final structures were characterized by 1H NMR, 13C NMR, 31P NMR and MS. RESULTS The results of the docking studies showed that the newly designed phosphorus and thiophosphorus tacrine analogs, theoretically possess AChE and BChE-binding ability. Kinetic study showed that 8 and 12 in the series proved to be more potent electric eel AChE (eeAChE) and human (hAChE) inhibitors than tacrine, where 8 inhibited eeAChE three times more than the referenced drug. The highest BChE inhibition revealed 11 and 13. The most active compounds against eeAChE, hAChE and BChE showed mixed type of inhibition. CONCLUSION All new synthesized compound exhibited lower toxicity against neuroblastoma.cell line (SH-SY5Y) in comparison with tacrine. Two analogues in the series, 7 and 9, demonstrated lack of cytotoxicity against hepatocellular cells (hepG2).
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Affiliation(s)
- Maja Przybyłowska
- Department of Organic Chemistry, Gdansk University of Technology, G. Narutowicza 11/12, 80-233 Gdansk, Poland
| | | | - Szymon Kowalski
- Department of Medical Chemistry, Medical University of Gdansk, Debinki 1, 80-211 Gdansk, Poland
| | - Krystyna Dzierzbicka
- Department of Organic Chemistry, Gdansk University of Technology, G. Narutowicza 11/12, 80-233 Gdansk, Poland
| | - Sebastian Demkowicz
- Department of Organic Chemistry, Gdansk University of Technology, G. Narutowicza 11/12, 80-233 Gdansk, Poland
| | - Mateusz Daśko
- Department of Inorganic Chemistry, Gdansk University of Technology, G. Narutowicza 11/12, 80-233 Gdansk, Poland
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Jain U, Khanuja M, Gupta S, Harikumar A, Chauhan N. Pd nanoparticles and molybdenum disulfide (MoS2) integrated sensing platform for the detection of neuromodulator. Process Biochem 2019. [DOI: 10.1016/j.procbio.2019.03.019] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
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12
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Comparative enzymatic studies using ion-selective electrodes. The case of cholinesterases. Talanta 2018; 180:316-322. [DOI: 10.1016/j.talanta.2017.12.029] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/09/2017] [Revised: 12/05/2017] [Accepted: 12/11/2017] [Indexed: 11/23/2022]
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13
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New tacrine dimers with antioxidant linkers as dual drugs: Anti-Alzheimer's and antiproliferative agents. Eur J Med Chem 2017; 138:761-773. [PMID: 28728108 DOI: 10.1016/j.ejmech.2017.06.048] [Citation(s) in RCA: 50] [Impact Index Per Article: 7.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/10/2017] [Revised: 05/12/2017] [Accepted: 06/23/2017] [Indexed: 12/31/2022]
Abstract
We have designed a series of tacrine-based homo- and heterodimers that incorporate an antioxidant tether (selenoureido, chalcogenide) as new dual compounds: for the treatment of Alzheimer's disease and as antiproliferative agents. Symmetrical homodimers bearing a dichalcogenide or selenide-based tether, the best compounds in the series, were found to be strong and highly selective electric eel AChE inhibitors, with inhibition constants within the low nanomolar range. This high inhibitory activity was confirmed on recombinant human AChE for the most interesting derivatives. The three most promising homodimers also showed a good inhibitory activity towards amyloid-β self aggregation. The symmetric disulfide derivative bis[5-(1',2',3',4'-tetrahydroacridin-9'-ylamino)pentyl]disulfide (19) showed the best multipotent profile and was not neurotoxic on immortalized mouse cortical neurons even at 50 μM concentration. These results represent an improvement in activity and selectivity compared to parent tacrine, the first marketed drug against Alzheimer's disease. Title compounds also exhibited excellent in vitro antiproliferative activities against a panel of 6 human tumor cell lines, with GI50 values within the submicromolar range for the most potent derivatives (0.12-0.95 μM); such values represent a spectacular increase compared to currently-used chemotherapeutic agents, such as 5-FU (up to 306-fold) and cisplatin (up to 162-fold). Cell cycle experiments indicated the accumulation of cells in the G1 phase of the cycle, a different mechanism than the reported for cisplatin. The breast cancer cell lines turned out to be the most sensitive one of the panel tested.
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14
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Vandeput M, Parsajoo C, Vanheuverzwijn J, Patris S, Yardim Y, le Jeune A, Sarakbi A, Mertens D, Kauffmann JM. Flow-through enzyme immobilized amperometric detector for the rapid screening of acetylcholinesterase inhibitors by flow injection analysis. J Pharm Biomed Anal 2015; 102:267-75. [DOI: 10.1016/j.jpba.2014.09.012] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/11/2014] [Accepted: 09/09/2014] [Indexed: 12/14/2022]
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Gufford BT, Chen G, Lazarus P, Graf TN, Oberlies NH, Paine MF. Identification of diet-derived constituents as potent inhibitors of intestinal glucuronidation. Drug Metab Dispos 2014; 42:1675-83. [PMID: 25008344 DOI: 10.1124/dmd.114.059451] [Citation(s) in RCA: 39] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/29/2022] Open
Abstract
Drug-metabolizing enzymes within enterocytes constitute a key barrier to xenobiotic entry into the systemic circulation. Furanocoumarins in grapefruit juice are cornerstone examples of diet-derived xenobiotics that perpetrate interactions with drugs via mechanism-based inhibition of intestinal CYP3A4. Relative to intestinal CYP3A4-mediated inhibition, alternate mechanisms underlying dietary substance-drug interactions remain understudied. A working systematic framework was applied to a panel of structurally diverse diet-derived constituents/extracts (n = 15) as inhibitors of intestinal UDP-glucuronosyl transferases (UGTs) to identify and characterize additional perpetrators of dietary substance-drug interactions. Using a screening assay involving the nonspecific UGT probe substrate 4-methylumbelliferone, human intestinal microsomes, and human embryonic kidney cell lysates overexpressing gut-relevant UGT1A isoforms, 14 diet-derived constituents/extracts inhibited UGT activity by >50% in at least one enzyme source, prompting IC(50) determination. The IC(50) values of 13 constituents/extracts (≤10 μM with at least one enzyme source) were well below intestinal tissue concentrations or concentrations in relevant juices, suggesting that these diet-derived substances can inhibit intestinal UGTs at clinically achievable concentrations. Evaluation of the effect of inhibitor depletion on IC(50) determination demonstrated substantial impact (up to 2.8-fold shift) using silybin A and silybin B, two key flavonolignans from milk thistle (Silybum marianum) as exemplar inhibitors, highlighting an important consideration for interpretation of UGT inhibition in vitro. Results from this work will help refine a working systematic framework to identify dietary substance-drug interactions that warrant advanced modeling and simulation to inform clinical assessment.
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Affiliation(s)
- Brandon T Gufford
- Section of Experimental and Systems Pharmacology (B.T.G., M.F.P.) and Department of Pharmaceutical Sciences (G.C., P.L.), Washington State University College of Pharmacy, Spokane, Washington; and Department of Chemistry and Biochemistry, University of North Carolina at Greensboro, Greensboro, North Carolina (T.N.G., N.H.O.)
| | - Gang Chen
- Section of Experimental and Systems Pharmacology (B.T.G., M.F.P.) and Department of Pharmaceutical Sciences (G.C., P.L.), Washington State University College of Pharmacy, Spokane, Washington; and Department of Chemistry and Biochemistry, University of North Carolina at Greensboro, Greensboro, North Carolina (T.N.G., N.H.O.)
| | - Philip Lazarus
- Section of Experimental and Systems Pharmacology (B.T.G., M.F.P.) and Department of Pharmaceutical Sciences (G.C., P.L.), Washington State University College of Pharmacy, Spokane, Washington; and Department of Chemistry and Biochemistry, University of North Carolina at Greensboro, Greensboro, North Carolina (T.N.G., N.H.O.)
| | - Tyler N Graf
- Section of Experimental and Systems Pharmacology (B.T.G., M.F.P.) and Department of Pharmaceutical Sciences (G.C., P.L.), Washington State University College of Pharmacy, Spokane, Washington; and Department of Chemistry and Biochemistry, University of North Carolina at Greensboro, Greensboro, North Carolina (T.N.G., N.H.O.)
| | - Nicholas H Oberlies
- Section of Experimental and Systems Pharmacology (B.T.G., M.F.P.) and Department of Pharmaceutical Sciences (G.C., P.L.), Washington State University College of Pharmacy, Spokane, Washington; and Department of Chemistry and Biochemistry, University of North Carolina at Greensboro, Greensboro, North Carolina (T.N.G., N.H.O.)
| | - Mary F Paine
- Section of Experimental and Systems Pharmacology (B.T.G., M.F.P.) and Department of Pharmaceutical Sciences (G.C., P.L.), Washington State University College of Pharmacy, Spokane, Washington; and Department of Chemistry and Biochemistry, University of North Carolina at Greensboro, Greensboro, North Carolina (T.N.G., N.H.O.)
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Pohanka M. Voltammetric assay of butyrylcholinesterase in plasma samples and its comparison to the standard spectrophotometric test. Talanta 2014; 119:412-6. [DOI: 10.1016/j.talanta.2013.11.045] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/06/2013] [Revised: 11/09/2013] [Accepted: 11/15/2013] [Indexed: 01/10/2023]
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Pohanka M, Adam V, Kizek R. An acetylcholinesterase-based chronoamperometric biosensor for fast and reliable assay of nerve agents. SENSORS 2013; 13:11498-506. [PMID: 23999806 PMCID: PMC3821328 DOI: 10.3390/s130911498] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 07/16/2013] [Revised: 08/19/2013] [Accepted: 08/27/2013] [Indexed: 01/03/2023]
Abstract
The enzyme acetylcholinesterase (AChE) is an important part of cholinergic nervous system, where it stops neurotransmission by hydrolysis of the neurotransmitter acetylcholine. It is sensitive to inhibition by organophosphate and carbamate insecticides, some Alzheimer disease drugs, secondary metabolites such as aflatoxins and nerve agents used in chemical warfare. When immobilized on a sensor (physico-chemical transducer), it can be used for assay of these inhibitors. In the experiments described herein, an AChE- based electrochemical biosensor using screen printed electrode systems was prepared. The biosensor was used for assay of nerve agents such as sarin, soman, tabun and VX. The limits of detection achieved in a measuring protocol lasting ten minutes were 7.41 × 10−12 mol/L for sarin, 6.31 × 10−12 mol/L for soman, 6.17 × 10−11 mol/L for tabun, and 2.19 × 10−11 mol/L for VX, respectively. The assay was reliable, with minor interferences caused by the organic solvents ethanol, methanol, isopropanol and acetonitrile. Isopropanol was chosen as suitable medium for processing lipophilic samples.
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Affiliation(s)
- Miroslav Pohanka
- Faculty of Military Health Sciences, University of Defence, Trebesska 1575, CZ-500 01 Hradec Kralove, Czech Republic
- Karel English College in Brno, Sujanovo namesti 356/1, CZ-602 00 Brno, Czech Republic
- Author to whom correspondence should be addressed; E-Mail: ; Tel.: +420-973-251-519; Fax: +420-495-518-094
| | - Vojtech Adam
- Central European Institute of Technology, Brno University of Technology, Technicka 3058/10, CZ-616 00 Brno, Czech Republic; E-Mails: (V.A.); (R.K.)
- Department of Chemistry and Biochemistry, Faculty of Agronomy, Mendel University in Brno, Zemedelska 1, CZ-613 00 Brno, Czech Republic
| | - Rene Kizek
- Central European Institute of Technology, Brno University of Technology, Technicka 3058/10, CZ-616 00 Brno, Czech Republic; E-Mails: (V.A.); (R.K.)
- Department of Chemistry and Biochemistry, Faculty of Agronomy, Mendel University in Brno, Zemedelska 1, CZ-613 00 Brno, Czech Republic
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Pohanka M. Spectrophotomeric Assay of Aflatoxin B1 Using Acetylcholinesterase Immobilized on Standard Microplates. ANAL LETT 2013. [DOI: 10.1080/00032719.2012.757703] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/03/2023]
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20
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Lin MC, Lin GZ, Shen YF, Jian SY, Hsieh DK, Lin J, Lin G. Synthesis and evaluation of a new series of tri-, di-, and mono-N-alkylcarbamylphloroglucinols as bulky inhibitors of acetylcholinesterase. Chem Res Toxicol 2012; 25:1462-71. [PMID: 22690874 DOI: 10.1021/tx300119a] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
1,3,5-Tri-N-alkylcarbamylphloroglucinols (1-4) are synthesized as a new series of bulky inhibitors of acetylcholinesterase that may block the catalytic triad, the anionic substrate binding site, and the entrance of the enzyme simultaneously. Among three series of phloroglucinol-derived carbamates, tridentate inhibitors 1,3,5-tri-N-alkylcarbamylphloroglucinols (1-4), bidentate inhibitors 3,5-di-N-n-alkylcarbamyloxyphenols (5-8), and monodentate inhibitors 5-N-n-alkylcarbamyloxyresorcinols (9-12), tridentate inhibitors 1-4 are the most potent inhibitors of mouse acetylcholinesterase. When different n-alkylcarbamyl substituents in tridentate inhibitors 1-4 are compared, n-octylcarbamate 1 is the most potent inhibitor of the enzyme. All inhibitors 1-12 are characterized as the pseudo substrate inhibitors of acetylcholinesterase. Thus, tridentate inhibitors 1-4 are supposed to be hydrolyzed to bidentate inhibitors 5-8 after the enzyme catalysis. Subsequently, bidentate inhibitors 5-8 and monodentate inhibitors 9-12 are supposed to yield monodentate inhibitors 9-12 and phloroglucinol, respectively, after the enzyme catalysis. This means that tridentate inhibitors 1-4 may act as long period inhibitors of the enzyme. Therefore, inhibitors 1-4 may be considered as a new methodology to develop the long-acting drug for Alzheimer's disease. Automated dockings of inhibitor 1 into the X-ray crystal structure of acetylcholinesterase suggest that the most suitable configuration of inhibitor 1 to the enzyme binding is the (1,3,5)- (cis,trans,trans)-tricarbamate rotamer. The cis-carbamyl moiety of this rotamer does not bind into the acetyl group binding site of the enzyme but stretches out itself to the entrance. The other two trans-carbmayl moieties of this rotamer bulkily block the tryptophan 86 residue of the enzyme.
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Affiliation(s)
- Ming-Chen Lin
- Division of Internal Medicine, Chung Shan Medical University Hospital, School of Medicine, Chung Shan Medical University, Taichung 402, Taiwan
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Carletti E, Schopfer LM, Colletier JP, Froment MT, Nachon F, Weik M, Lockridge O, Masson P. Reaction of cresyl saligenin phosphate, the organophosphorus agent implicated in aerotoxic syndrome, with human cholinesterases: mechanistic studies employing kinetics, mass spectrometry, and X-ray structure analysis. Chem Res Toxicol 2011; 24:797-808. [PMID: 21438623 PMCID: PMC3118852 DOI: 10.1021/tx100447k] [Citation(s) in RCA: 49] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Aerotoxic syndrome is assumed to be caused by exposure to tricresyl phosphate (TCP), an antiwear additive in jet engine lubricants and hydraulic fluid. CBDP (2-(ortho-cresyl)-4H-1,2,3-benzodioxaphosphoran-2-one) is the toxic metabolite of triortho-cresylphosphate, a component of TCP. Human butyrylcholinesterase (BChE; EC 3.1.1.8) and human acetylcholinesterase (AChE; EC 3.1.1.7) are irreversibly inhibited by CBDP. The bimolecular rate constants of inhibition (k(i)), determined under pseudo-first-order conditions, displayed a biphasic time course of inhibition with k(i) of 1.6 × 10(8) M(-1) min(-1) and 2.7 × 10(7) M(-1) min(-1) for E and E' forms of BChE. The inhibition constants for AChE were 1 to 2 orders of magnitude slower than those for BChE. CBDP-phosphorylated cholinesterases are nonreactivatable due to ultra fast aging. Mass spectrometry analysis showed an initial BChE adduct with an added mass of 170 Da from cresylphosphate, followed by dealkylation to a structure with an added mass of 80 Da. Mass spectrometry in (18)O-water showed that (18)O was incorporated only during the final aging step to form phospho-serine as the final aged BChE adduct. The crystal structure of CBDP-inhibited BChE confirmed that the phosphate adduct is the ultimate aging product. CBDP is the first organophosphorus agent that leads to a fully dealkylated phospho-serine BChE adduct.
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Affiliation(s)
- Eugénie Carletti
- Laboratoire de Biophysique Moléculaire, Institut de Biologie Structurale, 41 rue Jules Horowitz, 38027 Grenoble, France
| | - Lawrence M. Schopfer
- Eppley Institute and Department of Biochemistry and Molecular Biology, University of Nebraska Medical Center, Omaha, Nebraska 68198-5950, USA
| | - Jacques-Philippe Colletier
- Laboratoire de Biophysique Moléculaire, Institut de Biologie Structurale, 41 rue Jules Horowitz, 38027 Grenoble, France
| | - Marie-Thérése Froment
- Département de Toxicologie, Institut de Recherche Biomédicale des Armées (IRBA)-Centre de Recherches du Service de Santé des Armées (CRSSA), 24 av des Marquis du Grésivaudan, 38702 La Tronche, France
| | - Florian Nachon
- Département de Toxicologie, Institut de Recherche Biomédicale des Armées (IRBA)-Centre de Recherches du Service de Santé des Armées (CRSSA), 24 av des Marquis du Grésivaudan, 38702 La Tronche, France
| | - Martin Weik
- Laboratoire de Biophysique Moléculaire, Institut de Biologie Structurale, 41 rue Jules Horowitz, 38027 Grenoble, France
| | - Oksana Lockridge
- Eppley Institute and Department of Biochemistry and Molecular Biology, University of Nebraska Medical Center, Omaha, Nebraska 68198-5950, USA
| | - Patrick Masson
- Laboratoire de Biophysique Moléculaire, Institut de Biologie Structurale, 41 rue Jules Horowitz, 38027 Grenoble, France
- Eppley Institute and Department of Biochemistry and Molecular Biology, University of Nebraska Medical Center, Omaha, Nebraska 68198-5950, USA
- Département de Toxicologie, Institut de Recherche Biomédicale des Armées (IRBA)-Centre de Recherches du Service de Santé des Armées (CRSSA), 24 av des Marquis du Grésivaudan, 38702 La Tronche, France
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Monty CN, Londoño NJ, Masel RI. Non-biological inhibition-based sensing (NIBS) demonstrated for the detection of toxic arsenic compounds. CHEMOSPHERE 2011; 82:1644-1648. [PMID: 21168183 DOI: 10.1016/j.chemosphere.2010.11.042] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/18/2010] [Revised: 11/11/2010] [Accepted: 11/16/2010] [Indexed: 05/30/2023]
Abstract
This work demonstrates the success of a recently developed technique in chemical amplification, non-biological inhibition-based sensing (NIBS), for the detection of toxic arsenic compounds. Screening for toxic arsenic compounds is especially important due to their prevalence in wastewater and water sources. The detection method presented in this work amplifies the chemical response of toxic arsenic compounds by developing a sensor chemistry where the analyte inhibits, rather than enhances, the rate of a catalytic reaction. This technique mimics the work done with enzyme inhibition; however, using non-biological molecules allows for selective detection without the shelf-life issue associated with biological molecules. Using NIBS we find that we can enhance the sensitivity of the system by two orders of magnitude with no apparent loss in selectivity. This work demonstrates the versatility of NIBS, showing that the technique can be of general use for the detection of toxic compounds.
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Affiliation(s)
- Chelsea N Monty
- Department of Chemical and Biomolecular Engineering, University of Akron, Akron, OH 44325, USA.
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Potency determinations of acetylcholinesterase inhibitors using Ellman’s reaction-based assay in screening: Effect of assay variants. Anal Biochem 2011; 408:166-8. [DOI: 10.1016/j.ab.2010.09.018] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/21/2010] [Revised: 09/09/2010] [Accepted: 09/13/2010] [Indexed: 11/18/2022]
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24
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González Tanarro CM, Gütschow M. Hyperbolic mixed-type inhibition of acetylcholinesterase by tetracyclic thienopyrimidines. J Enzyme Inhib Med Chem 2010; 26:350-8. [DOI: 10.3109/14756366.2010.504674] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/14/2023] Open
Affiliation(s)
| | - M. Gütschow
- Pharmaceutical Institute, Pharmaceutical Chemistry I, University of Bonn, Bonn, Germany
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