1
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Radić Z. Connectivity between surface and interior in catalytic subunits of acetylcholinesterases inferred from their X-ray structures. J Neurochem 2024; 168:386-396. [PMID: 36892323 PMCID: PMC10491739 DOI: 10.1111/jnc.15802] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/23/2023] [Revised: 02/23/2023] [Accepted: 02/28/2023] [Indexed: 03/10/2023]
Abstract
Catalytic activity and function of acetylcholinesterase (AChE; EC 3.1.1.7) have been recognized and studied for over a century and its quaternary and primary structures for about half a century, and its tertiary structure has been known for about 33 years. Clear understanding of relationships between the structure and the function is still pending for this enzyme. Hundreds of crystallographic, static snapshots of AChEs from different sources reveal largely one general backbone conformation with narrow entry into the active center gorge, tightly fit to accept one acetylcholine (ACh) molecule, in contrast to its high catalytic turnover. This short review of available X-ray structures of AChEs from electric ray Torpedo californica, mouse and human, finds some limited, yet consistent deviations in conformations of selected secondary structure elements of AChE relevant for its function. The observed conformational diversity of the acyl pocket loop of AChE, unlike the large Ω-loop, appears consistent with structurally dynamic INS data and solution-based SAXS experiments to explain its dominant role in controlling the size of the active center gorge opening, as well as connectivity between the immediate surroundings of the buried active Ser, and catalytically relevant sites on the AChE surface.
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Affiliation(s)
- Zoran Radić
- Skaggs School of Pharmacy and Pharmaceutical Sciences, University of California at San Diego, La Jolla, California, USA
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2
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Mahmoudi N, Fatemi F, Rahmandoust M, Mirzajani F, Ranaei Siadat SO. Development of a carbon quantum dot-based sensor for the detection of acetylcholinesterase and the organophosphate pesticide. Heliyon 2023; 9:e19551. [PMID: 37809678 PMCID: PMC10558800 DOI: 10.1016/j.heliyon.2023.e19551] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/17/2023] [Revised: 08/04/2023] [Accepted: 08/25/2023] [Indexed: 10/10/2023] Open
Abstract
In this study, a proper and reliable fluorometric method is introduced for screening acetylcholinesterase (AChE) and its inhibitors, using carbon quantum dots (CQDs) as the signal reporter. Pure, S-doped, and P-doped CQDs, were synthesized and their recoverable fluorescence quenching properties were observed, when exposed to Hg2+, Cu2+, and Fe3+ quenching ions, respectively. The study on the recovery of their emission showed that after the introduction of another guest substance with a stronger affinity to the quenching ions, their fluorescence is restored. The Design Expert software was employed to compare the performance of the three CQDs, as fluorescent probes, based on their quenching efficiency and the percentage of their emission recovery in the presence of AChE and acetylthiocholine (ATCh). Based on the statistical analysis, among the studied CQDs, S-doped CQD was the most suitable candidate for sensor designing. The detection mechanism for the proposed S-doped CQD-based sensor is as follows: The strong binding of Cu2+ ions to carboxyl groups of S-doped CQD quenches the fluorescence signal. Then, hydrolysis of ATCh into thiocholine (TCh) in the presence of AChE causes fluorescence recovery, due to the stronger affinity of Cu2+ to the TCh, rather than the CQD. Finally, in the presence of malathion and chlorpyrifos inhibitors, AChE loses its ability to hydrolyze ATCh to TCh, so the fluorescence emission remains quenched. Based on the proposed detection technique, the designed sensor showed detection limits of 1.70 ppb and 1.50 ppb for malathion and chlorpyrifos, respectively.
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Affiliation(s)
| | - Fataneh Fatemi
- Protein Research Center, Shahid Beheshti University, Tehran, Iran
| | | | - Fateme Mirzajani
- Protein Research Center, Shahid Beheshti University, Tehran, Iran
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3
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Amir Rawa MS, Nurul Azman NA, Mohamad S, Nogawa T, Wahab HA. In Vitro and In Silico Anti-Acetylcholinesterase Activity from Macaranga tanarius and Syzygium jambos. MOLECULES (BASEL, SWITZERLAND) 2022; 27:molecules27092648. [PMID: 35565998 PMCID: PMC9102781 DOI: 10.3390/molecules27092648] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 03/01/2022] [Revised: 03/23/2022] [Accepted: 04/20/2022] [Indexed: 12/15/2022]
Abstract
Macaranga tanarius (MT) and Syzygium jambos (SJ) are pharmacologically reported to have anti-oxidant, anti-inflammatory, and anti-diabetic effects, and can be neuroprotective agents. Our previous work revealed that MT and SJ exhibited 76.32% and 93.81% inhibition against acetylcholinesterase (AChE) at 50 μg/mL final concentration in their ethyl acetate and hexane fractions, respectively. This study was aimed to investigate the bioactive constituents of MT and SJ and their molecular mechanism toward AChE inhibition. Bioassay-guided isolation afforded prenylflavonoids 1–3 from MT and anacardic acid derivatives 4 and 5 from SJ that were confirmed by NMR and MS data. Compound 5 exerted the strongest anti-AChE potential (IC50: 0.54 μM), followed by 1, 4, 3, and 2 (IC50: 1.0, 2.4, 6.8, and 33 μM, respectively). In silico molecular docking revealed 5 formed stronger molecular interactions including three H-bonds than its derivative 4 based on the saturation of their alkyl chains. The addition of a five carbon-prenyl chain in 1 increased the number of binding interactions, justifying its greater activity than derivatives 2 and 3. This research reflects the first report of AChE inhibitors from these species, thereby adding pharmacological values to MT and SJ as potential remedies in neuroprotection.
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Affiliation(s)
- Mira Syahfriena Amir Rawa
- Collaborative Laboratory for Herbal Standardization (CHEST), School of Pharmaceutical Sciences, Universiti Sains Malaysia, George Town 11800, Penang, Malaysia;
- Chemical Biology Research Group, RIKEN Center for Sustainable Resource Science, 2-1 Hirosawa, Wako 351-0198, Saitama, Japan
- USM-RIKEN Interdisciplinary Collaboration for Advanced Sciences (URICAS), Universiti Sains Malaysia, George Town 11800, Penang, Malaysia; (N.A.N.A.); (S.M.)
| | - Nurul Amira Nurul Azman
- USM-RIKEN Interdisciplinary Collaboration for Advanced Sciences (URICAS), Universiti Sains Malaysia, George Town 11800, Penang, Malaysia; (N.A.N.A.); (S.M.)
| | - Suriani Mohamad
- USM-RIKEN Interdisciplinary Collaboration for Advanced Sciences (URICAS), Universiti Sains Malaysia, George Town 11800, Penang, Malaysia; (N.A.N.A.); (S.M.)
| | - Toshihiko Nogawa
- Chemical Biology Research Group, RIKEN Center for Sustainable Resource Science, 2-1 Hirosawa, Wako 351-0198, Saitama, Japan
- USM-RIKEN Interdisciplinary Collaboration for Advanced Sciences (URICAS), Universiti Sains Malaysia, George Town 11800, Penang, Malaysia; (N.A.N.A.); (S.M.)
- Correspondence: (T.N.); (H.A.W.); Tel.: +81-048-467-9541 (T.N.); +60-4-657-7888 (H.A.W.)
| | - Habibah A. Wahab
- Collaborative Laboratory for Herbal Standardization (CHEST), School of Pharmaceutical Sciences, Universiti Sains Malaysia, George Town 11800, Penang, Malaysia;
- USM-RIKEN Interdisciplinary Collaboration for Advanced Sciences (URICAS), Universiti Sains Malaysia, George Town 11800, Penang, Malaysia; (N.A.N.A.); (S.M.)
- Correspondence: (T.N.); (H.A.W.); Tel.: +81-048-467-9541 (T.N.); +60-4-657-7888 (H.A.W.)
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4
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Blumenthal DK, Cheng X, Fajer M, Ho KY, Rohrer J, Gerlits O, Taylor P, Juneja P, Kovalevsky A, Radić Z. Covalent inhibition of hAChE by organophosphates causes homodimer dissociation through long-range allosteric effects. J Biol Chem 2021; 297:101007. [PMID: 34324828 PMCID: PMC8384907 DOI: 10.1016/j.jbc.2021.101007] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/29/2021] [Revised: 07/20/2021] [Accepted: 07/23/2021] [Indexed: 11/26/2022] Open
Abstract
Acetylcholinesterase (EC 3.1.1.7), a key acetylcholine-hydrolyzing enzyme in cholinergic neurotransmission, is present in a variety of states in situ, including monomers, C-terminally disulfide-linked homodimers, homotetramers, and up to three tetramers covalently attached to structural subunits. Could oligomerization that ensures high local concentrations of catalytic sites necessary for efficient neurotransmission be affected by environmental factors? Using small-angle X-ray scattering (SAXS) and cryo-EM, we demonstrate that homodimerization of recombinant monomeric human acetylcholinesterase (hAChE) in solution occurs through a C-terminal four-helix bundle at micromolar concentrations. We show that diethylphosphorylation of the active serine in the catalytic gorge or isopropylmethylphosphonylation by the RP enantiomer of sarin promotes a 10-fold increase in homodimer dissociation. We also demonstrate the dissociation of organophosphate (OP)-conjugated dimers is reversed by structurally diverse oximes 2PAM, HI6, or RS194B, as demonstrated by SAXS of diethylphosphoryl-hAChE. However, binding of oximes to the native ligand-free hAChE, binding of high-affinity reversible ligands, or formation of an SP-sarin-hAChE conjugate had no effect on homodimerization. Dissociation monitored by time-resolved SAXS occurs in milliseconds, consistent with rates of hAChE covalent inhibition. OP-induced dissociation was not observed in the SAXS profiles of the double-mutant Y337A/F338A, where the active center gorge volume is larger than in wildtype hAChE. These observations suggest a key role of the tightly packed acyl pocket in allosterically triggered OP-induced dimer dissociation, with the potential for local reduction of acetylcholine-hydrolytic power in situ. Computational models predict allosteric correlated motions extending from the acyl pocket toward the four-helix bundle dimerization interface 25 Å away.
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Affiliation(s)
- Donald K Blumenthal
- Department of Pharmacology and Toxicology, University of Utah, Salt Lake City, Utah, USA
| | - Xiaolin Cheng
- Division of Medicinal Chemistry & Pharmacognosy, College of Pharmacy, The Ohio State University, Columbus, Ohio, USA
| | - Mikolai Fajer
- Division of Medicinal Chemistry & Pharmacognosy, College of Pharmacy, The Ohio State University, Columbus, Ohio, USA
| | - Kwok-Yiu Ho
- Skaggs School of Pharmacy and Pharmaceutical Sciences, UC San Diego, La Jolla, California, USA
| | - Jacqueline Rohrer
- Skaggs School of Pharmacy and Pharmaceutical Sciences, UC San Diego, La Jolla, California, USA
| | - Oksana Gerlits
- Department of Natural Sciences, Tennessee Wesleyan University, Athens, Tennessee, USA
| | - Palmer Taylor
- Skaggs School of Pharmacy and Pharmaceutical Sciences, UC San Diego, La Jolla, California, USA
| | - Puneet Juneja
- Cryo-EM Facility, Iowa State University, Ames, Iowa, USA
| | - Andrey Kovalevsky
- Neutron Scattering Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee, USA
| | - Zoran Radić
- Skaggs School of Pharmacy and Pharmaceutical Sciences, UC San Diego, La Jolla, California, USA.
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5
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Kitagawa DAS, Rodrigues RB, Silva TN, Dos Santos WV, da Rocha VCV, de Almeida JSFD, Bernardo LB, Carvalho-Silva T, Ferreira CN, da Silva AAT, Simas ABC, Nepovimova E, Kuča K, França TCC, Cavalcante SFDA. Design, synthesis, in silico studies and in vitro evaluation of isatin-pyridine oximes hybrids as novel acetylcholinesterase reactivators. J Enzyme Inhib Med Chem 2021; 36:1370-1377. [PMID: 34148470 PMCID: PMC8219220 DOI: 10.1080/14756366.2021.1916009] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/04/2022] Open
Abstract
Organophosphorus poisoning caused by some pesticides and nerve agents is a life-threating condition that must be swiftly addressed to avoid casualties. Despite the availability of medical countermeasures, the clinically available compounds lack a broad spectrum, are not effective towards all organophosphorus toxins, and have poor pharmacokinetics properties to allow them crossing the blood-brain barrier, hampering cholinesterase reactivation at the central nervous system. In this work, we designed and synthesised novel isatin derivatives, linked to a pyridinium 4-oxime moiety by an alkyl chain with improved calculated properties, and tested their reactivation potency against paraoxon- and NEMP-inhibited acetylcholinesterase in comparison to the standard antidote pralidoxime. Our results showed that these compounds displayed comparable in vitro reactivation also pointed by the in silico studies, suggesting that they are promising compounds to tackle organophosphorus poisoning.
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Affiliation(s)
- Daniel A S Kitagawa
- Laboratory of Molecular Modelling Applied to Chemical and Biological Defense (LMACBD), Military Institute of Engineering (IME), Rio de Janeiro, Brazil.,Brazilian Army Technological Center (CTEx), Institute of CBRN Defense (IDQBRN), Rio de Janeiro, Brazil
| | - Rafael B Rodrigues
- Brazilian Army Technological Center (CTEx), Institute of CBRN Defense (IDQBRN), Rio de Janeiro, Brazil
| | - Thiago N Silva
- School of Pharmacy, Universidade Castelo Branco (UCB), Rio de Janeiro, Brazil
| | - Wellington V Dos Santos
- Emergency and Rescue Department (DSE), Rio de Janeiro State Fire Department (CBMERJ), Rio de Janeiro, Brazil.,Universidade Estácio de Sá (UNESA), Rio de Janeiro, Brazil
| | - Vinicius C V da Rocha
- Instituto Federal de Educação, Ciência e Tecnologia do Rio de Janeiro, Nilópolis, Brazil
| | - Joyce S F D de Almeida
- Laboratory of Molecular Modelling Applied to Chemical and Biological Defense (LMACBD), Military Institute of Engineering (IME), Rio de Janeiro, Brazil
| | - Leandro B Bernardo
- Brazilian Army Technological Center (CTEx), Institute of CBRN Defense (IDQBRN), Rio de Janeiro, Brazil
| | - Taynara Carvalho-Silva
- Brazilian Army Technological Center (CTEx), Institute of CBRN Defense (IDQBRN), Rio de Janeiro, Brazil
| | - Cintia N Ferreira
- Brazilian Army Technological Center (CTEx), Institute of CBRN Defense (IDQBRN), Rio de Janeiro, Brazil
| | - Angelo A T da Silva
- Instituto Federal de Educação, Ciência e Tecnologia do Rio de Janeiro, Nilópolis, Brazil
| | - Alessandro B C Simas
- Instituto de Pesquisas de Produtos Naturais Walter Mors (IPPN), Universidade Federal do Rio de Janeiro (UFRJ), Rio de Janeiro, Brazil
| | - Eugenie Nepovimova
- Department of Chemistry, Faculty of Science, University of Hradec Králové, Hradec Králové, Czech Republic
| | - Kamil Kuča
- Department of Chemistry, Faculty of Science, University of Hradec Králové, Hradec Králové, Czech Republic
| | - Tanos C C França
- Laboratory of Molecular Modelling Applied to Chemical and Biological Defense (LMACBD), Military Institute of Engineering (IME), Rio de Janeiro, Brazil.,Department of Chemistry, Faculty of Science, University of Hradec Králové, Hradec Králové, Czech Republic
| | - Samir F de A Cavalcante
- Brazilian Army Technological Center (CTEx), Institute of CBRN Defense (IDQBRN), Rio de Janeiro, Brazil.,School of Pharmacy, Universidade Castelo Branco (UCB), Rio de Janeiro, Brazil.,Instituto de Pesquisas de Produtos Naturais Walter Mors (IPPN), Universidade Federal do Rio de Janeiro (UFRJ), Rio de Janeiro, Brazil.,Department of Chemistry, Faculty of Science, University of Hradec Králové, Hradec Králové, Czech Republic
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6
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Genome of the fatal tapeworm Sparganum proliferum uncovers mechanisms for cryptic life cycle and aberrant larval proliferation. Commun Biol 2021; 4:649. [PMID: 34059788 PMCID: PMC8166898 DOI: 10.1038/s42003-021-02160-8] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/15/2020] [Accepted: 04/29/2021] [Indexed: 12/13/2022] Open
Abstract
The cryptic parasite Sparganum proliferum proliferates in humans and invades tissues and organs. Only scattered cases have been reported, but S. proliferum infection is always fatal. However, S. proliferum’s phylogeny and life cycle remain enigmatic. To investigate the phylogenetic relationships between S. proliferum and other cestode species, and to examine the mechanisms underlying pathogenicity, we sequenced the entire genomes of S. proliferum and a closely related non–life-threatening tapeworm Spirometra erinaceieuropaei. Additionally, we performed larvae transcriptome analyses of S. proliferum plerocercoid to identify genes involved in asexual reproduction in the host. The genome sequences confirmed that the S. proliferum has experienced a clearly distinct evolutionary history from S. erinaceieuropaei. Moreover, we found that nonordinal extracellular matrix coordination allows asexual reproduction in the host, and loss of sexual maturity in S. proliferum are responsible for its fatal pathogenicity to humans. Our high-quality reference genome sequences should be valuable for future studies of pseudophyllidean tapeworm biology and parasitism. Kikuchi et al. sequence the genome of the fatal tapeworm Sparganum proliferum and a closely related non–life-threatening tapeworm Spirometra erinaceieuropaei, and describe its genomic features suggesting the natural history and molecular mechanisms underlying pathogenicity. Their findings indicate that nonordinal extracellular matrix coordination is important for its asexual reproduction, and suggest that loss of sexual maturity contributes to the fatal pathogenicity of S. proliferum to humans.
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7
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Parrino V, De Marco G, Minutoli R, Lo Paro G, Giannetto A, Cappello T, De Plano LM, Cecchini S, Fazio F. Effects of pesticides on Chelon labrosus (Risso, 1827) evaluated by enzymatic activities along the north eastern Sicilian coastlines (Italy). EUROPEAN ZOOLOGICAL JOURNAL 2021. [DOI: 10.1080/24750263.2021.1905090] [Citation(s) in RCA: 9] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
Affiliation(s)
- V. Parrino
- Department of Chemical, Biological, Pharmaceutical and Environmental Sciences, University of Messina, Messina, Italy
| | - G. De Marco
- Department of Chemical, Biological, Pharmaceutical and Environmental Sciences, University of Messina, Messina, Italy
| | - R. Minutoli
- Department of Chemical, Biological, Pharmaceutical and Environmental Sciences, University of Messina, Messina, Italy
| | - G. Lo Paro
- Department of Chemical, Biological, Pharmaceutical and Environmental Sciences, University of Messina, Messina, Italy
| | - A. Giannetto
- Department of Chemical, Biological, Pharmaceutical and Environmental Sciences, University of Messina, Messina, Italy
| | - T. Cappello
- Department of Chemical, Biological, Pharmaceutical and Environmental Sciences, University of Messina, Messina, Italy
| | - L. M. De Plano
- Department of Chemical, Biological, Pharmaceutical and Environmental Sciences, University of Messina, Messina, Italy
| | - S. Cecchini
- Department of Sciences, University of Basilicata, Potenza, Italy
| | - F. Fazio
- Department of Veterinary Sciences, University of Messina, Polo Universitario Annunziata, Messina, Italy
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8
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Ren L, Li H, Liu M, Du J. Light-accelerating oxidase-mimicking activity of black phosphorus quantum dots for colorimetric detection of acetylcholinesterase activity and inhibitor screening. Analyst 2021; 145:8022-8029. [PMID: 33057486 DOI: 10.1039/d0an01917h] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
A feasible and sensitive colorimetric platform was established for the assay of acetylcholinesterase (AChE) activity and evaluation of its inhibitor screening, based upon the light-accelerating oxidase-mimicking activity of black phosphorus quantum dots (BP QDs). The BP QDs were synthesized through a thermal exfoliation method and characterized using various techniques. The BP QDs exhibit oxidase-mimicking catalytic activity on dissolved oxygen-mediating oxidation of 3,3',5,5'-tetramethylbenzidine, a typical substrate of oxidase. This results in a transformation of 3,3',5,5'-tetramethylbenzidine into its blue oxidized product, which has a visible absorption peak at 652 nm. The exposure of 365 nm light irradiation significantly accelerates the oxidase-mimicking activity of the BP QDs and speeds up the reaction efficiency. AChE can specifically catalyze the decomposition of its substrate acetylthiocholine chloride to thiocholine. Thiocholine has reducing capacity and can thus reduce the oxidase-mimicking activity of the BP QDs. As a result, the oxidation of 3,3',5,5'-tetramethylbenzidine is hindered and the blue solution becomes paler. This gives a linear response for AChE ranging from 0.5 to 10.0 mU mL-1 and a detection limit of 0.17 mU mL-1. The assay was successfully applied to evaluate inhibitor screening with neostigmine as the model.
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Affiliation(s)
- Lei Ren
- Key Laboratory of Analytical Chemistry for Life Science of Shaanxi Province, School of Chemistry and Chemical Engineering, Shaanxi Normal University, Xi'an 710119, China.
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9
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Abstract
Herein, I intend to capture highlights shared with my academic and research colleagues over the 60 years I devoted initially to my graduate and postdoctoral training and then to academic endeavors starting as an assistant professor in a new medical school at the University of California, San Diego (UCSD). During this period, the Department of Pharmacology emerged from a division within the Department of Medicine to become the first basic science department, solely within the School of Medicine at UCSD in 1979. As part of the school's plans to reorganize and to retain me at UCSD, I was appointed as founding chair. Some years later in 2002, faculty, led largely within the Department of Pharmacology and by practicing pharmacists within UCSD Healthcare, started the independent Skaggs School of Pharmacy and Pharmaceutical Sciences with a doctor of pharmacy (PharmD) program, where I served as the founding dean. My career pathway, from working at my family-owned pharmacy to chairing a department in a school of medicine and then becoming the dean of a school of pharmacy at a research-intensive, student-centered institution, involved some risky decisions. But the academic, curricular, and accreditation challenges posed were met by a cadre of creative faculty colleagues. I offer my experiences to individuals confronted with a multiplicity of real or imagined opportunities in academic health sciences, the related pharmaceutical industry, and government oversight agencies.
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Affiliation(s)
- Palmer Taylor
- Department of Pharmacology, Skaggs School of Pharmacy and Pharmaceutical Sciences, and School of Medicine, University of California, San Diego, La Jolla, California 92093, USA
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10
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Cavalcante SFDA, Simas ABC, Barcellos MC, de Oliveira VGM, Sousa RB, Cabral PADM, Kuča K, França TCC. Acetylcholinesterase: The "Hub" for Neurodegenerative Diseases and Chemical Weapons Convention. Biomolecules 2020; 10:E414. [PMID: 32155996 PMCID: PMC7175162 DOI: 10.3390/biom10030414] [Citation(s) in RCA: 14] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/16/2020] [Revised: 03/02/2020] [Accepted: 03/03/2020] [Indexed: 12/12/2022] Open
Abstract
This article describes acetylcholinesterase (AChE), an enzyme involved in parasympathetic neurotransmission, its activity, and how its inhibition can be pharmacologically useful for treating dementia, caused by Alzheimer's disease, or as a warfare method due to the action of nerve agents. The chemical concepts related to the irreversible inhibition of AChE, its reactivation, and aging are discussed, along with a relationship to the current international legislation on chemical weapons.
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Affiliation(s)
- Samir F. de A. Cavalcante
- Institute of Chemical, Biological, Radiological and Nuclear Defense (IDQBRN), Brazilian Army Technological Center (CTEx), Avenida das Américas 28705, Rio de Janeiro 23020-470, Brazil; (M.C.B.); (V.G.M.d.O.); (R.B.S.); (P.A.d.M.C.)
- Walter Mors Institute of Research on Natural Products (IPPN), Federal University of Rio de Janeiro (UFRJ), CCS, Bloco H, Rio de Janeiro 21941-902, Brazil
- Department of Chemistry, Faculty of Science, University of Hradec Králové, Rokitanskeho 62, 50003 Hradec Králové, Czech Republic
| | - Alessandro B. C. Simas
- Walter Mors Institute of Research on Natural Products (IPPN), Federal University of Rio de Janeiro (UFRJ), CCS, Bloco H, Rio de Janeiro 21941-902, Brazil
| | - Marcos C. Barcellos
- Institute of Chemical, Biological, Radiological and Nuclear Defense (IDQBRN), Brazilian Army Technological Center (CTEx), Avenida das Américas 28705, Rio de Janeiro 23020-470, Brazil; (M.C.B.); (V.G.M.d.O.); (R.B.S.); (P.A.d.M.C.)
| | - Victor G. M. de Oliveira
- Institute of Chemical, Biological, Radiological and Nuclear Defense (IDQBRN), Brazilian Army Technological Center (CTEx), Avenida das Américas 28705, Rio de Janeiro 23020-470, Brazil; (M.C.B.); (V.G.M.d.O.); (R.B.S.); (P.A.d.M.C.)
| | - Roberto B. Sousa
- Institute of Chemical, Biological, Radiological and Nuclear Defense (IDQBRN), Brazilian Army Technological Center (CTEx), Avenida das Américas 28705, Rio de Janeiro 23020-470, Brazil; (M.C.B.); (V.G.M.d.O.); (R.B.S.); (P.A.d.M.C.)
| | - Paulo A. de M. Cabral
- Institute of Chemical, Biological, Radiological and Nuclear Defense (IDQBRN), Brazilian Army Technological Center (CTEx), Avenida das Américas 28705, Rio de Janeiro 23020-470, Brazil; (M.C.B.); (V.G.M.d.O.); (R.B.S.); (P.A.d.M.C.)
| | - Kamil Kuča
- Department of Chemistry, Faculty of Science, University of Hradec Králové, Rokitanskeho 62, 50003 Hradec Králové, Czech Republic
| | - Tanos C. C. França
- Department of Chemistry, Faculty of Science, University of Hradec Králové, Rokitanskeho 62, 50003 Hradec Králové, Czech Republic
- Laboratory of Molecular Modelling Applied to Chemical and Biological Defense (LMACBD), Military Institute of Engineering (IME), Praça General Tibúrcio 80, Rio de Janeiro 22290-270, Brazil
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11
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Amir Rawa MS, Hassan Z, Murugaiyah V, Nogawa T, Wahab HA. Anti-cholinesterase potential of diverse botanical families from Malaysia: Evaluation of crude extracts and fractions from liquid-liquid extraction and acid-base fractionation. JOURNAL OF ETHNOPHARMACOLOGY 2019; 245:112160. [PMID: 31419500 DOI: 10.1016/j.jep.2019.112160] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/24/2019] [Revised: 07/30/2019] [Accepted: 08/12/2019] [Indexed: 06/10/2023]
Abstract
ETHNOPHARMACOLOGICAL RELEVANCE Enhancement of cholinergic functions in the brain via acetylcholinesterase inhibition is one of the main therapeutic strategies to improve symptoms associated with Alzheimer's or related cognitive deficits. There is a pathophysiological correlation between Alzheimer's and Diabetes Mellitus, as well as inflammation and oxidative stress that may cause cognitive decline. AIM OF THE STUDY The present study was intended to evaluate anti-cholinesterase potential of 177 Malaysian plant extracts from 148 species known to have related ethnomedicinal uses such as anti-inflammatory, anti-oxidant, anti-diabetic, epilepsy, headache, memory enhancement and anti-aging. MATERIALS AND METHODS Anti-cholinesterase screening against both acetylcholinesterase (AChE) and butyrylcholinesterase (BChE) enzymes was performed on the basis of in-vitro colorimetric 96-well microplate-based assay method. Potent active plant extracts were subjected to liquid-liquid extraction and acid-base fractionation for further analysis. RESULTS Fifty-seven plant extracts exhibited potent anti-cholinesterase activities (50-100% inhibition) at 200 μg/ml. Majority of the active plants originated from Fabaceae family. Coccoloba uvifera (L.) L. stem extract manifested the lowest IC50 of 3.78 μg/ml for AChE and 5.94 μg/ml for BChE. A few native species including Tetracera indica (Christm. & Panz.) Merr., Cyrtostachys renda Blume and Ixora javanica (Blume) DC. showed cholinesterase inhibition despite limited local medical applications. Further anti-AChE evaluation (50 μg/ml) of 18 potent plant extracts harbored active polar components in butanol and water fractions, except Senna pendula (Willd.) H.S.Irwin & Barneby (leaves and stems), Acacia auriculiformis Benth. (leaves), Artocarpus altilis (Parkinson ex F.A.Zorn) Fosberg (leaves), and Macaranga tanarius (L.) Mull.Arg. (leaves) that showed inhibitory activity in less polar fractions. The acidic extraction of these four plant species improved their inhibition level against AChE. CONCLUSION This study rendered a preliminary overview of anti-cholinesterase activity from diverse Malaysian botanical families in which provided the medical relevance toward these native plant species, especially ones with limited ethnobotanical record or practice.
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Affiliation(s)
- Mira Syahfriena Amir Rawa
- School of Pharmaceutical Sciences, Universiti Sains Malaysia, 11800, Minden, Penang, Malaysia; Chemical Biology Research Group, RIKEN Center for Sustainable Resource Science, 2-1 Hirosawa, Wako, Saitama, 351-0198, Japan; USM-RIKEN Centre for Aging Science (URICAS), Universiti Sains Malaysia, 11800, Minden, Penang, Malaysia
| | - Zurina Hassan
- Centre for Drug Research, Universiti Sains Malaysia, 11800, Minden, Penang, Malaysia
| | - Vikneswaran Murugaiyah
- School of Pharmaceutical Sciences, Universiti Sains Malaysia, 11800, Minden, Penang, Malaysia
| | - Toshihiko Nogawa
- Chemical Biology Research Group, RIKEN Center for Sustainable Resource Science, 2-1 Hirosawa, Wako, Saitama, 351-0198, Japan; USM-RIKEN Centre for Aging Science (URICAS), Universiti Sains Malaysia, 11800, Minden, Penang, Malaysia.
| | - Habibah A Wahab
- School of Pharmaceutical Sciences, Universiti Sains Malaysia, 11800, Minden, Penang, Malaysia; USM-RIKEN Centre for Aging Science (URICAS), Universiti Sains Malaysia, 11800, Minden, Penang, Malaysia.
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12
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Bovine Endometritis and the Inflammatory Peripheral Cholinergic System. Appl Biochem Biotechnol 2019; 190:1242-1256. [PMID: 31735979 DOI: 10.1007/s12010-019-03157-0] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/18/2019] [Accepted: 10/23/2019] [Indexed: 12/17/2022]
Abstract
Endometritis is an inflammation of the endometrium associated with bacterial infection. The pathogenesis of endometritis in cows is still not completely understood. The combined analysis of the markers of inflammation and oxidative stress has contributed to a better understanding of disease mechanisms, but is still unexplored in uterine disorders. Moreover, research provides evidence about an important role of the vagus nerve in regulating the innate immune function through the cholinergic anti-inflammatory pathway in response to bacterial infections. This new pathway has demonstrated a critical role in controlling the inflammatory system. The aim of this study was to evaluate the activity of cholinesterase in total blood, lymphocytes, and serum of dairy cows with clinical and subclinical endometritis. Sixty-one Holstein cows, between 30 and 45 days in milk, were classified into 3 groups of animals: presenting clinical endometritis (n = 22), subclinical endometritis (n = 17), and healthy (n = 22). Mean leukocyte counts did not differ among groups, but the neutrophil number was significantly higher in cows with clinical endometritis than those in healthy animals. Also, serum concentration of interleukin-1beta (pg/mL) was significantly higher in cows with endometritis. The activity of acetylcholinesterase in blood and lymphocytes increased in both groups with endometritis. Animals with endometritis presented an increase in lipid peroxidation, but the antioxidant enzyme activity (catalase levels) was higher in endometritis groups than in normal cows. In conclusion, the inflammatory process of clinical and subclinical endometritis leads to systemic lipid peroxidation despite the compensatory increase of the antioxidant enzyme. These data also provide evidence of an important role of the cholinergic pathway in regulating dairy cows with clinical and subclinical endometritis.
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de A. Cavalcante SF, Simas ABC, Kuča K. Nerve Agents’ Surrogates: Invaluable Tools for Development of Acetylcholinesterase Reactivators. CURR ORG CHEM 2019. [DOI: 10.2174/1385272823666190806114017] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
The use of nerve agents as warfare and in terrorist acts has drawn much attention from the governments and societies. Such toxic organophosphorus compounds are listed in Chemical Weapons Convention as Schedule 1 chemicals. The discussion about the chemical identity of the elusive Novichok agents, more potent compounds than best known G- and V-Agents, which have been implicated in recent rumorous assassination plots, clearly demonstrating the importance of the matter. Furthermore, accidents with pesticides or misuse thereof have been a pressing issue in many countries. In this context, the continued development of novel cholinesterase reactivators, antidotes for organophosphorus poisoning, a rather restricted class of pharmaceutical substances, is warranted. Testing of novel candidates may require use of actual nerve agents. Nonetheless, only a few laboratories comply with the requirements for storing, possession and manipulation of such toxic chemicals. To overcome such limitations, nerve agents’ surrogates may be a useful alternative, as they undergo the same reaction with cholinesterases, yielding similar adducts, allowing assays with novel antidote candidates, among other applications.
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Affiliation(s)
- Samir F. de A. Cavalcante
- Walter Mors Institute of Research on Natural Products (IPPN), Federal University of Rio de Janeiro (UFRJ), Rio de Janeiro, Brazil
| | - Alessandro B. C. Simas
- Walter Mors Institute of Research on Natural Products (IPPN), Federal University of Rio de Janeiro (UFRJ), Rio de Janeiro, Brazil
| | - Kamil Kuča
- Department of Chemistry, Faculty of Science, University of Hradec Kralove, Hradec Kralove, Czech Republic
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14
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In Vitro Evaluation of Neutral Aryloximes as Reactivators for Electrophorus eel Acetylcholinesterase Inhibited by Paraoxon. Biomolecules 2019; 9:biom9100583. [PMID: 31597234 PMCID: PMC6843506 DOI: 10.3390/biom9100583] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/09/2019] [Revised: 10/01/2019] [Accepted: 10/04/2019] [Indexed: 02/08/2023] Open
Abstract
Casualties caused by organophosphorus pesticides are a burden for health systems in developing and poor countries. Such compounds are potent acetylcholinesterase irreversible inhibitors, and share the toxic profile with nerve agents. Pyridinium oximes are the only clinically available antidotes against poisoning by these substances, but their poor penetration into the blood-brain barrier hampers the efficient enzyme reactivation at the central nervous system. In searching for structural factors that may be explored in future SAR studies, we evaluated neutral aryloximes as reactivators for paraoxon-inhibited Electrophorus eel acetylcholinesterase. Our findings may result into lead compounds, useful for development of more active compounds for emergencies and supportive care.
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15
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Cavalcante SFDA, Kitagawa DAS, Rodrigues RB, Bernardo LB, da Silva TN, Dos Santos WV, Correa ABDA, de Almeida JSFD, França TCC, Kuča K, Simas ABC. Synthesis and in vitro evaluation of neutral aryloximes as reactivators of Electrophorus eel acetylcholinesterase inhibited by NEMP, a VX surrogate. Chem Biol Interact 2019; 309:108682. [PMID: 31163137 DOI: 10.1016/j.cbi.2019.05.048] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/27/2019] [Revised: 04/23/2019] [Accepted: 05/27/2019] [Indexed: 01/08/2023]
Abstract
Casualties caused by nerve agents, potent acetylcholinesterase inhibitors, have attracted attention from media recently. Poisoning with these chemicals may be fatal if not correctly addressed. Therefore, research on novel antidotes is clearly warranted. Pyridinium oximes are the only clinically available compounds, but poor penetration into the blood-brain barrier hampers efficient enzyme reactivation at the central nervous system. In searching for structural factors that may be explored in SAR studies, we synthesized and evaluated neutral aryloximes as reactivators for acetylcholinesterase inhibited by NEMP, a VX surrogate. Although few tested compounds reached comparable reactivation results with clinical standards, they may be considered as leads for further optimization.
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Affiliation(s)
- Samir F de A Cavalcante
- Brazilian Army Institute of Chemical, Biological, Radiological and Nuclear Defense (IDQBRN), Avenida das Américas 28705, Rio de Janeiro, 23020-470, Brazil; Walter Mors Institute of Research on Natural Products (IPPN), Federal University of Rio de Janeiro (UFRJ), CCS, Bloco H, Rio de Janeiro, 21941-902, Brazil; University Castelo Branco (UCB), School of Pharmacy, Avenida Santa Cruz 1631, Rio de Janeiro, 21710-255, Brazil; Department of Chemistry, Faculty of Science, University of Hradec Králové, Rokitanskeho 62, 50003, Hradec Králové, Czech Republic.
| | - Daniel A S Kitagawa
- Laboratory of Molecular Modelling Applied to Chemical and Biological Defense (LMACDB), Praça General Tibúrcio 80, Rio de Janeiro, 22290-270, Brazil
| | - Rafael B Rodrigues
- Brazilian Army Institute of Chemical, Biological, Radiological and Nuclear Defense (IDQBRN), Avenida das Américas 28705, Rio de Janeiro, 23020-470, Brazil
| | - Leandro B Bernardo
- Brazilian Army Institute of Chemical, Biological, Radiological and Nuclear Defense (IDQBRN), Avenida das Américas 28705, Rio de Janeiro, 23020-470, Brazil
| | - Thiago N da Silva
- University Castelo Branco (UCB), School of Pharmacy, Avenida Santa Cruz 1631, Rio de Janeiro, 21710-255, Brazil
| | - Wellington V Dos Santos
- Emergency and Rescue Department (DSE), Rio de Janeiro State Fire Department (CBMERJ), Praça São Salvador 4, Rio de Janeiro, 22231-170, Brazil; University Universus Veritas (UNIVERITAS), School of Biomedicine, Rua Marquês de Abrantes 55, Rio de Janeiro, 22230-060, Brazil
| | - Ana Beatriz de A Correa
- Brazilian Army Institute of Chemical, Biological, Radiological and Nuclear Defense (IDQBRN), Avenida das Américas 28705, Rio de Janeiro, 23020-470, Brazil
| | - Joyce S F D de Almeida
- Laboratory of Molecular Modelling Applied to Chemical and Biological Defense (LMACDB), Praça General Tibúrcio 80, Rio de Janeiro, 22290-270, Brazil
| | - Tanos C C França
- Department of Chemistry, Faculty of Science, University of Hradec Králové, Rokitanskeho 62, 50003, Hradec Králové, Czech Republic; Laboratory of Molecular Modelling Applied to Chemical and Biological Defense (LMACDB), Praça General Tibúrcio 80, Rio de Janeiro, 22290-270, Brazil
| | - Kamil Kuča
- Department of Chemistry, Faculty of Science, University of Hradec Králové, Rokitanskeho 62, 50003, Hradec Králové, Czech Republic
| | - Alessandro B C Simas
- Walter Mors Institute of Research on Natural Products (IPPN), Federal University of Rio de Janeiro (UFRJ), CCS, Bloco H, Rio de Janeiro, 21941-902, Brazil.
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Gerlits O, Kong X, Cheng X, Wymore T, Blumenthal DK, Taylor P, Radić Z, Kovalevsky A. Productive reorientation of a bound oxime reactivator revealed in room temperature X-ray structures of native and VX-inhibited human acetylcholinesterase. J Biol Chem 2019; 294:10607-10618. [PMID: 31138650 DOI: 10.1074/jbc.ra119.008725] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/03/2019] [Revised: 05/21/2019] [Indexed: 11/06/2022] Open
Abstract
Exposure to organophosphorus compounds (OPs) may be fatal if untreated, and a clear and present danger posed by nerve agent OPs has become palpable in recent years. OPs inactivate acetylcholinesterase (AChE) by covalently modifying its catalytic serine. Inhibited AChE cannot hydrolyze the neurotransmitter acetylcholine leading to its build-up at the cholinergic synapses and creating an acute cholinergic crisis. Current antidotes, including oxime reactivators that attack the OP-AChE conjugate to free the active enzyme, are inefficient. Better reactivators are sought, but their design is hampered by a conformationally rigid portrait of AChE extracted exclusively from 100K X-ray crystallography and scarcity of structural knowledge on human AChE (hAChE). Here, we present room temperature X-ray structures of native and VX-phosphonylated hAChE with an imidazole-based oxime reactivator, RS-170B. We discovered that inhibition with VX triggers substantial conformational changes in bound RS-170B from a "nonproductive" pose (the reactive aldoxime group points away from the VX-bound serine) in the reactivator-only complex to a "semi-productive" orientation in the VX-modified complex. This observation, supported by concurrent molecular simulations, suggested that the narrow active-site gorge of hAChE may be significantly more dynamic than previously thought, allowing RS-170B to reorient inside the gorge. Furthermore, we found that small molecules can bind in the choline-binding site hindering approach to the phosphorous of VX-bound serine. Our results provide structural and mechanistic perspectives on the reactivation of OP-inhibited hAChE and demonstrate that structural studies at physiologically relevant temperatures can deliver previously overlooked insights applicable for designing next-generation antidotes.
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Affiliation(s)
- Oksana Gerlits
- From the Bredesen Center, University of Tennessee, Knoxville, Tennessee 37996
| | - Xiaotian Kong
- the Division of Medicinal Chemistry and Pharmacognosy, College of Pharmacy, The Ohio State University, Columbus, Ohio 43210
| | - Xiaolin Cheng
- the Division of Medicinal Chemistry and Pharmacognosy, College of Pharmacy, The Ohio State University, Columbus, Ohio 43210
| | - Troy Wymore
- the Department of Chemistry, University of Michigan, Ann Arbor, Michigan 48109
| | - Donald K Blumenthal
- the Department of Pharmacology and Toxicology, University of Utah, Salt Lake City, Utah 84112
| | - Palmer Taylor
- the Skaggs School of Pharmacy and Pharmaceutical Sciences, University of California San Diego, La Jolla, California 92093-0751, and
| | - Zoran Radić
- the Skaggs School of Pharmacy and Pharmaceutical Sciences, University of California San Diego, La Jolla, California 92093-0751, and
| | - Andrey Kovalevsky
- the Neutron Scattering Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831
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17
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Brewster JT, Dell’Acqua S, Thach DQ, Sessler JL. Classics in Chemical Neuroscience: Donepezil. ACS Chem Neurosci 2019; 10:155-167. [PMID: 30372021 DOI: 10.1021/acschemneuro.8b00517] [Citation(s) in RCA: 33] [Impact Index Per Article: 6.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/12/2023] Open
Abstract
The discovery of acetylcholine and acetylcholinesterase provided the first insight into the intricacies of chemical signal transduction and neuronal communication. Further elucidation of the underlying mechanisms led to an attendant leveraging of this knowledge via the synthesis of new therapeutics designed to control aberrant biochemical processes. The central role of the cholinergic system within human memory and learning, as well as its implication in Alzheimer's disease, has made it a point of focus within the neuropharmacology and medicinal chemistry communities. This review is focused on donepezil and covers the background, synthetic routes, structure-activity relationships, binding interactions with acetylcholinesterase, pharmacokinetics and metabolism, efficacy, adverse effects, and historical importance of this leading therapeutic in the treatment of Alzheimer's disease and true Classic in Chemical Neuroscience.
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Affiliation(s)
- James T. Brewster
- Department of Chemistry, The University of Texas at Austin, Austin, Texas 78712-1224, United States
| | - Simone Dell’Acqua
- Department of Chemistry, University of Pavia, Via Taramelli 12, 27100 Pavia, Italy
| | - Danny Q. Thach
- Department of Chemistry, University of California—Berkeley, Berkeley, California 94720, United States
| | - Jonathan L. Sessler
- Department of Chemistry, The University of Texas at Austin, Austin, Texas 78712-1224, United States
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18
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Araújo MC, Assis CRD, Silva KCC, Souza KS, Azevedo RS, Alves MHME, Silva LC, Silva VL, Adam ML, Carvalho Junior LB, Souza Bezerra R, Oliveira MBM. Characterization of brain acetylcholinesterase of bentonic fish Hoplosternum littorale: Perspectives of application in pesticides and metal ions biomonitoring. AQUATIC TOXICOLOGY (AMSTERDAM, NETHERLANDS) 2018; 205:213-226. [PMID: 30408655 DOI: 10.1016/j.aquatox.2018.10.017] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/05/2018] [Revised: 10/25/2018] [Accepted: 10/25/2018] [Indexed: 06/08/2023]
Abstract
Acetylcholinesterase (AChE; EC 3.1.1.7) is a serine hydrolase, whose main function is to modulate neurotransmission at cholinergic synapses. It is, therefore, the primary target of some pesticides and heavy metals. Its inhibition in aquatic organisms has been used as an indicator of the presence of these pollutants in water bodies. The present study aimed to characterize physicochemical and kinetic parameters of brain AChE in the benthic fish Hoplosternum littorale and to analyze the in vitro effects of pesticides (dichlorvos, diazinon, chlorpyrifos, parathion-methyl, temephos, carbaryl, carbofuran, aldicarb, diflubenzuron, novaluron and pyriproxyfen) and metal ions (As3+, Cd2+, Cu2+, Fe2+, Mn2+, Mg2+, K+, Pb2+, Hg2+, Zn2+) investigating the potential of this enzyme as environmental biomarker based on current regulations. Specific substrates and inhibitors have indicated AChE to be the predominant cholinesterase (ChE) in the brain of H. littorale. Peak activity was observed at pH 8.0 and 30 °C. The enzymatic activity is otherwise moderately thermostable (≈ 50% activity at 45 °C). The enzyme can reduce the activation energy of acetylthiocholine hydrolysis reaction to 8.34 kcal mol-1 while reaching a rate enhancement of 106. Among the pesticides under study, dichlorvos presented an IC50 value below the maximum concentrations allowed by legislation. This study presents the first report on the inhibition of brain AChE activity from Siluriformes by the pesticides novaluron and pyriproxyfen. Mercury ion also exerted a strong inhibitory effect on its enzymatic activity. The H. littorale enzyme thus has the potential to function as an in vitro biomarker for the presence of the pesticide dichlorvos as well as mercury in areas of mining and industrial discharge.
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Affiliation(s)
- Marlyete Chagas Araújo
- Laboratório de Enzimologia - LABENZ, Departamento de Bioquímica, Universidade Federal de Pernambuco, Recife, PE, Brasil; Laboratório de Biologia Molecular - BioMol, Departamento de Bioquímica, Universidade Federal de Pernambuco - UFPE, Recife, PE, Brazil
| | - Caio Rodrigo Dias Assis
- Laboratório de Enzimologia - LABENZ, Departamento de Bioquímica, Universidade Federal de Pernambuco, Recife, PE, Brasil; Laboratório de Compostos Orgânicos em Ecossistemas Costeiros e Marinhos - OrganoMAR, Departamento de Oceanografia, Universidade Federal de Pernambuco - UFPE, Recife, PE, Brazil
| | - Kaline Catiely Campos Silva
- Departamento de Educação, Colegiado de Biologia, Universidade do Estado da Bahia - UNEB, Paulo Afonso, BA, Brazil
| | - Kelma Sirleide Souza
- Laboratório de Enzimologia - LABENZ, Departamento de Bioquímica, Universidade Federal de Pernambuco, Recife, PE, Brasil
| | - Rafael Souto Azevedo
- Laboratório de Enzimologia - LABENZ, Departamento de Bioquímica, Universidade Federal de Pernambuco, Recife, PE, Brasil
| | | | - Luciano Clemente Silva
- Laboratório de Enzimologia - LABENZ, Departamento de Bioquímica, Universidade Federal de Pernambuco, Recife, PE, Brasil; Laboratório de Fisiologia Comparada e Comportamento Animal - LabFCCA, Departamento de Fisiologia e Farmacologia, Universidade Federal de Pernambuco - UFPE, Recife, PE, Brazil
| | - Valdir Luna Silva
- Laboratório de Fisiologia Comparada e Comportamento Animal - LabFCCA, Departamento de Fisiologia e Farmacologia, Universidade Federal de Pernambuco - UFPE, Recife, PE, Brazil
| | - Mônica Lúcia Adam
- Centro Acadêmico de Vitória de Santo Antão - CAV, Universidade Federal de Pernambuco - UFPE, Vitória de Santo Antão, PE, Brazil
| | | | - Ranilson Souza Bezerra
- Laboratório de Enzimologia - LABENZ, Departamento de Bioquímica, Universidade Federal de Pernambuco, Recife, PE, Brasil
| | - Maria Betânia Melo Oliveira
- Laboratório de Biologia Molecular - BioMol, Departamento de Bioquímica, Universidade Federal de Pernambuco - UFPE, Recife, PE, Brazil.
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Assis CRD, Linhares AG, Cabrera MP, Oliveira VM, Silva KCC, Marcuschi M, Maciel Carvalho EVM, Bezerra RS, Carvalho LB. Erythrocyte acetylcholinesterase as biomarker of pesticide exposure: new and forgotten insights. ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH INTERNATIONAL 2018; 25:18364-18376. [PMID: 29797194 DOI: 10.1007/s11356-018-2303-9] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/22/2017] [Accepted: 05/11/2018] [Indexed: 06/08/2023]
Abstract
Acetylcholinesterase (AChE) acts on the hydrolysis of acetylcholine, rapidly removing this neurotransmitter at cholinergic synapses and neuromuscular junctions as well as in neuronal growth and differentiation, modulation of cell adhesion ("electrotactins") and aryl-acylamidase activity (AAA). This enzyme is also found in erythrocyte, as 160 kDa dimer that anchors to the plasma membrane via glycophosphatidylinositol. The function of this enzyme in erythrocytes has not yet been elucidated; however, it is suspected to participate in cell-to-cell interactions. Here, a review on erythrocyte AChE characteristics and use as biomarker for organophosphorus and carbamate insecticides is presented since it is the first specific target/barrier of the action of these pesticides, besides plasma butyrylcholinesterase (BChE). However, some past and current methods have disadvantages: (a) not discriminating the activities of AChE and BChE; (b) low accuracy due to interference of hemoglobin in whole blood samples. On the other hand, extraction methods of hemoglobin-free erythrocyte AChE allows: (a) the freezing and transporting of samples; (b) samples free of colorimetric interference; (c) data from only erythrocyte AChE activity; (d) erythrocyte AChE specific activity presents higher correlation with the central nervous system AChE than other peripheral ChEs; (e) slow spontaneous regeneration against anti-ChEs agents of AChE in comparison to BChE, thus increasing the chances of detecting such compounds following longer interval after exposure. As monitoring perspectives, hemoglobin-free methodologies may be promising alternatives to assess the degree of exposure since they are not influenced by this interfering agent.
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Affiliation(s)
- Caio R D Assis
- Laboratório de Enzimologia - LABENZ, Departamento de Bioquímica and Laboratório de Imunopatologia Keizo Asami - LIKA, Universidade Federal de Pernambuco, Recife, Pernambuco, 50670-901, Brazil.
| | - Amanda G Linhares
- Laboratório de Enzimologia - LABENZ, Departamento de Bioquímica and Laboratório de Imunopatologia Keizo Asami - LIKA, Universidade Federal de Pernambuco, Recife, Pernambuco, 50670-901, Brazil
| | - Mariana P Cabrera
- Laboratório de Enzimologia - LABENZ, Departamento de Bioquímica and Laboratório de Imunopatologia Keizo Asami - LIKA, Universidade Federal de Pernambuco, Recife, Pernambuco, 50670-901, Brazil
| | - Vagne M Oliveira
- Laboratório de Tecnologia de Produtos Bioativos, Departamento de Morfologia e Fisiologia Animal, DMFA, Universidade Federal Rural de Pernambuco, Recife, Pernambuco, Brazil
| | - Kaline C C Silva
- Laboratório de Enzimologia - LABENZ, Departamento de Bioquímica and Laboratório de Imunopatologia Keizo Asami - LIKA, Universidade Federal de Pernambuco, Recife, Pernambuco, 50670-901, Brazil
- Universidade Estadual da Bahia, Paulo Afonso, Bahia, Brazil
| | - Marina Marcuschi
- Laboratório de Enzimologia - LABENZ, Departamento de Bioquímica and Laboratório de Imunopatologia Keizo Asami - LIKA, Universidade Federal de Pernambuco, Recife, Pernambuco, 50670-901, Brazil
| | - Elba V M Maciel Carvalho
- Laboratório de Glicoproteínas, Departamento de Bioquímica, Universidade Federal de Pernambuco, Recife, PE, Brazil
| | - Ranilson S Bezerra
- Laboratório de Enzimologia - LABENZ, Departamento de Bioquímica and Laboratório de Imunopatologia Keizo Asami - LIKA, Universidade Federal de Pernambuco, Recife, Pernambuco, 50670-901, Brazil
| | - Luiz B Carvalho
- Laboratório de Enzimologia - LABENZ, Departamento de Bioquímica and Laboratório de Imunopatologia Keizo Asami - LIKA, Universidade Federal de Pernambuco, Recife, Pernambuco, 50670-901, Brazil
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20
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Acetylcholinesterase inhibition by products generated in situ from the transformation of N-arylisomaleimides. Med Chem Res 2017. [DOI: 10.1007/s00044-017-2122-4] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
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21
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Prokić MD, Borković-Mitić SS, Krizmanić II, Mutić JJ, Trifković JĐ, Gavrić JP, Despotović SG, Gavrilović BR, Radovanović TB, Pavlović SZ, Saičić ZS. Bioaccumulation and effects of metals on oxidative stress and neurotoxicity parameters in the frogs from the Pelophylax esculentus complex. ECOTOXICOLOGY (LONDON, ENGLAND) 2016; 25:1531-1542. [PMID: 27629268 DOI: 10.1007/s10646-016-1707-x] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Accepted: 08/08/2016] [Indexed: 06/06/2023]
Abstract
Metals are involved in the formation of reactive oxygen species and can induce oxidative stress. The aim of this study was to assess the effects of several metals on oxidative stress in the skin and muscle of the Pelophylax esculentus "complex" frogs (parental species Pelophylax ridibundus, Pelophylax lessonae, and their hybrid Pelophylax esculentus) that inhabit the wetland Obedska Bara in Serbia, and the potential use of these species as bioindicator organisms in biomonitoring studies. The biomarkers of oxidative stress (SOD, CAT, GSH-Px, GR, GST activities and GSH, SH concentrations) and cholinesterase activity were investigated. The concentrations of nine metals (Fe, Cu, Zn, As, Cd, Cr, Hg, Ni, and Pb) were measured in the water and tissues. Correlations were established between metals and biomarkers in the tissues. The results of metal accumulation distinguished the skin of P. lessonae and muscle of P. ridibundus from other P. esculentus complex species. The oxidative stress biomarkers observed in P. ridibundus and P. esculentus had greater similarity than in P. lessonae. The P. lessonae displayed the highest number of correlations between biomarkers and metals. The results of tissue responses revealed that skin was more susceptible to metal-induced oxidative stress, with only exception of As. In the light of these findings, we can suggest the use of P. esculentus complex species as a biomonitoring species in studies of metal accumulation and metal-induced oxidative stress, but with special emphasis on P. lessonae.
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Affiliation(s)
- Marko D Prokić
- Department of Physiology, Institute for Biological Research "Siniša Stanković", University of Belgrade, Bulevar despota Stefana 142, Belgrade, 11060, Serbia.
| | - Slavica S Borković-Mitić
- Department of Physiology, Institute for Biological Research "Siniša Stanković", University of Belgrade, Bulevar despota Stefana 142, Belgrade, 11060, Serbia
| | - Imre I Krizmanić
- Faculty of Biology, Institute of Zoology, University of Belgrade, Studentski trg 16, Belgrade, 11000, Serbia
| | - Jelena J Mutić
- Faculty of Chemistry, University of Belgrade, Studentski trg 12-16, Belgrade, 11158, Serbia
| | - Jelena Đ Trifković
- Faculty of Chemistry, University of Belgrade, Studentski trg 12-16, Belgrade, 11158, Serbia
| | - Jelena P Gavrić
- Department of Physiology, Institute for Biological Research "Siniša Stanković", University of Belgrade, Bulevar despota Stefana 142, Belgrade, 11060, Serbia
| | - Svetlana G Despotović
- Department of Physiology, Institute for Biological Research "Siniša Stanković", University of Belgrade, Bulevar despota Stefana 142, Belgrade, 11060, Serbia
| | - Branka R Gavrilović
- Department of Physiology, Institute for Biological Research "Siniša Stanković", University of Belgrade, Bulevar despota Stefana 142, Belgrade, 11060, Serbia
| | - Tijana B Radovanović
- Department of Physiology, Institute for Biological Research "Siniša Stanković", University of Belgrade, Bulevar despota Stefana 142, Belgrade, 11060, Serbia
| | - Slađan Z Pavlović
- Department of Physiology, Institute for Biological Research "Siniša Stanković", University of Belgrade, Bulevar despota Stefana 142, Belgrade, 11060, Serbia
| | - Zorica S Saičić
- Department of Physiology, Institute for Biological Research "Siniša Stanković", University of Belgrade, Bulevar despota Stefana 142, Belgrade, 11060, Serbia
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Prokić MD, Borković-Mitić SS, Krizmanić II, Mutić JJ, Vukojević V, Nasia M, Gavrić JP, Despotović SG, Gavrilović BR, Radovanović TB, Pavlović SZ, Saičić ZS. Antioxidative responses of the tissues of two wild populations of Pelophylax kl. esculentus frogs to heavy metal pollution. ECOTOXICOLOGY AND ENVIRONMENTAL SAFETY 2016; 128:21-29. [PMID: 26874985 DOI: 10.1016/j.ecoenv.2016.02.005] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/18/2015] [Revised: 01/20/2016] [Accepted: 02/03/2016] [Indexed: 06/05/2023]
Abstract
Heavy metal pollution of the aquatic environment is of great concern worldwide. Heavy metals are capable of inducing oxidative stress by increasing the formation of reactive oxygen species (ROS), and directly affecting the antioxidant defense system (AOS) in living organisms. The frog Pelophylax kl. esculentus is a semiaquatic species with semipermeable skin and a complex lifecycle, and represents a potentially useful bioindicator organism. The aim of this study was to investigate the accumulation of several heavy metals (Cd, Co, Cr, Cu, Fe, Hg, Ni, Pb and Zn), and their effects on selected parameters of the AOS, including the activities of superoxide dismutase (SOD), catalase (CAT), glutathione peroxidase (GSH-Px), glutathione reductase (GR), phase II biotransformation enzyme glutathione-S-transferase (GST), the total glutathione (GSH) contents and sulfhydryl (SH) group concentrations, as well as cholinesterases (ChEs) activities in the liver, skin and muscle of P. kl. esculentus. Frog samples were collected at two sites (the Danube-Tisza-Danube canal (DTDC) and the river Ponjavica) in Serbia, which are characterized by different levels of metal pollution. Differences between the metal contents in different tissues showed that the skin of frogs from the DTDC accumulated statistically higher concentrations of Cd, Cu, Pb and Zn, while only the Fe concentration was lower. No significant differences between metal concentrations in muscle tissues of frogs from the DTDC and Ponjavica were observed. Examination of the parameters of the AOS revealed that frogs from the DTDC had higher concentrations of GSH in the liver and of SH groups in the skin and muscle, whereas the activities of the antioxidative enzymes SOD, GHS-Px and GR in the liver and of GR in the skin were lower than in frogs from the Ponjavica. The relationship between metal concentrations and AOS parameters showed the highest number of correlations with GSH, GR and CAT, and with Ni, Zn, Hg, Cr and Cd. Based on the results in this study, we concluded that increased concentrations of heavy metals in frog tissues can alter the AOS, which leads to higher concentrations of GSH and SH groups and lower activities of antioxidative enzymes. The response of the AOS to metal pollutants allowed us to make a distinction between different frog tissues, and to conclude that the liver and skin are more suitable for assessing metal-induced oxidative stress in frogs than muscle.
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Affiliation(s)
- Marko D Prokić
- Department of Physiology, Institute for Biological Research "Siniša Stanković", University of Belgrade, Bulevar despota Stefana 142, 11060 Belgrade, Serbia.
| | - Slavica S Borković-Mitić
- Department of Physiology, Institute for Biological Research "Siniša Stanković", University of Belgrade, Bulevar despota Stefana 142, 11060 Belgrade, Serbia
| | - Imre I Krizmanić
- Faculty of Biology, Institute of Zoology, University of Belgrade, Studentski trg 16, 11000 Belgrade, Serbia
| | - Jelena J Mutić
- Faculty of Chemistry, University of Belgrade, Studentski trg 12-16, 11158 Belgrade, Serbia
| | - Vesna Vukojević
- Faculty of Chemistry, University of Belgrade, Studentski trg 12-16, 11158 Belgrade, Serbia
| | - Mohammed Nasia
- Faculty of Biology, Chair of Comparative Physiology and Ecophysiology, University of Belgrade, Studentski trg 16, 11000 Belgrade, Serbia
| | - Jelena P Gavrić
- Department of Physiology, Institute for Biological Research "Siniša Stanković", University of Belgrade, Bulevar despota Stefana 142, 11060 Belgrade, Serbia
| | - Svetlana G Despotović
- Department of Physiology, Institute for Biological Research "Siniša Stanković", University of Belgrade, Bulevar despota Stefana 142, 11060 Belgrade, Serbia
| | - Branka R Gavrilović
- Department of Physiology, Institute for Biological Research "Siniša Stanković", University of Belgrade, Bulevar despota Stefana 142, 11060 Belgrade, Serbia
| | - Tijana B Radovanović
- Department of Physiology, Institute for Biological Research "Siniša Stanković", University of Belgrade, Bulevar despota Stefana 142, 11060 Belgrade, Serbia
| | - Slađan Z Pavlović
- Department of Physiology, Institute for Biological Research "Siniša Stanković", University of Belgrade, Bulevar despota Stefana 142, 11060 Belgrade, Serbia
| | - Zorica S Saičić
- Department of Physiology, Institute for Biological Research "Siniša Stanković", University of Belgrade, Bulevar despota Stefana 142, 11060 Belgrade, Serbia
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Castillo-González AC, Nieto-Cerón S, Pelegrín-Hernández JP, Montenegro MF, Noguera JA, López-Moreno MF, Rodríguez-López JN, Vidal CJ, Hellín-Meseguer D, Cabezas-Herrera J. Dysregulated cholinergic network as a novel biomarker of poor prognostic in patients with head and neck squamous cell carcinoma. BMC Cancer 2015; 15:385. [PMID: 25956553 PMCID: PMC4435806 DOI: 10.1186/s12885-015-1402-y] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/29/2014] [Accepted: 04/29/2015] [Indexed: 01/03/2023] Open
Abstract
BACKGROUND In airways, a proliferative effect is played directly by cholinergic agonists through nicotinic and muscarinic receptors activation. How tumors respond to aberrantly activated cholinergic signalling is a key question in smoking-related cancer. This research was addressed to explore a possible link of cholinergic signalling changes with cancer biology. METHODS Fifty-seven paired pieces of head and neck squamous cell carcinoma (HNSCC) and adjacent non-cancerous tissue (ANCT) were compared for their mRNA levels for ACh-related proteins and ACh-hydrolyzing activity. RESULTS The measurement in ANCT of acetylcholinesterase (AChE) and butyrylcholinesterase (BChE) activities (5.416 ± 0.501 mU/mg protein and 6.350 ± 0.599 mU/mg protein, respectively) demonstrated that upper respiratory tract is capable of controlling the availability of ACh. In HNSCC, AChE and BChE activities dropped to 3.584 ± 0.599 mU/mg protein (p = 0.002) and 3.965 ± 0.423 mU/mg protein (p < 0.001). Moreover, tumours with low AChE activity and high BChE activity were associated with shorter patient overall survival. ANCT and HNSCC differed in mRNA levels for AChE-T, α3, α5, α9 and β2 for nAChR subunits. Tobacco exposure had a great impact on the expression of both AChE-H and AChE-T mRNAs. Unaffected and cancerous pieces contained principal AChE dimers and BChE tetramers. The lack of nerve-born PRiMA-linked AChE agreed with pathological findings on nerve terminal remodelling and loss in HNSCC. CONCLUSIONS Our results suggest that the low AChE activity in HNSCC can be used to predict survival in patients with head and neck cancer. So, the ChE activity level can be used as a reliable prognostic marker.
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Affiliation(s)
- Ana Cristina Castillo-González
- Molecular Therapy and Biomarkers Research Group, Clinical Analysis Service, University Hospital Virgen de la Arrixaca, IMIB-Arrixaca, Ctra Madrid-Cartagena s/n, El Palmar, Murcia, 30120, Spain.
| | - Susana Nieto-Cerón
- Molecular Therapy and Biomarkers Research Group, Clinical Analysis Service, University Hospital Virgen de la Arrixaca, IMIB-Arrixaca, Ctra Madrid-Cartagena s/n, El Palmar, Murcia, 30120, Spain.
| | - Juan Pablo Pelegrín-Hernández
- Otorhinolaryngology Surgical Service, University Hospital Virgen de la Arrixaca IMIB-Arrixaca, Ctra Madrid-Cartagena s/n, El Palmar, Murcia, 30120, Spain.
| | - María Fernanda Montenegro
- Department of Biochemistry and Molecular Biology A, School of Biology, Regional Campus of International Excellence "Campus Mare Nostrum", IMIB-University of Murcia, Murcia, 30100, Spain.
| | - José Antonio Noguera
- Molecular Therapy and Biomarkers Research Group, Clinical Analysis Service, University Hospital Virgen de la Arrixaca, IMIB-Arrixaca, Ctra Madrid-Cartagena s/n, El Palmar, Murcia, 30120, Spain.
| | - María Fuensanta López-Moreno
- Molecular Therapy and Biomarkers Research Group, Clinical Analysis Service, University Hospital Virgen de la Arrixaca, IMIB-Arrixaca, Ctra Madrid-Cartagena s/n, El Palmar, Murcia, 30120, Spain.
| | - José Neptuno Rodríguez-López
- Department of Biochemistry and Molecular Biology A, School of Biology, Regional Campus of International Excellence "Campus Mare Nostrum", IMIB-University of Murcia, Murcia, 30100, Spain.
| | - Cecilio J Vidal
- Department of Biochemistry and Molecular Biology A, School of Biology, Regional Campus of International Excellence "Campus Mare Nostrum", IMIB-University of Murcia, Murcia, 30100, Spain.
| | - Diego Hellín-Meseguer
- Otorhinolaryngology Surgical Service, University Hospital Virgen de la Arrixaca IMIB-Arrixaca, Ctra Madrid-Cartagena s/n, El Palmar, Murcia, 30120, Spain.
| | - Juan Cabezas-Herrera
- Molecular Therapy and Biomarkers Research Group, Clinical Analysis Service, University Hospital Virgen de la Arrixaca, IMIB-Arrixaca, Ctra Madrid-Cartagena s/n, El Palmar, Murcia, 30120, Spain.
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de Assis CRD, Linhares AG, Oliveira VM, França RCP, Santos JF, Marcuschi M, Carvalho EVMM, Bezerra RS, Carvalho LB. Characterization of catalytic efficiency parameters of brain cholinesterases in tropical fish. FISH PHYSIOLOGY AND BIOCHEMISTRY 2014; 40:1659-1668. [PMID: 24980148 DOI: 10.1007/s10695-014-9956-1] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/04/2013] [Accepted: 06/23/2014] [Indexed: 06/03/2023]
Abstract
Brain cholinesterases from four fish (Arapaima gigas, Colossoma macropomum, Rachycentron canadum and Oreochromis niloticus) were characterized using specific substrates and selective inhibitors. Parameters of catalytic efficiency such as activation energy (AE), k(cat) and k(cat)/k(m) as well as rate enhancements produced by these enzymes were estimated by a method using crude extracts described here. Despite the BChE-like activity, specific substrate kinetic analysis pointed to the existence of only acetylcholinesterase (AChE) in brain of the species studied. Selective inhibition suggests that C. macropomum brain AChE presents atypical activity regarding its behavior in the presence of selective inhibitors. AE data showed that the enzymes increased the rate of reactions up to 10(12) in relation to the uncatalyzed reactions. Zymograms showed the presence of AChE isoforms with molecular weights ranging from 202 to 299 kDa. Values of k(cat) and k(cat)/k(m) were similar to those found in the literature.
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Affiliation(s)
- Caio Rodrigo Dias de Assis
- Laboratório de Enzimologia - LABENZ, Departamento de Bioquímica and Laboratório de Imunopatologia Keizo Asami - LIKA, Universidade Federal de Pernambuco, Campus Universitário, Recife, PE, 50670-901, Brazil,
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25
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Chambers C, Luo C, Tong M, Yang Y, Saxena A. Probing the role of amino acids in oxime-mediated reactivation of nerve agent-inhibited human acetylcholinesterase. Toxicol In Vitro 2014; 29:408-14. [PMID: 25451328 DOI: 10.1016/j.tiv.2014.11.001] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/17/2014] [Revised: 10/20/2014] [Accepted: 11/02/2014] [Indexed: 11/25/2022]
Abstract
In this study, we employed site-directed mutagenesis to understand the role of amino acids in the gorge in oxime-induced reactivation of nerve agent-inhibited human (Hu) acetylcholinesterase (AChE). The organophosphorus (OP) nerve agents studied included GA (tabun), GB (sarin), GF (cyclosarin), VX, and VR. The kinetics of reactivation were examined using both the mono-pyridinium oxime 2-PAM and bis-pyridinium oximes MMB4, HI-6, and HLö-7. The second-order reactivation rate constants were used to compare reactivation of nerve agent-inhibited wild-type (WT) and mutant enzymes. Residues including Y72, Y124 and W286 were found to play important roles in reactivation by bis-pyridinium, but not by mono-pyridinium oximes. Residue Y124 also was found to play a key role in reactivation by HI-6 and HLö-7, while E202 was important for reactivation by all oximes. Residue substitutions of F295 by Leu and Y337 by Ala showed enhanced reactivation by bis-pyridinium oximes MMB4, HI-6, and HLö-7, possibly by providing more accessibility of the OP moiety associated at the active-site serine to the oxime. These results are similar to those observed previously with bovine AChE and demonstrate that there is significant similarity between human and bovine AChEs with regard to oxime reactivation.
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Affiliation(s)
- Carolyn Chambers
- Walter Reed Army Institute of Research, Division of Biochemistry, 503 Robert Grant Avenue, Silver Spring, MD 20910-7500, USA; US Military HIV Research Program, Walter Reed Army Institute of Research, Silver Spring, MD 20910-7500, USA
| | - Chunyuan Luo
- Walter Reed Army Institute of Research, Division of Biochemistry, 503 Robert Grant Avenue, Silver Spring, MD 20910-7500, USA
| | - Min Tong
- Walter Reed Army Institute of Research, Division of Biochemistry, 503 Robert Grant Avenue, Silver Spring, MD 20910-7500, USA
| | - Yerie Yang
- Walter Reed Army Institute of Research, Division of Biochemistry, 503 Robert Grant Avenue, Silver Spring, MD 20910-7500, USA
| | - Ashima Saxena
- Walter Reed Army Institute of Research, Division of Biochemistry, 503 Robert Grant Avenue, Silver Spring, MD 20910-7500, USA; US Military HIV Research Program, Walter Reed Army Institute of Research, Silver Spring, MD 20910-7500, USA.
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26
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Gangadhara Reddy K, Madhavi G, Kumara Swamy B. Mobilized lipase enzymatic biosensor for the determination of Chlorfenvinphos and Malathion in contaminated water samples: A voltammetric study. J Mol Liq 2014. [DOI: 10.1016/j.molliq.2014.06.019] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/28/2022]
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27
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Identification and Expression of Acetylcholinesterase in Octopus vulgaris Arm Development and Regeneration: a Conserved Role for ACHE? Mol Neurobiol 2014; 52:45-56. [PMID: 25112677 DOI: 10.1007/s12035-014-8842-2] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/19/2014] [Accepted: 07/30/2014] [Indexed: 01/18/2023]
Abstract
Acetylcholinesterase (ACHE) is a glycoprotein with a key role in terminating synaptic transmission in cholinergic neurons of both vertebrates and invertebrates. ACHE is also involved in the regulation of cell growth and morphogenesis during embryogenesis and regeneration acting through its non-cholinergic sites. The mollusk Octopus vulgaris provides a powerful model for investigating the mechanisms underlying tissue morphogenesis due to its high regenerative power. Here, we performed a comparative investigation of arm morphogenesis during adult arm regeneration and embryonic arm development which may provide insights on the conserved ACHE pathways. In this study, we cloned and characterized O. vulgaris ACHE, finding a single highly conserved ACHE hydrophobic variant, characterized by prototypical catalytic sites and a putative consensus region for a glycosylphosphatidylinositol (GPI)-anchor attachment at the COOH-terminus. We then show that its expression level is correlated to the stage of morphogenesis in both adult and embryonic arm. In particular, ACHE is localized in typical neuronal sites when adult-like arm morphology is established and in differentiating cell locations during the early stages of arm morphogenesis. This possibility is also supported by the presence in the ACHE sequence and model structure of both cholinergic and non-cholinergic sites. This study provides insights into ACHE conserved roles during processes of arm morphogenesis. In addition, our modeling study offers a solid basis for predicting the interaction of the ACHE domains with pharmacological blockers for in vivo investigations. We therefore suggest ACHE as a target for the regulation of tissue morphogenesis.
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Broichhagen J, Jurastow I, Iwan K, Kummer W, Trauner D. Optische Kontrolle der Acetylcholinesterase mit einem schaltbaren Tacrin. Angew Chem Int Ed Engl 2014. [DOI: 10.1002/ange.201403666] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/05/2023]
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Broichhagen J, Jurastow I, Iwan K, Kummer W, Trauner D. Optical Control of Acetylcholinesterase with a Tacrine Switch. Angew Chem Int Ed Engl 2014; 53:7657-60. [DOI: 10.1002/anie.201403666] [Citation(s) in RCA: 67] [Impact Index Per Article: 6.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/24/2014] [Indexed: 12/18/2022]
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30
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Montenegro MF, Nieto-Cerón S, Cabezas-Herrera J, Muñoz-Delgado E, Campoy FJ, Vidal CJ. Most acetylcholinesterase activity of non-nervous tissues and cells arises from the AChE-H transcript. J Mol Neurosci 2013; 53:429-35. [PMID: 24242952 DOI: 10.1007/s12031-013-0172-8] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/30/2013] [Accepted: 11/04/2013] [Indexed: 12/26/2022]
Abstract
While the functional implications of AChE-T, PRiMA and ColQ have been firmly established, those of glypiated AChE remain uncertain. Insights into the physiological meaning of glycosylphosphatidylinositol (GPI)-linked AChE-H were gained by comparing nervous and non-nervous tissues for the amount of AChE mRNA variants they contained. PCR showed that AChE-T mRNA prevailed in the mouse brain, spinal cord, sciatic nerve and muscle, and AChE-H mRNA in the bone marrow and thymus, as well as in the human gut. The similar levels of AChE-T and AChE-H mRNAs in mouse liver and human kidney contrasted with the almost exclusive presence of catalytically active AChE-H in both organs. The absence of PRiMA mRNA in liver suggested that the tetramers made of AChE-T fail to bind to the cell membrane and are secreted due to the lack of PRiMA in non-nervous organs. In contrast, glypiated AChE-H is largely and lastingly bound to the cell membrane. Thus, non-synaptic glypiated AChE-H seems to be the counterpart of synaptic PRiMA-linked AChE-T, the former designed for clearing ACh waves, the latter for confronting ACh bursts, and both for helping to protect cells against the harmful effects of durable nicotinic and muscarinic activation.
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Affiliation(s)
- María Fernanda Montenegro
- Departamento de Bioquímica y Biología Molecular-A, Universidad de Murcia, Regional Campus of International Excellence "Campus Mare Nostrum", Murcia, Spain
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da Cunha Xavier Soares SF, Vieira AA, Delfino RT, Figueroa-Villar JD. NMR determination of Electrophorus electricus acetylcholinesterase inhibition and reactivation by neutral oximes. Bioorg Med Chem 2013; 21:5923-30. [DOI: 10.1016/j.bmc.2013.05.063] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/12/2013] [Revised: 05/21/2013] [Accepted: 05/29/2013] [Indexed: 12/20/2022]
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Ishizuka T, Yoshigae Y, Murayama N, Izumi T. Different hydrolases involved in bioactivation of prodrug-type angiotensin receptor blockers: carboxymethylenebutenolidase and carboxylesterase 1. Drug Metab Dispos 2013; 41:1888-95. [PMID: 23946449 DOI: 10.1124/dmd.113.053595] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022] Open
Abstract
Olmesartan medoxomil (OM) is a prodrug-type angiotensin II type 1 receptor blocker (ARB). We recently identified carboxymethylenebutenolidase homolog (CMBL) as the responsible enzyme for OM bioactivation in humans. In the present study, we compared the bioactivating properties of OM with those of other prodrug-type ARBs, candesartan cilexetil (CC) and azilsartan medoxomil (AM), by focusing on interspecies differences and tissue specificity. In in-vitro experiments with pooled tissue subcellular fractions of mice, rats, monkeys, dogs, and humans, substantial OM-hydrolase activities were observed in cytosols of the liver, intestine, and kidney in all the species tested except for dog intestine, which showed negligible activity, whereas lung cytosols showed relatively low activities compared with the other tissues. AM-hydrolase activities were well correlated with the OM-hydrolase activities. In contrast, liver microsomes exhibited the highest CC-hydrolase activity among various tissue subcellular fractions in all the species tested. As a result of Western blot analysis with the tissue subcellular fractions, the band intensities stained with anti-human CMBL and carboxylesterase 1 (CES1) antibodies well reflected OM- and AM-hydrolase activities and CC-hydrolase activity, respectively, in animals and humans. Recombinant human CMBL and CES1 showed significant AM- and CC-hydrolase activities, respectively, whereas CC hydrolysis was hardly catalyzed with recombinant carboxylesterase 2 (CES2). In conclusion, OM is bioactivated mainly via intestinal and additionally hepatic CMBL not only in humans but also in mice, rats, and monkeys, while CC is bioactivated via hepatic CES1 rather than intestinal enzymes, including CES2. AM is a substrate for CMBL.
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Affiliation(s)
- Tomoko Ishizuka
- Drug Metabolism and Pharmacokinetics Research Laboratories, Daiichi Sankyo Co., Ltd., Tokyo, Japan
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Pardridge WM, Farrell CL. Localization of Blood-Brain Barrier-Specific Antibodies with Immunogold-Silver Enhancement. J Histotechnol 2013. [DOI: 10.1179/his.1993.16.3.249] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/31/2022]
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Linhares A, Assis C, Siqueira M, Bezerra R, Carvalho L. Development of a method for extraction and assay of human erythrocyte acetylcholinesterase and pesticide inhibition. Hum Exp Toxicol 2013; 32:837-45. [DOI: 10.1177/0960327112468906] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
A method of extracting membranes from red blood cells (RBCs) is described, which were in turn used to assay acetylcholinesterase (AChE) activity. The evidence for the enzyme activity was established by selective inhibition using 1,5- bis(4-allyldimethylammoniumphenyl) pentan-3-one dibromide, tetraisopropyl pyrophosphoramide and neostigmine. Blood samples were exposed to three organophosphorus (dichlorvos, chlorpyrifos and diazinon) and two carbamate (carbaryl and carbofuran) pesticides. Afterwards AChE activities in RBC membranes were determined. The concentrations capable to inhibit the enzyme activity by 50% (IC50) for the pesticides were 10.66 µM (dichlorvos), 21.42 µM (chlorpyrifos), 109.98 µM (carbaryl) and 5.44 µM (carbofuran). The results related to 20% enzyme inhibition (level used in the estimation of threshold limits for anticholinesterase compounds) were below those acceptable daily intake values enacted by relevant national and international regulations. These results suggest that the proposed AChE extraction from RBC and assay could be a suitable method for monitoring occupational exposure to pesticides.
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Affiliation(s)
- A.G. Linhares
- Laboratório de Enzimologia – LABENZ, Departamento de Bioquímica and Laboratório de Imunopatologia Keizo Asami, LIKA Universidade Federal de Pernambuco, Recife, PE, Brazil
| | - C.R.D. Assis
- Laboratório de Enzimologia – LABENZ, Departamento de Bioquímica and Laboratório de Imunopatologia Keizo Asami, LIKA Universidade Federal de Pernambuco, Recife, PE, Brazil
| | - M.T. Siqueira
- Instituto de Ciências Biológicas, Universidade de Pernambuco, Recife, PE, Brazil
| | - R.S. Bezerra
- Laboratório de Enzimologia – LABENZ, Departamento de Bioquímica and Laboratório de Imunopatologia Keizo Asami, LIKA Universidade Federal de Pernambuco, Recife, PE, Brazil
| | - L.B. Carvalho
- Laboratório de Enzimologia – LABENZ, Departamento de Bioquímica and Laboratório de Imunopatologia Keizo Asami, LIKA Universidade Federal de Pernambuco, Recife, PE, Brazil
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Chitra L, Kumar CR, Basha HM, Ponne S, Boopathy R. Interaction of metal chelators with different molecular forms of acetylcholinesterase and its significance in Alzheimer's disease treatment. Proteins 2013; 81:1179-91. [DOI: 10.1002/prot.24267] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/26/2012] [Revised: 01/22/2013] [Accepted: 02/06/2013] [Indexed: 01/31/2023]
Affiliation(s)
- Loganathan Chitra
- DRDO-BU Center for Life Sciences; Bharathiar University; Coimbatore; 641 046; Tamil Nadu; India
| | - Chinnadurai Raj Kumar
- Department of Biotechnology; School of Biotechnology and Genetic Engineering; Bharathiar University; Coimbatore; 641 046; Tamil Nadu; India
| | - Haleema M. Basha
- Department of Biotechnology; School of Biotechnology and Genetic Engineering; Bharathiar University; Coimbatore; 641 046; Tamil Nadu; India
| | - Saravanaraman Ponne
- Department of Biotechnology; School of Biotechnology and Genetic Engineering; Bharathiar University; Coimbatore; 641 046; Tamil Nadu; India
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Sezgin Z, Biberoglu K, Chupakhin V, Makhaeva GF, Tacal O. Determination of binding points of methylene blue and cationic phenoxazine dyes on human butyrylcholinesterase. Arch Biochem Biophys 2013; 532:32-8. [PMID: 23353050 DOI: 10.1016/j.abb.2013.01.003] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/17/2012] [Revised: 01/08/2013] [Accepted: 01/10/2013] [Indexed: 10/27/2022]
Abstract
In this study, the binding points of MethB and two structurally-related cationic phenoxazine dyes [meldola blue (MB) and nile blue (NB)] to human butyrylcholinesterase (BChE) were investigated by molecular docking and site directed mutagenesis. The comparative inhibitory effects of MethB, MB and NB on recombinant wild type BChE and six human BChE mutants were spectrophotometrically studied. Kinetic analyses yielded the following information: MethB and MB were found to cause nonlinear inhibition of all recombinant BChEs except Y332A, compatible with a multi-site binding model. On the other hand, MethB and MB caused linear mixed inhibition of Y332A mutant, compatible with a single binding mode. Comparing the inhibitory effects in aspect of Ki values with recombinant wild type BChE (Ki=0.042 μM), MethB was found to be ∼30, 80 and 270-fold less effective as an inhibitor of Y332A, F329A and T120F, respectively. NB caused nonlinear inhibition of all recombinant BChEs. The inhibitory effect of NB on Y332A mutant was ∼370-fold lower, compared to recombinant wild type BChE (Ki=0.006 μM). Considering both kinetic and molecular docking results together, it was concluded that threonine 120, phenylalanine 329 and tyrosine 332 are critical amino acids in binding of cationic phenoxazine/phenothiazine structured ligands to human BChE.
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Affiliation(s)
- Zeynep Sezgin
- Department of Biochemistry, School of Pharmacy, University of Hacettepe, 06100 Ankara, Turkey
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Role of acetylcholinesterase on the structure and function of cholinergic synapses: insights gained from studies on knockout mice. Cell Mol Neurobiol 2011; 31:909-20. [PMID: 21538119 DOI: 10.1007/s10571-011-9690-5] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/03/2011] [Accepted: 04/06/2011] [Indexed: 10/18/2022]
Abstract
Electrophysiological and ultrastructural studies were performed on phrenic nerve-hemidiaphragm preparations isolated from wild-type and acetylcholinesterase (AChE) knockout (KO) mice to determine the compensatory mechanisms manifested by the neuromuscular junction to excess acetylcholine (ACh). The diaphragm was selected since it is the primary muscle of respiration, and it must adapt to allow for survival of the organism in the absence of AChE. Nerve-elicited muscle contractions, miniature endplate potentials (MEPPs) and evoked endplate potentials (EPPs) were recorded by conventional electrophysiological techniques from phrenic nerve-hemidiaphragm preparations isolated from 1.5- to 2-month-old wild-type (AChE(+/+)) or AChE KO (AChE(-/-)) mice. These recordings were chosen to provide a comprehensive assessment of functional alterations of the diaphragm muscle resulting from the absence of AChE. Tension measurements from AChE(-/-) mice revealed that the amplitude of twitch tensions was potentiated, but tetanic tensions underwent a use-dependent decline at frequencies below 70 Hz and above 100 Hz. MEPPs recorded from hemidiaphragms of AChE(-/-) mice showed a reduction in frequency and a prolongation in decay (37%) but no change in amplitude compared to values observed in age-matched wild-type littermates. In contrast, MEPPs recorded from hemidiaphragms of wild-type mice that were exposed for 30 min to the selective AChE inhibitor 5-bis(4-allyldimethyl-ammoniumphenyl)pentane-3-one (BW284C51) exhibited a pronounced increase in amplitude (42%) and a more marked prolongation in decay (76%). The difference between MEPP amplitudes and decays in AChE(-/-) hemidiaphragms and in wild-type hemidiaphragms treated with BW284C51 represents effective adaptation by the former to a high ACh environment. Electron microscopic examination revealed that diaphragm muscles of AChE(-/-) mice had smaller nerve terminals and diminished pre- and post-synaptic surface contacts relative to neuromuscular junctions of AChE(+/+) mice. The morphological changes are suggested to account, in part, for the ability of muscle from AChE(-/-) mice to function in the complete absence of AChE.
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Abstract
About 20 proteins are known to modify their activity upon interaction with C60. Their structures are present in a database that includes more than 1200 protein structures selected as possible targets for drugs and to represent the entire Protein Data Bank. The set was examined with an algorithm that appraises quantitatively the interaction of C60 and the surface of each protein. The redundancy of the set allows to establish the predictive power of the approach that finds explicitly the most probable site where C60 docks on each protein. About 80% of the known fullerene binding proteins fall in the top 10% of scorers. The close match between the model and experiments vouches for the accuracy of the model and validates its predictions. The sites of docking are shown and discussed in view of the existing experimental data available for protein-C60 interaction. A closer exam of the 10 top scorers is discussed in detail. New proteins that can interact with C60 are identified and discussed for possible future applications as drug targets and fullerene derivatives bioconjugate materials.
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Affiliation(s)
- Matteo Calvaresi
- Dipartimento di Chimica "G. Ciamician", Universita' di Bologna, V. F. Selmi 2, 40126 Bologna, Italy.
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Ishizuka T, Fujimori I, Kato M, Noji-Sakikawa C, Saito M, Yoshigae Y, Kubota K, Kurihara A, Izumi T, Ikeda T, Okazaki O. Human carboxymethylenebutenolidase as a bioactivating hydrolase of olmesartan medoxomil in liver and intestine. J Biol Chem 2010; 285:11892-902. [PMID: 20177059 PMCID: PMC2852926 DOI: 10.1074/jbc.m109.072629] [Citation(s) in RCA: 41] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022] Open
Abstract
Olmesartan medoxomil (OM) is a prodrug type angiotensin II type 1 receptor antagonist widely prescribed as an antihypertensive agent. Herein, we describe the identification and characterization of the OM bioactivating enzyme that hydrolyzes the prodrug and converts to its pharmacologically active metabolite olmesartan in human liver and intestine. The protein was purified from human liver cytosol by successive column chromatography and was identified by mass spectrometry to be a carboxymethylenebutenolidase (CMBL) homolog. Human CMBL, whose endogenous function has still not been reported, is a human homolog of Pseudomonas dienelactone hydrolase involved in the bacterial halocatechol degradation pathway. The ubiquitous expression of human CMBL gene transcript in various tissues was observed. The recombinant human CMBL expressed in mammalian cells was clearly shown to activate OM. By comparing the enzyme kinetics and chemical inhibition properties between the recombinant protein and human tissue preparations, CMBL was demonstrated to be the primary OM bioactivating enzyme in the liver and intestine. The recombinant CMBL also converted other prodrugs having the same ester structure as OM, faropenem medoxomil and lenampicillin, to their active metabolites. CMBL exhibited a unique sensitivity to chemical inhibitors, thus, being distinguishable from other known esterases. Site-directed mutagenesis on the putative active residue Cys132 of the recombinant CMBL caused a drastic reduction of the OM-hydrolyzing activity. We report for the first time that CMBL serves as a key enzyme in the bioactivation of OM, hydrolyzing the ester bond of the prodrug type xenobiotics.
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Affiliation(s)
- Tomoko Ishizuka
- Drug Metabolism and Pharmacokinetics Research Laboratories, Daiichi Sankyo Co. Ltd., Tokyo, Japan.
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Yang Z, Chen J, Chen Y, Jiang S. Molecular cloning and characterization of an acetylcholinesterase cDNA in the brown planthopper, Nilaparvata lugens. JOURNAL OF INSECT SCIENCE (ONLINE) 2010; 10:102. [PMID: 20874389 PMCID: PMC3016860 DOI: 10.1673/031.010.10201] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 10/10/2008] [Accepted: 01/02/2009] [Indexed: 05/29/2023]
Abstract
A full cDNA encoding an acetylcholinesterase (AChE, EC 3.1.1.7) was cloned and characterized from the brown planthopper, Nilaparvata lugens Stål (Hemiptera: Delphacidae). The complete cDNA (2467 bp) contains a 1938-bp open reading frame encoding 646 amino acid residues. The amino acid sequence of the AChE deduced from the cDNA consists of 30 residues for a putative signal peptide and 616 residues for the mature protein with a predicted molecular weight of 69,418. The three residues (Ser242, Glu371, and His485) that putatively form the catalytic triad and the six Cys that form intra-subunit disulfide bonds are completely conserved, and 10 out of the 14 aromatic residues lining the active site gorge of the AChE are also conserved. Northern blot analysis of poly(A)+ RNA showed an approximately 2.6-kb transcript, and Southern blot analysis revealed there likely was just a single copy of this gene in N. lugens. The deduced protein sequence is most similar to AChE of Nephotettix cincticeps with 83% amino acid identity. Phylogenetic analysis constructed with 45 AChEs from 30 species showed that the deduced N. lugens AChE formed a cluster with the other 8 insect AChE2s. Additionally, the hypervariable region and amino acids specific to insect AChE2 also existed in the AChE of N. lugens. The results revealed that the AChE cDNA cloned in this work belongs to insect AChE2 subgroup, which is orthologous to Drosophila AChE. Comparison of the AChEs between the susceptible and resistant strains revealed a point mutation, Gly185Ser, is likely responsible for the insensitivity of the AChE to methamidopho in the resistant strain.
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Affiliation(s)
- Zhifan Yang
- College of Life Sciences, Hubei University, Wuhan 430062, China.
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41
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Kaboudin B, Emadi S, Hadizadeh A. Synthesis of novel phosphorothioates and phosphorodithioates and their differential inhibition of cholinesterases. Bioorg Chem 2009; 37:101-5. [DOI: 10.1016/j.bioorg.2009.05.002] [Citation(s) in RCA: 32] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/17/2009] [Revised: 04/27/2009] [Accepted: 05/01/2009] [Indexed: 10/20/2022]
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Delfino RT, Figueroa-Villar JD. Nucleophilic Reactivation of Sarin-Inhibited Acetylcholinesterase: A Molecular Modeling Study. J Phys Chem B 2009; 113:8402-11. [DOI: 10.1021/jp810686k] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Reinaldo T. Delfino
- Seção de Engenharia Química, Instituto Militar de Engenharia, Praça Gen Tibúrcio, 80, Praia Vermelha, 22290-070, Rio de Janeiro - RJ, Brazil
| | - José D. Figueroa-Villar
- Seção de Engenharia Química, Instituto Militar de Engenharia, Praça Gen Tibúrcio, 80, Praia Vermelha, 22290-070, Rio de Janeiro - RJ, Brazil
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Tian T, Weng XC, Song Y, Zhang LX, Zhou X, Wang Y. Medicinal Studies of Dimeric Phenols with Multiple Quaternary-Ammonium Pendant Arms. Chem Biodivers 2007; 4:947-54. [PMID: 17511008 DOI: 10.1002/cbdv.200790084] [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: 11/05/2022]
Abstract
A series of biphenol-derived quaternary ammonium salts, originally developed as DNA-cross-linking agents, and carrying either two (i.e., 1) or four (i.e., 2) net positive charges, were investigated for their in vitro DNA-transcription- and acetylcholinesterase (AChE)-inhibitory activities. The effects of charge and type of linker between the two phenolic residues were systematically investigated. Several compounds showed good activities in both tests, which makes them potential lead candidates for drug design.
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Affiliation(s)
- Tian Tian
- College of Chemistry and Molecular Sciences, Wuhan University, Hubei, Wuhan 430072, PR China
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44
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Law KS, Acey RA, Smith CR, Benton DA, Soroushian S, Eckenrod B, Stedman R, Kantardjieff KA, Nakayama K. Dialkyl phenyl phosphates as novel selective inhibitors of butyrylcholinesterase. Biochem Biophys Res Commun 2007; 355:371-8. [PMID: 17307152 DOI: 10.1016/j.bbrc.2007.01.186] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/18/2007] [Accepted: 01/26/2007] [Indexed: 10/23/2022]
Abstract
A series of dialkyl phenyl phosphates (DAPPs) were synthesized and evaluated in silico and in vitro for inhibitory activity against acetylcholinesterase and butyrylcholinesterase. Among the compounds examined, several DAPPs were shown to be potent inhibitors of butyrylcholinesterase, while having little activity against acetylcholinesterase. The most potent and selective inhibitors were di-n-butyl phenyl phosphate (K(i)=43 microM), di-n-pentyl phenyl phosphate (K(i)=6 microM), and di-cyclohexyl phenyl phosphate (K(i)=7 microM), the first which was shown to be a competitive inhibitor while the latter two being partial competitive inhibitors. Flexible docking simulations suggested that relative binding affinities generally increased as a function of alkyl chain length, while the strength and nature of inhibitory activity depended on whether the compound bound deeply or midway in the active site gorge, or in the proposed peripheral site.
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Affiliation(s)
- Ken-Shing Law
- Department of Chemistry and Biochemistry, California State University-Long Beach, 1250 Bellflower Blvd., Long Beach, CA 90840, USA
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Noureddine H, Schmitt C, Liu W, Garbay C, Massoulié J, Bon S. Assembly of acetylcholinesterase tetramers by peptidic motifs from the proline-rich membrane anchor, PRiMA: competition between degradation and secretion pathways of heteromeric complexes. J Biol Chem 2006; 282:3487-97. [PMID: 17158452 DOI: 10.1074/jbc.m607221200] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022] Open
Abstract
The membrane-bound form of acetylcholinesterase (AChE) constitutes the major component of this enzyme in the mammalian brain. These molecules are hetero-oligomers, composed of four AChE catalytic subunits of type T (AChE(T)), associated with a transmembrane protein of type 1, called PRiMA (proline-rich membrane anchor). PRiMA consists of a signal peptide, an extracellular domain that contains a proline-rich motif (14 prolines with an intervening leucine, P4LP10), a transmembrane domain, and a cytoplasmic domain. Expression of AChE(T) subunits in transfected COS cells with a truncated PRiMA, without its transmembrane and cytoplasmic domains (P(stp54) mutant), produced secreted heteromeric complexes (T4-P(stp54)), instead of membrane-bound tetramers. In this study, we used a series of deletions and point mutations to analyze the interaction between the extracellular domain of PRiMA and AChE(T) subunits. We confirmed the importance of the polyproline stretches and defined a peptidic motif (RP4LP10RL), which induces the assembly and secretion of a heteromeric complex with four AChE(T) subunits, nearly as efficiently as the entire extracellular domain of PRiMA. It is noteworthy that deletion of the N-terminal segment preceding the prolines had little effect. Interestingly, short PRiMA mutants, truncated within the proline-rich motif, reduced both cellular and secreted AChE activity, suggesting that their interaction with AChE(T) subunits induces their intracellular degradation.
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Affiliation(s)
- Hiba Noureddine
- Laboratoire de Neurobiologie Cellulaire et Moléculaire, CNRS UMR 8544, Ecole Normale Supérieure, 46 Rue d'Ulm, 75005 Paris
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Pastorin G, Marchesan S, Hoebeke J, Da Ros T, Ehret-Sabatier L, Briand JP, Prato M, Bianco A. Design and activity of cationic fullerene derivatives as inhibitors of acetylcholinesterase. Org Biomol Chem 2006; 4:2556-62. [PMID: 16791318 DOI: 10.1039/b604361e] [Citation(s) in RCA: 51] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Four different regioisomers of cationic bis-N,N-dimethylfulleropyrrolidinium salts have been prepared and evaluated as inhibitors of the enzymatic activity of acetylcholinesterase. These fullerene-based derivatives were found to be noncompetitive inhibitors of acetylthiocholine hydrolysis. Molecular modelling was used to describe the possible interactions between the fullerene cage and the amino acids surrounding the cavity of the enzyme. The cationic C(60) derivatives used in this study represent a new class of molecules potentially able to modulate the enzymatic activity of acetylcholinesterase.
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Affiliation(s)
- Giorgia Pastorin
- Institute of Molecular and Cellular Biology, UPR 9021 CNRS, Strasbourg, France
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Moravec J, Vyskocil F. Early postdenervation depolarization develops faster at endplates of hibernating golden hamsters where spontaneous quantal and non-quantal acetylcholine release is very small. Neurosci Res 2005; 51:25-9. [PMID: 15596237 DOI: 10.1016/j.neures.2004.09.003] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/28/2004] [Accepted: 09/10/2004] [Indexed: 10/26/2022]
Abstract
The hyperpolarization produced by the application of curare to the postsynaptic membrane of the diaphragm neuromuscular synapse (H-effect) is a measure of non-quantal release (NQR) of acetylcholine (ACh) from the motor nerve ending. In mouse diaphragm, H-effect was 9.3 mV, significantly lower in awake hamsters (7.1 mV) and very small (1.1 mV) in hibernating hamsters. Also, the initial resting membrane potential (RMP) after dissection was highest in mouse (81.5 mV, inside negative), significantly smaller in awake hamsters (77.9 mV) and lowest in hibernating hamsters (75.1 mV). The early postdenervation depolarization of muscle fiber RMP to about 66-68 mV developed with half-decay time (T1/2) of 120 min in mouse, more rapidly in active hamsters (T1/2=60 min) and even faster in hibernating hamsters (T1/2=25 min) muscles. This reciprocal correlation between the H-effect and the rate of early depolarization indicates that non-quantal release is important for maintaining the resting membrane potential [Vyskocil, F. 2003. Early postdenervation depolarization is controlled by acetylcholine and glutamate via nitric oxide regulation of the chloride transporter. Neurochem. Res. 28, 575-585]. The amplitude of H-effect in mouse and hamster was proportional to the spontaneous quantal release. The frequency of miniature endplate potentials was highest in mouse (1.6 s-1), much smaller in awake hamsters (0.51 s-1) and very small in hibernating hamsters (0.08 s-1). This is in accordance with the idea that non-quantal release depends on the number of vesicles fused with the presynaptic membrane during quantal release [Edwards et al., 1985; Ferguson, S.M., Savchenko, V., Apparsundaram, S., Zwick, M., Wright J., Heilman, C.J., Yi, H., Levey, A.I., Blakely R.D. Vesicular localization and activity-dependent trafficking of presynaptic choline transporters. J. Neurosci. 23 (2003) 9697-9709].
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Affiliation(s)
- Jan Moravec
- Department of Animal Physiology and Developmental Biology, Charles University, Vinicná 7, Prague-2, Czech Republic
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49
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Kiss G, Zádor E, Szalay J, Somogyi J, Vér A. Molecular forms of acetylcholinesterase in the rat extensor digitorum longus and soleus muscles regenerating from notexin-induced necrosis. J Muscle Res Cell Motil 2005; 25:509-14. [PMID: 15711881 DOI: 10.1007/s10974-004-2928-9] [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: 05/03/2004] [Accepted: 08/08/2004] [Indexed: 11/28/2022]
Abstract
The activity of acetylcholinesterase molecular forms were examined after separation on sucrose gradients during notexin-induced necrosis and the following regeneration in rat extensor digitorum longus (EDL) and soleus (SOL) muscles. All forms dropped rapidly in both muscles in the first few days after single notexin injection. After a delay small globular forms (G1+G2) started to regenerate from day 7 and larger forms (G4 and A12) from day 10 in EDL. The A8 form which cannot be detected in normal EDL was present between day 7 and day 28. In SOL the recovery of AChE forms begun already on day 3. The small globular forms displayed a more rapid increase between day 3 and day 7 then the other forms. In SOL we observed a temporary overshooting peak at day 7 in the activity of all molecular forms. Both muscles recovered their normal AChE pattern by that time when muscle fibres regained their normal diameter (day 28). Most of the events of regeneration of AChE forms resembled those of normal myogenesis.
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Affiliation(s)
- Gábor Kiss
- Department of Conservative Dentistry, Faculty of Dentistry, Semmelweis University, Budapest, Hungary
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50
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Tezer N. Ab initio molecular structure study of alkyl substitute analogues of Alzheimer drug phenserine: structure–activity relationships for acetyl- and butyrylcholinesterase inhibitory action. ACTA ACUST UNITED AC 2005. [DOI: 10.1016/j.theochem.2004.08.062] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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