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Terajima T, Ayabe C, Matsumoto Y, Uehara K, Horikoshi R, Suzuki T, Shimomura K, Tomizawa M. Potency and Target Surface Interaction of Diazinoyl Nicotinic Insecticides. JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY 2024; 72:12967-12974. [PMID: 38814790 DOI: 10.1021/acs.jafc.4c01499] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/01/2024]
Abstract
Structure-activity relationships of diazinoyl nicotinic insecticides (diazinoyl isomers and 5- or 6-substituted pyrazin-2-oyl analogues) are considered in terms of affinity to the insect nicotinic acetylcholine receptor (nAChR) and insecticidal activity against the imidacloprid-resistant brown planthopper. Among the test compounds, 3-(6-chloropyridin-3-ylmethyl)-2-(pyrazinoyl)iminothiazoline shows the highest potency in nAChR affinity and insecticidal activity. Aplysia californica acetylcholine binding protein (AChBP) mutants (Y55W + Q57R and Y55W + Q57T) are utilized to compare molecular recognition of nicotinic insecticides with diverse pharmacophores. N-nitro- or N-cyanoimine imidacloprid or acetamiprid, respectively, exhibits a high affinity to these AChBP mutants at a similar potency level. Intriguingly, the pyrazin-2-oyl analogue has a higher affinity to AChBP Y55W + Q57R than that to Y55W + Q57T, thereby indicating that pyrazine nitrogen atoms contact Arg57 guanidinium and Trp55 indole NH. Furthermore, nicotine prefers AChBP Y55W + Q57T over Y55W + Q57R, conceivably suggesting that the protonated nicotine is repulsed by Arg57 guanidinium, consistent with its inferior potency to insect nAChR.
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Affiliation(s)
- Takehito Terajima
- Department of Chemistry, Faculty of Life Sciences, Tokyo University of Agriculture, Setagaya, Tokyo 156-8502, Japan
| | - Chihiro Ayabe
- Department of Chemistry, Faculty of Life Sciences, Tokyo University of Agriculture, Setagaya, Tokyo 156-8502, Japan
| | - Yutsuki Matsumoto
- Department of Chemistry, Faculty of Life Sciences, Tokyo University of Agriculture, Setagaya, Tokyo 156-8502, Japan
| | - Kana Uehara
- Department of Chemistry, Faculty of Life Sciences, Tokyo University of Agriculture, Setagaya, Tokyo 156-8502, Japan
| | - Ryo Horikoshi
- Biological Solutions Research Center, Research and Development Division, Mitsui Chemicals Crop & Life Solutions, Inc., Mobara 297-0017, Chiba, Japan
| | - Tomonori Suzuki
- Department of Molecular Microbiology, Faculty of Life Sciences, Tokyo University of Agriculture, Setagaya, Tokyo 156-8502, Japan
| | - Kenji Shimomura
- Department of Chemistry, Faculty of Life Sciences, Tokyo University of Agriculture, Setagaya, Tokyo 156-8502, Japan
| | - Motohiro Tomizawa
- Department of Chemistry, Faculty of Life Sciences, Tokyo University of Agriculture, Setagaya, Tokyo 156-8502, Japan
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Taha M, Houchat JN, Taillebois E, Thany SH. The calcium-calmodulin-dependent protein kinase kinase inhibitor, STO-609, inhibits nicotine-induced currents and intracellular calcium increase in insect neurosecretory cells. J Neurochem 2024. [PMID: 38339787 DOI: 10.1111/jnc.16077] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/02/2023] [Revised: 01/24/2024] [Accepted: 01/25/2024] [Indexed: 02/12/2024]
Abstract
Insect neuronal nicotinic acetylcholine receptors (nAChRs) are transmembrane receptors that play a key role in the development and synaptic plasticity of both vertebrates and invertebrates and are considered to be major targets of neonicotinoid insecticides. We used dorsal unpaired median (DUM) neurons, which are insect neurosecretory cells, in order to explore the intracellular mechanisms leading to the regulation of insect neuronal nAChRs in more detail. Using whole-cell patch-clamp and fura-2AM calcium imaging techniques, we found that a novel CaMKK/AMPK pathway could be involved in the intracellular regulation of DUM neuron nAChRs. The CaMKK selective inhibitor, STO, reduced nicotinic current amplitudes, and strongly when co-applied with α-Bgt. Interestingly, intracellular application of the AMPK activator, A-76, prevented the reduction in nicotine-induced currents observed in the presence of the AMPK inhibitor, dorsomorphin. STO prevented the increase in intracellular calcium induced by nicotine, which was not dependent on α-Bgt. Currents induced by 1 mM LMA, a selective activator of nAChR2, were reduced under bath application of STO, and mecamylamine, which blocked nAChR2 subtype, inhibited the increase in intracellular calcium induced by LMA. These findings provide insight into potential complex mechanisms linked to the modulation of the DUM neuron nAChRs and CaMKK pathway.
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Affiliation(s)
- Maria Taha
- Laboratoire Physiologie, Ecologie et Environnement (P2E), USC-INRAE 1328, Université d'Orléans, Orléans, France
| | - Jean-Noël Houchat
- Laboratoire Physiologie, Ecologie et Environnement (P2E), USC-INRAE 1328, Université d'Orléans, Orléans, France
| | - Emiliane Taillebois
- Laboratoire Physiologie, Ecologie et Environnement (P2E), USC-INRAE 1328, Université d'Orléans, Orléans, France
| | - Steeve H Thany
- Laboratoire Physiologie, Ecologie et Environnement (P2E), USC-INRAE 1328, Université d'Orléans, Orléans, France
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Matsumoto Y, Matsumoto CS, Mizunami M. Critical roles of nicotinic acetylcholine receptors in olfactory memory formation and retrieval in crickets. Front Physiol 2024; 15:1345397. [PMID: 38405118 PMCID: PMC10884312 DOI: 10.3389/fphys.2024.1345397] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/27/2023] [Accepted: 01/29/2024] [Indexed: 02/27/2024] Open
Abstract
Acetylcholine (ACh) is a major excitatory neurotransmitter in the insect central nervous system, and insect neurons express several types of ACh receptors (AChRs). AChRs are classified into two subgroups, muscarinic AChRs and nicotinic AChRs (nAChRs). nAChRs are also divided into two subgroups by sensitivity to α-bungarotoxin (α-BGT). The cricket Gryllus bimaculatus is one of the useful insects for studying the molecular mechanisms in olfactory learning and memory. However, the roles of nAChRs in olfactory learning and memory of the cricket are still unknown. In the present study, to investigate whether nAChRs are involved in cricket olfactory learning and memory, we tested the effects of two different AChR antagonists on long-term memory (LTM) formation and retrieval in a behavioral assay. The two AChR antagonists that we used are mecamylamine (MEC), an α-BGT-insensitive nAChR antagonist, and methyllycaconitine (MLA), an α-BGT-sensitive nAChR antagonist. In crickets, multiple-trial olfactory conditioning induced 1-day memory (LTM), whereas single-trial olfactory conditioning induced 1-h memory (mid-term memory, MTM) but not 1-day memory. Crickets injected with MEC 20 min before the retention test at 1 day after the multiple-trial conditioning exhibited no memory retrieval. This indicates that α-BGT-insensitive nAChRs participate in memory retrieval. In addition, crickets injected with MLA before the multiple-trial conditioning exhibited MTM but not LTM, indicating that α-BGT-sensitive nAChRs participate in the formation of LTM. Moreover, injection of nicotine (an nAChR agonist) before the single-trial conditioning induced LTM. Finally, the nitric oxide (NO)-cGMP signaling pathway is known to participate in the formation of LTM in crickets, and we conducted co-injection experiments with an agonist or inhibitor of the nAChR and an activator or inhibitor of the NO-cGMP signaling pathway. The results suggest that nAChR works upstream of the NO-cGMP signaling system in the LTM formation process.
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Affiliation(s)
- Yukihisa Matsumoto
- Institute of Education, Liberal Arts and Sciences Division, Tokyo Medical and Dental University, Ichikawa, Chiba, Japan
| | | | - Makoto Mizunami
- Faculty of Science, Hokkaido University, Sapporo, Hokkaido, Japan
- Research Institute for Electronic Science, Hokkaido University, Sapporo, Hokkaido, Japan
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Taillebois E, Cartereau A, Thany SH. Effect of Acetamiprid, a Neonicotinoid Insecticide, on Locomotor Activity of the American Cockroach. INSECTS 2024; 15:54. [PMID: 38249060 PMCID: PMC10816188 DOI: 10.3390/insects15010054] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/05/2023] [Revised: 12/30/2023] [Accepted: 01/10/2024] [Indexed: 01/23/2024]
Abstract
Toxicological studies have shown that the American cockroach Periplaneta americana (Linnaeus) is a classical model for studying the mode of action of commonly used insecticides. In a previous study, we demonstrated that thiamethoxam and clothianidin decreased locomotor activity in an open-field-like apparatus. Here, we tested the effect of the neonicotinoid acetamiprid when applied orally, topically, or injected into the haemolymph. We found that acetamiprid was also able to impair locomotor activity in the open-field-like apparatus. When treated with acetamiprid, a strong alteration in locomotor activity was observed 1 h, 24 h, and 48 h after haemolymph and topical applications. Oral application induced an impairment of locomotor activity at 24 h and 48 h. A comparison of the present data with our previously published results showed that neonicotinoids were more active when injected into the haemolymph compared to oral and topical applications. These findings increased our understanding of the effect of neonicotinoid insecticides on insect locomotor activity, and demonstrated that the cyano-substituted neonicotinoid, acetamiprid, was able to alter cockroach locomotor activity.
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Affiliation(s)
| | | | - Steeve H. Thany
- Laboratory Physiology, Ecology and Environment (P2E), University of Orleans, USC-INRAE 1328, 1 rue de Chartres, 45067 Orleans, France; (E.T.); (A.C.)
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Guillem-Amat A, López-Errasquín E, García-Ricote I, Barbero JL, Sánchez L, Casas-Tintó S, Ortego F. Immunodetection of Truncated Forms of the α6 Subunit of the nAChR in the Brain of Spinosad Resistant Ceratitis capitata Phenotypes. INSECTS 2023; 14:857. [PMID: 37999056 PMCID: PMC10672392 DOI: 10.3390/insects14110857] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/10/2023] [Revised: 10/30/2023] [Accepted: 11/01/2023] [Indexed: 11/25/2023]
Abstract
The α6 subunit of the nicotinic acetylcholine receptor (nAChR) has been proposed as the target for spinosad in insects. Point mutations that result in premature stop codons in the α6 gene of Ceratitis capitata flies have been previously associated with spinosad resistance, but it is unknown if these transcripts are translated and if so, what is the location of the putative truncated proteins. In this work, we produced a specific antibody against C. capitata α6 (Ccα6) and validated it by ELISA, Western blotting and immunofluorescence assays in brain tissues. The antibody detects both wild-type and truncated forms of Ccα6 in vivo, and the protein is located in the cell membrane of the brain of wild-type spinosad sensitive flies. On the contrary, the shortened transcripts present in resistant flies generate putative truncated proteins that, for the most part, fail to reach their final destination in the membrane of the cells and remain in the cytoplasm. The differences observed in the locations of wild-type and truncated α6 proteins are proposed to determine the susceptibility or resistance to spinosad.
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Affiliation(s)
- Ana Guillem-Amat
- Centro de Investigaciones Biológicas Margaritas Salas, CSIC, 28040 Madrid, Spain (F.O.)
| | - Elena López-Errasquín
- Centro de Investigaciones Biológicas Margaritas Salas, CSIC, 28040 Madrid, Spain (F.O.)
| | | | - José Luis Barbero
- Centro de Investigaciones Biológicas Margaritas Salas, CSIC, 28040 Madrid, Spain (F.O.)
| | - Lucas Sánchez
- Centro de Investigaciones Biológicas Margaritas Salas, CSIC, 28040 Madrid, Spain (F.O.)
| | | | - Félix Ortego
- Centro de Investigaciones Biológicas Margaritas Salas, CSIC, 28040 Madrid, Spain (F.O.)
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Bloomquist JR, Coquerel QRR, Hulbert D, Norris ER. Neurophysiological action of centrally-acting spider toxin polypeptides derived from Hadronyche versuta and Tegenaria agrestis venoms. PESTICIDE BIOCHEMISTRY AND PHYSIOLOGY 2023; 192:105416. [PMID: 37105624 DOI: 10.1016/j.pestbp.2023.105416] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/07/2023] [Accepted: 03/29/2023] [Indexed: 06/19/2023]
Abstract
Established dogma concerning the action of insecticidal arthropod-derived peptides (e.g., scorpion toxins), was that they acted on the peripheral nervous system and were excluded from the central nervous system (CNS) by barrier systems. Initial evidence for a CNS-directed toxicological effect following parenteral administration was for a novel peptide from the Hobo spider, Tegeneria agrestis. This toxin was inactive on peripheral sensory and motor nerves, but had a potent excitatory effect on the CNS of larval Musca domestica. Recently, a commercialized formulation of GS-omega/kappa-Hxtx-Hv1a (HXTX), derived from the venom of the Australian blue mountain funnel web spider (Hadronyche versuta) was introduced for use in agriculture by Vestaron Corp. Its primary mode of action was found to be central neuroexcitation via positive allosteric modulation of nicotinic acetylcholine receptors (nAchR) of cockroach neurons. In the present study, this peptide showed hyperexcitation followed by a decrease in firing of the Drosophila melanogaster larval CNS that was prevented by co-exposure to 100 nM α-bungarotoxin (α-BGTX), a classical nAchR noncompetitive antagonist. This effect was mirrored in isobologram analysis, which showed clear antagonism between the two toxins when injected into adult houseflies. Interestingly, U1-agatoxin-Ta1b-QA derived from Tegeneria agrestis (VST-7304) had a similar biphasic action, but showed increased nerve discharge when co-exposed with 100 nM α-BGTX, and had additive effects when injected together with α-BGTX in isobologram analyses. Binary mixtures of HXTX or VST-7304 with 30 nM nicotine showed clear evidence of synergized nerve block, which was also observed for mixtures of HXTX and VST-7304. Taken together, these data suggest that HXTX and VST-7304 have somewhat different and complementary modes of action.
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Affiliation(s)
- J R Bloomquist
- Entomology & Nematology Department, Emerging Pathogens Institute, University of Florida, P.O. Box 100009, 2055 Mowry Road, Gainesville, FL 32610, USA.
| | - Q R R Coquerel
- Entomology & Nematology Department, Emerging Pathogens Institute, University of Florida, P.O. Box 100009, 2055 Mowry Road, Gainesville, FL 32610, USA.
| | - D Hulbert
- Vestaron Corp., 4717 Campus Dr., Kalamazoo, MI 49008, USA.
| | - E R Norris
- Entomology & Nematology Department, Emerging Pathogens Institute, University of Florida, P.O. Box 100009, 2055 Mowry Road, Gainesville, FL 32610, USA; USDA/ARS Center for Medical, Agricultural, and Veterinary Entomology, Gainesville, FL 32610, USA.
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Thany SH. Molecular Mechanism of Action of Neonicotinoid Insecticides. Int J Mol Sci 2023; 24:ijms24065484. [PMID: 36982557 PMCID: PMC10056306 DOI: 10.3390/ijms24065484] [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: 02/16/2023] [Revised: 03/03/2023] [Accepted: 03/07/2023] [Indexed: 03/16/2023] Open
Abstract
Since neonicotinoid insecticides were first introduced several years ago, most of them have been banned by the European Union due to their potentially adverse effects on humans and useful insects [...]
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Affiliation(s)
- Steeve H Thany
- Department of Biology and Biochemistry, Université d'Orléans, LBLGC USC-INRAE 1328, 1 rue de Chartres, 45067 Orléans, France
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Selvam B, Landagaray E, Cartereau A, Laurent AD, Graton J, Lebreton J, Thany SH, Mathé-Allainmat M, Le Questel JY. Identification of sulfonamide compounds active on the insect nervous system: Molecular modeling, synthesis and biological evaluation. Bioorg Med Chem Lett 2023; 80:129124. [PMID: 36610552 DOI: 10.1016/j.bmcl.2023.129124] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/02/2022] [Revised: 12/01/2022] [Accepted: 01/02/2023] [Indexed: 01/05/2023]
Abstract
Insect nicotinic acetylcholine receptors (nAChRs) are a recognized target for insecticide design. In this work, we have identified, from a structure-based approach using molecular modeling tools, ligands with potential selective activity for pests versus pollinators. A high-throughput virtual screening with the Openeye software was performed using a library from the ZINC database, thiacloprid being used as the target structure. The top sixteen molecules were then docked in α6 cockroach and honeybee homomeric nAChRs to check from a theoretical point of view relevant descriptors in favor of pest selectivity. Among the selected molecules, one original sulfonamide compound has afterward been synthesized, together with various analogs. Two compounds of this family have been shown to behave as activators of the cockroach cholinergic synaptic transmission.
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Affiliation(s)
- Balaji Selvam
- Nantes Université, CNRS, CEISAM, UMR 6230, F-44000 Nantes, France; Gossamer Bio, 3013 Science Park Road, Suite 200, San Diego, CA 92121, France
| | | | - Alison Cartereau
- Université d'Orléans, Laboratoire Biologie des Ligneux et des Grandes Cultures, USC INRAE 1328, Rue de Chartres, BP 6759, 45067 Orléans Cedex 2, France
| | - Adèle D Laurent
- Nantes Université, CNRS, CEISAM, UMR 6230, F-44000 Nantes, France
| | - Jérôme Graton
- Nantes Université, CNRS, CEISAM, UMR 6230, F-44000 Nantes, France
| | - Jacques Lebreton
- Nantes Université, CNRS, CEISAM, UMR 6230, F-44000 Nantes, France
| | - Steeve H Thany
- Université d'Orléans, Laboratoire Biologie des Ligneux et des Grandes Cultures, USC INRAE 1328, Rue de Chartres, BP 6759, 45067 Orléans Cedex 2, France
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Yuan GR, Chen ML, Peng ML, Lei W, Meng LW, Dou W, Wang JJ. Knockdown of a Nicotinic Acetylcholine Receptor Subunit Gene Bdorβ1 Decreases Susceptibility to Oxa-Bridged trans- instead of cis-Nitromethylene Neonicotinoid Insecticides in Bactrocera dorsalis. JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY 2022; 70:13554-13562. [PMID: 36224100 DOI: 10.1021/acs.jafc.2c04709] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/16/2023]
Abstract
Nicotinic acetylcholine receptors (nAChRs) are ligand-gated ion channels that mediate the fast action of acetylcholine in synaptic cholinergic transmissions. Insect nAChRs are the target of several classes of insecticides. Here, the full-length cDNA encoding a nAChR beta1 subunit (Bdorβ1) was identified and characterized from a destructive pest, Bactrocera dorsalis. The amino acid sequence of Bdorβ1 shows high identities to other insect nAChRs β1 subunits. Double injection of dsBdorβ1 reduced the expression of Bdorβ1 and in turn significantly decreased susceptibility to oxa-bridged trans- instead of cis-nitromethylene neonicotinoids. Our results support the involvement of Bdorβ1 in the susceptibility of B. dorsalis to oxa-bridged trans- instead of cis-nitromethylene neonicotinoids and imply that these two classes of neonicotinoids might be acting at different nAChR subtypes.
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Affiliation(s)
- Guo-Rui Yuan
- Academy of Agricultural Sciences, Southwest University, Chongqing 400716, China
- Key Laboratory of Entomology and Pest Control Engineering (Chongqing), College of Plant Protection, Southwest University, Chongqing 400716, China
| | - Meng-Ling Chen
- Academy of Agricultural Sciences, Southwest University, Chongqing 400716, China
- Key Laboratory of Entomology and Pest Control Engineering (Chongqing), College of Plant Protection, Southwest University, Chongqing 400716, China
| | - Meng-Lan Peng
- Academy of Agricultural Sciences, Southwest University, Chongqing 400716, China
- Key Laboratory of Entomology and Pest Control Engineering (Chongqing), College of Plant Protection, Southwest University, Chongqing 400716, China
| | - Wei Lei
- Key Laboratory of Entomology and Pest Control Engineering (Chongqing), College of Plant Protection, Southwest University, Chongqing 400716, China
| | - Li-Wei Meng
- Academy of Agricultural Sciences, Southwest University, Chongqing 400716, China
- Key Laboratory of Entomology and Pest Control Engineering (Chongqing), College of Plant Protection, Southwest University, Chongqing 400716, China
| | - Wei Dou
- Academy of Agricultural Sciences, Southwest University, Chongqing 400716, China
- Key Laboratory of Entomology and Pest Control Engineering (Chongqing), College of Plant Protection, Southwest University, Chongqing 400716, China
| | - Jin-Jun Wang
- Academy of Agricultural Sciences, Southwest University, Chongqing 400716, China
- Key Laboratory of Entomology and Pest Control Engineering (Chongqing), College of Plant Protection, Southwest University, Chongqing 400716, China
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Zhang YC, Pei XG, Yu ZT, Gao Y, Wang LX, Zhang N, Song XY, Wu SF, Gao CF. Effects of nicotinic acetylcholine receptor subunit deletion mutants on insecticide susceptibility and fitness in Drosophila melanogaster. PEST MANAGEMENT SCIENCE 2022; 78:3519-3527. [PMID: 35576366 DOI: 10.1002/ps.6992] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/06/2021] [Revised: 04/26/2022] [Accepted: 05/16/2022] [Indexed: 06/15/2023]
Abstract
BACKGROUND Nicotinic acetylcholine receptors (nAChRs) are major excitatory neurotransmitter receptors in insects and also the target site for many insecticides. Unfortunately, the effectiveness of these insecticides is diminishing as a consequence of the evolution of insecticide resistance. Further exploration of insecticide targets is important to sustainable pest management. RESULTS In order to validate the role of nAChR subunits in insecticide susceptibility and test whether the subunit's absence imposes the fitness cost on insects, we determined the susceptibility of eight nAChR subunit deletion mutants of Drosophila melanogaster to nine insecticides. These findings highlighted the specific resistance of the Dα6 deletion mutant to spinosyns. Although triflumezopyrim, dinotefuran and imidacloprid are competitive modulators of nAChRs, differences in susceptibility of the insect with different deletion mutants suggested that the target sites of these three insecticides do not overlap completely. Mutants showed decreased susceptibility to insecticides, accompanied by a reduction in fitness. The number of eggs produced by Dα1attP , Dα2attP , Dβ2attP and Dβ3attP females was significantly lesser than that of the vas-Cas9 strain as the control. In addition, adults of Dα2attP , Dα3attP and Dα7attP strains showed lower climbing performance. Meanwhile, males of Dα3attP , Dα5attP , Dβ2attP and Dβ3attP , and females of Dβ2attP showed significantly shorter longevity than those of the vas-Cas9 strain. CONCLUSION This study provides new insights into the interactions of different insecticides with different nAChRs subunit in D. melanogaster as a research model, it could help better understand such interaction in agricultural pests whose genetic manipulations for toxicological research are often challenging. © 2022 Society of Chemical Industry.
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Affiliation(s)
- Yan-Chao Zhang
- College of Plant Protection, Nanjing Agricultural University/State & Local Joint Engineering Research Center of Green Pesticide-Invention and Application, Nanjing, China
| | - Xin-Guo Pei
- College of Plant Protection, Nanjing Agricultural University/State & Local Joint Engineering Research Center of Green Pesticide-Invention and Application, Nanjing, China
| | - Zhi-Tao Yu
- College of Plant Protection, Nanjing Agricultural University/State & Local Joint Engineering Research Center of Green Pesticide-Invention and Application, Nanjing, China
| | - Yang Gao
- College of Plant Protection, Nanjing Agricultural University/State & Local Joint Engineering Research Center of Green Pesticide-Invention and Application, Nanjing, China
| | - Li-Xiang Wang
- College of Plant Protection, Nanjing Agricultural University/State & Local Joint Engineering Research Center of Green Pesticide-Invention and Application, Nanjing, China
| | - Ning Zhang
- College of Plant Protection, Nanjing Agricultural University/State & Local Joint Engineering Research Center of Green Pesticide-Invention and Application, Nanjing, China
| | - Xin-Yu Song
- College of Plant Protection, Nanjing Agricultural University/State & Local Joint Engineering Research Center of Green Pesticide-Invention and Application, Nanjing, China
| | - Shun-Fan Wu
- College of Plant Protection, Nanjing Agricultural University/State & Local Joint Engineering Research Center of Green Pesticide-Invention and Application, Nanjing, China
| | - Cong-Fen Gao
- College of Plant Protection, Nanjing Agricultural University/State & Local Joint Engineering Research Center of Green Pesticide-Invention and Application, Nanjing, China
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Rosenthal JS, Yuan Q. Constructing and Tuning Excitatory Cholinergic Synapses: The Multifaceted Functions of Nicotinic Acetylcholine Receptors in Drosophila Neural Development and Physiology. Front Cell Neurosci 2021; 15:720560. [PMID: 34650404 PMCID: PMC8505678 DOI: 10.3389/fncel.2021.720560] [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: 06/04/2021] [Accepted: 08/20/2021] [Indexed: 11/13/2022] Open
Abstract
Nicotinic acetylcholine receptors (nAchRs) are widely distributed within the nervous system across most animal species. Besides their well-established roles in mammalian neuromuscular junctions, studies using invertebrate models have also proven fruitful in revealing the function of nAchRs in the central nervous system. During the earlier years, both in vitro and animal studies had helped clarify the basic molecular features of the members of the Drosophila nAchR gene family and illustrated their utility as targets for insecticides. Later, increasingly sophisticated techniques have illuminated how nAchRs mediate excitatory neurotransmission in the Drosophila brain and play an integral part in neural development and synaptic plasticity, as well as cognitive processes such as learning and memory. This review is intended to provide an updated survey of Drosophila nAchR subunits, focusing on their molecular diversity and unique contributions to physiology and plasticity of the fly neural circuitry. We will also highlight promising new avenues for nAchR research that will likely contribute to better understanding of central cholinergic neurotransmission in both Drosophila and other organisms.
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Affiliation(s)
- Justin S Rosenthal
- National Institute of Neurological Disorders and Stroke, National Institutes of Health, Bethesda, MD, United States
| | - Quan Yuan
- National Institute of Neurological Disorders and Stroke, National Institutes of Health, Bethesda, MD, United States
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12
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Cartereau A, Taillebois E, Le Questel JY, Thany SH. Mode of Action of Neonicotinoid Insecticides Imidacloprid and Thiacloprid to the Cockroach Pameα7 Nicotinic Acetylcholine Receptor. Int J Mol Sci 2021; 22:9880. [PMID: 34576043 PMCID: PMC8471617 DOI: 10.3390/ijms22189880] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/04/2021] [Revised: 09/01/2021] [Accepted: 09/08/2021] [Indexed: 12/28/2022] Open
Abstract
The functional expression of the cockroach Pameα7 nicotinic acetylcholine receptor subunit has been previously studied, and was found to be able to form a homomeric receptor when expressed in Xenopus laevis oocytes. In this study, we found that the neonicotinoid insecticide imidacloprid is unable to activate the cockroach Pameα7 receptor, although thiacloprid induces low inward currents, suggesting that it is a partial agonist. In addition, the co-application or 5 min pretreatment with 10 µM imidacloprid increased nicotine current amplitudes, while the co-application or 5 min pretreatment with 10 µM thiacloprid decreased nicotine-evoked current amplitudes by 54% and 28%, respectively. This suggesting that these two representatives of neonicotinoid insecticides bind differently to the cockroach Pameα7 receptor. Interestingly, the docking models demonstrate that the orientation and interactions of the two insecticides in the cockroach Pameα7 nAChR binding pocket are very similar. Electrophysiological results have provided evidence to suggest that imidacloprid and thiacloprid could act as modulators of the cockroach Pameα7 receptors.
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Affiliation(s)
- Alison Cartereau
- Université d’Orléans, LBLGC USC INRAE 1328, 45067 Orléans, France; (A.C.); (E.T.)
| | - Emiliane Taillebois
- Université d’Orléans, LBLGC USC INRAE 1328, 45067 Orléans, France; (A.C.); (E.T.)
| | | | - Steeve H. Thany
- Université d’Orléans, LBLGC USC INRAE 1328, 45067 Orléans, France; (A.C.); (E.T.)
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Phayakkaphon A, Dathong P, Ransibrahmanakul N, Sarovath N, Samung Y, Sakulpanich A. Oral toxicity of various Stemona collinsiae crude extracts against nymph and adult stages of American cockroach, Periplaneta americana (Dictyoptera: Blattodea). Heliyon 2021; 7:e07970. [PMID: 34585003 PMCID: PMC8453207 DOI: 10.1016/j.heliyon.2021.e07970] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/11/2021] [Revised: 07/24/2021] [Accepted: 09/07/2021] [Indexed: 11/21/2022] Open
Abstract
Stemona collinsiae exhibits insecticidal resistance against various pests and insect vectors. However, insecticidal activity of S. collinsiae roots has not been tested for some insect vectors, including the American cockroach, Periplaneta americana. The synanthropic insect P. americana is a reservoir of pathogenic and non-pathogenic microorganisms and a cause of infectious diseases and cockroach allergy. This important vector transmits microorganisms to animals and humans to cause vector-borne diseases. This research involved detection of the nymphicidal and adulticidal activities of S. collinsiae root extracts against P. americana through oral administration. The effects of hexane, dichloromethane, ethanol, and water crude extracts were tested on final instar nymphs and adult P. americana. After P. americana ingested bait containing hexane and dichloromethane crude extracts, signs of toxicity occurred, such as hind leg shaking, whole-body tremor, immobility, abdomen swelling, and death. At 48 h, the nymphs and adult P. americana that ingested dichloromethane crude extract-containing bait showed corrected mortality of 65%-100% and 20%-100%, respectively. Whereas none of the nymphs and adult P. americana that ingested the water crude extract-containing bait died (0% corrected mortality). When we dissected alimentary canals of the dead P. americana that had ingested dichloromethane and hexane crude extract-containing baits, the foreguts were found to be swollen. TLC analysis showed the dichloromethane and hexane crude extracts contained the alkaloid didehydrostemofoline and unknown fluorescent substances. Phytochemicals from crude extracts were detected in extracts of dissected alimentary canals using thin-layer chromatography, and didehydrostemofoline alkaloid and unknown fluorescent substances were found in cockroaches that ingested dichloromethane- and hexane-containing baits. The cause of death of P. americana may be attributed to alkaloids and synergistic effects of other substances in S. collinsiae root extract. Mechanisms of action might include several pathways involved in nervous system function. Thus, dichloromethane and hexane crude extracts can be developed as alternative active ingredients in a natural insecticide for cockroach control.
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Affiliation(s)
- Anon Phayakkaphon
- Department of Medical Entomology, Faculty of Tropical Medicine, Mahidol University, Bangkok 10400, Thailand
| | - Preeyanate Dathong
- Department of Medical Entomology, Faculty of Tropical Medicine, Mahidol University, Bangkok 10400, Thailand
| | - Napasorn Ransibrahmanakul
- Division of Pharmaceutical Sciences, Faculty of Pharmacy, Thammasat University, Rangsit Campus, Pathum Thani 12120, Thailand
| | - Nontapat Sarovath
- Division of Pharmaceutical Sciences, Faculty of Pharmacy, Thammasat University, Rangsit Campus, Pathum Thani 12120, Thailand
| | - Yudthana Samung
- Department of Medical Entomology, Faculty of Tropical Medicine, Mahidol University, Bangkok 10400, Thailand
| | - Aurapa Sakulpanich
- Division of Pharmaceutical Sciences, Faculty of Pharmacy, Thammasat University, Rangsit Campus, Pathum Thani 12120, Thailand
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Christesen D, Yang YT, Chen W, Batterham P, Perry T. Loss of the Dβ1 nicotinic acetylcholine receptor subunit disrupts bursicon-driven wing expansion and diminishes adult viability in Drosophila melanogaster. Genetics 2021; 219:6320792. [PMID: 34849910 DOI: 10.1093/genetics/iyab112] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/14/2021] [Accepted: 07/03/2021] [Indexed: 01/15/2023] Open
Abstract
Cholinergic signaling dominates the insect central nervous system, contributing to numerous fundamental pathways and behavioral circuits. However, we are only just beginning to uncover the diverse roles different cholinergic receptors may play. Historically, insect nicotinic acetylcholine receptors have received attention due to several subunits being key insecticide targets. More recently, there has been a focus on teasing apart the roles of these receptors, and their constituent subunits, in native signaling pathways. In this study, we use CRISPR-Cas9 genome editing to generate germline and somatic deletions of the Dβ1 nicotinic acetylcholine receptor subunit and investigate the consequences of loss of function in Drosophila melanogaster. Severe impacts on movement, male courtship, longevity, and wing expansion were found. Loss of Dβ1 was also associated with a reduction in transcript levels for the wing expansion hormone bursicon. Neuron-specific somatic deletion of Dβ1 in bursicon-producing neurons (CCAP-GAL4) was sufficient to disrupt wing expansion. Furthermore, CCAP-GAL4-specific expression of Dβ1 in a germline deletion background was sufficient to rescue the wing phenotype, pinpointing CCAP neurons as the neuronal subset requiring Dβ1 for the wing expansion pathway. Dβ1 is a known target of multiple commercially important insecticides, and the fitness costs exposed here explain why field-isolated target-site resistance has only been reported for amino acid replacements and not loss of function. This work reveals the importance of Dβ1-containing nicotinic acetylcholine receptors in CCAP neurons for robust bursicon-driven wing expansion.
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Affiliation(s)
- Danielle Christesen
- School of Biosciences, Bio21 Molecular Science and Biotechnology Institute, The University of Melbourne, Parkville, VIC 3010, Australia
| | - Ying Ting Yang
- School of Biosciences, Bio21 Molecular Science and Biotechnology Institute, The University of Melbourne, Parkville, VIC 3010, Australia
| | - Wei Chen
- School of Biosciences, Bio21 Molecular Science and Biotechnology Institute, The University of Melbourne, Parkville, VIC 3010, Australia
| | - Philip Batterham
- School of Biosciences, Bio21 Molecular Science and Biotechnology Institute, The University of Melbourne, Parkville, VIC 3010, Australia
| | - Trent Perry
- School of Biosciences, Bio21 Molecular Science and Biotechnology Institute, The University of Melbourne, Parkville, VIC 3010, Australia
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Terajima T, Suzuki T, Horikoshi R, Doi S, Nakamura M, Kobayashi F, Durkin KA, Shimomura K, Nakamura S, Yamamoto K, Tomizawa M. Deciphering the Flupyrimin Binding Surface on the Insect Nicotinic Acetylcholine Receptor. JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY 2021; 69:9551-9556. [PMID: 34374535 DOI: 10.1021/acs.jafc.1c03241] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/13/2023]
Abstract
A novel insecticide flupyrimin (FLP) with a trifluoroacetyl pharmacophore acts as an antagonist at the insect nicotinic acetylcholine receptor (nAChR). This investigation examines a hypothesis that the FLP C(O)CF3 moiety is primarily recognized by the β subunit-face in the ligand-binding pocket (interface between α and β subunits) of the insect nAChR. Accordingly, we evaluate the atomic interaction between a fluorine atom of FLP and the partnering amino acid side chain on the β subunit employing a recombinant hybrid nAChR consisting of aphid Mpα2 and rat Rβ2 subunits (with a mutation at T77 on the Rβ2). The H-donating T77R, T77K, T77N, or T77Q nAChR enhances the FLP binding potency relative to that of the wild-type receptor, whereas the affinity of neonicotinoid imidaclprid (IMI) with a nitroguanidine pharmacophore remains unchanged. These results facilitate the establishment of the unique FLP molecular recognition at the Mpα2/Mpβ1 interface structural model, thereby underscoring a distinction in its binding mechanism from IMI.
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Affiliation(s)
- Takehito Terajima
- Department of Chemistry, Faculty of Life Sciences, Tokyo University of Agriculture, Setagaya, Tokyo 156-8502, Japan
| | - Tomonori Suzuki
- Department of Molecular Microbiology, Faculty of Life Sciences, Tokyo University of Agriculture, Setagaya, Tokyo 156-8502, Japan
| | - Ryo Horikoshi
- Agricultural and Veterinary Research Labs, Agricultural and Veterinary Division, Meiji Seika Pharma Co., Ltd., Yokohama, Kanagawa 222-8567, Japan
| | - Shohei Doi
- Department of Chemistry, Faculty of Life Sciences, Tokyo University of Agriculture, Setagaya, Tokyo 156-8502, Japan
| | - Mizuki Nakamura
- Department of Chemistry, Faculty of Life Sciences, Tokyo University of Agriculture, Setagaya, Tokyo 156-8502, Japan
| | - Fumika Kobayashi
- Department of Chemistry, Faculty of Life Sciences, Tokyo University of Agriculture, Setagaya, Tokyo 156-8502, Japan
| | - Kathleen A Durkin
- College of Chemistry, University of California, Berkeley, Berkeley, California 94720-1460, United States
| | - Kenji Shimomura
- Department of Chemistry, Faculty of Life Sciences, Tokyo University of Agriculture, Setagaya, Tokyo 156-8502, Japan
| | - Satoshi Nakamura
- Agricultural and Veterinary Research Labs, Agricultural and Veterinary Division, Meiji Seika Pharma Co., Ltd., Yokohama, Kanagawa 222-8567, Japan
| | - Kazumi Yamamoto
- Agricultural and Veterinary Research Labs, Agricultural and Veterinary Division, Meiji Seika Pharma Co., Ltd., Yokohama, Kanagawa 222-8567, Japan
| | - Motohiro Tomizawa
- Department of Chemistry, Faculty of Life Sciences, Tokyo University of Agriculture, Setagaya, Tokyo 156-8502, Japan
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Matsuda K. Robust functional expression of insect nicotinic acetylcholine receptors provides new insights into neonicotinoid actions and new opportunities for pest and vector control. PEST MANAGEMENT SCIENCE 2021; 77:3626-3630. [PMID: 33202087 DOI: 10.1002/ps.6182] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/14/2020] [Revised: 11/13/2020] [Accepted: 11/17/2020] [Indexed: 06/11/2023]
Abstract
Neonicotinoids are selective modulators of insect nicotinic acetylcholine receptors (nAChRs). These widely deployed insecticides interact with the orthosteric sites of nAChRs, not only to activate nAChRs on their own, but also to block the desensitizing component of nAChR responses. To date recombinant vertebrate or insect/vertebrate hybrid nAChRs have been deployed to understand the mechanism of selectivity and diversity of neonicotinoid actions as well as to show that both α/α and α/non-α interfaces are involved in the interactions with neonicotinoids. However, many of the fine details of insecticide interactions with sites on nAChRs remain to be resolved. The breakthrough of functional expression of insect nAChRs allows such questions to be addressed, not only for neonicotinoids but for other insecticides targeting insect nAChRs. © 2020 Society of Chemical Industry.
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Affiliation(s)
- Kazuhiko Matsuda
- Department of Applied Biological Chemistry, Faculty of Agriculture, Kindai University, Nara, 631-8505, Japan
- Agricultural Technology and Innovation Research Institute, Kindai University, Nara, 631-8505, Japan
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17
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Perrier S, Moreau E, Deshayes C, El-Adouzi M, Goven D, Chandre F, Lapied B. Compensatory mechanisms in resistant Anopheles gambiae AcerKis and KdrKis neurons modulate insecticide-based mosquito control. Commun Biol 2021; 4:665. [PMID: 34079061 PMCID: PMC8172894 DOI: 10.1038/s42003-021-02192-0] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/07/2021] [Accepted: 05/06/2021] [Indexed: 02/04/2023] Open
Abstract
In the malaria vector Anopheles gambiae, two point mutations in the acetylcholinesterase (ace-1R) and the sodium channel (kdrR) genes confer resistance to organophosphate/carbamate and pyrethroid insecticides, respectively. The mechanisms of compensation that recover the functional alterations associated with these mutations and their role in the modulation of insecticide efficacy are unknown. Using multidisciplinary approaches adapted to neurons isolated from resistant Anopheles gambiae AcerKis and KdrKis strains together with larval bioassays, we demonstrate that nAChRs, and the intracellular calcium concentration represent the key components of an adaptation strategy ensuring neuronal functions maintenance. In AcerKis neurons, the increased effect of acetylcholine related to the reduced acetylcholinesterase activity is compensated by expressing higher density of nAChRs permeable to calcium. In KdrKis neurons, changes in the biophysical properties of the L1014F mutant sodium channel, leading to enhance overlap between activation and inactivation relationships, diminish the resting membrane potential and reduce the fraction of calcium channels available involved in acetylcholine release. Together with the lower intracellular basal calcium concentration observed, these factors increase nAChRs sensitivity to maintain the effect of low concentration of acetylcholine. These results explain the opposite effects of the insecticide clothianidin observed in AcerKis and KdrKis neurons in vitro and in vivo.
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Affiliation(s)
| | | | | | | | | | - Fabrice Chandre
- MIVEGEC, UMR IRD 224-CNRS 5290-Université de Montpellier, 911 avenue Agropolis, Montpellier, Cedex 05, France
| | - Bruno Lapied
- Univ Angers, INRAE, SIFCIR, SFR QUASAV, Angers, France.
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18
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Jiang J, Huang LX, Chen F, Sheng CW, Huang QT, Han ZJ, Zhao CQ. Novel alternative splicing of GABA receptor RDL exon 9 from Laodelphax striatellus modulates agonist potency. INSECT SCIENCE 2021; 28:757-768. [PMID: 32293803 DOI: 10.1111/1744-7917.12789] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/19/2019] [Revised: 04/01/2020] [Accepted: 04/06/2020] [Indexed: 06/11/2023]
Abstract
The resistance to dieldrin gene (RDL) encodes the primary subunit of the insect ionotropic γ-aminobutyric acid (GABA) receptor (GABAR), which is the target of phenylpyrazole and isoxazoline insecticides. The splice variants in exons 3 and 6 of RDL, which have been widely explored in many insects, modulate the agonist potency of the homomeric RDL GABAR and potentially play an important role in the development of insects. In the present study, four splice variants of exon 9 were identified in RDL of the small brown planthopper, Laodelphax striatellus (LsRDL), resulting in LsRDL-9a, LsRDL-9a', LsRDL-9b, and LsRDL-9c. LsRDL-9a has one more amino acid (E, glutamic acid) compared with LsRDL-9a', and LsRDL-9b lacked two amino acids and had seven different amino acids compared with LsRDL-9c. Two-electrode voltage-clamp recording on LsRDLs expressed in Xenopus oocytes showed that alternative splicing of exon 9 has significant impact on LsRDL sensitivity to the agonists GABA and β-alanine, whereas no significant difference was observed in the potencies of the non-competitive antagonists (NCAs) ethiprole and fluralaner on the splice variants. Our results suggest that alternative splicing of RDL exon 9 broadens functional capabilities of the GABAR in L. striatellus by influencing the action of GABA.
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Affiliation(s)
- Jie Jiang
- Education Ministry Key Laboratory of Integrated Management of Crop Diseases and Pests, College of Plant Protection, Nanjing Agricultural University, Nanjing, China
| | - Li-Xin Huang
- Education Ministry Key Laboratory of Integrated Management of Crop Diseases and Pests, College of Plant Protection, Nanjing Agricultural University, Nanjing, China
| | - Feng Chen
- Education Ministry Key Laboratory of Integrated Management of Crop Diseases and Pests, College of Plant Protection, Nanjing Agricultural University, Nanjing, China
| | - Cheng-Wang Sheng
- Education Ministry Key Laboratory of Integrated Management of Crop Diseases and Pests, College of Plant Protection, Nanjing Agricultural University, Nanjing, China
- College of Plant Protection, Anhui Agricultural University, Hefei, China
| | - Qiu-Tang Huang
- Education Ministry Key Laboratory of Integrated Management of Crop Diseases and Pests, College of Plant Protection, Nanjing Agricultural University, Nanjing, China
| | - Zhao-Jun Han
- Education Ministry Key Laboratory of Integrated Management of Crop Diseases and Pests, College of Plant Protection, Nanjing Agricultural University, Nanjing, China
| | - Chun-Qing Zhao
- Education Ministry Key Laboratory of Integrated Management of Crop Diseases and Pests, College of Plant Protection, Nanjing Agricultural University, Nanjing, China
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Santalla M, Pagola L, Gómez I, Balcazar D, Valverde CA, Ferrero P. Smoking flies: testing the effect of tobacco cigarettes on heart function of Drosophila melanogaster. Biol Open 2021; 10:bio.055004. [PMID: 33431431 PMCID: PMC7903996 DOI: 10.1242/bio.055004] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
Studies about the relationship between substances consumed by humans and their impact on health, in animal models, have been a challenge due to differences between species in the animal kingdom. However, the homology of certain genes has allowed extrapolation of certain knowledge obtained in animals. Drosophila melanogaster, studied for decades, has been widely used as model for human diseases as well as to study responses associated with the consumption of several substances. In the present work we explore the impact of tobacco consumption on a model of 'smoking flies'. Throughout these experiments, we aim to provide information about the effects of tobacco consumption on cardiac physiology. We assessed intracellular calcium handling, a phenomenon underlying cardiac contraction and relaxation. Flies chronically exposed to tobacco smoke exhibited an increased heart rate and alterations in the dynamics of the transient increase of intracellular calcium in myocardial cells. These effects were also evident under acute exposure to nicotine of the heart, in a semi-intact preparation. Moreover, the alpha 1 and 7 subunits of the nicotinic receptors are involved in the heart response to tobacco and nicotine under chronic (in the intact fly) as well as acute exposure (in the semi-intact preparation). The present data elucidate the implication of the intracellular cardiac pathways affected by nicotine on the heart tissue. Based on the probed genetic and physiological similarity between the fly and human heart, cardiac effects exerted by tobacco smoke in Drosophila advances our understanding of the impact of it in the human heart. Additionally, it may also provide information on how nicotine-like substances, e.g. neonicotinoids used as insecticides, affect cardiac function.This article has an associated First Person interview with the first author of the paper.
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Affiliation(s)
- Manuela Santalla
- Departamento de Ciencias Básicas y Experimentales, UNNOBA, Monteagudo 2772, Pergamino B2700, Argentina.,Centro de Investigaciones Cardiovasculares 'Dr. Horacio E. Cingolani', CONICET, Facultad de Ciencias Médicas, Av 60 & 120. UNLP, La Plata B1900, Argentina
| | - Lucía Pagola
- Centro de Investigaciones Cardiovasculares 'Dr. Horacio E. Cingolani', CONICET, Facultad de Ciencias Médicas, Av 60 & 120. UNLP, La Plata B1900, Argentina
| | - Ivana Gómez
- Centro de Investigaciones Cardiovasculares 'Dr. Horacio E. Cingolani', CONICET, Facultad de Ciencias Médicas, Av 60 & 120. UNLP, La Plata B1900, Argentina
| | - Darío Balcazar
- Centro de Estudios Parasitológicos y de Vectores, UNLP-CONICET, Bv 120s/n, La Plata B1900, Argentina
| | - Carlos A Valverde
- Centro de Investigaciones Cardiovasculares 'Dr. Horacio E. Cingolani', CONICET, Facultad de Ciencias Médicas, Av 60 & 120. UNLP, La Plata B1900, Argentina
| | - Paola Ferrero
- Departamento de Ciencias Básicas y Experimentales, UNNOBA, Monteagudo 2772, Pergamino B2700, Argentina .,Centro de Investigaciones Cardiovasculares 'Dr. Horacio E. Cingolani', CONICET, Facultad de Ciencias Médicas, Av 60 & 120. UNLP, La Plata B1900, Argentina
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20
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Le Mauff A, Chouikh H, Cartereau A, Charvet CL, Neveu C, Rispe C, Plantard O, Taillebois E, Thany SH. Nicotinic acetylcholine receptors in the synganglion of the tick Ixodes ricinus: Functional characterization using membrane microtransplantation. INTERNATIONAL JOURNAL FOR PARASITOLOGY-DRUGS AND DRUG RESISTANCE 2020; 14:144-151. [PMID: 33120248 PMCID: PMC7591337 DOI: 10.1016/j.ijpddr.2020.10.005] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 05/15/2020] [Revised: 10/04/2020] [Accepted: 10/07/2020] [Indexed: 11/28/2022]
Abstract
Nicotinic acetylcholine receptors are an important class of excitatory receptors in the central nervous system of arthropods. In the ticks Ixodes ricinus, the functional and pharmacological properties of nicotinic receptors located in their neurons are still unknown. The objective of this study was to characterize the pharmacological properties of tick nicotinic receptors using membrane microtransplantation in Xenopus laevis oocytes and two-electrodes voltage clamp method. The membranes microtransplanted were extracted from the tick synganglion. We found that oocytes microtransplanted with tick synganglion membranes expressed nicotinic acetylcholine receptor subtypes which were activated by acetylcholine (1 mM) and nicotine (1 mM). Currents induced by pressure application of acetylcholine and nicotine were diminished by 10 nM α-bungarotoxin and methyllycaconitine, suggesting that they expressed two subtypes of nicotinic receptors, α-bungarotoxin-sensitive and -insensitive, respectively. In addition, we found that nicotine receptors expressed in the synganglion membranes were poorly sensitive to the neonicotinoid insecticides clothianidin (CLT), imidacloprid (IMI), acetamiprid (ACE) and thiamethoxam (TMX), in agreement with their lack of activity as acaricides. Interestingly, current amplitudes were strongly potentialized in the presence of 1 μM PNU-120596. CLT was more active as an agonist than IMI, TMX and ACE. Finally, we demonstrated that microtransplantation of purified membrane from the tick synganglion can be a valuable tool for the development and screening of compounds targeting tick nicotinic acetylcholine receptor subtypes.
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Affiliation(s)
- Anaïs Le Mauff
- LBLGC USC INRAE 1328, Université d'Orléans, 1 rue de Chartres, 45067, Orléans, France
| | - Hamza Chouikh
- LBLGC USC INRAE 1328, Université d'Orléans, 1 rue de Chartres, 45067, Orléans, France
| | - Alison Cartereau
- LBLGC USC INRAE 1328, Université d'Orléans, 1 rue de Chartres, 45067, Orléans, France
| | | | | | | | | | - Emiliane Taillebois
- LBLGC USC INRAE 1328, Université d'Orléans, 1 rue de Chartres, 45067, Orléans, France
| | - Steeve H Thany
- LBLGC USC INRAE 1328, Université d'Orléans, 1 rue de Chartres, 45067, Orléans, France.
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21
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Hasan F, Mahboob S, Al-Ghanim KA, Al-Misned F, Dhillon MK, Manzoor U. Ecotoxicity of neonicotinoids and diamides on population growth performance of Zygogramma bicolorata (Coleoptera: Chrysomelidae). ECOTOXICOLOGY AND ENVIRONMENTAL SAFETY 2020; 203:110998. [PMID: 32778532 DOI: 10.1016/j.ecoenv.2020.110998] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/11/2020] [Revised: 07/03/2020] [Accepted: 07/06/2020] [Indexed: 06/11/2023]
Abstract
Relative ecotoxicity of approved neonicotinoids (i.e. imidacloprid, clothianidin, acetamiprid, thiacloprid, thiamethoxam and dinotefuran) and diamides (i.e. chlorantraniliprole, cyantraniliprole and flubendiamide) was examined on population growth parameters of Zygogramma bicolorata Pallister on parthenium under laboratory conditions at 27 ± 1 °C, 65 ± 5% relative humidity and 10 L : 14D photoperiod. The dose of all tested insecticides in the bioassay procedure was within a minimum range of their recommended field rate. In acute toxicity trial, imidacloprid caused highest rate of mortality in treated adults of Z. bicolorata, however, it was lowest in flubendiamide treatment followed by cyantraniliprole and chlorantraniliprole. Further, based on toxicity coefficient (E) value in acute toxicity trial, all were classified as harmful (H) and diamides were classified as moderately harmful (MH) as per IOBC classification. Moreover, chronic toxicity trials were carried out through life table response experiments (LTREs) in the F1 progeny of acute toxicity experienced group. Prolonged development with the highest mortality was evident in as compared to diamides. Furthermore, population growth parameters i.e. potential fecundity (Pf), natality rate (mx), intrinsic rate of increase (rm), net reproductive rate (R0) and finite rate of increase (λ) was greatly reduced in Z. bicolorata treated with neonicotinoids as compared with diamides. However, mean generation time (Tc), corrected generation time (τ) and the doubling time (DT) was prolonged in neonicotinoids followed by diamides. Furthermore, proportion of females was greatly reduced (0.43-0.48 females) in neonicotinoids as comparison to diamides (0.53-0.55 females) and control (0.67 females). On the basis of ecotoxicity trials, the tested neonicotinoids were highly toxic to Z. bicolorata than diamides. Therefore, diamide insecticides could be used with Z. bicolorata, however, for validation experimentation need to be done under natural field conditions.
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Affiliation(s)
- Fazil Hasan
- Department of Plant Protection, Faculty of Agricultural Sciences, Aligarh Muslim University, Aligarh, 202002, India; Division of Entomology, ICAR-Indian Agricultural Research Institute, New Delhi, 110012, India.
| | - Shahid Mahboob
- Department of Zoology, College of Science, King Saud University, Riyadh, 11451, Saudi Arabia
| | - Khalid A Al-Ghanim
- Department of Zoology, College of Science, King Saud University, Riyadh, 11451, Saudi Arabia
| | - Fahad Al-Misned
- Department of Zoology, College of Science, King Saud University, Riyadh, 11451, Saudi Arabia
| | - Mukesh K Dhillon
- Division of Entomology, ICAR-Indian Agricultural Research Institute, New Delhi, 110012, India
| | - Uzma Manzoor
- School of Agricultural Sciences, Sharda University, GN, Delhi, India
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Wang J, Ma H, Zuo Y, Yang Y, Wu Y. CRISPR-mediated gene knockout reveals nicotinic acetylcholine receptor (nAChR) subunit α6 as a target of spinosyns in Helicoverpa armigera. PEST MANAGEMENT SCIENCE 2020; 76:2925-2931. [PMID: 32384223 DOI: 10.1002/ps.5889] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/23/2020] [Revised: 04/25/2020] [Accepted: 05/08/2020] [Indexed: 06/11/2023]
Abstract
BACKGROUND The spinosyn insecticides (spinosad and spinetoram) have been intensively used to control a wide range of agricultural pests. However, resistance to spinosyns has evolved in several agricultural pests. Disruption of the nicotinic acetylcholine receptor subunit α6 (nAChRα6) has been associated with high levels of resistance to spinosyns in both field and laboratory-selected strains of several insect pests. Among the 12 nAChR subunits of Helicoverpa armigera, Haα6 has the closest sequence similarity (66.02%) to Haα7. Here we used CRISPR-mediated knockouts to evaluate the role of two nAChR subunits (Haα6 and Haα7) of H. armigera in toxicity of spinosyns. RESULTS Individual knockouts of Haα6 and Haα7 were created utilizing CRISPR/Cas9 system in H. armigera. The Haα6 knockout (Haα6-KO) strain exhibited high levels of resistance to spinosad (531-fold) and spinetoram (1105-fold) compared with the wild-type parent SCD strain, whereas the Haα7 knockout (Haα7-KO) strain showed no significant susceptibility changes to both spinosyns. Genetic analyses demonstrated that resistance to spinosad conferred by knockout of Haα6 was autosomal, incompletely recessive and tightly linked to the disruption mutation of Haα6. Both Haα6-KO and Haα7-KO strains had no significant effects on susceptibility to other four insecticides including emamectin benzoate, beta-cypermethrin, chlorantraniliprole and indoxacarb. CONCLUSION Our results provide in vivo functional evidence for Haα6 as a target of spinosyns in H. armigera, and little or no role of Haα7 in mediating toxicity of spinosyns. The results are valuable to the development of resistance monitoring and management methods for spinosyn resistance in H. armigera. © 2020 Society of Chemical Industry.
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Affiliation(s)
- Jing Wang
- College of Plant Protection, Nanjing Agricultural University, Nanjing, China
| | - Huanhuan Ma
- College of Plant Protection, Nanjing Agricultural University, Nanjing, China
| | - Yayun Zuo
- College of Plant Protection, Nanjing Agricultural University, Nanjing, China
| | - Yihua Yang
- College of Plant Protection, Nanjing Agricultural University, Nanjing, China
| | - Yidong Wu
- College of Plant Protection, Nanjing Agricultural University, Nanjing, China
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Cartereau A, Taillebois E, Selvam B, Martin C, Graton J, Le Questel JY, Thany SH. Cloning and Expression of Cockroach α7 Nicotinic Acetylcholine Receptor Subunit. Front Physiol 2020; 11:418. [PMID: 32457646 PMCID: PMC7221154 DOI: 10.3389/fphys.2020.00418] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/23/2019] [Accepted: 04/07/2020] [Indexed: 11/13/2022] Open
Abstract
Understanding insect nicotinic acetylcholine receptor (nAChR) subtypes is of major interest because they are the main target of several insecticides. In this study, we have cloned a cockroach Pameα7 subunit that encodes a 518 amino acid protein with futures typical of nAChR subunit, and sequence homology to α7 subunit. Pameα7 is differently expressed in the cockroach nervous system, in particular in the antennal lobes, optical lobes and the mushroom bodies where specific expression was found in the non-compact Kenyon cells. In addition, we found that cockroach Pameα7 subunits expressed in Xenopus laevis oocytes can assemble to form homomeric receptors. Electrophysiological recordings using the two-electrode voltage clamp method demonstrated that nicotine induced an I max current of -92 ± 27 nA at 1 mM. Despite that currents are low with the endogenous ligand, ACh, this study provides information on the first expression of cockroach α7 homomeric receptor.
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Affiliation(s)
- Alison Cartereau
- LBLGC, UPRES EA 1207-USC INRA 1328, Université d’Orléans, Orléans, France
| | | | - Balaji Selvam
- Roger Adams Laboratory, University of Illinois at Urbana-Champaign, Urbana, IL, United States
| | - Carine Martin
- LBLGC, UPRES EA 1207-USC INRA 1328, Université d’Orléans, Orléans, France
| | - Jérôme Graton
- CEISAM-UMR CNRS 6230, Faculté des Sciences et des Techniques, Université de Nantes, Nantes, France
| | - Jean-Yves Le Questel
- CEISAM-UMR CNRS 6230, Faculté des Sciences et des Techniques, Université de Nantes, Nantes, France
| | - Steeve H. Thany
- LBLGC, UPRES EA 1207-USC INRA 1328, Université d’Orléans, Orléans, France
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Wang X, Ma Y, Wang F, Yang Y, Wu S, Wu Y. Disruption of nicotinic acetylcholine receptor α6 mediated by CRISPR/Cas9 confers resistance to spinosyns in Plutella xylostella. PEST MANAGEMENT SCIENCE 2020; 76:1618-1625. [PMID: 31756263 DOI: 10.1002/ps.5689] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/15/2019] [Revised: 10/22/2019] [Accepted: 11/12/2019] [Indexed: 06/10/2023]
Abstract
BACKGROUND The clustered regularly interspaced short palindromic repeats (CRISPR)/Cas9 system provides some advantages over other reverse genetic techniques to investigate the causal relationship between insecticide resistance phenotype and candidate gene. Several studies published to date point to the nicotinic acetylcholine receptor (nAChR) α6 subunit strongly associated with spinosyns resistance in insects, including Plutella xylostella. However, reverse genetic verification of the P. xylostella nAChRα6 has not yet been achieved via an in vivo approach. RESULTS Here, we successfully constructed a homozygous strain (Pxα6-KO) with a 2-nt deletion mutation of nAChRα6 by CRISPR/Cas9 coupled with non-homologous end joining approach in P. xylostella. The manipulated mutation results in a frame shift in the open reading frame of transcripts, which produces a predicted protein truncated in the TM3-TM4 loop region. When compared to the background strain IPP-S, the knockout strain Pxα6-KO exhibited 229- and 1462-fold resistance to spinosad and spinetoram, respectively, but no or limited (resistance ratios <3-fold) effects on the toxicities of imidacloprid, abamectin, β-cypermethrin, indoxacarb, metaflumizone and chlorantraniliprole. Furthermore, the mode of inheritance of the acquired spinetoram resistance was autosomal recessive and significantly linked with the 2-nt deletion mutation of nAChRα6 in the Pxα6-KO strain. CONCLUSION In vivo functional investigation demonstrates the causality of the Pxα6 truncating mutation with high levels of resistance to spinosyns in P. xylostella. Our results suggest the Pxα6-KO strain underlies an autosomal, recessive mode of inheritance for spinetoram resistance, and reinforces the association of this gene to the mode of action of spinosyns. © 2019 Society of Chemical Industry.
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Affiliation(s)
- Xingliang Wang
- College of Plant Protection, Nanjing Agricultural University, Nanjing, China
| | - Yiming Ma
- College of Plant Protection, Nanjing Agricultural University, Nanjing, China
| | - Falong Wang
- College of Plant Protection, Nanjing Agricultural University, Nanjing, China
| | - Yihua Yang
- College of Plant Protection, Nanjing Agricultural University, Nanjing, China
| | - Shuwen Wu
- College of Plant Protection, Nanjing Agricultural University, Nanjing, China
| | - Yidong Wu
- College of Plant Protection, Nanjing Agricultural University, Nanjing, China
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Cabirol A, Haase A. The Neurophysiological Bases of the Impact of Neonicotinoid Pesticides on the Behaviour of Honeybees. INSECTS 2019; 10:insects10100344. [PMID: 31614974 PMCID: PMC6835655 DOI: 10.3390/insects10100344] [Citation(s) in RCA: 23] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 09/06/2019] [Revised: 10/04/2019] [Accepted: 10/06/2019] [Indexed: 12/16/2022]
Abstract
Acetylcholine is the main excitatory neurotransmitter in the honeybee brain and controls a wide range of behaviours that ensure the survival of the individuals and of the entire colony. Neonicotinoid pesticides target this neurotransmission pathway and can thereby affect the behaviours under its control, even at doses far below the toxicity limit. These sublethal effects of neonicotinoids on honeybee behaviours were suggested to be partly responsible for the decline in honeybee populations. However, the neural mechanisms by which neonicotinoids influence single behaviours are still unclear. This is mainly due to the heterogeneity of the exposure pathways, doses and durations between studies. Here, we provide a review of the state of the science in this field and highlight knowledge gaps that need to be closed. We describe the agonistic effects of neonicotinoids on neurons expressing the different nicotinic acetylcholine receptors and the resulting brain structural and functional changes, which are likely responsible for the behavioural alterations reported in bees exposed to neonicotinoids.
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Affiliation(s)
- Amélie Cabirol
- Center for Mind/Brain Sciences (CIMeC), University of Trento, piazza Manifattura 1, 38068 Rovereto, Italy.
| | - Albrecht Haase
- Center for Mind/Brain Sciences (CIMeC), University of Trento, piazza Manifattura 1, 38068 Rovereto, Italy.
- Department of Physics, University of Trento, via Sommarive 14, 38123 Povo, Italy.
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Tian J, Zhang Q, An X, Liu H, Liu Y, Liu H. Molecular Dynamics Simulations Study on the Resistant Mechanism of Insects to Imidacloprid due to Y151-S and R81T Mutations in nAChRs. Mol Inform 2019; 38:e1800125. [PMID: 31294911 DOI: 10.1002/minf.201800125] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/27/2018] [Indexed: 12/15/2022]
Abstract
Imidacloprid (IMI) is the first widely used neonicotinoid insecticide due to its high insecticidal activity and low toxicity. However, as its extensive use in crop protection, many insects are resistant to IMI. One of the main resistance mechanisms of insects to IMI is Y151-S and R81T mutations in nicotinic acetylcholine receptor (nAChR). However, how these two mutations affect the interaction of IMI with nAChR is unknown. Here, to uncover the resistant mechanism of nAChR to IMI due to Y151-S and R81T mutations, molecular dynamics simulations and molecular mechanics/generalized Born surface area (MM-GBSA) calculation, residue interaction network (RIN) analysis were performed. Due that the structure of nAChR is still unkonwn, the crystal structure of lymnaea stagnalis acetylcholine binding protein (Ls-AChBP) was used here to simulate nAChR. Y151 and R81 in nAChR correspond to H145 and Q55 in Ls-AChBP, respectively. The calculated binding free energy indicated that two mutations reduced the binding ability of IMI with Ls-AChBP. Q55T mutation reduced the contribution of several key residues, such as W53, T55, Y113, T144 and C187. As for H145-S mutation, the contribution of W53, Q55 and Y113 residues also decreased. RIN analysis showed that two mutants changed the binding pocket by changing the conformation of residues that interact directly with the mutated residues. The obtained resistance mechanism of IMI will be helpful for the design of potent insecticides.
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Affiliation(s)
- Jiaqi Tian
- School of Pharmacy, Lanzhou University, Lanzhou, 730000, China
| | - Qianqian Zhang
- School of Pharmacy, Lanzhou University, Lanzhou, 730000, China
| | - Xiaoli An
- State Key Laboratory of Applied Organic Chemistry and Department of Chemistry, Lanzhou University, Lanzhou, 730000, China
| | - Hongli Liu
- School of Pharmacy, Lanzhou University, Lanzhou, 730000, China
| | - Yingqian Liu
- School of Pharmacy, Lanzhou University, Lanzhou, 730000, China
| | - Huanxiang Liu
- School of Pharmacy, Lanzhou University, Lanzhou, 730000, China
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Parkinson RH, Gray JR. Neural conduction, visual motion detection, and insect flight behaviour are disrupted by low doses of imidacloprid and its metabolites. Neurotoxicology 2019; 72:107-113. [PMID: 30790592 DOI: 10.1016/j.neuro.2019.02.012] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/25/2018] [Revised: 01/14/2019] [Accepted: 02/16/2019] [Indexed: 01/06/2023]
Abstract
While neonicotinoid insecticides impair visually guided behaviours, the effects of their metabolites are unknown and measurements of environmental concentrations of neonicotinoids, typically lower than those required to elicit toxic effects, tend to exclude metabolites. Here we examined the contributions of imidacloprid and two of its metabolites, imidacloprid-olefin and 5-hydroxy-imidacloprid, on neural conduction velocity, visual motion detection and flight in the locust (Locusta migratoria) using a combination of electrophysiological and behavioural assays. We show reduced visual motion detection and impaired flight behaviour following treatment of metabolite concentrations equal to sublethal doses of the parent compound. Additionally, we show for the first time that imidacloprid and its metabolites result in a decrease in conduction velocity along an unmyelinated axon. We suggest that secondary effects of the insecticide on the biophysical properties of the axon may result in decreased neural conduction. As these metabolites display neurotoxicity similar to the parent compound they should be considered when quantifying environmental concentrations.
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Affiliation(s)
| | - John R Gray
- Department of Biology, University of Saskatchewan, Canada.
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28
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Ge J, Xiao Y, Chai Y, Yan H, Wu R, Xin X, Wang D, Yu X. Sub-lethal effects of six neonicotinoids on avoidance behavior and reproduction of earthworms (Eisenia fetida). ECOTOXICOLOGY AND ENVIRONMENTAL SAFETY 2018; 162:423-429. [PMID: 30015188 DOI: 10.1016/j.ecoenv.2018.06.064] [Citation(s) in RCA: 31] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/10/2018] [Revised: 06/20/2018] [Accepted: 06/20/2018] [Indexed: 06/08/2023]
Abstract
Avoidance behavior of earthworms (Eisenia fetida) against six neonicotinoids (NEOs) (acetamiprid, dinotefuram, clothianidin, thiacloprid, nitenpyram, imidacloprid) was studied following the protocol of ISO. The results showed obvious avoidance behavior of E. fetida against the tested insecticides, and the medium effective concentration for avoidance behavior (EC50) of the six pesticides was 0.14, 0.55, 0.91, 7.87, 1.32 and 0.77 mg/kg, respectively. Compared to the acute toxicity, avoidance behavior was more sensitive as an indicator of soil contamination with NEOs. Chronic toxicity of above six NEOs to E. fetida was also evaluated; cocoon production, hatchability, cocoon weight and adult weight were all affected in the test. Cocoon production and hatchability were more sensitive than cocoon weight and adult weight. The reproduction of earthworms were significantly reduced with a 56 d half-maximal effective hatchability concentration (EC50) of 0.37, 0.74, 1.30, 3.57, 1.20 and 0.70 mg/kg (acetamiprid, dinotefuram, clothianidin, thiacloprid, nitenpyram, imidacloprid), respectively. Most of the tested NEOs were highly toxic to E. fetida. Avoidance behavior and reproduction damage of E. fetida was observed at very low concentrations. The existing levels of pollution with NEOs in soil frequently exceed the lowest observed adverse effect concentrations, which are likely to have negative biological and ecological impacts on earthworms.
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Affiliation(s)
- Jing Ge
- Key Laboratory of Food Quality and Safety of Jiangsu Province-State Key Laboratory Breeding Base/Key Laboratory of Control Technology and Standard for Agro-product Safety and Quality, Ministry of Agriculture, P.R. China, Nanjing 210014, China; Institute of Food Quality and Safety, Jiangsu Academy of Agricultural Sciences, 50 Zhongling Street, Nanjing 210014, China
| | - Yuanzhuo Xiao
- Institute of Food Quality and Safety, Jiangsu Academy of Agricultural Sciences, 50 Zhongling Street, Nanjing 210014, China
| | - Yangyang Chai
- Institute of Food Quality and Safety, Jiangsu Academy of Agricultural Sciences, 50 Zhongling Street, Nanjing 210014, China
| | - Haijuan Yan
- Institute of Food Quality and Safety, Jiangsu Academy of Agricultural Sciences, 50 Zhongling Street, Nanjing 210014, China
| | - Ruohan Wu
- Institute of Food Quality and Safety, Jiangsu Academy of Agricultural Sciences, 50 Zhongling Street, Nanjing 210014, China
| | - Xing Xin
- Institute of Food Quality and Safety, Jiangsu Academy of Agricultural Sciences, 50 Zhongling Street, Nanjing 210014, China
| | - Donglan Wang
- Institute of Food Quality and Safety, Jiangsu Academy of Agricultural Sciences, 50 Zhongling Street, Nanjing 210014, China
| | - Xiangyang Yu
- Key Laboratory of Food Quality and Safety of Jiangsu Province-State Key Laboratory Breeding Base/Key Laboratory of Control Technology and Standard for Agro-product Safety and Quality, Ministry of Agriculture, P.R. China, Nanjing 210014, China; Institute of Food Quality and Safety, Jiangsu Academy of Agricultural Sciences, 50 Zhongling Street, Nanjing 210014, China.
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29
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Taillebois E, Cartereau A, Jones AK, Thany SH. Neonicotinoid insecticides mode of action on insect nicotinic acetylcholine receptors using binding studies. PESTICIDE BIOCHEMISTRY AND PHYSIOLOGY 2018; 151:59-66. [PMID: 30704714 DOI: 10.1016/j.pestbp.2018.04.007] [Citation(s) in RCA: 49] [Impact Index Per Article: 8.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/24/2017] [Revised: 04/14/2018] [Accepted: 04/17/2018] [Indexed: 06/09/2023]
Abstract
Nicotinic acetylcholine receptors (nAChRs) are the main target of neonicotinoid insecticides, which are widely used in crop protection against insect pests. Electrophysiological and molecular approaches have demonstrated the presence of several nAChR subtypes with different affinities for neonicotinoid insecticides. However, the precise mode of action of neonicotinoids on insect nAChRs remains to be elucidated. Radioligand binding studies with [3H]-α-bungarotoxin and [3H]-imidacloprid have proved instructive in understanding ligand binding interactions between insect nAChRs and neonicotinoid insecticides. The precise binding site interactions have been established using membranes from whole body and specific tissues. In this review, we discuss findings concerning the number of nAChR binding sites against neonicotinoid insecticides from radioligand binding studies on native tissues. We summarize the data available in the literature and compare the binding properties of the most commonly used neonicotinoid insecticides in several insect species. Finally, we demonstrate that neonicotinoid-nAChR binding sites are also linked to biological samples used and insect species.
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Affiliation(s)
- Emiliane Taillebois
- Université François Rabelais de Tours, Laboratoire Nutrition, Croissance et Cancer, INSERM 1069, 37032 Tours, France
| | - Alison Cartereau
- Université d'Orléans, LBLGC USC INRA 1328, 1 rue de Chartres, 45067 Orléans, France
| | - Andrew K Jones
- Department of Biological and Medical Sciences, Faculty of Health and Life Sciences, Oxford Brookes University, Oxford OX3 0BP, UK
| | - Steeve H Thany
- Université d'Orléans, LBLGC USC INRA 1328, 1 rue de Chartres, 45067 Orléans, France.
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Baldissera MD, Souza CF, Seben D, Sippert LR, Salbego J, Marchesan E, Zanella R, Baldisserotto B, Golombieski JI. Gill bioenergetics dysfunction and oxidative damage induced by thiamethoxam exposure as relevant toxicological mechanisms in freshwater silver catfish Rhamdia quelen. THE SCIENCE OF THE TOTAL ENVIRONMENT 2018; 636:420-426. [PMID: 29709859 DOI: 10.1016/j.scitotenv.2018.04.292] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/14/2018] [Revised: 04/16/2018] [Accepted: 04/22/2018] [Indexed: 06/08/2023]
Abstract
Thiamethoxam is a neonicotinoid pesticide utilized on a worldwide scale, it has been reported in freshwater ecosystems, and detected in fishery products. Nevertheless, there is a lack of information about thiamethoxam sublethal effects on the gills of freshwater fish, principally linked to energetic metabolism. In this context, creatine kinase (CK) is an enzyme of the phosphoryl transfer network that provides a temporal and spatial energy buffer to maintain cellular energy homeostasis in tissues with high energy requirements, such as gills. Based on this evidence, the aim of this study was to evaluate whether exposure to thiamethoxam impairs the cytosolic and mitochondrial CK activities in gills of Rhamdia quelen, and the involvement of oxidative stress in the energetic imbalance. Branchial CK (cytosolic and mitochondrial) activity and sodium‑potassium pump (Na+, K+-ATPase) were inhibited, and adenosine triphosphate (ATP) levels decreased after 96 h exposure to 1.125 and 3.75 μg/L thiamethoxam compared to the control group. Moreover, levels of branchial thiobarbituric acid reactive substances (TBARS) and protein carbonylation increased at 3.75 μg/L thiamethoxam after 96 h of exposure compared to the control group, while the non-protein thiol (NPSH) content did not differ between groups. It is important to emphasize that all evaluated parameters did not recover after 48 h in clean water. To summarize, the data presented here clearly demonstrated that thiamethoxan exposure severely impairs cytosolic and mitochondrial CK activities, a key enzyme for gill energy buffering to maintain cellular energy homeostasis, and this effect appears to be mediated by oxidation of lipid and protein molecules, which consequently thereby induces oxidative stress.
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Affiliation(s)
- Matheus D Baldissera
- Department of Microbiology and Parasitology, Universidade Federal de Santa Maria, Santa Maria, RS, Brazil.
| | - Carine F Souza
- Department of Physiology and Pharmacology, Universidade Federal de Santa Maria, Santa Maria, RS, Brazil
| | - Débora Seben
- Department of Environmental Engineering and Technology, Universidade Federal de Santa Maria, Santa Maria, RS, Brazil
| | - Letícia R Sippert
- Department of Environmental Engineering and Technology, Universidade Federal de Santa Maria, Santa Maria, RS, Brazil
| | - Joseania Salbego
- Department of Physiology and Pharmacology, Universidade Federal de Santa Maria, Santa Maria, RS, Brazil
| | - Enio Marchesan
- Department of Plant Science, Universidade Federal de Santa Maria, Santa Maria, RS, Brazil
| | - Renato Zanella
- Department of Chemistry, Universidade Federal de Santa Maria, Santa Maria, RS, Brazil
| | - Bernardo Baldisserotto
- Department of Physiology and Pharmacology, Universidade Federal de Santa Maria, Santa Maria, RS, Brazil
| | - Jaqueline I Golombieski
- Department of Environmental Engineering and Technology, Universidade Federal de Santa Maria, Santa Maria, RS, Brazil.
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31
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Baldissera MD, Souza CF, Golombieski JI, Seben D, Sippert LR, Salbego J, Zanella R, Baldisserotto B. Thiamethoxam induced hepatic energy changes in silver catfish via impairment of the phosphoryl transfer network pathway: Toxicological effects on energetics homeostasis. ENVIRONMENTAL TOXICOLOGY AND PHARMACOLOGY 2018; 60:1-4. [PMID: 29631152 DOI: 10.1016/j.etap.2018.04.002] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/25/2018] [Revised: 03/27/2018] [Accepted: 04/02/2018] [Indexed: 06/08/2023]
Abstract
Precise coupling of spatially separated intracellular adenosine triphosphate (ATP)-producing and ATP-consuming processes exerts a pivotal role in bioenergetic homeostasis of living organisms, and the phosphotransfer network pathway, catalyzed by adenylate kinase (AK) and pyruvate kinase (PK), is fundamental in cellular and tissue energetic homeostasis. Measurement of the phosphotransfer network can provide new information for understanding the alterations in hepatic energetic metabolism during exposition to insecticides, such as thiamethoxam. Therefore, the aim of this study was to evaluate whether exposition to thiamethoxam negatively affects the hepatic enzymes of the phosphotransfer network in silver catfish (Rhamdia quelen). Hepatic AK and PK activities were inhibited at 3.75 μg L-1 after 24 h of exposure and at 1.125 and 3.75 μg L-1 after 96 h of exposure compared with the control group. The hepatic ATP levels were decreased following 3.75 μg L-1 thiamethoxam treatment after 24 h of exposure and at 1.125 and 3.75 μg L-1 after 96 h of exposure compared with the control group. The enzymatic activity of the phosphotransfer network and ATP levels did not recover after 48 h of recovery in clean water. Thus, the inhibition of hepatic AK and PK activities by thiamethoxam caused impairment of energy homeostasis in liver tissue, decreasing hepatic ATP availability. Moreover, the absence of a mutual compensatory mechanism between these enzymes directly contributes to ATP depletion and to a severe energetic dysregulation, which may contribute to toxic effects caused by thiamethoxam.
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Affiliation(s)
- Matheus D Baldissera
- Department of Microbiology and Parasitology, Universidade Federal de Santa Maria, Santa Maria, RS, Brazil.
| | - Carine F Souza
- Department of Physiology and Pharmacology, Universidade Federal de Santa Maria, Santa Maria, RS, Brazil
| | - Jaqueline I Golombieski
- Department of Environmental Engineering and Technology, Universidade Federal de Santa Maria, Santa Maria, RS, Brazil.
| | - Débora Seben
- Department of Environmental Engineering and Technology, Universidade Federal de Santa Maria, Santa Maria, RS, Brazil
| | - Letícia R Sippert
- Department of Environmental Engineering and Technology, Universidade Federal de Santa Maria, Santa Maria, RS, Brazil
| | - Joseânia Salbego
- Department of Physiology and Pharmacology, Universidade Federal de Santa Maria, Santa Maria, RS, Brazil
| | - Renato Zanella
- Department of Chemistry, Universidade Federal de Santa Maria, Santa Maria, RS, Brazil
| | - Bernardo Baldisserotto
- Department of Physiology and Pharmacology, Universidade Federal de Santa Maria, Santa Maria, RS, Brazil
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32
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Pyakurel P, Shin M, Venton BJ. Nicotinic acetylcholine receptor (nAChR) mediated dopamine release in larval Drosophila melanogaster. Neurochem Int 2018; 114:33-41. [PMID: 29305920 DOI: 10.1016/j.neuint.2017.12.012] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/11/2017] [Revised: 12/04/2017] [Accepted: 12/29/2017] [Indexed: 01/13/2023]
Abstract
Acetylcholine is an excitatory neurotransmitter in the central nervous system of insects and the nicotinic acetylcholine receptor (nAChR) is a target for neonicotinoid insecticides. Functional insect nAChRs are difficult to express in host cells, and hence difficult to study. In mammals, acetylcholine and nicotine evoke dopamine release, but the extent to which this mechanism is conserved in insects is unknown. In intact larval ventral nerve cords (VNCs), we studied dopamine evoked by acetylcholine, nicotine, or neonicotinoids. Using fast-scan cyclic voltammetry, we confirmed dopamine was measured by its cyclic voltammogram and also by feeding Drosophila the synthesis inhibitor, 3-iodotyrosine, which lowered the evoked dopamine response. Acetylcholine (1.8 pmol) evoked on average 0.43 ± 0.04 μM dopamine. Dopamine release significantly decreased after incubation with α-bungarotoxin, demonstrating the release is mediated by nAChR, but atropine, a muscarinic AChR antagonist, had no effect. Nicotine (t1/2 = 71 s) and the neonicotinoids nitenpyram and imidacloprid (t1/2 = 86 s, 121 s respectively) also evoked dopamine release, which lasted longer than acetylcholine-stimulated release (t1/2 = 19 s). Nicotine-stimulated dopamine was significantly lower in the presence of sodium channel blocker, tetrodotoxin, showing that the release is exocytotic. Drosophila that have mutations in the nAChR subunit α1 or β2 have significantly lower neonicotinoid-stimulated release but no changes in nicotine-stimulated release. This work demonstrates that nAChR agonists mediate dopamine release in Drosophila larval VNC and that mutations in nAChR subunits affect how insecticides stimulate dopamine release.
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Affiliation(s)
- Poojan Pyakurel
- Department of Chemistry, University of Virginia, United States
| | - Mimi Shin
- Department of Chemistry, University of Virginia, United States
| | - B Jill Venton
- Department of Chemistry, University of Virginia, United States.
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Cartereau A, Martin C, Thany SH. Neonicotinoid insecticides differently modulate acetycholine-induced currents on mammalian α7 nicotinic acetylcholine receptors. Br J Pharmacol 2017; 175:1987-1998. [PMID: 28853147 DOI: 10.1111/bph.14018] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/19/2017] [Revised: 08/11/2017] [Accepted: 08/17/2017] [Indexed: 12/22/2022] Open
Abstract
BACKGROUND AND PURPOSE Neonicotinoid insecticides are described as poor agonists of mammalian nicotinic ACh receptors. In this paper, we show that their effects on mammalian nicotinic receptors differ between compounds. EXPERIMENTAL APPROACH Two-electrode voltage-clamp electrophysiology was used to characterize the pharmacology of three neonicotinoid insecticides on nicotinic α7 receptors expressed in Xenopus oocytes. Single and combined application of clothianidin, acetamiprid and thiamethoxam were tested. RESULTS Two neonicotinoid insecticides, clothianidin and acetamiprid, were partial agonists of mammalian neuronal α7 nicotinic receptors, whereas another neonicotinoid insecticide, thiamethoxam, which is converted to clothianidin in insect and plant tissues, had no effect. Pretreatment with clothianidin and acetamiprid (10 μM) ACh significantly enhanced the subsequent currents evoked by ACh (100 μM ) whereas pretreatment with thiamethoxam (10 μM) reduced ACh-induced current amplitudes.A combination of the three neonicotinoids decreased the ACh-evoked currents. CONCLUSIONS AND IMPLICATIONS The present findings suggest that neonicotinoid insecticides differ markedly in their direct effects on mammalian α7 nicotinic ACh receptors and can also modulate ACh-induced currents. Furthermore, our data indicate a previously unknown modulation of mammalian α7 nicotinic receptors by a combination of clothianidin, acetamiprid and thiamethoxam. LINKED ARTICLES This article is part of a themed section on Nicotinic Acetylcholine Receptors. To view the other articles in this section visit http://onlinelibrary.wiley.com/doi/10.1111/bph.v175.11/issuetoc.
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Affiliation(s)
- Alison Cartereau
- LBLGC, UPRES EA 1207-USC INRA 1328, Université d'Orléans, Orléans, France
| | - Carine Martin
- LBLGC, UPRES EA 1207-USC INRA 1328, Université d'Orléans, Orléans, France
| | - Steeve H Thany
- LBLGC, UPRES EA 1207-USC INRA 1328, Université d'Orléans, Orléans, France
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Hoggard MF, Rodriguez AM, Cano H, Clark E, Tae HS, Adams DJ, Godenschwege TA, Marí F. In vivo and in vitro testing of native α-conotoxins from the injected venom of Conus purpurascens. Neuropharmacology 2017; 127:253-259. [PMID: 28917942 DOI: 10.1016/j.neuropharm.2017.09.020] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/31/2017] [Revised: 08/08/2017] [Accepted: 09/11/2017] [Indexed: 11/17/2022]
Abstract
α-Conotoxins inhibit nicotinic acetylcholine receptors (nAChRs) and are used as probes to study cholinergic pathways in vertebrates. Model organisms, such as Drosophila melanogaster, express nAChRs in their CNS that are suitable to investigate the neuropharmacology of α-conotoxins in vivo. Here we report the paired nanoinjection of native α-conotoxin PIA and two novel α-conotoxins, PIC and PIC[O7], from the injected venom of Conus purpurascens and electrophysiological recordings of their effects on the giant fiber system (GFS) of D. melanogaster and heterologously expressed nAChRs in Xenopus oocytes. α-PIA caused disruption of the function of giant fiber dorsal longitudinal muscle (GF-DLM) pathway by inhibiting the Dα7 nAChR a homolog to the vertebrate α7 nAChR, whereas PIC and PIC[O7] did not. PIC and PIC[O7] reversibly inhibited ACh-evoked currents mediated by vertebrate rodent (r)α1β1δγ, rα1β1δε and human (h)α3β2, but not hα7 nAChR subtypes expressed in Xenopus oocytes with the following selectivity: rα1β1δε > rα1β1δγ ≈ hα3β2 >> hα7. Our study emphasizes the importance of loop size and α-conotoxin sequence specificity for receptor binding. These studies can be used for the evaluation of the neuropharmacology of novel α-conotoxins that can be utilized as molecular probes for diseases such as, Alzheimer's, Parkinson's, and cancer. This article is part of the Special Issue entitled 'Venom-derived Peptides as Pharmacological Tools.'
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Affiliation(s)
- Mickelene F Hoggard
- Marine Biochemical Sciences, Chemical Sciences Division, National Institute of Standards and Technology, 331 Fort Johnson Road, Charleston, SC 29412, USA; Department of Chemistry and Biochemistry, Florida Atlantic University, 777 Glades Road, Boca Raton, FL 33431-0991, USA
| | - Alena M Rodriguez
- Department of Biomedical Science, Florida Atlantic University, 777 Glades Road, Boca Raton, FL 33431-0991, USA
| | - Herminsul Cano
- Department of Chemistry and Biochemistry, Florida Atlantic University, 777 Glades Road, Boca Raton, FL 33431-0991, USA
| | - Evan Clark
- Department of Chemistry and Biochemistry, Florida Atlantic University, 777 Glades Road, Boca Raton, FL 33431-0991, USA
| | - Han-Shen Tae
- Illawarra Health and Medical Research Institute (IHMRI), University of Wollongong, Wollongong, NSW 2522, Australia
| | - David J Adams
- Illawarra Health and Medical Research Institute (IHMRI), University of Wollongong, Wollongong, NSW 2522, Australia
| | - Tanja A Godenschwege
- Department of Biological Sciences, Florida Atlantic University, 777 Glades Road, Boca Raton, FL 33431-0991, USA
| | - Frank Marí
- Marine Biochemical Sciences, Chemical Sciences Division, National Institute of Standards and Technology, 331 Fort Johnson Road, Charleston, SC 29412, USA; Department of Chemistry and Biochemistry, Florida Atlantic University, 777 Glades Road, Boca Raton, FL 33431-0991, USA.
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Benzidane Y, Goven D, Abd-Ella AA, Deshayes C, Lapied B, Raymond V. Subchronic exposure to sublethal dose of imidacloprid changes electrophysiological properties and expression pattern of nicotinic acetylcholine receptor subtypes in insect neurosecretory cells. Neurotoxicology 2017; 62:239-247. [DOI: 10.1016/j.neuro.2017.08.001] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/10/2017] [Revised: 07/21/2017] [Accepted: 08/05/2017] [Indexed: 10/19/2022]
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Crossthwaite AJ, Bigot A, Camblin P, Goodchild J, Lind RJ, Slater R, Maienfisch P. The invertebrate pharmacology of insecticides acting at nicotinic acetylcholine receptors. JOURNAL OF PESTICIDE SCIENCE 2017; 42:67-83. [PMID: 30363948 PMCID: PMC6183333 DOI: 10.1584/jpestics.d17-019] [Citation(s) in RCA: 21] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/09/2017] [Accepted: 06/19/2017] [Indexed: 05/20/2023]
Abstract
The nicotinic acetylcholine receptor (nAChR) is a ligand-gated ion channel composed of 5 protein subunits arranged around a central cation selective pore. Several classes of natural and synthetic insecticides mediate their effect through interacting at nAChRs. This review examines the basic pharmacology of the neonicotinoids and related chemistry, with an emphasis on sap-feeding insects from the order Hemiptera, the principle pest target for such insecticides. Although the receptor subunit stoichiometry for endogenous invertebrate nAChRs is unknown, there is clear evidence for the existence of distinct neonicotinoid binding sites in native insect preparations, which reflects the predicted wide repertoire of nAChRs and differing pharmacology within this insecticide class. The spinosyns are principally used to control chewing pests such as Lepidoptera, whilst nereistoxin analogues are used on pests of rice and vegetables through contact and systemic action, the pharmacology of both these insecticides is unique and different to that of the neonicotinoids.
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Affiliation(s)
- Andrew J. Crossthwaite
- Syngenta Crop Protection, Jealott’s Hill International Research Centre, Bracknell, Berkshire, RG42 6EY, UK
| | - Aurelien Bigot
- Syngenta Crop Protection AG, Schaffhauserstrasse 101, CH-4332 Stein, Switzerland
| | - Philippe Camblin
- Syngenta Crop Protection AG, Schwarzwaldallee 215, CH-4002 Basel, Switzerland
| | - Jim Goodchild
- Syngenta Crop Protection, Jealott’s Hill International Research Centre, Bracknell, Berkshire, RG42 6EY, UK
| | - Robert J. Lind
- Syngenta Crop Protection, Jealott’s Hill International Research Centre, Bracknell, Berkshire, RG42 6EY, UK
| | - Russell Slater
- Syngenta Crop Protection AG, Schwarzwaldallee 215, CH-4002 Basel, Switzerland
| | - Peter Maienfisch
- Syngenta Crop Protection AG, Schwarzwaldallee 215, CH-4002 Basel, Switzerland
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Hirata K, Jouraku A, Kuwazaki S, Shimomura H, Iwasa T. Studies on Aphis gossypii cytochrome P450s CYP6CY22 and CYP6CY13 using an in vitro system. JOURNAL OF PESTICIDE SCIENCE 2017; 42:97-104. [PMID: 30363391 PMCID: PMC6173126 DOI: 10.1584/jpestics.d17-006] [Citation(s) in RCA: 27] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/27/2017] [Accepted: 05/17/2017] [Indexed: 05/21/2023]
Abstract
A field-collected Aphis gossypii clone [Kushima resistant (KR) clone] was resistant to neonicotinoid insecticides (23.8- to 394-fold). RNA-seq and next-generation sequence analyses were conducted to identify nine cytochrome P450 (CYP) genes that were significantly upregulated in the KR clone as compared with those in the insecticide-susceptible clone. A. gossypii P450s were transiently and efficiently expressed in S2 cell to show that CYP6CY22 (c21228) and CYP6CY13 (c21368), which were the most upregulated of the nine P450s in the KR clone, did not degrade sulfoxaflor, a new class of insecticides acting on insect nAChRs, but markedly metabolized all of the neonicotinoids tested. Hence, P450s are likely to underpin neonicotinoid resistance in other aphids as well in the future, and the P450 expression protocol established here will prompt studies on P450-medidated insecticide resistance and structural analyses of relevant metabolites.
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Affiliation(s)
- Koichi Hirata
- Odawara Research Center, Nippon soda Co., Ltd., 345 Takada, Odawara, Kanagawa 250–0216, Japan
| | - Akiya Jouraku
- Insect Genome Research and Engineering Unit, Division of Applied Genetics, Institute of Agrobiological Sciences, NARO, 1–2 Owashi, Tsukuba, Ibaraki 305–8634, Japan
| | - Seigo Kuwazaki
- Insect Genome Research and Engineering Unit, Division of Applied Genetics, Institute of Agrobiological Sciences, NARO, 1–2 Owashi, Tsukuba, Ibaraki 305–8634, Japan
| | - Hajime Shimomura
- Odawara Research Center, Nippon soda Co., Ltd., 345 Takada, Odawara, Kanagawa 250–0216, Japan
| | - Takao Iwasa
- Odawara Research Center, Nippon soda Co., Ltd., 345 Takada, Odawara, Kanagawa 250–0216, Japan
- To whom correspondence should be addressed. E-mail:
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Okuhara D, Furutani S, Ito K, Ihara M, Matsuda K. Splice Variants of pH-Sensitive Chloride Channel Identify a Key Determinant of Ivermectin Sensitivity in the Larvae of the Silkworm Bombyx mori. Mol Pharmacol 2017; 92:491-499. [PMID: 28739571 DOI: 10.1124/mol.117.109199] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/02/2017] [Accepted: 07/20/2017] [Indexed: 11/22/2022] Open
Abstract
The pH-sensitive chloride channels (pHCls) are broadly expressed in insects, but little is known about their physiologic role, diversity, and sensitivity to insecticides acting on relevant chloride channels. Here we have sequenced 50 transcripts of the pHCl-1 gene from the brain, third thoracic ganglion (T3G), and midgut of larvae of silkworm Bombyx mori It was found that >50 variants were expressed with distinct splicing in the T3G compared with the brain and midgut. Of the variants detected, variant 9, which was expressed most abundantly in the larvae, was reconstituted in Xenopus laevis oocytes to characterize its pH and ivermectin sensitivity. Variant 9 formed a functional pHCl with half-maximal activation at a pH of 7.87, and was activated by ivermectin irrespective of the extracellular pH. This was in contrast to variant 1, which was activated more profoundly at acidic rather than basic pH. To identify a key determinant for such differential ivermectin sensitivity, different amino acids in variants 1 and 9 were swapped, and the effects of the mutations on ivermectin sensitivity were investigated. The V275S mutation of variant 1 enhanced ivermectin sensitivity, whereas the S275V mutation of variant 9 caused a reduction in sensitivity. In homology models of the Bombyx pHCls, Val275 of variant 1 interacted more strongly with Ala273 than Ser275 of variant 9 at the channel gate. This interaction is likely to prevent ivermectin-induced opening of the channel, accounting, at least partially, for the differential macrolide action on the two variants.
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Affiliation(s)
- Daiki Okuhara
- Department of Applied Biological Chemistry, Faculty of Agriculture, Kindai University, Nara, Japan (D.O., S.F., M.I., K.M.); Department of Science of Biological Production, Tokyo University of Agriculture and Technology, Fuchu, Tokyo, Japan (K.I.)
| | - Shogo Furutani
- Department of Applied Biological Chemistry, Faculty of Agriculture, Kindai University, Nara, Japan (D.O., S.F., M.I., K.M.); Department of Science of Biological Production, Tokyo University of Agriculture and Technology, Fuchu, Tokyo, Japan (K.I.)
| | - Katsuhiko Ito
- Department of Applied Biological Chemistry, Faculty of Agriculture, Kindai University, Nara, Japan (D.O., S.F., M.I., K.M.); Department of Science of Biological Production, Tokyo University of Agriculture and Technology, Fuchu, Tokyo, Japan (K.I.)
| | - Makoto Ihara
- Department of Applied Biological Chemistry, Faculty of Agriculture, Kindai University, Nara, Japan (D.O., S.F., M.I., K.M.); Department of Science of Biological Production, Tokyo University of Agriculture and Technology, Fuchu, Tokyo, Japan (K.I.)
| | - Kazuhiko Matsuda
- Department of Applied Biological Chemistry, Faculty of Agriculture, Kindai University, Nara, Japan (D.O., S.F., M.I., K.M.); Department of Science of Biological Production, Tokyo University of Agriculture and Technology, Fuchu, Tokyo, Japan (K.I.)
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de Lima E Silva C, Brennan N, Brouwer JM, Commandeur D, Verweij RA, van Gestel CAM. Comparative toxicity of imidacloprid and thiacloprid to different species of soil invertebrates. ECOTOXICOLOGY (LONDON, ENGLAND) 2017; 26:555-564. [PMID: 28337632 PMCID: PMC5420372 DOI: 10.1007/s10646-017-1790-7] [Citation(s) in RCA: 56] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Accepted: 03/03/2017] [Indexed: 05/20/2023]
Abstract
Neonicotinoid insecticides have come under increasing scrutiny for their impact on non-target organisms, especially pollinators. The current scientific literature is mainly focused on the impact of these insecticides on pollinators and some aquatic insects, leaving a knowledge gap concerning soil invertebrates. This study aimed at filling this gap, by determining the toxicity of imidacloprid and thiacloprid to five species of soil invertebrates: earthworms (Eisenia andrei), enchytraeids (Enchytraeus crypticus), Collembola (Folsomia candida), oribatid mites (Oppia nitens) and isopods (Porcellio scaber). Tests focused on survival and reproduction or growth, after 3-5 weeks exposure in natural LUFA 2.2 standard soil. Imidacloprid was more toxic than thiacloprid for all species tested. F. candida and E. andrei were the most sensitive species, with LC50s of 0.20-0.62 and 0.77 mg/kg dry soil for imidacloprid and 2.7-3.9 and 7.1 mg/kg dry soil for thiacloprid. EC50s for effects on the reproduction of F. candida and E. andrei were 0.097-0.30 and 0.39 mg/kg dry soil for imidacloprid and 1.7-2.4 and 0.44 mg/kg dry soil for thiacloprid. The least sensitive species were O. nitens and P. scaber. Enchytraeids were a factor of 5-40 less sensitive than the taxonomically related earthworm, depending on the endpoint considered. Although not all the species showed high sensitivity to the neonicotinoids tested, these results raise awareness about the effects these insecticides can have on non-target soil invertebrates.
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Affiliation(s)
- Cláudia de Lima E Silva
- Department of Ecological Science, Faculty of Earth and Life Sciences, Vrije Universiteit, De Boelelaan 1085, 1081 HV, Amsterdam, The Netherlands
| | - Nicola Brennan
- Department of Ecological Science, Faculty of Earth and Life Sciences, Vrije Universiteit, De Boelelaan 1085, 1081 HV, Amsterdam, The Netherlands
| | - Jitske M Brouwer
- Department of Ecological Science, Faculty of Earth and Life Sciences, Vrije Universiteit, De Boelelaan 1085, 1081 HV, Amsterdam, The Netherlands
| | - Daniël Commandeur
- Department of Ecological Science, Faculty of Earth and Life Sciences, Vrije Universiteit, De Boelelaan 1085, 1081 HV, Amsterdam, The Netherlands
| | - Rudo A Verweij
- Department of Ecological Science, Faculty of Earth and Life Sciences, Vrije Universiteit, De Boelelaan 1085, 1081 HV, Amsterdam, The Netherlands
| | - Cornelis A M van Gestel
- Department of Ecological Science, Faculty of Earth and Life Sciences, Vrije Universiteit, De Boelelaan 1085, 1081 HV, Amsterdam, The Netherlands.
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Taylor-Wells J, Hawkins J, Colombo C, Bermudez I, Jones AK. Cloning and functional expression of intracellular loop variants of the honey bee (Apis mellifera) RDL GABA receptor. Neurotoxicology 2017; 60:207-213. [DOI: 10.1016/j.neuro.2016.06.007] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/11/2015] [Revised: 05/26/2016] [Accepted: 06/07/2016] [Indexed: 01/20/2023]
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LaLone CA, Villeneuve DL, Wu-Smart J, Milsk RY, Sappington K, Garber KV, Housenger J, Ankley GT. Weight of evidence evaluation of a network of adverse outcome pathways linking activation of the nicotinic acetylcholine receptor in honey bees to colony death. THE SCIENCE OF THE TOTAL ENVIRONMENT 2017; 584-585:751-775. [PMID: 28126277 PMCID: PMC6156782 DOI: 10.1016/j.scitotenv.2017.01.113] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/18/2016] [Revised: 01/17/2017] [Accepted: 01/18/2017] [Indexed: 04/14/2023]
Abstract
Ongoing honey bee (Apis mellifera) colony losses are of significant international concern because of the essential role these insects play in pollinating crops. Both chemical and non-chemical stressors have been implicated as possible contributors to colony failure; however, the potential role(s) of commonly-used neonicotinoid insecticides has emerged as particularly concerning. Neonicotinoids act on the nicotinic acetylcholine receptors (nAChRs) in the central nervous system to eliminate pest insects. However, mounting evidence indicates that neonicotinoids also may adversely affect beneficial pollinators, such as the honey bee, via impairments on learning and memory, and ultimately foraging success. The specific mechanisms linking activation of the nAChR to adverse effects on learning and memory are uncertain. Additionally, clear connections between observed impacts on individual bees and colony level effects are lacking. The objective of this review was to develop adverse outcome pathways (AOPs) as a means to evaluate the biological plausibility and empirical evidence supporting (or refuting) the linkage between activation of the physiological target site, the nAChR, and colony level consequences. Potential for exposure was not a consideration in AOP development and therefore this effort should not be considered a risk assessment. Nonetheless, development of the AOPs described herein has led to the identification of research gaps which, for example, may be of high priority in understanding how perturbation of pathways involved in neurotransmission can adversely affect normal colony functions, causing colony instability and subsequent bee population failure. A putative AOP network was developed, laying the foundation for further insights as to the role of combined chemical and non-chemical stressors in impacting bee populations. Insights gained from the AOP network assembly, which more realistically represents multi-stressor impacts on honey bee colonies, are promising toward understanding common sensitive nodes in key biological pathways and identifying where mitigation strategies may be focused to reduce colony losses.
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Affiliation(s)
- Carlie A LaLone
- U.S. Environmental Protection Agency, Office of Research and Development, National Health and Environmental Effects Research Laboratory, Mid-Continent Ecology Division, 6201 Congdon Blvd., Duluth, MN 55804, USA.
| | - Daniel L Villeneuve
- U.S. Environmental Protection Agency, Office of Research and Development, National Health and Environmental Effects Research Laboratory, Mid-Continent Ecology Division, 6201 Congdon Blvd., Duluth, MN 55804, USA
| | - Judy Wu-Smart
- University of Nebraska-Lincoln, Department of Entomology, 105A Entomology Hall, Lincoln, NE 68583, USA
| | - Rebecca Y Milsk
- ORISE Research Participation Program, U.S. Environmental Protection Agency, Office of Research and Development, National Health and Environmental Effects Research Laboratory, Mid-Continent Ecology Division, 6201 Congdon Blvd., Duluth, MN 55804, USA
| | - Keith Sappington
- U.S. Environmental Protection Agency, Office of Pesticide Programs, Washington D.C. 20460, USA
| | - Kristina V Garber
- U.S. Environmental Protection Agency, Office of Pesticide Programs, Washington D.C. 20460, USA
| | - Justin Housenger
- U.S. Environmental Protection Agency, Office of Pesticide Programs, Washington D.C. 20460, USA
| | - Gerald T Ankley
- U.S. Environmental Protection Agency, Office of Research and Development, National Health and Environmental Effects Research Laboratory, Mid-Continent Ecology Division, 6201 Congdon Blvd., Duluth, MN 55804, USA
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Taylor-Wells J, Jones AK. Variations in the Insect GABA Receptor, RDL, and Their Impact on Receptor Pharmacology. ACS SYMPOSIUM SERIES 2017. [DOI: 10.1021/bk-2017-1265.ch001] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Affiliation(s)
- Jennina Taylor-Wells
- Faculty of Health and Life Sciences, Department of Biological and Medical Sciences, Oxford Brookes University, Headington, Oxford OX3 8NZ, United Kingdom
| | - Andrew K. Jones
- Faculty of Health and Life Sciences, Department of Biological and Medical Sciences, Oxford Brookes University, Headington, Oxford OX3 8NZ, United Kingdom
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Kayser H, Lehmann K, Gomes M, Schleicher W, Dotzauer K, Moron M, Maienfisch P. Binding of imidacloprid, thiamethoxam and N-desmethylthiamethoxam to nicotinic receptors of Myzus persicae: pharmacological profiling using neonicotinoids, natural agonists and antagonists. PEST MANAGEMENT SCIENCE 2016; 72:2166-2175. [PMID: 26842010 DOI: 10.1002/ps.4249] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/02/2015] [Revised: 01/16/2016] [Accepted: 01/30/2016] [Indexed: 06/05/2023]
Abstract
BACKGROUND The increasing structural diversity of the neonicotinoid class of insecticides presently used in crop protection calls for a more detailed analysis of their mode of action at their cellular targets, the nicotinic acetylcholine receptors. RESULTS Comparative radioligand binding studies using membranes of Myzus persicae (Sulzer) and representatives of the chloropyridyl subclass (imidacloprid), the chlorothiazolyl subclass (thiamethoxam), the tetrahydrofuranyl subclass (dinotefuran), as well as the novel sulfoximine type (sulfoxaflor), which is not a neonicotinoid, reveal significant differences in the number of binding sites, the displacing potencies and the mode of binding interference. Furthermore, the mode of interaction of [3 H]thiamethoxam and the nicotinic antagonists methyllycaconitine and dihydro-β-erythroidine is unique, with Hill values of >1, clearly different to the values of around unity for [3 H]imidacloprid and [3 H]N-desmethylthiamethoxam. The interaction of [3 H]N-desmethylthiamethoxam with the agonist (-)nicotine is also characterised by a Hill value of >1. CONCLUSIONS There is no single conserved site or mode of binding of neonicotinoids and related nicotinic ligands to their target receptor, but a variety of binding pockets depending on the combination of receptor subunits, the receptor subtype, its functional state, as well as the structural flexibility of both the binding pockets and the ligands. © 2016 Society of Chemical Industry.
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Affiliation(s)
- Hartmut Kayser
- Institute of General Zoology and Endocrinology, Ulm University, Ulm, Germany.
| | - Katrin Lehmann
- Institute of General Zoology and Endocrinology, Ulm University, Ulm, Germany
| | | | - Wolfgang Schleicher
- Institute of General Zoology and Endocrinology, Ulm University, Ulm, Germany
| | - Karin Dotzauer
- Institute of General Zoology and Endocrinology, Ulm University, Ulm, Germany
| | - Margarethe Moron
- Institute of General Zoology and Endocrinology, Ulm University, Ulm, Germany
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Mannai S, Bitri L, Thany SH. cGMP/cGMP-dependent protein kinase pathway modulates nicotine-induced currents through the activation of α-bungarotoxin-insensitive nicotinic acetylcholine receptors from insect neurosecretory cells. J Neurochem 2016; 137:931-8. [PMID: 27059649 DOI: 10.1111/jnc.13633] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/20/2016] [Revised: 03/24/2016] [Accepted: 03/24/2016] [Indexed: 11/28/2022]
Abstract
Insect neurosecretory cells, called dorsal unpaired median neurons, are known to express two α-bungarotoxin-insensitive nicotinic acetylcholine receptor (nAChR) subtypes, nAChR1 and nAChR2. It was demonstrated that nAChR1 was sensitive to cAMP/cAMP-dependent protein kinase (PKA) regulation, resulting in a modulation of nicotine currents. In this study, we show that cyclic guanosine monophosphate (cGMP)/cGMP-dependent protein kinase (PKG) pathway modulates nicotine-induced currents, as increased cGMP affects the second compound of the biphasic current-voltage curve, corresponding to the nAChR2 receptors. Indeed, maintaining the guanosine triphosphate level with 100 μM guanosine triphosphate-γ-S increased nicotine currents through nAChR2. We also demonstrated that inhibition of PKG activity with 0.2 μM (8R,9S,11S)-(-)-9-methoxy-carbamyl-8-methyl-2,3,9,10-tetrahydro-8,11-epoxy-1H,8H,11H-2,7b,11a-trizadibenzo-(a,g)-cycloocta-(c,d,e)-trinden-1-one (KT5823), a PKG specific inhibitor, reduced nicotine-induced current amplitudes. KT5823 effect on nicotine currents is associated with calcium (Ca(2+) ) activity because inhibition of Ca(2+) concentration with cadmium chloride (CdCl2 ) abolished KT5823-induced inhibition mediated by nAChR2. However, specific inhibition of nitric oxide-guanylyl cyclase (GC) complex by 10 μM 1H-[1,2,4]oxadiazolo[4,3-a]quinoxalin-1-one (ODQ) significantly increased nicotine-induced current amplitudes on both nAChR1 and nAChR2. These results suggest that nicotine-induced currents mediated by both α-bungarotoxin-insensitive nAChR1 and nAChR2 are coupled to the cGMP/PKG pathway. We propose that nicotinic acetylcholine receptor activation induces an increase in intracellular calcium (Ca(2+) ) concentration. Elevation of intracellular Ca(2+) results in the formation of Ca(2+) -calmodulin (CaM) complex, which activates guanylyl cyclase (GC) and/or adenylyl cyclase (AC). Ca(2+) -CaM complex could activate Ca(2+) calmodulin kinase II which could directly or indirectly modulate the nicotinic response. The mechanisms by which cyclic adenosine monophosphate (cAMP) and cyclic guanosine monophosphate (cGMP) interact remain unclear. We demonstrate that nicotine-induced currents are coupled to the cGMP/PKG pathway.
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Affiliation(s)
- Safa Mannai
- Université d'Orléans, Laboratoire de Biologie des Ligneux et des Grandes Cultures (LBLGC), UPRES EA, Rue de Chartres, Orléans, France.,Université de Tunis El Manar, Faculté des Sciences, Campus Universitaire Farhat Hached, Rommana Tunis, Tunisie
| | - Lofti Bitri
- Université de Tunis El Manar, Faculté des Sciences, Campus Universitaire Farhat Hached, Rommana Tunis, Tunisie
| | - Steeve H Thany
- Université d'Orléans, Laboratoire de Biologie des Ligneux et des Grandes Cultures (LBLGC), UPRES EA, Rue de Chartres, Orléans, France
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Apaire-Marchais V, Ogliastro M, Chandre F, Pennetier C, Raymond V, Lapied B. Virus and calcium: an unexpected tandem to optimize insecticide efficacy. ENVIRONMENTAL MICROBIOLOGY REPORTS 2016; 8:168-178. [PMID: 26743399 DOI: 10.1111/1758-2229.12377] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/16/2015] [Revised: 12/13/2015] [Accepted: 12/22/2015] [Indexed: 06/05/2023]
Abstract
The effective control of insect pests is based on the rational use of the most efficient and safe insecticide treatments. To increase the effects of classical insecticides and to avoid the ability of certain pest insects to develop resistance, it is essential to propose novel strategies. Previous studies have shown that calcium-dependent phosphorylation/dephosphorylation is now considered as a new cellular mechanism for increasing the target sensitivity to insecticides. Because it is known that virus entry is correlated with intracellular calcium concentration rise, this report attempts to present the most important data relevant to the feasibility of combining an insect virus such as baculovirus or densovirus with an insecticide. In this case, the insect virus is not used as a bioinsecticide but acts as a synergistic agent able to trigger calcium rise and to activate calcium-dependent intracellular signalling pathways involved in the increase of the membrane receptors and/or ion channels sensitivity to insecticides. This virus-insecticide mixture represents a promising alternative to optimize the efficacy of insecticides against insect pests while reducing the doses.
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Affiliation(s)
- Véronique Apaire-Marchais
- Laboratoire RCIM, UPRES EA 2647/USC INRA 1330, SFR 4207 QUASAV, UFR Sciences, Université d'Angers, 2 boulevard Lavoisier, F-49045, Angers, France
| | - Mylène Ogliastro
- DGIMI UMR 1333 INRA UM2, Place Eugène Bataillon, cc101, 34095, Montpellier, France
| | - Fabrice Chandre
- UMR MIVEGEC (IRD 224, CNRS 5290, UM), 911 Avenue Agropolis BP 64501, 34394, Montpellier, France
| | - Cédric Pennetier
- UMR MIVEGEC (IRD 224, CNRS 5290, UM), 911 Avenue Agropolis BP 64501, 34394, Montpellier, France
| | - Valérie Raymond
- Laboratoire RCIM, UPRES EA 2647/USC INRA 1330, SFR 4207 QUASAV, UFR Sciences, Université d'Angers, 2 boulevard Lavoisier, F-49045, Angers, France
| | - Bruno Lapied
- Laboratoire RCIM, UPRES EA 2647/USC INRA 1330, SFR 4207 QUASAV, UFR Sciences, Université d'Angers, 2 boulevard Lavoisier, F-49045, Angers, France
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Barnstedt O, Owald D, Felsenberg J, Brain R, Moszynski JP, Talbot CB, Perrat PN, Waddell S. Memory-Relevant Mushroom Body Output Synapses Are Cholinergic. Neuron 2016; 89:1237-1247. [PMID: 26948892 PMCID: PMC4819445 DOI: 10.1016/j.neuron.2016.02.015] [Citation(s) in RCA: 119] [Impact Index Per Article: 14.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/22/2015] [Revised: 01/04/2016] [Accepted: 01/27/2016] [Indexed: 11/17/2022]
Abstract
Memories are stored in the fan-out fan-in neural architectures of the mammalian cerebellum and hippocampus and the insect mushroom bodies. However, whereas key plasticity occurs at glutamatergic synapses in mammals, the neurochemistry of the memory-storing mushroom body Kenyon cell output synapses is unknown. Here we demonstrate a role for acetylcholine (ACh) in Drosophila. Kenyon cells express the ACh-processing proteins ChAT and VAChT, and reducing their expression impairs learned olfactory-driven behavior. Local ACh application, or direct Kenyon cell activation, evokes activity in mushroom body output neurons (MBONs). MBON activation depends on VAChT expression in Kenyon cells and is blocked by ACh receptor antagonism. Furthermore, reducing nicotinic ACh receptor subunit expression in MBONs compromises odor-evoked activation and redirects odor-driven behavior. Lastly, peptidergic corelease enhances ACh-evoked responses in MBONs, suggesting an interaction between the fast- and slow-acting transmitters. Therefore, olfactory memories in Drosophila are likely stored as plasticity of cholinergic synapses. Mushroom body Kenyon cell function requires ChAT and VAChT expression Kenyon cell-released acetylcholine drives mushroom body output neurons Blocking nicotinic receptors impairs mushroom body output neuron activation Acetylcholine interacts with coreleased neuropeptide
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Affiliation(s)
- Oliver Barnstedt
- Centre for Neural Circuits and Behaviour, The University of Oxford, Tinsley Building, Mansfield Road, Oxford OX1 3SR, UK
| | - David Owald
- Centre for Neural Circuits and Behaviour, The University of Oxford, Tinsley Building, Mansfield Road, Oxford OX1 3SR, UK.
| | - Johannes Felsenberg
- Centre for Neural Circuits and Behaviour, The University of Oxford, Tinsley Building, Mansfield Road, Oxford OX1 3SR, UK
| | - Ruth Brain
- Centre for Neural Circuits and Behaviour, The University of Oxford, Tinsley Building, Mansfield Road, Oxford OX1 3SR, UK
| | - John-Paul Moszynski
- Centre for Neural Circuits and Behaviour, The University of Oxford, Tinsley Building, Mansfield Road, Oxford OX1 3SR, UK
| | - Clifford B Talbot
- Centre for Neural Circuits and Behaviour, The University of Oxford, Tinsley Building, Mansfield Road, Oxford OX1 3SR, UK
| | - Paola N Perrat
- Department of Neurobiology, UMass Medical School, Worcester, MA 01605, USA
| | - Scott Waddell
- Centre for Neural Circuits and Behaviour, The University of Oxford, Tinsley Building, Mansfield Road, Oxford OX1 3SR, UK.
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Beck ME, Gutbrod O, Matthiesen S. Insight into the Binding Mode of Agonists of the Nicotinic Acetylcholine Receptor from Calculated Electron Densities. Chemphyschem 2015; 16:2760-2767. [PMID: 26175091 PMCID: PMC4576818 DOI: 10.1002/cphc.201500341] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/28/2015] [Indexed: 01/22/2023]
Abstract
Insect nicotinic acetylcholine receptors (nAChRs) are among the most prominent and most economically important insecticide targets. Thus, an understanding of the modes of binding of respective agonists is important for the design of specific compounds with favorable vertebrate profiles. In the case of nAChRs, the lack of available high-resolution X-ray structures leaves theoretical considerations as the only viable option. Starting from classical homology and docking approaches, binding mode hypotheses are created for five agonists of the nAChR, covering insecticides in the main group 4 of the Insecticide Resistance Action Committee (IRAC) mode of action (MoA) classification, namely, neonicotinoids, nicotine, sulfoxaflor, and butenolides. To better understand these binding modes, the topologies of calculated electron densities of small-model systems are analyzed in the framework of the quantum theory of atoms in molecules. The theoretically obtained modes of binding are very much in line with the biology-driven IRAC MoA classification of the investigated ligands.
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Affiliation(s)
- Michael E Beck
- Head of Computational Science, Bayer CropScience AG, R&D-SMR-RT-Computational Science, Alfred-Nobel-Strasse 5040789 Monheim am Rhein (Germany)
| | - Oliver Gutbrod
- Molecular Modelling, Bayer CropScience AG, R&D-SMR-RT-Computational Science, Alfred-Nobel-Strasse 5040789 Monheim am Rhein (Germany)
| | - Svend Matthiesen
- Molecular Modelling, Bayer CropScience AG, R&D-SMR-RT-Computational Science, Alfred-Nobel-Strasse 5040789 Monheim am Rhein (Germany)
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Abd-Ella A, Stankiewicz M, Mikulska K, Nowak W, Pennetier C, Goulu M, Fruchart-Gaillard C, Licznar P, Apaire-Marchais V, List O, Corbel V, Servent D, Lapied B. The Repellent DEET Potentiates Carbamate Effects via Insect Muscarinic Receptor Interactions: An Alternative Strategy to Control Insect Vector-Borne Diseases. PLoS One 2015; 10:e0126406. [PMID: 25961834 PMCID: PMC4427492 DOI: 10.1371/journal.pone.0126406] [Citation(s) in RCA: 30] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/16/2014] [Accepted: 04/01/2015] [Indexed: 11/25/2022] Open
Abstract
Insect vector-borne diseases remain one of the principal causes of human mortality. In addition to conventional measures of insect control, repellents continue to be the mainstay for personal protection. Because of the increasing pyrethroid-resistant mosquito populations, alternative strategies to reconstitute pyrethroid repellency and knock-down effects have been proposed by mixing the repellent DEET (N,N-Diethyl-3-methylbenzamide) with non-pyrethroid insecticide to better control resistant insect vector-borne diseases. By using electrophysiological, biochemichal, in vivo toxicological techniques together with calcium imaging, binding studies and in silico docking, we have shown that DEET, at low concentrations, interacts with high affinity with insect M1/M3 mAChR allosteric site potentiating agonist effects on mAChRs coupled to phospholipase C second messenger pathway. This increases the anticholinesterase activity of the carbamate propoxur through calcium-dependent regulation of acetylcholinesterase. At high concentrations, DEET interacts with low affinity on distinct M1/M3 mAChR site, counteracting the potentiation. Similar dose-dependent dual effects of DEET have also been observed at synaptic mAChR level. Additionally, binding and in silico docking studies performed on human M1 and M3 mAChR subtypes indicate that DEET only displays a low affinity antagonist profile on these M1/M3 mAChRs. These results reveal a selective high affinity positive allosteric site for DEET in insect mAChRs. Finally, bioassays conducted on Aedes aegypti confirm the synergistic interaction between DEET and propoxur observed in vitro, resulting in a higher mortality of mosquitoes. Our findings reveal an unusual allosterically potentiating action of the repellent DEET, which involves a selective site in insect. These results open exciting research areas in public health particularly in the control of the pyrethroid-resistant insect-vector borne diseases. Mixing low doses of DEET and a non-pyrethroid insecticide will lead to improvement in the efficiency treatments thus reducing both the concentration of active ingredients and side effects for non-target organisms. The discovery of this insect specific site may pave the way for the development of new strategies essential in the management of chemical use against resistant mosquitoes.
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Affiliation(s)
- Aly Abd-Ella
- Laboratoire Récepteurs et Canaux Ioniques Membranaires (RCIM) UPRES EA 2647/USC INRA 1330, SFR 4207 QUASAV, Université d’Angers, UFR SCIENCES, Angers cedex, France
- Plant Protection Department, Faculty of Agriculture, Assiut University, Assiut, Egypt
| | - Maria Stankiewicz
- Faculty of Biology and Environment Protection, N. Copernicus University, Torun, Poland
| | - Karolina Mikulska
- Institute of Physics, Faculty of Physics, Astronomy and Informatics, N. Copernicus University, Torun, Poland
| | - Wieslaw Nowak
- Institute of Physics, Faculty of Physics, Astronomy and Informatics, N. Copernicus University, Torun, Poland
| | - Cédric Pennetier
- Institut de Recherche pour le Développement, UMR 224 Maladies Infectieuses et Vecteurs: Ecologie, Génétique, Evolution et Contrôle (MiVEGEC), Montpellier, France
| | - Mathilde Goulu
- Laboratoire Récepteurs et Canaux Ioniques Membranaires (RCIM) UPRES EA 2647/USC INRA 1330, SFR 4207 QUASAV, Université d’Angers, UFR SCIENCES, Angers cedex, France
| | - Carole Fruchart-Gaillard
- CEA, iBiTecS, Service d’Ingénierie Moléculaire des Protéines (SIMOPRO), Laboratoire de Toxinologie Moléculaire et Biotechnologie, Gif sur Yvette, France
| | - Patricia Licznar
- Laboratoire Récepteurs et Canaux Ioniques Membranaires (RCIM) UPRES EA 2647/USC INRA 1330, SFR 4207 QUASAV, Université d’Angers, UFR SCIENCES, Angers cedex, France
| | - Véronique Apaire-Marchais
- Laboratoire Récepteurs et Canaux Ioniques Membranaires (RCIM) UPRES EA 2647/USC INRA 1330, SFR 4207 QUASAV, Université d’Angers, UFR SCIENCES, Angers cedex, France
| | - Olivier List
- Laboratoire Récepteurs et Canaux Ioniques Membranaires (RCIM) UPRES EA 2647/USC INRA 1330, SFR 4207 QUASAV, Université d’Angers, UFR SCIENCES, Angers cedex, France
| | - Vincent Corbel
- Institut de Recherche pour le Développement, UMR 224 Maladies Infectieuses et Vecteurs: Ecologie, Génétique, Evolution et Contrôle (MiVEGEC), Montpellier, France
- Department of Entomology, Faculty of Agriculture at Kamphaeng Saen, Kamphaeng Saen Campus, Kasetsart University, Nakhon Pathom, Thailand
| | - Denis Servent
- CEA, iBiTecS, Service d’Ingénierie Moléculaire des Protéines (SIMOPRO), Laboratoire de Toxinologie Moléculaire et Biotechnologie, Gif sur Yvette, France
| | - Bruno Lapied
- Laboratoire Récepteurs et Canaux Ioniques Membranaires (RCIM) UPRES EA 2647/USC INRA 1330, SFR 4207 QUASAV, Université d’Angers, UFR SCIENCES, Angers cedex, France
- * E-mail:
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Synaptic and circuit mechanisms promoting broadband transmission of olfactory stimulus dynamics. Nat Neurosci 2014; 18:56-65. [PMID: 25485755 PMCID: PMC4289142 DOI: 10.1038/nn.3895] [Citation(s) in RCA: 69] [Impact Index Per Article: 6.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/02/2014] [Accepted: 11/13/2014] [Indexed: 12/12/2022]
Abstract
Sensory stimuli fluctuate on many timescales. However, short-term plasticity causes synapses to act as temporal filters, limiting the range of frequencies that they can transmit. How synapses in vivo might transmit a range of frequencies in spite of short-term plasticity is poorly understood. The first synapse in the Drosophila olfactory system exhibits short-term depression, but can transmit broadband signals. Here we describe two mechanisms that broaden the frequency characteristics of this synapse. First, two distinct excitatory postsynaptic currents transmit signals on different timescales. Second, presynaptic inhibition dynamically updates synaptic properties to promote accurate transmission of signals across a wide range of frequencies. Inhibition is transient, but grows slowly, and simulations reveal that these two features of inhibition promote broadband synaptic transmission. Dynamic inhibition is often thought to restrict the temporal patterns that a neuron responds to, but our results illustrate a different idea: inhibition can expand the bandwidth of neural coding.
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Heghinian MD, Mejia M, Adams DJ, Godenschwege TA, Marí F. Inhibition of cholinergic pathways in Drosophila melanogaster by α-conotoxins. FASEB J 2014; 29:1011-8. [PMID: 25466886 DOI: 10.1096/fj.14-262733] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Abstract
Nicotinic acetylcholine receptors (nAChRs) play a pivotal role in synaptic transmission of neuronal signaling pathways and are fundamentally involved in neuronal disorders, including Alzheimer's disease, Parkinson's disease, and schizophrenia. In vertebrates, cholinergic pathways can be selectively inhibited by α-conotoxins; we show that in the model organism Drosophila, the cholinergic component of the giant fiber system is inhibited by α-conotoxins MII, AuIB, BuIA, EI, PeIA, and ImI. The injection of 45 pmol/fly of each toxin dramatically decreases the response of the giant fiber to dorsal longitudinal muscle (GF-DLM) connection to 20 ± 13.9% for MII; 26 ± 13.7% for AuIB, 12 ± 9.9% for BuIA, 30 ± 11.3% for EI, 1 ± 1% for PeIA, and 34 ± 15.4% for ImI. Through bioassay-guided fractionation of the venom of Conus brunneus, we found BruIB, an α-conotoxin that inhibits Drosophila nicotinic receptors but not its vertebrate counterparts. GF-DLM responses decreased to 43.7 ± 8.02% on injection of 45 pmol/fly of BruIB. We manipulated the Dα7 nAChR to mimic the selectivity of its vertebrate counterpart by placing structurally guided point mutations in the conotoxin-binding site. This manipulation rendered vertebrate-like behavior in the Drosophila system, enhancing the suitability of Drosophila as an in vivo tool to carry out studies related to human neuronal diseases. .
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Affiliation(s)
- Mari D Heghinian
- *Department of Chemistry and Biochemistry and Department of Biological Sciences, Florida Atlantic University, Boca Raton, Florida, USA; and Health Innovations Research Institute, RMIT University, Melbourne, Victoria, Australia
| | - Monica Mejia
- *Department of Chemistry and Biochemistry and Department of Biological Sciences, Florida Atlantic University, Boca Raton, Florida, USA; and Health Innovations Research Institute, RMIT University, Melbourne, Victoria, Australia
| | - David J Adams
- *Department of Chemistry and Biochemistry and Department of Biological Sciences, Florida Atlantic University, Boca Raton, Florida, USA; and Health Innovations Research Institute, RMIT University, Melbourne, Victoria, Australia
| | - Tanja A Godenschwege
- *Department of Chemistry and Biochemistry and Department of Biological Sciences, Florida Atlantic University, Boca Raton, Florida, USA; and Health Innovations Research Institute, RMIT University, Melbourne, Victoria, Australia
| | - Frank Marí
- *Department of Chemistry and Biochemistry and Department of Biological Sciences, Florida Atlantic University, Boca Raton, Florida, USA; and Health Innovations Research Institute, RMIT University, Melbourne, Victoria, Australia
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