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Wasilewicz LJ, Gagnon ZE, Jung J, Mercier AJ. Investigating postsynaptic effects of a Drosophila neuropeptide on muscle contraction. J Neurophysiol 2024; 131:137-151. [PMID: 38150542 DOI: 10.1152/jn.00246.2023] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/20/2023] [Revised: 11/20/2023] [Accepted: 12/20/2023] [Indexed: 12/29/2023] Open
Abstract
The Drosophila neuropeptide, DPKQDFMRFamide, was previously shown to enhance excitatory junctional potentials (EJPs) and muscle contraction by both presynaptic and postsynaptic actions. Since the peptide acts on both sides of the synaptic cleft, it has been difficult to examine postsynaptic modulatory mechanisms, particularly when contractions are elicited by nerve stimulation. Here, postsynaptic actions are examined in 3rd instar larvae by applying peptide and the excitatory neurotransmitter, l-glutamate, in the bathing solution to elicit contractions after silencing motor output by removing the central nervous system (CNS). DPKQDFMRFamide enhanced glutamate-evoked contractions at low concentrations (EC50 1.3 nM), consistent with its role as a neurohormone, and the combined effect of both substances was supra-additive. Glutamate-evoked contractions were also enhanced when transmitter release was blocked in temperature-sensitive (Shibire) mutants, confirming the peptide's postsynaptic action. The peptide increased membrane depolarization in muscle when co-applied with glutamate, and its effects were blocked by nifedipine, an L-type channel blocker, indicating effects at the plasma membrane involving calcium influx. DPKQDFMRFamide also enhanced contractions induced by caffeine in the absence of extracellular calcium, suggesting increased calcium release from the sarcoplasmic reticulum (SR) or effects downstream of calcium release from the SR. The peptide's effects do not appear to involve calcium/calmodulin-dependent protein kinase II (CaMKII), previously shown to mediate presynaptic effects. The approach used here might be useful for examining postsynaptic effects of neurohormones and cotransmitters in other systems.NEW & NOTEWORTHY Distinguishing presynaptic and postsynaptic effects of neurohormones is a long-standing challenge in many model organisms. Here, postsynaptic actions of DPKQDFMRFamide are demonstrated by assessing its ability to potentiate contractions elicited by direct application of the neurotransmitter, glutamate, when axons are silent and when transmitter release is blocked. The peptide acts at multiple sites to increase contraction, increasing glutamate-induced depolarization at the cell membrane, acting on L-type channels, and acting downstream of calcium release from the sarcoplasmic reticulum.
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Affiliation(s)
- Lucas J Wasilewicz
- Department of Biological Sciences, Brock University, St. Catharines, Ontario, Canada
| | - Zoe E Gagnon
- Department of Biological Sciences, Brock University, St. Catharines, Ontario, Canada
| | - JaeHwan Jung
- Department of Biological Sciences, Brock University, St. Catharines, Ontario, Canada
| | - A Joffre Mercier
- Department of Biological Sciences, Brock University, St. Catharines, Ontario, Canada
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2
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Ehrhardt E, Whitehead SC, Namiki S, Minegishi R, Siwanowicz I, Feng K, Otsuna H, Meissner GW, Stern D, Truman J, Shepherd D, Dickinson MH, Ito K, Dickson BJ, Cohen I, Card GM, Korff W. Single-cell type analysis of wing premotor circuits in the ventral nerve cord of Drosophila melanogaster. BIORXIV : THE PREPRINT SERVER FOR BIOLOGY 2023:2023.05.31.542897. [PMID: 37398009 PMCID: PMC10312520 DOI: 10.1101/2023.05.31.542897] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 07/04/2023]
Abstract
To perform most behaviors, animals must send commands from higher-order processing centers in the brain to premotor circuits that reside in ganglia distinct from the brain, such as the mammalian spinal cord or insect ventral nerve cord. How these circuits are functionally organized to generate the great diversity of animal behavior remains unclear. An important first step in unraveling the organization of premotor circuits is to identify their constituent cell types and create tools to monitor and manipulate these with high specificity to assess their function. This is possible in the tractable ventral nerve cord of the fly. To generate such a toolkit, we used a combinatorial genetic technique (split-GAL4) to create 195 sparse driver lines targeting 198 individual cell types in the ventral nerve cord. These included wing and haltere motoneurons, modulatory neurons, and interneurons. Using a combination of behavioral, developmental, and anatomical analyses, we systematically characterized the cell types targeted in our collection. Taken together, the resources and results presented here form a powerful toolkit for future investigations of neural circuits and connectivity of premotor circuits while linking them to behavioral outputs.
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Affiliation(s)
- Erica Ehrhardt
- Janelia Research Campus, Howard Hughes Medical Institute, 19700 Helix Dr, Ashburn, Virginia 20147, USA
- Institute of Zoology, University of Cologne, Zülpicher Str 47b, 50674 Cologne, Germany
| | - Samuel C Whitehead
- Physics Department, Cornell University, 271 Clark Hall, Ithaca, New York 14853, USA
| | - Shigehiro Namiki
- Janelia Research Campus, Howard Hughes Medical Institute, 19700 Helix Dr, Ashburn, Virginia 20147, USA
| | - Ryo Minegishi
- Janelia Research Campus, Howard Hughes Medical Institute, 19700 Helix Dr, Ashburn, Virginia 20147, USA
| | - Igor Siwanowicz
- Janelia Research Campus, Howard Hughes Medical Institute, 19700 Helix Dr, Ashburn, Virginia 20147, USA
| | - Kai Feng
- Janelia Research Campus, Howard Hughes Medical Institute, 19700 Helix Dr, Ashburn, Virginia 20147, USA
- Queensland Brain Institute, University of Queensland, 79 Upland Rd, Brisbane, QLD, 4072, Australia
| | - Hideo Otsuna
- Janelia Research Campus, Howard Hughes Medical Institute, 19700 Helix Dr, Ashburn, Virginia 20147, USA
| | - FlyLight Project Team
- Janelia Research Campus, Howard Hughes Medical Institute, 19700 Helix Dr, Ashburn, Virginia 20147, USA
| | - Geoffrey W Meissner
- Janelia Research Campus, Howard Hughes Medical Institute, 19700 Helix Dr, Ashburn, Virginia 20147, USA
| | - David Stern
- Janelia Research Campus, Howard Hughes Medical Institute, 19700 Helix Dr, Ashburn, Virginia 20147, USA
| | - Jim Truman
- Janelia Research Campus, Howard Hughes Medical Institute, 19700 Helix Dr, Ashburn, Virginia 20147, USA
- Department of Biology, University of Washington, Seattle, Washington 98195, USA
| | - David Shepherd
- School of Biological Sciences, Faculty of Environmental and Life Sciences, University of Southampton, Life Sciences Building, Southampton SO17 1BJ
| | - Michael H. Dickinson
- Janelia Research Campus, Howard Hughes Medical Institute, 19700 Helix Dr, Ashburn, Virginia 20147, USA
- California Institute of Technology, 1200 E California Blvd, Pasadena, California 91125, USA
| | - Kei Ito
- Janelia Research Campus, Howard Hughes Medical Institute, 19700 Helix Dr, Ashburn, Virginia 20147, USA
- Institute of Zoology, University of Cologne, Zülpicher Str 47b, 50674 Cologne, Germany
| | - Barry J Dickson
- Janelia Research Campus, Howard Hughes Medical Institute, 19700 Helix Dr, Ashburn, Virginia 20147, USA
| | - Itai Cohen
- Physics Department, Cornell University, 271 Clark Hall, Ithaca, New York 14853, USA
| | - Gwyneth M Card
- Janelia Research Campus, Howard Hughes Medical Institute, 19700 Helix Dr, Ashburn, Virginia 20147, USA
| | - Wyatt Korff
- Janelia Research Campus, Howard Hughes Medical Institute, 19700 Helix Dr, Ashburn, Virginia 20147, USA
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Corrêa EJA, Carvalho FC, de Castro Oliveira JA, Bertolucci SKV, Scotti MT, Silveira CH, Guedes FC, Melo JOF, de Melo-Minardi RC, de Lima LHF. Elucidating the molecular mechanisms of essential oils' insecticidal action using a novel cheminformatics protocol. Sci Rep 2023; 13:4598. [PMID: 36944648 PMCID: PMC10028760 DOI: 10.1038/s41598-023-29981-3] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/31/2022] [Accepted: 02/14/2023] [Indexed: 03/23/2023] Open
Abstract
Essential oils (EOs) are a promising source for novel environmentally safe insecticides. However, the structural diversity of their compounds poses challenges to accurately elucidate their biological mechanisms of action. We present a new chemoinformatics methodology aimed at predicting the impact of essential oil (EO) compounds on the molecular targets of commercial insecticides. Our approach merges virtual screening, chemoinformatics, and machine learning to identify custom signatures and reference molecule clusters. By assigning a molecule to a cluster, we can determine its most likely interaction targets. Our findings reveal that the main targets of EOs are juvenile hormone-specific proteins (JHBP and MET) and octopamine receptor agonists (OctpRago). Three of the twenty clusters show strong similarities to the juvenile hormone, steroids, and biogenic amines. For instance, the methodology successfully identified E-Nerolidol, for which literature points indications of disrupting insect metamorphosis and neurochemistry, as a potential insecticide in these pathways. We validated the predictions through experimental bioassays, observing symptoms in blowflies that were consistent with the computational results. This new approach sheds a higher light on the ways of action of EO compounds in nature and biotechnology. It also opens new possibilities for understanding how molecules can interfere with biological systems and has broad implications for areas such as drug design.
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Affiliation(s)
- Eduardo José Azevedo Corrêa
- Multicenter Program in Postgraduate in Biochemistry and Molecular Biology, Federal University of São João del-Rei, Campus Divinópolis, Divinópolis, MG, Brazil
- Minas Gerais Agricultural Research Company (EPAMIG), Pitangui, MG, Brazil
| | - Frederico Chaves Carvalho
- Department of Computer Science, Institute of Exact Sciences-ICEx, Federal University of Minas Gerais, Campus Belo Horizonte, Belo Horizonte, MG, Brazil
| | | | - Suzan Kelly Vilela Bertolucci
- Laboratory of Phytochemistry and Medicinal Plants, Department of Agriculture, Federal University of Lavras, Lavras, MG, Brazil
| | - Marcus Tullius Scotti
- Chemistry Department, Exact and Nature Sciences Center, Federal University of Paraiba, Campus I, João Pessoa, PB, Brazil
| | | | - Fabiana Costa Guedes
- Technological Sciences Institute, Federal University of Itajubá, Itabira, MG, Brazil
| | - Júlio Onésio Ferreira Melo
- Department of Exact and Biological Sciences, Federal University of São João Del-Rei, Sete Lagoas Campus, Sete Lagoas, MG, Brazil
| | - Raquel Cardoso de Melo-Minardi
- Department of Computer Science, Institute of Exact Sciences-ICEx, Federal University of Minas Gerais, Campus Belo Horizonte, Belo Horizonte, MG, Brazil
| | - Leonardo Henrique França de Lima
- Multicenter Program in Postgraduate in Biochemistry and Molecular Biology, Federal University of São João del-Rei, Campus Divinópolis, Divinópolis, MG, Brazil.
- Department of Exact and Biological Sciences, Federal University of São João Del-Rei, Sete Lagoas Campus, Sete Lagoas, MG, Brazil.
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Barreto YC, Oliveira RS, Borges BT, Rosa ME, Zanatta AP, de Almeida CGM, Vinadé L, Carlini CR, Belo CAD. The neurotoxic mechanism of Jack Bean Urease in insects involves the interplay between octopaminergic and dopaminergic pathways. PESTICIDE BIOCHEMISTRY AND PHYSIOLOGY 2023; 189:105290. [PMID: 36549826 DOI: 10.1016/j.pestbp.2022.105290] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/10/2022] [Revised: 11/06/2022] [Accepted: 11/09/2022] [Indexed: 06/17/2023]
Abstract
In the last decades, the entomotoxicity of JBU and its derived peptides became an object of study, due mainly to the ubiquitous interaction of these compounds with different species of insects and their potential as natural insecticides. In this work, we investigated the neurotoxic effects of JBU in Nauphoeta cinerea cockroaches by dissecting pharmacologically the monoaminergic pathways involved. Selective pharmacological modulators for monoaminergic pathways in in vivo and ex vivo experimental models were employed. Thus, the analysis of N. cinerea neurolocomotory behavior demonstrated that JBU (1.5 and 3 μg/g) induces a significant decrease in the exploratory activity. In these assays, pretreatment of animals with phentolamine, SCH23390 or reserpine, interfered significantly with the response of JBU. Using in vivo abductor metathoracic preparations JBU (1.5 μg/g) induced progressive neuromuscular blockade, in 120 min recordings. In this set of experiments, the previous treatment of the animals with phentolamine, SCH23390 or reserpine, completely inhibited JBU-induced neuromuscular blockade. The recordings of spontaneous compound neural action potentials in N. cinerea legs showed that JBU, only in the smallest dose, significantly decreased the number of potentials in 60 min recordings. When the animals were pretreated with phentolamine, SCH23390, or reserpine, but not with mianserin, there was a significant prevention of the JBU-inhibitory responses on the action potentials firing. Meanwhile, the treatment of the animals with mianserin did not affect JBU's inhibitory activity. The data presented in this work strongly suggest that the neurotoxic response of JBU in N. cinerea involves a cross talking between OCTOPAMIN-ergic and DOPAMIN-ergic nerve systems, but not the SEROTONIN-ergic neurotransmission. Further molecular biology studies with expression of insect receptors associated with voltage clamp techniques will help to discriminate the selectivity of JBU over the monoaminergic transmission.
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Affiliation(s)
- Yuri Correia Barreto
- Laboratório de Neurobiologia e Toxinologia (LANETOX), Universidade Federal do Pampa, Campus São Gabriel, São Gabriel, RS, Brazil
| | - Raquel Soares Oliveira
- Laboratório de Neurobiologia e Toxinologia (LANETOX), Universidade Federal do Pampa, Campus São Gabriel, São Gabriel, RS, Brazil
| | - Bruna Trindade Borges
- Laboratório de Neurobiologia e Toxinologia (LANETOX), Universidade Federal do Pampa, Campus São Gabriel, São Gabriel, RS, Brazil
| | - Maria Eduarda Rosa
- Laboratório de Neurobiologia e Toxinologia (LANETOX), Universidade Federal do Pampa, Campus São Gabriel, São Gabriel, RS, Brazil
| | - Ana Paula Zanatta
- Laboratório de Neurobiologia e Toxinologia (LANETOX), Universidade Federal do Pampa, Campus São Gabriel, São Gabriel, RS, Brazil
| | - Carlos Gabriel Moreira de Almeida
- Laboratório de Neurobiologia e Toxinologia (LANETOX), Universidade Federal do Pampa, Campus São Gabriel, São Gabriel, RS, Brazil; Programa de Pós-Graduação em Medicina e Ciências da Saúde (PPGMCS), Pontifical Catholic University of Rio Grande do Sul, Porto Alegre, RS, Brazil
| | - Lúcia Vinadé
- Laboratório de Neurobiologia e Toxinologia (LANETOX), Universidade Federal do Pampa, Campus São Gabriel, São Gabriel, RS, Brazil
| | - Celia Regina Carlini
- Brain Institute of Rio Grande do Sul (INSCER), Pontifícia Universidade Católica do Rio Grande de Sul, Porto Alegre, RS, Brazil
| | - Cháriston André Dal Belo
- Laboratório de Neurobiologia e Toxinologia (LANETOX), Universidade Federal do Pampa, Campus São Gabriel, São Gabriel, RS, Brazil; Programa de Pós-Graduação em Ciências Biológicas: Bioquímica Toxicológica (PPGBTox), Universidade Federal de Santa Maria (UFSM), Santa Maria, RS, Brazil; Departamento Multidisciplinar, Escola Paulista de Política, Economia e Negócios (EPPEN), Universidade Federal de São Paulo (UNIFESP), Rua Angélica, 100, Jardim das Flores, 06110295, Osasco, SP, Brazil.
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Ormerod KG, Scibelli AE, Littleton JT. Regulation of excitation-contraction coupling at the Drosophila neuromuscular junction. J Physiol 2021; 600:349-372. [PMID: 34788476 DOI: 10.1113/jp282092] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/28/2021] [Accepted: 10/28/2021] [Indexed: 01/05/2023] Open
Abstract
The Drosophila neuromuscular system is widely used to characterize synaptic development and function. However, little is known about how specific synaptic alterations effect neuromuscular transduction and muscle contractility, which ultimately dictate behavioural output. Here we develop and use a force transducer system to characterize excitation-contraction coupling at Drosophila larval neuromuscular junctions (NMJs), examining how specific neuronal and muscle manipulations disrupt muscle contractility. Muscle contraction force increased with motoneuron stimulation frequency and duration, showing considerable plasticity between 5 and 40 Hz and saturating above 50 Hz. Endogenous recordings of fictive contractions revealed average motoneuron burst frequencies of 20-30 Hz, consistent with the system operating within this plastic range of contractility. Temperature was also a key factor in muscle contractility, as force was enhanced at lower temperatures and dramatically reduced with increasing temperatures. Pharmacological and genetic manipulations of critical components of Ca2+ regulation in both pre- and postsynaptic compartments affected the strength and time course of muscle contractions. A screen for modulators of muscle contractility led to identification and characterization of the molecular and cellular pathway by which the FMRFa peptide, TPAEDFMRFa, increases muscle performance. These findings indicate Drosophila NMJs provide a robust system to correlate synaptic dysfunction, regulation and modulation to alterations in excitation-contraction coupling. KEY POINTS: Larval muscle contraction force increases with stimulation frequency and duration, revealing substantial plasticity between 5 and 40 Hz. Fictive contraction recordings demonstrate endogenous motoneuron burst frequencies consistent with the neuromuscular system operating within the range of greatest plasticity. Genetic and pharmacological manipulations of critical components of pre- and postsynaptic Ca2+ regulation significantly affect the strength and time course of muscle contractions. A screen for modulators of the excitation-contraction machinery identified a FMRFa peptide, TPAEDFMRFa and its associated signalling pathway, that dramatically increases muscle performance. Drosophila serves as an excellent model for dissecting components of the excitation-contraction coupling machinery.
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Affiliation(s)
- Kiel G Ormerod
- The Picower Institute for Learning and Memory, Department of Biology, Department of Brain and Cognitive Sciences, Massachusetts Institute of Technology, Cambridge, MA, USA
| | | | - J Troy Littleton
- The Picower Institute for Learning and Memory, Department of Biology, Department of Brain and Cognitive Sciences, Massachusetts Institute of Technology, Cambridge, MA, USA
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Gyimesi M, Rauscher AÁ, Suthar SK, Hamow KÁ, Oravecz K, Lőrincz I, Borhegyi Z, Déri MT, Kiss ÁF, Monostory K, Szabó PT, Nag S, Tomasic I, Krans J, Tierney PJ, Kovács M, Kornya L, Málnási-Csizmadia A. Improved Inhibitory and Absorption, Distribution, Metabolism, Excretion, and Toxicology (ADMET) Properties of Blebbistatin Derivatives Indicate That Blebbistatin Scaffold Is Ideal for drug Development Targeting Myosin-2. J Pharmacol Exp Ther 2021; 376:358-373. [PMID: 33468641 DOI: 10.1124/jpet.120.000167] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/15/2020] [Accepted: 10/07/2020] [Indexed: 11/22/2022] Open
Abstract
Blebbistatin, para-nitroblebbistatin (NBleb), and para-aminoblebbistatin (AmBleb) are highly useful tool compounds as they selectively inhibit the ATPase activity of myosin-2 family proteins. Despite the medical importance of the myosin-2 family as drug targets, chemical optimization has not yet provided a promising lead for drug development because previous structure-activity-relationship studies were limited to a single myosin-2 isoform. Here we evaluated the potential of blebbistatin scaffold for drug development and found that D-ring substitutions can fine-tune isoform specificity, absorption-distribution-metabolism-excretion, and toxicological properties. We defined the inhibitory properties of NBleb and AmBleb on seven different myosin-2 isoforms, which revealed an unexpected potential for isoform specific inhibition. We also found that NBleb metabolizes six times slower than blebbistatin and AmBleb in rats, whereas AmBleb metabolizes two times slower than blebbistatin and NBleb in human, and that AmBleb accumulates in muscle tissues. Moreover, mutagenicity was also greatly reduced in case of AmBleb. These results demonstrate that small substitutions have beneficial functional and pharmacological consequences, which highlight the potential of the blebbistatin scaffold for drug development targeting myosin-2 family proteins and delineate a route for defining the chemical properties of further derivatives to be developed. SIGNIFICANCE STATEMENT: Small substitutions on the blebbistatin scaffold have beneficial functional and pharmacological consequences, highlighting their potential in drug development targeting myosin-2 family proteins.
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Affiliation(s)
- Máté Gyimesi
- Department of Biochemistry, Eötvös Loránd University, Budapest and Martonvásár, Hungary (M.G., K.O., I.L., Z.B., M.K., A.M.-C.); MTA-ELTE Motor Pharmacology Research Group, Budapest, Hungary (M.G., M.K., A.M.-C.); Motorharma Ltd., Budapest, Hungary (A.Á.R.); Printnet Ltd., Budapest, Hungary (S.K.S., I.L.); Plant Protection Institute, Centre for Agricultural Research, Martonvásár, Hungary (K.Á.H.); Metabolic Drug Interactions Research Group, Institute of Enzymology, Research Centre for Natural Sciences, Budapest, Hungary (M.T.D., Á.F.K., K.M.); Research Centre for Natural Sciences, Instrumentation Center, MS Metabolomic Research Laboratory, Budapest, Hungary (P.T.S.); Department of Biology, MyoKardia Inc., Brisbane, California (S.N., I.T.); Department of Neuroscience, Western New England University, Springfield, Massachusetts (J.K., P.J.T.); and Central Hospital of Southern Pest, National Institute of Hematology and Infectious Diseases, Budapest, Hungary (L.K.)
| | - Anna Á Rauscher
- Department of Biochemistry, Eötvös Loránd University, Budapest and Martonvásár, Hungary (M.G., K.O., I.L., Z.B., M.K., A.M.-C.); MTA-ELTE Motor Pharmacology Research Group, Budapest, Hungary (M.G., M.K., A.M.-C.); Motorharma Ltd., Budapest, Hungary (A.Á.R.); Printnet Ltd., Budapest, Hungary (S.K.S., I.L.); Plant Protection Institute, Centre for Agricultural Research, Martonvásár, Hungary (K.Á.H.); Metabolic Drug Interactions Research Group, Institute of Enzymology, Research Centre for Natural Sciences, Budapest, Hungary (M.T.D., Á.F.K., K.M.); Research Centre for Natural Sciences, Instrumentation Center, MS Metabolomic Research Laboratory, Budapest, Hungary (P.T.S.); Department of Biology, MyoKardia Inc., Brisbane, California (S.N., I.T.); Department of Neuroscience, Western New England University, Springfield, Massachusetts (J.K., P.J.T.); and Central Hospital of Southern Pest, National Institute of Hematology and Infectious Diseases, Budapest, Hungary (L.K.)
| | - Sharad Kumar Suthar
- Department of Biochemistry, Eötvös Loránd University, Budapest and Martonvásár, Hungary (M.G., K.O., I.L., Z.B., M.K., A.M.-C.); MTA-ELTE Motor Pharmacology Research Group, Budapest, Hungary (M.G., M.K., A.M.-C.); Motorharma Ltd., Budapest, Hungary (A.Á.R.); Printnet Ltd., Budapest, Hungary (S.K.S., I.L.); Plant Protection Institute, Centre for Agricultural Research, Martonvásár, Hungary (K.Á.H.); Metabolic Drug Interactions Research Group, Institute of Enzymology, Research Centre for Natural Sciences, Budapest, Hungary (M.T.D., Á.F.K., K.M.); Research Centre for Natural Sciences, Instrumentation Center, MS Metabolomic Research Laboratory, Budapest, Hungary (P.T.S.); Department of Biology, MyoKardia Inc., Brisbane, California (S.N., I.T.); Department of Neuroscience, Western New England University, Springfield, Massachusetts (J.K., P.J.T.); and Central Hospital of Southern Pest, National Institute of Hematology and Infectious Diseases, Budapest, Hungary (L.K.)
| | - Kamirán Á Hamow
- Department of Biochemistry, Eötvös Loránd University, Budapest and Martonvásár, Hungary (M.G., K.O., I.L., Z.B., M.K., A.M.-C.); MTA-ELTE Motor Pharmacology Research Group, Budapest, Hungary (M.G., M.K., A.M.-C.); Motorharma Ltd., Budapest, Hungary (A.Á.R.); Printnet Ltd., Budapest, Hungary (S.K.S., I.L.); Plant Protection Institute, Centre for Agricultural Research, Martonvásár, Hungary (K.Á.H.); Metabolic Drug Interactions Research Group, Institute of Enzymology, Research Centre for Natural Sciences, Budapest, Hungary (M.T.D., Á.F.K., K.M.); Research Centre for Natural Sciences, Instrumentation Center, MS Metabolomic Research Laboratory, Budapest, Hungary (P.T.S.); Department of Biology, MyoKardia Inc., Brisbane, California (S.N., I.T.); Department of Neuroscience, Western New England University, Springfield, Massachusetts (J.K., P.J.T.); and Central Hospital of Southern Pest, National Institute of Hematology and Infectious Diseases, Budapest, Hungary (L.K.)
| | - Kinga Oravecz
- Department of Biochemistry, Eötvös Loránd University, Budapest and Martonvásár, Hungary (M.G., K.O., I.L., Z.B., M.K., A.M.-C.); MTA-ELTE Motor Pharmacology Research Group, Budapest, Hungary (M.G., M.K., A.M.-C.); Motorharma Ltd., Budapest, Hungary (A.Á.R.); Printnet Ltd., Budapest, Hungary (S.K.S., I.L.); Plant Protection Institute, Centre for Agricultural Research, Martonvásár, Hungary (K.Á.H.); Metabolic Drug Interactions Research Group, Institute of Enzymology, Research Centre for Natural Sciences, Budapest, Hungary (M.T.D., Á.F.K., K.M.); Research Centre for Natural Sciences, Instrumentation Center, MS Metabolomic Research Laboratory, Budapest, Hungary (P.T.S.); Department of Biology, MyoKardia Inc., Brisbane, California (S.N., I.T.); Department of Neuroscience, Western New England University, Springfield, Massachusetts (J.K., P.J.T.); and Central Hospital of Southern Pest, National Institute of Hematology and Infectious Diseases, Budapest, Hungary (L.K.)
| | - István Lőrincz
- Department of Biochemistry, Eötvös Loránd University, Budapest and Martonvásár, Hungary (M.G., K.O., I.L., Z.B., M.K., A.M.-C.); MTA-ELTE Motor Pharmacology Research Group, Budapest, Hungary (M.G., M.K., A.M.-C.); Motorharma Ltd., Budapest, Hungary (A.Á.R.); Printnet Ltd., Budapest, Hungary (S.K.S., I.L.); Plant Protection Institute, Centre for Agricultural Research, Martonvásár, Hungary (K.Á.H.); Metabolic Drug Interactions Research Group, Institute of Enzymology, Research Centre for Natural Sciences, Budapest, Hungary (M.T.D., Á.F.K., K.M.); Research Centre for Natural Sciences, Instrumentation Center, MS Metabolomic Research Laboratory, Budapest, Hungary (P.T.S.); Department of Biology, MyoKardia Inc., Brisbane, California (S.N., I.T.); Department of Neuroscience, Western New England University, Springfield, Massachusetts (J.K., P.J.T.); and Central Hospital of Southern Pest, National Institute of Hematology and Infectious Diseases, Budapest, Hungary (L.K.)
| | - Zsolt Borhegyi
- Department of Biochemistry, Eötvös Loránd University, Budapest and Martonvásár, Hungary (M.G., K.O., I.L., Z.B., M.K., A.M.-C.); MTA-ELTE Motor Pharmacology Research Group, Budapest, Hungary (M.G., M.K., A.M.-C.); Motorharma Ltd., Budapest, Hungary (A.Á.R.); Printnet Ltd., Budapest, Hungary (S.K.S., I.L.); Plant Protection Institute, Centre for Agricultural Research, Martonvásár, Hungary (K.Á.H.); Metabolic Drug Interactions Research Group, Institute of Enzymology, Research Centre for Natural Sciences, Budapest, Hungary (M.T.D., Á.F.K., K.M.); Research Centre for Natural Sciences, Instrumentation Center, MS Metabolomic Research Laboratory, Budapest, Hungary (P.T.S.); Department of Biology, MyoKardia Inc., Brisbane, California (S.N., I.T.); Department of Neuroscience, Western New England University, Springfield, Massachusetts (J.K., P.J.T.); and Central Hospital of Southern Pest, National Institute of Hematology and Infectious Diseases, Budapest, Hungary (L.K.)
| | - Máté T Déri
- Department of Biochemistry, Eötvös Loránd University, Budapest and Martonvásár, Hungary (M.G., K.O., I.L., Z.B., M.K., A.M.-C.); MTA-ELTE Motor Pharmacology Research Group, Budapest, Hungary (M.G., M.K., A.M.-C.); Motorharma Ltd., Budapest, Hungary (A.Á.R.); Printnet Ltd., Budapest, Hungary (S.K.S., I.L.); Plant Protection Institute, Centre for Agricultural Research, Martonvásár, Hungary (K.Á.H.); Metabolic Drug Interactions Research Group, Institute of Enzymology, Research Centre for Natural Sciences, Budapest, Hungary (M.T.D., Á.F.K., K.M.); Research Centre for Natural Sciences, Instrumentation Center, MS Metabolomic Research Laboratory, Budapest, Hungary (P.T.S.); Department of Biology, MyoKardia Inc., Brisbane, California (S.N., I.T.); Department of Neuroscience, Western New England University, Springfield, Massachusetts (J.K., P.J.T.); and Central Hospital of Southern Pest, National Institute of Hematology and Infectious Diseases, Budapest, Hungary (L.K.)
| | - Ádám F Kiss
- Department of Biochemistry, Eötvös Loránd University, Budapest and Martonvásár, Hungary (M.G., K.O., I.L., Z.B., M.K., A.M.-C.); MTA-ELTE Motor Pharmacology Research Group, Budapest, Hungary (M.G., M.K., A.M.-C.); Motorharma Ltd., Budapest, Hungary (A.Á.R.); Printnet Ltd., Budapest, Hungary (S.K.S., I.L.); Plant Protection Institute, Centre for Agricultural Research, Martonvásár, Hungary (K.Á.H.); Metabolic Drug Interactions Research Group, Institute of Enzymology, Research Centre for Natural Sciences, Budapest, Hungary (M.T.D., Á.F.K., K.M.); Research Centre for Natural Sciences, Instrumentation Center, MS Metabolomic Research Laboratory, Budapest, Hungary (P.T.S.); Department of Biology, MyoKardia Inc., Brisbane, California (S.N., I.T.); Department of Neuroscience, Western New England University, Springfield, Massachusetts (J.K., P.J.T.); and Central Hospital of Southern Pest, National Institute of Hematology and Infectious Diseases, Budapest, Hungary (L.K.)
| | - Katalin Monostory
- Department of Biochemistry, Eötvös Loránd University, Budapest and Martonvásár, Hungary (M.G., K.O., I.L., Z.B., M.K., A.M.-C.); MTA-ELTE Motor Pharmacology Research Group, Budapest, Hungary (M.G., M.K., A.M.-C.); Motorharma Ltd., Budapest, Hungary (A.Á.R.); Printnet Ltd., Budapest, Hungary (S.K.S., I.L.); Plant Protection Institute, Centre for Agricultural Research, Martonvásár, Hungary (K.Á.H.); Metabolic Drug Interactions Research Group, Institute of Enzymology, Research Centre for Natural Sciences, Budapest, Hungary (M.T.D., Á.F.K., K.M.); Research Centre for Natural Sciences, Instrumentation Center, MS Metabolomic Research Laboratory, Budapest, Hungary (P.T.S.); Department of Biology, MyoKardia Inc., Brisbane, California (S.N., I.T.); Department of Neuroscience, Western New England University, Springfield, Massachusetts (J.K., P.J.T.); and Central Hospital of Southern Pest, National Institute of Hematology and Infectious Diseases, Budapest, Hungary (L.K.)
| | - Pál Tamás Szabó
- Department of Biochemistry, Eötvös Loránd University, Budapest and Martonvásár, Hungary (M.G., K.O., I.L., Z.B., M.K., A.M.-C.); MTA-ELTE Motor Pharmacology Research Group, Budapest, Hungary (M.G., M.K., A.M.-C.); Motorharma Ltd., Budapest, Hungary (A.Á.R.); Printnet Ltd., Budapest, Hungary (S.K.S., I.L.); Plant Protection Institute, Centre for Agricultural Research, Martonvásár, Hungary (K.Á.H.); Metabolic Drug Interactions Research Group, Institute of Enzymology, Research Centre for Natural Sciences, Budapest, Hungary (M.T.D., Á.F.K., K.M.); Research Centre for Natural Sciences, Instrumentation Center, MS Metabolomic Research Laboratory, Budapest, Hungary (P.T.S.); Department of Biology, MyoKardia Inc., Brisbane, California (S.N., I.T.); Department of Neuroscience, Western New England University, Springfield, Massachusetts (J.K., P.J.T.); and Central Hospital of Southern Pest, National Institute of Hematology and Infectious Diseases, Budapest, Hungary (L.K.)
| | - Suman Nag
- Department of Biochemistry, Eötvös Loránd University, Budapest and Martonvásár, Hungary (M.G., K.O., I.L., Z.B., M.K., A.M.-C.); MTA-ELTE Motor Pharmacology Research Group, Budapest, Hungary (M.G., M.K., A.M.-C.); Motorharma Ltd., Budapest, Hungary (A.Á.R.); Printnet Ltd., Budapest, Hungary (S.K.S., I.L.); Plant Protection Institute, Centre for Agricultural Research, Martonvásár, Hungary (K.Á.H.); Metabolic Drug Interactions Research Group, Institute of Enzymology, Research Centre for Natural Sciences, Budapest, Hungary (M.T.D., Á.F.K., K.M.); Research Centre for Natural Sciences, Instrumentation Center, MS Metabolomic Research Laboratory, Budapest, Hungary (P.T.S.); Department of Biology, MyoKardia Inc., Brisbane, California (S.N., I.T.); Department of Neuroscience, Western New England University, Springfield, Massachusetts (J.K., P.J.T.); and Central Hospital of Southern Pest, National Institute of Hematology and Infectious Diseases, Budapest, Hungary (L.K.)
| | - Ivan Tomasic
- Department of Biochemistry, Eötvös Loránd University, Budapest and Martonvásár, Hungary (M.G., K.O., I.L., Z.B., M.K., A.M.-C.); MTA-ELTE Motor Pharmacology Research Group, Budapest, Hungary (M.G., M.K., A.M.-C.); Motorharma Ltd., Budapest, Hungary (A.Á.R.); Printnet Ltd., Budapest, Hungary (S.K.S., I.L.); Plant Protection Institute, Centre for Agricultural Research, Martonvásár, Hungary (K.Á.H.); Metabolic Drug Interactions Research Group, Institute of Enzymology, Research Centre for Natural Sciences, Budapest, Hungary (M.T.D., Á.F.K., K.M.); Research Centre for Natural Sciences, Instrumentation Center, MS Metabolomic Research Laboratory, Budapest, Hungary (P.T.S.); Department of Biology, MyoKardia Inc., Brisbane, California (S.N., I.T.); Department of Neuroscience, Western New England University, Springfield, Massachusetts (J.K., P.J.T.); and Central Hospital of Southern Pest, National Institute of Hematology and Infectious Diseases, Budapest, Hungary (L.K.)
| | - Jacob Krans
- Department of Biochemistry, Eötvös Loránd University, Budapest and Martonvásár, Hungary (M.G., K.O., I.L., Z.B., M.K., A.M.-C.); MTA-ELTE Motor Pharmacology Research Group, Budapest, Hungary (M.G., M.K., A.M.-C.); Motorharma Ltd., Budapest, Hungary (A.Á.R.); Printnet Ltd., Budapest, Hungary (S.K.S., I.L.); Plant Protection Institute, Centre for Agricultural Research, Martonvásár, Hungary (K.Á.H.); Metabolic Drug Interactions Research Group, Institute of Enzymology, Research Centre for Natural Sciences, Budapest, Hungary (M.T.D., Á.F.K., K.M.); Research Centre for Natural Sciences, Instrumentation Center, MS Metabolomic Research Laboratory, Budapest, Hungary (P.T.S.); Department of Biology, MyoKardia Inc., Brisbane, California (S.N., I.T.); Department of Neuroscience, Western New England University, Springfield, Massachusetts (J.K., P.J.T.); and Central Hospital of Southern Pest, National Institute of Hematology and Infectious Diseases, Budapest, Hungary (L.K.)
| | - Patrick J Tierney
- Department of Biochemistry, Eötvös Loránd University, Budapest and Martonvásár, Hungary (M.G., K.O., I.L., Z.B., M.K., A.M.-C.); MTA-ELTE Motor Pharmacology Research Group, Budapest, Hungary (M.G., M.K., A.M.-C.); Motorharma Ltd., Budapest, Hungary (A.Á.R.); Printnet Ltd., Budapest, Hungary (S.K.S., I.L.); Plant Protection Institute, Centre for Agricultural Research, Martonvásár, Hungary (K.Á.H.); Metabolic Drug Interactions Research Group, Institute of Enzymology, Research Centre for Natural Sciences, Budapest, Hungary (M.T.D., Á.F.K., K.M.); Research Centre for Natural Sciences, Instrumentation Center, MS Metabolomic Research Laboratory, Budapest, Hungary (P.T.S.); Department of Biology, MyoKardia Inc., Brisbane, California (S.N., I.T.); Department of Neuroscience, Western New England University, Springfield, Massachusetts (J.K., P.J.T.); and Central Hospital of Southern Pest, National Institute of Hematology and Infectious Diseases, Budapest, Hungary (L.K.)
| | - Mihály Kovács
- Department of Biochemistry, Eötvös Loránd University, Budapest and Martonvásár, Hungary (M.G., K.O., I.L., Z.B., M.K., A.M.-C.); MTA-ELTE Motor Pharmacology Research Group, Budapest, Hungary (M.G., M.K., A.M.-C.); Motorharma Ltd., Budapest, Hungary (A.Á.R.); Printnet Ltd., Budapest, Hungary (S.K.S., I.L.); Plant Protection Institute, Centre for Agricultural Research, Martonvásár, Hungary (K.Á.H.); Metabolic Drug Interactions Research Group, Institute of Enzymology, Research Centre for Natural Sciences, Budapest, Hungary (M.T.D., Á.F.K., K.M.); Research Centre for Natural Sciences, Instrumentation Center, MS Metabolomic Research Laboratory, Budapest, Hungary (P.T.S.); Department of Biology, MyoKardia Inc., Brisbane, California (S.N., I.T.); Department of Neuroscience, Western New England University, Springfield, Massachusetts (J.K., P.J.T.); and Central Hospital of Southern Pest, National Institute of Hematology and Infectious Diseases, Budapest, Hungary (L.K.)
| | - László Kornya
- Department of Biochemistry, Eötvös Loránd University, Budapest and Martonvásár, Hungary (M.G., K.O., I.L., Z.B., M.K., A.M.-C.); MTA-ELTE Motor Pharmacology Research Group, Budapest, Hungary (M.G., M.K., A.M.-C.); Motorharma Ltd., Budapest, Hungary (A.Á.R.); Printnet Ltd., Budapest, Hungary (S.K.S., I.L.); Plant Protection Institute, Centre for Agricultural Research, Martonvásár, Hungary (K.Á.H.); Metabolic Drug Interactions Research Group, Institute of Enzymology, Research Centre for Natural Sciences, Budapest, Hungary (M.T.D., Á.F.K., K.M.); Research Centre for Natural Sciences, Instrumentation Center, MS Metabolomic Research Laboratory, Budapest, Hungary (P.T.S.); Department of Biology, MyoKardia Inc., Brisbane, California (S.N., I.T.); Department of Neuroscience, Western New England University, Springfield, Massachusetts (J.K., P.J.T.); and Central Hospital of Southern Pest, National Institute of Hematology and Infectious Diseases, Budapest, Hungary (L.K.)
| | - András Málnási-Csizmadia
- Department of Biochemistry, Eötvös Loránd University, Budapest and Martonvásár, Hungary (M.G., K.O., I.L., Z.B., M.K., A.M.-C.); MTA-ELTE Motor Pharmacology Research Group, Budapest, Hungary (M.G., M.K., A.M.-C.); Motorharma Ltd., Budapest, Hungary (A.Á.R.); Printnet Ltd., Budapest, Hungary (S.K.S., I.L.); Plant Protection Institute, Centre for Agricultural Research, Martonvásár, Hungary (K.Á.H.); Metabolic Drug Interactions Research Group, Institute of Enzymology, Research Centre for Natural Sciences, Budapest, Hungary (M.T.D., Á.F.K., K.M.); Research Centre for Natural Sciences, Instrumentation Center, MS Metabolomic Research Laboratory, Budapest, Hungary (P.T.S.); Department of Biology, MyoKardia Inc., Brisbane, California (S.N., I.T.); Department of Neuroscience, Western New England University, Springfield, Massachusetts (J.K., P.J.T.); and Central Hospital of Southern Pest, National Institute of Hematology and Infectious Diseases, Budapest, Hungary (L.K.)
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7
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AmOctα2R: Functional Characterization of a Honeybee Octopamine Receptor Inhibiting Adenylyl Cyclase Activity. Int J Mol Sci 2020; 21:ijms21249334. [PMID: 33302363 PMCID: PMC7762591 DOI: 10.3390/ijms21249334] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/14/2020] [Revised: 12/04/2020] [Accepted: 12/06/2020] [Indexed: 11/17/2022] Open
Abstract
The catecholamines norepinephrine and epinephrine are important regulators of vertebrate physiology. Insects such as honeybees do not synthesize these neuroactive substances. Instead, they use the phenolamines tyramine and octopamine for similar physiological functions. These biogenic amines activate specific members of the large protein family of G protein-coupled receptors (GPCRs). Based on molecular and pharmacological data, insect octopamine receptors were classified as either α- or β-adrenergic-like octopamine receptors. Currently, one α- and four β-receptors have been molecularly and pharmacologically characterized in the honeybee. Recently, an α2-adrenergic-like octopamine receptor was identified in Drosophila melanogaster (DmOctα2R). This receptor is activated by octopamine and other biogenic amines and causes a decrease in intracellular cAMP ([cAMP]i). Here, we show that the orthologous receptor of the honeybee (AmOctα2R), phylogenetically groups in a clade closely related to human α2-adrenergic receptors. When heterologously expressed in an eukaryotic cell line, AmOctα2R causes a decrease in [cAMP]i. The receptor displays a pronounced preference for octopamine over tyramine. In contrast to DmOctα2R, the honeybee receptor is not activated by serotonin. Its activity can be blocked efficiently by 5-carboxamidotryptamine and phentolamine. The functional characterization of AmOctα2R now adds a sixth member to this subfamily of monoaminergic receptors in the honeybee and is an important step towards understanding the actions of octopamine in honeybee behavior and physiology.
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8
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Hill AS, Jain P, Folan NE, Ben-Shahar Y. The Drosophila ERG channel seizure plays a role in the neuronal homeostatic stress response. PLoS Genet 2019; 15:e1008288. [PMID: 31393878 PMCID: PMC6687100 DOI: 10.1371/journal.pgen.1008288] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/15/2019] [Accepted: 07/04/2019] [Indexed: 11/24/2022] Open
Abstract
Neuronal physiology is particularly sensitive to acute stressors that affect excitability, many of which can trigger seizures and epilepsies. Although intrinsic neuronal homeostasis plays an important role in maintaining overall nervous system robustness and its resistance to stressors, the specific genetic and molecular mechanisms that underlie these processes are not well understood. Here we used a reverse genetic approach in Drosophila to test the hypothesis that specific voltage-gated ion channels contribute to neuronal homeostasis, robustness, and stress resistance. We found that the activity of the voltage-gated potassium channel seizure (sei), an ortholog of the mammalian ERG channel family, is essential for protecting flies from acute heat-induced seizures. Although sei is broadly expressed in the nervous system, our data indicate that its impact on the organismal robustness to acute environmental stress is primarily mediated via its action in excitatory neurons, the octopaminergic system, as well as neuropile ensheathing and perineurial glia. Furthermore, our studies suggest that human mutations in the human ERG channel (hERG), which have been primarily implicated in the cardiac Long QT Syndrome (LQTS), may also contribute to the high incidence of seizures in LQTS patients via a cardiovascular-independent neurogenic pathway.
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Affiliation(s)
- Alexis S. Hill
- Department of Biology, College of the Holy Cross, Worcester, Massachusetts, United States of America
| | - Poorva Jain
- Department of Biology, Washington University in St. Louis, St. Louis, Missouri, United States of America
| | - Nicole E. Folan
- Department of Biology, College of the Holy Cross, Worcester, Massachusetts, United States of America
| | - Yehuda Ben-Shahar
- Department of Biology, Washington University in St. Louis, St. Louis, Missouri, United States of America
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9
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Loveless J, Lagogiannis K, Webb B. Modelling the mechanics of exploration in larval Drosophila. PLoS Comput Biol 2019; 15:e1006635. [PMID: 31276489 PMCID: PMC6636753 DOI: 10.1371/journal.pcbi.1006635] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/19/2017] [Revised: 07/17/2019] [Accepted: 11/08/2018] [Indexed: 12/03/2022] Open
Abstract
The Drosophila larva executes a stereotypical exploratory routine that appears to consist of stochastic alternation between straight peristaltic crawling and reorientation events through lateral bending. We present a model of larval mechanics for axial and transverse motion over a planar substrate, and use it to develop a simple, reflexive neuromuscular model from physical principles. The mechanical model represents the midline of the larva as a set of point masses which interact with each other via damped translational and torsional springs, and with the environment via sliding friction forces. The neuromuscular model consists of: 1. segmentally localised reflexes that amplify axial compression in order to counteract frictive energy losses, and 2. long-range mutual inhibition between reflexes in distant segments, enabling overall motion of the model larva relative to its substrate. In the absence of damping and driving, the mechanical model produces axial travelling waves, lateral oscillations, and unpredictable, chaotic deformations. The neuromuscular model counteracts friction to recover these motion patterns, giving rise to forward and backward peristalsis in addition to turning. Our model produces spontaneous exploration, even though the nervous system has no intrinsic pattern generating or decision making ability, and neither senses nor drives bending motions. Ultimately, our model suggests a novel view of larval exploration as a deterministic superdiffusion process which is mechanistically grounded in the chaotic mechanics of the body. We discuss how this may provide new interpretations for existing observations at the level of tissue-scale activity patterns and neural circuitry, and provide some experimental predictions that would test the extent to which the mechanisms we present translate to the real larva. We investigate the relationship between brain, body and environment in the exploratory behaviour of fruitfly larva. A larva crawls forward by propagating a wave of compression through its segmented body, and changes its crawling direction by bending to one side or the other. We show first that a purely mechanical model of the larva’s body can produce travelling compression waves, sideways bending, and unpredictable, chaotic motions. For this body to locomote through its environment, it is necessary to add a neuromuscular system to counteract the loss of energy due to friction, and to limit the simultaneous compression of segments. These simple additions allow our model larva to generate life-like forward and backward crawling as well as spontaneous turns, which occur without any direct sensing or control of reorientation. The unpredictability inherent in the larva’s physics causes the model to explore its environment, despite the lack of any neural mechanism for rhythm generation or for deciding when to switch from crawling to turning. Our model thus demonstrates how understanding body mechanics can generate and simplify neurobiological hypotheses as to how behaviour arises.
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Affiliation(s)
- Jane Loveless
- Institute for Perception, Action, and Behaviour, School of Informatics, University of Edinburgh, Edinburgh, Scotland, United Kingdom
| | - Konstantinos Lagogiannis
- Institute for Perception, Action, and Behaviour, School of Informatics, University of Edinburgh, Edinburgh, Scotland, United Kingdom
- MRC Centre for Developmental Neurobiology, New Hunt’s House, King’s College London, London, United Kingdom
| | - Barbara Webb
- Institute for Perception, Action, and Behaviour, School of Informatics, University of Edinburgh, Edinburgh, Scotland, United Kingdom
- * E-mail:
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10
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Zhu Y, de Castro L, Cooper RL. Effect of temperature change on synaptic transmission at crayfish neuromuscular junctions. Biol Open 2018; 7:bio037820. [PMID: 30404904 PMCID: PMC6310894 DOI: 10.1242/bio.037820] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/15/2018] [Accepted: 10/26/2018] [Indexed: 11/20/2022] Open
Abstract
Ectothermic animals in areas characterised by seasonal changes are susceptible to extreme fluctuations in temperature. To survive through varied temperatures, ectotherms have developed unique strategies. This study focuses on synaptic transmission function at cold temperatures, as it is a vital component of ectothermic animals' survival. For determining how synaptic transmission is influenced by an acute change in temperature (20°C to 10°C within a minute) and chronic cold (10°C), the crayfish (Procambarus clarkii) neuromuscular junction (NMJ) was used as a model. To simulate chronic cold conditions, crayfish were acclimated to 15°C for 1 week and then to 10°C for 1 week. They were then used to examine the synaptic properties associated with the low output nerve terminals on the opener muscle in the walking legs and high output innervation on the abdominal deep extensor muscle. The excitatory postsynaptic potentials (EPSPs) of the opener NMJs increased in amplitude with acute warming (20°C) after being acclimated to cold; however, the deep extensor muscles showed varied changes in EPSP amplitude. Synaptic transmission at both NMJs was enhanced with exposure to the modulators serotonin or octopamine. The membrane resistance of the muscles decreased 33% and the resting membrane potential hyperpolarised upon warm exposure. Analysis of haemolymph indicated that octopamine increases during cold exposure. These results suggest bioamine modulation as a possible mechanism for ensuring that synaptic transmission remains functional at low temperatures.
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Affiliation(s)
- Yuechen Zhu
- Department of Biology, University of Kentucky, Lexington, KY 40506-0225, USA
| | - Leo de Castro
- Department of Biology, University of Kentucky, Lexington, KY 40506-0225, USA
- Massachusetts Institute of Technology, Electrical Engineering and Computer Science (EECS), 50 Vassar St, Cambridge, MA 02142, USA
| | - Robin Lewis Cooper
- Department of Biology, University of Kentucky, Lexington, KY 40506-0225, USA
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11
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Ormerod KG, Jung J, Mercier AJ. Modulation of neuromuscular synapses and contraction in Drosophila 3rd instar larvae. J Neurogenet 2018; 32:183-194. [PMID: 30303434 DOI: 10.1080/01677063.2018.1502761] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/13/2023]
Abstract
Over the past four decades, Drosophila melanogaster has become an increasingly important model system for studying the modulation of chemical synapses and muscle contraction by cotransmitters and neurohormones. This review describes how advantages provided by Drosophila have been utilized to investigate synaptic modulation, and it discusses key findings from investigations of cotransmitters and neurohormones that act on body wall muscles of 3rd instar Drosophila larvae. These studies have contributed much to our understanding of how neuromuscular systems are modulated by neuropeptides and biogenic amines, but there are still gaps in relating these peripheral modulatory effects to behavior.
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Affiliation(s)
- Kiel G Ormerod
- a Department of Biology , Massachusetts Institute of Technology , Cambridge , MA , USA
| | - JaeHwan Jung
- b Department of Biological Sciences , Brock University , St. Catharines , Canada
| | - A Joffre Mercier
- b Department of Biological Sciences , Brock University , St. Catharines , Canada
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12
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Stocker B, Bochow C, Damrau C, Mathejczyk T, Wolfenberg H, Colomb J, Weber C, Ramesh N, Duch C, Biserova NM, Sigrist S, Pflüger HJ. Structural and Molecular Properties of Insect Type II Motor Axon Terminals. Front Syst Neurosci 2018; 12:5. [PMID: 29615874 PMCID: PMC5867341 DOI: 10.3389/fnsys.2018.00005] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/08/2017] [Accepted: 02/26/2018] [Indexed: 11/25/2022] Open
Abstract
A comparison between the axon terminals of octopaminergic efferent dorsal or ventral unpaired median neurons in either desert locusts (Schistocerca gregaria) or fruit flies (Drosophila melanogaster) across skeletal muscles reveals many similarities. In both species the octopaminergic axon forms beaded fibers where the boutons or varicosities form type II terminals in contrast to the neuromuscular junction (NMJ) or type I terminals. These type II terminals are immunopositive for both tyramine and octopamine and, in contrast to the type I terminals, which possess clear synaptic vesicles, only contain dense core vesicles. These dense core vesicles contain octopamine as shown by immunogold methods. With respect to the cytomatrix and active zone peptides the type II terminals exhibit active zone-like accumulations of the scaffold protein Bruchpilot (BRP) only sparsely in contrast to the many accumulations of BRP identifying active zones of NMJ type I terminals. In the fruit fly larva marked dynamic changes of octopaminergic fibers have been reported after short starvation which not only affects the formation of new branches (“synaptopods”) but also affects the type I terminals or NMJs via octopamine-signaling (Koon et al., 2011). Our starvation experiments of Drosophila-larvae revealed a time-dependency of the formation of additional branches. Whereas after 2 h of starvation we find a decrease in “synaptopods”, the increase is significant after 6 h of starvation. In addition, we provide evidence that the release of octopamine from dendritic and/or axonal type II terminals uses a similar synaptic machinery to glutamate release from type I terminals of excitatory motor neurons. Indeed, blocking this canonical synaptic release machinery via RNAi induced downregulation of BRP in neurons with type II terminals leads to flight performance deficits similar to those observed for octopamine mutants or flies lacking this class of neurons (Brembs et al., 2007).
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Affiliation(s)
- Bettina Stocker
- Institute of Biology, Neurobiology, Freie Universität Berlin, Berlin, Germany
| | - Christina Bochow
- Institute of Biology, Genetics, Freie Universität Berlin, Berlin, Germany
| | - Christine Damrau
- Institute of Biology, Neurobiology, Freie Universität Berlin, Berlin, Germany
| | - Thomas Mathejczyk
- Institute of Biology, Neurobiology, Freie Universität Berlin, Berlin, Germany
| | - Heike Wolfenberg
- Institute of Biology, Neurobiology, Freie Universität Berlin, Berlin, Germany
| | - Julien Colomb
- Institute of Biology, Neurobiology, Freie Universität Berlin, Berlin, Germany
| | - Claudia Weber
- Institute of Biology, Genetics, Freie Universität Berlin, Berlin, Germany
| | - Niraja Ramesh
- Institute of Biology, Genetics, Freie Universität Berlin, Berlin, Germany
| | - Carsten Duch
- Institute of Biology, Neurobiology, Freie Universität Berlin, Berlin, Germany
| | - Natalia M Biserova
- Institute of Biology, Neurobiology, Freie Universität Berlin, Berlin, Germany
| | - Stephan Sigrist
- Institute of Biology, Genetics, Freie Universität Berlin, Berlin, Germany
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13
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Ryglewski S, Duch C, Altenhein B. Tyramine Actions on Drosophila Flight Behavior Are Affected by a Glial Dehydrogenase/Reductase. Front Syst Neurosci 2017; 11:68. [PMID: 29021745 PMCID: PMC5624129 DOI: 10.3389/fnsys.2017.00068] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/04/2017] [Accepted: 09/07/2017] [Indexed: 11/13/2022] Open
Abstract
The biogenic amines octopamine (OA) and tyramine (TA) modulate insect motor behavior in an antagonistic manner. OA generally enhances locomotor behaviors such as Drosophila larval crawling and flight, whereas TA decreases locomotor activity. However, the mechanisms and cellular targets of TA modulation of locomotor activity are incompletely understood. This study combines immunocytochemistry, genetics and flight behavioral assays in the Drosophila model system to test the role of a candidate enzyme for TA catabolism, named Nazgul (Naz), in flight motor behavioral control. We hypothesize that the dehydrogenase/reductase Naz represents a critical step in TA catabolism. Immunocytochemistry reveals that Naz is localized to a subset of Repo positive glial cells with cell bodies along the motor neuropil borders and numerous positive Naz arborizations extending into the synaptic flight motor neuropil. RNAi knock down of Naz in Repo positive glial cells reduces Naz protein level below detection level by Western blotting. The resulting consequence is a reduction in flight durations, thus mimicking known motor behavioral phenotypes as resulting from increased TA levels. In accord with the interpretation that reduced TA degradation by Naz results in increased TA levels in the flight motor neuropil, the motor behavioral phenotype can be rescued by blocking TA receptors. Our findings indicate that TA modulates flight motor behavior by acting on central circuitry and that TA is normally taken up from the central motor neuropil by Repo-positive glial cells, desaminated and further degraded by Naz.
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Affiliation(s)
- Stefanie Ryglewski
- Institute of Developmental Biology and Neurobiology, Johannes Gutenberg-Universität Mainz, Mainz, Germany
| | - Carsten Duch
- Institute of Developmental Biology and Neurobiology, Johannes Gutenberg-Universität Mainz, Mainz, Germany
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14
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Li Y, Tiedemann L, von Frieling J, Nolte S, El-Kholy S, Stephano F, Gelhaus C, Bruchhaus I, Fink C, Roeder T. The Role of Monoaminergic Neurotransmission for Metabolic Control in the Fruit Fly Drosophila Melanogaster. Front Syst Neurosci 2017; 11:60. [PMID: 28878633 PMCID: PMC5572263 DOI: 10.3389/fnsys.2017.00060] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/08/2017] [Accepted: 07/31/2017] [Indexed: 11/13/2022] Open
Abstract
Hormones control various metabolic traits comprising fat deposition or starvation resistance. Here we show that two invertebrate neurohormones, octopamine (OA) and tyramine (TA) as well as their associated receptors, had a major impact on these metabolic traits. Animals devoid of the monoamine OA develop a severe obesity phenotype. Using flies defective in the expression of receptors for OA and TA, we aimed to decipher the contributions of single receptors for these metabolic phenotypes. Whereas those animals impaired in octß1r, octß2r and tar1 share the obesity phenotype of OA-deficient (tβh-deficient) animals, the octß1r, octß2r deficient flies showed reduced insulin release, which is opposed to the situation found in tβh-deficient animals. On the other hand, OAMB deficient flies were leaner than controls, implying that the regulation of this phenotype is more complex than anticipated. Other phenotypes seen in tβh-deficient animals, such as the reduced ability to perform complex movements tasks can mainly be attributed to the octß2r. Tissue-specific RNAi experiments revealed a very complex interorgan communication leading to the different metabolic phenotypes observed in OA or OA and TA-deficient flies.
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Affiliation(s)
- Yong Li
- Laboratory of Molecular Physiology, Department of Zoology, Kiel UniversityKiel, Germany
| | - Lasse Tiedemann
- Laboratory of Molecular Physiology, Department of Zoology, Kiel UniversityKiel, Germany
| | - Jakob von Frieling
- Laboratory of Molecular Physiology, Department of Zoology, Kiel UniversityKiel, Germany
| | - Stella Nolte
- Laboratory of Molecular Physiology, Department of Zoology, Kiel UniversityKiel, Germany
| | - Samar El-Kholy
- Laboratory of Molecular Physiology, Department of Zoology, Kiel UniversityKiel, Germany
| | - Flora Stephano
- Laboratory of Molecular Physiology, Department of Zoology, Kiel UniversityKiel, Germany
| | - Christoph Gelhaus
- Laboratory of Molecular Physiology, Department of Zoology, Kiel UniversityKiel, Germany
| | - Iris Bruchhaus
- Department of Molecular Parasitology, Bernhard-Nocht-Institute for Tropical MedicineHamburg, Germany
| | - Christine Fink
- Laboratory of Molecular Physiology, Department of Zoology, Kiel UniversityKiel, Germany.,German Center for Lung Research (DZL), Airway Research Center North (ARCN)Kiel, Germany
| | - Thomas Roeder
- Laboratory of Molecular Physiology, Department of Zoology, Kiel UniversityKiel, Germany.,German Center for Lung Research (DZL), Airway Research Center North (ARCN)Kiel, Germany
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15
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Tao J, Bulgari D, Deitcher DL, Levitan ES. Limited distal organelles and synaptic function in extensive monoaminergic innervation. J Cell Sci 2017; 130:2520-2529. [PMID: 28600320 DOI: 10.1242/jcs.201111] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/28/2016] [Accepted: 06/05/2017] [Indexed: 12/20/2022] Open
Abstract
Organelles such as neuropeptide-containing dense-core vesicles (DCVs) and mitochondria travel down axons to supply synaptic boutons. DCV distribution among en passant boutons in small axonal arbors is mediated by circulation with bidirectional capture. However, it is not known how organelles are distributed in extensive arbors associated with mammalian dopamine neuron vulnerability, and with volume transmission and neuromodulation by monoamines and neuropeptides. Therefore, we studied presynaptic organelle distribution in Drosophila octopamine neurons that innervate ∼20 muscles with ∼1500 boutons. Unlike in smaller arbors, distal boutons in these arbors contain fewer DCVs and mitochondria, although active zones are present. Absence of vesicle circulation is evident by proximal nascent DCV delivery, limited impact of retrograde transport and older distal DCVs. Traffic studies show that DCV axonal transport and synaptic capture are not scaled for extensive innervation, thus limiting distal delivery. Activity-induced synaptic endocytosis and synaptic neuropeptide release are also reduced distally. We propose that limits in organelle transport and synaptic capture compromise distal synapse maintenance and function in extensive axonal arbors, thereby affecting development, plasticity and vulnerability to neurodegenerative disease.
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Affiliation(s)
- Juan Tao
- Department of Pharmacology and Chemical Biology, University of Pittsburgh, Pittsburgh, PA 15261, USA
| | - Dinara Bulgari
- Department of Pharmacology and Chemical Biology, University of Pittsburgh, Pittsburgh, PA 15261, USA
| | - David L Deitcher
- Department of Neurobiology and Behavior, Cornell University, Ithaca, NY 14853, USA
| | - Edwin S Levitan
- Department of Pharmacology and Chemical Biology, University of Pittsburgh, Pittsburgh, PA 15261, USA
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16
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Ormerod KG, LePine OK, Abbineni PS, Bridgeman JM, Coorssen JR, Mercier AJ, Tattersall GJ. Drosophila development, physiology, behavior, and lifespan are influenced by altered dietary composition. Fly (Austin) 2017; 11:153-170. [PMID: 28277941 DOI: 10.1080/19336934.2017.1304331] [Citation(s) in RCA: 27] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022] Open
Abstract
Diet profoundly influences the behavior of animals across many phyla. Despite this, most laboratories using model organisms, such as Drosophila, use multiple, different, commercial or custom-made media for rearing their animals. In addition to measuring growth, fecundity and longevity, we used several behavioral and physiological assays to determine if and how altering food media influence wild-type (Canton S) Drosophila melanogaster, at larval, pupal, and adult stages. Comparing 2 commonly used commercial food media we observed several key developmental and morphological differences. Third-instar larvae and pupae developmental timing, body weight and size, and even lifespan significantly differed between the 2 diets, and some of these differences persisted into adulthood. Diet was also found to produce significantly different thermal preference, locomotory capacity for geotaxis, feeding rates, and lower muscle response to hormonal stimulation. There were no differences, however, in adult thermal preferences, in the number or viability of eggs laid, or in olfactory learning and memory between the diets. We characterized the composition of the 2 diets and found particularly significant differences in cholesterol and (phospho)lipids between them. Notably, diacylglycerol (DAG) concentrations vary substantially between the 2 diets, and may contribute to key phenotypic differences, including lifespan. Overall, the data confirm that 2 different diets can profoundly influence the behavior, physiology, morphology and development of wild-type Drosophila, with greater behavioral and physiologic differences occurring during the larval stages.
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Affiliation(s)
- Kiel G Ormerod
- a Department of Biological Sciences , Brock University , St. Catharines , ON , Canada
| | - Olivia K LePine
- a Department of Biological Sciences , Brock University , St. Catharines , ON , Canada
| | - Prabhodh S Abbineni
- b Department of Molecular Physiology, and the WSU Molecular Medicine Research Group, School of Medicine , Western Sydney University , Penrith , New South Wales , Australia
| | - Justin M Bridgeman
- a Department of Biological Sciences , Brock University , St. Catharines , ON , Canada
| | - Jens R Coorssen
- a Department of Biological Sciences , Brock University , St. Catharines , ON , Canada.,b Department of Molecular Physiology, and the WSU Molecular Medicine Research Group, School of Medicine , Western Sydney University , Penrith , New South Wales , Australia.,c Faculty of Graduate Studies, Department of Health Sciences , Brock University , St. Catharines , ON , Canada
| | - A Joffre Mercier
- a Department of Biological Sciences , Brock University , St. Catharines , ON , Canada
| | - Glenn J Tattersall
- a Department of Biological Sciences , Brock University , St. Catharines , ON , Canada
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17
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Reim T, Balfanz S, Baumann A, Blenau W, Thamm M, Scheiner R. AmTAR2: Functional characterization of a honeybee tyramine receptor stimulating adenylyl cyclase activity. INSECT BIOCHEMISTRY AND MOLECULAR BIOLOGY 2017; 80:91-100. [PMID: 27939988 DOI: 10.1016/j.ibmb.2016.12.004] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/20/2016] [Revised: 12/02/2016] [Accepted: 12/06/2016] [Indexed: 06/06/2023]
Abstract
The biogenic monoamines norepinephrine and epinephrine regulate important physiological functions in vertebrates. Insects such as honeybees do not synthesize these neuroactive substances. Instead, they employ octopamine and tyramine for comparable physiological functions. These biogenic amines activate specific guanine nucleotide-binding (G) protein-coupled receptors (GPCRs). Based on pharmacological data obtained on heterologously expressed receptors, α- and β-adrenergic-like octopamine receptors are better activated by octopamine than by tyramine. Conversely, GPCRs forming the type 1 tyramine receptor clade (synonymous to octopamine/tyramine receptors) are better activated by tyramine than by octopamine. More recently, receptors were characterized which are almost exclusively activated by tyramine, thus forming an independent type 2 tyramine receptor clade. Functionally, type 1 tyramine receptors inhibit adenylyl cyclase activity, leading to a decrease in intracellular cAMP concentration ([cAMP]i). Type 2 tyramine receptors can mediate Ca2+ signals or both Ca2+ signals and effects on [cAMP]i. We here provide evidence that the honeybee tyramine receptor 2 (AmTAR2), when heterologously expressed in flpTM cells, exclusively causes an increase in [cAMP]i. The receptor displays a pronounced preference for tyramine over octopamine. Its activity can be blocked by a series of established antagonists, of which mianserin and yohimbine are most efficient. The functional characterization of two tyramine receptors from the honeybee, AmTAR1 (previously named AmTYR1) and AmTAR2, which respond to tyramine by changing cAMP levels in opposite direction, is an important step towards understanding the actions of tyramine in honeybee behavior and physiology, particularly in comparison to the effects of octopamine.
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Affiliation(s)
- Tina Reim
- Institute of Biochemistry and Biology, University of Potsdam, Potsdam, Germany
| | - Sabine Balfanz
- Institute of Complex Systems, ICS-4, Forschungszentrum Jülich, Jülich, Germany
| | - Arnd Baumann
- Institute of Complex Systems, ICS-4, Forschungszentrum Jülich, Jülich, Germany
| | - Wolfgang Blenau
- Zoological Institute, University of Cologne, Cologne, Germany
| | - Markus Thamm
- Institute of Biochemistry and Biology, University of Potsdam, Potsdam, Germany; Behavioral Physiology and Sociobiology (Zoology II), Biocenter, University of Würzburg, Würzburg, Germany
| | - Ricarda Scheiner
- Institute of Biochemistry and Biology, University of Potsdam, Potsdam, Germany; Behavioral Physiology and Sociobiology (Zoology II), Biocenter, University of Würzburg, Würzburg, Germany.
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18
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Li Y, Hoffmann J, Li Y, Stephano F, Bruchhaus I, Fink C, Roeder T. Octopamine controls starvation resistance, life span and metabolic traits in Drosophila. Sci Rep 2016; 6:35359. [PMID: 27759117 PMCID: PMC5069482 DOI: 10.1038/srep35359] [Citation(s) in RCA: 58] [Impact Index Per Article: 7.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/13/2016] [Accepted: 09/28/2016] [Indexed: 01/05/2023] Open
Abstract
The monoamines octopamine (OA) and tyramine (TA) modulate numerous behaviours and physiological processes in invertebrates. Nevertheless, it is not clear whether these invertebrate counterparts of norepinephrine are important regulators of metabolic and life history traits. We show that flies (Drosophila melanogaster) lacking OA are more resistant to starvation, while their overall life span is substantially reduced compared with control flies. In addition, these animals have increased body fat deposits, reduced physical activity and a reduced metabolic resting rate. Increasing the release of OA from internal stores induced the opposite effects. Flies devoid of both OA and TA had normal body fat and metabolic rates, suggesting that OA and TA act antagonistically. Moreover, OA-deficient flies show increased insulin release rates. We inferred that the OA-mediated control of insulin release accounts for a substantial proportion of the alterations observed in these flies. Apparently, OA levels control the balance between thrifty and expenditure metabolic modes. Thus, changes in OA levels in response to external and internal signals orchestrate behaviour and metabolic processes to meet physiological needs. Moreover, chronic deregulation of the corresponding signalling systems in humans may be associated with metabolic disorders, such as obesity or diabetes.
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Affiliation(s)
- Yong Li
- Christian-Albrechts University Kiel, Zoology, Molecular Physiology, 24098 Kiel, Germany
| | - Julia Hoffmann
- Christian-Albrechts University Kiel, Zoology, Molecular Physiology, 24098 Kiel, Germany
| | - Yang Li
- Christian-Albrechts University Kiel, Zoology, Molecular Physiology, 24098 Kiel, Germany
| | - Flora Stephano
- Christian-Albrechts University Kiel, Zoology, Molecular Physiology, 24098 Kiel, Germany
| | - Iris Bruchhaus
- Bernhard-Nocht-Institute for Tropical Medicine, Hamburg, Germany
| | - Christine Fink
- Christian-Albrechts University Kiel, Zoology, Molecular Physiology, 24098 Kiel, Germany.,Airway Research Center North (ARCN), Member of the German Center for Lung Research (DZL), Germany
| | - Thomas Roeder
- Christian-Albrechts University Kiel, Zoology, Molecular Physiology, 24098 Kiel, Germany.,Airway Research Center North (ARCN), Member of the German Center for Lung Research (DZL), Germany
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19
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Huang J, Liu W, Qi YX, Luo J, Montell C. Neuromodulation of Courtship Drive through Tyramine-Responsive Neurons in the Drosophila Brain. Curr Biol 2016; 26:2246-56. [PMID: 27498566 DOI: 10.1016/j.cub.2016.06.061] [Citation(s) in RCA: 33] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/08/2016] [Revised: 06/02/2016] [Accepted: 06/27/2016] [Indexed: 01/12/2023]
Abstract
Neuromodulators influence the activities of collections of neurons and have profound impacts on animal behavior. Male courtship drive is complex and subject to neuromodulatory control. Using the fruit fly Drosophila melanogaster, we identified neurons in the brain (inferior posterior slope; IPS) that impact courtship drive and were controlled by tyramine-a biogenic amine related to dopamine, whose roles in most animals are enigmatic. We knocked out a tyramine-specific receptor, TyrR, which was expressed in IPS neurons. Loss of TyrR led to a striking elevation in courtship activity between males. This effect occurred only in the absence of females, as TyrR(Gal4) mutant males exhibited a wild-type preference for females. Artificial hyperactivation of IPS neurons caused a large increase in male-male courtship, whereas suppression of IPS activity decreased male-female courtship. We conclude that TyrR is a receptor for tyramine, and suggest that it serves to curb high levels of courtship activity through functioning as an inhibitory neuromodulator.
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Affiliation(s)
- Jia Huang
- Institute of Insect Sciences, Zhejiang University, Hangzhou 310058, China; Neuroscience Research Institute and Department of Molecular, Cellular and Developmental Biology, University of California, Santa Barbara, Santa Barbara, CA 93106, USA.
| | - Weiwei Liu
- Neuroscience Research Institute and Department of Molecular, Cellular and Developmental Biology, University of California, Santa Barbara, Santa Barbara, CA 93106, USA
| | - Yi-Xiang Qi
- Institute of Insect Sciences, Zhejiang University, Hangzhou 310058, China
| | - Junjie Luo
- Neuroscience Research Institute and Department of Molecular, Cellular and Developmental Biology, University of California, Santa Barbara, Santa Barbara, CA 93106, USA; The Johns Hopkins University School of Medicine, Baltimore, MD 21205, USA
| | - Craig Montell
- Neuroscience Research Institute and Department of Molecular, Cellular and Developmental Biology, University of California, Santa Barbara, Santa Barbara, CA 93106, USA.
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20
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Insight into the Mode of Action of Haedoxan A from Phryma leptostachya. Toxins (Basel) 2016; 8:53. [PMID: 26907348 PMCID: PMC4773806 DOI: 10.3390/toxins8020053] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/12/2015] [Revised: 02/14/2016] [Accepted: 02/15/2016] [Indexed: 11/26/2022] Open
Abstract
Haedoxan A (HA) is a major active ingredient in the herbaceous perennial plant lopseed (Phryma leptostachya L.), which is used as a natural insecticide against insect pests in East Asia. Here, we report that HA delayed the decay rate of evoked excitatory junctional potentials (EJPs) and increased the frequency of miniature EJPs (mEJPs) on the Drosophila neuromuscular junction. HA also caused a significant hyperpolarizing shift of the voltage dependence of fast inactivation of insect sodium channels expressed in Xenopus oocytes. Our results suggest that HA acts on both axonal conduction and synaptic transmission, which can serve as a basis for elucidating the mode of action of HA for further designing and developing new effective insecticides.
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21
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Scibelli AE, Krans JL. A scalable, high resolution strain sensing matrix suitable for tactile transduction. J Biomech 2016; 49:463-8. [DOI: 10.1016/j.jbiomech.2015.11.056] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/12/2015] [Revised: 11/22/2015] [Accepted: 11/26/2015] [Indexed: 11/25/2022]
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22
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Ormerod KG, LePine OK, Bhutta MS, Jung J, Tattersall GJ, Mercier AJ. Characterizing the physiological and behavioral roles of proctolin in Drosophila melanogaster. J Neurophysiol 2016; 115:568-80. [PMID: 26538605 PMCID: PMC4760479 DOI: 10.1152/jn.00606.2015] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/19/2015] [Accepted: 10/24/2015] [Indexed: 11/22/2022] Open
Abstract
The neuropeptide proctolin (RYLPT) plays important roles as both a neurohormone and a cotransmitter in arthropod neuromuscular systems. We used third-instar Drosophila larvae as a model system to differentiate synaptic effects of this peptide from its direct effects on muscle contractility and to determine whether proctolin can work in a cell-selective manner on muscle fibers. Proctolin did not appear to alter the amplitude of excitatory junctional potentials but did induce sustained muscle contractions in preparations where the CNS had been removed and no stimuli were applied to the remaining nerves. Proctolin-induced contractions were dose-dependent, were reduced by knocking down expression of the Drosophila proctolin receptor in muscle tissue, and were larger in some muscle cells than others (i.e., larger in fibers 4, 12, and 13 than in 6 and 7). Proctolin also increased the amplitude of nerve-evoked contractions in a dose-dependent manner, and the magnitude of this effect was also larger in some muscle cells than others (again, larger in fibers 4, 12, and 13 than in 6 and 7). Increasing the intraburst impulse frequency and number of impulses per burst increased the magnitude of proctolin's enhancement of nerve-evoked contractions and decreased the threshold and EC50 concentrations for proctolin to enhance nerve-evoked contractions. Reducing proctolin receptor expression decreased the velocity of larval crawling at higher temperatures, and thermal preference in these larvae. Our results suggest that proctolin acts directly on body-wall muscles to elicit slow, sustained contractions and to enhance nerve-evoked contractions, and that proctolin affects muscle fibers in a cell-selective manner.
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Affiliation(s)
- Kiel G Ormerod
- Division of Biological Sciences, Brock University, St. Catharines, Ontario, Canada
| | - Olivia K LePine
- Division of Biological Sciences, Brock University, St. Catharines, Ontario, Canada
| | | | - JaeHwan Jung
- Division of Biological Sciences, Brock University, St. Catharines, Ontario, Canada
| | - Glenn J Tattersall
- Division of Biological Sciences, Brock University, St. Catharines, Ontario, Canada
| | - A Joffre Mercier
- Division of Biological Sciences, Brock University, St. Catharines, Ontario, Canada
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23
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Majdi S, Berglund EC, Dunevall J, Oleinick AI, Amatore C, Krantz DE, Ewing AG. Electrochemical Measurements of Optogenetically Stimulated Quantal Amine Release from Single Nerve Cell Varicosities in Drosophila Larvae. Angew Chem Int Ed Engl 2015; 54:13609-12. [PMID: 26387683 DOI: 10.1002/anie.201506743] [Citation(s) in RCA: 39] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/21/2015] [Indexed: 01/01/2023]
Abstract
The nerve terminals found in the body wall of Drosophila melanogaster larvae are readily accessible to experimental manipulation. We used the light-activated ion channel, channelrhodopsin-2, which is expressed by genetic manipulation in Type II varicosities to study octopamine release in Drosophila. We report the development of a method to measure neurotransmitter release from exocytosis events at individual varicosities in the Drosophila larval system by amperometry. A microelectrode was placed in a region of the muscle containing a varicosity and held at a potential sufficient to oxidize octopamine and the terminal stimulated by blue light. Optical stimulation of Type II boutons evokes exocytosis of octopamine, which is detected through oxidization at the electrode surface. We observe 22700±4200 molecules of octopamine released per vesicle. This system provides a genetically accessible platform to study the regulation of amine release at an intact synapse.
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Affiliation(s)
- Soodabeh Majdi
- Department of Chemistry and Chemical Engineering, Chalmers University of Technology Department, Kemivägen 10, 41296 Gothenburg (Sweden)
| | - E Carina Berglund
- Department of Chemistry and Molecular Biology, University of Gothenburg, Kemivägen 10, 41296 Gothenburg (Sweden)
| | - Johan Dunevall
- Department of Chemistry and Chemical Engineering, Chalmers University of Technology Department, Kemivägen 10, 41296 Gothenburg (Sweden)
| | - Alexander I Oleinick
- Ecole Normale Supérieure-PSL Research University, Département de Chimie, Sorbonne Universités-UPMC Univ Paris 06, CNRS UMR 8640 PASTEUR, 24, rue Lhomond, 75005 Paris (France)
| | - Christian Amatore
- Ecole Normale Supérieure-PSL Research University, Département de Chimie, Sorbonne Universités-UPMC Univ Paris 06, CNRS UMR 8640 PASTEUR, 24, rue Lhomond, 75005 Paris (France)
| | - David E Krantz
- Department of Psychiatry and Biobehavioral Sciences, Gonda Center for Neuroscience and Genetics Research, David Geffen School of Medicine at, University of California, Los Angeles, CA (USA)
| | - Andrew G Ewing
- Department of Chemistry and Chemical Engineering, Chalmers University of Technology Department, Kemivägen 10, 41296 Gothenburg (Sweden). .,Department of Chemistry and Molecular Biology, University of Gothenburg, Kemivägen 10, 41296 Gothenburg (Sweden).
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24
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Majdi S, Berglund EC, Dunevall J, Oleinick AI, Amatore C, Krantz DE, Ewing AG. Electrochemical Measurements of Optogenetically Stimulated Quantal Amine Release from Single Nerve Cell Varicosities inDrosophilaLarvae. Angew Chem Int Ed Engl 2015. [DOI: 10.1002/ange.201506743] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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25
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Ormerod KG, Krans JL, Mercier AJ. Cell-selective modulation of the Drosophila neuromuscular system by a neuropeptide. J Neurophysiol 2015; 113:1631-43. [DOI: 10.1152/jn.00625.2014] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022] Open
Abstract
Neuropeptides can modulate physiological properties of neurons in a cell-specific manner. The present work examines whether a neuropeptide can also modulate muscle tissue in a cell-specific manner using identified muscle cells in third-instar larvae of fruit flies. DPKQDFMRFa, a modulatory peptide in the fruit fly Drosophila melanogaster, has been shown to enhance transmitter release from motor neurons and to elicit contractions by a direct effect on muscle cells. We report that DPKQDFMRFa causes a nifedipine-sensitive drop in input resistance in some muscle cells (6 and 7) but not others (12 and 13). The peptide also increased the amplitude of nerve-evoked contractions and compound excitatory junctional potentials (EJPs) to a greater degree in muscle cells 6 and 7 than 12 and 13. Knocking down FMRFamide receptor (FR) expression separately in nerve and muscle indicate that both presynaptic and postsynaptic FR expression contributed to the enhanced contractions, but EJP enhancement was mainly due to presynaptic expression. Muscle ablation showed that DPKQDFMRFa induced contractions and enhanced nerve-evoked contractions more strongly in muscle cells 6 and 7 than cells 12 and 13. In situ hybridization indicated that FR expression was significantly greater in muscle cells 6 and 7 than 12 and 13. Taken together, these results indicate that DPKQDFMRFa can elicit cell-selective effects on muscle fibers. The ability of neuropeptides to work in a cell-selective manner on neurons and muscle cells may help explain why so many peptides are encoded in invertebrate and vertebrate genomes.
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Affiliation(s)
| | - Jacob L. Krans
- Western New England University, Springfield, Massachusetts
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