1
|
Caminer MA, Libbrecht R, Majoe M, Ho DV, Baumann P, Foitzik S. Task-specific odorant receptor expression in worker antennae indicates that sensory filters regulate division of labor in ants. Commun Biol 2023; 6:1004. [PMID: 37783732 PMCID: PMC10545721 DOI: 10.1038/s42003-023-05273-4] [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: 04/18/2023] [Accepted: 08/22/2023] [Indexed: 10/04/2023] Open
Abstract
Division of labor (DOL) is a characteristic trait of insect societies, where tasks are generally performed by specialized individuals. Inside workers focus on brood or nest care, while others take risks by foraging outside. Theory proposes that workers have different thresholds to perform certain tasks when confronted with task-related stimuli, leading to specialization and consequently DOL. Workers are presumed to vary in their response to task-related cues rather than in how they perceive such information. Here, we test the hypothesis that DOL instead stems from workers varying in their efficiency to detect stimuli of specific tasks. We use transcriptomics to measure mRNA expression levels in the antennae and brain of nurses and foragers of the ant Temnothorax longispinosus. We find seven times as many genes to be differentially expressed between behavioral phenotypes in the antennae compared to the brain. Moreover, half of all odorant receptors are differentially expressed, with an overrepresentation of the 9-exon gene family upregulated in the antennae of nurses. Nurses and foragers thus apparently differ in the perception of their olfactory environment and task-related signals. Our study supports the hypothesis that antennal sensory filters predispose workers to specialize in specific tasks.
Collapse
Affiliation(s)
- Marcel A Caminer
- Institute of Organismic and Molecular Evolution, Johannes Gutenberg University Mainz, Mainz, Germany.
| | - Romain Libbrecht
- Institute of Organismic and Molecular Evolution, Johannes Gutenberg University Mainz, Mainz, Germany
- Institut de Recherche sur la Biologie de l'Insecte, UMR 7261, CNRS, University of Tours, Tours, France
| | - Megha Majoe
- Institute of Organismic and Molecular Evolution, Johannes Gutenberg University Mainz, Mainz, Germany
| | - David V Ho
- Institute of Developmental and Neurobiology, Johannes Gutenberg University Mainz, Mainz, Germany
| | - Peter Baumann
- Institute of Developmental and Neurobiology, Johannes Gutenberg University Mainz, Mainz, Germany
- Institute of Molecular Biology, Mainz, Germany
| | - Susanne Foitzik
- Institute of Organismic and Molecular Evolution, Johannes Gutenberg University Mainz, Mainz, Germany
| |
Collapse
|
2
|
Guo YF, Qiu JR, Chen T, Gao SJ, Su-Hong B, Wang R, Wang JD. Characterization and functional analysis of a β-adrenergic-like octopamine receptor from the oriental armyworm (Mythimna separata Walker). ARCHIVES OF INSECT BIOCHEMISTRY AND PHYSIOLOGY 2021; 106:e21772. [PMID: 33719088 DOI: 10.1002/arch.21772] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/22/2020] [Revised: 12/10/2020] [Accepted: 12/11/2020] [Indexed: 06/12/2023]
Abstract
The β-adrenergic-like octopamine receptor (OA2B2), which binds the biogenic amine octopamine, belongs to the class of G-protein coupled receptors and significantly regulates many physiological and behavioral processes in insects. In this study, the putative open reading frame sequence of the MsOA2B2 gene in Mythimna separata was cloned, the full-length complementary DNA was 1191 bp and it encoded a 396-amino acid protein (GenBank accession number MN822800). Orthologous sequence alignment, phylogenetic tree analysis, and protein sequence analysis all showed that the cloned receptor belongs to the OA2B2 protein family. Real-time quantitative polymerase chain reaction of spatial and temporal expression analysis revealed that the MsOAB2 gene was expressed in all developmental stages of M. separata and was most abundant in egg stages and second and fourth instars compared with other developmental stages, while the expression level during the pupal stage was much lower than that at the other stages. Further analysis with sixth instar M. separata larvae showed that the MsOA2B2 gene was expressed 1.81 times higher in the head than in integument and gut tissues. Dietary ingestion of dsMsOA2B2 significantly reduced the messenger RNA level of MsOA2B2 and decreased mortality following amitraz treatment. This study provides both a pharmacological characterization and the gene expression patterns of OA2B2 in M. separata, facilitating further research for insecticides using MsOA2B2 as a target.
Collapse
MESH Headings
- Animals
- Gene Expression/drug effects
- Genes, Insect
- Insect Control
- Insect Proteins/chemistry
- Insect Proteins/genetics
- Insect Proteins/metabolism
- Insecticides/pharmacology
- Larva/genetics
- Larva/metabolism
- Moths/genetics
- Moths/metabolism
- Phylogeny
- Pupa/genetics
- Pupa/metabolism
- Receptors, Adrenergic, beta/chemistry
- Receptors, Adrenergic, beta/drug effects
- Receptors, Adrenergic, beta/genetics
- Receptors, Adrenergic, beta/metabolism
- Receptors, Biogenic Amine/chemistry
- Receptors, Biogenic Amine/drug effects
- Receptors, Biogenic Amine/genetics
- Receptors, Biogenic Amine/metabolism
- Toluidines/pharmacology
Collapse
Affiliation(s)
- Yan-Fang Guo
- National Engineering Research Center of Sugarcane, Fujian Agricultural and Forestry University, Fuzhou, China
| | - Jia-Ren Qiu
- National Engineering Research Center of Sugarcane, Fujian Agricultural and Forestry University, Fuzhou, China
| | - Tao Chen
- National Engineering Research Center of Sugarcane, Fujian Agricultural and Forestry University, Fuzhou, China
| | - San-Ji Gao
- National Engineering Research Center of Sugarcane, Fujian Agricultural and Forestry University, Fuzhou, China
| | - Bu Su-Hong
- National Engineering Research Center of Sugarcane, Fujian Agricultural and Forestry University, Fuzhou, China
| | - Ran Wang
- Institute of Plant and Environment Protection, Beijing Academy of Agriculture and Forestry Sciences, Beijing, China
| | - Jin-da Wang
- National Engineering Research Center of Sugarcane, Fujian Agricultural and Forestry University, Fuzhou, China
| |
Collapse
|
3
|
Wu M, Wang P, Gao M, Shen D, Zhao Q. Transcriptome analysis of the eggs of the silkworm pale red egg (rep-1) mutant at 36 hours after oviposition. PLoS One 2020; 15:e0237242. [PMID: 32764803 PMCID: PMC7413551 DOI: 10.1371/journal.pone.0237242] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/07/2020] [Accepted: 07/22/2020] [Indexed: 12/04/2022] Open
Abstract
The egg stage is one of the most critical periods in the life history of silkworms, during which physiological processes such as sex determination, tissue organ formation and differentiation, diapause and pigmentation occur. In addition, egg color gradually emerges around 36h after oviposition. The red egg mutant rep-1, which was recently discovered in the C1(H) wild-type, C1(H) exhibits a brown egg color. In this study, the transcriptome of the eggs was analyzed 36h after oviposition. Between the rep-1 mutant and the C1(H) wild-type, 800 differentially expressed genes (DEGs) were identified, including 325 up-regulated genes and 475 down-regulated genes. These DEGs were mainly involved in biological processes (metabolic process, cellular process, biological regulation and regulation of biological process and localization), cellular components (membrane, membrane part, cell, cell part and organelle) and molecular functions (binding, catalytic activity, transporter activity, structural molecule activity and molecular transducer activity). The pathway enrichment of these DEGs was performed based on the KEGG database, and the results indicated that these DEGs were mainly involved in pathways in the following categories: metabolic pathways, longevity-regulating pathway-multiple species, protein processing in endoplasmic reticulum, peroxisome, carbon metabolism and purine metabolism. Further analysis showed that a large number of silkworm growth- and development-related genes and ommochrome synthesis- and metabolism-related genes were differentially expressed, most of which were up-regulated in the mutant. Our research findings provide new experimental evidence for research on ommochrome pigmentation and lay the foundation for further research on the mechanism of the rep-1 mutant.
Collapse
Affiliation(s)
- Meina Wu
- School of Biotechnology, Jiangsu University of Science and Technology, Zhenjiang, Jiangsu, China
- The Sericulture Research Institute, Chinese Academy of Agricultural Sciences, Zhenjiang, Jiangsu, China
| | - Pingyang Wang
- School of Biotechnology, Jiangsu University of Science and Technology, Zhenjiang, Jiangsu, China
- The Sericulture Research Institute, Chinese Academy of Agricultural Sciences, Zhenjiang, Jiangsu, China
- Guangxi Zhuang Autonomous Region Research Academy of Sericultural Science, Guangxi, Nanning, China
| | - Mengjie Gao
- School of Biotechnology, Jiangsu University of Science and Technology, Zhenjiang, Jiangsu, China
- The Sericulture Research Institute, Chinese Academy of Agricultural Sciences, Zhenjiang, Jiangsu, China
| | - Dongxu Shen
- School of Biotechnology, Jiangsu University of Science and Technology, Zhenjiang, Jiangsu, China
- The Sericulture Research Institute, Chinese Academy of Agricultural Sciences, Zhenjiang, Jiangsu, China
| | - Qiaoling Zhao
- School of Biotechnology, Jiangsu University of Science and Technology, Zhenjiang, Jiangsu, China
- The Sericulture Research Institute, Chinese Academy of Agricultural Sciences, Zhenjiang, Jiangsu, China
- * E-mail:
| |
Collapse
|
4
|
Sizemore TR, Hurley LM, Dacks AM. Serotonergic modulation across sensory modalities. J Neurophysiol 2020; 123:2406-2425. [PMID: 32401124 PMCID: PMC7311732 DOI: 10.1152/jn.00034.2020] [Citation(s) in RCA: 18] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/27/2020] [Revised: 05/04/2020] [Accepted: 05/12/2020] [Indexed: 12/24/2022] Open
Abstract
The serotonergic system has been widely studied across animal taxa and different functional networks. This modulatory system is therefore well positioned to compare the consequences of neuromodulation for sensory processing across species and modalities at multiple levels of sensory organization. Serotonergic neurons that innervate sensory networks often bidirectionally exchange information with these networks but also receive input representative of motor events or motivational state. This convergence of information supports serotonin's capacity for contextualizing sensory information according to the animal's physiological state and external events. At the level of sensory circuitry, serotonin can have variable effects due to differential projections across specific sensory subregions, as well as differential serotonin receptor type expression within those subregions. Functionally, this infrastructure may gate or filter sensory inputs to emphasize specific stimulus features or select among different streams of information. The near-ubiquitous presence of serotonin and other neuromodulators within sensory regions, coupled with their strong effects on stimulus representation, suggests that these signaling pathways should be considered integral components of sensory systems.
Collapse
Affiliation(s)
- Tyler R Sizemore
- Department of Biology, West Virginia University, Morgantown, West Virginia
| | - Laura M Hurley
- Department of Biology, Indiana University, Bloomington, Indiana
| | - Andrew M Dacks
- Department of Biology, West Virginia University, Morgantown, West Virginia
- Department of Neuroscience, West Virginia University, Morgantown, West Virginia
| |
Collapse
|
5
|
Tierney AJ. Invertebrate serotonin receptors: a molecular perspective on classification and pharmacology. ACTA ACUST UNITED AC 2018; 221:221/19/jeb184838. [PMID: 30287590 DOI: 10.1242/jeb.184838] [Citation(s) in RCA: 33] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/10/2023]
Abstract
Invertebrate receptors for the neurotransmitter serotonin (5-HT) have been identified in numerous species from diverse phyla, including Arthropoda, Mollusca, Nematoda and Platyhelminthes. For many receptors, cloning and characterization in heterologous systems have contributed data on molecular structure and function across both closely and distantly related species. This article provides an overview of heterologously expressed receptors, and considers evolutionary relationships among them, classification based on these relationships and nomenclature that reflects classification. In addition, transduction pathways and pharmacological profiles are compared across receptor subtypes and species. Previous work has shown that transduction mechanisms are well conserved within receptor subtypes, but responses to drugs are complex. A few ligands display specificity for different receptors within a single species; however, none acts with high specificity in receptors across different species. Two non-selective vertebrate ligands, the agonist 5-methoxytryptamine and antagonist methiothepin, are active in most receptor subtypes in multiple species and hence bind very generally to invertebrate 5-HT receptors. Future challenges for the field include determining how pharmacological profiles are affected by differences in species and receptor subtype, and how function in heterologous receptors can be used to better understand 5-HT activity in intact organisms.
Collapse
Affiliation(s)
- Ann Jane Tierney
- Neuroscience Program, Department of Psychology, Colgate University, Hamilton, NY 13346, USA
| |
Collapse
|
6
|
Antemann V, Pass G, Pflüger HJ. Octopaminergic innervation and a neurohaemal release site in the antennal heart of the locust Schistocerca gregaria. J Comp Physiol A Neuroethol Sens Neural Behav Physiol 2017; 204:131-143. [DOI: 10.1007/s00359-017-1213-5] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/27/2017] [Revised: 08/23/2017] [Accepted: 08/26/2017] [Indexed: 02/02/2023]
|
7
|
Qi YX, Jin M, Ni XY, Ye GY, Lee Y, Huang J. Characterization of three serotonin receptors from the small white butterfly, Pieris rapae. INSECT BIOCHEMISTRY AND MOLECULAR BIOLOGY 2017; 87:107-116. [PMID: 28663125 DOI: 10.1016/j.ibmb.2017.06.011] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/07/2017] [Revised: 06/07/2017] [Accepted: 06/24/2017] [Indexed: 06/07/2023]
Abstract
Serotonin (5-hydroxytryptamine, 5-HT) plays a key role in modulating diverse physiological processes and behaviors in both protostomes and deuterostomes. These functions are mediated through the binding of serotonin to its receptors, which are recognized as potential insecticide targets. We investigated the sequence, pharmacology and tissue distribution of three 5-HT receptors (Piera5-HT1A, Piera5-HT1B, Piera5-HT7) from the small white butterfly Pieris rapae, an important pest of cultivated cabbages and other mustard family crops. Activation of Piera5-HT1A or Piera5-HT1B by 5-HT inhibited the production of cAMP in a dose-dependent manner. Stimulation of Piera5-HT7 with 5-HT increased cAMP level significantly. Surprisingly, with the exception of 5-methoxytryptamine, agonists including α-methylserotonin, 8-Hydroxy-DPAT and 5-carboxamidotryptamine activated these receptors poorly. The results are consistent with previous findings in Manduca sexta. All three receptors were blocked by methiothepin, but ketanserin and yohimbine were not effective. The selective mammalian 5-HT receptor antagonists SB 216641 and SB 269970 displayed potent inhibition effects on Piera5-HT1B and Piera5-HT7 respectively. The results we achieved here indicate that the pharmacological properties of Lepidoptera 5-HT receptors are quite different from those in other insects and vertebrates and may contribute to development of new selective pesticides. This study offers important information on three 5-HT receptors from P. rapae that will facilitate further analysis of the functions of 5-HT receptors in insects.
Collapse
Affiliation(s)
- Yi-Xiang Qi
- Department of Entomology, College of Agriculture, South China Agricultural University, Guangzhou, China; Ministry of Agriculture Key Laboratory of Molecular Biology of Crop Pathogens and Insects, Institute of Insect Sciences, Zhejiang University, Hangzhou, China
| | - Miao Jin
- Ministry of Agriculture Key Laboratory of Molecular Biology of Crop Pathogens and Insects, Institute of Insect Sciences, Zhejiang University, Hangzhou, China
| | - Xu-Yang Ni
- Ministry of Agriculture Key Laboratory of Molecular Biology of Crop Pathogens and Insects, Institute of Insect Sciences, Zhejiang University, Hangzhou, China
| | - Gong-Yin Ye
- Ministry of Agriculture Key Laboratory of Molecular Biology of Crop Pathogens and Insects, Institute of Insect Sciences, Zhejiang University, Hangzhou, China
| | - Youngseok Lee
- Department of Bio and Fermentation Convergence Technology, Kookmin University, Republic of Korea
| | - Jia Huang
- Ministry of Agriculture Key Laboratory of Molecular Biology of Crop Pathogens and Insects, Institute of Insect Sciences, Zhejiang University, Hangzhou, China.
| |
Collapse
|
8
|
Zhukovskaya MI, Polyanovsky AD. Biogenic Amines in Insect Antennae. Front Syst Neurosci 2017; 11:45. [PMID: 28701930 PMCID: PMC5487433 DOI: 10.3389/fnsys.2017.00045] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/01/2017] [Accepted: 06/06/2017] [Indexed: 11/25/2022] Open
Abstract
Insect antenna is a multisensory organ, each modality of which can be modulated by biogenic amines. Octopamine (OA) and its metabolic precursor tyramine (TA) affect activity of antennal olfactory receptor neurons. There is some evidence that dopamine (DA) modulates gustatory neurons. Serotonin can serve as a neurotransmitter in some afferent mechanosensory neurons and both as a neurotransmitter and neurohormone in efferent fibers targeted at the antennal vessel and mechanosensory organs. As a neurohormone, serotonin affects the generation of the transepithelial potential by sensillar accessory cells. Other possible targets of biogenic amines in insect antennae are hygro- and thermosensory neurons and epithelial cells. We suggest that the insect antenna is partially autonomous in the sense that biologically active substances entering its hemolymph may exert their effects and be cleared from this compartment without affecting other body parts.
Collapse
Affiliation(s)
- Marianna I Zhukovskaya
- Laboratory of Evolution of Sense Organs, Sechenov Institute of Evolutionary Biochemistry and Physiology, Russian Academy of SciencesSaint Petersburg, Russia
| | - Andrey D Polyanovsky
- Laboratory of Evolution of Sense Organs, Sechenov Institute of Evolutionary Biochemistry and Physiology, Russian Academy of SciencesSaint Petersburg, Russia
| |
Collapse
|
9
|
Naumenko VS, Ponimaskin EG, Popova NK. 5-HT1A receptor: Role in the regulation of different types of behavior. ACTA ACUST UNITED AC 2017. [DOI: 10.1134/s2079059717010105] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
|
10
|
Lizbinski KM, Metheny JD, Bradley SP, Kesari A, Dacks AM. The anatomical basis for modulatory convergence in the antennal lobe of Manduca sexta. J Comp Neurol 2015; 524:1859-75. [PMID: 26560074 DOI: 10.1002/cne.23926] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/02/2015] [Revised: 11/06/2015] [Accepted: 11/09/2015] [Indexed: 12/14/2022]
Abstract
The release of neuromodulators by widely projecting neurons often allows sensory systems to alter how they process information based on the physiological state of an animal. Neuromodulators alter network function by changing the biophysical properties of individual neurons and the synaptic efficacy with which individual neurons communicate. However, most, if not all, sensory networks receive multiple neuromodulatory inputs, and the mechanisms by which sensory networks integrate multiple modulatory inputs are not well understood. Here we characterized the relative glomerular distribution of two extrinsic neuromodulators associated with distinct physiological states, serotonin (5-HT) and dopamine (DA), in the antennal lobe (AL) of the moth Manduca sexta. By using immunocytochemistry and mass dye fills, we characterized the innervation patterns of both 5-HT- and tyrosine hydroxylase-immunoreactive processes relative to each other, to olfactory receptor neurons (ORNs), to projection neurons (PNs), and to several subsets of local interneurons (LNs). 5-HT immunoreactivity had nearly complete overlap with PNs and LNs, yet no overlap with ORNs, suggesting that 5-HT may modulate PNs and LNs directly but not ORNs. TH immunoreactivity overlapped with PNs, LNs, and ORNs, suggesting that dopamine has the potential to modulate all three cell types. Furthermore, the branching density of each neuromodulator differed, with 5-HT exhibiting denser arborizations and TH-ir processes being sparser. Our results suggest that 5-HT and DA extrinsic neurons target partially overlapping glomerular regions, yet DA extends further into the region occupied by ORNs.
Collapse
Affiliation(s)
- Kristyn M Lizbinski
- Department of Biology, West Virginia University, Morgantown, West Virginia, 26505
| | - Jackie D Metheny
- Department of Biology, West Virginia University, Morgantown, West Virginia, 26505.,Center for Cardiovascular and Pulmonary Research and The Heart Center at Nationwide Children's Hospital, Columbus, Ohio, 43205
| | - Samual P Bradley
- Department of Biology, West Virginia University, Morgantown, West Virginia, 26505
| | - Aditya Kesari
- Department of Biology, West Virginia University, Morgantown, West Virginia, 26505
| | - Andrew M Dacks
- Department of Biology, West Virginia University, Morgantown, West Virginia, 26505
| |
Collapse
|
11
|
Hillier NK, Kavanagh RMB. Differential Octopaminergic Modulation of Olfactory Receptor Neuron Responses to Sex Pheromones in Heliothis virescens. PLoS One 2015; 10:e0143179. [PMID: 26650832 PMCID: PMC4674078 DOI: 10.1371/journal.pone.0143179] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/29/2014] [Accepted: 11/02/2015] [Indexed: 11/18/2022] Open
Abstract
Octopamine is an important neuromodulator of neural function in invertebrates. Octopamine increases male moth sensitivity to female sex pheromones, however, relatively little is known as to the role of octopamine in the female olfactory system, nor its possible effects on the reception of non-pheromone odorants. The purpose of this study was to determine relative effects of octopamine on the sensitivity of the peripheral olfactory system in male and female Heliothis virescens. Single sensillum recording was conducted in both sexes following injection with octopamine or Ringer solution, and during odorant stimulation with conspecific female sex pheromone or host plant volatiles. Results indicate that octopamine plays a significant modulatory role in female sex pheromone detection in female moths; and that male and female pheromone detection neurons share distinct pharmacological and physiological similarities in H. virescens despite sexual dimorphism at the antennal level.
Collapse
Affiliation(s)
- N. Kirk Hillier
- Department of Biology, Acadia University, 33 Westwood Avenue, Wolfville, Nova Scotia, B4P 2R6, Canada
- * E-mail:
| | - Rhys M. B. Kavanagh
- Department of Biology, Acadia University, 33 Westwood Avenue, Wolfville, Nova Scotia, B4P 2R6, Canada
| |
Collapse
|
12
|
Paluzzi JPV, Bhatt G, Wang CHJ, Zandawala M, Lange AB, Orchard I. Identification, functional characterization, and pharmacological profile of a serotonin type-2b receptor in the medically important insect, Rhodnius prolixus. Front Neurosci 2015; 9:175. [PMID: 26041983 PMCID: PMC4436800 DOI: 10.3389/fnins.2015.00175] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/26/2015] [Accepted: 04/28/2015] [Indexed: 11/13/2022] Open
Abstract
In the Chagas disease vector, Rhodnius prolixus, two diuretic hormones act synergistically to dramatically increase fluid secretion by the Malpighian tubules (MTs) during the rapid diuresis that is initiated upon engorgement of vertebrate blood. One of these diuretic hormones is the biogenic amine, serotonin (5-hydroxytryptamine, 5-HT), which controls a variety of additional activities including cuticle plasticization, salivary gland secretion, anterior midgut absorption, cardioacceleratory activity, and myotropic activities on a number of visceral tissues. To better understand the regulatory mechanisms linked to these various physiological actions of serotonin, we have isolated and characterized a serotonin type 2b receptor in R. prolixus, Rhopr5HTR2b, which shares sequence similarity to the vertebrate serotonin type 2 receptors. Rhopr5HTR2b transcript is enriched in well-recognized physiological targets of serotonin, including the MTs, salivary glands and dorsal vessel (i.e., insect heart). Notably, Rhopr5HTR2b was not enriched in the anterior midgut where serotonin stimulates absorption and elicits myotropic control. Using a heterologous functional receptor assay, we examined Rhopr5HTR2b activation characteristics and its sensitivity to potential agonists, antagonists, and other biogenic amines. Rhopr5HTR2b is dose-dependently activated by serotonin with an EC50 in the nanomolar range. Rhopr5HTR2b is sensitive to alpha-methyl serotonin and is inhibited by a variety of serotonin receptor antagonists, including propranolol, spiperone, ketanserin, mianserin, and cyproheptadine. In contrast, the cardioacceleratory activity of serotonin revealed a unique pharmacological profile, with no significant response induced by alpha-methyl serotonin and insensitivity to ketanserin and mianserin. This distinct agonist/antagonist profile indicates that a separate serotonin receptor type may mediate cardiomodulatory effects controlled by serotonin in R. prolixus.
Collapse
Affiliation(s)
| | - Garima Bhatt
- Department of Biology, York University Toronto, ON, Canada ; Department of Biology, University of Toronto Mississauga Mississauga, ON, Canada
| | - Chang-Hui J Wang
- Department of Biology, University of Toronto Mississauga Mississauga, ON, Canada
| | - Meet Zandawala
- Department of Biology, University of Toronto Mississauga Mississauga, ON, Canada
| | - Angela B Lange
- Department of Biology, University of Toronto Mississauga Mississauga, ON, Canada
| | - Ian Orchard
- Department of Biology, University of Toronto Mississauga Mississauga, ON, Canada
| |
Collapse
|
13
|
Schendzielorz T, Schirmer K, Stolte P, Stengl M. Octopamine regulates antennal sensory neurons via daytime-dependent changes in cAMP and IP3 levels in the hawkmoth Manduca sexta. PLoS One 2015; 10:e0121230. [PMID: 25785721 PMCID: PMC4364694 DOI: 10.1371/journal.pone.0121230] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/08/2014] [Accepted: 01/29/2015] [Indexed: 01/01/2023] Open
Abstract
The biogenic amine octopamine (OA) mediates reward signals in olfactory learning and memory as well as circadian rhythms of sleep and activity. In the crepuscular hawkmoth Manduca sexta, OA changed pheromone detection thresholds daytime-dependently, suggesting that OA confers circadian control of olfactory transduction. Thus, with enzyme-linked immunosorbent assays we searched hawkmoth antennae for daytime-dependent changes in the concentration of OA and its respective second messengers. Antennal stimulation with OA raised cAMP- and IP3 levels. Furthermore, antennae expressed daytime-dependent changes in the concentration of OA, with maxima at Zeitgebertime (ZT) 20 when moths were active and also maximal concentrations of cAMP occurred. Maximal IP3 levels at ZT 18 and 23 correlated with maximal flight activity of male moths, while minimal IP3 levels at dusk correlated with peaks of feeding activity. Half maximal effective concentration (EC50) for activation of the OA-receptor decreased during the moth’s activity phase suggesting daytime-dependent changes in OA receptor sensitivity. With an antiserum against tyramine, the precursor of OA, two centrifugal neurons were detected projecting out into the sensory cell layer of the antenna, possibly mediating more rapid stimulus-dependent OA actions. Indeed, in fast kinetic assays OA receptor stimulation increased cAMP concentrations within 50 msec. Thus, we hypothesize that fast, stimulus-dependent centrifugal control of OA-release in the antenna occurs. Additional slow systemic OA actions might be based upon circadian release of OA into the hemolymph mediating circadian rhythms of antennal second messenger levels. The resulting rhythms of odor sensitivity are suggested to underlie circadian rhythms in odor-mediated behavior.
Collapse
Affiliation(s)
| | - Katja Schirmer
- University of Kassel, Biology, Animal Physiology, 34132, Kassel, Germany
| | - Paul Stolte
- University of Kassel, Biology, Animal Physiology, 34132, Kassel, Germany
| | - Monika Stengl
- University of Kassel, Biology, Animal Physiology, 34132, Kassel, Germany
- * E-mail:
| |
Collapse
|
14
|
Wang Q, Mohamed AAM, Takeda M. Serotonin receptor B may lock the gate of PTTH release/synthesis in the Chinese silk moth, Antheraea pernyi; a diapause initiation/maintenance mechanism? PLoS One 2013; 8:e79381. [PMID: 24223937 PMCID: PMC3817057 DOI: 10.1371/journal.pone.0079381] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/24/2013] [Accepted: 09/22/2013] [Indexed: 11/18/2022] Open
Abstract
The release of prothoracicotropic hormone, PTTH, or its blockade is the major endocrine switch regulating the developmental channel either to metamorphosis or to pupal diapause in the Chinese silk moth, Antheraea pernyi. We have cloned cDNAs encoding two types of serotonin receptors (5HTRA and B). 5HTRA-, and 5HTRB-like immunohistochemical reactivities (-ir) were colocalized with PTTH-ir in two pairs of neurosecretory cells at the dorsolateral region of the protocerebrum (DL). Therefore, the causal involvement of these receptors was suspected in PTTH release/synthesis. The level of mRNA(5HTRB) responded to 10 cycles of long-day activation, falling to 40% of the original level before activation, while that of 5HTRA was not affected by long-day activation. Under LD 16:8 and 12:12, the injection of dsRNA(5HTRB) resulted in early diapause termination, whereas that of dsRNA(5HTRA) did not affect the rate of diapause termination. The injection of dsRNA(5HTRB) induced PTTH accumulation, indicating that 5HTRB binding suppresses PTTH synthesis also. This conclusion was supported pharmacologically; the injection of luzindole, a melatonin receptor antagonist, plus 5th inhibited photoperiodic activation under LD 16:8, while that of 5,7-DHT, induced emergence in a dose dependent fashion under LD 12:12. The results suggest that 5HTRB may lock the PTTH release/synthesis, maintaining diapause. This could also work as diapause induction mechanism.
Collapse
Affiliation(s)
- Qiushi Wang
- Graduate School of Agricultural Science, Kobe University, Kobe, Japan
| | | | - Makio Takeda
- Graduate School of Agricultural Science, Kobe University, Kobe, Japan
| |
Collapse
|
15
|
A characterization of the Manduca sexta serotonin receptors in the context of olfactory neuromodulation. PLoS One 2013; 8:e69422. [PMID: 23922709 PMCID: PMC3726668 DOI: 10.1371/journal.pone.0069422] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/05/2013] [Accepted: 06/11/2013] [Indexed: 12/15/2022] Open
Abstract
Neuromodulation, the alteration of individual neuron response properties, has dramatic consequences for neural network function and is a phenomenon observed across all brain regions and taxa. However, the mechanisms underlying neuromodulation are made complex by the diversity of neuromodulatory receptors expressed within a neural network. In this study we begin to examine the receptor basis for serotonergic neuromodulation in the antennal lobe of Manduca sexta. To this end we cloned all four known insect serotonin receptor types from Manduca (the Ms5HTRs). We used phylogenetic analyses to classify the Ms5HTRs and to establish their relationships to other insect serotonin receptors, other insect amine receptors and the vertebrate serotonin receptors. Pharmacological assays demonstrated that each Ms5HTR was selective for serotonin over other endogenous amines and that serotonin had a similar potency at all four Ms5HTRs. The pharmacological assays also identified several agonists and antagonists of the different Ms5HTRs. Finally, we found that the Ms5HT1A receptor was expressed in a subpopulation of GABAergic local interneurons suggesting that the Ms5HTRs are likely expressed heterogeneously within the antennal lobe based on functional neuronal subtype.
Collapse
|
16
|
Riffell JA, Lei H, Abrell L, Hildebrand JG. Neural Basis of a Pollinator's Buffet: Olfactory Specialization and Learning in Manduca sexta. Science 2012; 339:200-4. [DOI: 10.1126/science.1225483] [Citation(s) in RCA: 105] [Impact Index Per Article: 8.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/02/2022]
|
17
|
McQuillan HJ, Barron AB, Mercer AR. Age- and behaviour-related changes in the expression of biogenic amine receptor genes in the antennae of honey bees (Apis mellifera). J Comp Physiol A Neuroethol Sens Neural Behav Physiol 2012; 198:753-61. [DOI: 10.1007/s00359-012-0745-y] [Citation(s) in RCA: 40] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/07/2012] [Revised: 07/24/2012] [Accepted: 07/28/2012] [Indexed: 11/29/2022]
|
18
|
Dacks AM, Riffell JA, Martin JP, Gage SL, Nighorn AJ. Olfactory modulation by dopamine in the context of aversive learning. J Neurophysiol 2012; 108:539-50. [PMID: 22552185 DOI: 10.1152/jn.00159.2012] [Citation(s) in RCA: 30] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/30/2023] Open
Abstract
The need to detect and process sensory cues varies in different behavioral contexts. Plasticity in sensory coding can be achieved by the context-specific release of neuromodulators in restricted brain areas. The context of aversion triggers the release of dopamine in the insect brain, yet the effects of dopamine on sensory coding are unknown. In this study, we characterize the morphology of dopaminergic neurons that innervate each of the antennal lobes (ALs; the first synaptic neuropils of the olfactory system) of the moth Manduca sexta and demonstrate with electrophysiology that dopamine enhances odor-evoked responses of the majority of AL neurons while reducing the responses of a small minority. Because dopamine release in higher brain areas mediates aversive learning we developed a naturalistic, ecologically inspired aversive learning paradigm in which an innately appetitive host plant floral odor is paired with a mimic of the aversive nectar of herbivorized host plants. This pairing resulted in a decrease in feeding behavior that was blocked when dopamine receptor antagonists were injected directly into the ALs. These results suggest that a transient dopaminergic enhancement of sensory output from the AL contributes to the formation of aversive memories. We propose a model of olfactory modulation in which specific contexts trigger the release of different neuromodulators in the AL to increase olfactory output to downstream areas of processing.
Collapse
Affiliation(s)
- Andrew M Dacks
- Department of Neuroscience, The University of Arizona, Tucson, Arizona, USA.
| | | | | | | | | |
Collapse
|
19
|
Modulatory actions of dopamine and serotonin on insect antennal lobe neurons: insights from studies in vitro. J Mol Histol 2012; 43:401-4. [DOI: 10.1007/s10735-012-9401-7] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/11/2012] [Accepted: 03/05/2012] [Indexed: 10/28/2022]
|
20
|
Abstract
Calling female moths attract their mates late at night with intermittent release of a species-specific sex-pheromone blend. Mean frequency of pheromone filaments encodes distance to the calling female. In their zig-zagging upwind search male moths encounter turbulent pheromone blend filaments at highly variable concentrations and frequencies. The male moth antennae are delicately designed to detect and distinguish even traces of these sex pheromones amongst the abundance of other odors. Its olfactory receptor neurons sense even single pheromone molecules and track intermittent pheromone filaments of highly variable frequencies up to about 30 Hz over a wide concentration range. In the hawkmoth Manduca sexta brief, weak pheromone stimuli as encountered during flight are detected via a metabotropic PLCβ-dependent signal transduction cascade which leads to transient changes in intracellular Ca2+ concentrations. Strong or long pheromone stimuli, which are possibly perceived in direct contact with the female, activate receptor-guanylyl cyclases causing long-term adaptation. In addition, depending on endogenous rhythms of the moth's physiological state, hormones such as the stress hormone octopamine modulate second messenger levels in sensory neurons. High octopamine levels during the activity phase maximize temporal resolution cAMP-dependently as a prerequisite to mate location. Thus, I suggest that sliding adjustment of odor response threshold and kinetics is based upon relative concentration ratios of intracellular Ca2+ and cyclic nucleotide levels which gate different ion channels synergistically. In addition, I propose a new hypothesis for the cyclic nucleotide-dependent ion channel formed by insect olfactory receptor/coreceptor complexes. Instead of being employed for an ionotropic mechanism of odor detection it is proposed to control subthreshold membrane potential oscillation of sensory neurons, as a basis for temporal encoding of odors.
Collapse
Affiliation(s)
- Monika Stengl
- FB 10, Biology, Animal Physiology, University of Kassel Kassel, Germany
| |
Collapse
|
21
|
Shao QM, Fouda MMA, Takeda M. Serotonin- and two putative serotonin receptors-like immunohistochemical reactivities in the ground crickets Dianemobius nigrofasciatus and Allonemobius allardi. JOURNAL OF INSECT PHYSIOLOGY 2010; 56:1576-1586. [PMID: 20685356 DOI: 10.1016/j.jinsphys.2010.05.015] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/26/2010] [Revised: 05/18/2010] [Accepted: 05/18/2010] [Indexed: 05/29/2023]
Abstract
Serotonin (5-hydroxytryptamine; 5-HT)- and two putative serotonin receptors, 5-HT1A- and 5-HT1B-like, immunohistochemical reactivities were investigated in the cephalic ganglia of two ground crickets, Dianemobius nigrofasciatus and Allonemobius allardi. 5-HT-ir was strongly expressed in the central body, accessory medulla region of the optic lobe, frontal ganglion, posterior cortex of the protocerebrum, dorsolateral region of the protocerebrum, and the suboesphageal ganglion (SOG) in both crickets. However, 5-HT1A-ir and 5-HT1B-ir showed quite mutually distinct patterns that were also distinct from 5-HT-ir. 5-HT1A-ir was located in the pars intercerebralis, dorsolateral region of the protocerebrum, optic tract, optic lobe, and the midline of the SOG in both crickets. 5-HT1B-ir was located in the pars intercerebralis and dorsolateral region of the protocerebrum, and detected weakly in the optic lobe, tritocerebrum, and the midline of the SOG in both crickets. Interspecific differences were observed with 5-HT1A-ir. 5-HT1A-ir was expressed weakly in two neurons in the mandibular neuromere of the SOG in D. nigrofasciatus, while it was expressed strongly in the tritocerebrum, mandibular neuromere, and maxillary neuromere of the SOG in A. allardi and co-localized with CLOCK-ir (CLK-ir). 5HT-1B-ir was co-localized with CLK-ir in the tritocerebrum, mandibular neuromere, and maxillary neuromere of the SOG when double-labeling was conducted in both crickets. These results indicated that 5-HT and both types of 5-HT receptors may regulate circadian photo-entrainment or photoperiodism in A. allardi, while only 5-HT1B may be involved in circadian photo-entrainment or photoperiodism in D. nigrofasciatus.
Collapse
Affiliation(s)
- Qi-Miao Shao
- Graduate School of Agriculture Science, Kobe University, Kobe, Japan
| | | | | |
Collapse
|
22
|
Verlinden H, Vleugels R, Marchal E, Badisco L, Pflüger HJ, Blenau W, Broeck JV. The role of octopamine in locusts and other arthropods. JOURNAL OF INSECT PHYSIOLOGY 2010; 56:854-867. [PMID: 20621695 DOI: 10.1016/j.jinsphys.2010.05.018] [Citation(s) in RCA: 109] [Impact Index Per Article: 7.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/29/2010] [Revised: 05/19/2010] [Accepted: 05/20/2010] [Indexed: 05/29/2023]
Abstract
The biogenic amine octopamine and its biological precursor tyramine are thought to be the invertebrate functional homologues of the vertebrate adrenergic transmitters. Octopamine functions as a neuromodulator, neurotransmitter and neurohormone in insect nervous systems and prompts the whole organism to "dynamic action". A growing number of studies suggest a prominent role for octopamine in modulating multiple physiological and behavioural processes in invertebrates, as for example the phase transition in Schistocerca gregaria. Both octopamine and tyramine exert their effects by binding to specific receptor proteins that belong to the superfamily of G protein-coupled receptors. Since these receptors do not appear to be present in vertebrates, they may present very suitable and specific insecticide and acaricide targets.
Collapse
Affiliation(s)
- Heleen Verlinden
- Molecular Developmental Physiology and Signal Transduction, Animal Physiology and Neurobiology, Zoological Institute, KU Leuven, Naamsestraat 59, B-3000 Leuven, Belgium
| | | | | | | | | | | | | |
Collapse
|
23
|
Flecke C, Nolte A, Stengl M. Perfusion with cAMP analogue affects pheromone-sensitive trichoid sensilla of the hawkmoth Manduca sexta in a time-dependent manner. ACTA ACUST UNITED AC 2010; 213:842-52. [PMID: 20154200 DOI: 10.1242/jeb.032839] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
Abstract
Octopamine causes time-dependent disadaptation of pheromone-sensitive olfactory receptor neurons (ORNs) of Manduca sexta. Because the majority of insect octopamine receptors are positively coupled to adenylyl cyclases we examined whether cyclic adenosine monophosphate (cAMP) mimics octopamine-dependent modulation of pheromone transduction in a time-dependent manner. Long-term tip recordings of single trichoid sensilla of Manduca sexta were performed during three zeitgeber times (ZTs, ZT 0=lights on), while stimulating the sensilla with two doses of the main pheromone component bombykal in a non-adapting protocol. The membrane-permeable cAMP analogue 8bcAMP increased the normalized sensillar potential amplitude in a time- and bombykal dose-dependent way. At the higher bombykal dose only, the applied 8bcAMP antagonized an endogenous decrease in the mean sensillar potential amplitude at ZT 1-4 and ZT 8-11 when ORNs were adapted but not at ZT 22-1, when ORNs were sensitized. In contrast to octopamine, 8bcAMP did not consistently affect the initial pheromone-dependent action potential frequency, the phasic/tonic response pattern, or the time-dependent shift to lower mean action potential frequencies at ZT 8-11. Furthermore, 8bcAMP increased the spontaneous action potential frequency time dependently, but differently from octopamine. In conclusion, our results show that cAMP only partly mimics the octopamine-dependent disadaptation of olfactory receptor neurons during photophase, apparently due to another missing octopamine-dependent synergistic factor such as defined intracellular calcium levels.
Collapse
Affiliation(s)
- Christian Flecke
- Biologie, Tierphysiologie, Philipps-Universität Marburg, 35032 Marburg, Germany
| | | | | |
Collapse
|
24
|
Vázquez-Acevedo N, Reyes-Colón D, Ruíz-Rodríguez EA, Rivera NM, Rosenthal J, Kohn AB, Moroz LL, Sosa MA. Cloning and immunoreactivity of the 5-HT 1Mac and 5-HT 2Mac receptors in the central nervous system of the freshwater prawn Macrobrachium rosenbergii. J Comp Neurol 2009; 513:399-416. [PMID: 19184976 PMCID: PMC2719784 DOI: 10.1002/cne.21979] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Abstract
Biogenic amines are implicated in several mental disorders, many of which involve social interactions. Simple model systems, such as crustaceans, are often more amenable than vertebrates for studying mechanisms underlying behaviors. Although various cellular responses of biogenic amines have been characterized in crustaceans, the mechanisms linking these molecules to behavior remain largely unknown. Observed effects of serotonin receptor agonists and antagonists in abdomen posture, escape responses, and fighting have led to the suggestion that biogenic amine receptors may play a role in modulating interactive behaviors. As a first step in understanding this potential role of such receptors, we have cloned and fully sequenced two serotonin receptors, 5-HT(1Mac) and 5-HT(2Mac), from the CNS of the freshwater prawn Macrobrachium rosenbergii and have mapped their CNS immunohistochemical distribution. 5-HT(1Mac) was found primarily on the membranes of subsets of cells in all CNS ganglia, in fibers that traverse all CNS regions, and in the cytoplasm of a small number of cells in the brain and circum- and subesophageal ganglia (SEG), most of which also appear to contain dopamine. The pattern of 5-HT(2Mac) immunoreactivity was found to differ significantly; it was found mostly in the central neuropil area of all ganglia, in glomeruli of the brain's olfactory lobes, and in the cytoplasm of a small number of neurons in the SEG, thoracic, and some abdominal ganglia. The observed differences in terms of localization, distribution within cells, and intensity of immunoreactive staining throughout the prawn's CNS suggest that these receptors are likely to play different roles.
Collapse
MESH Headings
- Amino Acid Sequence
- Animals
- Antibodies
- Blotting, Western
- Central Nervous System/metabolism
- Conserved Sequence
- Dopamine/metabolism
- Evolution, Molecular
- Immunohistochemistry
- Male
- Molecular Sequence Data
- Palaemonidae/genetics
- Palaemonidae/metabolism
- Phylogeny
- Receptors, Serotonin, 5-HT1/genetics
- Receptors, Serotonin, 5-HT1/metabolism
- Receptors, Serotonin, 5-HT2/genetics
- Receptors, Serotonin, 5-HT2/metabolism
- Sequence Analysis, DNA
Collapse
Affiliation(s)
- Nietzell Vázquez-Acevedo
- Department of Anatomy and Neurobiology, School of Medicine, Medical Sciences Campus, University of Puerto Rico, San Juan, Puerto Rico 00936 USA
- Institute of Neurobiology, Medical Sciences Campus, University of Puerto Rico, San Juan, Puerto Rico 00936 USA
| | - Dalynés Reyes-Colón
- Department of Anatomy and Neurobiology, School of Medicine, Medical Sciences Campus, University of Puerto Rico, San Juan, Puerto Rico 00936 USA
- Institute of Neurobiology, Medical Sciences Campus, University of Puerto Rico, San Juan, Puerto Rico 00936 USA
| | - Eduardo A. Ruíz-Rodríguez
- Institute of Neurobiology, Medical Sciences Campus, University of Puerto Rico, San Juan, Puerto Rico 00936 USA
- Department of Social Sciences, Cayey Campus, University of Puerto Rico, Cayey, Puerto Rico 00736 USA
| | - Nilsa M. Rivera
- Department of Anatomy and Neurobiology, School of Medicine, Medical Sciences Campus, University of Puerto Rico, San Juan, Puerto Rico 00936 USA
- Institute of Neurobiology, Medical Sciences Campus, University of Puerto Rico, San Juan, Puerto Rico 00936 USA
| | - Joshua Rosenthal
- Institute of Neurobiology, Medical Sciences Campus, University of Puerto Rico, San Juan, Puerto Rico 00936 USA
| | - Andrea B. Kohn
- The Whitney Laboratory for Marine Bioscience and Department of Neuroscience, University of Florida, St. Augustine, Florida 32080 USA
| | - Leonid L. Moroz
- The Whitney Laboratory for Marine Bioscience and Department of Neuroscience, University of Florida, St. Augustine, Florida 32080 USA
| | - María A. Sosa
- Department of Anatomy and Neurobiology, School of Medicine, Medical Sciences Campus, University of Puerto Rico, San Juan, Puerto Rico 00936 USA
- Institute of Neurobiology, Medical Sciences Campus, University of Puerto Rico, San Juan, Puerto Rico 00936 USA
| |
Collapse
|
25
|
Flecke C, Stengl M. Octopamine and tyramine modulate pheromone-sensitive olfactory sensilla of the hawkmoth Manduca sexta in a time-dependent manner. J Comp Physiol A Neuroethol Sens Neural Behav Physiol 2009; 195:529-45. [PMID: 19301013 DOI: 10.1007/s00359-009-0429-4] [Citation(s) in RCA: 32] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/07/2008] [Revised: 02/11/2009] [Accepted: 02/22/2009] [Indexed: 10/21/2022]
Abstract
In moths octopamine improved pheromone-dependent mate search time dependently. In the nocturnal hawkmoth Manduca sexta long-term tip recordings of trichoid sensilla were performed to investigate whether biogenic amines modulate pheromone transduction time dependently. At three Zeitgebertimes octopamine, tyramine and the octopamine antagonist epinastine were applied during non-adapting pheromone-stimulation. At ZT 8-11, during the photophase, when sensilla were adapted, octopamine and to a lesser extent tyramine increased the bombykal-dependent sensillar potential amplitude and initial action potential (AP) frequency. In addition, during the photophase, when sensilla are less able to resolve pheromone pulses, octopamine rendered pheromone responses more phasic and sensitive, and raised the spontaneous AP frequency. During the late scotophase, at ZT 22-1, when the antenna appeared maximally sensitized for pheromone pulse detection and endogenous octopamine levels are high, exogenously applied octopamine was ineffective. Epinastine blocked the pheromone-dependent AP response at ZT 8-11 and slightly affected it at ZT 22-1, while it had no effect on the sensillar potential amplitude. Epinastine decreased the spontaneous AP activity during photophase and scotophase and rendered pheromone responses more tonic in the scotophase. We hypothesize that the presence of octopamine in the antenna is obligatory for the detection of intermittent pheromone pulses at all Zeitgebertimes.
Collapse
Affiliation(s)
- Christian Flecke
- Biologie, Tierphysiologie, Philipps-Universität Marburg, 35032, Marburg, Germany.
| | | |
Collapse
|
26
|
Brigaud I, Grosmaître X, François MC, Jacquin-Joly E. Cloning and expression pattern of a putative octopamine/tyramine receptor in antennae of the noctuid moth Mamestra brassicae. Cell Tissue Res 2008; 335:455-63. [PMID: 19034524 DOI: 10.1007/s00441-008-0722-5] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/29/2008] [Accepted: 10/10/2008] [Indexed: 11/26/2022]
Abstract
In insects, biogenic amines have been shown to play an important role in olfactory plasticity. In a first attempt to decipher the underlying molecular mechanisms, we report the molecular cloning and precise expression pattern of a newly identified octopamine/tyramine-receptor-encoding gene in the antennae of the noctuid moth Mamestra brassicae (MbraOAR/TAR). A full-length cDNA has been obtained through homology cloning in combination with rapid amplification of cDNA ends/polymerase chain reaction; the deduced protein exhibits high identities with previously identified octopamine/tyramine receptors in other moths. In situ hybridization within the antennae has revealed that MbraOAR/TAR is expressed at the bases of both pheromone-sensitive and non-sensitive olfactory sensilla and in cells with a neurone-like shape. In accordance with previous physiological studies that have revealed a role of biogenic amines in the electrical activity of the receptor neurones, our results suggest that biogenic amines (either octopamine or tyramine) target olfactory receptor neurones to modulate olfactory coding as early as the antennal level.
Collapse
Affiliation(s)
- Isabelle Brigaud
- INRA, UMR 1272 INRA-UPMC-AgroParisTech PISC Physiologie de l'Insecte: Signalisation et Communication, Route de Saint-Cyr, 78000 Versailles, France
| | | | | | | |
Collapse
|
27
|
Kloppenburg P, Mercer AR. Serotonin modulation of moth central olfactory neurons. ANNUAL REVIEW OF ENTOMOLOGY 2008; 53:179-190. [PMID: 18067443 DOI: 10.1146/annurev.ento.53.103106.093408] [Citation(s) in RCA: 31] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/25/2023]
Abstract
In the tobacco hornworm, Manduca sexta, 5-hydroxytryptamine (5HT) acting at the level of the antennal lobes contributes significantly to changing the moth's responsiveness to olfactory stimuli. 5HT targets K(+) conductances in the cells, increasing the excitability of central olfactory neurons and their responsiveness to olfactory cues. Effects of 5HT modulation are apparent not only at the single cell level, but also in the activity patterns of populations of neurons that convey olfactory information from antennal lobes to higher centers of the brain. Evidence suggests that 5HT-induced changes in activity within neural circuits of the antennal lobes might also drive structural plasticity, providing the basis for longer-term changes in antennal lobe function.
Collapse
|
28
|
Grandy DK. Trace amine-associated receptor 1-Family archetype or iconoclast? Pharmacol Ther 2007; 116:355-90. [PMID: 17888514 PMCID: PMC2767338 DOI: 10.1016/j.pharmthera.2007.06.007] [Citation(s) in RCA: 141] [Impact Index Per Article: 8.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/22/2007] [Accepted: 06/25/2007] [Indexed: 01/25/2023]
Abstract
Interest has recently been rekindled in receptors that are activated by low molecular weight, noncatecholic, biogenic amines that are typically found as trace constituents of various vertebrate and invertebrate tissues and fluids. The timing of this resurgent focus on receptors activated by the "trace amines" (TA) beta-phenylethylamine (PEA), tyramine (TYR), octopamine (OCT), synephrine (SYN), and tryptamine (TRYP) is the direct result of 2 publications that appeared in 2001 describing the cloning of a novel G protein-coupled receptor (GPCR) referred to by their discoverers Borowsky et al. as TA1 and Bunzow et al. as TA receptor 1 (TAR1). When heterologously expressed in Xenopus laevis oocytes and various eukaryotic cell lines, recombinant rodent and human TAR dose-dependently couple to the stimulation of adenosine 3',5'-monophosphate (cAMP) production. Structure-activity profiling based on this functional response has revealed that in addition to the TA, other biologically active compounds containing a 2-carbon aliphatic side chain linking an amino group to at least 1 benzene ring are potent and efficacious TA receptor agonists with amphetamine (AMPH), methamphetamine, 3-iodothyronamine, thyronamine, and dopamine (DA) among the most notable. Almost 100 years after the search for TAR began, numerous TA1/TAR1-related sequences, now called TA-associated receptors (TAAR), have been identified in the genome of every species of vertebrate examined to date. Consequently, even though heterologously expressed TAAR1 fits the pharmacological criteria established for a bona fide TAR, a major challenge for those working in the field is to discern the in vivo pharmacology and physiology of each purported member of this extended family of GPCR. Only then will it be possible to establish whether TAAR1 is the family archetype or an iconoclast.
Collapse
Affiliation(s)
- David K Grandy
- Department of Physiology and Pharmacology, L334, School of Medicine, Oregon Health and Science University, Portland, OR 97239, United States.
| |
Collapse
|
29
|
Smith KA, Rex EB, Komuniecki RW. Are Caenorhabditis elegans receptors useful targets for drug discovery: pharmacological comparison of tyramine receptors with high identity from C. elegans (TYRA-2) and Brugia malayi (Bm4). Mol Biochem Parasitol 2007; 154:52-61. [PMID: 17537528 PMCID: PMC3430142 DOI: 10.1016/j.molbiopara.2007.04.004] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/27/2007] [Revised: 03/29/2007] [Accepted: 04/07/2007] [Indexed: 11/16/2022]
Abstract
The biogenic amine, tyramine (TA), modulates a number of key processes in nematodes and a number of TA-specific receptors have been identified. In the present study, we have identified a putative TA receptor (Bm4) in the recently completed Brugia malayi genome and compared its pharmacology to its putative Caenorhabditis elegans orthologue, TYRA-2, under identical expression and assay conditions. TYRA-2 and Bm4 are the most closely related C. elegans and B. malayi BA receptors and differ by only 14aa in the TM regions directly involved in ligand binding. Membranes from HEK-293 cells stably expressing Bm4 exhibited specific, saturable, high affinity, [(3)H]LSD and [(3)H]TA binding with K(d)s of 18.1+/-0.93 and 15.1+/-0.2 nM, respectively. More importantly, both TYRA-2 and Bm4 TA exhibited similar rank orders of potencies for a number of potential tyraminergic ligands. However, some significant differences were noted. For example, chloropromazine exhibited an order of magnitude higher affinity for Bm4 than TYRA-2 (pK(i)s of 7.6+/-0.2 and 6.49+/-0.1, respectively). In contrast, TYRA-2 had significantly higher affinity for phentolamine than Bm4. These results highlight the utility of the nearly completed B. malayi genome and the importance of using receptors from individual parasitic nematodes for drug discovery.
Collapse
Affiliation(s)
- Katherine A. Smith
- Department of Biological Sciences, University of Toledo, 2801 West Bancroft Street, Toledo, OH 43606
| | - Elizabeth B. Rex
- National Institute on Alcohol Abuse and Alcoholism, National Institutes of Health, Rockville, MD
| | - Richard W. Komuniecki
- Department of Biological Sciences, University of Toledo, 2801 West Bancroft Street, Toledo, OH 43606
| |
Collapse
|
30
|
Farooqui T. Octopamine-mediated neuromodulation of insect senses. Neurochem Res 2007; 32:1511-29. [PMID: 17484052 DOI: 10.1007/s11064-007-9344-7] [Citation(s) in RCA: 101] [Impact Index Per Article: 5.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/24/2006] [Accepted: 04/03/2007] [Indexed: 11/28/2022]
Abstract
Octopamine functions as a neuromodulator, neurotransmitter, and neurohormone in insect nervous systems. Octopamine has a prominent role in influencing multiple physiological events: (a) as a neuromodulator, it regulates desensitization of sensory inputs, arousal, initiation, and maintenance of various rhythmic behaviors and complex behaviors such as learning and memory; (b) as a neurotransmitter, it regulates endocrine gland activity; and (c) as a neurohormone, it induces mobilization of lipids and carbohydrates. Octopamine exerts its effects by binding to specific proteins that belong to the superfamily of G protein-coupled receptors and share the structural motif of seven transmembrane domains. The activation of octopamine receptors is coupled with different second messenger pathways depending on species, tissue source, receptor type and cell line used for the expression of cloned receptor. The second messengers include adenosine 3',5'-cyclic monophosphate (cAMP), calcium, diacylglycerol (DAG), and inositol 1,4,5-trisphosphate (IP3). The cAMP activates protein kinase A, calcium and DAG activate protein kinase C, and IP3 mobilizes calcium from intracellular stores. Octopamine-mediated generation of these second messengers is associated with changes in cellular response affecting insect behaviors. The main objective of this review is to discuss significance of octopamine-mediated neuromodulation in insect sensory systems.
Collapse
Affiliation(s)
- Tahira Farooqui
- Department of Entomology, The Ohio State University, 400 Aronoff Laboratory, 318 West 12th Ave., Columbus, OH 43210-1220, USA.
| |
Collapse
|