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https://www.readbyqxmd.com/read/28314750/octopamine-and-tyramine-modulate-the-thermoregulatory-fanning-response-in-honey-bees-apis-mellifera-l
#1
Chelsea N Cook, Colin S Brent, Michael D Breed
Biogenic amines regulate the proximate mechanisms underlying most behavior, including those that contribute to the overall success of complex societies. For honey bees, one critical set of behaviors contributing to the welfare of a colony is involved with nest thermoregulation. Worker honeybees cool the colony by performing a fanning behavior, the expression of which is largely influenced by response thresholds modulated by the social environment. Here, we examined how changes in biogenic amines affect this group-performed thermoregulatory fanning behavior in honeybees...
March 17, 2017: Journal of Experimental Biology
https://www.readbyqxmd.com/read/28300536/hydroxylation-of-4-hydroxyphenylethylamine-derivatives-by-r263-variants-of-the-oxygenase-component-of-p-hydroxyphenylacetate-3-hydroxylase
#2
Pirom Chenprakhon, Taweesak Dhammaraj, Rattikan Chantiwas, Pimchai Chaiyen
p-hydroxyphenylacetate 3-hydroxylase from Acinetobacter baumannii catalyzes the hydroxylation of p-hydroxyphenylacetate (HPA) to yield 3,4-dihydroxyphenylacetate (DHPA). In this study, we investigated whether variants of the oxygenase component (C2) could catalyze hydroxylation of 4-hydroxyphenylethylamines to synthesize catecholamine derivatives. Single turnover product analysis showed that the R263D variant can catalyze hydroxylation of tyramine to form dopamine with the highest yield (57%). The enzyme was also found to have dual substrate charge specificity because it can also maintain reasonable hydroxylation efficiency of HPA (86%)...
March 11, 2017: Archives of Biochemistry and Biophysics
https://www.readbyqxmd.com/read/28279025/identification-of-multiple-functional-receptors-for-tyramine-on-an-insect-secretory-epithelium
#3
Haiying Zhang, Edward M Blumenthal
The biogenic amine tyramine (TA) regulates many aspects of invertebrate physiology and development. Although three TA receptor subtypes have been identified (TAR1-3), specific receptors have not been linked to physiological responses in native tissue. In the Malpighian (renal) tubule of Drosophila melanogaster, TA activates a transepithelial chloride conductance, resulting in diuresis and depolarization of the transepithelial potential. In the current work, mutation or RNAi-mediated knockdown in the stellate cells of the tubule of TAR2 (tyrR, CG7431) resulted in a dramatic reduction, but not elimination, of the TA-mediated depolarization...
December 2017: Scientific Reports
https://www.readbyqxmd.com/read/28235907/octopamine-and-tyramine-regulate-the-activity-of-reproductive-visceral-muscles-in-the-adult-female-blood-feeding-bug-rhodnius-prolixus
#4
Sam Hana, Angela B Lange
The role of octopamine and tyramine in regulating spontaneous contractions of reproductive tissues was examined in the female Rhodnius prolixus Octopamine decreased the amplitude of spontaneous contractions of the oviducts and reduced RhoprFIRFa-induced contractions in a dose-dependent manner, whereas tyramine only reduced the RhoprFIRFa-induced contractions. Both octopamine and tyramine decreased the frequency of spontaneous bursal contractions and completely abolished the contractions at 5×10(-7) M and above...
February 24, 2017: Journal of Experimental Biology
https://www.readbyqxmd.com/read/28188220/cannabinoids-activate-monoaminergic-signaling-to-modulate-key-c-elegans-behaviors
#5
Mitchell D Oakes, Wen Jing Law, Tobias Clark, Bruce A Bamber, Richard Komuniecki
Cannabis sativa, or marijuana, a popular recreational drug, alters sensory perception and exerts a range of potential medicinal benefits. The present study demonstrates that the endogenous cannabinoid receptor agonists 2-arachidonoylglycerol (2-AG) and anandamide (AEA) activate a canonical cannabinoid receptor in Caenorhabditis elegans and also modulate monoaminergic signaling at multiple levels. 2-AG or AEA inhibit nociception and feeding through a pathway requiring the cannabinoid-like receptor NPR-19. 2-AG or AEA activate NPR-19 directly and cannabinoid-dependent inhibition can be rescued in npr-19-null animals by the expression of a human cannabinoid receptor, CB1, highlighting the orthology of the receptors...
March 15, 2017: Journal of Neuroscience: the Official Journal of the Society for Neuroscience
https://www.readbyqxmd.com/read/28167800/learning-gustatory-responsiveness-and-tyramine-differences-across-nurse-and-forager-honeybees
#6
Ricarda Scheiner, Tina Reim, Eirik Søvik, Brian V Entler, Andrew B Barron, Markus Thamm
Honeybees are well known for their complex division of labor. Each bee sequentially performs a series of social tasks during its life. The changes in social task performance are linked to gross differences in behavior and physiology. We here tested whether honeybees performing different social tasks (nursing vs. foraging) would differ in their gustatory responsiveness and associative learning behavior in addition to their daily tasks in the colony. Further, we investigated the role of the biogenic amine tyramine and its receptors in the behavior of nurse bees and foragers...
February 6, 2017: Journal of Experimental Biology
https://www.readbyqxmd.com/read/28167146/are-males-more-scared-of-predators-differential-change-in-metabolic-rate-between-males-and-females-under-predation-risk
#7
Patricio A Lagos, Marie E Herberstein
The non-consumptive effects of predation contribute to reduce preys' fitness. In this way, predation imposes a cost to animals, not only through direct consumption, but also as an energetic cost. One way used to estimate this cost in the past has been to measure the production of CO2 to estimate the change in metabolic rate because of predation. It has been proposed that this change is mediated by the insect stress neurohormone octopamine. Here we study the change in metabolic rate of the black field cricket (Teleogryllus commodus), and how the production of CO2 varies when a chemical cue from a sympatric predator is added...
February 3, 2017: Physiology & Behavior
https://www.readbyqxmd.com/read/28137258/ancient-coexistence-of-norepinephrine-tyramine-and-octopamine-signaling-in-bilaterians
#8
Philipp Bauknecht, Gáspár Jékely
BACKGROUND: Norepinephrine/noradrenaline is a neurotransmitter implicated in arousal and other aspects of vertebrate behavior and physiology. In invertebrates, adrenergic signaling is considered absent and analogous functions are performed by the biogenic amines octopamine and its precursor tyramine. These chemically similar transmitters signal by related families of G-protein-coupled receptors in vertebrates and invertebrates, suggesting that octopamine/tyramine are the invertebrate equivalents of vertebrate norepinephrine...
January 30, 2017: BMC Biology
https://www.readbyqxmd.com/read/28117581/tyramine-pathways-in-citrus-plant-defense-glycoconjugates-of-tyramine-and-its-n-methylated-derivatives
#9
Luigi Servillo, Domenico Castaldo, Alfonso Giovane, Rosario Casale, Nunzia D'Onofrio, Domenico Cautela, Maria Luisa Balestrieri
Glucosylated forms of tyramine and some of its N-methylated derivatives are here reported for the first time to occur in Citrus genus plants. The compounds tyramine-O-β-d-glucoside, N-methyltyramine-O-β-d-glucoside, and N,N-dimethyltyramine-O-β-d-glucoside were detected in juice and leaves of sweet orange, bitter orange, bergamot, citron, lemon, mandarin, and pomelo. The compounds were identified by mass spectrometric analysis, enzymatic synthesis, and comparison with extracts of Stapelia hirsuta L., a plant belonging to the Apocynaceae family in which N,N-dimethyltyramine-O-β-d-glucoside was identified by others...
February 1, 2017: Journal of Agricultural and Food Chemistry
https://www.readbyqxmd.com/read/28105749/octopamine-enhances-oxidative-stress-resistance-through-the-fasting-responsive-transcription-factor-daf-16-foxo-in%C3%A2-c-%C3%A2-elegans
#10
Haruka Hoshikawa, Masaharu Uno, Sakiko Honjoh, Eisuke Nishida
Dietary restriction regimens lead to enhanced stress resistance and extended life span in many species through the regulation of fasting and/or diet-responsive mechanisms. The fasting stimulus is perceived by sensory neurons and causes behavioral and metabolic adaptations. Octopamine (OA), one of the Caenorhabditis elegans neurotransmitters, is involved in behavioral adaptations, and its levels are increased under fasting conditions. However, it remains largely unknown how OA contributes to the fasting responses...
February 2017: Genes to Cells: Devoted to Molecular & Cellular Mechanisms
https://www.readbyqxmd.com/read/28076467/the-search-for-novel-insecticide-targets-in-the-post-genomics-era-with-a-specific-focus-on-g-protein-coupled-receptors
#11
Michelle Ngai, Mary Ann McDowell
Insects are considered pests globally, implicated in the destruction of agricultural fields and transmission of pathogens that cause deadly human diseases, such as dengue, Zika and malaria. The diversity of the insecticide arsenal has remained stagnant for decades, but the recent rise of insecticide resistance fueled the discovery of novel modes of action, and the power of genomics has reinvigorated this search. This review discusses the importance of comparative and functional insect genomics in the identification of potential gene targets for an insecticidal mode of action with low off-target toxicity...
January 1, 2017: Memórias do Instituto Oswaldo Cruz
https://www.readbyqxmd.com/read/28049417/assessing-segmental-versus-non-segmental-features-in-the-ventral-nervous-system-of-onychophorans-velvet-worms
#12
Christine Martin, Vladimir Gross, Hans-Joachim Pflüger, Paul A Stevenson, Georg Mayer
BACKGROUND: Due to their phylogenetic position as one of the closest arthropod relatives, studies of the organisation of the nervous system in onychophorans play a key role for understanding the evolution of body segmentation in arthropods. Previous studies revealed that, in contrast to the arthropods, segmentally repeated ganglia are not present within the onychophoran ventral nerve cords, suggesting that segmentation is either reduced or might be incomplete in the onychophoran ventral nervous system...
January 3, 2017: BMC Evolutionary Biology
https://www.readbyqxmd.com/read/28045132/a-second-generation-snp-and-ssr-integrated-linkage-map-and-qtl-mapping-for-the-chinese-mitten-crab-eriocheir-sinensis
#13
Gao-Feng Qiu, Liang-Wei Xiong, Zhi-Ke Han, Zhi-Qiang Liu, Jian-Bin Feng, Xu-Gan Wu, Yin-Long Yan, Hong Shen, Long Huang, Li Chen
The Chinese mitten crab Eriocheir sinensis is the most economically important cultivated crab species in China, and its genome has a high number of chromosomes (2n = 146). To obtain sufficient markers for construction of a dense genetic map for this species, we employed the recently developed specific-locus amplified fragment sequencing (SLAF-seq) method for large-scale SNPs screening and genotyping in a F1 full-sib family of 149 individuals. SLAF-seq generated 127,677 polymorphic SNP markers, of which 20,803 valid markers were assigned into five segregation types and were used together with previous SSR markers for linkage map construction...
January 3, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28028168/acute-exposure-to-worst-case-concentrations-of-amitraz-does-not-affect-honey-bee-learning-short-term-memory-or-hemolymph-octopamine-levels
#14
Rachel R Rix, G Christopher Cutler
Amitraz, an acaricide used to treat Varroa destructor Anderson & Trueman, is one of the most commonly detected pesticides in honey bee (Apis mellifera L.) hives. Acaricides sometimes negatively impact honey bee cognition, but potential effects of amitraz on honey bee learning have been rarely studied. We topically exposed foragers to 95th percentile field-relevant levels of amitraz and, 24 h later, tested the ability of bees to associate a sucrose reward with a conditioned odor (learning response) using the proboscis extension response (PER)...
December 27, 2016: Journal of Economic Entomology
https://www.readbyqxmd.com/read/28018234/deciphering-the-function-of-octopaminergic-signaling-on-wing-polyphenism-of-the-pea-aphid-acyrthosiphon-pisum
#15
Xing-Xing Wang, Yi Zhang, Zhan-Feng Zhang, Hong-Gang Tian, Tong-Xian Liu
Aphids exhibit wing polyphenism (winged or wingless) for adaption to predictable or temporally heterogeneous environmental changes; however, the underlying mechanism is still unclear. This morphological change could be stimulated by high aphid density, which in turn could affect octopaminergic signaling in aphids. Octopamine is a neurotransmitter synthesized in insects that can modify their physiological metabolism, locomotion, and other behaviors. We designed experiments to determine whether octopamine functions in wing formation of the pea aphid, Acyrthosiphon pisum (Harris)...
2016: Frontiers in Physiology
https://www.readbyqxmd.com/read/28011823/predator-stress-induced-immunosuppression-trade-off-immune-redistribution-or-immune-reconfiguration
#16
Shelley A Adamo, Russell H Easy, Ilya Kovalko, Jenna MacDonald, Ashleigh McKeen, Taylor Swanburg, Kurtis F Turnbull, Catherine Reeve
Although predator exposure increases the risk of wound infections, it typically induces immunosuppression. A number of non-mutually exclusive hypotheses have been put forward to explain this immunosuppression, including: trade-offs between the immune system and other systems required for anti-predator behaviour, redistribution of immune resources towards mechanisms needed to defend against wound infections, and reconfiguration of the immune system to optimize defense under the physiological state of fight-or-flight readiness...
December 23, 2016: Journal of Experimental Biology
https://www.readbyqxmd.com/read/28003472/a-decision-underlies-phototaxis-in-an-insect
#17
E Axel Gorostiza, Julien Colomb, Björn Brembs
Like a moth into the flame-phototaxis is an iconic example for innate preferences. Such preferences probably reflect evolutionary adaptations to predictable situations and have traditionally been conceptualized as hard-wired stimulus-response links. Perhaps for that reason, the century-old discovery of flexibility in Drosophila phototaxis has received little attention. Here, we report that across several different behavioural tests, light/dark preference tested in walking is dependent on various aspects of flight...
December 2016: Open Biology
https://www.readbyqxmd.com/read/27992549/molecular-characterization-and-functional-analysis-of-a-putative-octopamine-tyramine-receptor-during-the-developmental-stages-of-the-pacific-oyster-crassostrea-gigas
#18
Peng Ji, Fei Xu, Baoyu Huang, Yingxiang Li, Li Li, Guofan Zhang
Octopamine (OA) and its precursor, tyramine (TA), participate in invertebrate development such as growth, maturation, and reproduction by activating their corresponding G protein-coupled receptors (GPCRs). Although OA was first discovered in mollusks (octopus), subsequent studies on OA, TA and related receptors have primarily been conducted in Ecdysozoa, especially in insects. Accordingly, only limited reports on OA/TA receptors in mollusks are available and their physiological roles remain unclear. Here, a full-length cDNA encoding a putative 524 amino acid OA/TA receptor (CgGPR1) was isolated from the Pacific oyster Crassostrea gigas...
2016: PloS One
https://www.readbyqxmd.com/read/27939988/amtar2-functional-characterization-of-a-honeybee-tyramine-receptor-stimulating-adenylyl-cyclase-activity
#19
Tina Reim, Sabine Balfanz, Arnd Baumann, Wolfgang Blenau, Markus Thamm, Ricarda Scheiner
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...
January 2017: Insect Biochemistry and Molecular Biology
https://www.readbyqxmd.com/read/27846261/neuromodulation-of-nestmate-recognition-decisions-by-pavement-ants
#20
Andrew N Bubak, Jazmine D W Yaeger, Kenneth J Renner, John G Swallow, Michael J Greene
Ant colonies are distributed systems that are regulated in a non-hierarchical manner. Without a central authority, individuals inform their decisions by comparing information in local cues to a set of inherent behavioral rules. Individual behavioral decisions collectively change colony behavior and lead to self-organization capable of solving complex problems such as the decision to engage in aggressive societal conflicts with neighbors. Despite the relevance to colony fitness, the mechanisms that drive individual decisions leading to cooperative behavior are not well understood...
2016: PloS One
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