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https://www.readbyqxmd.com/read/28930573/molecular-biology-of-amitraz-resistance-in-cattle-ticks-of-the-genus-rhipicephalus
#1
Nicholas N Jonsson, Guilherme Klafke, Sean W Corley, Jason Tidwell, Christina M Berry, Hh Caline Koh-Tan
Amitraz is an important product for the control of cattle ticks around the world. In comparison with other products for the control of ticks, it is quite affordable and it has a rapid knock-down effect. It binds with and activates adrenergic neuro-receptors of animals and it inhibits the action of monoamine oxidases (MAO). Resistance to amitraz has been documented in Rhipicephalus microplus, R. decoloratus and R. appendiculatus. Four mechanisms of resistance have been proposed, each of which is supported by evidence but none of which has been definitively confirmed as the cause of resistance in the field...
January 1, 2018: Frontiers in Bioscience (Landmark Edition)
https://www.readbyqxmd.com/read/28918475/octopaminergic-innervation-and-a-neurohaemal-release-site-in-the-antennal-heart-of-the-locust-schistocerca-gregaria
#2
Victoria Antemann, Günther Pass, Hans-Joachim Pflüger
A detailed account is given by the octopaminergic innervation of the antennal heart in Schistocerca gregaria using various immunohistochemical methods. Anterograde axonal filling illustrates the unilateral innervation on the medial ventral surface of the pumping muscle of the antennal heart via the paired corpora cardiaca nerve III. In addition, antibody staining revealed that ascending axons of this nerve terminate at the ampullae of the antennal heart forming synaptoid structures and extensive neurohaemal release sites...
September 16, 2017: Journal of Comparative Physiology. A, Neuroethology, Sensory, Neural, and Behavioral Physiology
https://www.readbyqxmd.com/read/28912693/octopamine-underlies-the-counter-regulatory-response-to-a-glucose-deficit-in-honeybees-apis-mellifera
#3
Christina Buckemüller, Oliver Siehler, Josefine Göbel, Richard Zeumer, Anja Ölschläger, Dorothea Eisenhardt
An animal's internal state is a critical parameter required for adaptation to a given environment. An important aspect of an animal's internal state is the energy state that is adjusted to the needs of an animal by energy homeostasis. Glucose is one essential source of energy, especially for the brain. A shortage of glucose therefore triggers a complex response to restore the animal's glucose supply. This counter-regulatory response to a glucose deficit includes metabolic responses like the mobilization of glucose from internal glucose stores and behavioral responses like increased foraging and a rapid intake of food...
2017: Frontiers in Systems Neuroscience
https://www.readbyqxmd.com/read/28878633/the-role-of-monoaminergic-neurotransmission-for-metabolic-control-in-the-fruit-fly-drosophila-melanogaster
#4
Yong Li, Lasse Tiedemann, Jakob von Frieling, Stella Nolte, Samar El-Kholy, Flora Stephano, Christoph Gelhaus, Iris Bruchhaus, Christine Fink, Thomas Roeder
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...
2017: Frontiers in Systems Neuroscience
https://www.readbyqxmd.com/read/28858625/to-fight-or-not-to-fight
#5
Talmo D Pereira, Mala Murthy
In this issue of Neuron, Watanabe et al. (2017) uncover how octopamine, an invertebrate norepinephrine analog, modulates the neural pathways that bias Drosophila males toward aggression.
August 30, 2017: Neuron
https://www.readbyqxmd.com/read/28858617/a-circuit-node-that-integrates-convergent-input-from-neuromodulatory-and-social-behavior-promoting-neurons-to-control-aggression-in-drosophila
#6
Kiichi Watanabe, Hui Chiu, Barret D Pfeiffer, Allan M Wong, Eric D Hoopfer, Gerald M Rubin, David J Anderson
Diffuse neuromodulatory systems such as norepinephrine (NE) control brain-wide states such as arousal, but whether they control complex social behaviors more specifically is not clear. Octopamine (OA), the insect homolog of NE, is known to promote both arousal and aggression. We have performed a systematic, unbiased screen to identify OA receptor-expressing neurons (OARNs) that control aggression in Drosophila. Our results uncover a tiny population of male-specific aSP2 neurons that mediate a specific influence of OA on aggression, independent of any effect on arousal...
August 30, 2017: Neuron
https://www.readbyqxmd.com/read/28822273/ligand-binding-characterization-of-simulated-%C3%AE-adrenergic-like-octopamine-receptor-in-schistocerca-gregaria-via-progressive-structure-simulation
#7
Hui-Meng Lu, Xiao-Li Lu, Jia-Hui Zhai, Ren-Bin Zhou, Yan-Li Qin, Jing-Di Li, Chen-Yan Zhang, Jian-Yu Shi
It is important to design insecticides having both low drug resistance and less undesirable toxicity for desert locust control. Specific GPCRs of Schistocerca gregaria, especially β-adrenergic-like octopamine receptor (SgOctβR), can be considered as its potential effective insecticide targets. However, either the unavailability of SgOctβR's structure or the inadequate capability of its sequence lead the development of insecticide for Schistocerca gregaria meets its plateau. To relax this difficulty, this paper develops a promising progressive structure simulation from SgOctβR's sequence, to its predicted structure of SgOctβR in vacuum, to its conformation as well as its complex with endogenous ligand octopamine in a solvent-membrane system...
July 27, 2017: Journal of Molecular Graphics & Modelling
https://www.readbyqxmd.com/read/28797906/amitraz-and-its-metabolite-modulate-honey-bee-cardiac-function-and-tolerance-to-viral-infection
#8
Scott T O'Neal, Carlyle C Brewster, Jeffrey R Bloomquist, Troy D Anderson
The health and survival of managed honey bee (Apis mellifera) colonies are affected by multiple factors, one of the most important being the interaction between viral pathogens and infestations of the ectoparasitic mite Varroa destructor. Currently, the only effective strategy available for mitigating the impact of viral infections is the chemical control of mite populations. Unfortunately, the use of in-hive acaricides comes at a price, as they can produce sublethal effects that are difficult to quantify, but may ultimately be as damaging as the mites they are used to treat...
August 7, 2017: Journal of Invertebrate Pathology
https://www.readbyqxmd.com/read/28736624/lyme-and-dopaminergic-function-hypothesizing-reduced-reward-deficiency-symptomatology-by-regulating-dopamine-transmission
#9
Kenneth Blum, Edward J Modestino, Marcelo Febo, Bruce Steinberg, Thomas McLaughlin, Lyle Fried, David Baron, David Siwicki, Rajendra D Badgaiyan
The principal vector of Lyme disease in the United States is Ixodes scapularis: black legged or deer ticks. There is increased evidence that those infected may be plagued by anxiety or depression as well. Researchers have identified transcripts coding for two putative cytosolic sulfotransferases in these ticks, which recognized phenolic monoamines as their substrates. It is hypothesized that protracted Lyme disease sequelae may be due to impairment of dopaminergic function of the brain reward circuitry. The subsequent recombinant proteins exhibited sulfotransferase function against two neurotransmitters: dopamine and octopamine...
May 2017: Journal of Systems and Integrative Neuroscience
https://www.readbyqxmd.com/read/28715094/drosophila-mutants-lacking-octopamine-exhibit-impairment-in-aversive-olfactory-associative-learning
#10
Konstantin G Iliadi, Natalia Iliadi, Gabrielle L Boulianne
Octopamine is a biogenic amine in invertebrates that is considered a functional homolog of vertebrate norepinephrine, acting as a neurotransmitter, neuromodulator and neurohormone. Octopamine regulates many physiological processes such as metabolism, reproduction and different types of behaviour including learning and memory. Previous studies in insects led to the notion that acquisition of an olfactory memory depends on the octopaminergic system during appetitive (reward-based) learning, but not in the case of aversive (punishment-based) learning...
July 17, 2017: European Journal of Neuroscience
https://www.readbyqxmd.com/read/28715089/drosophila-mutants-lacking-octopamine-exhibit-impairment-in-aversive-olfactory-associative-learning-commentary-on-iliadi-et%C3%A2-al-2017
#11
Timothy J Mosca
No abstract text is available yet for this article.
July 17, 2017: European Journal of Neuroscience
https://www.readbyqxmd.com/read/28710457/methyl-cpg-binding-domain-proteins-inhibit-interspecies-courtship-and-promote-aggression-in-drosophila
#12
Tarun Gupta, Hannah R Morgan, Jonathan C Andrews, Edmond R Brewer, Sarah J Certel
Reproductive isolation and speciation are driven by the convergence of environmental and genetic variation. The integration of these variation sources is thought to occur through epigenetic marks including DNA methylation. Proteins containing a methyl-CpG-binding domain (MBD) bind methylated DNA and interpret epigenetic marks, providing a dynamic yet evolutionarily adapted cellular output. Here, we report the Drosophila MBD-containing proteins, dMBD-R2 and dMBD2/3, contribute to reproductive isolation and survival behavioral strategies...
July 14, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28701930/biogenic-amines-in-insect-antennae
#13
REVIEW
Marianna I Zhukovskaya, Andrey D Polyanovsky
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...
2017: Frontiers in Systems Neuroscience
https://www.readbyqxmd.com/read/28698386/antagonistic-serotonergic-and-octopaminergic-neural-circuits-mediate-food-dependent-locomotory-behavior-in-caenorhabditis-elegans
#14
Matthew A Churgin, Richard J McCloskey, Emily Peters, Christopher Fang-Yen
Biogenic amines are conserved signaling molecules that link food cues to behavior and metabolism in a wide variety of organisms. In the nematode Caenorhabditis elegans, the biogenic amines serotonin (5-HT) and octopamine regulate a number of food-related behaviors. Using a novel method for long-term quantitative behavioral imaging, we show that 5-HT and octopamine jointly influence locomotor activity and quiescence in feeding and fasting hermaphrodites, and we define the neural circuits through which this modulation occurs...
August 16, 2017: Journal of Neuroscience: the Official Journal of the Society for Neuroscience
https://www.readbyqxmd.com/read/28687927/the-distribution-of-cholinergic-neurons-and-their-co-localization-with-fmrfamide-in-central-and-peripheral-neurons-of-the-spider-cupiennius-salei
#15
Ruth Fabian-Fine, Carly M Anderson, Molly A Roush, Jessica A G Johnson, Hongxia Liu, Andrew S French, Päivi H Torkkeli
The spider Cupiennius salei is a well-established model for investigating information processing in arthropod sensory systems. Immunohistochemistry has shown that several neurotransmitters exist in the C. salei nervous system, including GABA, glutamate, histamine, octopamine and FMRFamide, while electrophysiology has found functional roles for some of these transmitters. There is also evidence that acetylcholine (ACh) is present in some C. salei neurons but information about the distribution of cholinergic neurons in spider nervous systems is limited...
July 7, 2017: Cell and Tissue Research
https://www.readbyqxmd.com/read/28663279/comparative-exploration-of-the-structure-activity-space-of-cloned-%C3%AE-like-octopamine-receptors-from-a-marine-and-a-terrestrial-arthropod
#16
COMPARATIVE STUDY
Dhwanil A Dalwadi, John A Schetz
The α-like octopamine receptors (OctR) are believed to be the evolutionary precursor to the vertebrate α2-adrenergic receptors (α2-ARs) based upon sequence similarity and the ability to interact with norepinephrine and a number of compounds that bind with high affinity to α2-ARs. Barnacles and fruit flies are two prominent model marine and terrestrial representatives of the Arthropoda phylum, and although α-like OctRs have been cloned from Balanus improvisus (BiOctR) and Drosophila melanogaster (DmOctR), little is known about the structure-activity space for these important species...
September 2017: Molecular Pharmacology
https://www.readbyqxmd.com/read/28629966/pharmacological-characterisation-and-functional-roles-for-egg-laying-of-a-%C3%AE-adrenergic-like-octopamine-receptor-in-the-brown-planthopper-nilaparvata-lugens
#17
Shun-Fan Wu, Xiao-Min Jv, Jian Li, Guang-Jian Xu, Xiao-Yi Cai, Cong-Fen Gao
Octopamine, the invertebrate counterpart of adrenaline and noradrenaline, controls and modulates many physiological and behavioral processes in protostomes. It mediates its effects by binding to specific receptors belonging to the superfamily of G-protein coupled receptors. We report the cloning of a cDNA from the brown planthopper (Nloa2b2) sharing high similarity with members of the OA2B2 receptor class. Activation of NlOA2B2 by octopamine increased the production of cAMP in a dose-dependent manner (EC50 = 114 nM)...
August 2017: Insect Biochemistry and Molecular Biology
https://www.readbyqxmd.com/read/28600320/limited-distal-organelles-and-synaptic-function-in-extensive-monoaminergic-innervation
#18
Juan Tao, Dinara Bulgari, David L Deitcher, Edwin S Levitan
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...
August 1, 2017: Journal of Cell Science
https://www.readbyqxmd.com/read/28597098/maximized-complexity-in-miniaturized-brains-morphology-and-distribution-of-octopaminergic-dopaminergic-and-serotonergic-neurons-in-the-parasitic-wasp-trichogramma-evanescens
#19
Emma van der Woude, Hans M Smid
The parasitic wasp, Trichogramma evanescens, is an extremely small insect, with a body length as small as 0.3 mm. To facilitate this miniaturization, their brains may have evolved to contain smaller neural components and/or reduced neural complexity than larger insects. Here, we study whether the size and number of neurons are reduced in the miniaturized brain of T. evanescens, focusing on neurons that express serotonin (5HT), octopamine (OA) and dopamine (DA). We provide the first description of the distribution, projection patterns and number of 5HT-, OA- and DA-like immunoreactive cell bodies in T...
June 9, 2017: Cell and Tissue Research
https://www.readbyqxmd.com/read/28579948/modulation-of-low-voltage-activated-inward-current-permeable-to-sodium-and-calcium-by-darpp-32-drives-spontaneous-firing-of-insect-octopaminergic-neurosecretory-cells
#20
Bruno Lapied, Antoine Defaix, Maria Stankiewicz, Eléonore Moreau, Valérie Raymond
Identification of the different intracellular pathways that control phosphorylation/dephosphorylation process of ionic channels represents an exciting alternative approach for studying the ionic mechanisms underlying neuronal pacemaker activity. In the central nervous system of the cockroach Periplaneta americana, octopaminergic neurons, called dorsal unpaired median (DUM; DUM neurons), generate spontaneous repetitive action potentials. Short-term cultured adult DUM neurons isolated from the terminal abdominal ganglion (TAG) of the nerve cord were used to study the regulation of a tetrodotoxin-sensitive low-voltage-activated (LVA) channel permeable to sodium and calcium (Na/Ca), under whole cell voltage- and current-clamp conditions...
2017: Frontiers in Systems Neuroscience
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