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Kenyon cells

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https://www.readbyqxmd.com/read/29742029/nitric-oxide-augments-single-persistent-na-channel-currents-via-the-cgmp-pkg-signaling-pathway-in-kenyon-cells-isolated-from-the-cricket-mushroom-bodies
#1
Mariko Ikeda, Masami Yoshino
The nitric oxide (NO)/cyclic GMP signaling pathway has been suggested to be important in the formation of olfactory memory in insects. However, the molecular targets of the NO signaling cascade in the central neurons associated with olfactory learning and memory have not been fully analyzed. In this study, we investigated the effects of NO donors on single voltage-dependent Na+ channels in intrinsic neurons, called Kenyon cells, in the mushroom bodies in the brain of the cricket. Step depolarization on cell-attached patch membranes induces single-channel currents with fast-activating and -inactivating brief openings at the beginning of the voltage steps followed by more persistently recurring brief openings all along the 150-ms pulses...
May 9, 2018: Journal of Neurophysiology
https://www.readbyqxmd.com/read/29718508/expression-characterization-and-localization-of-the-foraging-gene-in-the-chinese-bee-apis-cerana-cerana-hymenoptera-apidae
#2
WeiHua Ma, YuSuo Jiang, Jiao Meng, HuiTing Zhao, HuaiLei Song, JinShan Shen
In social insects, the foraging gene (for) regulates insect age- and task-based foraging behaviors. We studied the expression and localization of the for gene (Acfor) in Apis cerana cerana workers to explore whether the differential regulation of this gene is associated with the behaviors of nurses and foragers. The expression profiles of Acfor in different tissues and at different ages were examined using real-time quantitative reverse transcription polymerase chain reaction. Cellular localization in the brain was detected using in situ hybridization...
March 1, 2018: Journal of Insect Science
https://www.readbyqxmd.com/read/29706545/dendritic-integration-of-sensory-evidence-in-perceptual-decision-making
#3
Lukas N Groschner, Laura Chan Wah Hak, Rafal Bogacz, Shamik DasGupta, Gero Miesenböck
Perceptual decisions require the accumulation of sensory information to a response criterion. Most accounts of how the brain performs this process of temporal integration have focused on evolving patterns of spiking activity. We report that subthreshold changes in membrane voltage can represent accumulating evidence before a choice. αβ core Kenyon cells (αβc KCs) in the mushroom bodies of fruit flies integrate odor-evoked synaptic inputs to action potential threshold at timescales matching the speed of olfactory discrimination...
April 25, 2018: Cell
https://www.readbyqxmd.com/read/29703864/farnesyltransferase-inhibition-exacerbates-eosinophilic-inflammation-and-airway-hyperreactivity-in-mice-with-experimental-asthma-the-complex-roles-of-ras-gtpase-and-farnesylpyrophosphate-in-type-2-allergic-inflammation
#4
Jennifer M Bratt, Kevin Y Chang, Michelle Rabowsky, Lisa M Franzi, Sean P Ott, Simone Filosto, Tzipora Goldkorn, Muhammad Arif, Jerold A Last, Nicholas J Kenyon, Amir A Zeki
Ras, a small GTPase protein, is thought to mediate Th2-dependent eosinophilic inflammation in asthma. Ras requires cell membrane association for its biological activity, and this requires the posttranslational modification of Ras with an isoprenyl group by farnesyltransferase (FTase) or geranylgeranyltransferase (GGTase). We hypothesized that inhibition of FTase using FTase inhibitor (FTI)-277 would attenuate allergic asthma by depleting membrane-associated Ras. We used the OVA mouse model of allergic inflammation and human airway epithelial (HBE1) cells to determine the role of FTase in inflammatory cell recruitment...
April 27, 2018: Journal of Immunology: Official Journal of the American Association of Immunologists
https://www.readbyqxmd.com/read/29676203/-5p-and-3p-strands-of-mir-145-and-mir-140-during-mesenchymal-stem-cell-chondrogenic-differentiation
#5
Jonathan D Kenyon, Olga Sergeeva, Rodrigo A Somoza, Ming Li, Arnold I Caplan, Ahmad M Khalil, Zhenghong Lee
The chondrogenic differentiation of mesenchymal stem cells (MSCs) is mediated by transcription factors and small non-coding RNAs such as micro-RNAs (miRNAs). Each miRNA is initially transcribed as a long transcript, which matures to produce -5p and -3p strands. It is widely believed that the mature and functional miRNA from any given pre-miRNA, usually the -5p strand, is functional, while the opposing -3p strand is degraded. However, recent cartilage literature started to show functional -3p stands for a few miRNAs...
April 20, 2018: Tissue Engineering. Part A
https://www.readbyqxmd.com/read/29666124/generation-of-a-double-binary-transgenic-zebrafish-model-to-study-myeloid-gene-regulation-in-response-to-oncogene-activation-in-melanocytes
#6
Amy Kenyon, Daria Gavriouchkina, Jernej Zorman, Vanessa Chong-Morrison, Giorgio Napolitani, Vincenzo Cerundolo, Tatjana Sauka-Spengler
A complex network of inflammatory genes is closely linked to somatic cell transformation and malignant disease. Immune cells and their associated molecules are responsible for detecting and eliminating cancer cells as they establish themselves as the precursors of a tumour. By the time a patient has a detectable solid tumour, cancer cells have escaped the initial immune response mechanisms. Here, we describe the development of a double binary zebrafish model that enables regulatory programming of the myeloid cells as they respond to oncogene-activated melanocytes to be explored, focussing on the initial phase when cells become the precursors of cancer...
April 6, 2018: Disease Models & Mechanisms
https://www.readbyqxmd.com/read/29643770/neural-control-of-startle-induced-locomotion-by-the-mushroom-bodies-and-associated-neurons-in-drosophila
#7
Jun Sun, An Qi Xu, Julia Giraud, Haiko Poppinga, Thomas Riemensperger, André Fiala, Serge Birman
Startle-induced locomotion is commonly used in Drosophila research to monitor locomotor reactivity and its progressive decline with age or under various neuropathological conditions. A widely used paradigm is startle-induced negative geotaxis (SING), in which flies entrapped in a narrow column react to a gentle mechanical shock by climbing rapidly upwards. Here we combined in vivo manipulation of neuronal activity and splitGFP reconstitution across cells to search for brain neurons and putative circuits that regulate this behavior...
2018: Frontiers in Systems Neuroscience
https://www.readbyqxmd.com/read/29547121/-drosophila-mushroom-bodies-integrate-hunger-and-satiety-signals-to-control-innate-food-seeking-behavior
#8
Chang-Hui Tsao, Chien-Chun Chen, Chen-Han Lin, Hao-Yu Yang, Suewei Lin
The fruit fly can evaluate its energy state and decide whether to pursue food-related cues. Here, we reveal that the mushroom body (MB) integrates hunger and satiety signals to control food-seeking behavior. We have discovered five pathways in the MB essential for hungry flies to locate and approach food. Blocking the MB-intrinsic Kenyon cells (KCs) and the MB output neurons (MBONs) in these pathways impairs food-seeking behavior. Starvation bi-directionally modulates MBON responses to a food odor, suggesting that hunger and satiety controls occur at the KC-to-MBON synapses...
March 16, 2018: ELife
https://www.readbyqxmd.com/read/29540207/an-rna-binding-compound-that-stabilizes-the-hiv-1-grna-packaging-signal-structure-and-specifically-blocks-hiv-1-rna-encapsidation
#9
Carin K Ingemarsdotter, Jingwei Zeng, Ziqi Long, Andrew M L Lever, Julia C Kenyon
BACKGROUND: NSC260594, a quinolinium derivative from the NCI diversity set II compound library, was previously identified in a target-based assay as an inhibitor of the interaction between the HIV-1 (ψ) stem-loop 3 (SL3) RNA and Gag. This compound was shown to exhibit potent antiviral activity. Here, the effects of this compound on individual stages of the viral lifecycle were examined by qRT-PCR, ELISA and Western blot, to see if its actions were specific to the viral packaging stage...
March 14, 2018: Retrovirology
https://www.readbyqxmd.com/read/29514065/paracrine-interactions-within-the-pancreatic-islet-determine-the-glycemic-set-point
#10
Rayner Rodriguez-Diaz, R Damaris Molano, Jonathan R Weitz, Midhat H Abdulreda, Dora M Berman, Barbara Leibiger, Ingo B Leibiger, Norma S Kenyon, Camillo Ricordi, Antonello Pileggi, Alejandro Caicedo, Per-Olof Berggren
Every animal species has a signature blood glucose level or glycemic set point. These set points are different, and the normal glycemic levels (normoglycemia) of one species would be life threatening for other species. Mouse normoglycemia can be considered diabetic for humans. The biological determinants of the glycemic set point remain unclear. Here we show that the pancreatic islet imposes its glycemic set point on the organism, making it the bona fide glucostat in the body. Moreover, and in contrast to rodent islets, glucagon input from the alpha cell to the insulin-secreting beta cell is necessary to fine-tune the distinctive human set point...
March 6, 2018: Cell Metabolism
https://www.readbyqxmd.com/read/29449372/ligand-mediated-protein-degradation-reveals-functional-conservation-among-sequence-variants-of-the-cul4-type-e3-ligase-substrate-receptor-cereblon
#11
Afua A Akuffo, Aileen Y Alontaga, Rainer Metcalf, Matthew S Beatty, Andreas Becker, Jessica M McDaniel, Rebecca S Hesterberg, William E Goodheart, Steven Gunawan, Muhammad Ayaz, Yan Yang, Md Rezaul Karim, Morgan E Orobello, Kenyon Daniel, Wayne Guida, Jeffrey A Yoder, Anjali M Rajadhyaksha, Ernst Schönbrunn, Harshani R Lawrence, Nicholas J Lawrence, Pearlie K Epling-Burnette
Upon binding to thalidomide and other immunomodulatory drugs, the E3 ligase substrate receptor cereblon (CRBN) promotes proteosomal destruction by engaging the DDB1-CUL4A-Roc1-RBX1 E3 ubiquitin ligase in human cells but not in mouse cells, suggesting that sequence variations in CRBN may cause its inactivation. Therapeutically, CRBN engagers have the potential for broad applications in cancer and immune therapy by specifically reducing protein expression through targeted ubiquitin-mediated degradation. To examine the effects of defined sequence changes on CRBN's activity, we performed a comprehensive study using complementary theoretical, biophysical, and biological assays aimed at understanding CRBN's nonprimate sequence variations...
April 20, 2018: Journal of Biological Chemistry
https://www.readbyqxmd.com/read/29428908/molecular-cloning-and-expression-analysis-of-the-tyramine-br-receptor-genes-in-apis-cerana-cerana
#12
Li-Zhen Zhang, Yong Zhang, Jing-Hua Hu, Zi-Long Wang, Zhi-Jiang Zeng
Tyramine is a biological polyamine, which serves important functions as neurotransmitters, neuromodulators and neurohormone of the central nervous system. It participates in the regulation of various behavior and physiological processes in insects. For example, tyramine and its receptor genes are involved in the regulation of learning and memory in the animals. In this study, the full-length cDNA sequences of the tyramine receptor genes (Actyr1 and Actyr2) of the Chinese honeybee, Apis cerana cerana, were cloned and sequenced for the first time...
February 20, 2018: Yi Chuan, Hereditas
https://www.readbyqxmd.com/read/29412158/allogeneic-hematopoietic-stem-cell-transplantation-for-gata2-deficiency-using-a-busulfan-based-regimen
#13
Mark Parta, Nirali N Shah, Kristin Baird, Hind Rafei, Katherine R Calvo, Thomas Hughes, Kristen Cole, Meg Kenyon, Bazetta Blacklock Schuver, Jennifer Cuellar-Rodriguez, Christa S Zerbe, Steven M Holland, Dennis D Hickstein
Allogeneic hematopoietic stem cell transplantation (HSCT) reverses the bone marrow failure syndrome due to GATA2 deficiency. The intensity of conditioning required to achieve reliable engraftment and prevent relapse remains unclear. Here, we describe the results of a prospective study of HSCT in 22 patients with GATA2 deficiency using a busulfan-based conditioning regimen. The study included 2 matched related donor (MRD) recipients, 13 matched unrelated donor (URD) recipients, and 7 haploidentical related donor (HRD) recipients...
February 3, 2018: Biology of Blood and Marrow Transplantation
https://www.readbyqxmd.com/read/29351552/in-situ-recording-of-ionic-currents-in-projection-neurons-and-kenyon-cells-in-the-olfactory-pathway-of-the-honeybee
#14
Jan Kropf, Wolfgang Rössler
The honeybee olfactory pathway comprises an intriguing pattern of convergence and divergence: ~60.000 olfactory sensory neurons (OSN) convey olfactory information on ~900 projection neurons (PN) in the antennal lobe (AL). To transmit this information reliably, PNs employ relatively high spiking frequencies with complex patterns. PNs project via a dual olfactory pathway to the mushroom bodies (MB). This pathway comprises the medial (m-ALT) and the lateral antennal lobe tract (l-ALT). PNs from both tracts transmit information from a wide range of similar odors, but with distinct differences in coding properties...
2018: PloS One
https://www.readbyqxmd.com/read/29334362/investigation-of-resistance-switching-in-sio-x-rram-cells-using-a-3d-multi-scale-kinetic-monte-carlo-simulator
#15
Toufik Sadi, Adnan Mehonic, Luca Montesi, Mark Buckwell, Anthony Kenyon, Asen Asenov
We employ an advanced three-dimensional (3D) electro-thermal simulator to explore the physics and potential of oxide-based resistive random-access memory (RRAM) cells. The physical simulation model has been developed recently, and couples a kinetic Monte Carlo study of electron and ionic transport to the self-heating phenomenon while accounting carefully for the physics of vacancy generation and recombination, and trapping mechanisms. The simulation framework successfully captures resistance switching, including the electroforming, set and reset processes, by modeling the dynamics of conductive filaments in the 3D space...
February 28, 2018: Journal of Physics. Condensed Matter: An Institute of Physics Journal
https://www.readbyqxmd.com/read/29168500/a-lysosomal-switch-triggers-proteostasis-renewal-in-the-immortal-c-elegans-germ-lineage
#16
K Adam Bohnert, Cynthia Kenyon
Although individuals age and die with time, an animal species can continue indefinitely, because of its immortal germ-cell lineage. How the germline avoids transmitting damage from one generation to the next remains a fundamental question in biology. Here we identify a lysosomal switch that enhances germline proteostasis before fertilization. We find that Caenorhabditis elegans oocytes whose maturation is arrested by the absence of sperm exhibit hallmarks of proteostasis collapse, including protein aggregation...
November 30, 2017: Nature
https://www.readbyqxmd.com/read/29164168/aids-related-endemic-mycoses-in-western-cape-south-africa-and-clinical-mimics-a-cross-sectional-study-of-adults-with-advanced-hiv-and-recent-onset-widespread-skin-lesions
#17
Ilan S Schwartz, Chris Kenyon, Rannakoe Lehloenya, Saskya Claasens, Zandile Spengane, Hans Prozesky, Rosie Burton, Arifa Parker, Sean Wasserman, Graeme Meintjes, Marc Mendelson, Jantjie Taljaard, Johann W Schneider, Natalie Beylis, Bonnie Maloba, Nelesh P Govender, Robert Colebunders, Sipho Dlamini
Background: Skin lesions are common in advanced HIV infection and are sometimes caused by serious diseases like systemic mycoses (SM). AIDS-related SM endemic to Western Cape, South Africa, include emergomycosis (formerly disseminated emmonsiosis), histoplasmosis, and sporotrichosis. We previously reported that 95% of patients with AIDS-related emergomycosis had skin lesions, although these were frequently overlooked or misdiagnosed clinically. Prospective studies are needed to characterize skin lesions of SM in South Africa and to help distinguish these from common HIV-related dermatoses...
2017: Open Forum Infectious Diseases
https://www.readbyqxmd.com/read/29135604/chemical-burns-of-the-eye-the-role-of-retinal-injury-and-new-therapeutic-possibilities
#18
Claes H Dohlman, Fabiano Cade, Caio V Regatieri, Chengxin Zhou, Fengyang Lei, Alja Crnej, Mona Harissi-Dagher, Marie-Claude Robert, George N Papaliodis, Dongfeng Chen, James V Aquavella, Esen K Akpek, Anthony J Aldave, Kimberly C Sippel, Donald J DʼAmico, Jan G Dohlman, Per Fagerholm, Liqiang Wang, Lucy Q Shen, Miguel González-Andrades, James Chodosh, Kenneth R Kenyon, C Stephen Foster, Roberto Pineda, Samir Melki, Kathryn A Colby, Joseph B Ciolino, Demetrios G Vavvas, Shigeru Kinoshita, Reza Dana, Eleftherios I Paschalis
PURPOSE: To propose a new treatment paradigm for chemical burns to the eye - in the acute and chronic phases. METHODS: Recent laboratory and clinical data on the biology and treatment of chemical burns are analyzed. RESULTS: Corneal blindness from chemical burns can now be successfully treated with a keratoprosthesis, on immediate and intermediate bases. Long term outcomes, however, are hampered by early retinal damage causing glaucoma. New data suggest that rapid diffusion of inflammatory cytokines posteriorly (TNF-α, etc) can severely damage the ganglion cells...
February 2018: Cornea
https://www.readbyqxmd.com/read/29127660/exposure-to-a-sublethal-concentration-of-imidacloprid-and-the-side-effects-on-target-and-nontarget-organs-of-apis-mellifera-hymenoptera-apidae
#19
Aline Fernanda Catae, Thaisa Cristina Roat, Marcel Pratavieira, Anally Ribeiro da Silva Menegasso, Mario Sergio Palma, Osmar Malaspina
The use of insecticides has become increasingly frequent, and studies indicate that these compounds are involved in the intoxication of bees. Imidacloprid is a widely used neonicotinoid; thus, we have highlighted the importance of assessing its oral toxicity to Africanized bees and used transmission electron microscopy to investigate the sublethal effects in the brain, the target organ, and the midgut, responsible for the digestion/absorption of food. In addition, the distribution of proteins involved in important biological processes in the brain were evaluated on the 1st day of exposure by MALDI-imaging analysis...
March 2018: Ecotoxicology
https://www.readbyqxmd.com/read/29123029/phenotypic-dissection-of-the-mouse-ren1d-knockout-by-complementation-with-human-renin
#20
Charlotte Buckley, Robert J Nelson, Linda J Mullins, Matthew G F Sharp, Stewart Fleming, Christopher J Kenyon, Sabrina Semprini, Dominik Steppan, Janos Peti-Peterdi, Armin Kurtz, Helen Christian, John J Mullins
Normal renin synthesis and secretion is important for the maintenance of juxtaglomerular apparatus architecture. Mice lacking a functional Ren1d gene are devoid of renal juxtaglomerular cell granules and exhibit an altered macula densa morphology. Due to the species-specificity of renin activity, transgenic mice are ideal models for experimentally investigating and manipulating expression patterns of the human renin gene in a native cellular environment without confounding renin-angiotensin system interactions...
January 26, 2018: Journal of Biological Chemistry
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