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https://www.readbyqxmd.com/read/28099489/acute-inactivation-of-primary-auditory-cortex-causes-a-sound-localisation-deficit-in-ferrets
#1
Katherine C Wood, Stephen M Town, Huriye Atilgan, Gareth P Jones, Jennifer K Bizley
The objective of this study was to demonstrate the efficacy of acute inactivation of brain areas by cooling in the behaving ferret and to demonstrate that cooling auditory cortex produced a localisation deficit that was specific to auditory stimuli. The effect of cooling on neural activity was measured in anesthetized ferret cortex. The behavioural effect of cooling was determined in a benchmark sound localisation task in which inactivation of primary auditory cortex (A1) is known to impair performance. Cooling strongly suppressed the spontaneous and stimulus-evoked firing rates of cortical neurons when the cooling loop was held at temperatures below 10°C, and this suppression was reversed when the cortical temperature recovered...
2017: PloS One
https://www.readbyqxmd.com/read/28098524/swine-influenza-virus-h1n2-characterization-and-transmission-in-ferrets-chile
#2
Nicolás Bravo-Vasquez, Erik A Karlsson, Pedro Jimenez-Bluhm, Victoria Meliopoulos, Bryan Kaplan, Shauna Marvin, Valerie Cortez, Pamela Freiden, Melinda A Beck, Christopher Hamilton-West, Stacey Schultz-Cherry
Phylogenetic analysis of the influenza hemagglutinin gene (HA) has suggested that commercial pigs in Chile harbor unique human seasonal H1-like influenza viruses, but further information, including characterization of these viruses, was unavailable. We isolated influenza virus (H1N2) from a swine in a backyard production farm in Central Chile and demonstrated that the HA gene was identical to that in a previous report. Its HA and neuraminidase genes were most similar to human H1 and N2 viruses from the early 1990s and internal segments were similar to influenza A(H1N1)pdm09 virus...
February 2017: Emerging Infectious Diseases
https://www.readbyqxmd.com/read/28069921/visual-stimulus-speed-does-not-influence-the-rapid-emergence-of-direction-selectivity-in-ferret-visual-cortex
#3
Neil J Ritter, Nora M Anderson, Stephen D Van Hooser
: Sensory experience is necessary for the development of some receptive field properties of neurons in primary sensory cortical areas. However, it remains unclear whether the parameters of an individual animal's experience play an instructive role and influence the tuning parameters of cortical sensory neurons as selectivity emerges, or rather if experience merely permits the completion of processes that are fully seeded at the onset of experience. Here we have examined whether the speed of visual stimuli that are presented to visually naïve ferrets can influence the parameters of speed tuning and direction selectivity in cortical neurons...
January 9, 2017: Journal of Neuroscience: the Official Journal of the Society for Neuroscience
https://www.readbyqxmd.com/read/28040019/relative-salience-of-spectral-and-temporal-features-in-auditory-long-term-memory
#4
Pingbo Yin, Shihab A Shamma, Jonathan B Fritz
In order to explore the representation of sound features in auditory long-term memory, two groups of ferrets were trained on Go vs Nogo, 3-zone classification tasks. The sound stimuli differed primarily along the spectral and temporal dimensions. In Group 1, two ferrets were trained to (i) classify tones based on their frequency (Tone-task), and subsequently learned to (ii) classify white noise based on its amplitude modulation rate (AM-task). In Group 2, two ferrets were trained to classify tones based on correlated combinations of their frequency and AM rate (AM-Tone task)...
December 2016: Journal of the Acoustical Society of America
https://www.readbyqxmd.com/read/28038412/enhanced-virulence-of-clade-2-3-2-1-highly-pathogenic-avian-influenza-a-h5n1-viruses-in-ferrets
#5
Melissa B Pearce, Claudia Pappas, Kortney M Gustin, C Todd Davis, Mary J Pantin-Jackwood, David E Swayne, Taronna R Maines, Jessica A Belser, Terrence M Tumpey
Sporadic avian to human transmission of highly pathogenic avian influenza (HPAI) A(H5N1) viruses necessitates the analysis of currently circulating and evolving clades to assess their potential risk. Following the spread and sustained circulation of clade 2 viruses across multiple continents, numerous subclades and genotypes have been described. To better understand the pathogenesis associated with the continued diversification of clade 2A(H5N1) influenza viruses, we investigated the relative virulence of eleven human and poultry isolates collected from 2006 to 2013 by determining their ability to cause disease in the ferret model...
December 27, 2016: Virology
https://www.readbyqxmd.com/read/28034455/proliferative-enteropathy-caused-by-lawsonia-intracellularis-in-chickens
#6
T Ohta, K Kimura, K Katsuda, H Kobayashi, O Mikami, M Haritani, T Onodera
Proliferative enteropathy (PE) is an infectious disease caused by Lawsonia intracellularis (Li), an obligate intracellular bacterium. PE is endemic in swine herds and has been reported in a variety of mammals including horses, hamsters, rabbits, rats, guinea pigs, ferrets, foxes, dogs, sheep, deer and non-human primates. Avian cases are reported only in ratite birds, including emus and ostriches. Some studies show an absence of Lawsonia spp. infection in chickens. In this study, we performed morphological and bacteriological examinations on the intestines of two broiler chickens that had been condemned at a poultry slaughter plant in Japan due to intestinal haemorrhage, which was a result of focal coccidial enteritis...
December 26, 2016: Journal of Comparative Pathology
https://www.readbyqxmd.com/read/28017661/recent-h3n2-viruses-have-evolved-specificity-for-extended-branched-human-type-receptors-conferring-potential-for-increased-avidity
#7
Wenjie Peng, Robert P de Vries, Oliver C Grant, Andrew J Thompson, Ryan McBride, Buyankhishig Tsogtbaatar, Peter S Lee, Nahid Razi, Ian A Wilson, Robert J Woods, James C Paulson
Human and avian influenza viruses recognize different sialic acid-containing receptors, referred to as human-type (NeuAcα2-6Gal) and avian-type (NeuAcα2-3Gal), respectively. This presents a species barrier for aerosol droplet transmission of avian viruses in humans and ferrets. Recent reports have suggested that current human H3N2 viruses no longer have strict specificity toward human-type receptors. Using an influenza receptor glycan microarray with extended airway glycans, we find that H3N2 viruses have in fact maintained human-type specificity, but they have evolved preference for a subset of receptors comprising branched glycans with extended poly-N-acetyl-lactosamine (poly-LacNAc) chains, a specificity shared with the 2009 pandemic H1N1 (Cal/04) hemagglutinin...
January 11, 2017: Cell Host & Microbe
https://www.readbyqxmd.com/read/28003481/shifting-clade-distribution-reassortment-and-emergence-of-new-subtypes-of-highly-pathogenic-avian-influenza-a-h5-viruses-collected-in-vietnamese-poultry-from-2012-to-2015
#8
Diep T Nguyen, Yunho Jang, Tho D Nguyen, Joyce Jones, Samuel S Shepard, Hua Yang, Nancy Gerloff, Thomas Fabrizio, Long V Nguyen, Ken Inui, Genyan Yang, Adrian Creanga, Li Wang, Duong T Mai, Sharmi Thor, James Stevens, Thanh L To, David E Wentworth, Tung Nguyen, Dong V Pham, Juliet E Bryant, C Todd Davis
: Whole genome sequences of representative highly pathogenic avian influenza A(H5) viruses from Vietnam were generated, comprising samples from poultry outbreaks and active market surveillance collected from January 2012 to August 2015. Six hemagglutinin gene clades were characterized. Clade 1.1.2 was predominant in southern Mekong provinces throughout 2012 and 2013, but gradually disappeared and was not detected after April 2014. Clade 2.3.2.1c viruses spread rapidly during 2012 and were detected in the south and center of the country...
December 21, 2016: Journal of Virology
https://www.readbyqxmd.com/read/27997342/evaluation-of-a-candidate-live-attenuated-influenza-vaccine-prepared-in-changchun-bcht-china-for-safety-and-efficacy-in-ferrets
#9
Zhenwei Shen, Richard A Bowen, Peng Ge, Jinfei Yu, Yanjie Shen, Wei Kong, Chunlai Jiang, Jinchang Wu, Changlin Zhu, Yanjun Xu, Wei Wei, Larisa Rudenko, Irina Kiseleva, Fei Xu
We evaluated the safety and efficacy of a live attenuated influenza vaccine (LAIV) product in ferrets. The BCHT LAIV product was significantly less virulent than wild-type H1N1 virus, when evaluated by comparing virus shedding and histopathologic lesions. The data indicated strong evidence for an attenuated phenotype of LAIV. Furthermore, the vaccine induced robust humoral immune responses in seronegative ferrets, and protected ferrets against development of fever, weight loss and turbinate inflammatory lesions after challenging with H3N2 wide-type influenza virus...
November 21, 2016: Vaccine
https://www.readbyqxmd.com/read/27983773/exploiting-interspecific-olfactory-communication-to-monitor-predators
#10
Patrick M Garvey, Alistair S Glen, Mick N Clout, Sarah V Wyse, Margaret Nichols, Roger P Pech
Olfaction is the primary sense of many mammals and subordinate predators use this sense to detect dominant species, thereby reducing the risk of an encounter and facilitating co-existence. Chemical signals can act as repellents or attractants and may therefore have applications for wildlife management. We devised a field experiment to investigate whether dominant predator (ferret Mustela furo) body odour would alter the behaviour of three common mesopredators: stoats (M. erminea), hedgehogs (Erinaceus europaeus), and ship rats (Rattus rattus)...
December 16, 2016: Ecological Applications: a Publication of the Ecological Society of America
https://www.readbyqxmd.com/read/27977811/large-scale-phylogenomic-analysis-reveals-the-complex-evolutionary-history-of-rabies-virus-in-multiple-carnivore-hosts
#11
Cécile Troupin, Laurent Dacheux, Marion Tanguy, Claude Sabeta, Hervé Blanc, Christiane Bouchier, Marco Vignuzzi, Sebastián Duchene, Edward C Holmes, Hervé Bourhy
The natural evolution of rabies virus (RABV) provides a potent example of multiple host shifts and an important opportunity to determine the mechanisms that underpin viral emergence. Using 321 genome sequences spanning an unprecedented diversity of RABV, we compared evolutionary rates and selection pressures in viruses sampled from multiple primary host shifts that occurred on various continents. Two major phylogenetic groups, bat-related RABV and dog-related RABV, experiencing markedly different evolutionary dynamics were identified...
December 2016: PLoS Pathogens
https://www.readbyqxmd.com/read/27934767/generation-of-influenza-a-viruses-as-live-but-replication-incompetent-virus-vaccines
#12
Longlong Si, Huan Xu, Xueying Zhou, Ziwei Zhang, Zhenyu Tian, Yan Wang, Yiming Wu, Bo Zhang, Zhenlan Niu, Chuanling Zhang, Ge Fu, Sulong Xiao, Qing Xia, Lihe Zhang, Demin Zhou
The conversion of life-threatening viruses into live but avirulent vaccines represents a revolution in vaccinology. In a proof-of-principle study, we expanded the genetic code of the genome of influenza A virus via a transgenic cell line containing orthogonal translation machinery. This generated premature termination codon (PTC)-harboring viruses that exerted full infectivity but were replication-incompetent in conventional cells. Genome-wide optimization of the sites for incorporation of multiple PTCs resulted in highly reproductive and genetically stable progeny viruses in transgenic cells...
December 2, 2016: Science
https://www.readbyqxmd.com/read/27933293/differences-in-the-mechanical-properties-of-the-developing-cerebral-cortical-proliferative-zone-between-mice-and-ferrets-at-both-the-tissue-and-single-cell-levels
#13
Arata Nagasaka, Tomoyasu Shinoda, Takumi Kawaue, Makoto Suzuki, Kazuaki Nagayama, Takeo Matsumoto, Naoto Ueno, Ayano Kawaguchi, Takaki Miyata
Cell-producing events in developing tissues are mechanically dynamic throughout the cell cycle. In many epithelial systems, cells are apicobasally tall, with nuclei and somata that adopt different apicobasal positions because nuclei and somata move in a cell cycle-dependent manner. This movement is apical during G2 phase and basal during G1 phase, whereas mitosis occurs at the apical surface. These movements are collectively referred to as interkinetic nuclear migration, and such epithelia are called "pseudostratified...
2016: Frontiers in Cell and Developmental Biology
https://www.readbyqxmd.com/read/27930944/high-throughput-sequencing-in-acute-lymphoblastic-leukemia-follow-up-of-minimal-residual-disease-and-emergence-of-new-clones
#14
Mikaël Salson, Mathieu Giraud, Aurélie Caillault, Nathalie Grardel, Nicolas Duployez, Yann Ferret, Marc Duez, Ryan Herbert, Tatiana Rocher, Shéhérazade Sebda, Sabine Quief, Céline Villenet, Martin Figeac, Claude Preudhomme
Minimal residual disease (MRD) is known to be an independent prognostic factor in patients with acute lymphoblastic leukemia (ALL). High-throughput sequencing (HTS) is currently used in routine practice for the diagnosis and follow-up of patients with hematological neoplasms. In this retrospective study, we examined the role of immunoglobulin/T-cell receptor-based MRD in patients with ALL by HTS analysis of immunoglobulin H and/or T-cell receptor gamma chain loci in bone marrow samples from 11 patients with ALL, at diagnosis and during follow-up...
November 21, 2016: Leukemia Research
https://www.readbyqxmd.com/read/27927954/predictive-ensemble-decoding-of-acoustical-features-explains-context-dependent-receptive-fields
#15
Izzet B Yildiz, Nima Mesgarani, Sophie Deneve
: A primary goal of auditory neuroscience is to identify the sound features extracted and represented by auditory neurons. Linear encoding models, which describe neural responses as a function of the stimulus, have been primarily used for this purpose. Here, we provide theoretical arguments and experimental evidence in support of an alternative approach, based on decoding the stimulus from the neural response. We used a Bayesian normative approach to predict the responses of neurons detecting relevant auditory features, despite ambiguities and noise...
December 7, 2016: Journal of Neuroscience: the Official Journal of the Society for Neuroscience
https://www.readbyqxmd.com/read/27922116/risk-assessment-of-recent-egyptian-h5n1-influenza-viruses
#16
A-S Arafa, S Yamada, M Imai, T Watanabe, S Yamayoshi, K Iwatsuki-Horimoto, M Kiso, Y Sakai-Tagawa, M Ito, T Imamura, N Nakajima, K Takahashi, D Zhao, K Oishi, A Yasuhara, C A Macken, G Zhong, A P Hanson, S Fan, J Ping, M Hatta, T J S Lopes, Y Suzuki, M El-Husseiny, A Selim, N Hagag, M Soliman, G Neumann, H Hasegawa, Y Kawaoka
Highly pathogenic avian influenza (HPAI) viruses of the H5N1 subtype are enzootic in poultry populations in different parts of the world, and have caused numerous human infections in recent years, particularly in Egypt. However, no sustained human-to-human transmission of these viruses has yet been reported. We tested nine naturally occurring Egyptian H5N1 viruses (isolated in 2014-2015) in ferrets and found that three of them transmitted via respiratory droplets, causing a fatal infection in one of the exposed animals...
December 6, 2016: Scientific Reports
https://www.readbyqxmd.com/read/27919252/neoplastic-diseases-in-the-domestic-ferret-mustela-putorius-furo-in-italy-classification-and-tissue-distribution-of-856-cases-2000-2010
#17
Giancarlo Avallone, Annalisa Forlani, Marco Tecilla, Elena Riccardi, Sara Belluco, Sara Francesca Santagostino, Guido Grilli, Kiumars Khadivi, Paola Roccabianca
BACKGROUND: The aim of this study was to describe the prevalence and tissue distribution of neoplasms in Italian ferrets, compared to the epidemiological data previously reported in USA and Japan. METHODS: Signalment and diagnoses of pathological submissions received between 2000 and 2010 were searched; cases with the diagnosis of neoplasm were selected and original sections reviewed to confirm the diagnosis. RESULTS: Nine-hundred and ten samples were retrieved, 690 of which included at least one tumour for a total of 856 tumours...
December 5, 2016: BMC Veterinary Research
https://www.readbyqxmd.com/read/27908639/animal-models-of-respiratory-syncytial-virus-infection
#18
Geraldine Taylor
Human respiratory syncytial virus (hRSV) is a major cause of respiratory disease and hospitalisation of infants, worldwide, and is also responsible for significant morbidity in adults and excess deaths in the elderly. There is no licensed hRSV vaccine or effective therapeutic agent. However, there are a growing number of hRSV vaccine candidates that have been developed targeting different populations at risk of hRSV infection. Animal models of hRSV play an important role in the preclinical testing of hRSV vaccine candidates and although many have shown efficacy in preclinical studies, few have progressed to clinical trials or they have had only limited success...
January 11, 2017: Vaccine
https://www.readbyqxmd.com/read/27893810/antiviral-efficacy-of-verdinexor-in-vivo-in-two-animal-models-of-influenza-a-virus-infection
#19
Olivia Perwitasari, Scott Johnson, Xiuzhen Yan, Emery Register, Jackelyn Crabtree, Jon Gabbard, Elizabeth Howerth, Sharon Shacham, Robert Carlson, Sharon Tamir, Ralph A Tripp
Influenza A virus (IAV) causes seasonal epidemics of respiratory illness that can cause mild to severe illness and potentially death. Antiviral drugs are an important countermeasure against IAV; however, drug resistance has developed, thus new therapeutic approaches are being sought. Previously, we demonstrated the antiviral activity of a novel nuclear export inhibitor drug, verdinexor, to reduce influenza replication in vitro and pulmonary virus burden in mice. In this study, in vivo efficacy of verdinexor was further evaluated in two animal models or influenza virus infection, mice and ferrets...
2016: PloS One
https://www.readbyqxmd.com/read/27892925/a-mouse-model-for-mers-coronavirus-induced-acute-respiratory-distress-syndrome
#20
Adam S Cockrell, Boyd L Yount, Trevor Scobey, Kara Jensen, Madeline Douglas, Anne Beall, Xian-Chun Tang, Wayne A Marasco, Mark T Heise, Ralph S Baric
Middle East respiratory syndrome coronavirus (MERS-CoV) is a novel virus that emerged in 2012, causing acute respiratory distress syndrome (ARDS), severe pneumonia-like symptoms and multi-organ failure, with a case fatality rate of ∼36%. Limited clinical studies indicate that humans infected with MERS-CoV exhibit pathology consistent with the late stages of ARDS, which is reminiscent of the disease observed in patients infected with severe acute respiratory syndrome coronavirus. Models of MERS-CoV-induced severe respiratory disease have been difficult to achieve, and small-animal models traditionally used to investigate viral pathogenesis (mouse, hamster, guinea-pig and ferret) are naturally resistant to MERS-CoV...
November 28, 2016: Nature Microbiology
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