keyword
MENU ▼
Read by QxMD icon Read
search

neuraminidase

keyword
https://www.readbyqxmd.com/read/28098524/swine-influenza-virus-h1n2-characterization-and-transmission-in-ferrets-chile
#1
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/28096183/pneumococcal-neuraminidase-a-nana-promotes-biofilm-formation-and-synergizes-with-influenza-a-virus-in-nasal-colonization-and-middle-ear-infection
#2
John T Wren, Lance K Blevins, Bing Pang, Ankita Basu Roy, Melissa B Oliver, Jennifer L Reimche, Jessie E Wozniak, Martha A Alexander-Miller, W Edward Swords
Even in the vaccine era, Streptococcus pneumoniae (pneumococcus) remains a leading cause of otitis media, a significant public health burden, in large because of its high prevalence of nasal colonization in children. The primary pneumococcal neuraminidase NanA, which is a sialidase that catalyzes the cleavage of terminal sialic acids from host glycoconjugates, is involved in both of these processes. Coinfection with influenza A virus, which also expresses a neuraminidase, exacerbates nasal colonization and disease by S...
January 17, 2017: Infection and Immunity
https://www.readbyqxmd.com/read/28094330/inhibition-of-influenza-a-virus-infection-by-fucoidan-targeting-viral-neuraminidase-and-cellular-egfr-pathway
#3
Wei Wang, Jiandong Wu, Xiaoshuang Zhang, Cui Hao, Xiaoliang Zhao, Guangling Jiao, Xindi Shan, Wenjing Tai, Guangli Yu
Development of novel anti-influenza A virus (IAV) drugs with high efficiency and low toxicity is critical for preparedness against influenza outbreaks. Herein, we investigated the anti-IAV activities and mechanisms of fucoidan in vitro and in vivo. The results showed that a fucoidan KW derived from brown algae Kjellmaniella crassifolia effectively blocked IAV infection in vitro with low toxicity. KW possessed broad anti-IAV spectrum and low tendency of induction of viral resistance, superior to the anti-IAV drug amantadine...
January 17, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28094141/intravenous-zanamivir-or-oral-oseltamivir-for-hospitalised-patients-with-influenza-an-international-randomised-double-blind-double-dummy-phase-3-trial
#4
Francisco M Marty, Joan Vidal-Puigserver, Carol Clark, Sandeep K Gupta, Esperanza Merino, Denis Garot, Marianne J Chapman, Frédérique Jacobs, Eduardo Rodriguez-Noriega, Petr Husa, Denise Shortino, Helen A Watson, Phillip J Yates, Amanda F Peppercorn
BACKGROUND: Neuraminidase inhibitors are effective for the treatment of acute uncomplicated influenza. However, there is an unmet need for intravenous treatment for patients admitted to hospital with severe influenza. We studied whether intravenous zanamivir was a suitable treatment in this setting. METHODS: In this international, randomised, double-blind, double-dummy, phase 3 trial, we recruited patients aged 16 years or older with severe influenza admitted to 97 hospitals from 26 countries...
January 13, 2017: Lancet Respiratory Medicine
https://www.readbyqxmd.com/read/28079188/proteome-response-of-chicken-embryo-fibroblast-cells-to-recombinant-h5n1-avian-influenza-viruses-with-different-neuraminidase-stalk-lengths
#5
Yongtao Li, Fan Ming, Huimin Huang, Kelei Guo, Huanchun Chen, Meilin Jin, Hongbo Zhou
The variation on neuraminidase (NA) stalk region of highly pathogenic avian influenza H5N1 virus results in virulence change in animals. In our previous studies, the special NA stalk-motif of H5N1 viruses has been demonstrated to play a significant role in the high virulence and pathogenicity in chickens. However, the molecular mechanisms underlying the pathogenicity of viruses with different NA stalk remain poorly understood. This study presents a comprehensive characterization of the proteome response of chicken cells to recombinant H5N1 virus with stalk-short NA (rNA-wt) and the stalkless NA mutant virus (rSD20)...
January 12, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28067324/the-in-vivo-efficacy-of-neuraminidase-inhibitors-cannot-be-determined-from-the-decay-rates-of-influenza-viral-titers-observed-in-treated-patients
#6
John Palmer, Hana M Dobrovolny, Catherine A A Beauchemin
Antiviral therapy is a first line of defence against new influenza strains. Current pandemic preparations involve stock- piling oseltamivir, an oral neuraminidase inhibitor (NAI), so rapidly determining the effectiveness of NAIs against new viral strains is vital for deciding how to use the stockpile. Previous studies have shown that it is possible to extract the drug efficacy of antivirals from the viral decay rate of chronic infections. In the present work, we use a nonlinear mathematical model representing the course of an influenza infection to explore the possibility of extracting NAI drug efficacy using only the observed viral titer decay rates seen in patients...
January 9, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28062798/quantitative-proteome-analysis-of-mouse-liver-lysosomes-provides-evidence-for-mannose-6-phosphate-independent-targeting-mechanisms-of-acid-hydrolases-in-mucolipidosis-ii
#7
Sandra Markmann, Svenja Krambeck, Christopher J Hughes, Mina Mirzaian, Johannes M F G Aerts, Paul Saftig, Michaela Schweizer, Johannes C P Vissers, Thomas Braulke, Markus Damme
The efficient receptor-mediated targeting of soluble lysosomal proteins to lysosomes requires the modification with mannose 6-phosphate (M6P) residues. Although the absence of M6P results in missorting and hypersecretion of lysosomal enzymes in many cells, normal levels of lysosomal enzymes have been reported in liver of patients lacking the M6P-generating phosphotransferase (PT). The identity of lysosomal proteins depending on M6P has not yet been comprehensively analyzed. In this study we purified lysosomes from liver of PT-defective mice and 67 known soluble lysosomal proteins were quantified using an ion mobility-assisted data independent label-free LC-MS approach...
January 6, 2017: Molecular & Cellular Proteomics: MCP
https://www.readbyqxmd.com/read/28061848/multi-antigen-avian-influenza-a-h7n9-virus-like-particles-particulate-characterizations-and-immunogenicity-evaluation-in-murine-and-avian-models
#8
Che-Ming Jack Hu, Chu-Yang Chien, Ming-Tsan Liu, Zih-Syun Fang, Sui-Yuan Chang, Rong-Huay Juang, Shih-Chung Chang, Hui-Wen Chen
BACKGROUND: Human infection with avian influenza A virus (H7N9) was first reported in China in March 2013. Since then, hundreds of cases have been confirmed showing severe symptoms with a high mortality rate. The virus was transmitted from avian species to humans and has spread to many neighboring areas, raising serious concerns over its pandemic potential. Towards containing the disease, the goal of this study is to prepare a virus-like particle (VLP) that consists of hemagglutinin (HA), neuraminidase (NA) and matrix protein 1 (M1) derived from the human isolate A/Taiwan/S02076/2013(H7N9) for potential vaccine development...
January 7, 2017: BMC Biotechnology
https://www.readbyqxmd.com/read/28060516/glycosylation-characterization-of-an-influenza-h5n7-hemagglutinin-series-with-engineered-glycosylation-patterns-implications-for-structure-function-relationships
#9
Lisa M Parsons, Yanming An, Robert P de Vries, Cornelis A M de Haan, John F Cipollo
The glycosylation patterns of four recombinant H5 hemagglutinins (HAs) derived from A/Mallard/Denmark/64650/03 (H5N7) have been characterized. The proteins were expressed in (i) HEK293T cells to produce complex glycoforms, (ii) HEK293T cells treated with Vibrio cholera neuraminidase to provide asialo-complex glycoforms, (iii) HEK293S GnTI(-) cells with predominantly the canonical Man5GlcNAc2 glycoform, and (iv) Drosophila S2 insect cells producing primarily paucimannose glycoforms. Previously, these HAs were used to investigate the effect of different glycosylation states on the immune responses in chicken and mouse systems...
December 5, 2016: Journal of Proteome Research
https://www.readbyqxmd.com/read/28060291/optimization-of-a-quantitative-micro-neutralization-assay
#10
Yipu Lin, Yan Gu, John W McCauley
The micro-neutralization (MN) assay is a standard technique for measuring the infectivity of the influenza virus and the inhibition of virus replication. In this study, we present the protocol of an imaging-based MN assay to quantify the true antigenic relationships between viruses. Unlike typical plaque reduction assays that rely on visible plaques, this assay quantitates the entire infected cell population of each well. The protocol matches the virus type or subtype with the selection of cell lines to achieve maximum infectivity, which enhances sample contrast during imaging and image processing...
December 14, 2016: Journal of Visualized Experiments: JoVE
https://www.readbyqxmd.com/read/28057117/-molecular-analysis-of-hemagglutinin-and-neuraminidase-genes-of-avian-influenza-virus-h5n6-subtype-in-the-border-of-yunnan-province-from-2014-to-2015
#11
Q Kong, H Y Zhao, K Tian, B F Duan, Y Y Hu, T S Hu, Y G Zhang, W D Zhang, F Q Zhang
No abstract text is available yet for this article.
December 6, 2016: Zhonghua Yu Fang Yi Xue za Zhi [Chinese Journal of Preventive Medicine]
https://www.readbyqxmd.com/read/28043323/antiviral-medications-in-seasonal-and-pandemic-influenza
#12
Regine Lehnert, Mathias Pletz, Annicka Reuss, Tom Schaberg
BACKGROUND: Amantadine, oseltamivir, and zanamivir are currently available in Germany for the prevention and treatment of influenza. We review their efficacy and side-effect profiles. METHODS: This review is based on pertinent randomized and controlled trials (RCTs) and systematic reviews retrieved by a systematic literature search, and on other relevant literature. RESULTS: The efficacy of antiviral drugs for the prevention of symptomatic influenza ranges from 60% to 90% (number needed to treat [NNT], 8-89) depending on the population and type of drug in question...
November 25, 2016: Deutsches Ärzteblatt International
https://www.readbyqxmd.com/read/28036106/genetic-characterization-and-phylogenic-analysis-of-h5n1-avian-influenza-virus-detected-in-peafowl-in-kirkuk-province-iraq
#13
Peshnyar M A Rashid, Nahla M Saeed, Hiewa Othman Dyary
A highly pathogenic avian influenza, H5N1, was detected for the first time in peafowls in Kirkuk province, Iraq in 2015. Genetic analysis of the Kirkuk H5N1 indicated molecular markers for avian-type receptors. The Kirkuk H5N1 hemagglutinin gene had an infrequent amino acid cleavage site (SPQREKRRKRGLF), and neuraminidase genes showed sensitive molecular markers for antiviral drugs. Additionally, the phylogenetic analysis found that the Kirkuk H5N1 belonged to subclade 2.3.2.1c. Our results showed that the 2015 H5N1 from the Iraqi city of Kirkuk exhibited new genetic characterization and was different from the 2006 H5N1 isolate from Iraq...
December 30, 2016: Journal of Medical Virology
https://www.readbyqxmd.com/read/28028222/influenza-a-surface-glycosylation-and-vaccine-design
#14
Chung-Yi Wu, Chih-Wei Lin, Tsung-I Tsai, Chang-Chun David Lee, Hong-Yang Chuang, Jhih-Bin Chen, Ming-Hung Tsai, Bo-Rui Chen, Pei-Wen Lo, Chiu-Ping Liu, Vidya S Shivatare, Chi-Huey Wong
We have shown that glycosylation of influenza A virus (IAV) hemagglutinin (HA), especially at position N-27, is crucial for HA folding and virus survival. However, it is not known whether the glycosylation of HA and the other two major IAV surface glycoproteins, neuraminidase (NA) and M2 ion channel, is essential for the replication of IAV. Here, we show that glycosylation of HA at N-142 modulates virus infectivity and host immune response. Glycosylation of NA in the stalk region affects its structure, activity, and specificity, thereby modulating virus release and virulence, and glycosylation at the catalytic domain affects its thermostability; however, glycosylation of M2 had no effect on its function...
December 27, 2016: Proceedings of the National Academy of Sciences of the United States of America
https://www.readbyqxmd.com/read/28026814/-prediction-of-selective-inhibition-of-neuraminidase-from-various-influenza-virus-strains-by-potential-inhibitors
#15
A V Mikurova, A V Rybina, V S Skvortsov
A universal model of inhibition of neuraminidases from various influenza virus strains by a particular has been developed. It is based on known 3D data for neuraminidases from three influenza virus strains (A/Tokyo/3/67, A/tern/Australia/G70C/75, B/Lee/40) and modeling of 3D structure of neuraminidases from other strains (A/PR/8/34 è A/Aichi/2/68). Using docking and molecular dynamics, we have modeled 235 enzyme-ligand complexes for 89 compounds with known IC50 values. Selection of final variants among three results obtained for each enzyme-ligand pair and calculation of independent variables for generation of linear regression equations was performed using MM-PBSA/MM-GBSA...
November 2016: Biomedit︠s︡inskai︠a︡ Khimii︠a︡
https://www.readbyqxmd.com/read/28025252/various-sulfated-carbohydrate-tumor-marker-candidates-identified-by-focused-glycomic-analyses
#16
Miki Tanaka-Okamoto, Mikio Mukai, Hidenori Takahashi, Yoshiyuki Fujiwara, Masayuki Ohue, Yasuhide Miyamoto
Glycomic analysis focused on sulfated O-glycans was performed to identify novel serum carbohydrate tumor markers. Sulfated glycans were enriched by α-neuraminidase digestion of pyridylaminated glycans prepared from sera, followed by anion exchange chromatography. Sulfated O-glycan profiles were constructed by two types of high performance liquid chromatography separation. Comparison of the profiles from 20 healthy controls with those of 11 gastric and 9 pancreatic cancer patients identified 14 marker candidates...
December 26, 2016: Glycobiology
https://www.readbyqxmd.com/read/28018341/differential-ccr7-targeting-in-dendritic-cells-by-three-naturally-occurring-cc-chemokines
#17
Gertrud M Hjortø, Olav Larsen, Anne Steen, Viktorija Daugvilaite, Christian Berg, Suzan Fares, Morten Hansen, Simi Ali, Mette M Rosenkilde
The CCR7 ligands CCL19 and CCL21 are increasingly recognized as functionally different (biased). Using mature human dendritic cells (DCs), we show that CCL19 is more potent than CCL21 in inducing 3D chemotaxis. Intriguingly, CCL21 induces prolonged and more efficient ERK1/2 activation compared with CCL19 and a C-terminal truncated (tailless) CCL21 in DCs. In contrast, tailless-CCL21 displays increased potency in DC chemotaxis compared with native CCL21. Using a CCL21-specific antibody, we show that CCL21, but not tailless-CCL21, accumulates at the cell surface...
2016: Frontiers in Immunology
https://www.readbyqxmd.com/read/28013578/molecular-docking-synthesis-and-biological-evaluation-of-naphthoquinone-as-potential-novel-scaffold-for-h5n1-neuraminidase-inhibition
#18
Garima Sharma, S Vasanth Kumar, Habibah A Wahab
A series of dimeric naphthoquinones containing natural 2-hydroxy-1-4-naphthoquinone moiety was designed, synthesized and evaluated against neuraminidase of H5N1 virus. p-Hydroxy derivatives showed higher inhibition when compared to p-halogenated compounds. Molecular docking studies conducted with H5N1 neuraminidase clearly demonstrated different binding modes of the most active compound onto the open and closed conformations of loop 150. The results thus provide not only evidences of a novel scaffold evaluated as inhibitor, but also a rational explanation involving molecular modeling and the role of loop 150 in the binding...
December 25, 2016: Journal of Biomolecular Structure & Dynamics
https://www.readbyqxmd.com/read/28013259/use-of-neuraminidase-inhibitors-for-treatment-of-severe-influenza-times-are-changing
#19
EDITORIAL
Emily T Martin
No abstract text is available yet for this article.
February 1, 2017: Clinical Infectious Diseases: An Official Publication of the Infectious Diseases Society of America
https://www.readbyqxmd.com/read/28012921/therapeutic-efficacy-of-peramivir-against-h5n1-highly-pathogenic-avian-influenza-viruses-harboring-the-neuraminidase-h275y-mutation
#20
Masanori Kobayashi, Makoto Kodama, Takeshi Noshi, Ryu Yoshida, Takushi Kanazu, Naoki Nomura, Kosuke Soda, Norikazu Isoda, Masatoshi Okamatsu, Yoshihiro Sakoda, Yoshinori Yamano, Akihiko Sato, Hiroshi Kida
High morbidity and mortality associated with human cases of highly pathogenic avian influenza (HPAI) viruses, including H5N1 influenza virus, have been reported. The purpose of the present study was to evaluate the antiviral effects of peramivir against HPAI viruses. In neuraminidase (NA) inhibition and virus replication inhibition assays, peramivir showed strong inhibitory activity against H5N1, H7N1 and H7N7 HPAI viruses with sub-nanomolar activity in enzyme assays. In H5N1 viruses containing the NA H275Y mutation, the antiviral activity of peramivir against the variant was lower than that against the wild-type...
December 22, 2016: Antiviral Research
keyword
keyword
36757
1
2
Fetch more papers »
Fetching more papers... Fetching...
Read by QxMD. Sign in or create an account to discover new knowledge that matter to you.
Remove bar
Read by QxMD icon Read
×

Search Tips

Use Boolean operators: AND/OR

diabetic AND foot
diabetes OR diabetic

Exclude a word using the 'minus' sign

Virchow -triad

Use Parentheses

water AND (cup OR glass)

Add an asterisk (*) at end of a word to include word stems

Neuro* will search for Neurology, Neuroscientist, Neurological, and so on

Use quotes to search for an exact phrase

"primary prevention of cancer"
(heart or cardiac or cardio*) AND arrest -"American Heart Association"