keyword
MENU ▼
Read by QxMD icon Read
search

neuraminidase

keyword
https://www.readbyqxmd.com/read/27902339/progressive-glycosylation-of-the-hemagglutinin-of-avian-influenza-h5n1-modulates-virus-replication-virulence-and-chicken-to-chicken-transmission-without-significant-impact-on-antigenic-drift
#1
El-Sayed M Abdelwhab, Jutta Veits, Kerstin Tauscher, Mario Ziller, Christian Grund, Mohamed K Hassan, Momtaz Shaheen, Timm C Harder, Jens P Teifke, Jürgen Stech, Thomas C Mettenleiter
Highly pathogenic H5N1 avian influenza virus (A/H5N1) devastated the poultry industry and continues to pose a pandemic threat. Studying the progressive genetic changes in A/H5N1 after long term circulation in poultry may help to better understand A/H5N1 biology in birds. A/H5N1 clade 2.2.1.1 antigenic drift viruses have been isolated from vaccinated commercial poultry in Egypt. They exhibit a peculiar stepwise accumulation of glycosylation sites (GS) in the hemagglutinin (HA) with viruses carrying, beyond the conserved 5 GS, additional GS at amino acid residues 72, 154, 236 and 273 resulting in 6, 7, 8 or 9 GS in the HA...
October 28, 2016: Journal of General Virology
https://www.readbyqxmd.com/read/27900002/therapeutic-targeting-of-liver-cancer-with-a-recombinant-dna-vaccine-containing-the-hemagglutinin-neuraminidase-gene-of-newcastle-disease-virus-via-apoptotic-dependent-pathways
#2
Li-Gang Chen, Yuan-Sheng Liu, Tang-Hui Zheng, Xu Chen, Ping Li, Chuan-Xing Xiao, Jian-Lin Ren
A total of ~38.6 million mortalities occur due to liver cancer annually, worldwide. Although a variety of therapeutic methods are available, the efficacy of treatment at present is extremely limited due to an increased risk of malignancy and inherently poor prognosis of liver cancer. Gene therapy is considered a promising option, and has shown notable potential for the comprehensive therapy of liver cancer, in keeping with advances that have been made in the development of cancer molecular biology. The present study aimed to investigate the synergistic effects of the abilities of the hemagglutinin neuraminidase protein of Newcastle disease virus (NDV), the pro-apoptotic factor apoptin from chicken anaemia virus, and the interferon-γ inducer interleukin-18 (IL-18) in antagonizing liver cancer...
November 2016: Oncology Letters
https://www.readbyqxmd.com/read/27899915/novel-h7n2-and-h5n6-avian-influenza-a-viruses-in-sentinel-chickens-a-sentinel-chicken-surveillance-study
#3
Teng Zhao, Yan-Hua Qian, Shan-Hui Chen, Guo-Lin Wang, Meng-Na Wu, Yong Huang, Guang-Yuan Ma, Li-Qun Fang, Gregory C Gray, Bing Lu, Yi-Gang Tong, Mai-Juan Ma, Wu-Chun Cao
In 2014, a sentinel chicken surveillance for avian influenza viruses was conducted in aquatic bird habitat near Wuxi City, Jiangsu Province, China. Two H7N2, one H5N6, and two H9N2 viruses were isolated. Sequence analysis revealed that the H7N2 virus is a novel reassortant of H7N9 and H9N2 viruses and H5N6 virus is a reassortant of H5N1 clade 2.3.4 and H6N6 viruses. Substitutions V186 and L226 (H3 numbering) in the hemagglutinin (HA) gene protein was found in two H7N2 viruses but not in the H5N6 virus. Two A138 and A160 mutations were identified in the HA gene protein of all three viruses but a P128 mutation was only observed in the H5N6 virus...
2016: Frontiers in Microbiology
https://www.readbyqxmd.com/read/27899226/virospot-microneutralization-assay-for-antigenic-characterization-of-human-influenza-viruses
#4
Carel A van Baalen, Rienk E Jeeninga, Germaine H W M Penders, Brenda van Gent, Ruud van Beek, Marion P G Koopmans, Guus F Rimmelzwaan
The hemagglutination inhibition (HI) assay has been used for the antigenic characterization of influenza viruses for decades. However, the majority of recent seasonal influenza A viruses of the H3N2 subtype has lost the capacity to agglutinate erythrocytes of various species. The hemagglutination (HA) activity of other A(H3N2) strains is generally sensitive to the action of the neuraminidase inhibitor oseltamivir, which indicates that the neuraminidase and not the hemagglutinin is responsible for the HA activity...
November 26, 2016: Vaccine
https://www.readbyqxmd.com/read/27898629/influenza-like-illness-diagnosis-and-management-in-the-acute-care-setting
#5
Sharon G Humiston, Thuylinh N Pham
During influenza season, acute respiratory illness due to influenza is difficult to distinguish from other influenza-like illnesses, but testing should be reserved for situations when timely results will influence management or infection control measures. Immunization status and timing of disease onset notwithstanding, a neuraminidase inhibitor should be offered immediately for certain high-risk children; neuraminidase inhibitor treatment should be considered if shorter illness is warranted or an at-risk sibling may be protected...
December 2016: Pediatric Emergency Care
https://www.readbyqxmd.com/read/27884765/efficacy-of-clarithromycin-naproxen-oseltamivir-combination-in-the-treatment-of-patients-hospitalized-for-influenza-a-h3n2-infection-an-open-label-randomized-controlled-phase-2b-3-trial
#6
Ivan Fn Hung, Kelvin Kw To, Jasper Fw Chan, Vincent Cc Cheng, Kevin Sh Liu, Anthony Tam, Tuen-Ching Chan, Anna Jinxia Zhang, Patrick Li, Tin-Lun Wong, Ricky Zhang, Michael Ks Cheung, William Leung, Johnson Yn Lau, Manson Fok, Honglin Chen, Kwok-Hung Chan, Kwok-Yung Yuen
BACKGROUND: Influenza causes excessive hospitalizations and deaths. Single agent treatment with oseltamivir in severe influenza might be insufficient. The study assessed the efficacy and safety of oseltamivir-clarithromycin-naproxen combination for treatment of serious influenza. METHODS: From February to April 2015, we conducted a prospective open-label randomized-controlled trial. Adult patients hospitalized for A(H3N2) influenza were randomly assigned to a 2-day combination of clarithromycin 500mg, naproxen 200mg and oseltamivir 75mg twice daily, followed by 3 days of oseltamivir; or oseltamivir 75mg twice daily without placebos for 5 days as control (1:1)...
November 21, 2016: Chest
https://www.readbyqxmd.com/read/27881069/anti-influenza-virus-effects-of-catechins-a-molecular-and-clinical-review
#7
Kazuke Ide, Yohei Kawasaki, Koji Kawakami, Hiroshi Yamada
Influenza infection and associated epidemics represent a serious public health problem. Several preventive and curative measures exist against its spread including vaccination and therapeutic agents such as neuraminidase inhibitors (e.g., oseltamivir, zanamivir, as well as peramivir and laninamivir, which are licensed in several countries) and adamantanes (e.g., amantadine and rimantadine). However, neuraminidase inhibitor- and adamantane-resistant viruses have been detected, whereas vaccines exhibit strain-specific effects and are limited in supply...
November 22, 2016: Current Medicinal Chemistry
https://www.readbyqxmd.com/read/27876611/re-emergence-of-amantadine-resistant-variants-among-highly-pathogenic-avian-influenza-h5n1-viruses-in-egypt
#8
Rabeh El-Shesheny, Ola Bagato, Ahmed Kandeil, Ahmed Mostafa, Sara H Mahmoud, Hamdi M Hassanneen, Richard J Webby, Mohamed A Ali, Ghazi Kayali
Highly pathogenic avian influenza (HPAI) H5N1 virus continues to undergo substantial evolution. Emergence of antiviral resistance among H5N1 avian influenza viruses is a major challenge in the control of pandemic influenza. Numerous studies have focused on the genetic and evolutionary dynamics of the hemagglutinin and neuraminidase genes; however, studies on the susceptibility of HPAI H5N1 viruses to amantadine and genetic diversity of the matrix (M) gene are limited. Accordingly, we studied the amantadine susceptibility of the HPAI H5N1 viruses isolated in Egypt during 2006-2015 based on genotypic and phenotypic characteristics...
October 29, 2016: Infection, Genetics and Evolution
https://www.readbyqxmd.com/read/27874291/zwitterionic-structures-from-physicochemical-properties-toward-computer-aided-drug-designs
#9
Zhiwei Yang, Qinyi Li, Gang Yang
Zwitterions, used widely in chemical, biological and medicinal fields, show distinct physicochemical properties relative to ordinary ampholytes, which largely decide their bioavailability and biological activities. In the present manuscript, these properties are discussed in order to facilitate our understanding of zwitterionic structures, followed by various examples of zwitterionic drugs and the critical role these properties play. We specifically focus our discussions on neuraminidase inhibitors (NAIs), which are used in the treatment and prevention of influenza, covering their computer-assisted design, transformation to zwitterionic isomers and interaction mechanisms of NAIs with proteins...
December 2016: Future Medicinal Chemistry
https://www.readbyqxmd.com/read/27852956/preparation-for-a-first-in-man-lentivirus-trial-in-patients-with-cystic-fibrosis
#10
Eric W F W Alton, Jeffery M Beekman, A Christopher Boyd, June Brand, Marianne S Carlon, Mary M Connolly, Mario Chan, Sinead Conlon, Heather E Davidson, Jane C Davies, Lee A Davies, Johanna F Dekkers, Ann Doherty, Sabrina Gea-Sorli, Deborah R Gill, Uta Griesenbach, Mamoru Hasegawa, Tracy E Higgins, Takashi Hironaka, Laura Hyndman, Gerry McLachlan, Makoto Inoue, Stephen C Hyde, J Alastair Innes, Toby M Maher, Caroline Moran, Cuixiang Meng, Michael C Paul-Smith, Ian A Pringle, Kamila M Pytel, Andrea Rodriguez-Martinez, Alexander C Schmidt, Barbara J Stevenson, Stephanie G Sumner-Jones, Richard Toshner, Shu Tsugumine, Marguerite W Wasowicz, Jie Zhu
We have recently shown that non-viral gene therapy can stabilise the decline of lung function in patients with cystic fibrosis (CF). However, the effect was modest, and more potent gene transfer agents are still required. Fuson protein (F)/Hemagglutinin/Neuraminidase protein (HN)-pseudotyped lentiviral vectors are more efficient for lung gene transfer than non-viral vectors in preclinical models. In preparation for a first-in-man CF trial using the lentiviral vector, we have undertaken key translational preclinical studies...
November 16, 2016: Thorax
https://www.readbyqxmd.com/read/27849220/surveillance-of-antiviral-resistance-markers-in-argentina-detection-of-e119v-neuraminidase-mutation-in-a-post-treatment-immunocompromised-patient
#11
Andrea Pontoriero, Martín Avaro, Estefania Benedetti, Mara Russo, Andrea Czech, Natalia Periolo, Ana Campos, Ana Zamora, Elsa Baumeister
Although vaccines are the best means of protection against influenza, neuraminidase inhibitors are currently the main antiviral treatment available to control severe influenza cases. One of the most frequent substitutions in the neuraminidase (NA) protein of influenza A(H3N2) viruses during or soon after oseltamivir administration is E119V mutation. We describe the emergence of a mixed viral population with the E119E/V mutation in the NA protein sequence in a post-treatment influenza sample collected from an immunocompromised patient in Argentina...
November 16, 2016: Memórias do Instituto Oswaldo Cruz
https://www.readbyqxmd.com/read/27848039/antiviral-susceptibility-profile-of-influenza-a-viruses-keep-an-eye-on-immunocompromised-patients-under-prolonged-treatment
#12
A Kossyvakis, A-F A Mentis, K Tryfinopoulou, V Pogka, A Kalliaropoulos, E Antalis, T Lytras, A Meijer, S Tsiodras, P Karakitsos, A F Mentis
There was an increase in severe and fatal influenza cases in Greece during the 2011-2015 post-pandemic period. To investigate causality, we determined neuraminidase (NA) inhibitor susceptibility and resistance-conferring NA and hemagglutinin (HA) mutations in circulating influenza type A viruses during the pandemic (2009-2010) and post-pandemic periods in Greece. One hundred thirty-four influenza A(H1N1)pdm09 and 95 influenza A(H3N2) viruses submitted to the National Influenza Reference Laboratory of Southern Greece were tested for susceptibility to oseltamivir and zanamivir...
November 15, 2016: European Journal of Clinical Microbiology & Infectious Diseases
https://www.readbyqxmd.com/read/27847354/an-amino-acid-in-the-stalk-domain-of-n1-neuraminidase-is-critical-for-enzymatic-activity
#13
Mark Zanin, Susu Duan, Sook-San Wong, Gyanendra Kumar, Pradyumna Baviskar, Emily Collin, Charles Russell, Subrata Barman, Benjamin Hause, Richard Webby
: Neuraminidase (NA) is a sialidase expressed on the surface of influenza A viruses that releases progeny viruses from the surface of infected cells and prevents viruses becoming trapped in mucus. It is a homo-tetramer with each monomer consisting of a transmembrane region, a stalk and a globular head with sialidase activity. We recently characterized two swine viruses of the pandemic H1N1 lineage; A/swine/Virginia/1814-1/2012 (pH1N1low-1) and A/swine/Virginia/1814-2/2012 (pH1N1low-2) with almost undetectable NA enzymatic activity compared to the highly homologous A/swine/Pennsylvania/2436/2012 (pH1N1-1) and A/swine/Minnesota/2499/2012 (pH1N1-2) viruses...
November 9, 2016: Journal of Virology
https://www.readbyqxmd.com/read/27847205/sialylated-%C3%AE-1-6-branched-n-glycans-modulate-the-adhesion-invasion-and-metastasis-of-hepatocarcinoma-cells
#14
Xiao Yu, Yujie Zhao, Liping Wang, Xixi Chen, Zhen Su, Han Zhang, Qingmin Yuan, Shujing Wang
The mouse hepatocarcinoma cell lines Hca-F and Hca-P have been derived from hepatocarcinoma in mice and metastasize only to the lymph node. Hca-F cells displayed greater lymphatic metastasis ability than Hca-P cells. When the two cell lines were compared for cell surface sialylated β1,6 branched N-glycans by flow cytometry using L-PHA and SNA, Hca-F cells were found to express significantly higher levels. To explore the effect of increased sialylated β1,6 branched N-glycans on hepatocarcinoma progression, we inhibit their expression in Hca-F cells by using swainsonine treatment and RNA interference...
November 12, 2016: Biomedicine & Pharmacotherapy, Biomédecine & Pharmacothérapie
https://www.readbyqxmd.com/read/27845731/influenza-neuraminidase-inhibitors-synthetic-approaches-derivatives-and-biological-activity
#15
REVIEW
Pedro Laborda, Su-Yan Wang, Josef Voglmeir
Despite being a common viral disease, influenza has very negative consequences, causing the death of around half a million people each year. A neuraminidase located on the surface of the virus plays an important role in viral reproduction by contributing to the release of viruses from infected host cells. The treatment of influenza is mainly based on the administration of neuraminidase inhibitors. The neuraminidase inhibitors zanamivir, laninamivir, oseltamivir and peramivir have been commercialized and have been demonstrated to be potent influenza viral neuraminidase inhibitors against most influenza strains...
November 11, 2016: Molecules: a Journal of Synthetic Chemistry and Natural Product Chemistry
https://www.readbyqxmd.com/read/27845268/evidence-for-influenza-b-virus-lineage-shifts-and-reassortants-circulating-in-thailand-in-2014-2016
#16
Nipaporn Tewawong, Nungruthai Suntronwong, Sumeth Korkong, Apiradee Theamboonlers, Sompong Vongpunsawad, Yong Poovorawan
Towards the surveillance of seasonal influenza viruses between August 2015 and June 2016, respiratory samples (n=3390) were collected from Thai patients with influenza-like illness. One-hundred fifty-seven (4.6%) samples tested positive for influenza B virus by real-time reverse-transcription polymerase chain reaction (RT-PCR). While the influenza B virus Yamagata lineage strains were more prevalent than the Victoria lineage strains in 2015 (77.5% vs. 22.5%), the Victoria lineage strains appeared to dominate the first half of 2016 (62...
November 12, 2016: Infection, Genetics and Evolution
https://www.readbyqxmd.com/read/27833149/contribution-of-hn-protein-length-diversity-to-newcastle-disease-virus-virulence-replication-and-biological-activities
#17
Jihui Jin, Jing Zhao, Yingchao Ren, Qi Zhong, Guozhong Zhang
To evaluate the contribution of length diversity in the hemagglutinin-neuraminidase (HN) protein to the pathogenicity, replication and biological characteristics of Newcastle disease virus (NDV), we used reverse genetics to generate a series of recombinant NDVs containing truncated or extended HN proteins based on an infectious clone of genotype VII NDV (SG10 strain). The mean death times and intracerebral pathogenicity indices of these viruses showed that the different length mutations in the HN protein did not alter the virulence of NDV...
November 11, 2016: Scientific Reports
https://www.readbyqxmd.com/read/27826550/lysosomal-cathepsin-a-plays-a-significant-role-in-the-processing-of-endogenous-bioactive-peptides
#18
Zehra Kevser Timur, Secil Akyildiz Demir, Volkan Seyrantepe
Lysosomal serine carboxypeptidase Cathepsin A (CTSA) is a multifunctional enzyme with distinct protective and catalytic function. CTSA present in the lysosomal multienzyme complex to facilitate the correct lysosomal routing, stability and activation of with beta-galactosidase and alpha-neuraminidase. Beside CTSA has role in inactivation of bioactive peptides including bradykinin, substances P, oxytocin, angiotensin I and endothelin-I by cleavage of 1 or 2 amino acid(s) from C-terminal ends. In this study, we aimed to elucidate the regulatory role of CTSA on bioactive peptides in knock-in mice model of CTSA(S190A) ...
2016: Frontiers in Molecular Biosciences
https://www.readbyqxmd.com/read/27826541/inhibition-of-h9n2-virus-invasion-into-dendritic-cells-by-the-s-layer-protein-from-l-acidophilus-atcc-4356
#19
Xue Gao, Lulu Huang, Liqi Zhu, Chunxiao Mou, Qihang Hou, Qinghua Yu
Probiotics are essential for the prevention of virus invasion and the maintenance of the immune balance. However, the mechanism of competition between probiotics and virus are unknown. The objectives of this study were to isolate the surface layer (S-layer) protein from L. acidophilus ATCC 4356 as a new antiviral material, to evaluate the stimulatory effects of the S-layer protein on mouse dendritic cells (DCs) and to verify its ability to inhibit the invasion of H9N2 avian influenza virus (AIV) in DCs. We found that the S-layer protein induced DCs activation and up-regulated the IL-10 secretion...
2016: Frontiers in Cellular and Infection Microbiology
https://www.readbyqxmd.com/read/27825520/versatility-of-a-localized-surface-plasmon-resonance-based-gold-nanoparticle-alloyed-quantum-dot-nanobiosensor-for-immunofluorescence-detection-of-viruses
#20
Kenshin Takemura, Oluwasesan Adegoke, Naoto Takahashi, Tatsuya Kato, Tian-Cheng Li, Noritoshi Kitamoto, Tomoyuki Tanaka, Tetsuro Suzuki, Enoch Y Park
Flu infection, caused by the influenza virus, constitutes a serious threat to human lives worldwide. A rapid, sensitive and specific diagnosis is urgently needed for point-of-care treatment and to control the rapid spread of this disease. In this study, an ultrasensitive, rapid and specific localized surface plasmon resonance (LSPR)-induced immunofluorescence nanobiosensor has been developed for the influenza virus based on a gold nanoparticle (AuNP)-induced quantum dot (QD) fluorescence signal. Alloyed quaternary CdSeTeS QDs were synthesized via the hot-injection organometallic route and were subsequently capped with l-cysteine via a ligand exchange reaction...
October 20, 2016: Biosensors & Bioelectronics
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"