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https://www.readbyqxmd.com/read/29348625/universal-type-subtype-specific-antibodies-for-quantitative-analyses-of-neuraminidase-in-trivalent-influenza-vaccines
#1
Kangwei Xu, Changgui Li, Caroline Gravel, Zheng Jiang, Bozena Jaentschke, Gary Van Domselaar, Xuguang Li, Junzhi Wang
Both influenza viral hemagglutinin and neuraminidase can induce protective immune responses in humans. Although the viral hemagglutinin antigens have been quantified in influenza vaccines, the amounts of neuraminidase remain undetermined. Using comprehensive bioinformatics analyses of all neuraminidase sequences, we identified highly conserved and subtype-specific peptide epitopes within each of N1, N2 and type B neuraminidase groups. Mono-specific antibodies generated against these peptides bound to their respective subtype/type only while demonstrating remarkable specificity against the viral neuraminidase sequences without any cross-reactivity with allantoic and cellular proteins...
January 18, 2018: Scientific Reports
https://www.readbyqxmd.com/read/29344581/glycophorin-c-sialylation-regulates-lu-bcam-adhesive-capacity-during-erythrocyte-aging
#2
T R L Klei, D Z de Back, P J Asif, P J J H Verkuijlen, M Veldthuis, P C Ligthart, J Berghuis, E Clifford, B M Beuger, T K van den Berg, R van Zwieten, W El Nemer, R van Bruggen
Lutheran/basal cell adhesion molecule (Lu/BCAM) is a transmembrane adhesion molecule expressed by erythrocytes and endothelial cells that can interact with the extracellular matrix protein laminin-α5. In sickle cell disease, Lu/BCAM is thought to contribute to adhesion of sickle erythrocytes to the vascular wall, especially during vaso-occlusive crises. On healthy erythrocytes however, its function is unclear. Here we report that Lu/BCAM is activated during erythrocyte aging. We show that Lu/BCAM-mediated binding to laminin-α5 is restricted by interacting, in cis, with glycophorin-C-derived sialic acid residues...
January 9, 2018: Blood Advances
https://www.readbyqxmd.com/read/29341588/human-neuraminidase-isoenzymes-show-variable-activities-for-9-o-acetyl-sialoside-substrates
#3
Carmanah D Hunter, Neha Khanna, Michele R Richards, Reza Rezaei Darestani, Chunxia Zou, John S Klassen, Christopher W Cairo
Recognition of terminal sialic acids is central to many cellular processes, and structural modification of sialic acid can disrupt these interactions. A prominent, naturally occuring, modification of sialic acid is 9-O-acetylation (9-O-Ac). Study of this modification through generation and analysis of 9-O-Ac sialosides is challenging due to the lability of the acetate group. Fundamental questions regarding the role of 9-O-Ac sialic acids remain unanswered, including what effect it may have on recognition and hydrolysis by the human neuraminidase enzymes (hNEU)...
January 17, 2018: ACS Chemical Biology
https://www.readbyqxmd.com/read/29333829/-galactosialidosis-a-new-de-novo-mutation-in-ctsa-gene-in-a-patient-with-late-infantile-galactosialidosis
#4
Lara García Hernández, Javier Sierra Sirvent, Laura Gort Mas, María J Coll Roseli
Galactosialidosis (OMIM #256540) is an autosomal recessive lysosomal storage disorder caused by mutations in the CTSA gene, which encodes the protective protein cathepsin A. The loss of function of this protein causes a secondarily deficiency of beta-galactosidase and N-acetyl-a-neuraminidase enzymes activities. We describe the clinical, biochemical and molecular analysis of a case report with a phenotype compatible with the late infantile form. The biochemical analysis reveled deficiencies of beta-galactosidase and neuraminidase activities in dried blood spot and fibroblasts and the molecular study showed two missense mutations in the CTSA gene: a previously reported mutation, p...
February 1, 2018: Archivos Argentinos de Pediatría
https://www.readbyqxmd.com/read/29331671/the-molecular-characteristics-of-avian-influenza-viruses-h9n2-derived-from-air-samples-in-live-poultry-markets
#5
Yanheng Wu, Jinsi Lin, Shuhuan Yang, Ying Xie, Man Wang, Xueqin Chen, Yayang Zhu, Le Luo, Wuyang Shi
OBJECTIVE: To study the molecular characteristics of H9N2-subtype avian influenza viruses (AIVs) isolated from air samples collected in live poultry markets (LPMs) and explore their sequence identities with AIVs that caused human infection. METHODS: Weekly surveillance of H9N2-subtype AIVs in the air of LPMs was conducted from 2015 to 2016. H9-positive samples were isolated from chicken embryos. Whole genome sequences of the isolated AIVs were obtained through high-throughput sequencing...
January 10, 2018: Infection, Genetics and Evolution
https://www.readbyqxmd.com/read/29328525/a-role-of-sialic-acid-containing-glycans-of-matrix-metalloproteinase-9-mmp-9-in-the-interaction-between-mmp-9-and-staphylococcal-superantigen-like-protein-5-ssl5
#6
Chisato Kurisaka, Teruaki Oku, Saotomo Itoh, Tsutomu Tsuji
The staphylococcal superantigen-like proteins (SSLs) exhibit no superantigenic activity but have recently been considered to act as immune suppressors. It was previously reported that SSL5 bound to P-selectin glycoprotein ligand-1 (PSGL-1) and matrix metalloproteinase (MMP)-9, leading to inhibition of leukocyte adhesion and invasion. These interactions were suggested to depend on sialic acid-containing glycans of MMP-9, but the roles of sialic acids in the interaction between SSL5 and MMP-9 are still controversial...
January 12, 2018: Microbiology and Immunology
https://www.readbyqxmd.com/read/29324781/neuraminidase-inhibitor-susceptibility-and-neuraminidase-enzyme-kinetics-of-human-influenza-a-and-b-viruses-circulating-in-thailand-in-2010-2015
#7
Nipaporn Tewawong, Bindumadhav M Marathe, Yong Poovorawan, Sompong Vongpunsawad, Richard J Webby, Elena A Govorkova
Amino acid substitutions within or near the active site of the viral neuraminidase (NA) may affect influenza virus fitness. In influenza A(H3N2) and B viruses circulating in Thailand between 2010 and 2015, we identified several NA substitutions that were previously reported to be associated with reduced inhibition by NA inhibitors (NAIs). To study the effect of these substitutions on the enzymatic properties of NA and on virus characteristics, we generated recombinant influenza viruses possessing either a wild type (WT) NA or an NA with a single I222V, S331G, or S331R substitution [in influenza A(H3N2) viruses] or a single D342S, A395T, A395V, or A395D NA substitution (in influenza B viruses)...
2018: PloS One
https://www.readbyqxmd.com/read/29324680/phylogenetic-analysis-and-characterization-of-a-sporadic-isolate-of-equine-influenza-a-h3n8-from-an-unvaccinated-horse-in-2015
#8
Chithra C Sreenivasan, Sunayana S Jandhyala, Sisi Luo, Ben M Hause, Milton Thomas, David E B Knudsen, Pamela Leslie-Steen, Travis Clement, Stephanie E Reedy, Thomas M Chambers, Jane Christopher-Hennings, Eric Nelson, Dan Wang, Radhey S Kaushik, Feng Li
Equine influenza, caused by the H3N8 subtype, is a highly contagious respiratory disease affecting equid populations worldwide and has led to serious epidemics and transboundary pandemics. This study describes the phylogenetic characterization and replication kinetics of recently-isolated H3N8 virus from a nasal swab obtained from a sporadic case of natural infection in an unvaccinated horse from Montana, USA. The nasal swab tested positive for equine influenza by Real-Time Quantitative Reverse Transcription Polymerase Chain Reaction (RT-PCR)...
January 11, 2018: Viruses
https://www.readbyqxmd.com/read/29324342/peramivir-conjugates-as-orally-available-agents-against-influenza-h275y-mutant
#9
Peng-Cheng Wang, Din-Chi Chiu, Jia-Tsrong Jan, Wen-I Huang, Yin-Chen Tseng, Ting-Ting Li, Ting-Jen Cheng, Keng-Chang Tsai, Jim-Min Fang
Peramivir is an efficacious neuraminidase (NA) inhibitor for treatment of influenza by intravenous administration. However, the efficacy of peramivir toward the H275Y mutant is appreciably reduced. To address this drawback, conjugation of peramivir with caffeic acid is devised in this study to enhance the binding affinity with neuraminidases. The C2-OH group of peramivir is elaborated to link with caffeate derivatives, giving the desired conjugates 8 and 9 that possess potent NA inhibitory activity against both wild-type and H275Y viruses with the IC50 values in nanomolar range...
December 24, 2017: European Journal of Medicinal Chemistry
https://www.readbyqxmd.com/read/29321309/specific-mutations-in-the-pb2-protein-of-influenza-a-virus-compensate-for-the-lack-of-efficient-ifn-antagonism-of-the-ns1-protein-of-bat-influenza-a-like-viruses
#10
Teresa Aydillo, Juan Ayllon, Amzie Pavlisin, Carles Martinez-Romero, Shashank Tripathi, Ignacio Mena, Andrés Moreira-Soto, Amanda Vicente-Santos, Eugenia Corrales-Aguilar, Martin Schwemmle, Adolfo García-Sastre
Recently, two new influenza A-like viruses have been discovered in bats, HL17NL10 and HL18NL11. The hemagglutinin-like (HL) and neuraminidase like (NL) proteins of these viruses lack hemagglutination and neuraminidase activities despite their sequence and structural homologies with the HA and NA proteins of conventional influenza A virus. We now have investigated whether the NS1 proteins of HL17NL10 and HL18NL11 viruses can functionally substitute the NS1 protein of a conventional influenza A virus. For this purpose we generated recombinant influenza A/PR8/34 (PR8) H1N1 viruses containing the NS1 protein of PR8 WT, HL17NL10 and HL18NL11 viruses...
January 10, 2018: Journal of Virology
https://www.readbyqxmd.com/read/29315673/surveillance-for-antiviral-resistance-among-influenza-viruses-circulating-in-algeria-during-five-consecutive-influenza-seasons-2009-to-2014
#11
Assia Ait Aissa, Fawzi Derrar, Djouher Hanoun, El Alia Gradi, Dino Scaravelli, Zihad Bouslama
BACKGROUND: Influenza season 2007/2008 was marked by a worldwide emergence of oseltamivir-resistant A(H1N1) viruses possessing a mutation in the neuraminidase gene causing His-to-Tyr substitution at amino acid position 275 (H275Y). These strains were isolated in Algeria where 30% of seasonal A(H1N1) viruses harbored the H275Y mutation. Emergence of resistant viruses to currently approved antiviral drug determined the need for antiviral susceptibility monitoring in Algeria especially that oseltamivir is currently used in hospitals of some provinces of the country for treatment of influenza in populations at risk...
January 9, 2018: Journal of Medical Virology
https://www.readbyqxmd.com/read/29300686/220-mutation-in-the-hemagglutinin-of-avian-influenza-a-h7n9-virus-alters-antigenicity-during-vaccine-strain-development
#12
Liqi Liu, Jian Lu, Zi Li, Jianfang Zhou, Junfeng Guo, Xiyan Li, Jia Liu, Yuelong Shu, Dayan Wang
Since the first confirmed case of H7N9 infection was reported in China, there have been five epidemic waves of human H7N9 infections between 2013 and 2017. The fifth wave differed from the previous four waves in that highly pathogenic avian influenza (HPAI) H7N9 viruses with multiple basic amino acids at the cleavage site were detected in humans, poultry and environmental samples. The HPAI H7N9 viruses were genetically and antigenically distinct from previous H7N9 viruses. Therefore, a new candidate vaccine virus(CVV) derived from a HPAI A/Guangdong/17SF003/2016-like virus was proposed by the World Health Organization(WHO)...
January 4, 2018: Human Vaccines & Immunotherapeutics
https://www.readbyqxmd.com/read/29299533/cooperating-h3n2-influenza-virus-variants-are-not-detectable-in-primary-clinical-samples
#13
Katherine S Xue, Alexander L Greninger, Ailyn Pérez-Osorio, Jesse D Bloom
The high mutation rates of RNA viruses lead to rapid genetic diversification, which can enable cooperative interactions between variants in a viral population. We previously described two distinct variants of H3N2 influenza virus that cooperate in cell culture. These variants differ by a single mutation, D151G, in the neuraminidase protein. The D151G mutation reaches a stable frequency of about 50% when virus is passaged in cell culture. However, it is unclear whether selection for the cooperative benefits of D151G is a cell culture phenomenon or whether the mutation is also sometimes present at appreciable frequency in virus populations sampled directly from infected humans...
January 2018: MSphere
https://www.readbyqxmd.com/read/29299528/human-clade-2-3-4-4-a-h5n6-influenza-virus-lacks-mammalian-adaptation-markers-and-does-not-transmit-via-the-airborne-route-between-ferrets
#14
Sander Herfst, Chris K P Mok, Judith M A van den Brand, Stefan van der Vliet, Miruna E Rosu, Monique I Spronken, Zifeng Yang, Dennis de Meulder, Pascal Lexmond, Theo M Bestebroer, J S Malik Peiris, Ron A M Fouchier, Mathilde Richard
Since their emergence in 1997, A/H5N1 influenza viruses of the A/goose/Guangdong/1/96 lineage have diversified in multiple genetic and antigenic clades upon continued circulation in poultry in several countries in Eurasia and Africa. Since 2009, reassortant viruses carrying clade 2.3.4.4 hemagglutinin (HA) and internal and neuraminidase (NA) genes of influenza A viruses of different avian origin have been detected, yielding various HA-NA combinations, such as A/H5N1, A/H5N2, A/H5N3, A/H5N5, A/H5N6, and A/H5N8...
January 2018: MSphere
https://www.readbyqxmd.com/read/29297852/predominance-of-influenza-a-h3n2-viruses-during-the-2016-2017-season-in-bulgaria
#15
Neli Korsun, Svetla Angelova, Ivelina Trifonova, Iren Tzotcheva, Sirma Mileva, Silvia Voleva, Irina Georgieva, Penka Perenovska
PURPOSE: Influenza viruses are characterised by high variability, which makes them able to cause annual epidemics. The aim of this study is to determine the antigenic and genetic characteristics of influenza viruses circulating in Bulgaria during the 2016/2017 season. METHODOLOGY: The detection and typing/subtyping of influenza viruses were performed using real time RT-PCR. Results of antigenic characterisation, phylogenetic and amino acid sequence analyses of representative influenza strains are presented herein...
January 3, 2018: Journal of Medical Microbiology
https://www.readbyqxmd.com/read/29289600/a-novel-small-molecule-displays-two-different-binding-modes-during-inhibiting-h1n1-influenza-a-virus-neuraminidases
#16
Shanshan Guan, Yan Xu, Yongbo Qiao, Ziyu Kuai, Mengdan Qian, Xiaoyu Jiang, Song Wang, Hao Zhang, Wei Kong, Yaming Shan
Neuraminidase (NA) inhibitors can suppress NA activity to block the release of progeny virions and are effective against influenza viruses. As potential anti-flu drugs with unique functions, NA inhibitors are greatly concerned by the worldwide scientists. It has been reported recently that one of the novel quindoline derivatives named 7a, could inhibit both A/Puerto Rico/8/34 (H1N1) NA (NAPR) and A/California/04/09 (H1N1) NA (NACA). However, potential structure differences in the active site could be easily detected between the NAPR and NACA according to the flexibilities of their 150-loops located catalytic site...
December 28, 2017: Journal of Structural Biology
https://www.readbyqxmd.com/read/29287704/anti-pandemic-influenza-a-h1n1-virus-potential-of-catechin-and-gallic-acid
#17
Huey-Ling You, Chao-Chun Huang, Chung-Jen Chen, Cheng-Chin Chang, Pei-Lin Liao, Sheng-Teng Huang
BACKGROUND: The pandemic influenza A (H1N1) virus has spread worldwide and infected a large proportion of the human population. Discovery of new and effective drugs for the treatment of influenza is a crucial issue for the global medical community. According to our previous study, TSL-1, a fraction of the aqueous extract from the tender leaf of Toonasinensis, has demonstrated antiviral activities against pandemic influenza A (H1N1) through the down-regulation of adhesion molecules and chemokine to prevent viral attachment...
December 26, 2017: Journal of the Chinese Medical Association: JCMA
https://www.readbyqxmd.com/read/29284320/clinical-and-virologic-effects-of-four-neuraminidase-inhibitors-in-influenza-a-virus-infected-children-aged-4-12-years-an-open-label-randomized-study-in-japan
#18
Nobuo Hirotsu, Yutaka Saisho, Takahiro Hasegawa, Takao Shishido
BACKGROUND: Neuraminidase inhibitors (NAIs) reduce influenza symptoms but clear evidence of relationships between viral titer reduction and symptom alleviation is lacking. This open-label, randomized study evaluated differences in viral dynamics between NAIs, and relationships between viral dynamics and influenza symptoms (trial registration number: UMIN000012670). METHODS: Patients (n = 123) aged 4-12 years with influenza A virus infection were randomized to intravenous peramivir, oral oseltamivir, inhaled zanamivir, or inhaled laninamivir...
December 29, 2017: Expert Review of Anti-infective Therapy
https://www.readbyqxmd.com/read/29282218/a-novel-role-for-the-macrophage-galactose-type-lectin-mgl-receptor-in-mediating-von-willebrand-factor-clearance
#19
Soracha E Ward, Jamie M O'Sullivan, Clive Drakeford, Sonia Aguila, Christopher N Jondle, Jyotika Sharma, Padraic G Fallon, Teresa M Brophy, Roger J S Preston, Paul Smyth, Orla Sheils, Alain Chion, James S O'Donnell
Previous studies have shown that loss of terminal sialic acid causes enhanced VWF clearance through the Ashwell-Morrell receptor (AMR). In this study we investigated (i) the specific importance of N- versus O-linked sialic acid in protecting against VWF clearance (ii) whether additional receptors contribute to the reduced half-life of hyposialylated VWF. α2-3 linked sialic acid accounts for <20% of total sialic acid and is predominantly expressed on VWF O-glycans. Nevertheless, specific digestion with α2-3 neuraminidase (α2-3Neu-VWF) was sufficient to cause markedly enhanced VWF clearance...
December 27, 2017: Blood
https://www.readbyqxmd.com/read/29277445/biased-g-protein-coupled-receptor-agonism-mediates-neu1-sialidase-and-matrix-metalloproteinase-9-crosstalk-to-induce-transactivation-of-insulin-receptor-signaling
#20
Fiona Haxho, Sabah Haq, Myron R Szewczuk
G protein-coupled receptors (GPCR) can participate in a number of signaling pathways, and this property led to the concept of biased GPCR agonism. Agonists, antagonists and allosteric modulators can bind to GPCRs in different ways, creating unique conformations that differentially modulate signaling through one or more G proteins. A unique neuromedin B (NMBR) GPCR-signaling platform controlling mammalian neuraminidase-1 (Neu1) and matrix metalloproteinase-9 (MMP9) crosstalk has been reported in the activation of the insulin receptor (IR) through the modification of the IR glycosylation...
December 24, 2017: Cellular Signalling
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