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https://www.readbyqxmd.com/read/27936463/virus-like-particles-displaying-h5-h7-h9-hemagglutinins-and-n1-neuraminidase-elicit-protective-immunity-to-heterologous-avian-influenza-viruses-in-chickens
#1
Peter Pushko, Irina Tretyakova, Rachmat Hidajat, Aniko Zsak, Klaudia Chrzastek, Terrence M Tumpey, Darrell R Kapczynski
Avian influenza (AI) viruses circulating in wild birds pose a serious threat to public health. Human and veterinary vaccines against AI subtypes are needed. Here we prepared triple-subtype VLPs that co-localized H5, H7 and H9 antigens derived from H5N1, H7N3 and H9N2 viruses. VLPs also contained influenza N1 neuraminidase and retroviral gag protein. The H5/H7/H9/N1/gag VLPs were prepared using baculovirus expression. Biochemical, functional and antigenic characteristics were determined including hemagglutination and neuraminidase enzyme activities...
December 6, 2016: Virology
https://www.readbyqxmd.com/read/27934118/unexpected-electrophoretic-behavior-of-complexes-between-rod-like-virions-and-bivalent-antibodies
#2
Stanislav S Beloborodov, Vasily G Panferov, Irina V Safenkova, Svetlana M Krylova, Boris B Dzantiev, Sergey N Krylov
Here we report on the unexpected electrophoretic behavior of complexes between rod-like virus particles (virions) and bivalent antibodies. The multiple complexes formed by the virions and antibodies migrated with electrophoretic mobilities of much greater absolute values than those of the unbound virions or antibodies while typically complexes have mobilities intermediate to those of their components. We hypothesized that the mobilities of unusually high absolute values are caused by the cross-linking of virions by bivalent antibodies into aggregates with prominent side-to-side binding...
December 6, 2016: Analytical Chemistry
https://www.readbyqxmd.com/read/27932311/daclatasvir-prevents-hepatitis-c-virus-by-blocking-transfer-of-viral-genome-to-assembly-sites
#3
Bertrand Boson, Solène Denolly, Fanny Turlure, Christophe Chamot, Marlène Dreux, François-Loïc Cosset
BACKGROUND & AIMS: Daclatasvir is a direct-acting antiviral agent and potent inhibitor of NS5A, which is involved in replication of the hepatitis C virus (HCV) genome, presumably via membranous web shaping, and assembly of new virions, likely via transfer of the HCV RNA genome to viral particle assembly sites. Daclatasvir inhibits the formation of new membranous web structures and, ultimately, of replication complex vesicles, but also inhibits an early assembly step. We investigated the relationship between daclatasvir-induced clustering of HCV proteins, intracellular localization of viral RNAs and inhibition of viral particle assembly...
December 5, 2016: Gastroenterology
https://www.readbyqxmd.com/read/27929021/host-genome-integration-and-giant-virus-induced-reactivation-of-the-virophage-mavirus
#4
Matthias G Fischer, Thomas Hackl
Endogenous viral elements are increasingly found in eukaryotic genomes, yet little is known about their origins, dynamics, or function. Here we provide a compelling example of a DNA virus that readily integrates into a eukaryotic genome where it acts as an inducible antiviral defence system. We found that the virophage mavirus, a parasite of the giant Cafeteria roenbergensis virus (CroV), integrates at multiple sites within the nuclear genome of the marine protozoan Cafeteria roenbergensis. The endogenous mavirus is structurally and genetically similar to eukaryotic DNA transposons and endogenous viruses of the Maverick/Polinton family...
December 7, 2016: Nature
https://www.readbyqxmd.com/read/27928912/immune-responses-against-norovirus-gii-4-virus-like-particles-in-mice
#5
H Ushijima, S Machida, A Nomura, P Khamrin, D N Tran, H Nomura, S Hayakawa
Norovirus (NoV) is a causative agent of gastroenteritis in children and adults worldwide. To evaluate the safety and effectiveness of a NoV vaccine candidate, 100 µg of GII.4 NoV-like particles (VLPs) was challenged orally (oral and intrabuccal administration) and by subcutaneous injection without adjuvant in mice. The subcutaneous injection induced IgG in sera, but not IgA in feces. The oral delivery method induced IgA in both sera and feces, but not IgG in sera. However, challenging by the intrabuccal administration induced IgG in sera and IgA in both sera and feces, especially by 2-dose immunization...
2016: Acta Virologica
https://www.readbyqxmd.com/read/27928907/separation-of-hiv-1-gag-virus-like-particles-from-vesicular-particles-impurities-by-hydroxyl-functionalized-monoliths
#6
Petra Steppert, Daniel Burgstaller, Miriam Klausberger, Petra Kramberger, Andres Tover, Eva Berger, Katharina Nöbauer, Ebrahim Razzazi-Fazeli, Alois Jungbauer
The downstream processing of enveloped virus-like particles is very challenging because of the biophysical and structural similarity between correctly assembled particles and contaminating vesicular particles present in the feedstock. We used hydroxyl-functionalized polymethacrylate monoliths, providing hydrophobic and electrostatic binding contributions, for the purification of HIV-1 gag virus-like particles. The clarified culture supernatant was conditioned with ammonium sulfate and after membrane filtration, loaded onto a 1 mL monolith...
December 8, 2016: Journal of Separation Science
https://www.readbyqxmd.com/read/27928019/tlr2-ligation-enhances-hiv-1-replication-in-activated-ccr6-cd4-t-cells-by-increasing-virus-entry-and-establishing-a-more-permissive-environment-to-infection
#7
Jean-François Bolduc, Michel Ouellet, Laurent Hany, Michel J Tremblay
: In this study, we investigated the effect of TLR2 ligation on the permissiveness of activated CD4(+) T cells to HIV-1 infection by focusing our experiments on the relative susceptibility of cell subsets based on their expression of CCR6. Purified primary human CD4(+) T cells were first subjected to a CD3/CD28 costimulation before treatment with the TLR2 agonist Pam3CSK4. Finally, cells were inoculated with R5-tropic HIV-1 particles that permit to study the effect of TLR2 triggering on virus production at both population and single-cell levels...
December 7, 2016: Journal of Virology
https://www.readbyqxmd.com/read/27928010/structural-insights-into-reovirus-%C3%AF-1-interactions-with-two-neutralizing-antibodies
#8
Melanie H Dietrich, Kristen M Ogden, Sarah P Katen, Kerstin Reiss, Danica M Sutherland, Robert H Carnahan, Matthew Goff, Tracy Cooper, Terence S Dermody, Thilo Stehle
: Reovirus attachment protein σ1 engages glycan receptors and junctional adhesion molecule-A (JAM-A) and is thought to undergo a conformational change during the proteolytic disassembly of virions to infectious subvirion particles (ISVPs) that accompanies cell entry. The σ1 protein is also the primary target of neutralizing antibodies. Here we present a structural and functional characterization of two neutralizing antibodies that target σ1 of serotypes 1 (T1) and 3 (T3) reoviruses...
December 7, 2016: Journal of Virology
https://www.readbyqxmd.com/read/27928008/increasing-type-1-poliovirus-capsid-stability-by-thermal-selection
#9
Oluwapelumi O Adeyemi, Clare Nicol, Nicola J Stonehouse, David J Rowlands
: Poliomyelitis is a highly infectious disease caused by poliovirus (PV). It can result in paralysis and may be fatal. Integrated global immunisation programmes using live-attenuated oral (OPV) and/or inactivated PV vaccines (IPV) have systematically reduced its spread and paved the way for eradication. Immunisation will continue post-eradication to ensure against reintroduction of the disease, but there are biosafety concerns for both OPV and IPV. These could be addressed by the production and use of virus-free virus-like particle (VLP) vaccines which mimic the 'empty' capsids (ECs) normally produced in viral infection...
December 7, 2016: Journal of Virology
https://www.readbyqxmd.com/read/27928002/adjuvanting-an-siv-vaccine-with-tlr-ligands-encapsulated-in-nanoparticles-induces-persistent-antibody-responses-and-enhanced-protection-in-trim5%C3%AE-restrictive-macaques
#10
Sudhir Pai Kasturi, Pamela A Kozlowski, Helder I Nakaya, Matheus C Burger, Pedro Russo, Mathew Pham, Yevgeniy Kovalenkov, Eduardo L V Silveira, Colin Havenar-Daughton, Samantha L Burton, Katie M Kilgore, Mathew J Johnson, Rafiq Nabi, Traci Legere, Zarpheen Jinnah Sher, Xuemin Chen, Rama R Amara, Eric Hunter, Steven E Bosinger, Paul Spearman, Shane Crotty, Francois Villinger, Cynthia A Derdeyn, Jens Wrammert, Bali Pulendran
: Our previous work has shown that antigens adjuvanted with specific ligands for toll-like receptor 4 (TLR4) and TLR7/8 encapsulated in poly (lactic-co-glycolic acid) (PLGA) based nanoparticles (NP), induced robust and durable immune responses in mice and macaques. We investigated the efficacy of these NP adjuvants in inducing protective immunity against simian immunodeficiency virus (SIV). Rhesus macaques (RMs) were immunized with NP containing TLR4 and TLR7/8 agonists mixed with soluble recombinant SIVmac239 derived envelope (Env) gp140 and Gag p55 (Protein), or with virus like particles (VLP) containing SIVmac239 Env and Gag...
December 7, 2016: Journal of Virology
https://www.readbyqxmd.com/read/27926826/potential-of-a-bpv1-l1-vlp-vaccine-to-prevent-bpv1-or-bpv2-induced-pseudo-sarcoid-formation-and-safety-and-immunogenicity-of-ecpv2-l1-vlps-in-the-horse
#11
Edmund K Hainisch, Hans Abel-Reichwald, Saeed Shafti-Keramat, Barbara Pratscher, Annunziata Corteggio, Giuseppe Borzacchiello, Maria Wetzig, Christoph Jindra, Alexander Tichy, Reinhard Kirnbauer, Sabine Brandt
We have previously shown that immunization of horses with BPV1 L1 virus-like particles (VLP) is safe and highly immunogenic, and that bovine papillomavirus types 1 and 2 (BPV1, BPV2) are closely related serotypes. Here we evaluated the protective potential of a BPV1 L1 VLP vaccine against experimental BPV1 and BPV2 challenge, and studied the safety and immunogenicity of a bivalent EcPV2/BPV1 L1 VLP vaccine. Fourteen healthy horses were immunized with BPV1 L1 VLPs (100 µg/injection) plus adjuvant on days 0 and 28, whilst seven remained unvaccinated...
December 7, 2016: Journal of General Virology
https://www.readbyqxmd.com/read/27926486/novel-epstein-barr-virus-like-particles-incorporating-gh-gl-ebna1-or-gb-lmp2-induce-high-neutralizing-antibody-titers-and-ebv-specific-t-cell-responses-in-immunized-mice
#12
Elizabeth M Perez, Joslyn Foley, Timelia Tison, Rute Silva, Javier Gordon Ogembo
Previous Epstein-Barr virus (EBV) prophylactic vaccines based on the major surface glycoprotein gp350/220 as an immunogen have failed to block viral infection in humans, suggesting a need to target other viral envelope glycoproteins. In this study, we reasoned that incorporating gH/gL or gB, critical glycoproteins for viral fusion and entry, on the surface of a virus-like particle (VLP) would be more immunogenic than gp350/220 for generating effective neutralizing antibodies to prevent viral infection of both epithelial and B cell lines...
December 1, 2016: Oncotarget
https://www.readbyqxmd.com/read/27923925/biliary-secretion-of-quasi-enveloped-human-hepatitis-a-virus
#13
Asuka Hirai-Yuki, Lucinda Hensley, Jason K Whitmire, Stanley M Lemon
: Hepatitis A virus (HAV) is an unusual picornavirus that is released from cells cloaked in host-derived membranes. These quasi-enveloped virions (eHAV) are the only particle type circulating in blood during infection, whereas only nonenveloped virions are shed in feces. The reason for this is uncertain. Hepatocytes, the only cell type known to support HAV replication in vivo, are highly polarized epithelial cells with basolateral membranes facing onto hepatic (blood) sinusoids and apical membranes abutting biliary canaliculi from which bile is secreted to the gut...
December 6, 2016: MBio
https://www.readbyqxmd.com/read/27920180/whole-inactivated-and-virus-like-particle-vaccine-strategies-for-chikungunya-virus
#14
Adam D DeZure, Nina M Berkowitz, Barney S Graham, Julie E Ledgerwood
Chikungunya virus (CHIKV) is a global public health threat, having been identified in >60 countries in Asia, Africa, Europe, and the Americas. There is no cure for or licensed vaccine against CHIKV infection. Initial attempts at CHIKV vaccine development began in the early 1960s. Whole-inactivated and virus-like particle (VLP) vaccines are 2 of the current approaches being evaluated. Success of these approaches is dependent on a safe, well-tolerated vaccine that is immunogenic and deployable in regard to manufacturing, stability, and delivery characteristics...
December 15, 2016: Journal of Infectious Diseases
https://www.readbyqxmd.com/read/27915283/distributions-and-relationships-of-virio-and-pico-plankton-in-the-epi-meso-and-bathy-pelagic-zones-of-the-western-pacific-ocean
#15
Yantao Liang, Yongyu Zhang, Yao Zhang, Tingwei Luo, Richard B Rivkin, Nianzhi Jiao
Virio- and pico-plankton mediate important biogeochemical processes and the environmental factors which regulates their dynamics and the virus-host interactions are incompletely known, especially in the deep sea. Here we report on their distributions and relationships with environmental factors at 21 stations covering a latitudinal range (2-23(o) N) in the Western Pacific Ocean. This region is characterized by a complex western boundary current system. Synechococcus, autotrophic picoeukaryotes, heterotrophic prokaryotes and virus-like particles (VLPs) were high (<2...
December 2, 2016: FEMS Microbiology Ecology
https://www.readbyqxmd.com/read/27914931/valosin-containing-protein-vcp-p97-plays-a-role-in-the-replication-of-west-nile-virus
#16
Wallaya Phongphaew, Shintaro Kobayashi, Michihito Sasaki, Michael Carr, William W Hall, Yasuko Orba, Hirofumi Sawa
Valosin-containing protein (VCP) is classified as a member of the type II AAA(+) ATPase protein family. VCP functions in several cellular processes, including protein degradation, membrane fusion, vesicular trafficking and disassembly of stress granules. Moreover, VCP is considered to play a role in the replication of several viruses, albeit through different mechanisms. In the present study, we have investigated the role of VCP in West Nile virus (WNV) infection. Endogenous VCP expression was inhibited using either VCP inhibitors or by siRNA knockdown...
November 30, 2016: Virus Research
https://www.readbyqxmd.com/read/27905985/tlr7-8-agonist-induces-a-post-entry-samhd1-independent-block-to-hiv-1-infection-of-monocytes
#17
Henning Hofmann, Bénédicte Vanwalscappel, Nicolin Bloch, Nathaniel R Landau
BACKGROUND: Monocytes, the primary myeloid cell-type in peripheral blood, are resistant to HIV-1 infection as a result of the lentiviral restriction factor SAMHD1. Toll-like receptors recognize microbial pathogen components, inducing the expression of antiviral host proteins and proinflammatory cytokines. TLR agonists that mimic microbial ligands have been found to have activity against HIV-1 in macrophages. The induction of restriction factors in monocytes by TLR agonist activation has not been well studied...
December 1, 2016: Retrovirology
https://www.readbyqxmd.com/read/27903913/functional-rnas-combined-assembly-and-packaging-in-vlps
#18
Po-Yu Fang, Lizzette M Gómez Ramos, Stefany Y Holguin, Chiaolong Hsiao, Jessica C Bowman, Hung-Wei Yang, Loren Dean Williams
We describe here a one pot RNA production, packaging and delivery system based on bacteriophage Qβ. We demonstrate a method for production of a novel RNAi scaffold, packaged within Qβ virus-like particles (VLPs). The RNAi scaffold is a general utility chimera that contains a functional RNA duplex with paired silencing and carrier sequences stabilized by a miR-30 stem-loop. The Qβ hairpin on the 5' end confers affinity for the Qβ coat protein (CP). Silencing sequences can include mature miRNAs and siRNAs, and can target essentially any desired mRNA...
November 29, 2016: Nucleic Acids Research
https://www.readbyqxmd.com/read/27902397/vesivirus-2117-capsids-more-closely-resemble-sapovirus-and-lagovirus-particles-than-other-known-vesivirus-structures
#19
Michaela Conley, Edward Emmott, Richard Orton, David Taylor, Daniel Carneiro, Kazuyoshi Murata, Ian Goodfellow, Grant Hansman, David Bhella
Vesivirus 2117 is an adventitious agent that in 2009, was identified as a contaminant of CHO cells propagated in bioreactors at a pharmaceutical manufacturing plant belonging to Genzyme. The consequent interruption in supply of Fabrazyme and Cerezyme (drugs used to treat Fabry and Gaucher disease respectively), caused significant economic losses. Vesivirus 2117 is a member of the Caliciviridae; a family of small icosahedral viruses encoding a positive sense RNA genome. We have used cryo-electron microscopy and three dimensional image reconstruction to calculate a structure of vesivirus 2117 virus like particles as well as feline calicivirus and a chimeric sapovirus...
November 14, 2016: Journal of General Virology
https://www.readbyqxmd.com/read/27898140/ny-subtyp-av-molluscipoxvirus-p%C3%A3-visad-modern-teknik-identifierar-nya-och-ovanliga-patogener-snabbare
#20
Anna-Lena Hammarin, Yvonne Eklund, Maria Karlberg, Morten Bogh, Per Sikora
Molluscum contagiosum is a viral infection of the epidermis characterized by skin-colored papules or nodules frequently with a central depression. Atypical variants may occur, primarily in immunosuppressed individuals. We here report a case of »giant Molluscum contagiosum« in an immunocompetent child. The patient was presented with a fairly smooth nodule of 2 cm in diameter on the ring finger. Molluscipoxvirus-like virus particles were detected by electron microscopy from the nodule, but since the clinical picture was not compatible with MC, next generation sequencing was performed in order to verify the diagnosis...
November 28, 2016: Läkartidningen
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