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https://www.readbyqxmd.com/read/29325819/explanations-for-the-high-potency-of-hpv-prophylactic-vaccines
#1
John Schiller, Doug Lowy
HPV L1 virus-like particle (VLP) vaccines administered in a prime/boost series of three injections over six months have demonstrated remarkable prophylactic efficacy in clinical trials and effectiveness in national immunization programs with high rates of coverage. There is mounting evidence that the vaccines have similar efficacy and effectiveness even when administered in a single dose. The unexpected potency of one dose of these VLP vaccines may largely be attributed to structural features of the particles, which lead to the efficient generation of long-lived antigen-specific antibody-producing cells and unique features of the virus life cycle that make the HPV virions highly susceptible to antibody-mediated inhibition of infection...
January 8, 2018: Vaccine
https://www.readbyqxmd.com/read/29324834/experimental-transmission-of-west-nile-virus-and-rift-valley-fever-virus-by-culex-pipiens-from-lebanon
#2
Renée Zakhia, Laurence Mousson, Marie Vazeille, Nabil Haddad, Anna-Bella Failloux
West Nile virus (WNV) and Rift Valley fever virus (RVFV) are two emerging arboviruses transmitted by Culex pipiens species that includes two biotypes: pipiens and molestus. In Lebanon, human cases caused by WNV and RVFV have never been reported. However, the introduction of these viruses in the country is likely to occur through the migratory birds and animal trades. In this study, we evaluated the ability of Cx. pipiens, a predominant mosquito species in urban and rural regions in Lebanon, to transmit WNV and RVFV...
January 11, 2018: PLoS Neglected Tropical Diseases
https://www.readbyqxmd.com/read/29324805/intranasal-vaccination-with-m2e5x-virus-like-particles-induces-humoral-and-cellular-immune-responses-conferring-cross-protection-against-heterosubtypic-influenza-viruses
#3
Young-Tae Lee, Eun-Ju Ko, Youri Lee, Ki-Hye Kim, Min-Chul Kim, Yu-Na Lee, Sang-Moo Kang
Current influenza vaccines do not provide broad cross-protection. Here, we report that intranasal vaccination with virus-like particles containing the highly conserved multiple ectodomains of matrix protein 2 (M2e5x VLP) of influenza virus induces broad cross-protection by M2-specific humoral and cellular immune responses. M2e5x VLP intranasal vaccination prevented severe weight loss, attenuated inflammatory cytokines and cellular infiltrates, and lowered viral loads, and induced germinal center phenotypic B and plasma cells...
2018: PloS One
https://www.readbyqxmd.com/read/29323105/enterovirus-d68-virus-like-particles-expressed-in-pichia-pastoris-potently-induce-neutralizing-antibody-responses-and-confer-protection-against-lethal-viral-infection-in-mice
#4
Chao Zhang, Xueyang Zhang, Wei Zhang, Wenlong Dai, Jing Xie, Liping Ye, Hongli Wang, Huan Chen, Qingwei Liu, Sitang Gong, Lanlan Geng, Zhong Huang
Enterovirus D68 (EV-D68) has been increasingly associated with severe respiratory illness and neurological complications in children worldwide. However, no vaccine is currently available to prevent EV-D68 infection. In the present study, we investigated the possibility of developing a virus-like particle (VLP)-based EV-D68 vaccine. We found that co-expression of the P1 precursor and 3CD protease of EV-D68 in Pichia pastoris yeast resulted in the generation of EV-D68 VLPs, which were composed of processed VP0, VP1, and VP3 capsid proteins and were visualized as ~30 nm spherical particles...
January 10, 2018: Emerging Microbes & Infections
https://www.readbyqxmd.com/read/29322100/bglbrick-strategy-for-the-construction-of-single-domain-antibody-fusions
#5
Ellen R Goldman, Aeris Broussard, George P Anderson, Jinny L Liu
Single domain antibodies, recombinantly expressed variable domains derived from camelid heavy chain antibodies, are often expressed as multimers for detection and therapeutic applications. Constructs in which several single domain antibodies are genetically fused serially, as well as those in which single domain antibodies are genetically linked with domains that naturally form multimers, yield improvement in apparent binding affinity due to avidity. Here, using a single domain antibody that binds envelope protein from the Dengue virus, we demonstrated the construction of single domain antibody dimers using the Bglbrick cloning strategy...
December 2017: Heliyon
https://www.readbyqxmd.com/read/29313023/virus-like-particles-next-generation-nanoparticles-for-targeted-therapeutic-delivery
#6
REVIEW
Marcus J Rohovie, Maya Nagasawa, James R Swartz
Most drug therapies distribute the agents throughout the entire body, even though the drugs are typically only needed at specific tissues. This often limits dosage and causes discomfort and harmful side-effects. Significant research has examined nanoparticles (NPs) for use as targeted delivery vehicles for therapeutic cargo, however, major clinical success has been limited. Current work focuses mainly on liposomal and polymer-based NPs, but emerging research is exploring the engineering of viral capsids as noninfectious protein-based NPs-termed virus-like particles (VLPs)...
March 2017: Bioengineering & Translational Medicine
https://www.readbyqxmd.com/read/29309412/a-tetravalent-virus-like-particle-vaccine-designed-to-display-domain-iii-of-dengue-envelope-proteins-induces-multi-serotype-neutralizing-antibodies-in-mice-and-macaques-which-confer-protection-against-antibody-dependent-enhancement-in-ag129-mice
#7
Viswanathan Ramasamy, Upasana Arora, Rahul Shukla, Ankur Poddar, Rajgokul K Shanmugam, Laura J White, Melissa M Mattocks, Rajendra Raut, Ashiya Perween, Poornima Tyagi, Aravinda M de Silva, Siddhartha K Bhaumik, Murali Krishna Kaja, François Villinger, Rafi Ahmed, Robert E Johnston, Sathyamangalam Swaminathan, Navin Khanna
BACKGROUND: Dengue is one of the fastest spreading vector-borne diseases, caused by four antigenically distinct dengue viruses (DENVs). Antibodies against DENVs are responsible for both protection as well as pathogenesis. A vaccine that is safe for and efficacious in all people irrespective of their age and domicile is still an unmet need. It is becoming increasingly apparent that vaccine design must eliminate epitopes implicated in the induction of infection-enhancing antibodies. METHODOLOGY/PRINCIPAL FINDINGS: We report a Pichia pastoris-expressed dengue immunogen, DSV4, based on DENV envelope protein domain III (EDIII), which contains well-characterized serotype-specific and cross-reactive epitopes...
January 8, 2018: PLoS Neglected Tropical Diseases
https://www.readbyqxmd.com/read/29307838/administration-of-co-expressed-penaeus-stylirostris-densovirus-like-particles-and-dsrna-yhv-pro-provide-protection-against-yellow-head-virus-in-shrimp
#8
Rapee Sinnuengnong, Pongsopee Attasart, Duncan R Smith, Sakol Panyim, Wanchai Assavalapsakul
The activation of the innate RNA interference pathway through double-stranded RNAs (dsRNAs) is one of the approaches to protecting shrimp from viruses. Previous studies have shown that injection of specific dsRNAs can successfully inhibit viral infection in shrimp. However, inhibition requires high levels of dsRNA and dsRNA stability in shrimp is limited. Virus-like particles (VLPs) have been applied to deliver nucleic acids into host cells because of the protection of dsRNAs from host endonucleases as well as the target specificity provided by VLPs...
January 4, 2018: Journal of Biotechnology
https://www.readbyqxmd.com/read/29306508/a-virus-like-particle-vaccine-candidate-for-influenza-a-virus-based-on-multiple-conserved-antigens-presented-on-hepatitis-b-tandem-core-particles
#9
Alejandro Ramirez, Stephen Morris, Sophie Maucourant, Isabella D'Ascanio, Vincenzo Crescente, I-Na Lu, Sophie Farinelle, Claude P Muller, Michael Whelan, William Rosenberg
Existing Influenza A virus (IAV) vaccines target variable parts of the virus that may change between seasons. Vaccine design relies on predicting the predominant circulating influenza strains but when there is a mismatch between vaccine and circulating strains, efficacy is sub-optimal. Furthermore, current approaches provide limited protection against emerging influenza strains that may cause pandemics. One solution is to design vaccines that target conserved protein domains of influenza, which remain largely unchanged over time and are likely to be found in emergent variants...
January 3, 2018: Vaccine
https://www.readbyqxmd.com/read/29306169/water-exclosure-treatment-system-wets-an-innovative-device-for-minimizing-beach-closures
#10
John R Reimer, Chin H Wu, Kirsti K Sorsa
A Water Exclosure Treatment System (WETS) is developed and installed to minimize the occurrence of beach closures due to algae and Escherchia coli (E. coli) in an inland lake. WETS consists of an "exclosure" sub-system with a five-sided polypropylene, barrier that excludes offshore lake contaminated water from the swimming area. Inside the exclosure, water is pumped to a portable filtration-ultraviolet treatment sub-system with three components. First, heavy debris like aquatic plants are removed through a strainer...
January 3, 2018: Science of the Total Environment
https://www.readbyqxmd.com/read/29305551/development-and-evaluation-of-a-broad-bead-based-multiplex-immunoassay-to-measure-igg-seroreactivity-against-human-polyomaviruses
#11
Sergio Kamminga, Els van der Meijden, Herman F Wunderink, Antoine Touzé, Hans L Zaaijer, Mariet C W Feltkamp
Introduction The family of polyomaviruses, which cause severe disease in immunocompromised hosts, has expanded substantially in recent years. To accommodate measurement of IgG seroresponses against all currently known human polyomavirus (HPyV), including the Lyon IARC polyomavirus (LIPyV), we extended our custom multiplex bead-based HPyV immunoassay and evaluated the performance of this pan-HPyV immunoassay.Methods VP1 protein of fifteen HPyVs belonging to 13 polyomavirus species were expressed as recombinant glutathione S-transferase (GST) fusion proteins and coupled to fluorescent Luminex beads...
January 5, 2018: Journal of Clinical Microbiology
https://www.readbyqxmd.com/read/29304015/development-of-a-surrogate-neutralization-assay-for-norovirus-vaccine-evaluation-at-the-cellular-level
#12
Xiaoli Wang, Shuxia Wang, Chao Zhang, Yu Zhou, Pei Xiong, Qingwei Liu, Zhong Huang
Noroviruses (NoVs) are the main pathogens responsible for sporadic and epidemic nonbacterial gastroenteritis, causing an estimated 219,000 deaths annually worldwide. There is no commercially available vaccine for NoVs, due partly to the difficulty in establishing NoV cell culture models. The histo-blood group antigen (HBGA) blocking assay is used extensively to assess the protective potential of candidate vaccine-elicited antibodies, but there is still no widely used cellular evaluation model. In this study, we have established a cell line-based NoV vaccine evaluation model through the construction of human α1,2-fucosyltransferase 2-overexpressing 293T (293T-FUT2) cell lines...
January 5, 2018: Viruses
https://www.readbyqxmd.com/read/29300485/tobacco-mosaic-virus-with-peroxidase-like-activity-for-cancer-cells-detection-through-colorimetric-assay
#13
Jiawang Guo, Xia Zhao, Jun Hu, Yuan Lin, Qian Wang
Cell-based ELISA (CELLISA) has been widely used in disease diagnoses due to its simplicity and low cost. Recently, peroxidase-like nanomaterials have emerged as promising systems for CELLISA applications. In this work, Tobacco mosaic virus (TMV) was simultaneously tailored with peroxidase-like inorganic nanoparticles (platinum nanoparticles) and cancer cell target groups (folic acid) to obtain TMV-FA-Pt nanoparticles for cancer cell detection. Induced by the uniformly distributed reactive groups and well-defined structure of the TMV particle, platinum nanoparticles could be grown in situ on the exterior surface of TMV with excellent monodispersity and uniform spatial distribution...
January 4, 2018: Molecular Pharmaceutics
https://www.readbyqxmd.com/read/29300333/atomic-resolution-structures-of-human-bufaviruses-determined-by-cryo-electron-microscopy
#14
Maria Ilyas, Mario Mietzsch, Shweta Kailasan, Elina Väisänen, Mengxiao Luo, Paul Chipman, J Kennon Smith, Justin Kurian, Duncan Sousa, Robert McKenna, Maria Söderlund-Venermo, Mavis Agbandje-McKenna
Bufavirus strain 1 (BuV1), a member of the Protoparvovirus genus of the Parvoviridae, was first isolated from fecal samples of children with acute diarrhea in Burkina Faso. Since this initial discovery, BuVs have been isolated in several countries, including Finland, the Netherlands, and Bhutan, in pediatric patients exhibiting similar symptoms. Towards their characterization, the structures of virus-like particles of BuV1, BuV2, and BuV3, the current known genotypes, have been determined by cryo-electron microscopy and image reconstruction to 2...
January 4, 2018: Viruses
https://www.readbyqxmd.com/read/29300162/production-of-gp64-free-virus-like-particles-from-baculovirus-infected-insect-cells
#15
Lorena C S Chaves, Bergmann M Ribeiro, Gary W Blissard
The retroviral Gag protein is frequently used to generate 'virus-like particles' (VLPs) for a variety of applications. Retroviral Gag proteins self-assemble and bud at the plasma membrane to form enveloped VLPs that resemble natural retrovirus virions, but contain no viral genome. The baculovirus expression vector system has been used to express high levels of the retroviral Gag protein to produce VLPs. However, VLP preparations produced from baculovirus-infected insect cells typically contain relatively large concentrations of baculovirus budded virus (BV) particles, which are similar in size and density to VLPs, and thus may be difficult to separate when purifying VLPs...
January 4, 2018: Journal of General Virology
https://www.readbyqxmd.com/read/29299534/stability-of-the-influenza-virus-hemagglutinin-protein-correlates-with-evolutionary-dynamics
#16
Eili Y Klein, Deena Blumenkrantz, Adrian Serohijos, Eugene Shakhnovich, Jeong-Mo Choi, João V Rodrigues, Brendan D Smith, Andrew P Lane, Andrew Feldman, Andrew Pekosz
Protein thermodynamics are an integral determinant of viral fitness and one of the major drivers of protein evolution. Mutations in the influenza A virus (IAV) hemagglutinin (HA) protein can eliminate neutralizing antibody binding to mediate escape from preexisting antiviral immunity. Prior research on the IAV nucleoprotein suggests that protein stability may constrain seasonal IAV evolution; however, the role of stability in shaping the evolutionary dynamics of the HA protein has not been explored. We used the full coding sequence of 9,797 H1N1pdm09 HA sequences and 16,716 human seasonal H3N2 HA sequences to computationally estimate relative changes in the thermal stability of the HA protein between 2009 and 2016...
January 2018: MSphere
https://www.readbyqxmd.com/read/29299527/a-single-amino-acid-change-in-the-marburg-virus-glycoprotein-arises-during-serial-cell-culture-passages-and-attenuates-the-virus-in-a-macaque-model-of-disease
#17
Kendra J Alfson, Laura E Avena, Jenny Delgado, Michael W Beadles, Jean L Patterson, Ricardo Carrion, Anthony Griffiths
Marburg virus (MARV) causes disease with high case fatality rates, and there are no approved vaccines or therapies. Licensing of MARV countermeasures will likely require approval via the FDA's Animal Efficacy Rule, which requires well-characterized animal models that recapitulate human disease. This includes selection of the virus used for exposure and ensuring that it retains the properties of the original isolate. The consequences of amplification of MARV for challenge studies are unknown. Here, we serially passaged and characterized MARV through 13 passes from the original isolate...
January 2018: MSphere
https://www.readbyqxmd.com/read/29298890/full-length-glycosylated-gag-of-murine-leukemia-virus-can-associate-with-the-viral-envelope-as-a-type-i-integral-membrane-protein
#18
Tyler Milston Renner, Kasandra Bélanger, Cindy Lam, Maria Rosales Gerpe, Joanne Eileen McBane, Marc-André Langlois
The glycosylated Gag protein (gPr80) of murine leukemia viruses (MLVs) has been shown to exhibit multiple roles in facilitating retrovirus release, infection and resistance to host-encoded retroviral restriction factors such as APOBEC3, SERINC3 and SERINC5. One way gPr80 helps MLVs escape host innate immune restriction is by increasing capsid stability, a feature that protects viral replication intermediates from being detected by cytosolic DNA sensors. gPr80 also increases the resistance of MLVs against deamination and restriction by mouse APOBEC3 (mA3)...
January 3, 2018: Journal of Virology
https://www.readbyqxmd.com/read/29298386/diversity-of-dna-and-rna-viruses-in-indoor-air-as-assessed-via-metagenomic-sequencing
#19
Karyna Rosario, Noah Fierer, Shelly Lynn Miller, Julia Luongo, Mya Breitbart
Diverse bacterial and fungal communities inhabit human-occupied buildings and circulate in indoor air; however, viral diversity in these man-made environments remains largely unknown. Here we investigated DNA and RNA viruses circulating in the air of twelve university dormitory rooms by analyzing dust accumulated over a one-year period on heating, ventilation, and air conditioning (HVAC) filters. A high-throughput metagenomic sequencing approach was used to determine the identity and diversity of viral particles extracted from the HVAC filters...
January 3, 2018: Environmental Science & Technology
https://www.readbyqxmd.com/read/29295756/a-virus-like-particle-vaccine-confers-protection-against-enterovirus-d68-lethal-challenge-in-mice
#20
Wenlong Dai, Chao Zhang, Xueyang Zhang, Pei Xiong, Qingwei Liu, Sitang Gong, Lanlan Geng, Dongming Zhou, Zhong Huang
Enterovirus D68 (EV-D68) is increasingly associated with severe acute respiratory infection and acute flaccid myelitis (AFM) in children around the world. However, neither vaccines nor therapeutic drugs are available for EV-D68. Here we report the development of a virus-like particle (VLP) based experimental EV-D68 vaccine. We found that EV-D68 VLPs could be successfully generated in insect cells infected with a recombinant baculovirus co-expressing the P1 precursor and 3CD protease of EV-D68. Biochemical and electron microscopic analyses revealed that EV-D68 VLPs were composed of VP0, VP1, and VP3 capsid proteins derived from precursor P1 and were visualized as spherical particles of ∼30 nm in diameter...
December 30, 2017: Vaccine
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