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https://www.readbyqxmd.com/read/29775667/identification-of-novel-hla-a11-restricted-t-cell-epitopes-in-the-ebola-virus-nucleoprotein
#1
Dan Li, Pei Li, Nianping Song, Yuting Jiang, Yang Zeng, Guangyu Zhao, Yunzhi Fa, Huahu Ye, Yuchun Lone, Yusen Zhou, Shihui Sun, Lin Zeng
The Ebola virus (EBOV) is a very contagious virus that is highly fatal in humans and animals. The largest epidemic was in West Africa in 2014, in which over 11,000 people died. However, to date, there are no licensed vaccines against it. Studies show that CD4+ and CD8+ T-cell responses, especially cytotoxic T-lymphocyte (CTL) responses, play key roles in protecting individuals from EBOV infection. Since HLA-restricted epitope vaccines are likely to be effective and safe immunization strategies for infectious diseases, the present study screened for CTL epitopes in the EBOV-nucleoprotein that are restricted by HLA-A11 (a common allele in Chinese people)...
May 15, 2018: Microbes and Infection
https://www.readbyqxmd.com/read/29772717/a-rapid-screen-for-host-encoded-mirnas-with-inhibitory-effects-against-ebola-virus-using-a-transcription-and-replication-competent-virus-like-particle-system
#2
Zhongyi Wang, Jiaming Li, Yingying Fu, Zongzheng Zhao, Chunmao Zhang, Nan Li, Jingjing Li, Hongliang Cheng, Xiaojun Jin, Bing Lu, Zhendong Guo, Jun Qian, Linna Liu
MicroRNAs (miRNAs) may become efficient antiviral agents against the Ebola virus (EBOV) targeting viral genomic RNAs or transcripts. We previously conducted a genome-wide search for differentially expressed miRNAs during viral replication and transcription. In this study, we established a rapid screen for miRNAs with inhibitory effects against EBOV using a tetracistronic transcription- and replication-competent virus-like particle (trVLP) system. This system uses a minigenome comprising an EBOV leader region, luciferase reporter, VP40, GP, VP24, EBOV trailer region, and three noncoding regions from the EBOV genome and can be used to model the life cycle of EBOV under biosafety level (BSL) 2 conditions...
May 16, 2018: International Journal of Molecular Sciences
https://www.readbyqxmd.com/read/29770047/emerging-infectious-diseases-prediction-and-detection
#3
N H Ogden, P AbdelMalik, Jrc Pulliam
Emerging infectious diseases (EIDs), including West Nile virus, severe acute respiratory syndrome (SARS) and Lyme disease, have had a direct effect within Canada, while many more EIDs such as Zika, chikungunya and Ebola are a threat to Canadians while travelling. Over 75% of EIDs affecting humans are, or were originally, zoonoses (infectious diseases transmitted from animals to humans). There are two main ways by which infectious diseases can emerge: by changes in their geographical ranges and by adaptive emergence, a genetic change in a microorganism that results in it becoming capable of invading a new niche, often by jumping to a new host species such as humans...
October 5, 2017: Canada Communicable Disease Report, Relevé des Maladies Transmissibles Au Canada
https://www.readbyqxmd.com/read/29766839/status-quality-and-specific-needs-of-ebola-virus-diagnostic-capacity-and-capability-in-laboratories-of-the-two-european-preparedness-laboratory-networks-emerge-and-evd-labnet
#4
Chantal B Reusken, Ramona Mögling, Pieter W Smit, Roland Grunow, Giuseppe Ippolito, Antonino Di Caro, Marion Koopmans
From December 2013 to March 2016, West Africa experienced the largest Ebola virus (EBOV) outbreak to date, leading to a European-wide activation of laboratory preparedness and response. At the end of the outbreak, laboratories associated with the two European preparedness networks of expert laboratories EMERGE JA and EVD-LabNet were invited to participate in an assessment of the response of European laboratories to the EBOV outbreak, to identify learning points and training needs to strengthen future outbreak responses...
May 2018: Euro Surveillance: Bulletin Européen sur les Maladies Transmissibles, European Communicable Disease Bulletin
https://www.readbyqxmd.com/read/29764410/changes-in-risk-perceptions-during-the-2014-ebola-virus-disease-epidemic-results-of-two-consecutive-surveys-among-the-general-population-in-lower-saxony-germany
#5
Julie Obenauer, Nicole Rübsamen, Ekaterine Garsevanidze, André Karch, Rafael T Mikolajczyk
BACKGROUND: The Ebola virus disease (EVD) outbreak 2014 received extensive news media coverage, which faded out before the outbreak ended. News media coverage impacts risk perception; it is, however, unclear if the components of risk perception (affective and cognitive responses) change differently over time. METHODS: In an online panel, we asked participants (n = 1376) about EVD risk perceptions at the epidemic's peak (November 2014) and after news media coverage faded out (August 2015)...
May 15, 2018: BMC Public Health
https://www.readbyqxmd.com/read/29764104/the-response-to-and-impact-of-the-ebola-epidemic-towards-an-agenda-for-interdisciplinary-research
#6
Michael Calnan, Erica W Gadsby, Mandy Kader Kondé, Abdourahime Diallo, Jeremy S Rossman
BACKGROUND: The 2013-2016 Ebola virus disease (EVD) epidemic in West Africa was the largest in history and resulted in a huge public health burden and significant social and economic impact in those countries most affected. Its size, duration and geographical spread presents important opportunities for research than might help national and global health and social care systems to better prepare for and respond to future outbreaks. This paper examines research needs and research priorities from the perspective of those who directly experienced the EVD epidemic in Guinea...
September 3, 2017: International Journal of Health Policy and Management
https://www.readbyqxmd.com/read/29757706/the-vesicular-stomatitis-virus-based-ebola-virus-vaccine-from-concept-to-clinical-trials
#7
Ellen Suder, Wakako Furuyama, Heinz Feldmann, Andrea Marzi, Emmie de Wit
The devastating Ebola virus (EBOV) epidemic in West Africa in 2013-2016 accelerated the progress of several vaccines and antivirals through clinical trials, including the replication-competent vesicular stomatitis virus-based vaccine expressing the EBOV glycoprotein (VSV-EBOV). Extensive preclinical testing in animal models demonstrated the prophylactic and post-exposure efficacy of this vaccine, identified the mechanism of protection, and suggested it was safe for human use. Based on these data, VSV-EBOV was extensively tested in phase 1-3 clinical trials in North America, Europe and Africa...
May 14, 2018: Human Vaccines & Immunotherapeutics
https://www.readbyqxmd.com/read/29748487/structural-transition-and-antibody-binding-of-ebov-gp-and-zikv-e-proteins-from-pre-fusion-to-fusion-initiation-state
#8
Anna Lappala, Wataru Nishima, Jacob Miner, Paul Fenimore, Will Fischer, Peter Hraber, Ming Zhang, Benjamin McMahon, Chang-Shung Tung
Membrane fusion proteins are responsible for viral entry into host cells—a crucial first step in viral infection. These proteins undergo large conformational changes from pre-fusion to fusion-initiation structures, and, despite differences in viral genomes and disease etiology, many fusion proteins are arranged as trimers. Structural information for both pre-fusion and fusion-initiation states is critical for understanding virus neutralization by the host immune system. In the case of Ebola virus glycoprotein (EBOV GP) and Zika virus envelope protein (ZIKV E), pre-fusion state structures have been identified experimentally, but only partial structures of fusion-initiation states have been described...
May 10, 2018: Biomolecules
https://www.readbyqxmd.com/read/29742435/recently-identified-mutations-in-the-ebola-virus-makona-genome-do-not-alter-pathogenicity-in-animal-models
#9
Andrea Marzi, Spencer Chadinah, Elaine Haddock, Friederike Feldmann, Nicolette Arndt, Cynthia Martellaro, Dana P Scott, Patrick W Hanley, Tolbert G Nyenswah, Samba Sow, Moses Massaquoi, Heinz Feldmann
Ebola virus (EBOV), isolate Makona, the causative agent of the West African EBOV epidemic, has been the subject of numerous investigations to determine the genetic diversity and its potential implication for virus biology, pathogenicity, and transmissibility. Despite various mutations that have emerged over time through multiple human-to-human transmission chains, their biological relevance remains questionable. Recently, mutations in the glycoprotein GP and polymerase L, which emerged and stabilized early during the outbreak, have been associated with improved viral fitness in cell culture...
May 8, 2018: Cell Reports
https://www.readbyqxmd.com/read/29742004/cross-sectional-study-on-acceptability-of-the-media-channels-about-ebola-virus-disease-in-guangzhou-china
#10
Weisi Liu, Zhoubin Zhang, Jiamin Chen, Xiaojin You
OBJECTIVES: The purpose of this study was to explore the relationship between the information seeking about Ebola virus disease (EVD) and media channels, then to provide theory evidence for working out the health education transmission strategy in similar public health emergency events. MATERIALS AND METHODS: We used a cross-sectional survey model, data were collected through questionnaire over telephone calls, and R × c chi-square test was used to identify factors associated with knowledge and media channels for choosing to get the information about EVD prevention and control...
May 9, 2018: Vector Borne and Zoonotic Diseases
https://www.readbyqxmd.com/read/29741894/structures-of-ebolavirus-glycoprotein-complexes-with-tricyclic-antidepressant-and-antipsychotic-drugs
#11
Yuguang Zhao, Jingshan Ren, Elizabeth Evelyn Fry, Julia Xiao, Alain R Townsend, David I Stuart
A large number of Food and Drug Administration (FDA) approved drugs have been found to inhibit cell entry of Ebola virus (EBOV). However, since these drugs have various primary pharmacological targets their mechanisms of action against EBOV remain largely unknown. We have previously shown that six FDA approved drugs inhibit EBOV infection by interacting with and destabilizing the viral glycoprotein (GP). Here we show that the antidepressants imipramine and clomipramine, and antipsychotic drug thioridazine also directly interact with EBOV GP, and determine the mode of interaction by crystallographic analysis of the complexes...
May 9, 2018: Journal of Medicinal Chemistry
https://www.readbyqxmd.com/read/29736037/broadly-neutralizing-antibodies-from-human-survivors-target-a-conserved-site-in-the-ebola-virus-glycoprotein-hr2-mper-region
#12
Andrew I Flyak, Natalia Kuzmina, Charles D Murin, Christopher Bryan, Edgar Davidson, Pavlo Gilchuk, Christopher P Gulka, Philipp A Ilinykh, Xiaoli Shen, Kai Huang, Palaniappan Ramanathan, Hannah Turner, Marnie L Fusco, Rebecca Lampley, Nurgun Kose, Hannah King, Gopal Sapparapu, Benjamin J Doranz, Thomas G Ksiazek, David W Wright, Erica Ollmann Saphire, Andrew B Ward, Alexander Bukreyev, James E Crowe
Ebola virus (EBOV) in humans causes a severe illness with high mortality rates. Several strategies have been developed in the past to treat EBOV infection, including the antibody cocktail ZMapp, which has been shown to be effective in nonhuman primate models of infection 1 and has been used under compassionate-treatment protocols in humans 2 . ZMapp is a mixture of three chimerized murine monoclonal antibodies (mAbs)3-6 that target EBOV-specific epitopes on the surface glycoprotein7,8 . However, ZMapp mAbs do not neutralize other species from the genus Ebolavirus, such as Bundibugyo virus (BDBV), Reston virus (RESTV) or Sudan virus (SUDV)...
May 7, 2018: Nature Microbiology
https://www.readbyqxmd.com/read/29732571/inactivation-of-ebola-virus-and-middle-east-respiratory-syndrome-coronavirus-in-platelet-concentrates-and-plasma-by-ultraviolet-c-light-and-methylene-blue-plus-visible-light-respectively
#13
Markus Eickmann, Ute Gravemann, Wiebke Handke, Frank Tolksdorf, Stefan Reichenberg, Thomas H Müller, Axel Seltsam
BACKGROUND: Ebola virus (EBOV) and Middle East respiratory syndrome coronavirus (MERS-CoV) have been identified as potential threats to blood safety. This study investigated the efficacy of the THERAFLEX UV-Platelets and THERAFLEX MB-Plasma pathogen inactivation systems to inactivate EBOV and MERS-CoV in platelet concentrates (PCs) and plasma, respectively. STUDY DESIGN AND METHODS: PCs and plasma were spiked with high titers of cell culture-derived EBOV and MERS-CoV, treated with various light doses of ultraviolet C (UVC; THERAFLEX UV-Platelets) or methylene blue (MB) plus visible light (MB/light; THERAFLEX MB-Plasma), and assessed for residual viral infectivity...
May 6, 2018: Transfusion
https://www.readbyqxmd.com/read/29730487/interaction-of-monomeric-ebola-vp40-protein-with-a-plasma-membrane-a-coarse-grained-molecular-dynamics-cgmd-simulation-study
#14
Mohamad Ariff Mohamad Yusoff, Azzmer Azzar Abdul Hamid, Noraslinda Mohammad Bunori, Khairul Bariyyah Abd Halim
Ebola virus is a lipid-enveloped filamentous virus that affects human and non-human primates and consists of several types of protein: nucleoprotein, VP30, VP35, L protein, VP40, VP24, and transmembrane glycoprotein. Among the Ebola virus proteins, its matrix protein VP40 is abundantly expressed during infection and plays a number of critical roles in oligomerization, budding and egress from the host cell. VP40 exists predominantly as a monomer at the inner leaflet of the plasma membrane, and has been suggested to interact with negatively charged lipids such as phosphatidylinositol 4,5-bisphosphate (PIP2 ) and phosphatidylserine (PS) via its cationic patch...
April 23, 2018: Journal of Molecular Graphics & Modelling
https://www.readbyqxmd.com/read/29725132/post-exposure-treatments-for-ebola-and-marburg-virus-infections
#15
Robert W Cross, Chad E Mire, Heinz Feldmann, Thomas W Geisbert
This corrects the article DOI: 10.1038/nrd.2017.251.
May 4, 2018: Nature Reviews. Drug Discovery
https://www.readbyqxmd.com/read/29719780/establishment-of-pseudovirus-infection-mouse-models-for-in-vivo-pharmacodynamics-evaluation-of-filovirus-entry-inhibitors
#16
Qing Chen, Ke Tang, Xiaoyu Zhang, Panpan Chen, Ying Guo
Filoviruses cause severe and fatal viral hemorrhagic fever in humans. Filovirus research has been extensive since the 2014 Ebola outbreak. Due to their high pathogenicity and mortality, live filoviruses require Biosafety Level-4 (BSL-4) facilities, which have restricted the development of anti-filovirus vaccines and drugs. An HIV-based pseudovirus cell infection assay is widely used for viral entry studies in BSL-2 conditions. Here, we successfully constructed nine in vitro pseudo-filovirus models covering all filovirus genera and three in vivo pseudo-filovirus-infection mouse models using Ebola virus, Marburg virus, and Lloviu virus as representative viruses...
March 2018: Acta Pharmaceutica Sinica. B
https://www.readbyqxmd.com/read/29717011/statins-suppress-ebola-virus-infectivity-by-interfering-with-glycoprotein-processing
#17
Punya Shrivastava-Ranjan, Mike Flint, Éric Bergeron, Anita K McElroy, Payel Chatterjee, César G Albariño, Stuart T Nichol, Christina F Spiropoulou
Ebola virus (EBOV) infection is a major public health concern due to high fatality rates and limited effective treatments. Statins, widely used cholesterol-lowering drugs, have pleiotropic mechanisms of action and were suggested as potential adjunct therapy for Ebola virus disease (EVD) during the 2013-2016 outbreak in West Africa. Here, we evaluated the antiviral effects of statin (lovastatin) on EBOV infection in vitro Statin treatment decreased infectious EBOV production in primary human monocyte-derived macrophages and in the hepatic cell line Huh7...
May 1, 2018: MBio
https://www.readbyqxmd.com/read/29709562/novel-cyclo-peptides-inhibit-ebola-pseudotyped-virus-entry-by-targeting-primed-gp-protein
#18
Quanjie Li, Ling Ma, Dongrong Yi, Han Wang, Jing Wang, Yongxin Zhang, Ying Guo, Xiaoyu Li, Jinming Zhou, Yi Shi, George F Gao, Shan Cen
Ebola virus (EBOV) causes fatal hemorrhagic fever with high death rates in human. Currently, there are no available clinically-approved prophylactic or therapeutic treatments. The recently solved crystal structure of cleavage-primed EBOV glycoprotein (GPcl) in complex with the C domain of endosomal protein Niemann-Pick C1 (NPC1) provides a new target for the development of EBOV entry inhibitors. In this work, a computational approach using docking and molecular dynamic simulations is carried out for the rational design of peptide inhibitors...
April 27, 2018: Antiviral Research
https://www.readbyqxmd.com/read/29707974/mass-spectrometric-analysis-of-glycosylated-viral-proteins
#19
David J Harvey
Viral diseases contribute much to human and animal suffering and enormous efforts are directed at developing appropriate vaccines for protection. Glycoproteins constitute much of the viral surfaces and are obvious targets for such vaccine development. This review describes mass spectrometric methods used for the structural determination of these compounds. Areas covered: The review describes the structures of the N- and O-linked glycans found on glycoproteins and mass spectrometric methods for their ionization and fragmentation...
April 30, 2018: Expert Review of Proteomics
https://www.readbyqxmd.com/read/29707637/guns-germs-and-trees-determine-density-and-distribution-of-gorillas-and-chimpanzees-in-western-equatorial-africa
#20
Samantha Strindberg, Fiona Maisels, Elizabeth A Williamson, Stephen Blake, Emma J Stokes, Rostand Aba'a, Gaspard Abitsi, Anthony Agbor, Ruffin D Ambahe, Parfait C Bakabana, Martha Bechem, Antoine Berlemont, Bruno Bokoto de Semboli, Patrick R Boundja, Nicolas Bout, Thomas Breuer, Genevieve Campbell, Pauwel De Wachter, Marc Ella Akou, Fidel Esono Mba, Anna T C Feistner, Bernard Fosso, Roger Fotso, David Greer, Clement Inkamba-Nkulu, Calixte F Iyenguet, Kathryn J Jeffery, Max Kokangoye, Hjalmar S Kühl, Stephanie Latour, Bola Madzoke, Calixte Makoumbou, Guy-Aimé F Malanda, Richard Malonga, Victor Mbolo, David B Morgan, Prosper Motsaba, Gabin Moukala, Brice S Mowawa, Mizuki Murai, Christian Ndzai, Tomoaki Nishihara, Zacharie Nzooh, Lilian Pintea, Amy Pokempner, Hugo J Rainey, Tim Rayden, Heidi Ruffler, Crickette M Sanz, Angelique Todd, Hilde Vanleeuwe, Ashley Vosper, Ymke Warren, David S Wilkie
We present a range-wide assessment of sympatric western lowland gorillas Gorilla gorilla gorilla and central chimpanzees Pan troglodytes troglodytes using the largest survey data set ever assembled for these taxa: 59 sites in five countries surveyed between 2003 and 2013, totaling 61,000 person-days of fieldwork. We used spatial modeling to investigate major drivers of great ape distribution and population trends. We predicted density across each taxon's geographic range, allowing us to estimate overall abundance: 361,900 gorillas and 128,700 chimpanzees in Western Equatorial Africa-substantially higher than previous estimates...
April 2018: Science Advances
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