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https://www.readbyqxmd.com/read/28213871/thieno-2-3-b-pyridine-derivatives-a-new-class-of-antiviral-drugs-against-mayaro-virus
#1
Raquel Amorim, Marcelo Damião Ferreira de Meneses, Julio Cesar Borges, Luiz Carlos da Silva Pinheiro, Lucio Ayres Caldas, Claudio Cesar Cirne-Santos, Marcos Vinícius Palmeira de Mello, Alessandra Mendonça Teles de Souza, Helena Carla Castro, Izabel Christina Nunes de Palmer Paixão, Renata de Mendonça Campos, Ingrid E Bergmann, Viviana Malirat, Alice Maria Rolim Bernardino, Moacyr Alcoforado Rebello, Davis Fernandes Ferreira
Mayaro virus (MAYV) is an arthropod-borne virus and a member of the family Togaviridae, genus Alphavirus. Its infection leads to an acute illness accompanied by long-lasting arthralgia. To date, there are no antiviral drugs or vaccines against infection with MAYV and resources for the prevention or treatment of other alphaviruses are very limited. MAYV has served as a model to study the antiviral potential of several substances on alphavirus replication. In this work we evaluated the antiviral effect of seven new derivatives of thieno[2,3-b]pyridine against MAYV replication in a mammalian cell line...
February 17, 2017: Archives of Virology
https://www.readbyqxmd.com/read/28207896/rna-seq-analysis-of-chikungunya-virus-infection-and-identification-of-granzyme-a-as-a-major-promoter-of-arthritic-inflammation
#2
Jane A C Wilson, Natalie A Prow, Wayne A Schroder, Jonathan J Ellis, Helen E Cumming, Linden J Gearing, Yee Suan Poo, Adam Taylor, Paul J Hertzog, Francesca Di Giallonardo, Linda Hueston, Roger Le Grand, Bing Tang, Thuy T Le, Joy Gardner, Suresh Mahalingam, Pierre Roques, Phillip I Bird, Andreas Suhrbier
: Chikungunya virus (CHIKV) is an arthritogenic alphavirus causing epidemics of acute and chronic arthritic disease. Herein we describe a comprehensive RNA-Seq analysis of feet and lymph nodes at peak viraemia (day 2 post infection), acute arthritis (day 7) and chronic disease (day 30) in the CHIKV adult wild-type mouse model. Genes previously shown to be up-regulated in CHIKV patients were also up-regulated in the mouse model. CHIKV sequence information was also obtained with up to ≈8% of the reads mapping to the viral genome; however, no adaptive viral genome changes were apparent...
February 2017: PLoS Pathogens
https://www.readbyqxmd.com/read/28206905/discovery-of-a-novel-alphavirus-related-to-eilat-virus
#3
Kyra Hermanns, Florian Zirkel, Anne Kopp, Marco Marklewitz, Innocent B Rwego, Alejandro Estrada, Thomas R Gillespie, Christian Drosten, Sandra Junglen
Most alphaviruses are transmitted by arthropods and infect vertebrate hosts. An exception is Eilat virus (EILV), the only described alphavirus with a host range restricted to insects. We established a new generic reverse transcription PCR assay for alphaviruses and tested 8860 tropical mosquitoes. We detected a novel alphavirus, tentatively named Taï Forest alphavirus (TALV), in Culex decens mosquitoes collected in Ivory Coast. The full genome was sequenced, and closest similarity was found to EILV. Pairwise amino acid identities to EILV ranged between 67 and 88 % for the corresponding proteins, suggesting that TALV defines a proposed new alphavirus species...
January 2017: Journal of General Virology
https://www.readbyqxmd.com/read/28196962/spatial-and-temporal-analysis-of-alphavirus-replication-and-assembly-in-mammalian-and-mosquito-cells
#4
Joyce Jose, Aaron B Taylor, Richard J Kuhn
Sindbis virus (SINV [genus Alphavirus, family Togaviridae]) is an enveloped, mosquito-borne virus. Alphaviruses cause cytolytic infections in mammalian cells while establishing noncytopathic, persistent infections in mosquito cells. Mosquito vector adaptation of alphaviruses is a major factor in the transmission of epidemic strains of alphaviruses. Though extensive studies have been performed on infected mammalian cells, the morphological and structural elements of alphavirus replication and assembly remain poorly understood in mosquito cells...
February 14, 2017: MBio
https://www.readbyqxmd.com/read/28194661/guillain-barre-syndrome-complicating-chikungunya-virus-infection
#5
Ayush Agarwal, Deepti Vibha, Achal Kumar Srivastava, Garima Shukla, Kameshwar Prasad
Chikungunya virus (CHIKV) is a mosquito-borne alphavirus which presents with symptoms of fever, rash, arthralgia, and occasional neurologic disease. While outbreaks have been earlier reported from India and other parts of the world, the recent outbreak in India witnessed more than 1000 cases. Various systemic and rarely neurological complications have been reported with CHIKV. We report two cases of Guillain-Barré syndrome (GBS) with CHIKV. GBS is a rare neurological complication which may occur after subsidence of fever and constitutional symptoms by several neurotropic viruses...
February 13, 2017: Journal of Neurovirology
https://www.readbyqxmd.com/read/28153792/mosquito-borne-viruses-circulating-in-kinshasa-democratic-republic-of-the-congo
#6
Kennedy Makola Mbanzulu, Roger Wumba, Jean-Pierre Kambala Mukendi, Josué Kikana Zanga, Fortunate Shija, Thierry Lengu Bobanga, Michel Ntetani Aloni, Gerald Misinzo
BACKGROUND: Diseases caused by mosquito-borne viruses are among the most important emerging diseases that threaten human and animal health, particularly in Africa. However, little attention has been paid to these diseases in the Democratic Republic of the Congo (DRC). The present cross-sectional study was undertaken between March and May 2014 to investigate the presence of mosquito-borne viruses in mosquitoes collected from five municipalities of Kinshasa, DRC. METHODS: Mosquitoes were collected using BG-Sentinel traps and battery-powered aspirators...
January 30, 2017: International Journal of Infectious Diseases: IJID
https://www.readbyqxmd.com/read/28148838/fingolimod-treatment-abrogates-chikungunya-virus-induced-arthralgia
#7
Teck-Hui Teo, Yi-Hao Chan, Wendy W L Lee, Fok-Moon Lum, Siti Naqiah Amrun, Zhisheng Her, Ravisankar Rajarethinam, Andres Merits, Olaf Rötzschke, Laurent Rénia, Lisa F P Ng
Chikungunya virus (CHIKV) is one of the many rheumatic arthropod-borne alphaviruses responsible for debilitating joint inflammation in humans. Despite the severity in many endemic regions, clinically approved intervention targeting the virus remains unavailable. CD4(+) T cells have been shown to mediate CHIKV-induced joint inflammation in mice. We demonstrate here that transfer of splenic CD4(+) T cells from virus-infected C57BL/6 mice into virus-infected T cell receptor-deficient (TCR(-/-)) mice recapitulated severe joint pathology including inflammation, vascular leakages, subcutaneous edema, and skeletal muscle necrosis...
February 1, 2017: Science Translational Medicine
https://www.readbyqxmd.com/read/28148804/a-microrna-screen-identifies-the-wnt-signaling-pathway-as-a-regulator-of-the-interferon-response-during-flavivirus-infection
#8
Jessica L Smith, Sophia Jeng, Shannon K McWeeney, Alec J Hirsch
: The impact of mosquito-borne flavivirus infections worldwide is significant, and many critical aspects of these viruses' biology, including virus-host interactions, host cell requirements for replication, and how virus-host interactions impact pathology, remain to be fully understood. The recent re-emergence and spread of flaviviruses, including dengue virus (DENV), West Nile virus (WNV), and Zika virus (ZIKV), highlights the importance of performing basic research on this important group of pathogens...
February 1, 2017: Journal of Virology
https://www.readbyqxmd.com/read/28148802/recombinant-isfahan-virus-and-vesicular-stomatitis-virus-vaccine-vectors-provide-durable-multivalent-single-dose-protection-against-lethal-alphavirus-challenge
#9
Farooq Nasar, Demetrius Matassov, Robert L Seymour, Theresa Latham, Rodion V Gorchakov, Rebecca M Nowak, Grace Leal, Stefan Hamm, John H Eldridge, Robert B Tesh, David K Clarke, Scott C Weaver
: The demonstrated clinical efficacy of a recombinant vesicular stomatitis virus (rVSV) vaccine vector has stimulated the investigation of additional serologically distinct Vesiculovirus vectors as therapeutic and/or prophylactic vaccine vectors to combat emerging viral diseases. Amongst these viral threats are encephalitic alphaviruses, Venezuelan and eastern equine encephalitic viruses (VEEV, EEEV), which have demonstrated potential for natural disease outbreaks, yet no licensed vaccines are available in the event of an epidemic...
February 1, 2017: Journal of Virology
https://www.readbyqxmd.com/read/28143925/adp-ribosylhydrolase-activity-of-chikungunya-virus-macrodomain-is-critical-for-virus-replication-and-virulence
#10
Robert Lyle McPherson, Rachy Abraham, Easwaran Sreekumar, Shao-En Ong, Shang-Jung Cheng, Victoria K Baxter, Hans A V Kistemaker, Dmitri V Filippov, Diane E Griffin, Anthony K L Leung
Chikungunya virus (CHIKV), an Old World alphavirus, is transmitted to humans by infected mosquitoes and causes acute rash and arthritis, occasionally complicated by neurologic disease and chronic arthritis. One determinant of alphavirus virulence is nonstructural protein 3 (nsP3) that contains a highly conserved MacroD-type macrodomain at the N terminus, but the roles of nsP3 and the macrodomain in virulence have not been defined. Macrodomain is a conserved protein fold found in several plus-strand RNA viruses that binds to the small molecule ADP-ribose...
January 31, 2017: Proceedings of the National Academy of Sciences of the United States of America
https://www.readbyqxmd.com/read/28137799/characterization-of-%C3%AE-d-n4-hydroxycytidine-as-a-novel-inhibitor-of-chikungunya-virus
#11
Maryam Ehteshami, Sijia Tao, Keivan Zandi, Hui-Mien Hsiao, Yong Jiang, Emily Hammond, Franck Amblard, Olivia O Russell, Andres Merits, Raymond F Schinazi
Chikungunya virus (CHIKV) represents a re-emerging global threat to human health. Recent outbreaks across Asia, Europe, Africa and the Caribbean have prompted renewed scientific interest in this mosquito-borne alphavirus. There are currently no vaccines against CHIKV and treatment has been limited to non-specific antiviral agents, with sub-optimal outcomes. Herein, we have identified β-D-N(4)-hydroxycytidine (NHC) as a novel inhibitor of CHIKV. NHC behaves as a pyrimidine ribonucleoside and selectively inhibit CHIKV replication in cell culture...
January 30, 2017: Antimicrobial Agents and Chemotherapy
https://www.readbyqxmd.com/read/28137651/immune-gene-profiles-in-atlantic-salmon-salmo-salar-l-post-smolts-infected-with-sav3-by-bath-challenge-show-a-delayed-response-and-lower-levels-of-gene-transcription-compared-to-injected-fish
#12
L J Moore, J Jarungsriapisit, T O Nilsen, S Stefansson, G L Taranger, C J Secombes, H C Morton, S Patel
Salmonid alphavirus (SAV) causes pancreatic disease (PD) in salmonids in Northern Europe which results in large economic losses within the aquaculture industry. In order to better understand the underlying immune mechanisms during a SAV3 infection Atlantic salmon post-smolts were infected by either i.m.-injection or bath immersion and their immune responses compared. Analysis of viral loads showed that by 14 dpi i.m.-injected and bath immersion groups had 95.6% and 100% prevalence respectively and that both groups had developed the severe pathology typical of PD...
January 28, 2017: Fish & Shellfish Immunology
https://www.readbyqxmd.com/read/28129638/neurotropic-alphaviruses-can-propagate-without-capsid
#13
EDITORIAL
Marta Ruiz-Guillen, Nicola G A Abrescia, Cristian Smerdou
No abstract text is available yet for this article.
16, 2016: Oncotarget
https://www.readbyqxmd.com/read/28114368/identification-of-functional-determinants-in-the-chikungunya-virus-e2-protein
#14
Christopher Weber, Eva Berberich, Christine von Rhein, Lisa Henß, Eberhard Hildt, Barbara S Schnierle
BACKGROUND: Chikungunya virus (CHIKV) is a mosquito-transmitted alphavirus that causes high fever, rash, and recurrent arthritis in humans. It has efficiently adapted to Aedes albopictus, which also inhabits temperate regions, including Europe and the United States of America. In the past, CHIKV has mainly affected developing countries, but has recently caused large outbreaks in the Caribbean and Latin America. No treatment or licensed CHIKV vaccine exists. METHODOLOGY/PRINCIPAL FINDINGS: Here, we have identified determinants in the CHIKV cell-attachment protein E2 that facilitate cell binding...
January 2017: PLoS Neglected Tropical Diseases
https://www.readbyqxmd.com/read/28104453/alphavirus-polymerase-and-rna-replication
#15
REVIEW
Maija K Pietilä, Kirsi Hellström, Tero Ahola
Alphaviruses are typically arthropod-borne, and many are important pathogens such as chikungunya virus. Alphaviruses encode four nonstructural proteins (nsP1-4), initially produced as a polyprotein P1234. nsP4 is the core RNA-dependent RNA polymerase but all four nsPs are required for RNA synthesis. The early replication complex (RC) formed by the polyprotein P123 and nsP4 synthesizes minus RNA strands, and the late RC composed of fully processed nsP1-nsP4 is responsible for the production of genomic and subgenomic plus strands...
January 16, 2017: Virus Research
https://www.readbyqxmd.com/read/28092259/-first-case-of-chikungunya-fever-in-hermosillo-sonora-mexico
#16
Miguel Ángel Martínez-Medina, Ismael Antonio Cañedo-Dorame
The Chikungunya is an arbovirus first described during a 1952 outbreak of febrile exantematic disease in southern Tanganyika (now Tanzania). It is a virus within the alphavirus genus of the Togaviridae family, it is usually transmitted to humans by Aedes mosquitoes. Typically, the disease manifests as acute onset of fever and joint pains. This study describes the clinical characteristics the first imported case infected with chikungunya fever (CHIK) in Hermosillo, Sonora, Mexico. We report the case of a 30 years old man seen in our emergency department due to fever, polyarthralgia, rash and headache...
January 2017: Revista Médica del Instituto Mexicano del Seguro Social
https://www.readbyqxmd.com/read/28075229/altered-mitochondrial-dynamics-as-a-consequence-of-venezuelan-equine-encephalitis-virus-infection
#17
Forrest Keck, Taryn Brooks-Faulconer, Tyler Lark, Pavitra Ravishankar, Charles Bailey, Carolina Salvador-Morales, Aarthi Narayanan
Mitochondria are sentinel organelles that are impacted by various forms of cellular stress, including viral infections. While signaling events associated with mitochondria, including those activated by pathogen associated molecular patterns (PAMPs), are widely studied, alterations in mitochondrial distribution and changes in mitochondrial dynamics are also beginning to be associated with cellular insult. Cells of neuronal origin have been demonstrated to display remarkable alterations in several instances, including neurodegenerative disorders...
January 11, 2017: Virulence
https://www.readbyqxmd.com/read/28060952/trim25-enhances-the-antiviral-action-of-zinc-finger-antiviral-protein-zap
#18
Melody M H Li, Zerlina Lau, Pamela Cheung, Eduardo G Aguilar, William M Schneider, Leonia Bozzacco, Henrik Molina, Eugen Buehler, Akinori Takaoka, Charles M Rice, Dan P Felsenfeld, Margaret R MacDonald
The host factor and interferon (IFN)-stimulated gene (ISG) product, zinc-finger antiviral protein (ZAP), inhibits a number of diverse viruses by usurping and intersecting with multiple cellular pathways. To elucidate its antiviral mechanism, we perform a loss-of-function genome-wide RNAi screen to identify cellular cofactors required for ZAP antiviral activity against the prototype alphavirus, Sindbis virus (SINV). In order to exclude off-target effects, we carry out stringent confirmatory assays to verify the top hits...
January 2017: PLoS Pathogens
https://www.readbyqxmd.com/read/28030537/molecular-virologic-and-clinical-characteristics-of-a-chikungunya-fever-outbreak-in-la-romana-dominican-republic-2014
#19
Rose M Langsjoen, Rebecca J Rubinstein, Tiffany F Kautz, Albert J Auguste, Jesse H Erasmus, Liddy Kiaty-Figueroa, Renessa Gerhardt, David Lin, Kumar L Hari, Ravi Jain, Nicolas Ruiz, Antonio E Muruato, Jael Silfa, Franklin Bido, Matthew Dacso, Scott C Weaver
Since emerging in Saint Martin in 2013, chikungunya virus (CHIKV), an alphavirus transmitted by the Aedes aegypti mosquito, has infected approximately two million individuals in the Americas, with over 500,000 reported cases in the Dominican Republic (DR). CHIKV-infected patients typically present with a febrile syndrome including polyarthritis/polyarthralgia, and a macropapular rash, similar to those infected with dengue and Zika viruses, and malaria. Nevertheless, many Dominican cases are unconfirmed due to the unavailability and high cost of laboratory testing and the absence of specific treatment for CHIKV infection...
December 2016: PLoS Neglected Tropical Diseases
https://www.readbyqxmd.com/read/28005523/discovery-of-a-novel-alphavirus-related-to-eilat-virus
#20
Kyra Hermanns, Florian Zirkel, Anne Kopp, Marco Marklewitz, Innocent Rwego, Alejandro Estrada, Thomas Robert Gillespie, Christian Drosten, Sandra Junglen
Most alphaviruses are transmitted by arthropods and infect vertebrate hosts. An exception is Eilat virus (EILV), the only described alphavirus with a host range restricted to insects. We established a new generic reverse transcription PCR assay for alphaviruses and tested 8,860 tropical mosquitoes. We detected a novel alphavirus, tentatively named Taï Forest alphavirus (TALV), in Culex decens mosquitoes collected in Côte d'Ivoire. The full genome was sequenced and closest similarity was found to EILV. Pairwise amino acid identities to EILV ranged between 67-88% for the corresponding proteins suggesting that TALV defines a proposed new alphavirus species...
December 21, 2016: Journal of General Virology
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