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https://www.readbyqxmd.com/read/27918577/control-of-aedes-aegypti-breeding-a-novel-intervention-for-prevention-and-control-of-dengue-in-an-endemic-zone-of-delhi-india
#1
B N Nagpal, Sanjeev Kumar Gupta, Arshad Shamim, Kumar Vikram, Aruna Srivastava, N R Tuli, Rekha Saxena, Himmat Singh, V P Singh, V N Bhagat, N K Yadav, Neena Valecha
BACKGROUND AND OBJECTIVE: The study is based on hypothesis that whether continuous entomological surveillance of Ae. aegypti and simultaneous appropriate interventions in key containers during non-transmission (December-May) months would have any impact on breeding of Aedes and dengue cases during the following transmission months (June-November). The impact of the surveillance and intervention measures undertaken during non-transmission months were assessed by entomological indicators namely container index (CI), house index (HI), pupal index (PI) and breteau index (BI)...
2016: PloS One
https://www.readbyqxmd.com/read/27918527/induction-and-suppression-of-antiviral-rna-interference-by-influenza-a-virus-in-mammalian-cells
#2
Yang Li, Megha Basavappa, Jinfeng Lu, Shuwei Dong, D Alexander Cronkite, John T Prior, Hans-Christian Reinecker, Paul Hertzog, Yanhong Han, Wan-Xiang Li, Sihem Cheloufi, Fedor V Karginov, Shou-Wei Ding, Kate L Jeffrey
Influenza A virus (IAV) causes annual epidemics and occasional pandemics, and is one of the best-characterized human RNA viral pathogens(1). However, a physiologically relevant role for the RNA interference (RNAi) suppressor activity of the IAV non-structural protein 1 (NS1), reported over a decade ago(2), remains unknown(3). Plant and insect viruses have evolved diverse virulence proteins to suppress RNAi as their hosts produce virus-derived small interfering RNAs (siRNAs) that direct specific antiviral defence(4-7) by an RNAi mechanism dependent on the slicing activity of Argonaute proteins (AGOs)(8,9)...
December 5, 2016: Nature Microbiology
https://www.readbyqxmd.com/read/27914808/influenza-a-virus-ns1-protein-induced-a20-contributes-to-viral-replication-by-suppressing-interferon-induced-antiviral-response
#3
Wenjing Feng, Xiaoning Sun, Ning Shi, Maolin Zhang, Zhenhong Guan, Ming Duan
The innate immune response provides the first line of defense against viruses and other pathogens by responding to specific microbial molecules. A20 is a cytoplasmic ubiquitin-editing protein that negatively regulates the retinoic acid-inducible gene I (RIG-I)-mediated activation of interferon regulatory factors (IRF) 3. Here, we found that influenza A virus (IAV) non-structural protein (NS) 1 dramatically induced the protein level of A20 in A549 cells whose expression levels were positively associated with the viral virulence...
December 1, 2016: Biochemical and Biophysical Research Communications
https://www.readbyqxmd.com/read/27902362/identification-and-interspecies-transmission-of-a-novel-bocaparvovirus-among-different-bat-species-in-china
#4
Susanna Kp Lau, Syed Shakeel Ahmed, Hazel C Yeung, Kenneth S M Li, Rachel Y Y Fan, Toni Y C Cheng, Jian-Piao Cai, Ming Wang, Bo-Jian Zheng, Samson S Y Wong, Patrick C Y Woo, Kwok-Yung Yuen
We report the discovery of a novel bocaparvovirus, bat bocaparvovirus (BtBoV), in one spleen, four respiratory and 61 alimentary samples from bats of six different species belonging to three families, Hipposideridae, Rhinolophidae and Vespertilionidae. BtBoV showed higher detection rate in alimentary samples of Rhinolophus sinicus (5.7%) than those of other bat species (0.43-1.59%), supporting R. sinicus as the primary reservoir and virus spill-over to accidental bat species. BtBoV peaked during lactating season of R...
October 25, 2016: Journal of General Virology
https://www.readbyqxmd.com/read/27902334/the-ns1-protein-of-avian-influenza-virus-h9n2-induces-oxidative-stress-mediated-chicken-oviduct-epithelial-cells-coecs-apoptosis
#5
Xuefeng Qi, Huizhu Zhang, Qiuzhen Wang, Jingyu Wang
The pathogenesis of H9N2 subtype avian influenza virus infection (AIV) in the hens is often related to the oviduct tissue damage. The viral nonstructural NS1 protein is thought to play key role in regulating the pathogenicity of AIV, but the exact function to this process remains elusive. In this study, the pro-apoptosis effect of H9N2 NS1 protein was examined on chicken oviduct epithelial cells (COECs) and our data suggested that NS1 induced oxidative stress was a contributing factor for apoptosis. Our data suggest that NS1 protein level was correlated with reactive oxygen species (ROS) in COECs cells transfected with NS1 expression plasmids...
October 20, 2016: Journal of General Virology
https://www.readbyqxmd.com/read/27894268/differentiating-secondary-from-primary-dengue-using-igg-to-igm-ratio-in-early-dengue-an-observational-hospital-based-clinico-serological-study-from-north-india
#6
Khalid Hamid Changal, Ab Hameed Raina, Adnan Raina, Manzoor Raina, Rehana Bashir, Muzamil Latief, Tanveer Mir, Qayum Hamid Changal
BACKGROUND: Secondary dengue causes more severe disease than the primary. Early on, it is important to differentiate the two. We tried to find important clinical and laboratory differences between the two for the purpose of early differentiation. METHODS: One hundred fourteen patients confirmed on reverse transcriptase-polymerase chain reaction (RT PCR) were studied. On day 2 of illness IgM and IgG indices were studied for calculation of IgG/IgM ratio. A one-step immunochromatographic assay was used for classification of patients into primary and secondary dengue...
November 28, 2016: BMC Infectious Diseases
https://www.readbyqxmd.com/read/27890363/comparative-genome-analysis-between-southeast-asian-and-south-american-zika-viruses
#7
Theerarat Kochakarn, Namfon Kotanan, Krittikorn Kümpornsin, Duangkamon Loesbanluechai, Monta Thammasatta, Prasert Auewarakul, Prapon Wilairat, Thanat Chookajorn
OBJECTIVE: To understand the cause for the differences between potentially mild Southeast Asian and the more pathogenic ZIKV in South America. METHODS: A comparative genomic analysis was performed to determine putative causations stemming from ZIKV. RESULTS: Phylogenetic analyses integrating geographical and time factors revealed that Southeast Asian ZIKV might not be the direct source of South American outbreaks as previously speculated. Amino acid residues unique to South American ZIKV isolates at the envelope, pr and NS1 proteins are listed and shown in the structural context...
November 2016: Asian Pacific Journal of Tropical Medicine
https://www.readbyqxmd.com/read/27884655/zika-virus-infection-in-dexamethasone-immunosuppressed-mice-demonstrating-disseminated-infection-with-multi-organ-involvement-including-orchitis-effectively-treated-by-recombinant-type-i-interferons
#8
Jasper Fuk-Woo Chan, Anna Jinxia Zhang, Chris Chung-Sing Chan, Cyril Chik-Yan Yip, Winger Wing-Nga Mak, Houshun Zhu, Vincent Kwok-Man Poon, Kah-Meng Tee, Zheng Zhu, Jian-Piao Cai, Jessica Oi-Ling Tsang, Kenn Ka-Heng Chik, Feifei Yin, Kwok-Hung Chan, Kin-Hang Kok, Dong-Yan Jin, Rex Kwok-Him Au-Yeung, Kwok-Yung Yuen
BACKGROUND: Disseminated or fatal Zika virus (ZIKV) infections were reported in immunosuppressed patients. Existing interferon-signaling/receptor-deficient mouse models may not be suitable for evaluating treatment effects of recombinant interferons. METHODS: We developed a novel mouse model for ZIKV infection by immunosuppressing BALB/c mice with dexamethasone. RESULTS: Dexamethasone-immunosuppressed male mice (6-8weeks) developed disseminated infection as evidenced by the detection of ZIKV-NS1 protein expression and high viral loads in multiple organs...
November 12, 2016: EBioMedicine
https://www.readbyqxmd.com/read/27881651/alternative-polyadenylation-of-human-bocavirus-at-its-3-end-is-regulated-by-multiple-elements-and-affects-capsid-expression
#9
Sujuan Hao, Junmei Zhang, Zhen Chen, Huanzhou Xu, Hanzhong Wang, Wuxiang Guan
: Alternative processing of human bocavirus (HBoV) P5 promoter-transcribed RNA is critical for generating the structural and nonstructural protein-encoding mRNA transcripts. The regulatory mechanism by which HBoV RNA transcripts are polyadenylated at proximal [(pA)p] or distal [(pA)d] polyadenylation sites is yet unclear. We constructed a recombinant HBoV infectious clone to study the alternative polyadenylation regulation of HBoV. Surprisingly, in addition to the reported distal polyadenylation site (pA)d, a novel distal polyadenylation site (pA)d2 which is located in the right end hairpin (REH), was identified during infectious clone transfection or recombinant virus infection...
November 23, 2016: Journal of Virology
https://www.readbyqxmd.com/read/27876044/generation-of-monoclonal-antibodies-against-native-viral-proteins-using-antigen-expressing-mammalian-cells-for-mouse-immunization
#10
Natalie Rose, Carlos Augusto Pinho-Nascimento, Alessia Ruggieri, Paola Favuzza, Marco Tamborrini, Hanna Roth, Marcia Terezinha Baroni de Moraes, Hugues Matile, Thomas Jänisch, Gerd Pluschke, Katharina Röltgen
BACKGROUND: Due to their rising incidence and progressive geographical spread, infections with mosquito-borne viruses, such as dengue (DENV), chikungunya and zika virus, have developed into major public health challenges. Since all of these viruses may cause similar symptoms and can occur in concurrent epidemics, tools for their differential diagnosis and epidemiological monitoring are of urgent need. RESULTS: Here we report the application of a novel strategy to rapidly generate monoclonal antibodies (mAbs) against native viral antigens, exemplified for the DENV nonstructural glycoprotein 1 (NS1)...
November 22, 2016: BMC Biotechnology
https://www.readbyqxmd.com/read/27875810/nonstructural-protein-1-of-tick-borne-encephalitis-virus-induces-oxidative-stress-and-activates-antioxidant-defense-by-the-nrf2-are-pathway
#11
Yulia V Kuzmenko, Olga A Smirnova, Alexander V Ivanov, Elizaveta S Starodubova, Vadim L Karpov
BACKGROUND: Infection with tick-borne encephalitis virus (TBEV) causes pathological changes in the central nervous system. However, the possible redox alterations in the infected cells that can contribute to the virus pathogenicity remain unknown. OBJECTIVE: In the current study we explored the ability of TBEV nonstructural protein 1 (NS1) to induce oxidative stress and activate antioxidant defense via the nuclear factor (erythroid-derived-2)-like 2/antioxidant response element (Nrf2/ARE) pathway...
November 23, 2016: Intervirology
https://www.readbyqxmd.com/read/27871815/identification-and-genomic-characterization-of-a-novel-rat-bocavirus-from-brown-rats-in-china
#12
Susanna K P Lau, Hazel C Yeung, Kenneth S M Li, Carol S F Lam, Jian-Piao Cai, Ming-Chi Yuen, Ming Wang, Bo-Jian Zheng, Patrick C Y Woo, Kwok-Yung Yuen
Despite recent discoveries of novel animal bocaparvoviruses, current understandings on the diversity and evolution of bocaparvoviruses are still limited. We report the identification and genome characterization of a novel bocaparvovirus, rat bocaparvovirus (RBoV), in brown rats (Rattus norvegicus) in China. RBoV was detected in 11.5%, 2.4%, 16.2% and 0.3% of alimentary, respiratory, spleen and kidney samples respectively, of 636 brown rats by PCR, but not in samples of other rodent species, suggesting that brown rats are the primary reservoir of RBoV...
November 19, 2016: Infection, Genetics and Evolution
https://www.readbyqxmd.com/read/27869202/suppression-of-rac1-signaling-by-influenza-a-virus-ns1-facilitates-viral-replication
#13
Wei Jiang, Chunjie Sheng, Xiuling Gu, Dong Liu, Chen Yao, Shijuan Gao, Shuai Chen, Yinghui Huang, Wenlin Huang, Min Fang
Influenza A virus (IAV) is a major human pathogen with the potential to become pandemic. IAV contains only eight RNA segments; thus, the virus must fully exploit the host cellular machinery to facilitate its own replication. In an effort to comprehensively characterize the host machinery taken over by IAV in mammalian cells, we generated stable A549 cell lines with over-expression of the viral non-structural protein (NS1) to investigate the potential host factors that might be modulated by the NS1 protein. We found that the viral NS1 protein directly interacted with cellular Rac1 and facilitated viral replication...
November 21, 2016: Scientific Reports
https://www.readbyqxmd.com/read/27867373/two-genetically-similar-h9n2-influenza-a-viruses-show-different-pathogenicity-in-mice
#14
Qingtao Liu, Yuzhuo Liu, Jing Yang, Xinmei Huang, Kaikai Han, Dongmin Zhao, Keran Bi, Yin Li
H9N2 Avian influenza virus has repeatedly infected humans and other mammals, which highlights the need to determine the pathogenicity and the corresponding mechanism of this virus for mammals. In this study, we found two H9N2 viruses with similar genetic background but with different pathogenicity in mice. The A/duck/Nanjing/06/2003 (NJ06) virus was highly pathogenic for mice, with a 50% mouse lethal dose (MLD50) of 10(2.83) 50% egg infectious dose (EID50), whereas the A/duck/Nanjing/01/1999 (NJ01) virus was low pathogenic for mice, with a MLD50 of >10(6...
2016: Frontiers in Microbiology
https://www.readbyqxmd.com/read/27860556/immunopathogenesis-of-dengue-virus-induced-redundant-cell-death-apoptosis-and-pyroptosis
#15
San Suwanmanee, Natthanej Luplertlop
Dengue virus infection is a self-limited condition, which is of particular importance in tropical and subtropical regions and for which no specific treatment or effective vaccine is available. There are several hypotheses explaining dengue pathogenesis. These usually refer to host immune responses, including antibody-dependent enhancement, cytokine expression, and dengue virus particles including NS1 protein, which lead to cell death by both apoptosis and pyroptosis. A clear understanding of the pathogenesis should facilitate the development of vaccines and therapies...
November 18, 2016: Viral Immunology
https://www.readbyqxmd.com/read/27860276/regulation-of-kynurenine-biosynthesis-during-influenza-virus-infection
#16
Lana Gaelings, Sandra Söderholm, Andrii Bugai, Yu Fu, Jatin Nandania, Bert Schepens, Martina B Lorey, Janne Tynell, Liesbeth Vande Ginste, Ronan Le Goffic, Matthew S Miller, Marika Kuisma, Varpu Marjomäki, Jef De Brabander, Sampsa Matikainen, Tuula A Nyman, Dennis Bamford, Xavier Saelens, Ilkka Julkunen, Henrik Paavilainen, Veijo Hukkanen, Vidya Velagapudi, Denis E Kainov
Influenza A viruses (IAVs) remain serious threats to public health because of the shortage of effective means of control. Developing more effective virus control modalities requires better understanding of virus-host interactions. It has previously been shown that IAV induces the production of kynurenine, which suppresses T-cell responses, enhances pain hypersensitivity and disturbs behaviour in infected animals. However, the regulation of kynurenine biosynthesis during IAV infection remains elusive. Here we showed that IAV infection induced expression of interferons (IFNs), which upregulated production of indoleamine-2,3-dioxygenase (IDO1), which catalysed the kynurenine biosynthesis...
November 18, 2016: FEBS Journal
https://www.readbyqxmd.com/read/27846859/attenuation-of-the-virulence-of-a-recombinant-influenza-virus-expressing-the-naturally-truncated-ns-gene-from-an-h3n8-equine-influenza-virus-in-mice
#17
Woonsung Na, Kwang-Soo Lyoo, Sun-Woo Yoon, Minjoo Yeom, Bokyu Kang, Hyoungjoon Moon, Hye Kwon Kim, Dae Gwin Jeong, Jeong-Ki Kim, Daesub Song
Equine influenza virus (EIV) causes a highly contagious disease in horses and other equids. Recently, we isolated an H3N8 EIV (A/equine/Kyonggi/SA1/2011) from a domestic horse in South Korea that exhibited symptoms of respiratory disease, and found that the EIV strain contained a naturally mutated NS gene segment encoding a truncated NS1 protein. In order to determine whether there was an association between the NS gene truncation and viral virulence, a reverse genetics system was applied to generate various NS gene recombinant viruses using the backbone of the H1N1 A/Puerto Rico/8/1934 (PR/8) virus...
November 15, 2016: Veterinary Research
https://www.readbyqxmd.com/read/27826075/the-effect-of-the-dengue-non-structural-1-protein-expression-over-the-hepg2-cell-proteins-in-a-proteomic-approach
#18
Kíssila Rabelo, Monique R O Trugilho, Simone M Costa, Bernardo A S Pereira, Otacílio C Moreira, André T S Ferreira, Paulo C Carvalho, Jonas Perales, Ada M B Alves
: Dengue is an important mosquito borne viral disease in the world. Dengue virus (DENV) encodes a polyprotein, which is cleaved in ten proteins, including the non-structural protein 1 (NS1). In this work, we analyzed the effect of NS1 expression in one hepatic cell line, HepG2, through a shotgun proteomic approach. Cells were transfected with pcENS1 plasmid, which encodes the DENV2 NS1 protein, or the controls pcDNA3 (negative control) and pMAXGFP (GFP, a protein unrelated to dengue)...
November 5, 2016: Journal of Proteomics
https://www.readbyqxmd.com/read/27821666/duck-tembusu-virus-nonstructural-protein-1-antagonizes-ifn-%C3%AE-signaling-pathways-by-targeting-visa
#19
Junyong Wang, Cao-Qi Lei, Yanhong Ji, Hongbo Zhou, Yujie Ren, Qianqian Peng, Yan Zeng, Yane Jia, Jinying Ge, Bo Zhong, Yu Li, Jianzhong Wei, Hong-Bing Shu, Qiyun Zhu
Duck Tembusu virus (DTMUV) is an emergent infectious pathogen that has caused severe disease in ducks and huge economic losses to the poultry industry in China since 2009. Previously, we showed that DTMUV inhibits IFN-β induction early in infection; however, the mechanisms of the inhibition of innate immune responses remain poorly understood. In this study, we screened DTMUV-encoded structural and nonstructural proteins using reporter assays and found that DTMUV NS1 markedly suppressed virus-triggered IFN-β expression by inhibiting retinoic acid-inducible gene I-like receptor signaling...
December 15, 2016: Journal of Immunology: Official Journal of the American Association of Immunologists
https://www.readbyqxmd.com/read/27820802/inhibition-of-ras-function-through-targeting-an-allosteric-regulatory-site
#20
Russell Spencer-Smith, Akiko Koide, Yong Zhou, Raphael R Eguchi, Fern Sha, Priyanka Gajwani, Dianicha Santana, Ankit Gupta, Miranda Jacobs, Erika Herrero-Garcia, Jacqueline Cobbert, Hugo Lavoie, Matthew Smith, Thanashan Rajakulendran, Evan Dowdell, Mustafa Nazir Okur, Irina Dementieva, Frank Sicheri, Marc Therrien, John F Hancock, Mitsuhiko Ikura, Shohei Koide, John P O'Bryan
RAS GTPases are important mediators of oncogenesis in humans. However, pharmacological inhibition of RAS has proved challenging. Here we describe a functionally critical region, located outside the effector lobe of RAS, that can be targeted for inhibition. We developed NS1, a synthetic binding protein (monobody) that bound with high affinity to both GTP- and GDP-bound states of H-RAS and K-RAS but not N-RAS. NS1 potently inhibited growth factor signaling and oncogenic H-RAS- and K-RAS-mediated signaling and transformation but did not block oncogenic N-RAS, BRAF or MEK1...
November 7, 2016: Nature Chemical Biology
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