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Respiratory syncytial virus

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https://www.readbyqxmd.com/read/29244796/rsv-bronchiolitis-versus-rhinovirus-difference-in-nasal-airway-microrna-profiles-and-nf%C3%AE%C2%BAb-signaling
#1
Kohei Hasegawa, Marcos Pérez-Losada, Claire E Hoptay, Samuel Epstein, Jonathan M Mansbach, Stephen J Teach, Pedro A Piedra, Carlos A Camargo, Robert J Freishtat
BACKGROUND: Although rhinovirus infection is associated with increased risks of acute and chronic respiratory outcomes during childhood compared with respiratory syncytial virus (RSV), the underlying mechanisms remain unclear. We aimed to determine differences in nasal airway microRNA profiles and their downstream effects between infants with rhinovirus and RSV bronchiolitis. METHODS: As part of multicenter cohort study of infants hospitalized for bronchiolitis, we examined nasal samples obtained from 16 infants with rhinovirus and 16 infants with RSV...
December 15, 2017: Pediatric Research
https://www.readbyqxmd.com/read/29243369/burden-of-influenza-respiratory-syncytial-virus-and-other-respiratory-viruses-and-the-completeness-of-respiratory-viral-identification-among-respiratory-inpatients-canada-2003-2014
#2
Dena L Schanzer, Myriam Saboui, Liza Lee, Andrea Nwosu, Christina Bancej
BACKGROUND: A regression-based study design has commonly been used to estimate the influenza burden; however, these estimates are not timely and many countries lack sufficient virological data. Alternative approaches that would permit a timelier assessment of the burden, including a sentinel surveillance approach recommended by the World Health Organization (WHO), have been proposed. We aimed to estimate the hospitalization burden attributable to influenza, respiratory syncytial virus (RSV), and other respiratory viruses (ORV) and to assess both the completeness of viral identification among respiratory inpatients in Canada and the implications of adopting other approaches...
December 15, 2017: Influenza and Other Respiratory Viruses
https://www.readbyqxmd.com/read/29238000/elevation-of-serum-acid-sphingomyelinase-activity-in-children-with-acute-respiratory-syncytial-virus-bronchiolitis
#3
Shuichiro Yoshida, Atsuko Noguchi, Wataru Kikuchi, Hiroshi Fukaya, Kiyoshi Igarashi, Tsutomu Takahashi
Acid sphingomyelinase (ASM) is a lysosomal enzyme that hydrolyzes sphingomyelin into ceramide, a bioactive lipid to regulate cellular physiological functions. Thus, ASM activation has been reported as a key event in pathophysiological reactions including inflammation, cytokine release, oxidative stress, and endothelial damage in human diseases. Since ASM activation is associated with extracellular ASM secretion through unknown mechanisms, it can be detected by recognizing the elevation of secretory ASM (S-ASM) activity...
2017: Tohoku Journal of Experimental Medicine
https://www.readbyqxmd.com/read/29237419/performance-of-the-alere-i-rsv-assay-for-point-of-care-detection-of-respiratory-syncytial-virus-in-children
#4
Sarah Valerie Schnee, Johannes Pfeil, Clara Marlene Ihling, Julia Tabatabai, Paul Schnitzler
BACKGROUND: Respiratory syncytial virus (RSV) is the most important cause of severe acute respiratory tract infection in young children. Alere i RSV is a novel molecular rapid test which identifies respiratory syncytial virus in less than 13 min. METHODS: We evaluated the clinical performance of the Alere i RSV assay in a pediatric point-of-care setting during winter season 2016 / 2017. Test results from 518 nasopharyngeal swab samples were compared to a real-time reverse transcription PCR reference standard...
December 13, 2017: BMC Infectious Diseases
https://www.readbyqxmd.com/read/29235261/interferon-%C3%AE-2-and-interferon-%C3%AE-induce-the-degranulation-independent-production-of-vegf-a-and-il-1-receptor-antagonist-and-other-mediators-from-human-mast-cells
#5
Sharon A Oldford, Suzanne P Salsman, Liliana Portales-Cervantes, Raidan Alyazidi, Robert Anderson, Ian D Haidl, Jean S Marshall
BACKGROUND: Mast cells are resident immune effector cells, often studied in the context of allergic disease. Found in substantial numbers at sites of potential infection they are increased at sites of angiogenesis and can be pivotal for the sensing and clearance of a variety of pathogens. Interferons (IFNs) are cytokines that are critical for host defence against intracellular pathogens. Increased levels of IFNs are observed during viral infection and in autoimmune diseases. IFNs are also widely used therapeutically and have been examined in the therapy of severe asthma...
December 13, 2017: Immunity, Inflammation and Disease
https://www.readbyqxmd.com/read/29234123/dusp1-regulates-apoptosis-and-cell-migration-but-not-the-jip1-protected-cytokine-response-during-respiratory-syncytial-virus-and-sendai-virus-infection
#6
Alexa C Robitaille, Elise Caron, Nicolas Zucchini, Espérance Mukawera, Damien Adam, Mélissa K Mariani, Anaïs Gélinas, Audray Fortin, Emmanuelle Brochiero, Nathalie Grandvaux
The host antiviral response involves the induction of interferons and proinflammatory cytokines, but also the activation of cell death pathways, including apoptosis, to limit viral replication and spreading. This host defense is strictly regulated to eliminate the infection while limiting tissue damage that is associated with virus pathogenesis. Post-translational modifications, most notably phosphorylation, are key regulators of the antiviral defense implying an important role of protein phosphatases. Here, we investigated the role of the dual-specificity phosphatase 1 (DUSP1) in the host defense against human respiratory syncytial virus (RSV), a pathogenic virus of the Pneumoviridae family, and Sendai virus (SeV), a model virus being developed as a vector for anti-RSV vaccine...
December 12, 2017: Scientific Reports
https://www.readbyqxmd.com/read/29232863/a-two-dimensional-human-minilung-system-model-for-respiratory-syncytial-virus-infections
#7
Esmeralda Magro-Lopez, Trinidad Guijarro, Isidoro Martinez, Maria Martin-Vicente, Isabel Liste, Alberto Zambrano
Human respiratory syncytial virus (HRSV) is a major cause of serious pediatric respiratory diseases that lacks effective vaccine or specific therapeutics. Although our understanding about HRSV biology has dramatically increased during the last decades, the need for adequate models of HRSV infection is compelling. We have generated a two-dimensional minilung from human embryonic stem cells (hESCs). The differentiation protocol yielded at least six types of lung and airway cells, although it is biased toward the generation of distal cells...
December 10, 2017: Viruses
https://www.readbyqxmd.com/read/29231134/plant-made-antibodies-properties-and-therapeutic-applications
#8
Tatianamsu Ru V Komarova, Ekaterina V Sheshukova, Yuri L Dorokhov
A cost-effective plant platform for therapeutic monoclonal antibody production is both flexible and scalable. In addition, plant-made antibodies (PMAbs) could be advantageous compared to those produced in animal cells due to the absence of a risk of contamination from nucleic acids or proteins of animal origin. In this review, the various platforms of PMAbs production are described, and the widely used transient expression system based on Agrobacterium-mediated delivery of genetic material into plant cells is discussed in detail...
December 11, 2017: Current Medicinal Chemistry
https://www.readbyqxmd.com/read/29230219/functional-impairment-of-mononuclear-phagocyte-system-by-the-human-respiratory-syncytial-virus
#9
REVIEW
Karen Bohmwald, Janyra A Espinoza, Raúl A Pulgar, Evelyn L Jara, Alexis M Kalergis
The mononuclear phagocyte system (MPS) comprises of monocytes, macrophages (MΦ), and dendritic cells (DCs). MPS is part of the first line of immune defense against a wide range of pathogens, including viruses, such as the human respiratory syncytial virus (hRSV). The hRSV is an enveloped virus that belongs to the Pneumoviridae family, Orthopneumovirus genus. This virus is the main etiological agent causing severe acute lower respiratory tract infection, especially in infants, children and the elderly. Human RSV can cause bronchiolitis and pneumonia and it has also been implicated in the development of recurrent wheezing and asthma...
2017: Frontiers in Immunology
https://www.readbyqxmd.com/read/29228581/a-multiplex-liquid-chip-assay-based-on-luminex-xmap-technology-for-simultaneous-detection-of-six-common-respiratory-viruses
#10
Yong Yan, Jian-Yong Luo, Yin Chen, Heng-Hui Wang, Guo-Ying Zhu, Pei-Yan He, Jin-Lei Guo, Yong-Liang Lei, Zhong-Wen Chen
We utilized one-step multiplex reverse transcription-PCR (RT-PCR) and Luminex xMAP technology to develop a respiratory multiplex liquid-chip assay (rMLA) for simultaneous detection of 6 common respiratory viruses, including influenza virus type A (FluA) and type B (FluB), para-influenza virus type 3 (PIV-3), respiratory syncytial virus (RSV), human metapneumovirus (MPV) and a threatening virus to China, Middle East Respiratory Syndrome coronavirus (MERS-CoV). Performance of rMLA was evaluated by comparing with real-time RT-PCR...
November 14, 2017: Oncotarget
https://www.readbyqxmd.com/read/29228557/peripheral-blood-micrornas-expression-is-associated-with-infant-respiratory-syncytial-virus-infection
#11
Shouyi Wang, Pin Liu, Pu Yang, Junwen Zheng, Dongchi Zhao
MicroRNAs respond to the inflammatory responses induced by RNA virus infection. In this study, we investigated the specific microRNA profile in the peripheral blood of infants infected with respiratory syncytial virus (RSV). Blood specimens were analyzed using microRNA microarrays, followed by quantitative RT-PCR. A specific microRNA profile in the peripheral blood of RSV-infected infants was identified for the first time. MiR-106b-5p, miR-20b-5p, and miR-342-3p were upregulated, while miR-320e, miR-320d, miR-877-5p, miR-122-5p, and miR-92b-5p were downregulated...
November 14, 2017: Oncotarget
https://www.readbyqxmd.com/read/29227860/respiratory-syncytial-virus-in-brazilian-infants-ten-years-two-cohorts
#12
Elinara Wollmeister, Alfonso Eduardo Alvarez, Juliana Cristina Santiago Bastos, Fernando Augusto Lima Marson, José Dirceu Ribeiro, Emílio Carlos Elias Baracat, Clarice Weis Arns, Adriana Gut Lopes Riccetto
BACKGROUND: Each year, a considerable amount of children will experience at least one episode of acute viral bronchiolitis (AVB) during their first year of life. About 10% of them will be hospitalized, with significant physical and economic burdens. OBJECTIVES: To compare two cohorts of infants with AVB, from same region, in a ten-year interval, regarding epidemiologic factors and viral etiology. STUDY DESIGN: Cohorts: 142 (2004) and 172 (2014) infants at ages zero to 12 months; clinical diagnosis of AVB; medical care in hospital and genetic screening of nasopharyngeal secretion for respiratory viruses...
December 6, 2017: Journal of Clinical Virology: the Official Publication of the Pan American Society for Clinical Virology
https://www.readbyqxmd.com/read/29226974/acute-bronchiolitis-influence-of-viral-co-infection-in-infants-hospitalized-over-12-consecutive-epidemic-seasons
#13
Laura Petrarca, Raffaella Nenna, Antonella Frassanito, Alessandra Pierangeli, Salvatore Leonardi, Carolina Scagnolari, Guido Antonelli, Paola Papoff, Corrado Moretti, Fabio Midulla
Bronchiolitis is the first lower respiratory tract viral infection manifesting in infants younger than 12 months of age. Our aim was to evaluate clinical and serological differences in infants with bronchiolitis from a single or from multiple viruses. Our secondary aim was to investigate differences in recurrent wheezing episodes after 12-24-36 months of follow-up. We reviewed the clinical records for 486 full-term infants hospitalized for bronchiolitis with at least one virus detected in the nasopharyngeal aspirate...
December 11, 2017: Journal of Medical Virology
https://www.readbyqxmd.com/read/29224300/-etiological-analysis-and-establishment-of-a-discriminant-model-for-lower-respiratory-tract-infections-in-hospitalized-patients
#14
Y S Chen, X H Lin, H R Li, Z D Hua, M Q Lin, W S Huang, T Yu, H Y Lyu, W P Mao, Y Q Liang, X R Peng, S J Chen, H Zheng, S Q Lian, X L Hu, X Q Yao
Objective: To analyze the pathogens of lower respiratory tract infection(LRTI) including bacterial, viral and mixed infection, and to establish a discriminant model based on clinical features in order to predict the pathogens. Methods: A total of 243 hospitalized patients with lower respiratory tract infections were enrolled in Fujian Provincial Hospital from April 2012 to September 2015. The clinical data and airway (sputum and/or bronchoalveolar lavage) samples were collected. Microbes were identified by traditional culture (for bacteria), loop-mediated isothermal amplification(LAMP) and gene sequencing (for bacteria and atypical pathogen), or Real-time quantitative polymerase chain reaction (Real-time PCR)for viruses...
December 12, 2017: Chinese Journal of Tuberculosis and Respiratory Diseases
https://www.readbyqxmd.com/read/29217660/chimeric-pneumoviridae-fusion-proteins-as-immunogens-to-induce-cross-neutralizing-antibody-responses
#15
Eduardo Olmedillas, Olga Cano, Isidoro Martínez, Daniel Luque, María C Terrón, Jason S McLellan, José A Melero, Vicente Más
Human respiratory syncytial virus (hRSV) and human metapneumovirus (hMPV), two members of the Pneumoviridae family, account for the majority of severe lower respiratory tract infections worldwide in very young children. They are also a frequent cause of morbidity and mortality in the elderly and immunocompromised adults. High levels of neutralizing antibodies, mostly directed against the viral fusion (F) glycoprotein, correlate with protection against either hRSV or hMPV However, no cross-neutralization is observed in polyclonal antibody responses raised after virus infection or immunization with purified F proteins...
December 7, 2017: EMBO Molecular Medicine
https://www.readbyqxmd.com/read/29215596/rsv-infection-in-human-macrophages-promotes-cxcl10-ip-10-expression-during-bacterial-co-infection
#16
Daniela Machado, Jonathan Hoffmann, Marie Moroso, Manuel Rosa-Calatrava, Hubert Endtz, Olivier Terrier, Glaucia Paranhos-Baccalà
Respiratory syncytial virus (RSV), a major etiologic agent of acute lower respiratory infection constitutes the most important cause of death in young children worldwide. Viral/bacterial mixed infections are related to severity of respiratory inflammatory diseases, but the underlying mechanisms remain poorly understood. We have previously investigated the intracellular mechanisms that mediate the immune response in the context of influenza virus/Streptococcus pneumoniae (Sp) co-infection using a model of human monocyte-derived macrophages (MDMs)...
December 7, 2017: International Journal of Molecular Sciences
https://www.readbyqxmd.com/read/29213258/the-complexity-of-antibody-responses-elicited-against-the-respiratory-syncytial-virus-glycoproteins-in-hospitalized-children-younger-than-2-years
#17
Alfonsina Trento, Rosa Rodríguez-Fernández, María I González-Sánchez, Felipe González-Martínez, Vicente Mas, Mónica Vázquez, Concepción Palomo, José A Melero
The influence of age and maternal antibodies on the antibody responses to human respiratory syncytial virus (hRSV) glycoproteins in very young children has been a matter of controversy. Both, immaturity of the immune system at very early age and suppression of the host immune response by high level of maternal antibodies have been claimed to limit the host antibody response to virus infection and to jeopardize the use of hRSV vaccines under development in that age group. Hence, the antibody responses to the two major hRSV glycoproteins (F and G) were evaluated in children younger than 2 years, hospitalized with laboratory confirmed hRSV bronchiolitis...
2017: Frontiers in Microbiology
https://www.readbyqxmd.com/read/29212939/the-heptad-repeat-c-domain-of-the-respiratory-syncytial-virus-fusion-protein-plays-a-key-role-in-membrane-fusion
#18
Imogen M Bermingham, Keith J Chappell, Daniel Watterson, Paul R Young
Respiratory syncytial virus (RSV) mediates host cell entry through the fusion (F) protein, which undergoes a conformational change to facilitate the merger of viral and host lipid membrane envelopes. RSV F comprises a trimer of disulfide bonded F1 and F2 subunits that is present on the virion surface in a 'metastable' pre-fusion state. This pre-fusion form is readily triggered to undergo refolding to bring two heptad repeats (HRA and HRB) into close proximity to form a six-helix bundle that stabilizes the post-fusion form and provides the free energy required for membrane fusion...
December 6, 2017: Journal of Virology
https://www.readbyqxmd.com/read/29212701/multicenter-evaluation-of-the-eplex%C3%A2-respiratory-pathogen-panel-for-the-detection-of-viral-and-bacterial-respiratory-tract-pathogens-in-nasopharyngeal-swabs
#19
N Esther Babady, Matthew R England, Kristen L Jurcic Smith, Taojun He, Dona Saumya Wijetunge, Yi-Wei Tang, Robin R Chamberland, Marilyn Menegus, Ella M Swierkosz, Robert C Jerris, Wallace Greene
Background: The performance of the new ePlex® Respiratory Pathogen (RP) Panel (GenMark Diagnostics) for the simultaneous detection of 19 viruses (influenza A, influenza A H1, influenza A 2009 H1, influenza A H3, influenza B, adenovirus, coronaviruses [HKU1, OC43, NL63, 229E], human rhinovirus/enterovirus, human metapneumovirus, parainfluenza viruses 1, 2, 3 and 4, respiratory syncytial virus (RSV) [RSVA and RSV B]) and two bacteria (Mycoplasma pneumoniae and Chlamydia pneumoniae) was evaluated.Methods: Prospectively and retrospectively collected nasopharyngeal swab (NPS) specimens (n =2,908) were evaluated using the ePlex RP Panel with the bioMérieux/BioFire FilmArray® Respiratory Panel (BF RP) as the comparator method...
December 6, 2017: Journal of Clinical Microbiology
https://www.readbyqxmd.com/read/29212531/etiology-of-respiratory-tract-infections-in-the-community-and-clinic-in-ilorin-nigeria
#20
Olatunji Kolawole, Michael Oguntoye, Tina Dam, Rumi Chunara
OBJECTIVE: Recognizing increasing interest in community disease surveillance globally, the goal of this study was to investigate whether respiratory viruses circulating in the community may be represented through clinical (hospital) surveillance in Nigeria. RESULTS: Children were selected via convenience sampling from communities and a tertiary care center (n = 91) during spring 2017 in Ilorin, Nigeria. Nasal swabs were collected and tested using polymerase chain reaction...
December 7, 2017: BMC Research Notes
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