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https://www.readbyqxmd.com/read/27913791/circadian-transcription-factor-bmal1-regulates-innate-immunity-against-select-rna-viruses
#1
Tanmay Majumdar, Jayeeta Dhar, Sonal Patel, Roman Kondratov, Sailen Barik
BMAL1 (brain and muscle ARNT-like protein 1, also known as MOP3 or ARNT3) belongs to the family of the basic helix-loop-helix (bHLH)-PAS domain-containing transcription factors, and is a key component of the molecular oscillator that generates circadian rhythms. Here, we report that BMAL1-deficient cells are significantly more susceptible to infection by two major respiratory viruses of the Paramyxoviridae family, namely RSV and PIV3. Embryonic fibroblasts from Bmal1(-/-) mice produced nearly 10-fold more progeny virus than their wild type controls...
December 1, 2016: Innate Immunity
https://www.readbyqxmd.com/read/27911568/nf%C3%AE%C2%BAb-mediates-mesenchymal-transition-remodeling-and-pulmonary-fibrosis-in-response-to-chronic-inflammation-by-viral-rna-patterns
#2
Bing Tian, Igor Patrikeev, Lorenzo Ochoa, Gracie Vargas, KarryAnne K Belanger, Julia Litvinov, Istvan Boldogh, Bill T Ameredes, Massoud Motamedi, Allan R Brasier
Airway remodeling is resultant of a complex multi-cellular response associated with a progressive decline of pulmonary function in patients with chronic airway disease. Here, repeated infections with respiratory viruses are linked with airway remodeling through largely unknown mechanisms. Although acute activation of the Toll like receptor (TLR)3 pathway by extracellular poly(I:C) induces innate signaling through the NFkB transcription factor in human small airway epithelial cells (hSAECs), prolonged (repetitive or tonic) poly(I:C) stimulation produces chronic stress fiber formation, mesenchymal transition and activation of a fibrotic program...
December 2, 2016: American Journal of Respiratory Cell and Molecular Biology
https://www.readbyqxmd.com/read/27911218/aberrant-t-cell-immunity-triggered-by-human-respiratory-syncytial-virus-and-human-metapneumovirus-infection
#3
Andrea E González, Margarita K Lay, Evelyn L Jara, Janyra A Espinoza, Roberto S Gómez, Jorge Soto, Claudia A Rivera, Katia Abarca, Susan M Bueno, Claudia A Riedel, Alexis M Kalergis
Human Respiratory syncytial virus (hRSV) and human metapneumovirus (hMPV) are the two major etiological viral agents of lower respiratory tract diseases, affecting mainly infants, young children and the elderly. Although the infection of both viruses trigger an antiviral immune response that mediate viral clearance and disease resolution in immunocompetent individuals, the promotion of long-term immunity appears to be deficient and reinfection are common throughout life. A possible explanation for this phenomenon is that hRSV and hMPV, can induce aberrant T cell responses, which leads to exacerbated lung inflammation and poor T and B cell memory immunity...
December 2, 2016: Virulence
https://www.readbyqxmd.com/read/27911143/factors-predicting-life-threatening-infections-with-respiratory-syncytial-virus-in-adult-patients
#4
Se Yoon Park, Taeeun Kim, Young Rock Jang, Min-Chul Kim, Yong Pil Chong, Sang-Oh Lee, Sang-Ho Choi, Yang Soo Kim, Jun Hee Woo, Sung-Han Kim
BACKGROUND: Respiratory syncytial virus (RSV) is a significant cause of acute respiratory illness with a clinical spectrum ranging from self-limiting upper respiratory infection to severe lower respiratory infection in elderly persons as well as young children. However, there are limited data on risk factors for life-threatening infections that could guide the appropriate use of antiviral agents in adult patients with RSV. METHODS: We conducted a retrospective cohort study from October 2013 to September 2015...
December 2, 2016: Infectious Diseases
https://www.readbyqxmd.com/read/27908830/protective-efficacy-of-fc-targeting-conserved-influenza-virus-m2e-antigen-expressed-by-lactobacillus-plantarum
#5
Wen-Tao Yang, Gui-Lian Yang, Qian Wang, Hai-Bin Huang, Yan-Long Jiang, Chun-Wei Shi, Jian-Zhong Wang, Ke-Yan Huang, Yu-Bei Jin, Chun-Feng Wang
The influenza A (H1N1) virus is a highly contagious acute respiratory disease affecting pigs and humans. This disease causes severe economic loss in many countries, and developing mucosal vaccines is an efficient strategy to control the influenza virus. The neonatal Fc receptor (FcRn) plays an important role in transferring IgG across polarized epithelial cells. In the present study, an oral vaccine was developed using Lactobacillus plantarum to deliver the internal influenza viral protein M2e fused to an IgG Fc fragment...
November 28, 2016: Antiviral Research
https://www.readbyqxmd.com/read/27908797/molecular-detection-and-characterization-of-respiratory-syncytial-virus-b-genotypes-circulating-in-pakistani-children
#6
Uzma Bashir, Nadia Nisar, Nayab Mahmood, Muhammad Masroor Alam, Hajra Sadia, Syed Sohail Zahoor Zaidi
Respiratory syncytial virus (RSV) is the major cause of acute lower respiratory tract infections in young children, but very little is known about its epidemiology and circulating genotypes in Pakistan. This study analyzed the epidemiological and molecular characteristics of RSV B genotypes in Pakistani children below 5years with acute respiratory tract infections (ARIs) during three consecutive winter seasons from 2010 to 2013. A total of 1941 samples were analyzed for RSV infection by real time PCR and 24% (472/1941) samples were found positive out of which 22...
November 28, 2016: Infection, Genetics and Evolution
https://www.readbyqxmd.com/read/27908781/heme-oxygenase-1-metabolite-biliverdin-not-iron-inhibits-porcine-reproductive-and-respiratory-syndrome-virus-replication
#7
Angke Zhang, Hong Duan, Na Li, Lijuan Zhao, Fengxing Pu, Baicheng Huang, Chunyan Wu, Yuchen Nan, Taofeng Du, Yang Mu, Qin Zhao, Yani Sun, Gaiping Zhang, Julian A Hiscox, En-Min Zhou, Shuqi Xiao
Porcinereproductiveandrespiratorysyndromevirus (PRRSV) causes significant economic losses to the pork industry worldwide. Previously, we demonstrated that heme oxygenase-1 (HO-1) interferes with PRRSV replication. To elucidate the mechanisms involved, here we assess whether the HO-1 downstream metabolites biliverdin (BV) and/or iron mediate the HO-1 antiviral effect. We demonstrate a BV concentration-dependent suppression of PRRSV replication and show that virions are not directly inactivated by BV. Additionally, BV or N-acetyl cysteine (NAC) significantly reduced reactive oxygen species (ROS) in PRRSV-infected MARC-145 cells; however, because NAC did not reduce viral load, the BV antiviral effect is independent of decreased ROS levels...
November 28, 2016: Free Radical Biology & Medicine
https://www.readbyqxmd.com/read/27908639/animal-models-of-respiratory-syncytial-virus-infection
#8
Geraldine Taylor
Human respiratory syncytial virus (hRSV) is a major cause of respiratory disease and hospitalisation of infants, worldwide, and is also responsible for significant morbidity in adults and excess deaths in the elderly. There is no licensed hRSV vaccine or effective therapeutic agent. However, there are a growing number of hRSV vaccine candidates that have been developed targeting different populations at risk of hRSV infection. Animal models of hRSV play an important role in the preclinical testing of hRSV vaccine candidates and although many have shown efficacy in preclinical studies, few have progressed to clinical trials or they have had only limited success...
November 29, 2016: Vaccine
https://www.readbyqxmd.com/read/27907013/development-and-implementation-of-the-ebola-traveler-monitoring-program-and-clinical-outcomes-of-monitored-travelers-during-october-may-2015-minnesota
#9
Aaron DeVries, Pamela Talley, Kristin Sweet, Susan Kline, Patricia Stinchfield, Pritish Tosh, Richard Danila
BACKGROUND: In October 2014, the United States began actively monitoring all persons who had traveled from Guinea, Liberia, and Sierra Leone in the previous 21 days. State public health departments were responsible for monitoring all travelers; Minnesota has the largest Liberian population in the United States. The MDH Ebola Clinical Team (ECT) was established to assess travelers with symptoms of concern for Ebola virus disease (EVD), coordinate access to healthcare at appropriate facilities including Ebola Assessment and Treatment Units (EATU), and provide guidance to clinicians...
2016: PloS One
https://www.readbyqxmd.com/read/27905537/unique-nonstructural-proteins-of-pneumonia-virus-of-mice-pvm-promote-degradation-of-interferon-ifn-pathway-components-and-ifn-stimulated-gene-proteins
#10
Jayeeta Dhar, Sailen Barik
Pneumonia Virus of Mice (PVM) is the only virus that shares the Pneumovirus genus of the Paramyxoviridae family with Respiratory Syncytial Virus (RSV). A deadly mouse pathogen, PVM has the potential to serve as a robust animal model of RSV infection, since human RSV does not fully replicate the human pathology in mice. Like RSV, PVM also encodes two nonstructural proteins that have been implicated to suppress the IFN pathway, but surprisingly, they exhibit no sequence similarity with their RSV equivalents. The molecular mechanism of PVM NS function, therefore, remains unknown...
December 1, 2016: Scientific Reports
https://www.readbyqxmd.com/read/27905101/a-review-on-antiviral-activity-of-the-himalayan-medicinal-plants-traditionally-used-to-treat-bronchitis-and-related-symptoms
#11
REVIEW
Rahila Amber, Muhammad Adnan, Akash Tariq, Sakina Mussarat
OBJECTIVES: Bronchitis is a common respiratory tract infection of humans mainly caused by influenza virus, rhinovirus, adenovirus, coronavirus and respiratory syncytial virus. The aim of this review was to gather fragmented literature on ethnomedicinal plants used against bronchitis in the Himalayan region and their in-vitro validation against bronchitis causing viral pathogens. KEY FINDINGS: Present review contains ethnomedicines of total 55 plants from different countries of the Himalayas...
December 1, 2016: Journal of Pharmacy and Pharmacology
https://www.readbyqxmd.com/read/27904883/interactions-of-respiratory-viruses-and-the-nasal-microbiota-during-the-first-year-of-life-in-healthy-infants
#12
Insa Korten, Moana Mika, Shkipe Klenja, Elisabeth Kieninger, Ines Mack, Maria Teresa Barbani, Meri Gorgievski, Urs Frey, Markus Hilty, Philipp Latzin
Traditional culture techniques have shown that increased bacterial colonization is associated with viral colonization; however, the influence of viral colonization on the whole microbiota composition is less clear. We thus aimed to understand the interaction of viral infections and the nasal microbiota in early life to appraise their roles in disease development. Thirty-two healthy, unselected infants were included in this prospective longitudinal cohort study within the first year of life. Biweekly nasal swabs (n = 559) were taken, and the microbiota was analyzed by 16S rRNA pyrosequencing, and 10 different viruses and 2 atypical bacteria were characterized by real-time PCR (combination of seven duplex samples)...
November 2016: MSphere
https://www.readbyqxmd.com/read/27903740/protective-t-cell-responses-featured-by-concordant-recognition-of-middle-east-respiratory-syndrome-coronavirus-derived-cd8-t-cell-epitopes-and-host-mhc
#13
William J Liu, Jiaming Lan, Kefang Liu, Yao Deng, Yanfeng Yao, Shaolian Wu, Hong Chen, Lingling Bao, Haifeng Zhang, Min Zhao, Qihui Wang, Lingxia Han, Yan Chai, Jianxun Qi, Jincun Zhao, Songdong Meng, Chuan Qin, George F Gao, Wenjie Tan
The coordinated recognition of virus-derived T cell epitopes and MHC molecules by T cells plays a pivotal role in cellular immunity-mediated virus clearance. It has been demonstrated that the conformation of MHC class I (MHC I) molecules can be adjusted by the presented peptide, which impacts T cell activation. However, it is still largely unknown whether the conformational shift of MHC I influences the protective effect of virus-specific T cells. In this study, utilizing the Middle East respiratory syndrome coronavirus-infected mouse model, we observed that through the unusual secondary anchor Ile5, a CD8(+) T cell epitope drove the conformational fit of Trp(73) on the α1 helix of murine MHC I H-2K(d) In vitro renaturation and circular dichroism assays indicated that this shift of the structure did not influence the peptide/MHC I binding affinity...
November 30, 2016: Journal of Immunology: Official Journal of the American Association of Immunologists
https://www.readbyqxmd.com/read/27903593/respiratory-syncytial-virus-infection-detection-and-new-options-for-prevention-and-treatment
#14
REVIEW
Cameron Griffiths, Steven J Drews, David J Marchant
Respiratory syncytial virus (RSV) infection is a significant cause of hospitalization of children in North America and one of the leading causes of death of infants less than 1 year of age worldwide, second only to malaria. Despite its global impact on human health, there are relatively few therapeutic options available to prevent or treat RSV infection. Paradoxically, there is a very large volume of information that is constantly being refined on RSV replication, the mechanisms of RSV-induced pathology, and community transmission...
January 2017: Clinical Microbiology Reviews
https://www.readbyqxmd.com/read/27903461/clinical-characteristics-and-outcome-of-respiratory-syncytial-virus-infection-among-adults-hospitalized-with-influenza-like-illness-in-france
#15
Paul Loubet, Nezha Lenzi, Martine Valette, Vincent Foulongne, Anne Krivine, Nadhira Houhou, Gisele Lagathu, Sylvie Rogez, Sophie Alain, Xavier Duval, Florence Galtier, Deborah Postil, Pierre Tattevin, Philippe Vanhems, Fabrice Carrat, Bruno Lina, Odile Launay
OBJECTIVES: The aim of this study was to analyze characteristics and outcome of RSV infection in adults hospitalized with influenza-like illness (ILI). METHODS: Patients hospitalized with ILI were included in this prospective, multicenter study carried out in six French hospitals during three consecutive influenza seasons (2012-2015). RSV and other respiratory viruses were detected by multiplex PCR in nasopharyngeal swabs. Risk factors for RSV infection were identified by backward stepwise logistic regression analysis...
November 26, 2016: Clinical Microbiology and Infection
https://www.readbyqxmd.com/read/27902753/emphysema-distribution-and-diffusion-capacity-predict-emphysema-progression-in-human-immunodeficiency-virus-infection
#16
Janice M Leung, Andrea Malagoli, Antonella Santoro, Giulia Besutti, Guido Ligabue, Riccardo Scaglioni, Darlene Dai, Cameron Hague, Jonathon Leipsic, Don D Sin, Sf Paul Man, Giovanni Guaraldi
BACKGROUND: Chronic obstructive pulmonary disease (COPD) and emphysema are common amongst patients with human immunodeficiency virus (HIV). We sought to determine the clinical factors that are associated with emphysema progression in HIV. METHODS: 345 HIV-infected patients enrolled in an outpatient HIV metabolic clinic with ≥2 chest computed tomography scans made up the study cohort. Images were qualitatively scored for emphysema based on percentage involvement of the lung...
2016: PloS One
https://www.readbyqxmd.com/read/27902420/interleukin-1-receptor-antagonist-il-1ra-an-early-immunomodulatory-cytokine-induced-by-porcine-reproductive-and-respiratory-syndrome-virus-prrsv
#17
Teerawut Nedumpun, Piya Wongyanin, Chaitawat Sirisereewan, Patcharee Ritprajuk, Tanapat Palaga, Roongroje Thanawongnuwech, Sanipa Suradhat
Porcine reproductive and respiratory syndrome virus (PRRSV) infection poorly induces pro-inflammatory cytokines (IL-1, IL-6, TNF-α) and type I IFN production during the early phase of infection. Our microarray analysis indicated strong upregulation of the IL1RA gene in type 2 PRRSV infected monocyte-derived dendritic cells (MoDC). Interleukin-1 receptor antagonist (IL-1Ra) is an early inhibitory cytokine, which suppresses pro-inflammatory cytokines and T lymphocyte responses. To investigate the induction of IL-1Ra by PRRSV, MoDC were cultured with type 2 PRRSV or other swine viruses...
November 23, 2016: Journal of General Virology
https://www.readbyqxmd.com/read/27902362/identification-and-interspecies-transmission-of-a-novel-bocaparvovirus-among-different-bat-species-in-china
#18
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/27902356/luciferase-tagged-wild-type-and-tropism-deficient-mouse-cytomegaloviruses-reveal-early-dynamics-of-host-colonization-following-peripheral-challenge
#19
Helen Farrell, Martha Oliveira, Kate Macdonald, Joseph Yunis, Michael Mach, Kimberley Bruce, Philip Stevenson, Rhonda Cardin, Nicholas Davis-Poynter
Cytomegaloviruses (CMVs) establish persistent, systemic infections and cause disease by maternal-fetal transfer, suggesting that their dissemination is a key target for anti-viral intervention. Late clinical presentation has meant that human CMV dissemination is not well understood. Murine CMV provides a tractable model. Whole mouse imaging of virus-expressed luciferase has proved a useful way to track systemic infections. MCMV, in which the abundant lytic gene M78 was luciferase tagged via a self-cleaving peptide (M78-LUC), allowed serial, unbiased imaging of systemic and peripheral infection without significant virus attenuation...
October 26, 2016: Journal of General Virology
https://www.readbyqxmd.com/read/27902340/viral-bacterial-interactions-in-the-respiratory-tract
#20
Carla Bellinghausen, Gernot Gu Rohde, Paul Hm Savelkoul, Emiel Fm Wouters, Frank Rm Stassen
In the respiratory tract, viruses and bacteria can interact on multiple levels. It is well known that respiratory viruses, particularly influenza viruses, increase the susceptibility to secondary bacterial infections. Numerous mechanisms, including compromised physical and immunological barriers, and changes in the microenvironment have hereby been shown to contribute to the development of secondary bacterial infections. In contrast, our understanding of how bacteria shape a response to subsequent viral infection is still limited...
October 18, 2016: Journal of General Virology
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