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https://www.readbyqxmd.com/read/28817184/the-influence-of-cytomegalovirus-on-expression-of-hla-g-and-its-ligand-kir2dl4-by-human-peripheral-blood-leucocyte-subsets
#1
Zaid Albayati, Ahmed Alyami, Suliman Alomar, Derek Middleton, Laura Bonnett, Sobia Aleem, Brian F Flanagan, Stephen E Christmas
HLA-G is a non-classical class I HLA antigen, normally expressed in high levels only on extravillous cytotrophoblast. It has immunosuppressive properties in pregnancy and has also been found to be upregulated on leucocytes in viral infection. In this study, proportions of all leucocyte subsets expressing HLA-G were found to be low in healthy subjects positive or negative for cytomegalovirus (CMV). Significantly greater proportions of CD4+CD69+ and CD56+ T cells expressed HLA-G compared to other T cells. However, following stimulation with CMV antigens or intact CMV, proportions of CD4+, CD8+, CD69+ and CD56+ T cells, and also B cells expressing HLA-G were significantly increased in CMV+ subjects...
August 17, 2017: Scandinavian Journal of Immunology
https://www.readbyqxmd.com/read/28815225/chronic-in-vivo-interaction-of-dendritic-cells-expressing-the-ligand-rae-1%C3%AE%C2%B5-with-nk-cells-impacts-nkg2d-expression-and-function
#2
Maelig G Morvan, Marine Champsaur, Boris Reizis, Lewis L Lanier
To investigate how dendritic cells (DCs) interact with NK cells in vivo, we developed a novel mouse model in which Rae-1ε, a ligand of the NKG2D receptor, is expressed in cells with high levels of CD11c. In these CD11c-Rae1 mice, expression of Rae-1 was confirmed on all subsets of DCs and a small subset of B and T cells, but not on NK cells. DC numbers and activation status were unchanged, and NK cells in these CD11c-Rae1 mice presented the same Ly49 repertoire and maturation levels as their littermate wildtype controls...
May 1, 2017: Immunohorizons
https://www.readbyqxmd.com/read/28813507/comparison-of-homologous-and-heterologous-prime-boost-vaccine-approaches-using-modified-vaccinia-ankara-and-soluble-protein-to-induce-neutralizing-antibodies-by-the-human-cytomegalovirus-pentamer-complex-in-mice
#3
Flavia Chiuppesi, Felix Wussow, Louise Scharf, Heidi Contreras, Han Gao, Zhuo Meng, Jenny Nguyen, Peter A Barry, Pamela J Bjorkman, Don J Diamond
Since neutralizing antibodies (NAb) targeting the human cytomegalovirus (HCMV) pentamer complex (PC) potently block HCMV host cell entry, anti-PC NAb induction is thought to be important for a vaccine formulation to prevent HCMV infection. By developing a vaccine strategy based on soluble PC protein and using a previously generated Modified Vaccinia Ankara vector co-expressing all five PC subunits (MVA-PC), we compared HCMV NAb induction by homologous immunization using prime-boost vaccine regimen employing only PC protein or MVA-PC and heterologous immunization using prime-boost combinations of PC protein and MVA-PC...
2017: PloS One
https://www.readbyqxmd.com/read/28811345/inhibitors-of-the-histone-methyltransferases-ezh2-1-induce-a-potent-antiviral-state-and-suppress-infection-by-diverse-viral-pathogens
#4
Jesse H Arbuckle, Paul J Gardina, David N Gordon, Heather D Hickman, Jonathan W Yewdell, Theodore C Pierson, Timothy G Myers, Thomas M Kristie
Epigenetic regulation is based on a network of complexes that modulate the chromatin character and structure of the genome to impact gene expression, cell fate, and development. Thus, epigenetic modulators represent novel therapeutic targets used to treat a range of diseases, including malignancies. Infectious pathogens such as herpesviruses are also regulated by cellular epigenetic machinery, and epigenetic therapeutics represent a novel approach used to control infection, persistence, and the resulting recurrent disease...
August 15, 2017: MBio
https://www.readbyqxmd.com/read/28809151/the-pentameric-complex-of-human-cytomegalovirus-cell-tropism-virus-dissemination-immune-response-and-vaccine-development
#5
Giuseppe Gerna, Maria Grazia Revello, Fausto Baldanti, Elena Percivalle, Daniele Lilleri
Between the 1980s and 1990s, three assays were developed for diagnosis of human cytomegalovirus (HCMV) infections: leuko (L)-antigenemia, l-viremia and l-DNAemia, detecting viral protein pp65, infectious virus and viral DNA, respectively, in circulating leukocytes Repeated initial attempts to reproduce the three assays in vitro using laboratory-adapted strains and infected cell cultures were consistently unsuccessful. Results were totally reversed when wild-type HCMV strains were used to infect either fibroblasts or endothelial cells...
August 15, 2017: Journal of General Virology
https://www.readbyqxmd.com/read/28807767/a-new-clinico-biological-scoring-system-for-the-prediction-of-infection-related-mortality-and-survival-after-allogeneic-hematopoietic-stem-cell-transplantation
#6
Alessandra Forcina, Paola M V Rancoita, Magda Marcatti, Raffaella Greco, Maria Teresa Lupo-Stanghellini, Matteo Carrabba, Vincenzo Marasco, Clelia Di Serio, Massimo Bernardi, Jacopo Peccatori, Consuelo Corti, Attilio Bondanza, Fabio Ciceri
Infection-related mortality (IRM) accounts for a substantial component of non-relapse mortality (NRM) after allogeneic hematopoietic stem cell transplantation (allo-HSCT). No scores have been developed to predict IRM before transplant. Pre-transplant clinical and biochemical data were collected in a study cohort of 607 adult patients receiving allo-HSCT from January 2009 to February 2017. In a training set of 273 patients, multivariate analysis revealed that age >60 years (P=0.003), CMV host/donor serostatus different from negative/negative (P<0...
August 11, 2017: Biology of Blood and Marrow Transplantation
https://www.readbyqxmd.com/read/28807358/pulmonary-calcification-in-a-congenital-cytomegalovirus-infection
#7
Kazuhiro Uda, Yuka Sasaki, Kensuke Shoji, Isao Miyairi
No abstract text is available yet for this article.
August 11, 2017: Journal of Pediatrics
https://www.readbyqxmd.com/read/28806733/the-interaction-between-endogenous-30s-ribosomal-subunit-protein-s11-and-cucumber-mosaic-virus-ls2b-protein-affects-viral-replication-infection-and-gene-silencing-suppressor-activity
#8
Ruilin Wang, Zhiyou Du, Zhenqing Bai, Zongsuo Liang
Cucumber mosaic virus (CMV) is a model virus for plant-virus protein interaction and mechanism research because of its wide distribution, high-level of replication and simple genome structure. The 2b protein is a multifunctional protein encoded by CMV that suppresses RNA silencing-based antiviral defense and contributes to CMV virulence in host plants. In this report, 12 host proteins were identified as CMV LS2b binding partners using the yeast two-hybrid screen system from the Arabidopsis thaliana cDNA library...
2017: PloS One
https://www.readbyqxmd.com/read/28806406/terminal-differentiation-of-t-cells-is-strongly-associated-with-cmv-infection-and-increased-in-hiv-positive-individuals-on-art-and-lifestyle-matched-controls
#9
Thijs Booiman, Ferdinand W Wit, Arginell F Girigorie, Irma Maurer, Davide De Francesco, Caroline A Sabin, Agnes M Harskamp, Maria Prins, Claudio Franceschi, Steven G Deeks, Alan Winston, Peter Reiss, Neeltje A Kootstra
HIV-1-positive individuals on successful antiretroviral therapy (ART) are reported to have higher rates of age-associated non-communicable comorbidities (AANCCs). HIV-associated immune dysfunction has been suggested to contribute to increased AANCC risk. Here we performed a cross-sectional immune phenotype analysis of T cells in ART-treated HIV-1-positive individuals with undetectable vireamia (HIV-positives) and HIV-1-negative individuals (HIV-negatives) over 45 years of age. In addition, two control groups were studied: HIV negative adults selected based on lifestyle and demographic factors (Co-morBidity in Relation to AIDS, or COBRA) and unselected age-matched donors from a blood bank...
2017: PloS One
https://www.readbyqxmd.com/read/28803228/utility-of-routine-urine-cmv-pcr-and-total-serum-igm-testing-of-small-for-gestational-age-infants-a-single-center-review
#10
Michael M Espiritu, Sean Bailey, Elena V Wachtel, Pradeep V Mally
BACKGROUND: Due to the extremely low incidence of TORCH (toxoplasmosis, rubella, CMV, herpes simplex virus) infections, diagnostic testing of all small for gestational age (SGA) infants aimed at TORCH etiologies may incur unnecessary tests and cost. OBJECTIVE: To determine the frequency of urine CMV PCR and total IgM testing among infants with birth weight <10% and the rate of test positivity. To evaluate the frequency of alternative etiologies of SGA in tested infants...
August 14, 2017: Journal of Perinatal Medicine
https://www.readbyqxmd.com/read/28802185/diagnostic-yield-and-clinical-impact-of-routine-cell-culture-for-respiratory-viruses-among-children-with-a-negative-multiplex-rt-pcr-result
#11
M AlGhounaim, Y Xiao, C Caya, J Papenburg
BACKGROUND: Polymerase chain reaction (PCR) is the reference standard for respiratory virus testing. However, cell culture may still have added value in identifying viruses not detected by PCR. OBJECTIVES: We aimed to estimate the yield and clinical impact of routine respiratory virus culture among children with a negative PCR result. STUDY DESIGN: A retrospective cohort study was performed from Jan. 2013 to Sept. 2015. Respiratory samples from hospitalized or immunocompromised patients <18years old were routinely inoculated on traditional tube cell culture monolayers if they tested negative by a PCR assay for 12 respiratory viruses...
July 29, 2017: Journal of Clinical Virology: the Official Publication of the Pan American Society for Clinical Virology
https://www.readbyqxmd.com/read/28801056/clinical-evaluation-of-the-new-roche-platform-of-serological-and-molecular-cytomegalovirus-specific-assays-in-the-diagnosis-and-prognosis-of-congenital-cytomegalovirus-infection
#12
Angela Chiereghin, Claudia Pavia, Liliana Gabrielli, Giulia Piccirilli, Diego Squarzoni, Gabriele Turello, Dino Gibertoni, Giuliana Simonazzi, Maria Grazia Capretti, Marcello Lanari, Tiziana Lazzarotto
Clinical evaluation of the Elecsys(®) CMV IgM, IgG, IgG Avidity and COBAS AmpliPrep/COBAS TaqMan CMV (COBAS CMV) assays (Roche Diagnostics AG) in the diagnosis and prognosis of congenital CMV infection was performed. In this study, 150 preselected clinical samples (50 primary infection sera, 50 amniotic fluid [AF] and 50 newborn urine) were processed using Roche serological/molecular CMV-specific tests. Results were compared with those obtained by routine assays (comparator assays). The Elecsys(®) CMV IgM and IgG assays showed a perfect agreement (100%) with the comparator assays...
August 8, 2017: Journal of Virological Methods
https://www.readbyqxmd.com/read/28797778/cytomegalovirus-reactivation-is-associated-with-increased-risk-of-late-onset-invasive-fungal-disease-following-allogeneic-hematopoietic-stem-cell-transplantation-a-multi-centre-study-in-the-current-era-of-viral-load-monitoring
#13
Michelle K Yong, Michelle Ananda-Rajah, Paul U Cameron, C Orla Morrissey, Andrew Spencer, David Ritchie, Allen C Cheng, Sharon R Lewin, Monica Slavin
Opportunistic infections such as cytomegalovirus (CMV) reactivation and invasive fungal disease (IFD) cause significant morbidity and mortality to recipients of hematopoietic stem cell transplant (HSCT). We aimed to characterise the risk and relationship of CMV reactivation post-HSCT to IFD in the current era of CMV viral load monitoring using highly sensitive plasma DNA. A multi-centre retrospective cohort study was conducted of consecutive patients undergoing allogeneic HSCT from January 2006 to December 2010 in Melbourne, Australia...
August 7, 2017: Biology of Blood and Marrow Transplantation
https://www.readbyqxmd.com/read/28796839/tissue-specific-control-of-latent-cmv-reactivation-by-regulatory-t-cells
#14
Maha Almanan, Jana Raynor, Allyson Sholl, Mei Wang, Claire Chougnet, Rhonda D Cardin, David A Hildeman
Cytomegalovirus (CMV) causes a persistent, lifelong infection. CMV persists in a latent state and undergoes intermittent subclinical viral reactivation that is quelled by ongoing T cell responses. While T cells are critical to maintain control of infection, the immunological factors that promote CMV persistence remain unclear. Here, we investigated the role of regulatory T cells (Treg) in a mouse model of latent CMV infection using Foxp3-diphtheria toxin receptor (Foxp3-DTR) mice. Eight months after infection, MCMV had established latency in the spleen, salivary gland, lung, and pancreas, which was accompanied by an increased frequency of Treg...
August 2017: PLoS Pathogens
https://www.readbyqxmd.com/read/28794912/sensorineural-hearing-loss-in-a-patient-affected-by-congenital-cytomegalovirus-infection-is-it-useful-to-identify-comorbid-pathologies
#15
P Fontana, D Melis, A D'Amico, G Cappuccio, G Auletta, P Vassallo, R Genesio, L Nitsch, W Buffolano
Sensorineural hearing loss (SNHL) is a common defect with a multifactorial etiology. Congenital cytomegalovirus infection (cCMV) is the most common infectious cause, and its early detection allows a prompt pharmacological treatment that can improve hearing prognosis. In a consistent percentage of profound SNHL, genetic causes and/or inner ear malformations are involved; their prompt diagnosis might change therapeutic options. This study reports a case of a 3- year-old female patient with symptomatic cCMV infection who also exhibits developmental delay, dysmorphic facial features, bilateral hearing loss, and cochlear incomplete partition, type 2, in 7q21...
September 2017: Journal of Pediatric Genetics
https://www.readbyqxmd.com/read/28794035/crystal-structure-of-the-dna-binding-domain-of-human-herpesvirus-6a-immediate-early-protein-2
#16
Mitsuhiro Nishimura, Junjie Wang, Aika Wakata, Kento Sakamoto, Yasuko Mori
Immediate early proteins of human herpesvirus 6A (HHV-6A) are expressed at the outset of lytic infection, and thereby regulate viral gene expression. Immediate early protein 2 (IE2) of HHV-6A is a trans-activator that drives a variety of promoters. The C-terminal region of HHV-6A IE2 is shared among IE2 homologs in beta-herpesviruses, and is involved in dimerization, DNA binding, and transcription factor binding. In this study, the structure of the C-terminal domain (IE2-CTD) was determined by X-ray crystallography at a resolution of 2...
August 9, 2017: Journal of Virology
https://www.readbyqxmd.com/read/28791493/risk-of-infectious-diseases-among-first-degree-relatives-of-transplant-recipients-who-develop-cmv-infection-is-the-infectious-phenotype-inheritable
#17
C Ekenberg, I P Lodding, N E Wareham, S S Sørensen, H Sengeløv, F Gustafsson, A Rasmussen, M Perch, J D Lundgren, M Helleberg
Transplant recipients are at high risk of cytomegalovirus (CMV) infection. Mechanisms explaining the variation in risk of infections are far from fully elucidated. We hypothesised that host genetics explains part of the variation in risk of infection and examined if relatives of recipients with CMV infection have higher rates of severe infections compared to relatives of recipients without this infectious phenotype. In a register-based study, we included first-degree relatives of transplant recipients and examined the risk of hospitalisation due to overall infection or viral infection and risk of death among relatives of recipients who developed CMV infection within the first year of transplantation compared to relatives of recipients without CMV...
August 8, 2017: European Journal of Clinical Microbiology & Infectious Diseases
https://www.readbyqxmd.com/read/28791125/nkg2c-memory-like-nk-cells-contribute-to-the-control-of-hiv-viremia-during-primary-infection-optiprim-anrs-147
#18
Françoise Gondois-Rey, Antoine Chéret, Samuel Granjeaud, Françoise Mallet, Ghislain Bidaut, Camille Lécuroux, Mickaël Ploquin, Michaela Müller-Trutwin, Christine Rouzioux, Véronique Avettand-Fenoël, Alessandro Moretta, Gilles Pialoux, Cécile Goujard, Laurence Meyer, Daniel Olive
Natural-killer (NK) cells are important immune effectors during a viral infection. Latent CMV infection is widely spread and was demonstrated to shape the NK cell repertoire through the NKG2C receptor. An expansion of NKG2C(+) NK cells has been reported during primary HIV infection (PHI), but their role is not known. We previously found a correlation between the maturation state of the NK cell compartment and a lower viral load by studying patients from the ANRS 147 Optiprim trial. We investigated here extensively the NKG2C(+) NK cells at the time of PHI and its evolution after 3 months of early antiretroviral therapy (combination antiretroviral therapy (cART))...
July 2017: Clinical & Translational Immunology
https://www.readbyqxmd.com/read/28783452/off-the-shelf-virus-specific-t-cells-to-treat-bk-virus-human-herpesvirus-6-cytomegalovirus-epstein-barr-virus-and-adenovirus-infections-after-allogeneic-hematopoietic-stem-cell-transplantation
#19
Ifigeneia Tzannou, Anastasia Papadopoulou, Swati Naik, Kathryn Leung, Caridad A Martinez, Carlos A Ramos, George Carrum, Ghadir Sasa, Premal Lulla, Ayumi Watanabe, Manik Kuvalekar, Adrian P Gee, Meng-Fen Wu, Hao Liu, Bambi J Grilley, Robert A Krance, Stephen Gottschalk, Malcolm K Brenner, Cliona M Rooney, Helen E Heslop, Ann M Leen, Bilal Omer
Purpose Improvement of cure rates for patients treated with allogeneic hematopoietic stem-cell transplantation (HSCT) will require efforts to decrease treatment-related mortality from severe viral infections. Adoptively transferred virus-specific T cells (VSTs) generated from eligible, third-party donors could provide broad antiviral protection to recipients of HSCT as an immediately available off-the-shelf product. Patient and Methods We generated a bank of VSTs that recognized five common viral pathogens: Epstein-Barr virus (EBV), adenovirus (AdV), cytomegalovirus (CMV), BK virus (BKV), and human herpesvirus 6 (HHV-6)...
August 7, 2017: Journal of Clinical Oncology: Official Journal of the American Society of Clinical Oncology
https://www.readbyqxmd.com/read/28783043/nbeal2-is-required-for-neutrophil-and-nk-cell-function-and-pathogen-defense
#20
John M Sowerby, David C Thomas, Simon Clare, Marion Espéli, Jose A Guerrero, Kim Hoenderdos, Katherine Harcourt, Morgan Marsden, Juneid Abdul-Karim, Mathew Clement, Robin Antrobus, Yagnesh Umrania, Philippa R Barton, Shaun M Flint, Jatinder K Juss, Alison M Condliffe, Paul A Lyons, Ian R Humphreys, Edwin R Chilvers, Willem H Ouwehand, Gordon Dougan, Kenneth Gc Smith
Mutations in the human NBEAL2 gene cause gray platelet syndrome (GPS), a bleeding diathesis characterized by a lack of α granules in platelets. The functions of the NBEAL2 protein have not been explored outside platelet biology, but there are reports of increased frequency of infection and abnormal neutrophil morphology in patients with GPS. We therefore investigated the role of NBEAL2 in immunity by analyzing the phenotype of Nbeal2-deficient mice. We found profound abnormalities in the Nbeal2-deficient immune system, particularly in the function of neutrophils and NK cells...
August 7, 2017: Journal of Clinical Investigation
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