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https://www.readbyqxmd.com/read/28931083/in-vivo-virulence-of-mhc-adapted-aids-virus-serially-passaged-through-mhc-mismatched-hosts
#1
Sayuri Seki, Takushi Nomura, Masako Nishizawa, Hiroyuki Yamamoto, Hiroshi Ishii, Saori Matsuoka, Teiichiro Shiino, Hironori Sato, Kazuta Mizuta, Hiromi Sakawaki, Tomoyuki Miura, Taeko K Naruse, Akinori Kimura, Tetsuro Matano
CD8+ T-cell responses exert strong suppressive pressure on HIV replication and select for viral escape mutations. Some of these major histocompatibility complex class I (MHC-I)-associated mutations result in reduction of in vitro viral replicative capacity. While these mutations can revert after viral transmission to MHC-I-disparate hosts, recent studies have suggested that these MHC-I-associated mutations accumulate in populations and make viruses less pathogenic in vitro. Here, we directly show an increase in the in vivo virulence of an MHC-I-adapted virus serially-passaged through MHC-I-mismatched hosts in a macaque AIDS model despite a reduction in in vitro viral fitness...
September 20, 2017: PLoS Pathogens
https://www.readbyqxmd.com/read/28926234/using-ultra-performance-liquid-chromatography-quadrupole-time-of-flight-mass-spectrometry-based-chemometrics-for-the-identification-of-anti-angiogenic-biflavonoids-from-edible-garcinia-species
#2
Ping Li, Grace Gar-Lee Yue, Hin-Fai Kwok, Chun-Lin Long, Clara Bik-San Lau, Edward J Kennelly
Garcinia xanthochymus fruits are edible and also used in traditional medicine. Our previous work showed that the isolated natural products from G. xanthochymus fruits have displayed antioxidant activity and cytotoxicity in the colon cancer cells. In this study, we developed a strategy to correlate a zebrafish angiogenesis assay with ultra-performance liquid chromatography quadrupole time of flight mass spectrometry-based chemometric analysis to identify potential anti-angiogenic activity compounds from G. xanthochymus fruits...
September 19, 2017: Journal of Agricultural and Food Chemistry
https://www.readbyqxmd.com/read/28925795/application-of-replication-defective-west-nile-virus-vector-to-non-flavivirus-vaccine-targets
#3
Maryann Giel-Moloney, Michael Vaine, Linong Zhang, Mark Parrington, Beata Gajewska, Thorsten U Vogel, Svetlana O Pougatcheva, Xiaochu Duan, Timothy Farrell, Irina Ustyugova, Sanjay Phogat, Harry Kleanthous, Konstantin V Pugachev
The RepliVaxvaccine platform(RV) is based on flavivirus genomes that are rationally attenuated by deletion. The self-limiting infection provided by RV has been demonstrated to be safe, highly immunogenic and efficacious for several vaccine candidates against flaviviruses. Here respiratory syncytial virus (RSV) F, influenza virus HA, and Simian Immunodeficiency virus (SIV) Env proteins were expressed in place of either prM-E or C-prM-E gene deletions of the West Nile (WN) genome. The resulting RV-RSV, -influenza and -SIV vaccine prototypes replicated efficiently in complementing helper cells expressing the WN structural proteins in trans...
September 19, 2017: Human Vaccines & Immunotherapeutics
https://www.readbyqxmd.com/read/28923862/antiviral-activity-of-bictegravir-and-cabotegravir-against-integrase-inhibitor-resistant-sivmac239-and-hiv-1
#4
Said A Hassounah, Ahmad Alikhani, Maureen Oliveira, Simrat Bharaj, Ruxandra-Ilinca Ibanescu, Nathan Osman, Hong-Tao Xu, Bluma G Brenner, Thibault Mesplède, Mark A Wainberg
Animal models are essential to study novel antiretroviral drugs, resistance-associated mutations (RAMs), and treatment strategies. Bictegravir (BIC) is a novel potent integrase (IN) strand transfer inhibitor (INSTI) that has shown promising results against HIV-1 infection in vitro and in vivo and against clinical isolates with resistance against INSTIs. BIC has a higher genetic barrier to the development of resistance than two clinically approved INSTIs termed raltegravir and elvitegravir. Another clinically approved INSTI, dolutegravir (DTG) also possesses a high genetic barrier to resistance while a fourth compound termed cabotegravir (CAB) is currently in late phases of clinical development...
September 18, 2017: Antimicrobial Agents and Chemotherapy
https://www.readbyqxmd.com/read/28923111/a-novel-coltivirus-related-virus-isolated-from-free-tailed-bats-from-c%C3%A3-te-d-ivoire-is-able-to-infect-human-cells-in-vitro
#5
Sabrina Weiss, Piotr Wojtek Dabrowski, Andreas Kurth, Siv Aina J Leendertz, Fabian H Leendertz
BACKGROUND: Zoonotic transmission events play a major role in the emergence of novel diseases. While such events are virtually impossible to predict, wildlife screening for potential emerging pathogens can be a first step. Driven by recent disease epidemics like severe acute respiratory syndrome (SARS), Middle East respiratory syndrome (MERS), and Ebola, bats have gained special interest as reservoirs of emerging viruses. METHODS: As part of a bigger study investigating pathogens in African bats we screened animals for the presence of known and unknown viruses...
September 18, 2017: Virology Journal
https://www.readbyqxmd.com/read/28918776/-prophylactic-antibiotic-therapy-for-hernia-repair
#6
Siv Fonnes, Barbara Juliane Holzknecht, Magnus Arpi, Jacob Rosenberg
This article aims at outlining and recommending use of prophylactic antibiotic therapy for hernia repair according to literature and newly released guidelines. We do not recommend prophylaxis for elective repair of inguinal and ventral hernias in a low infection risk environment as Denmark except in patients with incisional hernia > 10 cm or presumed increased risk for wound infection, e.g. diabetes or immunosuppression. Antibiotic prophylaxis should always be used in emergent hernia repair. We recommend a prophylactic regimen of second-generation cephalosporin given as a single dose perioperatively...
September 11, 2017: Ugeskrift for Laeger
https://www.readbyqxmd.com/read/28903755/prevalence-of-k13-mutation-and-day-3-positive-parasitaemia-in-artemisinin-resistant-malaria-endemic-area-of-cambodia-a-cross-sectional-study
#7
Soy Ty Kheang, Siv Sovannaroth, Sovann Ek, Say Chy, Phally Chhun, Sokkieng Mao, Sokomar Nguon, Dy Soley Lek, Didier Menard, Neeraj Kak
BACKGROUND: The presence of artemisinin-resistant malaria parasites was confirmed in western Cambodia in 2009. In 2013, mutations in the propeller domain of the kelch protein K13 was found to be associated with artemisinin resistance. A cross-sectional study was conducted to determine the prevalence of Day-3 parasitaemia, estimate the frequency of k13 molecular marker and assess their relationship in the context of operational research. METHODS: Blood smears and filter paper blood spots were collected from febrile patients in Kravanh District, Pursat Province...
September 13, 2017: Malaria Journal
https://www.readbyqxmd.com/read/28900354/knowledge-attitudes-beliefs-and-practices-of-occupational-physicians-towards-seasonal-influenza-vaccination-a-cross-sectional-study-from-north-eastern-italy
#8
REVIEW
M Riccò, S Cattani, F Casagranda, G Gualerzi, C Signorelli
INTRODUCTION: The present study aims to characterize personal attitudes and knowledge of a sample of Italian Occupational Physicians (OPh) towards Seasonal Influenza Vaccine (SIV) in healthcare workers (HCWs). METHODS: In total, 92 OPh (42.4% males, 57.6% females, mean age of 47.3 ± 10.4 years, 50 specialists in Occupational Medicine, 42 specialists in Hygiene and Public Health) were asked about their attitudes towards influenza vaccine, their general knowledge of vaccine practice, their propensity towards vaccines and, eventually, their risk perception about the influenza and influenza vaccine was investigated...
June 2017: Journal of Preventive Medicine and Hygiene
https://www.readbyqxmd.com/read/28893268/a-novel-hiv-vaccine-targeting-the-protease-cleavage-sites
#9
REVIEW
Hongzhao Li, Robert W Omange, Francis A Plummer, Ma Luo
HIV preferentially infects activated CD4+ T cells and mutates rapidly. The classical vaccine approach aimed to generate broad immune responses to full HIV proteins largely failed to address the potential adverse impact of increased number of activated CD4+ T cells as viral targets. Learning from natural immunity observed in a group of HIV resistant Kenyan female sex workers, we are testing a novel vaccine approach. It focuses immune response to the highly conserved sequences surrounding the HIV protease cleavage sites (PCS) to disrupt viral maturation, while limiting excessive immune activation...
September 12, 2017: AIDS Research and Therapy
https://www.readbyqxmd.com/read/28880415/pregnant-substance-abusers-in-voluntary-and-coercive-treatment-in-norway-therapists-reflections-on-change-processes-and-attachment-experiences
#10
Siv Merete Myra, Edle Ravndal, Vigdis Wie Torsteinsson, Anne Kyong Sook Øfsti
AIMS AND OBJECTIVES: To explore therapists' discourses on treatment processes, when working with pregnant substance abusers in voluntary and coercive treatment, and looking for the clinical implications of these discourses. BACKGROUND: Treatment of Substance Use Disorder (SUDs) faces many challenges. One is pregnancy and motherhood, which are vulnerable and complex processes. The literature emphasizes lack of optimal and knowledge-based treatment for this group...
September 7, 2017: Journal of Clinical Nursing
https://www.readbyqxmd.com/read/28879561/backbone-1-h-13-c-and-15-n-chemical-shift-assignment-of-full-length-human-uracil-dna-glycosylase-ung2
#11
Edith Buchinger, Siv Å Wiik, Anna Kusnierczyk, Renana Rabe, Per A Aas, Bodil Kavli, Geir Slupphaug, Finn L Aachmann
Human uracil N-glycosylase isoform 2-UNG2 consists of an N-terminal intrinsically disordered regulatory domain (UNG2 residues 1-92, 9.3 kDa) and a C-terminal structured catalytic domain (UNG2 residues 93-313, 25.1 kDa). Here, we report the backbone (1)H, (13)C, and (15)N chemical shift assignment as well as secondary structure analysis of the N-and C-terminal domains of UNG2 representing the full-length UNG2 protein.
September 6, 2017: Biomolecular NMR Assignments
https://www.readbyqxmd.com/read/28874665/endocytic-sorting-motif-interactions-involved-in-nef-mediated-downmodulation-of-cd4-and-cd3
#12
Santiago Manrique, Daniel Sauter, Florian A Horenkamp, Sebastian Lülf, Hangxing Yu, Dominik Hotter, Kanchan Anand, Frank Kirchhoff, Matthias Geyer
Lentiviral Nefs recruit assembly polypeptide complexes and target sorting motifs in cellular receptors to induce their internalization. While Nef-mediated CD4 downmodulation is conserved, the ability to internalize CD3 was lost in HIV-1 and its precursors. Although both functions play key roles in lentiviral replication and pathogenicity, the underlying structural requirements are poorly defined. Here, we determine the structure of SIVmac239 Nef bound to the ExxxLM motif of another Nef molecule at 2.5 Å resolution...
September 5, 2017: Nature Communications
https://www.readbyqxmd.com/read/28870251/hiv-1-tolerates-changes-in-a-count-in-a-small-segment-of-the-pol-gene
#13
Bep Klaver, Yme van der Velden, Formijn van Hemert, Antoinette C van der Kuyl, Ben Berkhout
BACKGROUND: The HIV-1 RNA genome has a biased nucleotide composition with a surplus of As. Several hypotheses have been put forward to explain this striking phenomenon, but the A-count of the HIV-1 genome has thus far not been systematically manipulated. The reason for this reservation is the likelihood that known and unknown sequence motifs will be affected by such a massive mutational approach, thus resulting in replication-impaired virus mutants. We present the first attempt to increase and decrease the A-count in a relatively small polymerase (pol) gene segment of HIV-1 RNA...
September 5, 2017: Retrovirology
https://www.readbyqxmd.com/read/28864654/exogenous-polyunsaturated-fatty-acids-pufas-impact-membrane-remodeling-and-affect-virulence-phenotypes-among-pathogenic-vibrio-species
#14
Anna R Moravec, Andrew W Siv, Chelsea R Hobby, Emily N Lindsay, Layla V Norbash, Daniel J Shults, Steven J K Symes, David K Giles
The pathogenic Vibrio species (cholerae, parahaemolyticus and vulnificus) represent a constant threat to human health, causing food-borne and skin wound infections as a result of ingestion or exposure to contaminated water and seafood. Recent studies have highlighted Vibrio's ability to acquire fatty acids from environmental sources and assimilate them into cell membranes. The possession and conservation of such machinery provokes consideration of fatty acids as important factors in the pathogenic lifestyle of Vibrio species...
September 1, 2017: Applied and Environmental Microbiology
https://www.readbyqxmd.com/read/28860563/pik3ca-exon9-mutations-associate-with-reduced-survival-and-are-highly-concordant-between-matching-primary-tumors-and-metastases-in-endometrial-cancer
#15
Siv Mjos, Henrica M J Werner, Even Birkeland, Frederik Holst, Anna Berg, Mari K Halle, Ingvild L Tangen, Kanthida Kusonmano, Karen K Mauland, Anne M Oyan, Karl-Henning Kalland, Aurélia E Lewis, Gordon B Mills, Camilla Krakstad, Jone Trovik, Helga B Salvesen, Erling A Hoivik
Mutations of the phosphoinositide-3-kinase (PI3K) catalytic subunit alpha gene (PIK3CA) are frequent in endometrial cancer. We sequenced exon9 and exon20 of PIK3CA in 280 primary endometrial cancers to assess the relationship with clinicopathologic variables, patient survival and associations with PIK3CA mRNA and phospho-AKT1 by gene expression and protein data, respectively. While PIK3CA mutations generally had no impact on survival, and were not associated with clinicopathological variables, patients with exon9 charge-changing mutations, providing a positive charge at the substituted amino acid residue, were associated with poor survival (p = 0...
August 31, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28859166/primate-lentiviruses-use-at-least-three-alternative-strategies-to-suppress-nf-%C3%AE%C2%BAb-mediated-immune-activation
#16
Dominik Hotter, Teresa Krabbe, Elisabeth Reith, Ali Gawanbacht, Nadia Rahm, Ahidjo Ayouba, Benoît Van Driessche, Carine Van Lint, Martine Peeters, Frank Kirchhoff, Daniel Sauter
Primate lentiviruses have evolved sophisticated strategies to suppress the immune response of their host species. For example, HIV-2 and most simian immunodeficiency viruses (SIVs) use their accessory protein Nef to prevent T cell activation and antiviral gene expression by downmodulating the T cell receptor CD3. This Nef function was lost in HIV-1 and other vpu-encoding viruses suggesting that the acquisition of Vpu-mediated NF-κB inhibition reduced the selection pressure for inhibition of T cell activation by Nef...
August 2017: PLoS Pathogens
https://www.readbyqxmd.com/read/28858723/epigallocatechin-3-gallate-inhibits-tlr4-signaling-through-the-67-kda-laminin-receptor-and-effectively-alleviates-acute-lung-injury-induced-by-h9n2-swine-influenza-virus
#17
Ming-Ju Xu, Bao-Jian Liu, Cun-Lian Wang, Guo-Hua Wang, Yong Tian, Shao-Hua Wang, Jun Li, Pei-Yao Li, Rui-Hua Zhang, Dong Wei, Shu-Fei Tian, Tong Xu
Epigallocatechin-3-gallate (EGCG) was found to inhibit the Toll-like receptor 4 (TLR4) pathway involved in influenza virus pathogenesis. Here, the effect of EGCG on TLR4 in an H9N2 virus-induced acute lung injury mouse model was investigated. BALB/c mice were inoculated intranasally with A/Swine/Hebei/108/2002 (H9N2) virus or noninfectious allantoic fluid, and treated with EGCG and E5564 or normal saline orally for 5 consecutive days. PMVECs were treated with EGCG or anti-67kDa laminin receptor (LR). Lung physiopathology, inflammation, oxidative stress, viral replication, and TLR4/NF-κB/Toll-interacting protein (Tollip) pathway in lung tissue and/or PMVECs were investigated...
August 28, 2017: International Immunopharmacology
https://www.readbyqxmd.com/read/28855397/inflammatory-monocytes-expressing-tissue-factor-drive-siv-and-hiv-coagulopathy
#18
Melissa E Schechter, Bruno B Andrade, Tianyu He, George Haret Richter, Kevin W Tosh, Benjamin B Policicchio, Amrit Singh, Kevin D Raehtz, Virginia Sheikh, Dongying Ma, Egidio Brocca-Cofano, Cristian Apetrei, Russel Tracy, Ruy M Ribeiro, Alan Sher, Ivo M B Francischetti, Ivona Pandrea, Irini Sereti
In HIV infection, persistent inflammation despite effective antiretroviral therapy is linked to increased risk of noninfectious chronic complications such as cardiovascular and thromboembolic disease. A better understanding of inflammatory and coagulation pathways in HIV infection is needed to optimize clinical care. Markers of monocyte activation and coagulation independently predict morbidity and mortality associated with non-AIDS events. We identified a specific subset of monocytes that express tissue factor (TF), persist after virological suppression, and trigger the coagulation cascade by activating factor X...
August 30, 2017: Science Translational Medicine
https://www.readbyqxmd.com/read/28852568/etiology-of-acute-respiratory-disease-in-fattening-pigs-in-finland
#19
Minna Haimi-Hakala, Outi Hälli, Tapio Laurila, Mirja Raunio-Saarnisto, Tiina Nokireki, Taina Laine, Suvi Nykäsenoja, Kirsti Pelkola, Joaquim Segales, Marina Sibila, Claudio Oliviero, Olli Peltoniemi, Sinikka Pelkonen, Mari Heinonen
BACKGROUND: The objective of our study was to clinically and etiologically investigate acute outbreaks of respiratory disease in Finland. Our study also aimed to evaluate the clinical use of various methods in diagnosing respiratory infections under field conditions and to describe the antimicrobial resistance profile of the main bacterial pathogen(s) found during the study. METHODS: A total of 20 case herds having finishing pigs showing acute respiratory symptoms and eight control herds showing no clinical signs suggesting of respiratory problems were enrolled in the study...
2017: Porcine Health Management
https://www.readbyqxmd.com/read/28847021/characterisation-and-safety-of-intraperitoneal-perioperative-administration-of-antibacterial-agents-a-systematic-review
#20
Siv Fonnes, Barbara Juliane Holzknecht, Magnus Arpi, Jacob Rosenberg
Background Intraperitoneal drug administration applies treatment at the site of diseases with gynaecological, urological, or gastrointestinal origin. The objective of this systematic review was to investigate perioperative intraperitoneal administration of antibacterial agents to characterise the drugs used and their safety profile. Methods A protocol was registered at PROSPERO (CRD42016038956). A systematic review was conducted and reported according to Preferred Reporting Items for Systematic Reviews and Meta-Analyses (PRISMA)...
August 28, 2017: Drug Research
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