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https://www.readbyqxmd.com/read/28918561/marine-polysaccharides-therapeutic-efficacy-and-biomedical-applications
#1
REVIEW
Young-Eun Lee, Hyeongmin Kim, Changwon Seo, Taejun Park, Kyung Bin Lee, Seung-Yup Yoo, Seong-Chul Hong, Jeong Tae Kim, Jaehwi Lee
The ocean contains numerous marine organisms, including algae, animals, and plants, from which diverse marine polysaccharides with useful physicochemical and biological properties can be extracted. In particular, fucoidan, carrageenan, alginate, and chitosan have been extensively investigated in pharmaceutical and biomedical fields owing to their desirable characteristics, such as biocompatibility, biodegradability, and bioactivity. Various therapeutic efficacies of marine polysaccharides have been elucidated, including the inhibition of cancer, inflammation, and viral infection...
September 16, 2017: Archives of Pharmacal Research
https://www.readbyqxmd.com/read/28918477/in-vitro-inhibition-of-hiv-1-replication-in-autologous-cd4-t-cells-indicates-viral-containment-by-multifactorial-mechanisms
#2
Ting Tu, Jianbo Zhan, Danlei Mou, Wei Li, Bin Su, Tong Zhang, Tao Li, Ning Li, Hao Wu, Cong Jin, Huabiao Chen
HIV-1-specific cytotoxic T lymphocytes (CTLs) and neutralizing antibodies (NAbs) are present during chronic infection, but the relative contributions of these effector mechanisms to viral containment remain unclear. Here, using an in vitro model involving autologous CD4(+) T cells, primary HIV-1 isolates, HIV-1-specific CTLs, and neutralizing monoclonal antibodies, we show that b12, a potent and broadly neutralizing monoclonal antibody to HIV-1, was able to block viral infection when preincubated with virus prior to infection, but was much less effective than CTLs at limiting virus replication when added to infected cell cultures...
September 15, 2017: Virologica Sinica
https://www.readbyqxmd.com/read/28918235/identification-of-bluetongue-virus-serotypes-1-4-and-17-co-infections-in-sheep-flocks-during-outbreaks-in-brazil
#3
Lorena Lima Barbosa Guimarães, Júlio César Câmara Rosa, Ana Carolina Diniz Matos, Raquel Aparecida S Cruz, Maria Isabel Maldonado Coelho Guedes, Fernanda Alves Dorella, Henrique César Pereira Figueiredo, Saulo Petinatti Pavarini, Luciana Sonne, Zélia Inês Portela Lobato, David Driemeier
Bluetongue (BT) is a vector-borne viral disease caused by the Bluetongue virus (BTV), an Orbivirus from the Reoviridae family, affecting domestic and wild ruminants. BTV circulation in Brazil was first reported in 1978, and several serological surveys indicate that the virus is widespread, although with varied prevalence. In 2014, BT outbreaks affected sheep flocks in Rio Grande do Sul state, causing significant mortality (18.4%; 91/495) in BTV-infected sheep. In total, seven farms were monitored, and one or two sheep from each farm that died due to clinical signs of BT were necropsied...
September 5, 2017: Research in Veterinary Science
https://www.readbyqxmd.com/read/28918126/high-cmv-igg-antibody-levels-are-associated-to-a-lower-cd4-response-to-antiretroviral-therapy-in-hiv-infected-women
#4
Marina Giuliano, Maria Franca Pirillo, Giuseppe Liotta, Mauro Andreotti, Haswell Jere, Jean-Baptiste Sagno, Fausto Ciccacci, Roberta Amici, Maria Cristina Marazzi, Stefano Vella, Leonardo Palombi, Sandro Mancinelli
BACKGROUND: Virtually all HIV-infected women in sub-Saharan Africa have evidence of Cytomegalovirus (CMV) infection and levels of specific anti-CMV IgG have been suggested to represent more intense reactivation of subclinical infection. Studies have also shown direct influence of CMV on lymphocytes. OBJECTIVE: The aim of this study was to determine if levels of anti-CMV specific antibodies could impact on the immunological response to antiretroviral treatment (ART) in HIV-infected pregnant women...
September 5, 2017: Journal of Clinical Virology: the Official Publication of the Pan American Society for Clinical Virology
https://www.readbyqxmd.com/read/28918076/simultaneous-detection-of-wheat-dwarf-virus-northern-cereal-mosaic-virus-barley-yellow-striate-mosaic-virus-and-rice-black-streaked-dwarf-virus-in-wheat-by-multiplex-rt-pcr
#5
Peipei Zhang, Yan Liu, Wenwen Liu, Sebastien Massart, Xifeng Wang
Wheat dwarf virus (WDV), barley yellow striate mosaic virus (BYSMV), rice black-streaked dwarf virus (RBSDV) and northern cereal mosaic virus (NCMV) are four viruses infecting wheat and causing similar symptoms. In this paper, a multiplex reverse transcription polymerase chain reaction (m-RT-PCR) method has been developed for the simultaneous detection and discrimination of these viruses. The protocol uses specific primer set for each virus and produces four distinct fragments (273, 565, 783 and 1296bp), detecting the presence of RBSDV, BYSMV, WDV and NCMV, respectively...
September 13, 2017: Journal of Virological Methods
https://www.readbyqxmd.com/read/28917841/graphene-vp40-interactions-and-potential-disruption-of-the-ebola-virus-matrix-filaments
#6
Jeevan B Gc, Rudramani Pokhrel, Nisha Bhattarai, Kristen A Johnson, Bernard S Gerstman, Robert V Stahelin, Prem P Chapagain
Ebola virus infections cause hemorrhagic fever that often results in very high fatality rates. In addition to exploring vaccines, development of drugs is also essential for treating the disease and preventing the spread of the infection. The Ebola virus matrix protein VP40 exists in various conformational and oligomeric forms and is a potential pharmacological target for disrupting the virus life-cycle. Here we explored graphene-VP40 interactions using molecular dynamics simulations and graphene pelleting assays...
September 13, 2017: Biochemical and Biophysical Research Communications
https://www.readbyqxmd.com/read/28917654/the-anticancer-functions-of-rig-i-like-receptors-rig-i-and-mda5-and-their-applications-in-cancer-therapy
#7
REVIEW
Yuanbing Wu, Xinqiang Wu, Longhuo Wu, Xiangcai Wang, Zhiping Liu
Cancer is a major cause of death worldwide, and its incidence and mortality continuously increase in China. Nowadays, cancer heavily influences our health and constitutes enormous burden on society and families. Although there are many tools for cancer treatment, but the overall therapeutic effect is poor. In addition, cancer cells often develop resistance to therapy due to defective cell death or immune escape mechanisms. Therefore, it is a promising way for cancer treatment to effectively activate apoptosis and conquer immunosuppression...
August 31, 2017: Translational Research: the Journal of Laboratory and Clinical Medicine
https://www.readbyqxmd.com/read/28917488/gene-expression-regulation-of-the-tlr9-and-myd88-dependent-pathways-in-rock-bream-against-rock-bream-iridovirus-rbiv-infection
#8
Myung-Hwa Jung, Sung-Ju Jung
Rock bream iridovirus (RBIV), which is a member of the Megalocytivirus genus, causes severe mass mortalities in rock bream in Korea. To date, the innate immune defense mechanisms of rock bream against RBIV is unclear. In this study, we assessed the expression levels of genes related to TLR9 and MyD88-dependent pathways in RBIV-infected rock bream in high, low or no mortality conditions. In the high mortality group (100% mortality at 15 days post infection (dpi)), high levels of TLR9 and MyD88 expressions (6...
September 13, 2017: Fish & Shellfish Immunology
https://www.readbyqxmd.com/read/28916998/emergency-neurologic-life-support-meningitis-and-encephalitis
#9
David F Gaieski, Nicole F O'Brien, Ricardo Hernandez
Bacterial meningitis and viral encephalitis, particularly herpes simplex encephalitis, are severe neurological infections that, if not treated promptly and effectively, lead to poor neurological outcome or death. Because of the value of early recognition and treatment, meningitis and encephalitis was chosen as an Emergency Neurological Life Support protocol. This protocol provides a practical approach to recognition and urgent treatment of bacterial meningitis and encephalitis. Appropriate imaging, spinal fluid analysis, and early empiric treatment are discussed...
September 15, 2017: Neurocritical Care
https://www.readbyqxmd.com/read/28916832/design-of-multivalent-inhibitors-for-preventing-cellular-uptake
#10
Veronika Schubertová, Francisco J Martinez-Veracoechea, Robert Vácha
Cellular entry, the first crucial step of viral infection, can be inhibited by molecules adsorbed on the virus surface. However, apart from using stronger affinity, little is known about the properties of such inhibitors that could increase their effectiveness. Our simulations showed that multivalent inhibitors can be designed to be much more efficient than their monovalent counterparts. For example, for our particular simulation model, a single multivalent inhibitor spanning 5 to 6 binding sites is enough to prevent the uptake compared to the required 1/3 of all the receptor binding sites needed to be blocked by monovalent inhibitors...
September 15, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28916807/envelope-glycoprotein-mobility-on-hiv-1-particles-depends-on-the-virus-maturation-state
#11
Jakub Chojnacki, Dominic Waithe, Pablo Carravilla, Nerea Huarte, Silvia Galiani, Jörg Enderlein, Christian Eggeling
Human immunodeficiency virus type 1 (HIV-1) assembles as immature particles, which require the proteolytic cleavage of structural polyprotein Gag and the clustering of envelope glycoprotein Env for infectivity. The details of mechanisms underlying Env clustering remain unknown. Here, we determine molecular dynamics of Env on the surface of individual HIV-1 particles using scanning fluorescence correlation spectroscopy on a super-resolution STED microscope. We find that Env undergoes a maturation-induced increase in mobility, highlighting diffusion as one cause for Env clustering...
September 15, 2017: Nature Communications
https://www.readbyqxmd.com/read/28916773/functional-organization-of-cytoplasmic-inclusion-bodies-in-cells-infected-by-respiratory-syncytial-virus
#12
Vincent Rincheval, Mickael Lelek, Elyanne Gault, Camille Bouillier, Delphine Sitterlin, Sabine Blouquit-Laye, Marie Galloux, Christophe Zimmer, Jean-François Eleouet, Marie-Anne Rameix-Welti
Infection of cells by respiratory syncytial virus induces the formation of cytoplasmic inclusion bodies (IBs) where all the components of the viral RNA polymerase complex are concentrated. However, the exact organization and function of these IBs remain unclear. In this study, we use conventional and super-resolution imaging to dissect the internal structure of IBs. We observe that newly synthetized viral mRNA and the viral transcription anti-terminator M2-1 concentrate in IB sub-compartments, which we term "IB-associated granules" (IBAGs)...
September 15, 2017: Nature Communications
https://www.readbyqxmd.com/read/28916759/influenza-d-in-italy-towards-a-better-understanding-of-an-emerging-viral-infection-in-swine
#13
Emanuela Foni, Chiara Chiapponi, Laura Baioni, Irene Zanni, Marianna Merenda, Carlo Rosignoli, Constantinos S Kyriakis, Mario Vittorio Luini, Maria Lucia Mandola, Luca Bolzoni, Arrigo Daniele Nigrelli, Silvia Faccini
Influenza D virus (IDV), a new member of the Orthomyxoviridae family, was first reported in 2011 in swine in Oklahoma, and consequently found in cattle across North America and Eurasia. To investigate the circulation of IDV among pigs in Italy, in the period between June 2015 and May 2016, biomolecular and virological tests were performed on 845 clinical samples collected from 448 pig farms affected by respiratory distress located in the Po Valley. Serological tests were conducted on 3698 swine sera, including archive sera collected in 2009, as well as samples collected in 2015 from the same region...
September 15, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28916737/determining-ribavirin-s-mechanism-of-action-against-lassa-virus-infection
#14
Paola Carrillo-Bustamante, Thi Huyen Tram Nguyen, Lisa Oestereich, Stephan Günther, Jeremie Guedj, Frederik Graw
Ribavirin is a broad spectrum antiviral which inhibits Lassa virus (LASV) replication in vitro but exhibits a minor effect on viremia in vivo. However, ribavirin significantly improves the disease outcome when administered in combination with sub-optimal doses of favipiravir, a strong antiviral drug. The mechanisms explaining these conflicting findings have not been determined, so far. Here, we used an interdisciplinary approach combining mathematical models and experimental data in LASV-infected mice that were treated with ribavirin alone or in combination with the drug favipiravir to explore different putative mechanisms of action for ribavirin...
September 15, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28916719/kir2ds2-recognizes-conserved-peptides-derived-from-viral-helicases-in-the-context-of-hla-c
#15
Mohammed M Naiyer, Sorcha A Cassidy, Andrea Magri, Vanessa Cowton, Kevin Chen, Salah Mansour, Hariklia Kranidioti, Berenice Mbirbindi, Pauline Rettman, Scott Harris, Liam J Fanning, Arend Mulder, Franz H J Claas, Andrew D Davidson, Arvind H Patel, Marco A Purbhoo, Salim I Khakoo
Killer cell immunoglobulin-like receptors (KIRs) are rapidly evolving species-specific natural killer (NK) cell receptors associated with protection against multiple different human viral infections. We report that the activating receptor KIR2DS2 directly recognizes viral peptides derived from conserved regions of flaviviral superfamily 2 RNA helicases in the context of major histocompatibility complex class I. We started by documenting that peptide LNPSVAATL from the hepatitis C virus (HCV) helicase binds HLA-C*0102, leading to NK cell activation through engagement of KIR2DS2...
September 15, 2017: Science Immunology
https://www.readbyqxmd.com/read/28916655/tethering-il2-to-its-receptor-il2r%C3%AE-enhances-anti-tumor-activity-and-expansion-of-natural-killer-nk92-cells
#16
Youssef Jounaidi, Joseph F Cotten, Keith W Miller, Stuart A Forman
Interleukin-2 (IL2) is an immunostimulatory cytokine for key immune cells including T cells and natural killer (NK) cells. Systemic IL2 supplementation could enhance NK-mediated immunity in a variety of diseases ranging from neoplasms to viral infection. However, its systemic use is restricted by its serious side effects and limited efficacy due to activation of T regulatory cells (Tregs). IL2 signaling is mediated through interactions with a multi-subunit receptor complex containing IL2Rα, IL2Rβ and IL2Rγ...
September 15, 2017: Cancer Research
https://www.readbyqxmd.com/read/28916522/viral-infection-sensitizes-human-fetal-membranes-to-bacterial-lipopolysaccharide-by-mertk-inhibition-and-inflammasome-activation
#17
Sarah N Cross, Julie A Potter, Paulomi Aldo, Ja Young Kwon, Mary Pitruzzello, Mancy Tong, Seth Guller, Carla V Rothlin, Gil Mor, Vikki M Abrahams
Chorioamnionitis, premature rupture of fetal membranes (FMs), and subsequent preterm birth are associated with local infection and inflammation, particularly IL-1β production. Although bacterial infections are commonly identified, other microorganisms may play a role in the pathogenesis. Because viral pandemics, such as influenza, Ebola, and Zika, are becoming more common, and pregnant women are at increased risk for associated complications, this study evaluated the impact that viral infection had on human FM innate immune responses...
September 15, 2017: Journal of Immunology: Official Journal of the American Association of Immunologists
https://www.readbyqxmd.com/read/28916457/in-vitro-activity-of-1h-phenalen-1-one-derivatives-against-acanthamoeba-castellanii-neff-and-their-mechanisms-of-cell-death
#18
Atteneri López-Arencibia, María Reyes-Batlle, Mónica Blanco Freijo, Grant McNaughton-Smith, Patricia Martín-Rodríguez, Leandro Fernández-Pérez, Ines Sifaoui, Carolina Wagner, Ana B García-Méndez, Aitor Rizo Liendo, Carlos J Bethencourt-Estrella, Teresa Abad-Grillo, José E Piñero, Jacob Lorenzo-Morales
Acanthamoeba is an opportunistic pathogen which is the causal agent of a sight-threatening ulceration of the cornea known as Acanthamoeba keratitis (AK) and, more rarely, an infection of the central nervous system called "granulomatous amoebic encephalitis" (GAE). The symptoms of AK are non-specific, and so it can be misdiagnosed as a viral, bacterial, or fungal keratitis. Furthermore, current therapeutic measures against AK are arduous, and show limited efficacy against the cyst stage of Acanthamoeba. 1H-Phenalen-1-one (PH) containing compounds have been isolated from plants and fungi, where they play a crucial role in the defense mechanism of plants...
September 12, 2017: Experimental Parasitology
https://www.readbyqxmd.com/read/28916391/zika-virus-structural-biology-and-progress-in-vaccine-development
#19
REVIEW
Hsiao-Han Lin, Bak-Sau Yip, Li-Min Huang, Suh-Chin Wu
The growing number of zika virus (ZIKV) infections plus a 20-fold increase in neonatal microcephaly in newborns in Brazil have raised alarms in many countries regarding the threat to pregnant women. Instances of microcephaly and central nervous system malformations continue to increase in ZIKV outbreak regions. ZIKV is a small enveloped positive-strand RNA virus belonging to the Flavivirus genus of the Flaviviridae family. High-resolution ZIKV structures recently identified by cryo-electron microscopy indicate that the overall ZIKV structure is similar to those of other flaviviruses...
September 12, 2017: Biotechnology Advances
https://www.readbyqxmd.com/read/28916365/sodium-phenylbutyrate-abrogates-african-swine-fever-virus-replication-by-disrupting-the-virus-induced-hypoacetylation-status-of-histone-h3k9-k14
#20
Gonçalo Frouco, Ferdinando B Freitas, Carlos Martins, Fernando Ferreira
African swine fever virus (ASFV) causes a highly lethal disease in swine for which neither a vaccine nor treatment are available. Recently, a new class of drugs that inhibit histone deacetylases enzymes (HDACs) has received an increasing interest as antiviral agents. Considering studies by others showing that valproic acid, an HDAC inhibitor (HDACi), blocks the replication of enveloped viruses and that ASFV regulates the epigenetic status of the host cell by promoting heterochromatinization and recruitment of class I HDACs to viral cytoplasmic factories, the antiviral activity of four HDACi against ASFV was evaluated in this study...
September 12, 2017: Virus Research
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