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https://www.readbyqxmd.com/read/28100611/the-envelope-gene-of-transmitted-hiv-1-resists-a-late-ifn%C3%AE-induced-block
#1
Suzannah J Rihn, Toshana L Foster, Idoia Busnadiego, Muhamad Afiq Aziz, Joseph Hughes, Stuart J D Neil, Sam J Wilson
: Type I interferon (IFN) signaling engenders an antiviral state that likely plays an important role in constraining HIV-1 transmission and contributes to defining subsequent AIDS pathogenesis. Type II IFN (IFNγ) also induces an antiviral state but is often primarily considered to be an immunomodulatory cytokine. We report that IFNγ stimulation can induce an antiviral state that can be both distinct from that of type I interferon, and can potently inhibit HIV-1 in primary CD4+ T cells and a number of human cell lines...
January 18, 2017: Journal of Virology
https://www.readbyqxmd.com/read/28086923/multiple-hiv-1-m%C3%A2-%C3%A2-hiv-1-o-dual-infections-and-new-hiv-1-mo-inter-group-recombinant-forms-detected-in-cameroon
#2
Fabienne De Oliveira, Thomas Mourez, Aurélia Vessiere, Paul-Alain Ngoupo, Elodie Alessandri-Gradt, François Simon, Dominique Rousset, Jean-Christophe Plantier
BACKGROUND: Due to the prevalence of HIV-1 group M and the endemicity of HIV-1 group O infections in Cameroon, patients may be infected with both viruses and/or with HIV-1/MO recombinant forms. Such atypical infections may be deleterious in terms of diagnosis and therapeutic management due to the high divergence of HIV-1/O. The aim of this study was to identify prospectively such atypical infections in Cameroon. RESULTS: Based on serological screening by env-V3 serotyping and a molecular strategy using group-specific (RT)-PCRs, we identified 10 Cameroonian patients harboring three different profiles of infection: (1) 4 HIV-1/M + O dual infections without evidence of recombinant; (2) 5 recombinants associated with one or both parental strains; and (3) 1 new recombinant form without parental strains...
January 13, 2017: Retrovirology
https://www.readbyqxmd.com/read/28075409/the-hiv-1-vpr-protein-a-multifaceted-target-for-therapeutic-intervention
#3
REVIEW
María Eugenia González
The human immunodeficiency virus type 1 (HIV-1) Vpr protein is an attractive target for antiretroviral drug development. The conservation both of the structure along virus evolution and the amino acid sequence in viral isolates from patients underlines the importance of Vpr for the establishment and progression of HIV-1 disease. While its contribution to virus replication in dividing and non-dividing cells and to the pathogenesis of HIV-1 in many different cell types, both extracellular and intracellular forms, have been extensively studied, its precise mechanism of action nevertheless remains enigmatic...
January 10, 2017: International Journal of Molecular Sciences
https://www.readbyqxmd.com/read/28039047/error-rates-pcr-recombination-and-sampling-depth-in-hiv-1-whole-genome-deep-sequencing
#4
REVIEW
Fabio Zanini, Johanna Brodin, Jan Albert, Richard A Neher
Deep sequencing is a powerful and cost-effective tool to characterize the genetic diversity and evolution of virus populations. While modern sequencing instruments readily cover viral genomes many thousand fold and very rare variants can in principle be detected, sequencing errors, amplification biases, and other artifacts can limit sensitivity and complicate data interpretation. For this reason, the number of studies using whole genome deep sequencing to characterize viral quasi-species in clinical samples is still limited...
December 27, 2016: Virus Research
https://www.readbyqxmd.com/read/28036372/collapse-of-cytolytic-potential-in-siv-specific-cd8-t-cells-following-acute-siv-infection-in-rhesus-macaques
#5
Emily R Roberts, Diane G Carnathan, Hui Li, George M Shaw, Guido Silvestri, Michael R Betts
Poor maintenance of cytotoxic factor expression among HIV-specific CD8+ T cells, in part caused by dysregulated expression of the transcription factor T-bet, is associated with HIV disease progression. However, the precise evolution and context in which CD8+ T cell cytotoxic functions become dysregulated in HIV infection remain unclear. Using the rhesus macaque (RM) SIV infection model, we evaluated the kinetics of SIV-specific CD8+ T cell cytolytic factor expression in peripheral blood, lymph node, spleen, and gut mucosa from early acute infection through chronic infection...
December 2016: PLoS Pathogens
https://www.readbyqxmd.com/read/28034590/hiv-infected-patients-with-and-without-lipodystrophy-under-combined-antiretroviral-therapy-evaluation-of-body-composition
#6
Inês Grenha, Joana Oliveira, Eva Lau, Ana Cristina Santos, António Sarmento, Jorge Pereira, Davide Carvalho, Paula Freitas
In HIV-infected patients, combined antiretroviral therapy (cART) is associated to adipose tissue redistribution known as lipodystrophy and associated cardiometabolic risk. This study aimed to evaluate the evolution of body composition in HIV-infected patients, with and without lipodystrophy, over 2 yr. We evaluated anthropometric parameters and body composition by whole-body dual-energy X-ray absorptiometry in 144 HIV-infected patients on cART. We defined lipodystrophy by fat mass ratio. Lipodystrophy was present in 45...
December 27, 2016: Journal of Clinical Densitometry
https://www.readbyqxmd.com/read/28005986/a-systematic-review-of-cost-effectiveness-studies-reporting-cost-per-daly-averted
#7
Peter J Neumann, Teja Thorat, Yue Zhong, Jordan Anderson, Megan Farquhar, Mark Salem, Eileen Sandberg, Cayla J Saret, Colby Wilkinson, Joshua T Cohen
INTRODUCTION: Calculating the cost per disability-adjusted life years (DALYs) averted associated with interventions is an increasing popular means of assessing the cost-effectiveness of strategies to improve population health. However, there has been no systematic attempt to characterize the literature and its evolution. METHODS: We conducted a systematic review of cost-effectiveness studies reporting cost-per-DALY averted from 2000 through 2015. We developed the Global Health Cost-Effectiveness Analysis (GHCEA) Registry, a repository of English-language cost-per-DALY averted studies indexed in PubMed...
2016: PloS One
https://www.readbyqxmd.com/read/28005040/-genetic-diversity-of-human-immunodeficiency-viruses-and-antiretroviral-therapy
#8
M R Bobkova
The lecture is devoted to the analysis of the state-of-the-art of the impact of genetic diversity of human immunodeficiency (HIV) viruses on the pattern of infection and the efficiency of antiretroviral therapy (ART). It provides brief information on the origin and evolution of HIV and on the current classification of their genetic variants. The molecular epidemiological situation of HIV infection in Russia and nearby states and the major molecular HIV variants that are dominant in these countries, as well as their origin and prevalence trends are characterized...
2016: Terapevticheskiĭ Arkhiv
https://www.readbyqxmd.com/read/27999056/switching-from-a-ritonavir-boosted-pi-to-dolutegravir-as-an-alternative-strategy-in-virologically-suppressed-hiv-infected-individuals
#9
Eugènia Negredo, Vicente Estrada, Pere Domingo, Maria Del Mar Gutiérrez, Gracia M Mateo, Jordi Puig, Anna Bonjoch, Arelly Ornelas, Patricia Echeverría, Carla Estany, Jessica Toro, Bonaventura Clotet
BACKGROUND: Switching from PIs to dolutegravir in virologically suppressed HIV-infected individuals has not been assessed. OBJECTIVES: The principal aim was to assess the evolution of bone mineral density (BMD) when switching from a ritonavir-boosted PI to dolutegravir in HIV-infected patients with osteopenia or osteoporosis. The secondary objective was to assess the antiviral efficacy and safety of the switch therapy. METHODS: This randomized, multicentre study assessed changes in BMD, bone turnover markers, and antiviral efficacy and safety in 73 virologically suppressed patients with osteopenia/osteoporosis taking a ritonavir-boosted PI plus abacavir/lamivudine who were randomized to switch from PI to dolutegravir (DOLU group, n = 37) or continue with a PI (PI group, n = 36)...
December 20, 2016: Journal of Antimicrobial Chemotherapy
https://www.readbyqxmd.com/read/27999018/cyclosporine-a-in-addition-to-standard-art-during-primary-hiv-1-infection-pilot-randomized-clinical-trial
#10
David Nicolás, Juan Ambrosioni, Omar Sued, Mercé Brunet, María López-Diéguez, Christian Manzardo, Fernando Agüero, Montserrat Tuset, Montserrat Plana, Alberto C Guardo, María Mar Mosquera, M Ángeles Muñoz-Fernández, Miguel Caballero, M Ángeles Marcos, José M Gatell, Elisa de Lazzari, Teresa Gallart, José M Miró
BACKGROUND: Initiating ART during acute/recent HIV-1 infection reduces viral reservoir formation. It has been proposed that, during this phase, the size of the viral reservoir could be further reduced by the association of immunomodulatory therapy with ART. Contradictory results have emerged, however, from two trials evaluating the impact on immune recovery and the viral reservoir of adding cyclosporine A to ART during primary HIV-1 infection. PATIENTS AND METHODS: Twenty patients with acute/recent HIV-1 infection were randomized to receive ART alone (tenofovir, emtricitabine and lopinavir/ritonavir) or associated with 8 weeks of cyclosporine A (0...
December 20, 2016: Journal of Antimicrobial Chemotherapy
https://www.readbyqxmd.com/read/27993242/hiv-protease-inhibitors-alter-amyloid-precursor-protein-processing-via-%C3%AE-site-amyloid-precursor-protein-cleaving-enzyme-1-translational-up-regulation
#11
Patrick J Gannon, Cagla Akay-Espinoza, Alan C Yee, Lisa A Briand, Michelle A Erickson, Benjamin B Gelman, Yan Gao, Norman J Haughey, M Christine Zink, Janice E Clements, Nicholas S Kim, Gabriel Van De Walle, Brigid K Jensen, Robert Vassar, R Christopher Pierce, Alexander J Gill, Dennis L Kolson, J Alan Diehl, Joseph L Mankowski, Kelly L Jordan-Sciutto
Mounting evidence implicates antiretroviral (ARV) drugs as potential contributors to the persistence and evolution of clinical and pathological presentation of HIV-associated neurocognitive disorders in the post-ARV era. Based on their ability to induce endoplasmic reticulum (ER) stress in various cell types, we hypothesized that ARV-mediated ER stress in the central nervous system resulted in chronic dysregulation of the unfolded protein response and altered amyloid precursor protein (APP) processing. We used in vitro and in vivo models to show that HIV protease inhibitor (PI) class ARVs induced neuronal damage and ER stress, leading to PKR-like ER kinase-dependent phosphorylation of the eukaryotic translation initiation factor 2α and enhanced translation of β-site APP cleaving enzyme-1 (BACE1)...
January 2017: American Journal of Pathology
https://www.readbyqxmd.com/read/27979047/statin-therapy-and-low-density-lipoprotein-cholesterol-reduction-in-hiv-infected-individuals-after-acute-coronary-syndrome-results-from-the-pacs-hiv-lipids-substudy
#12
Franck Boccara, Joe Miantezila Basilua, Murielle Mary-Krause, Sylvie Lang, Emmanuel Teiger, Philippe Gabriel Steg, Christian Funck-Brentano, Pierre-Marie Girard, Dominique Costagliola, Ariel Cohen, Marguerite Guiguet
: Knowledge about lipid interventions in secondary prevention in HIV-infected individuals is limited; studies are sparse. METHODS: A prospective observational multicenter study enrolled 282 patients on statin 1 month after first acute coronary syndrome (ACS) (95 HIV-infected individuals, 187 HIV-uninfected). Data on fasting lipids (total cholesterol [TC], low-density lipoprotein cholesterol, high-density lipoprotein cholesterol [HDL-C], non-HDL-C, triglycerides, TC/HDL-C ratio) were collected over 3 years...
January 2017: American Heart Journal
https://www.readbyqxmd.com/read/27966518/impact-of-highly-active-antiretroviral-therapy-in-the-development-and-remission-of-oral-plasmablastic-lymphoma
#13
Vivian Petersen Wagner, Lisley Ortiz, Helena Pereira Rodrigues da Silva, Luise Meurer, João Julio da Cunha Filho, Marco Antonio Trevizani Martins, Manoela Domingues Martins
Plasmablastic lymphoma (PBL) represents a rare type of non-Hodgkin lymphoma associated with human immunodeficiency virus (HIV) infection. The impact of highly active antiretroviral therapy (HAART) in this tumor is poorly known due to its small incidence. This study reports a case of a 33-year-old HIV-positive woman who was referred to the Stomatology Department complaining about a painful gingival growth and cervical nodule both with 20 days of evolution. The lesions appeared 7 months after the patient stopped HAART...
September 2016: Indian Journal of Dental Research: Official Publication of Indian Society for Dental Research
https://www.readbyqxmd.com/read/27964762/new-tools-to-analyze-overlapping-coding-regions
#14
Amir H Bayegan, Juan Antonio Garcia-Martin, Peter Clote
BACKGROUND: Retroviruses transcribe messenger RNA for the overlapping Gag and Gag-Pol polyproteins, by using a programmed -1 ribosomal frameshift which requires a slippery sequence and an immediate downstream stem-loop secondary structure, together called frameshift stimulating signal (FSS). It follows that the molecular evolution of this genomic region of HIV-1 is highly constrained, since the retroviral genome must contain a slippery sequence (sequence constraint), code appropriate peptides in reading frames 0 and 1 (coding requirements), and form a thermodynamically stable stem-loop secondary structure (structure requirement)...
December 13, 2016: BMC Bioinformatics
https://www.readbyqxmd.com/read/27959955/experimental-estimation-of-the-effects-of-all-amino-acid-mutations-to-hiv-s-envelope-protein-on-viral-replication-in-cell-culture
#15
Hugh K Haddox, Adam S Dingens, Jesse D Bloom
HIV is notorious for its capacity to evade immunity and anti-viral drugs through rapid sequence evolution. Knowledge of the functional effects of mutations to HIV is critical for understanding this evolution. HIV's most rapidly evolving protein is its envelope (Env). Here we use deep mutational scanning to experimentally estimate the effects of all amino-acid mutations to Env on viral replication in cell culture. Most mutations are under purifying selection in our experiments, although a few sites experience strong selection for mutations that enhance HIV's replication in cell culture...
December 2016: PLoS Pathogens
https://www.readbyqxmd.com/read/27942005/treatment-outcomes-and-costs-of-providing-antiretroviral-therapy-at-a-primary-health-clinic-versus-a-hospital-based-hiv-clinic-in-south-africa
#16
Lawrence C Long, Sydney B Rosen, Alana Brennan, Faith Moyo, Celeste Sauls, Denise Evans, Shookdev L Modi, Ian Sanne, Matthew P Fox
BACKGROUND: In 2010 South Africa revised its HIV treatment guidelines to allow the initiation and management of patients on antiretroviral therapy (ART) by nurses, rather than solely doctors, under a program called NIMART (Nurse Initiated and Managed Antiretroviral Therapy). We compared the outcomes and costs of NIMART between the two major public sector HIV treatment delivery models in use in South Africa today, primary health clinics and hospital-based HIV clinics. METHODS AND FINDINGS: The study was conducted at one hospital-based outpatient HIV clinic and one primary health clinic (PHC) in Gauteng Province...
2016: PloS One
https://www.readbyqxmd.com/read/27941971/plasma-metabolomics-biosignature-according-to-hiv-stage-of-infection-pace-of-disease-progression-viremia-level-and-immunological-response-to-treatment
#17
Bruno Scarpelini, Michelle Zanoni, Maria Cecilia Araripe Sucupira, Hong-Ha M Truong, Luiz Mario Ramos Janini, Ismael Dale Cotrin Segurado, Ricardo Sobhie Diaz
BACKGROUND: We evaluated plasma samples HIV-infected individuals with different phenotypic profile among five HIV-infected elite controllers and five rapid progressors after recent HIV infection and one year later and from 10 individuals subjected to antiretroviral therapy, five of whom were immunological non-responders (INR), before and after one year of antiretroviral treatment compared to 175 samples from HIV-negative patients. A targeted quantitative tandem mass spectrometry metabolomics approach was used in order to determine plasma metabolomics biosignature that may relate to HIV infection, pace of HIV disease progression, and immunological response to treatment...
2016: PloS One
https://www.readbyqxmd.com/read/27938348/early-antiretroviral-treatment-eart-limits-viral-diversity-over-time-in-a-long-term-hiv-viral-suppressed-perinatally-infected-child
#18
Paolo Palma, Paola Zangari, Claudia Alteri, Hyppolite K Tchidjou, Emma Concetta Manno, Giuseppina Liuzzi, Carlo Federico Perno, Paolo Rossi, Ada Bertoli, Stefania Bernardi
BACKGROUND: HIV genetic diversity implicates major challenges for the control of viral infection by the immune system and for the identification of an effective immunotherapeutic strategy. With the present case report we underline as HIV evolution could be effectively halted by early antiretroviral treatment (eART). Few cases supported this evidence due to the difficulty of performing amplification and sequencing analysis in long-term viral suppressed patients. Here, we reported the case of limited HIV-1 viral evolution over time in a successful early treated child...
December 9, 2016: BMC Infectious Diseases
https://www.readbyqxmd.com/read/27928014/histidine-375-modulates-cd4-binding-in-hiv-1-crf01_ae-envelope-glycoproteins
#19
Daria Zoubchenok, Maxime Veillette, Jérémie Prévost, Eric Sanders-Buell, Kshitij Wagh, Bette Korber, Agnès L Chenine, Andrés Finzi
: The envelope glycoproteins (Env) from human immunodeficiency virus type 1 (HIV-1) mediate viral entry. The binding of the HIV-1 gp120 glycoprotein to CD4 triggers conformational changes in gp120 that allow high-affinity binding to its coreceptors. Contrary to all other Envs from the same phylogenetic group M, which possess a serine (S) at position 375, those from CRF01_AE strains possess a histidine (H) at this location. This residue is part of the Phe43 cavity where residue 43 of CD4 (a phenylalanine) engages with the gp120...
December 7, 2016: Journal of Virology
https://www.readbyqxmd.com/read/27923769/recombination-in-hepatitis-c-virus-is-not-uncommon-among-people-who-inject-drugs-in-kolkata-india
#20
Debanjali Gupta, Kallol Saha, Aritra Biswas, Rushna Firdaus, Monika Ghosh, Provash Chandra Sadhukhan
Recombination in RNA virus is a rare event in the survival and evolution to evade host immune system. This is increasing within high risk group population (HRG) due to super infection that occurs by continuous sharing of common drug equipment by HCV infected or HIV-HCV co-infected recurrent drug users. Recombination causes impediment to vaccine development and therapeutic intervention as standard HCV treatment is still genotype specific. Blood samples of 194 people who inject drugs (PWID) were collected from an Opioid Substitution Therapy Centre in Kolkata, India...
December 5, 2016: Infection, Genetics and Evolution
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