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HIV viral dynamics

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https://www.readbyqxmd.com/read/28315414/the-dynamics-of-hcv-specific-antibody-responses-in-hiv-hcv-patients-on-long-term-antiretroviral-therapy
#1
Silvia Lee, Alfred Laiman, Martyn A French, James Flexman, Mark W Watson, Patricia Price
Antibody responses have not been fully characterised in chronically HIV/HCV patients receiving antiretroviral therapy (ART). Seventeen HIV/HCV patients receiving ART were followed for a median (range) interval of 597 (186-766) weeks. Prior to ART, HIV/HCV patients had lower levels of antibodies reactive with HCV core and JFH-1, and lower genotype cross-reactive neutralising antibodies (nAb) titres, than HCV patients. Levels of JFH-1 reactive antibody increased on ART, irrespective of CD4(+) T-cell counts or changes in serum ALT levels...
March 14, 2017: Clinical Immunology: the Official Journal of the Clinical Immunology Society
https://www.readbyqxmd.com/read/28296911/longitudinal-dynamics-of-the-hiv-specific-b-cell-response-during-intermittent-treatment-of-primary-hiv-infection
#2
Godelieve J de Bree, Adam K Wheatley, Rebecca M Lynch, Madhu Prabhakaran, Marlous L Grijsen, Jan M Prins, Stephen D Schmidt, Richard A Koup, John R Mascola, Adrian B McDermott
BACKGROUND: Neutralizing antibodies develop in natural HIV-1 infection. Their development often takes several years and may rely on chronic virus exposure. At the same time recent studies show that treatment early in infection may provide opportunities for immune preservation. However, it is unknown how intermittent treatment in early infection affects development of the humoral immune response over time. We investigate the effect of cART in early HIV infection on the properties of the memory B cell compartment following 6 months of cART or in the absence of treatment...
2017: PloS One
https://www.readbyqxmd.com/read/28295345/the-viral-protein-gp120-decreases-the-acetylation-of-neuronal-tubulin-potential-mechanism-of-neurotoxicity
#3
Valeria Avdoshina, Seamus P Caragher, Erin D Wenzel, Francesca Taraballi, Italo Mocchetti, G Jean Harry
The human immunodeficiency virus (HIV) envelope protein gp120 promotes axonal damage and neurite pruning, similar to that observed in HIV positive subjects with neurocognitive disorders. Thus, gp120 has been used to examine molecular and cellular pathways underlying HIV-mediated neuronal dysfunction. Gp120 binds to tubulin beta III, a component of neuronal microtubules. Microtubule function, which modulates the homeostasis of neurons, is regulated by polymerization and post-translational modifications. Based on these considerations, we tested the hypothesis that gp120 induces dynamic instability of neuronal microtubules...
March 10, 2017: Journal of Neurochemistry
https://www.readbyqxmd.com/read/28251415/a-molecular-dynamics-simulation-study-decodes-the-early-stage-of-the-disassembly-process-abolishing-the-human-samhd1-function
#4
Francesca Cardamone, Federico Iacovelli, Giovanni Chillemi, Mattia Falconi, Alessandro Desideri
The human sterile alpha motif SAM and HD domain-containing protein 1 (SAMHD1) restricts in non-cycling cells type the infection of a large range of retroviruses including HIV-1, reducing the intracellular pool concentration of deoxynucleoside triphosphates (dNTPs) required for the reverse transcription of the viral genome. The enzyme is in equilibrium between different forms depending on bound cofactors and substrate. In this work, two SAMHD1 three-dimensional models have been investigated through classical molecular dynamics simulation, to define the role of cofactors and metal ions in the association of the tetrameric active form...
March 1, 2017: Journal of Computer-aided Molecular Design
https://www.readbyqxmd.com/read/28250813/modelling-the-evolution-of-hiv-1-virulence-in-response-to-imperfect-therapy-and-prophylaxis
#5
David R M Smith, Nicole Mideo
Average HIV-1 virulence appears to have evolved in different directions in different host populations since antiretroviral therapy first became available, and models predict that HIV drugs can select for either higher or lower virulence, depending on how treatment is administered. However, HIV virulence evolution in response to "leaky" therapy (treatment that imperfectly suppresses viral replication) and the use of preventive drugs (pre-exposure prophylaxis) has not been explored. Using adaptive dynamics, we show that higher virulence can evolve when antiretroviral therapy is imperfectly effective and that this evolution erodes some of the long-term clinical and epidemiological benefits of HIV treatment...
March 2017: Evolutionary Applications
https://www.readbyqxmd.com/read/28225803/bacterial-expression-correct-membrane-targeting-and-functional-folding-of-the-hiv-1-membrane-protein-vpu-using-a-periplasmic-signal-peptide
#6
Arpan Deb, William A Johnson, Alexander P Kline, Boston J Scott, Lydia R Meador, Dustin Srinivas, Jose M Martin-Garcia, Katerina Dörner, Chad R Borges, Rajeev Misra, Brenda G Hogue, Petra Fromme, Tsafrir S Mor
Viral protein U (Vpu) is a type-III integral membrane protein encoded by Human Immunodeficiency Virus-1 (HIV- 1). It is expressed in infected host cells and plays several roles in viral progeny escape from infected cells, including down-regulation of CD4 receptors. But key structure/function questions remain regarding the mechanisms by which the Vpu protein contributes to HIV-1 pathogenesis. Here we describe expression of Vpu in bacteria, its purification and characterization. We report the successful expression of PelB-Vpu in Escherichia coli using the leader peptide pectate lyase B (PelB) from Erwinia carotovora...
2017: PloS One
https://www.readbyqxmd.com/read/28222757/spatiotemporal-dynamics-of-hiv-1-transmission-in-france-1999-2014-and-impact-of-targeted-prevention-strategies
#7
Antoine Chaillon, Asma Essat, Pierre Frange, Davey M Smith, Constance Delaugerre, Francis Barin, Jade Ghosn, Gilles Pialoux, Olivier Robineau, Christine Rouzioux, Cécile Goujard, Laurence Meyer, Marie-Laure Chaix
BACKGROUND: Characterizing HIV-1 transmission networks can be important in understanding the evolutionary patterns and geospatial spread of the epidemic. We reconstructed the broad molecular epidemiology of HIV from individuals with primary HIV-1 infection (PHI) enrolled in France in the ANRS PRIMO C06 cohort over 15 years. RESULTS: Sociodemographic, geographic, clinical, biological and pol sequence data from 1356 patients were collected between 1999 and 2014. Network analysis was performed to infer genetic relationships, i...
February 21, 2017: Retrovirology
https://www.readbyqxmd.com/read/28220205/global-properties-of-nested-network-model-with-application-to-multi-epitope-hiv-ctl-dynamics
#8
Cameron Browne
Mathematical modeling and analysis can provide insight on the dynamics of ecosystems which maintain biodiversity in the face of competitive and prey-predator interactions. Of primary interests are the underlying structure and features which stabilize diverse ecological networks. Recently Korytowski and Smith (Theor Ecol 8(1):111-120, 2015) proved that a perfectly nested infection network, along with appropriate life history trade-offs, leads to coexistence and persistence of bacteria-phage communities in a chemostat model...
February 20, 2017: Journal of Mathematical Biology
https://www.readbyqxmd.com/read/28188030/unveiling-of-hiv-dynamics-among-transgender-women-a-respondent-driven-sampling-study-in-rio-de-janeiro-brazil
#9
Beatriz Grinsztejn, Emilia M Jalil, Laylla Monteiro, Luciane Velasque, Ronaldo I Moreira, Ana Cristina F Garcia, Cristiane V Castro, Alícia Krüger, Paula M Luz, Albert Y Liu, Willi McFarland, Susan Buchbinder, Valdilea G Veloso, Erin C Wilson
BACKGROUND: The burden of HIV in transgender women (transwomen) in Brazil remains unknown. We aimed to estimate HIV prevalence among transwomen in Rio de Janeiro and to identify predictors of newly diagnosed HIV infections. METHODS: We recruited transwomen from Rio de Janeiro, Brazil, by respondent-driven sampling. Eligibility criteria were self-identification as transwomen, being 18 years of age or older, living in Rio de Janeiro or its metropolitan area, and having a valid peer recruitment coupon...
February 7, 2017: Lancet HIV
https://www.readbyqxmd.com/read/28183626/stavudine-loaded-gelatin-liposomes-for-hiv-therapy-preparation-characterization-and-in-vitro-cytotoxic-evaluation
#10
Debasis Nayak, Ankita Boxi, Sarbani Ashe, Neethi Chandra Thathapudi, Bismita Nayak
Despite continuous research and availability of 25 different active compounds for treating chronic HIV-1 infection, there is no absolute cure for this deadly disease. Primarily, the residual viremia remains hidden in latently infected reservoir sites and persistently release the viral RNA into the blood stream. The study proposes the dual utilization of the prepared stavudine-containing nanoformulations to control the residual viremia as well as target the reservoir sites. Gelatin nanoformulations containing very low dosage of stavudine were prepared through classical desolvation process and were later loaded in soya lecithin-liposomes...
April 1, 2017: Materials Science & Engineering. C, Materials for Biological Applications
https://www.readbyqxmd.com/read/28178393/a-model-to-estimate-the-probability-of-human-immunodeficiency-virus-and-hepatitis-c-infection-despite-negative-nucleic-acid-testing-among-increased-risk-organ-donors
#11
Pallavi D Annambhotla, Brian M Gurbaxani, Matthew J Kuehnert, Sridhar V Basavaraju
BACKGROUND: In 2013, guidelines were released for reducing the risk of viral bloodborne pathogen transmission through organ transplantation. Eleven criteria were described that result in a donor being designated at increased infectious risk. Human immunodeficiency virus (HIV) and hepatitis C virus (HCV) transmission risk from an increased-risk donor (IRD), despite negative nucleic acid testing (NAT), likely varies based on behavior type and timing. METHODS: We developed a Monte Carlo risk model to quantify probability of HIV among IRDs...
February 8, 2017: Transplant Infectious Disease: An Official Journal of the Transplantation Society
https://www.readbyqxmd.com/read/28174909/longitudinal-viral-dynamics-in-semen-during-early-hiv-infection
#12
Sheldon R Morris, Mitchell Zhao, Davey M Smith, Milenka V Vargas, Susan J Little, Sara Gianella
No abstract text is available yet for this article.
February 15, 2017: Clinical Infectious Diseases: An Official Publication of the Infectious Diseases Society of America
https://www.readbyqxmd.com/read/28159893/dynamics-of-siv-specific-cxcr5-cd8-t-cells-during-chronic-siv-infection
#13
Geetha H Mylvaganam, Daniel Rios, Hadia M Abdelaal, Smita Iyer, Gregory Tharp, Maud Mavinger, Sakeenah Hicks, Ann Chahroudi, Rafi Ahmed, Steven E Bosinger, Ifor R Williams, Pamela J Skinner, Vijayakumar Velu, Rama R Amara
A significant challenge to HIV eradication is the elimination of viral reservoirs in germinal center (GC) T follicular helper (Tfh) cells. However, GCs are considered to be immune privileged for antiviral CD8 T cells. Here, we show a population of simian immunodeficiency virus (SIV)-specific CD8 T cells express CXCR5 (C-X-C chemokine receptor type 5, a chemokine receptor required for homing to GCs) and expand in lymph nodes (LNs) following pathogenic SIV infection in a cohort of vaccinated macaques. This expansion was greater in animals that exhibited superior control of SIV...
February 3, 2017: Proceedings of the National Academy of Sciences of the United States of America
https://www.readbyqxmd.com/read/28134057/hiv-viral-kinetics-and-t-cell-dynamics-in-antiretroviral-na%C3%A3-ve-persons-starting-an-integrase-strand-transfer-inhibitor-and-protease-inhibitor-regimen
#14
Maile Y Karris, Sonia Jain, Tyler R C Day, Josué Pérez-Santiago, Miguel Goicoechea, Michael P Dubé, Xiaoying Sun, Celsa Spina, Eric S Daar, Richard H Haubrich, Sheldon Morris
BACKGROUND: Nucleos(t)ide reverse transcriptase inhibitor (NRTI)-sparing regimens may potentially minimize antiretroviral (ART) toxicities, but demonstrate mixed efficacy and toxicity results. The impact of an integrase strand transfer inhibitor (INSTI) and protease inhibitor (PI) regimen on HIV viral dynamics and T cell kinetics remains underdescribed. OBJECTIVE: To compare the effect of raltegravir + ritonavir boosted lopinavir (RAL + LPV/r) to efavirenz/tenofovir disoproxil fumarate/emtricitabine (EFV/TDF/FTC) on HIV kinetics and T cell dynamics...
March 2017: HIV Clinical Trials
https://www.readbyqxmd.com/read/28132517/genome-wide-analyses-reveal-gene-influence-on-hiv-disease-progression-and-hiv-1c-acquisition-in-southern-africa
#15
Wen Xie, Denis Agniel, Andrey Shevchenko, Sergey V Malov, Anton Svitin, Nikolay Cherkasov, Marianna K Baum, Adriana Campa, Simani Gaseitsiwe, Hermann Bussmann, Joseph Makhema, Richard G Marlink, Vladimir Novitsky, Tun-Hou Lee, Tianxi Cai, Stephen J O'Brien, M Essex
Sub-Saharan Africans infected with HIV-1C make up the largest AIDS-patient population in the world and exhibit large heterogeneity in disease progression before initiating antiretroviral therapy. To identify host variants associated with HIV disease progression, we performed GWAS on a total of 556treatment-naive HIV-infected individuals in Botswana. We characterized the pattern of HIV disease progression using a novel functional principal component analysis (fPCA) which can better capture longitudinal CD4 and viral load (VL)trajectories...
January 28, 2017: AIDS Research and Human Retroviruses
https://www.readbyqxmd.com/read/28126023/dynamic-changes-in-biomarkers-in-acute-human-immunodeficiency-virus-infections-a-case-report
#16
Wei-Ming Gu, Yi Hu, Wei-Zhong Hu, Biao Xu
BACKGROUND: The highest incidence of human immunodeficiency virus infection in China is among men who have sex with men. This case report aims to describe the dynamic changes in biomarkers in an acute human immunodeficiency virus infection of a Han Chinese man who has sex with men, and to illustrate the possibility of using these biomarkers for the early detection of human immunodeficiency virus infection in Chinese hospital settings. CASE PRESENTATION: The 25-year-old Han Chinese male patient presented himself with an 8-day history of symptoms and signs of upper respiratory viral infections to a sexually transmitted infection clinic of a hospital setting in Shanghai...
January 26, 2017: BMC Research Notes
https://www.readbyqxmd.com/read/28103248/effect-of-the-latent-reservoir-on-the-evolution-of-hiv-at-the-within-and-between-host-levels
#17
Hilje M Doekes, Christophe Fraser, Katrina A Lythgoe
The existence of long-lived reservoirs of latently infected CD4+ T cells is the major barrier to curing HIV, and has been extensively studied in this light. However, the effect of these reservoirs on the evolutionary dynamics of the virus has received little attention. Here, we present a within-host quasispecies model that incorporates a long-lived reservoir, which we then nest into an epidemiological model of HIV dynamics. For biologically plausible parameter values, we find that the presence of a latent reservoir can severely delay evolutionary dynamics within a single host, with longer delays associated with larger relative reservoir sizes and/or homeostatic proliferation of cells within the reservoir...
January 2017: PLoS Computational Biology
https://www.readbyqxmd.com/read/28100241/personalized-life-expectancy-and-treatment-benefit-index-of-antiretroviral-therapy
#18
Yanni Xiao, Xiaodan Sun, Sanyi Tang, Yicang Zhou, Zhihang Peng, Jianhong Wu, Ning Wang
BACKGROUND: The progression of Human Immunodeficiency Virus (HIV) within host includes typical stages and the Antiretroviral Therapy (ART) is shown to be effective in slowing down this progression. There are great challenges in describing the entire HIV disease progression and evaluating comprehensive effects of ART on life expectancy for HIV infected individuals on ART. METHODS: We develop a novel summative treatment benefit index (TBI), based on an HIV viral dynamics model and linking the infection and viral production rates to the Weibull function...
January 18, 2017: Theoretical Biology & Medical Modelling
https://www.readbyqxmd.com/read/28095513/changes-in-circulating-b-cell-subsets-associated-with-aging-and-acute-siv-infection-in-rhesus-macaques
#19
W L William Chang, Denise F Gonzalez, Hung T Kieu, Luis D Castillo, Ilhem Messaoudi, Xiaoying Shen, Georgia D Tomaras, Barbara L Shacklett, Peter A Barry, Ellen E Sparger
Aging and certain viral infections can negatively impact humoral responses in humans. To further develop the nonhuman primate (NHP) model for investigating B cell dynamics in human aging and infectious disease, a flow cytometric panel was developed to characterize circulating rhesus B cell subsets. Significant differences between human and macaque B cells included the proportions of cells within IgD+ and switched memory populations and a prominent CD21-CD27+ unswitched memory population detected only in macaques...
2017: PloS One
https://www.readbyqxmd.com/read/28077634/characterization-of-hepatitis-c-virus-hcv-envelope-diversification-from-acute-to-chronic-infection-within-a-sexually-transmitted-hcv-cluster-by-using-single-molecule-real-time-sequencing
#20
Cynthia K Y Ho, Jayna Raghwani, Sylvie Koekkoek, Richard H Liang, Jan T M Van der Meer, Marc Van Der Valk, Menno De Jong, Oliver G Pybus, Janke Schinkel, Richard Molenkamp
In contrast to other available next-generation sequencing platforms, PacBio single-molecule, real-time (SMRT) sequencing has the advantage of generating long reads albeit with a relatively higher error rate in unprocessed data. Using this platform, we longitudinally sampled and sequenced the hepatitis C virus (HCV) envelope genome region (1,680 nucleotides [nt]) from individuals belonging to a cluster of sexually transmitted cases. All five subjects were coinfected with HIV-1 and a closely related strain of HCV genotype 4d...
March 15, 2017: Journal of Virology
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