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https://www.readbyqxmd.com/read/28340332/super-elongation-complex-promotes-early-hiv-transcription-and-its-function-is-modulated-by-p-tefb
#1
Alona Kuzmina, Simona Krasnopolsky, Ran Taube
Early work on the control of transcription of the human immunodeficiency virus (HIV) laid the foundation for our current knowledge of how RNA Polymerase II is released from promoter-proximal pausing sites and transcription elongation is enhanced. The viral Tat activator recruits Positive Transcription Elongation Factor b (P-TEFb) and Super Elongation Complex (SEC) that jointly drive transcription elongation. While substantial progress in understanding the role of SEC in HIV gene transcription elongation has been obtained, defining of the mechanisms that govern SEC functions is still limited, and the role of SEC in controlling HIV transcription in the absence of Tat is less clear...
February 17, 2017: Transcription
https://www.readbyqxmd.com/read/28339647/detection-of-human-immunodeficiency-virus-1-ribonucleic-acid-in-the-peritoneal-effluent-of-renal-failure-patients-on-highly-active-antiretroviral-therapy
#2
Kwazi C Z Ndlovu, Wilbert Sibanda, Alain Assounga
Background.: We evaluated the shedding of human immunodeficiency virus (HIV)-1 particles into continuous ambulatory peritoneal dialysis (CAPD) effluents of HIV-positive patients with end-stage renal disease (ESRD). Methods.: A total of 58 HIV-positive patients with ESRD on highly active antiretroviral therapy (HAART) who had Tenckhoff catheters inserted between September 2012 and February 2015 were prospectively reviewed and followed for 18 months. Peritoneal dialysis (PD) effluent samples from functioning CAPD catheters and plasma samples were obtained at three points during regular clinic visits on days 45 ± 37, 200 ± 19 and 377 ± 13 after catheter insertion...
February 20, 2017: Nephrology, Dialysis, Transplantation
https://www.readbyqxmd.com/read/28338924/a-nonsynonymous-snp-catalog-of-mycobacterium-tuberculosis-virulence-genes-and-its-use-for-detecting-new-potentially-virulent-sublineages
#3
N E Mikheecheva, M V Zaychikova, A V Melerzanov, V N Danilenko
Mycobacterium tuberculosis is divided into several distinct lineages, and various genetic markers such as IS-elements, VNTR, and SNPs are used for lineage identification. We propose an M. tuberculosis classification approach based on functional polymorphisms in virulence genes. An M. tuberculosis virulence genes catalog has been established, including 319 genes from various protein groups, such as proteases, cell wall proteins, fatty acid and lipid metabolism proteins, sigma factors, toxin-antitoxin systems...
March 11, 2017: Genome Biology and Evolution
https://www.readbyqxmd.com/read/28338013/effect-of-prolonged-freezing-of-semen-on-exosome-recovery-and-biologic-activity
#4
Jennifer L Welch, Marisa N Madison, Joseph B Margolick, Shannon Galvin, Phalguni Gupta, Otoniel Martínez-Maza, Chandravanu Dash, Chioma M Okeoma
Exosomes are important vehicles of intercellular communication that shape host responses to physiologic, tumorigenic, and pathogenic conditions. The composition and function of exosomes are dynamic and depends on the state and condition of the cellular source. In prior work, we found that semen exosomes (SE) from healthy donors who do not use illicit drugs potently inhibit HIV-1. Following semen donation, specimens are either used immediately or frozen for use at a later time. It has been shown that short-term freezing of semen has no effect on SE-mediated HIV-1 inhibition...
March 24, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28337633/the-development-of-an-hiv-risk-environment-scale-of-exotic-dance-clubs
#5
Susan G Sherman, Meredith R Brantley, Carla Zelaya, Quyen Duong, Ralph B Taylor, Jon M Ellen
Exotic dancers have received little research attention despite evidence of high-risk behaviours within exotic dance clubs (EDCs). We developed and assessed the reliability and validity of a risk environment score, examining differences between dancers (n = 107) and other staff (n = 172). In the summer of 2013, anonymous surveys were administered via A-CASI in EDCs (N = 26) in Baltimore among exotic dancers and staff. Surveys consisted of a brief demographic section followed by 65 statements. The overall domain had an alpha = 0...
March 23, 2017: AIDS and Behavior
https://www.readbyqxmd.com/read/28337206/cases-of-impaired-oxidative-burst-in-hiv-exposed-uninfected-infants-neutrophils-a-pilot-study
#6
Anicet Christel Maloupazoa Siawaya, Amandine Mveang-Nzoghe, Ofilia Mvoundza Ndjindji, Armel Mintsa Ndong, Paulin N Essone, Joel Fleury Djoba Siawaya
An increased risk of serious bacterial infections in HIV-exposed uninfected (HEU) infants has been demonstrated. Although neutrophils are essential for the protection of infants against bacterial infections, no study has investigated their profile in HEU infants to date. In this study, we assessed the function of neutrophils in HEU infants using the nitroblue tetrazolium reduction test. Among 25 HEU infants, 9 (36%) showed a reduced ability of their neutrophils to produce reactive oxygen species upon stimulation with bacteria...
2017: Frontiers in Immunology
https://www.readbyqxmd.com/read/28336379/synthetic-nanovaccines-for-immunotherapy
#7
Min Luo, Layla Z Samandi, Zhaohui Wang, Zhijian J Chen, Jinming Gao
Although vaccination is historically one of the most successful strategies for the prevention of infectious diseases, development of vaccines for cancer and many chronic infections, such as HIV, malaria, and tuberculosis, has remained a challenge. Strong and long-lasting antigen-specific T cell responses are critical for therapy of these diseases. A major challenge in achieving a robust CD8+ T cell response is the requirement of spatio-temporal orchestration of antigen cross-presentation in antigen-presenting cells with innate stimulation...
March 20, 2017: Journal of Controlled Release: Official Journal of the Controlled Release Society
https://www.readbyqxmd.com/read/28334859/neurocognitive-function-of-school-aged-hiv-infected-children-in-enugu-nigeria
#8
Kenechukwu K Iloh, Ifeoma J Emodi, Ngozi S Ibeziako, Anthony N Ikefuna, Agozie C Ubesie, Ogochukwu N Iloh, Gideon C Ilechukwu, Adaeze C Ayuk
Background: Evidence has shown neurocognitive problems often exist among human immunodeficiency virus (HIV)-infected children. There are limited data for children in Nigeria. Methods: This was a cross-sectional study of 100 school-aged perinatally HIV-infected children seen in the paediatric HIV clinic and age/sex-matched controls from the general paediatric clinic. Neuro-cognitive functioning was assessed using the Raven's progressive matrices (RPM) that has been adapted for the Nigerian population...
February 20, 2017: Journal of Tropical Pediatrics
https://www.readbyqxmd.com/read/28329286/short-course-tlr9-agonist-treatment-impacts-innate-immunity-and-plasma-viremia-in-individuals-with-hiv-infection
#9
Line Vibholm, Mariane H Schleimann, Jesper F Højen, Thomas Benfield, Rasmus Offersen, Katrine Rasmussen, Rikke Olesen, Anders Dige, Jørgen Agnholt, Judith Grau, Maria Buzon, Burghardt Wittig, Mathias Lichterfeld, Andreas Munk Petersen, Xutao Deng, Mohammed Abdel-Mohsen, Satish K Pillai, Sofie Rutsaert, Wim Trypsteen, Ward De Spiegelaere, Linos Vandekerchove, Lars Østergaard, Thomas A Rasmussen, Paul W Denton, Martin Tolstrup, Ole S Søgaard
Background: Treatment with latency reversing agents (LRA) enhances HIV-1 transcription in vivo but only leads to modest reductions in the size of the reservoir, possibly due to insufficient immune-mediated elimination of infected cells. We hypothesized that a single drug molecule - a novel toll-like receptor 9 (TLR9) agonist, MGN1703 - could function as an enhancer of innate immunity and an LRA in vivo. Methods: We conducted a single-arm, open-label study, where 15 virologically suppressed HIV-1 infected individuals on antiretroviral therapy received 60 mg MGN1703 s...
March 9, 2017: Clinical Infectious Diseases: An Official Publication of the Infectious Diseases Society of America
https://www.readbyqxmd.com/read/28329208/differentiated-hiv-rna-viral-load-monitoring-in-resource-limited-settings-an-economic-analysis
#10
Diana M Negoescu, Zhenhuan Zhang, Heiner C Bucher, Eran Bendavid
Background: Viral load (VL) monitoring for patients receiving antiretroviral therapy (ART) is recommended worldwide. However, the costs of frequent monitoring are a barrier to implementation in resource-limited settings. The extent to which personalized monitoring frequencies may be cost-effective is unknown. Methods: We created a simulation model parameterized using person-level longitudinal data to assess the benefits of flexible monitoring frequencies. Our data-driven model tracked HIV+ individuals for 10 years following ART initiation...
March 1, 2017: Clinical Infectious Diseases: An Official Publication of the Infectious Diseases Society of America
https://www.readbyqxmd.com/read/28328797/activation-senescence-and-inflammation-markers-in-hiv-patients-association-with-renal-function
#11
Alexandra Ozanne, Pierre Duffau, Frédéric-Antoine Dauchy, Claire Rigothier, Cécile Terrien, Estibaliz Lazaro, Charles Cazanave, Sylvie Lawson-Ayayi, Fabrice Bonnet, Patrick Blanco, Linda Wittkop, Isabelle Pellegrin
OBJECTIVES: To assess the association between immune-activation (IA), immune-senescence (IS), inflammation biomarkers and renal function measured by estimated glomerular function rate (eGFR) at inclusion and its evolution over a 3-years follow-up in HIV-infected patients with undetectable viral load. DESIGN: The CIADIS (Chronic Immune Activation anD Senescence) sub-study consecutively included patients between October 2011 and May 2013 enrolled in the ANRS CO3 Aquitaine observational cohort...
March 21, 2017: AIDS
https://www.readbyqxmd.com/read/28323211/metabolic-pathway-of-4-pyridone-3-carboxamide-1%C3%AE-d-ribonucleoside-and-its-effects-on-cellular-energetics
#12
Iwona Pelikant-Malecka, Ewa Kaniewska-Bednarczuk, Sylwia Szrok, Alicja Sielicka, Maciej Śledziński, Czesława Orlewska, Ryszard T Smolenski, Ewa M Słomińska
4-Pirydone-3-carboxamide-1β-D-ribonucleoside (4PYR) is an endogenous nucleoside that could be converted to triphosphates, diphosphates, monophosphates and an analogue of NAD - 4PYRAD. Elevated level of these compounds were observed in chronic renal failure, cancer and active HIV infection. However, little is known about the effect on cell functionality and the metabolic pathways. This study tested effects of 4PYR in different cell types on nucleotide and energy metabolism and clarified enzymes that are involved in conversions of 4PYR...
March 17, 2017: International Journal of Biochemistry & Cell Biology
https://www.readbyqxmd.com/read/28322598/screening-and-functional-profiling-of-small-molecule-hiv-1-entry-and-fusion-inhibitors
#13
Charline Giroud, Yuhong Du, Mariana Marin, Qui Min, Nathan T Jui, Haian Fu, Gregory B Melikyan
HIV-1 entry and fusion with target cells is an important target for antiviral therapy. However, a few currently approved treatments are not effective as monotherapy due to the emergence of drug resistance. This consideration has fueled efforts to develop new bioavailable inhibitors targeting different steps of the HIV-1 entry process. Here, a high-throughput screen was performed of a large library of 100,000 small molecules for HIV-1 entry/fusion inhibitors, using a direct virus-cell fusion assay in a 384 half-well format...
February 2017: Assay and Drug Development Technologies
https://www.readbyqxmd.com/read/28322573/blood-lead-levels-and-neurodevelopmental-function-in-perinatally-hiv-exposed-uninfected-children-in-a-us-based-longitudinal-cohort-study
#14
Katherine Tassiopoulos, Yanling Huo, Joseph Braun, Paige L Williams, Renee Smith, Ann Aschengrau, Sharon Nichols, Rohan Hazra, William A Meyer, Katherine Knapp, Nagamah S Deygoo, George R Seage Iii
BACKGROUND: While children's exposure to environmental lead in the U.S. has decreased, areas of elevated levels remain. Because lead exposure is a risk factor for developmental delays, it should be considered when studying neurodevelopmental effects of in-utero antiretroviral medication (ARV) exposure in the growing population of perinatally HIV-exposed, uninfected children (PHEU). We compared blood lead levels (BPb) in PHEU children enrolled in the Surveillance Monitoring of ART Toxicities (SMARTT) Study to U...
March 21, 2017: AIDS Research and Human Retroviruses
https://www.readbyqxmd.com/read/28322550/multiplex-substrate-profiling-by-mass-spectrometry-for-kinases-reveals-quantitative-substrate-motifs
#15
Nicole Olson Meyer, Anthony J O'Donoghue, Ursula Schulze-Gahmen, Matthew Ravalin, Steven M Moss, Michael B Winter, Giselle M Knudsen, Charles S Craik
The more than 500 protein kinases comprising the human kinome catalyze hundreds of thousands of phosphorylation events to regulate a diversity of cellular functions; however, the extended substrate specificity is still unknown for many of these kinases. We report here a method for quantitatively describing kinase substrate specificity using an unbiased peptide library-based approach with direct measurement of phosphorylation by tandem LC-MS/MS peptide sequencing (Multiplex Substrate Profiling by Mass Spectrometry, MSP-MS)...
March 21, 2017: Analytical Chemistry
https://www.readbyqxmd.com/read/28322167/hiv-specific-adcc-new-technologies-to-study-adcc-and-importance-for-the-hiv-vaccine-field
#16
Bruce D Wines, Hugh Billings, Milla R Mclean, Stephen J Kent, P Mark Hogarth
There is now intense interest in the role of HIV-specific antibodies and the engagement of FcγR functions in the control and prevention of HIV infection. The RV144 vaccine study, natural progression cohorts, and macaque studies all point to a role for antibody dependent cellular cytotoxicity (ADCC) in the control of HIV. However, reliable assays that can be reproducibly used across different laboratories to measure ADCC and other Fc-dependent functions of antibodies are limited. We recently developed a novel ELISA-based assay to detect the binding of viral antigen-specific antibodies to the ectodomains of homo-dimeric Fcγ receptors...
March 20, 2017: Current HIV Research
https://www.readbyqxmd.com/read/28321930/uncovering-allostery-and-regulation-in-samhd1-through-molecular-dynamics-simulations
#17
Kajwal Kumar Patra, Akash Bhattacharya, Swati Bhattacharya
The human sterile alpha motif and HD domain-containing protein 1 (SAMHD1) is a retroviral restriction factor in myeloid cells and non-cycling CD4+ T cells, a feature imputed to its phosphohydrolase activity - the enzyme depletes the cellular dNTP levels inhibiting reverse transcription. The functionally active form of SAMHD1 is an allosterically triggered tetramer which utilizes GTP-Mg(+2) -dNTP cross bridges to link and stabilize adjacent monomers. However, very little is known about how it assembles into a tetramer and how long the tetramer stays intact...
March 21, 2017: Proteins
https://www.readbyqxmd.com/read/28321820/apolipoprotein-e4-suppresses-neuronal-specific-gene-expression-in-maturing-neuronal-progenitor-cells-exposed-to-hiv
#18
Rebeca Geffin, Ricardo Martinez, Alicia de Las Pozas, Biju Issac, Micheline McCarthy
The apolipoprotein ε4 gene allele and the apolipoprotein E4 protein (ApoE4) are important host susceptibility factors linked to neurocognitive disorders associated with HIV infection or Alzheimer's disease. Our previous studies showed differential effects of the two most common human ApoE genotypes, APOE3/3 and APOE3/4, on gene expression by differentiating human neuroepithelial progenitor cells continuously exposed to HIV. To investigate the effects of ApoE3 versus ApoE4 isoforms specifically on maturing neurons, we adapted a human neuronal progenitor cell line, hNP1, with ApoE genotype APOE3/3...
March 20, 2017: Journal of Neuroimmune Pharmacology: the Official Journal of the Society on NeuroImmune Pharmacology
https://www.readbyqxmd.com/read/28321696/accelerated-and-accentuated-neurocognitive-aging-in-hiv-infection
#19
David P Sheppard, Jennifer E Iudicello, Erin E Morgan, Rujvi Kamat, Lindsay R Clark, Gunes Avci, Mark W Bondi, Steven Paul Woods
There is debate as to whether the neurocognitive changes associated with HIV infection represent an acceleration of the typical aging process or more simply reflect a greater accentuated risk for age-related declines. We aimed to determine whether accelerated neurocognitive aging is observable in a sample of older HIV-infected individuals compared to age-matched seronegatives and older old (i.e., aged ≥65) seronegative adults. Participants in a cross-sectional design included 48 HIV-seronegative (O-) and 40 HIV-positive (O+) participants between the ages of 50-65 (mean ages = 55 and 56, respectively) and 40 HIV-seronegative participants aged ≥65 (OO-; mean age = 74) who were comparable for other demographics...
March 20, 2017: Journal of Neurovirology
https://www.readbyqxmd.com/read/28321326/first-canadian-case-report-of-kidney-transplantation-from-an-hiv-positive-donor-to-an-hiv-positive-recipient
#20
Georges Ambaraghassi, Héloïse Cardinal, Daniel Corsilli, Claude Fortin, Marie-Chantal Fortin, Valérie Martel-Laferrière, Jacques Malaise, Michel R Pâquet, Danielle Rouleau
RATIONALE: Kidney transplantation has become standard of care for carefully selected patients living with human immunodeficiency virus (HIV) and end-stage renal disease (ESRD) in the highly active antiretroviral therapy (HAART) era. American and European prospective cohort studies have reported similar patient and graft survival compared with HIV-negative kidney transplant recipients. Despite an increased rate of acute rejection, partially due to drug interactions, HIV immunovirologic parameter generally remains under control during immunosuppression...
2017: Canadian Journal of Kidney Health and Disease
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