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HIV Modeling

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https://www.readbyqxmd.com/read/28453849/association-between-frailty-and-components-of-the-frailty-phenotype-with-modifiable-risk-factors-and-antiretroviral-therapy
#1
Kristine M Erlandson, Kunling Wu, Susan L Koletar, Robert C Kalayjian, Ronald J Ellis, Babafemi Taiwo, Frank J Palella, Katherine Tassiopoulos
The impact of antiretroviral therapy (ART) on frailty among human immunodeficiency virus (HIV)-infected adults has not been well described. HIV-infected participants aged ≥40 years with initial ART receipt through a randomized, controlled AIDS Clinical Trials Group trial completed a frailty assessment. Ordinal logistic regression models examined factors associated with frailty. Of 1016 participants, 6% were frail, and 38% were prefrail. Frailty was associated with lower education, older age, Medicare/Medicaid, initial efavirenz, smoking, obesity, and neurocognitive impairment; physical activity and alcohol use were protective...
March 15, 2017: Journal of Infectious Diseases
https://www.readbyqxmd.com/read/28453717/reaching-the-global-target-to-reduce-stunting-an-investment-framework
#2
Meera Shekar, Jakub Kakietek, Mary R D'Alimonte, Hilary E Rogers, Julia Dayton Eberwein, Jon Kweku Akuoku, Audrey Pereira, Shan Soe-Lin, Robert Hecht
Childhood stunting, being short for one's age, has life-long consequences for health, human capital and economic growth. Being stunted in early childhood is associated with slower cognitive development, reduced schooling attainment and adult incomes decreased by 5-53%. The World Health Assembly has endorsed global nutrition targets including one to reduce the number of stunted children under five by 40% by 2025. The target has been included in the Sustainable Development Goals (SDG target 2.2). This paper estimates the cost of achieving this target and develops scenarios for generating the necessary financing...
June 1, 2017: Health Policy and Planning
https://www.readbyqxmd.com/read/28453525/high-mortality-among-male-hiv-infected-patients-after-prison-release-art-is-not-enough-after-incarceration-with-hiv
#3
Florence Huber, Alice Merceron, Yoann Madec, Gueda Gadio, Vincent About, Agathe Pastre, Isabelle Coupez, Antoine Adenis, Leila Adriouch, Mathieu Nacher
CONTEXT: French Guiana is a South American French territory, where HIV prevalence consistently exceeds 1% in the adult population. In the only correctional facility, HIV prevalence fluctuates at around 4%. AIMS: After describing the population of HIV-positive inmates, we aimed to evaluate mortality after release from the correctional facility, and to identify its predictive factors. RATIONALE: Outside North American settings, data on treatment outcome and vital status of HIV-positive former inmates are scarce...
2017: PloS One
https://www.readbyqxmd.com/read/28449111/migrant-women-living-with-hiv-in-europe-are-they-facing-inequalities-in-the-prevention-of-mother-to-child-transmission-of-hiv-the-european-pregnancy-and-paediatric-hiv-cohort-collaboration-eppicc-study-group-in-eurocoord
#4
G Favarato, H Bailey, F Burns, L Prieto, A Soriano-Arandes, C Thorne
In pregnancy early interventions are recommended for prevention of mother-to-child-transmission (PMTCT) of HIV. We examined whether pregnant women who live with HIV in Europe and are migrants encounter barriers in accessing HIV testing and care. Four cohorts within the European Pregnancy and Paediatric HIV Cohort Collaboration provided data for pooled analysis of 11 795 pregnant women who delivered in 2002-12 across ten European countries. We defined a migrant as a woman delivering in a country different from her country of birth and grouped the countries into seven world regions...
April 25, 2017: European Journal of Public Health
https://www.readbyqxmd.com/read/28449096/two-ribosome-recruitment-sites-direct-multiple-translation-events-within-hiv1-gag-open-reading-frame
#5
Jules Deforges, Sylvain de Breyne, Melissa Ameur, Nathalie Ulryck, Nathalie Chamond, Afaf Saadi, Yann Ponty, Theophile Ohlmann, Bruno Sargueil
In the late phase of the HIV virus cycle, the unspliced genomic RNA is exported to the cytoplasm for the necessary translation of the Gag and Gag-pol polyproteins. Three distinct translation initiation mechanisms ensuring Gag production have been described with little rationale for their multiplicity. The Gag-IRES has the singularity to be located within Gag ORF and to directly interact with ribosomal 40S. Aiming at elucidating the specificity and the relevance of this interaction, we probed HIV-1 Gag-IRES structure and developed an innovative integrative modelling strategy to take into account all the gathered information...
April 26, 2017: Nucleic Acids Research
https://www.readbyqxmd.com/read/28449059/marijuana-use-impacts-midlife-cardiovascular-events-in-hiv-infected-men
#6
David R Lorenz, Anupriya Dutta, Shibani S Mukerji, Alex Holman, Hajime Uno, Dana Gabuzda
Background.: Marijuana use is prevalent among persons infected with HIV, but its long-term effects on HIV disease progression and comorbidities are unknown. Methods.: A prospective study of 558 HIV-infected men enrolled in the Multicenter AIDS Cohort Study between 1990-2010: 182 HIV seroconverters and 376 with viral suppression on combination antiretroviral therapy (ART). Associations between heavy marijuana use and HIV disease markers or white blood cell (WBC) count were examined using mixed-effects and linear regression models...
April 25, 2017: Clinical Infectious Diseases: An Official Publication of the Infectious Diseases Society of America
https://www.readbyqxmd.com/read/28448903/violence-trauma-and-living-with-hiv-longitudinal-predictors-of-initiating-crystal-methamphetamine-injection-among-sex-workers
#7
Elena Argento, Steffanie A Strathdee, Shira Goldenberg, Melissa Braschel, Julio Montaner, Kate Shannon
BACKGROUND: Despite rapid increases in crystal methamphetamine (CM) use worldwide and established gendered patterns of use, empirical research on CM injection initiation among sex workers is limited. Given the wide range of harms associated with CM, alongside stimulant effects including sexual dis-inhibition and prolonged awake-ness, this study aimed to longitudinally investigate socio-structural predictors of initiating CM injection among sex workers in Vancouver, Canada. METHODS: Data (2010-2014) were drawn from a community-based cohort of women sex workers: AESHA (An Evaluation of Sex Workers Health Access)...
April 19, 2017: Drug and Alcohol Dependence
https://www.readbyqxmd.com/read/28448615/emphysema-is-associated-with-thoracic-vertebral-bone-attenuation-on-chest-ct-scan-in-hiv-infected-individuals
#8
Alycia Petraglia, Joseph K Leader, Matthew Gingo, Meghan Fitzpatrick, John Ries, Cathy Kessinger, Lorrie Lucht, Danielle Camp, Alison Morris, Jessica Bon
BACKGROUND: Age-related chronic diseases are prevalent in HIV-infected persons in the antiretroviral therapy (ART) era. Bone mineral density (BMD) loss and emphysema have separately been shown to occur at a younger age and with lesser risk exposure in HIV-infected compared to HIV-uninfected individuals. In non-HIV infected smokers, emphysema has been shown to independently predict low BMD. We hypothesized that emphysema would independently associate with thoracic vertebral bone attenuation, a surrogate for bone mineral density, in HIV-infected individuals...
2017: PloS One
https://www.readbyqxmd.com/read/28448574/fusion-expression-of-occludin-extracellular-loops-and-an-%C3%AE-helical-bundle-a-new-research-model-for-tight-junction
#9
Xiaojing Chi, Xia Zhao, Wei Wang, Yuqiang Niu, Min Cheng, Xiuying Liu, Sheng Cui, Wei Yang
Tight junctions (TJs) are the outermost structures of intercellular junctions and are highly specialized membrane domains involved in many important cellular processes. However, most TJ proteins are four-time transmembrane proteins and are difficult to express in their correct soluble form, which limits their functional study and therapeutic application. Human occludin (OCLN) is a major component of TJs and an essential co-receptor for hepatitis C virus (HCV) cell entry. To explore expression strategy for recombinant TJ proteins possessing integrated and functional extracellular loops, OCLN was here used as a model molecule, and several prokaryotic fusion constructs were designed by docking OCLN extracellular loops (ECLs) to HIV-1 gp41 NHR and CHR six-helical bundle (6HV1); then their biophysical features and anti-HCV activity were evaluated...
2017: PloS One
https://www.readbyqxmd.com/read/28446664/analysis-of-competing-hiv-1-splice-donor-sites-uncovers-a-tight-cluster-of-splicing-regulatory-elements-within-exon-2-2b
#10
Anna-Lena Brillen, Lara Walotka, Frank Hillebrand, Lisa Müller, Marek Widera, Stephan Theiss, Heiner Schaal
The HIV-1 accessory protein Vif is essential for viral replication by counteracting the host restriction factor APOBEC3G (A3G), and balanced levels of both proteins are required for efficient viral replication. Non-coding exons 2/2b contain the Vif start codon between their alternatively used splice donors 2 and 2b (D2 and D2b). For the vif mRNA, intron 1 must be removed, while intron 2 must be retained. Thus, splice acceptor 1 (A1) must be activated by U1 snRNP binding to either D2 or D2b, while splicing at D2 or D2b must be prevented...
April 26, 2017: Journal of Virology
https://www.readbyqxmd.com/read/28445881/absence-of-decline-of-kidney-function-in-human-immunodeficiency-virus-infected-patients-under-routine-clinical-management
#11
Julie Boucquemont, Sylvie Lawson-Ayayi, Claire Rigothier, Fabrice Bonnet, Cécile Proust-Lima, Didier Neau, Carine Greib, Ghada Miremont-Salamé, François Dabis, Michel Dupon, Frédéric-Antoine Dauchy
BACKGROUND: Since the introduction of antiretroviral therapy (ART), human immunodeficiency virus (HIV)-infected patients have a drastically improved prognosis but at the same time they are also more affected by non-HIV related complications, such as chronic kidney disease. The objective of our study was to investigate the effect of proteinuria and tenofovir (TDF)-containing ART regimens on the temporal evolution of estimated glomerular filtration rate (eGFR). METHODS: Between April 2008 and October 2012, we enrolled 395 patients with a complete renal evaluation among patients from the ANRS C03 Aquitaine cohort, a prospective hospital-based cohort of HIV-1-infected patients under routine clinical management in southwestern France...
April 26, 2017: Nephron
https://www.readbyqxmd.com/read/28445512/proportions-of-circulating-follicular-helper-t-cells-are-reduced-and-correlate-with-memory-b-cells-in-hiv-infected-children
#12
Daniel M Muema, Gladys N Macharia, Babatunde A Olusola, Amin S Hassan, Greg W Fegan, James A Berkley, Britta C Urban, Eunice W Nduati
INTRODUCTION: HIV causes defects in memory B cells in children, but the mechanisms of those defects have not been fully elucidated. One possible mechanism is the lack of T-cell help to B cells during immune reactions. However, few studies have assessed the effect of HIV on follicular helper T cells (TFH cells) in children. METHODS: In this study, follicular-homing CD4 T cells and memory B cells were assessed in HIV-infected children and compared with children from the community...
2017: PloS One
https://www.readbyqxmd.com/read/28444865/a-high-rate-of-hiv-1-acquisition-post-immigration-among-migrants-in-sweden-determined-by-a-cd4-t-cell-decline-trajectory-model
#13
J Brännström, A Sönnerborg, V Svedhem, U Neogi, G Marrone
OBJECTIVES: There is a lack of knowledge about the extent to which migrants become HIV-1 infected after arrival in European countries. The objective of this study was to assess the extent to which migrants to Sweden become HIV-1 infected post immigration using a CD4 T-cell decline trajectory model. METHODS: All migrants (n = 2268) who were ≥ 15 years old, were diagnosed with HIV-1 infection in the period 1983-2013, had a known year of arrival in Sweden, did not have primary HIV infection and were not infected via mother-to-child transmission were included in the study...
April 26, 2017: HIV Medicine
https://www.readbyqxmd.com/read/28444859/roles-of-samhd1-in-antiviral-defense-autoimmunity-and-cancer
#14
REVIEW
Miaomiao Li, Dong Zhang, Mengying Zhu, Yuxian Shen, Wei Wei, Songcheng Ying, Heinrich Korner, Jun Li
The enzyme, sterile α motif and histidine-aspartic acid domain-containing protein 1 (SAMHD1) diminishes infection of human immunodeficiency virus type 1 (HIV-1) by hydrolyzing intracellular deoxynucleotide triphosphates (dNTPs) in myeloid cells and resting CD4+ T cells. This dNTP degradation reduces the dNTP concentration to a level insufficient for viral cDNA synthesis, thereby inhibiting retroviral replication. This antiviral enzymatic activity can be inhibited by viral protein X (Vpx). The HIV-2/SIV Vpx causes degradation of SAMHD1, thus interfering with the SAMHD1-mediated restriction of retroviral replication...
April 25, 2017: Reviews in Medical Virology
https://www.readbyqxmd.com/read/28444818/reduced-community-viral-load-does-not-coincide-with-a-reduction-in-the-rate-of-new-hiv-diagnoses-and-recent-infections-data-from-a-region-of-southern-italy
#15
L Monno, A Saracino, L Scudeller, C Santoro, G Brindicci, G Punzi, A Lagioia, S Lo Caputo, G Angarano
OBJECTIVES: We assessed whether changes in community viral load (CVL) over time were associated with the rate of new HIV diagnoses (NDs). METHODS: HIV-1-positive individuals referred to our institute and permanently residing in our province were considered for inclusion in the study. A total of 861 HIV-infected adults with at least one HIV RNA measurement (12 530 measurements in total) between 2008 and 2014 were included. Viraemia copy-years were calculated from all HIV RNA values for each patient using the trapezoidal rule; multiple CVL indicators were considered...
April 26, 2017: HIV Medicine
https://www.readbyqxmd.com/read/28444469/modelling-the-unaids-90-90-90-treatment-cascade-for-gay-bisexual-and-other-men-who-have-sex-with-men-in-south-africa-using-the-findings-of-a-data-triangulation-process-to-map-a-way-forward
#16
Andrew Scheibe, Michael Grasso, Henry Fisher Raymond, Albert Manyuchi, Thomas Osmand, Tim Lane, Helen Struthers
A data triangulation exercise was carried out between 2013 and 2015 to assess the HIV epidemic and response among gay, bisexual and other men who have sex with men (GBMSM) in South Africa. We used the findings to assess progress in achieving the UNAIDS 90-90-90 goals for GBMSM in the country. Three scenarios were developed using different GBMSM population factors (2.0, 3.5 and 5.0% of males aged ≥15) to estimate the population size, HIV prevalence of 13.2-49.5%, and 68% of GBMSM knowing their status. Due to data gaps, general population data were used as estimates of GBMSM on antiretroviral therapy (ART) and virologically suppressed (25...
April 25, 2017: AIDS and Behavior
https://www.readbyqxmd.com/read/28444232/co-trimoxazole-prophylaxis-asymptomatic-malaria-parasitemia-and-infectious-morbidity-in-hiv-exposed-uninfected-infants-in-malawi-the-ban-study
#17
Nicole L Davis, Jeffrey Wiener, Jonathan J Juliano, Linda Adair, Charles S Chasela, Dumbani Kayira, Michael G Hudgens, Charles van der Horst, Denise J Jamieson, Athena P Kourtis
Background: HIV-exposed infants are disproportionately at risk of morbidity and mortality compared with their HIV-unexposed counterparts. The role of co-trimoxazole preventive therapy (CPT) in reducing leading causes of infectious morbidity is unclear. Methods: We used data from the Breastfeeding, Antiretrovirals and Nutrition (BAN) clinical trial (conducted 2004-2010, Malawi) to assess the association of 1) CPT and 2) asymptomatic malaria parasitemia with respiratory and diarrheal morbidity in infants...
April 21, 2017: Clinical Infectious Diseases: An Official Publication of the Infectious Diseases Society of America
https://www.readbyqxmd.com/read/28444057/determinant-factors-of-knowledge-attitudes-and-practices-regarding-std-aids-and-viral-hepatitis-among-youths-aged-18-to-29-years-in-brazil
#18
Miguel Barbosa Fontes, Rodrigo Campos Crivelaro, Alice Margini Scartezini, David Duarte Lima, Alexandre de Araújo Garcia, Rafael Tsuyoshi Fujioka
The scope of this study was to evaluate the vulnerability of Brazilian youths to STDs/HIV&AIDS and Viral Hepatitis. Interviews were conducted with 1,208 youths aged 18 to 29 in 15 states and the Federal District. The regional and national adjusted margin of error of the research was 2.8%. The study was approved by the School of Medicine of Brasilia University with support from PAHO and the Ministry of Health. A scale with 35 questions (knowledge, attitudes and practices) was the main dependent variable. Adjusted linear regression models identified the demographic and social determinant factors that explain scale variations...
April 2017: Ciência & Saúde Coletiva
https://www.readbyqxmd.com/read/28443678/outcomes-along-the-hiv-care-continuum-among-undocumented-immigrants-in-clinical-care
#19
Jonathan Ross, Uriel R Felsen, Chinazo O Cunningham, Viraj V Patel, David B Hanna
HIV-infected undocumented immigrants face unique barriers to care yet little is known about their clinical outcomes. We performed a retrospective cohort study of HIV-infected adults in clinical care from 2006-2014 at a large academic medical center in a setting where medical insurance is available to HIV-infected undocumented immigrants. Undocumented status was assessed based on Social Security number and insurance status and verified through medical chart review. Using Poisson regression models, we compared undocumented and documented patients with respect to retention in care (≥ 2 HIV-related lab tests ≥ 90 days apart), antiretroviral therapy (ART) prescription (≥ 3 active antiretroviral agents prescribed in a year) and viral suppression (HIV RNA <200 copies/ml for the last measured viral load) for each year in care...
April 26, 2017: AIDS Research and Human Retroviruses
https://www.readbyqxmd.com/read/28442603/aspergillus-fumigatus-trehalose-regulatory-subunit-homolog-moonlights-to-mediate-cell-wall-homeostasis-through-modulation-of-chitin-synthase-activity
#20
Arsa Thammahong, Alayna K Caffrey-Card, Sourabh Dhingra, Joshua J Obar, Robert A Cramer
Trehalose biosynthesis is found in fungi but not humans. Proteins involved in trehalose biosynthesis are essential for fungal pathogen virulence in humans and plants through multiple mechanisms. Loss of canonical trehalose biosynthesis genes in the human pathogen Aspergillus fumigatus significantly alters cell wall structure and integrity, though the mechanistic link between these virulence-associated pathways remains enigmatic. Here we characterize genes, called tslA and tslB, which encode proteins that contain domains similar to those corresponding to trehalose-6-phosphate phosphatase but lack critical catalytic residues for phosphatase activity...
April 25, 2017: MBio
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