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HIV Modeling

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https://www.readbyqxmd.com/read/28550378/longitudinal-modeling-of-depressive-trajectories-among-hiv-infected-men-using-cocaine
#1
Shibani Mukerji, Roxanna Haghighat, Vikas Misra, David R Lorenz, Alex Holman, Anupriya Dutta, Dana Gabuzda
Cocaine use is prevalent among HIV-infected individuals. While cross-sectional studies suggest that cocaine users may be at increased risk for depression, long-term effects of cocaine on depressive symptoms remain unclear. This is a longitudinal study of 341 HIV-infected and uninfected men (135 cocaine users and 206 controls) ages 30-60 enrolled in the Multicenter AIDS Cohort Study during 1996-2009. The median baseline age was 41; 73% were African-American. In mixed-effects models over a median of 4.8 years of observation, cocaine use was associated with higher depressive symptoms independent of age, education level, and smoking (n = 288; p = 0...
May 26, 2017: AIDS and Behavior
https://www.readbyqxmd.com/read/28550375/exploring-inductive-linearization-for-pharmacokinetic-pharmacodynamic-systems-of-nonlinear-ordinary-differential-equations
#2
Chihiro Hasegawa, Stephen B Duffull
Pharmacokinetic-pharmacodynamic systems are often expressed with nonlinear ordinary differential equations (ODEs). While there are numerous methods to solve such ODEs these methods generally rely on time-stepping solutions (e.g. Runge-Kutta) which need to be matched to the characteristics of the problem at hand. The primary aim of this study was to explore the performance of an inductive approximation which iteratively converts nonlinear ODEs to linear time-varying systems which can then be solved algebraically or numerically...
May 26, 2017: Journal of Pharmacokinetics and Pharmacodynamics
https://www.readbyqxmd.com/read/28548638/asymmetric-recognition-of-hiv-1-envelope-trimer-by-v1v2-loop-targeting-antibodies
#3
Haoqing Wang, Harry B Gristick, Louise Scharf, Anthony P West, Rachel P Galimidi, Michael S Seaman, Natalia T Freund, Michel C Nussenzweig, Pamela J Bjorkman
The HIV-1 envelope (Env) glycoprotein binds to host cell receptors to mediate membrane fusion. The prefusion Env trimer is stabilized by V1V2 loops that interact at the trimer apex. Broadly neutralizing antibodies (bNAbs) against V1V2 loops, exemplified by PG9, bind asymmetrically as a single Fab to the apex of the symmetric Env trimer using a protruding CDRH3 to penetrate the Env glycan shield. Here we characterized a distinct mode of V1V2 epitope recognition by the new bNAb BG1 in which two Fabs bind asymmetrically per Env trimer using a compact CDRH3...
May 26, 2017: ELife
https://www.readbyqxmd.com/read/28545882/emerging-infectious-diseases-and-blood-safety-modeling-the-transfusion-transmission-risk
#4
REVIEW
Philip Kiely, Manoj Gambhir, Allen C Cheng, Zoe K McQuilten, Clive R Seed, Erica M Wood
While the transfusion-transmission (TT) risk associated with the major transfusion-relevant viruses such as HIV is now very low, during the last 20 years there has been a growing awareness of the threat to blood safety from emerging infectious diseases, a number of which are known to be, or are potentially, transfusion transmissible. Two published models for estimating the transfusion-transmission risk from EIDs, referred to as the Biggerstaff-Petersen model and the European Upfront Risk Assessment Tool (EUFRAT), respectively, have been applied to several EIDs in outbreak situations...
May 15, 2017: Transfusion Medicine Reviews
https://www.readbyqxmd.com/read/28544500/non-communicable-diseases-and-hiv-care-and-treatment-models-of-integrated-service-delivery
#5
REVIEW
Malia Duffy, Bisola Ojikutu, Soa Andrian, Elaine Sohng, Thomas Minior, Lisa R Hirschhorn
OBJECTIVES: Non-communicable diseases (NCD) are a growing cause of morbidity in low-income countries including in people living with Human Immunodeficiency Virus (HIV). Integration of NCD and HIV services can build upon experience with chronic care models from HIV programs. We describe models of NCD and HIV integration, challenges, and lessons learned. METHODS: Literature review of articles on integrated NCD and HIV programs in low-income countries and key informant interviews with leaders of identified integrated NCD and HIV programs...
May 24, 2017: Tropical Medicine & International Health: TM & IH
https://www.readbyqxmd.com/read/28544070/the-importance-of-assessing-out-of-pocket-payments-when-the-financing-of-antiretroviral-therapy-is-transitioned-to-domestic-funding-findings-from-vietnam
#6
Benjamin Johns, Le Bao Chau, Kieu Huu Hanh, Nguyen Thuy Huong, Hoa Mai Do, Anh Thuy Duong, Long Hoang Nguyen
OBJECTIVE: To assess out-of-pocket payments and catastrophic health expenditures among antiretroviral therapy (ART) patients in Vietnam, and to model catastrophic payments under different copayment scenarios when the primary financing of ART changes to social health insurance. METHODS: Cross-sectional facility-based survey of 843 patients at 42 health facilities representative of 87% of ART patients in 2015. RESULTS: Because of donor and government funding, no payments were made for antiretroviral drugs...
May 19, 2017: Tropical Medicine & International Health: TM & IH
https://www.readbyqxmd.com/read/28543215/fib-4-stage-of-liver-fibrosis-predicts-incident-heart-failure-among-hiv-infected-and-uninfected-patients
#7
Kaku A So-Armah, Joseph K Lim, Vincent Lo Re, Janet P Tate, H Chang Chung-Chou, Adeel A Butt, Cynthia L Gibert, David Rimland, Vincent C Marconi, Matthew B Goetz, Maria C Rodriguez-Barradas, Michael E DeBakey, Matthew J Budoff, Hilary A Tindle, Jeffrey H Samet, Amy C Justice, Matthew S Freiberg
Liver fibrosis is common, particularly in human immunodeficiency virus infected (HIV+) people. HIV+ people have excess congestive heart failure (CHF) risk compared to uninfected people. It remains unknown if stage of liver fibrosis influences the CHF risk or if HIV or hepatitis C virus (HCV) infection modifies this association. Our objectives were to assess whether: 1) stage of liver fibrosis is independently associated with incident CHF; 2) the association between stage of liver fibrosis and incident CHF is modified by HIV/HCV status...
May 24, 2017: Hepatology: Official Journal of the American Association for the Study of Liver Diseases
https://www.readbyqxmd.com/read/28542587/seminal-plasma-induces-inflammation-and-enhances-hiv-1-replication-in-human-cervical-tissue-explants
#8
Andrea Introini, Stéphanie Boström, Frideborg Bradley, Anna Gibbs, Axel Glaessgen, Annelie Tjernlund, Kristina Broliden
The most immediate and evident effect of mucosal exposure to semen in vivo is a local release of proinflammatory mediators accompanied by an influx of leukocytes into the female genital mucosa (FGM). The implication of such response in HIV-1 transmission has never been addressed due to limitations of currently available experimental models. Using human tissue explants from the uterine cervix, we developed a system of mucosal exposure to seminal plasma (SP) that supports HIV-1 replication. Treatment of ectocervical explants with SP resulted in the upregulation of inflammatory and growth factors, including IL-6, TNF, CCL5, CCL20, CXCL1, and CXCL8, and IL1A, CSF2, IL7, PTGS2, as evaluated by measuring protein levels in explant conditioned medium (ECM) and gene expression in tissue...
May 19, 2017: PLoS Pathogens
https://www.readbyqxmd.com/read/28542441/dot-or-sat-for-rifampicin-resistant-tuberculosis-a-non-randomized-comparison-in-a-high-hiv-prevalence-setting
#9
Erika Mohr, Johnny Daniels, Busisiwe Beko, Petros Isaakidis, Vivian Cox, Sarah Jane Steele, Odelia Muller, Leigh Snyman, Virginia De Azevedo, Amir Shroufi, Laura Trivino Duran, Jennifer Hughes
BACKGROUND: Daily directly-observed therapy (DOT) is recommended for rifampicin-resistant tuberculosis (RR-TB) patients throughout treatment. We assessed the impact of self-administered treatment (SAT) in a South African township with high rates of RR-TB and HIV. METHODS: Community-supported SAT for patients who completed the intensive phase was piloted in five primary care clinics in Khayelitsha. We compared final treatment outcomes among RR-TB patients initiating treatment before (standard-of-care (SOC)-cohort, January 2010-July 2013) and after the implementation of the pilot (SAT-cohort, January 2012-December 2014)...
2017: PloS One
https://www.readbyqxmd.com/read/28542260/hookworm-infection-is-associated-with-decreased-cd4-t-cell-counts-in-hiv-infected-adult-ugandans
#10
Bozena M Morawski, Miya Yunus, Emmanuel Kerukadho, Grace Turyasingura, Logose Barbra, Andrew Mijumbi Ojok, Andrew DiNardo, Stefanie Sowinski, David R Boulware, Rojelio Mejia
Most studies evaluating epidemiologic relationships between helminths and HIV have been conducted in the pre-ART era, and evidence of the impact of helminth infections on HIV disease progression remains conflicting. Less is known about helminth infection and clinical outcomes in HIV-infected adults receiving antiretroviral therapy (ART). We sampled HIV-infected adults for eight gastrointestinal parasites and correlated parasitic infection with demographic predictors, and clinical and immunologic outcomes. Contrasting with previous studies, we measured parasitic infection with a quantitative, highly sensitive and specific polymerase chain reaction (PCR) method...
May 25, 2017: PLoS Neglected Tropical Diseases
https://www.readbyqxmd.com/read/28542184/estimation-of-the-cost-effectiveness-of-hiv-prevention-portfolios-for-people-who-inject-drugs-in-the-united-states-a-model-based-analysis
#11
Cora L Bernard, Douglas K Owens, Jeremy D Goldhaber-Fiebert, Margaret L Brandeau
BACKGROUND: The risks of HIV transmission associated with the opioid epidemic make cost-effective programs for people who inject drugs (PWID) a public health priority. Some of these programs have benefits beyond prevention of HIV-a critical consideration given that injection drug use is increasing across most United States demographic groups. To identify high-value HIV prevention program portfolios for US PWID, we consider combinations of four interventions with demonstrated efficacy: opioid agonist therapy (OAT), needle and syringe programs (NSPs), HIV testing and treatment (Test & Treat), and oral HIV pre-exposure prophylaxis (PrEP)...
May 2017: PLoS Medicine
https://www.readbyqxmd.com/read/28542081/dapivirine-vaginal-ring-use-does-not-diminish-the-effectiveness-of-hormonal-contraception
#12
Jennifer E Balkus, Thesla Palanee-Phillips, Krishnaveni Reddy, Samantha Siva, Ishana Harkoo, Clemensia Nakabiito, Kenneth Kintu, Gonasangrie Nair, Catherine Chappell, Flavia Matovu Kiweewa, Samuel Kabwigu, Logashvari Naidoo, Nitesha Jeenarain, Mark Marzinke, Lydia Soto-Torres, Elizabeth R Brown, Jared M Baeten
OBJECTIVE: To evaluate the potential for a clinically relevant drug-drug interaction with concomitant use of a dapivirine vaginal ring, a novel antiretroviral-based HIV-1 prevention strategy, and hormonal contraception by examining contraceptive efficacies with and without dapivirine ring use. DESIGN: A secondary analysis of women participating in MTN-020/ASPIRE, a randomized, double-blind, placebo-controlled trial of the dapivirine vaginal ring for HIV-1 prevention...
May 23, 2017: Journal of Acquired Immune Deficiency Syndromes: JAIDS
https://www.readbyqxmd.com/read/28540563/offering-self-administered-oral-hiv-testing-as-a-choice-to-truck-drivers-in-kenya-predictors-of-uptake-and-need-for-guidance-while-self-testing
#13
Elizabeth A Kelvin, Gavin George, Eva Mwai, Eston N Nyaga, Joanne E Mantell, Matthew L Romo, Jacob O Odhiambo, Kaymarlin Govender
We assessed predictors of choosing self-administered oral HIV testing in the clinic with supervision versus the standard provider-administered blood test when offered the choice among 149 Kenyan truck drivers, described the types of guidance participants needed during self-testing and predictors of needing guidance. Overall, 56.38% of participants chose the self-test, 23.49% the provider-administered test, and 20.13% refused testing. In the adjusted regression models, each additional unit on the fatalism and self-efficacy scales was associated with 0...
May 24, 2017: AIDS and Behavior
https://www.readbyqxmd.com/read/28539614/the-ccr5-antagonist-maraviroc-reverses-hiv-1-latency-in-vitro-alone-or-in-combination-with-the-pkc-agonist-bryostatin-1
#14
María Rosa López-Huertas, Laura Jiménez-Tormo, Nadia Madrid-Elena, Carolina Gutiérrez, Sara Rodríguez-Mora, Mayte Coiras, José Alcamí, Santiago Moreno
A potential strategy to cure HIV-1 infection is to use latency reversing agents (LRAs) to eliminate latent reservoirs established in resting CD4+ T (rCD4+) cells. As no drug has been shown to be completely effective, finding new drugs and combinations are of increasing importance. We studied the effect of Maraviroc (MVC), a CCR5 antagonist that activates NF-κB, on HIV-1 replication from latency. HIV-1-latency models based on CCL19 or IL7 treatment, before HIV-1 infection were used. Latently infected primary rCD4+ or central memory T cells were stimulated with MVC alone or in combination with Bryostatin-1, a PKC agonist known to reverse HIV-1 latency...
May 24, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28539451/reducing-v3-antigenicity-and-immunogenicity-on-soluble-native-like-hiv-1-env-sosip-trimers
#15
Rajesh P Ringe, Gabriel Ozorowski, Kimmo Rantalainen, Weston B Struwe, Katie Matthews, Jonathan L Torres, Anila Yasmeen, Christopher A Cottrell, Thomas J Ketas, Celia C LaBranche, David C Montefiori, Albert Cupo, Max Crispin, Ian A Wilson, Andrew B Ward, Rogier W Sanders, P J Klasse, John P Moore
Native-like trimers of the SOSIP design are being developed as immunogens in human immunodeficiency virus type 1 (HIV-1) vaccine development programs. These trimers display the epitopes for multiple broadly neutralizing antibodies (bNAbs), but can also expose binding sites for some types of non-neutralizing antibodies (non-NAbs). Among the latter are epitopes in the gp120 V3 region that are highly immunogenic when SOSIP trimers are evaluated in animal models. It is presently uncertain whether antibodies against V3 can interfere with the induction of NAbs, but there are good arguments in favor of suppressing such "off-target" immune responses...
May 24, 2017: Journal of Virology
https://www.readbyqxmd.com/read/28538691/the-potential-cost-effectiveness-of-pre-exposure-prophylaxis-combined-with-hiv-vaccines-in-the-united-states
#16
Blythe J S Adamson, Josh J Carlson, James G Kublin, Louis P Garrison
This economic evaluation aims to support policy-making on the combined use of pre-exposure prophylaxis (PrEP) with HIV vaccines in development by evaluating the potential cost-effectiveness of implementation that would support the design of clinical trials for the assessment of combined product safety and efficacy. The target study population is a cohort of men who have sex with men (MSM) in the United States. Policy strategies considered include standard HIV prevention, daily oral PrEP, HIV vaccine, and their combination...
May 24, 2017: Vaccines
https://www.readbyqxmd.com/read/28538165/the-complexity-in-herpesvirus-entry
#17
REVIEW
Karthik Sathiyamoorthy, Jia Chen, Richard Longnecker, Theodore S Jardetzky
Enveloped viruses have evolved diverse transmembrane proteins and protein complexes to enable host cell entry by regulating and activating membrane fusion in a target cell-specific manner. In general terms, the entry process requires a receptor binding step, an activation step and a membrane fusion step, which can be encoded within a single viral protein or distributed among multiple viral proteins. HIV and influenza virus, for example, encode all of these functions in a single trimeric glycoprotein, HIV env or influenza virus hemagglutinin (HA)...
May 21, 2017: Current Opinion in Virology
https://www.readbyqxmd.com/read/28537936/zidovudine-use-in-pregnancy-and-congenital-malformations-meta-analysis-and-bayesian-incorporation-of-medicaid-data
#18
Kathryn Rough, Jenny W Sun, George R Seage, Paige L Williams, Krista F Huybrechts, Brian T Bateman, Sonia Hernandez-Diaz
OBJECTIVE: There is inconsistent evidence that zidovudine use during pregnancy increases overall, cardiac, and male genital malformations. DESIGN: We conducted a systematic review and meta-analysis of zidovudine use and malformations and, using Bayesian methods, combined it with data from a cohort study of mother-infant pairs in the nationwide Medicaid Analytic eXtract (MAX). METHODS: Using MAX data (2000-2010), we identified pregnant women with HIV treated with antiretroviral therapy (ART)...
May 23, 2017: AIDS
https://www.readbyqxmd.com/read/28536303/implementing-a-fee-for-service-cervical-cancer-screening-and-treatment-program-in-cameroon-challenges-and-opportunities
#19
Geneva DeGregorio, Simon Manga, Edith Kiyang, Florence Manjuh, Leslie Bradford, Preetam Cholli, Richard Wamai, Rebecca Ogembo, Zacharie Sando, Yuxin Liu, Lisa Kennedy Sheldon, Kathleen Nulah, Thomas Welty, Edith Welty, Javier Gordon Ogembo
BACKGROUND: Cervical cancer screening is one of the most effective cancer prevention strategies, but most women in Africa have never been screened. In 2007, the Cameroon Baptist Convention Health Services, a large faith-based health care system in Cameroon, initiated the Women's Health Program (WHP) to address this disparity. The WHP provides fee-for-service cervical cancer screening using visual inspection with acetic acid enhanced by digital cervicography (VIA-DC), prioritizing care for women living with HIV/AIDS...
May 23, 2017: Oncologist
https://www.readbyqxmd.com/read/28536104/development-and-validation-of-qrisk3-risk-prediction-algorithms-to-estimate-future-risk-of-cardiovascular-disease-prospective-cohort-study
#20
Julia Hippisley-Cox, Carol Coupland, Peter Brindle
Objectives To develop and validate updated QRISK3 prediction algorithms to estimate the 10 year risk of cardiovascular disease in women and men accounting for potential new risk factors.Design Prospective open cohort study.Setting General practices in England providing data for the QResearch database.Participants 1309 QResearch general practices in England: 981 practices were used to develop the scores and a separate set of 328 practices were used to validate the scores. 7.89 million patients aged 25-84 years were in the derivation cohort and 2...
May 23, 2017: BMJ: British Medical Journal
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