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HIV Modeling

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https://www.readbyqxmd.com/read/29342239/hplc-estimation-ex-vivo-everted-sac-permeability-and-in-vivo-pharmacokinetic-studies-of-darunavir
#1
Vasanti M Suvarna, Preeti C Sangave
Darunavir ethanolate (DRV) is an efficient protease inhibitor (PI) used in the treatment of human immunodeficiency virus (HIV) type-1 patients. An isocratic reversed-phase HPLC method was developed to monitor concentration of darunavir in in vitro intestinal fluid samples in everted sac absorption model in the presence of bioenhancers, viz., piperine, quercetin, naringenin. The method was validated and successfully applied to everted sac and pharmacokinetic studies in rats. The absorption profiles of DRV and apparent permeability coefficients were determined...
January 12, 2018: Journal of Chromatographic Science
https://www.readbyqxmd.com/read/29342172/driving-factors-of-retention-in-care-among-hiv-positive-msm-and-transwomen-in-indonesia-a-cross-sectional-study
#2
Adi Nugroho, Vicki Erasmus, Robert W S Coulter, Sushil Koirala, Oranuch Nampaisan, Wirastra Pamungkas, Jan Hendrik Richardus
Little is known about the prevalence of and factors that influence retention in HIV-related care among Indonesian men who have sex with men (MSM) and transgender women (transwomen, or waria in Indonesian term). Therefore, we explored the driving factors of retention in care among HIV-positive MSM and waria in Indonesia. This cross-sectional study involved 298 self-reported HIV-positive MSM (n = 165) and waria (n = 133). Participants were recruited using targeted sampling and interviewed using a structured questionnaire...
2018: PloS One
https://www.readbyqxmd.com/read/29340914/structural-effects-on-hiv-risk-among-youth-a-multi-level-analysis
#3
Robin Lin Miller, Trevor Strzyzykowski, Kyung-Sook Lee, Danielle Chiaramonte, Ignacio Acevedo-Polakovich, Hannah Spring, Olga Santiago-Rivera, Cherrie B Boyer, Jonathan M Ellen
We proposed a multilevel model of structural influences on HIV-risky sexual partnerships in a diverse sample of 1793 youth residing in 23 states and the District of Columbia. We examined the influence of concentrated disadvantage, HIV stigma, and sexual and gender minority stigma on engagement in HIV risky sexual partnerships and whether youth's participation in opportunity structures, anticipation of HIV stigma, and perceptions of their community as youth-supportive settings mediated structural effects. After controlling for age, HIV status, and race, we found structural HIV stigma had deleterious indirect effects on youth's participation in HIV-risky sexual partnerships...
January 16, 2018: AIDS and Behavior
https://www.readbyqxmd.com/read/29338889/situational-hiv-stigma-and-stimulant-use-a-day-level-autoregressive-cross-lagged-path-model-among-hiv-positive-gay-and-bisexual-men
#4
H Jonathon Rendina, Brett M Millar, Jeffrey T Parsons
BACKGROUND: Data on the association between HIV stigma and drug use are scarce, but some research suggests that internalized HIV stigma may be associated with increased drug use and that this association may be at least partially mediated by emotion dysregulation. We sought to test this hypothesis with event-level data to more accurately tease out the co-occurrence of these phenomena. METHODS: We conducted a 21-day, twice-daily ecological momentary assessment study with a sample of 52 HIV-positive gay and bisexual men...
January 3, 2018: Addictive Behaviors
https://www.readbyqxmd.com/read/29338805/risk-factors-for-infectiousness-of-patients-with-tuberculosis-a-systematic-review-and-meta-analysis
#5
Y A Melsew, T N Doan, M Gambhir, A C Cheng, E McBryde, J M Trauer
We performed a systematic review and meta-analyses of studies assessing tuberculosis (TB) patient-related risk factors for transmission of Mycobacterium tuberculosis infection. Meta-analyses were conducted for sputum smear-positivity, lung cavitation and HIV seropositivity of index patients with both crude and adjusted odds ratios (AORs) pooled using random effect models. Thirty-seven studies were included in the review. We found that demographic characteristics such as age and sex were not significant risk factors, while behaviours such as smoking and alcohol intake were associated with infectiousness although inconsistently...
January 17, 2018: Epidemiology and Infection
https://www.readbyqxmd.com/read/29338735/mental-health-service-utilization-is-associated-with-retention-in-care-among-persons-living-with-hiv-at-a-university-affiliated-hiv-clinic
#6
Lauren A Saag, Ashutosh R Tamhane, D Scott Batey, Michael J Mugavero, Ellen F Eaton
BACKGROUND: Mental health (MH) comorbidities reduce retention in care for persons living with HIV (PLWH) and are associated with poor health outcomes. Optimizing retention in primary care is vital, as poor retention is associated with delayed receipt of antiretroviral (ARV) therapy, ARV non-adherence, and poor health outcomes, including failure to suppress viral load, decreased CD4 counts, and clinically significant ARV drug resistance. We hypothesized that MH service utilization would be associated with improved retention in care for patients with HIV and MH comorbidities...
January 16, 2018: AIDS Research and Therapy
https://www.readbyqxmd.com/read/29338660/social-ecological-factors-associated-with-selling-sex-among-men-who-have-sex-with-men-in-jamaica-results-from-a-cross-sectional-tablet-based-survey
#7
Carmen H Logie, Ashley Lacombe-Duncan, Kathleen S Kenny, Kandasi Levermore, Nicolette Jones, Stefan D Baral, Ying Wang, Annecka Marshall, Peter A Newman
BACKGROUND: Globally, men who have sex with men (MSM) experience social marginalization and criminalization that increase HIV vulnerability by constraining access to HIV prevention and care. People who sell sex also experience criminalization, rights violations, and violence, which elevate HIV exposure. MSM who sell sex may experience intersectional stigma and intensified social marginalization, yet have largely been overlooked in epidemiological and social HIV research. In Jamaica, where same sex practices and sex work are criminalized, scant research has investigated sex selling among MSM, including associations with HIV vulnerability...
2018: Global Health Action
https://www.readbyqxmd.com/read/29338056/context-dependent-autoprocessing-of-human-immunodeficiency-virus-type-1-protease-precursors
#8
ChihFeng Tien, Liangqun Huang, Susan M Watanabe, Jordan T Speidel, Carol A Carter, Chaoping Chen
HIV-1 protease autoprocessing is responsible for liberation of free mature protease (PR) from the Gag-Pol polyprotein precursor. A cell-based model system was previously developed to examine the autoprocessing mechanism of fusion precursors carrying the p6*-PR miniprecursor sandwiched between various proteins or epitopes. We here report that precursor autoprocessing is context-dependent as its activity and outcomes can be modulated by sequences upstream of p6*-PR. This was exemplified by the 26aa maltose binding protein (MBP) signal peptide (SigP) when placed at the N-terminus of a fusion precursor...
2018: PloS One
https://www.readbyqxmd.com/read/29337847/hiv-care-continuum-disparities-among-bisexual-black-men-and-the-mediating-effect-of-psychosocial-co-morbidities
#9
M Reuel Friedman, Jordan M Sang, Leigh A Bukowski, Derrick D Matthews, Lisa A Eaton, H Fisher Raymond, Ron Stall
INTRODUCTION: Differences across the HIV care continuum between men who have sex with men and women (MSMW) and men who have sex with men only (MSMO) are emerging in recent literature but have not been comprehensively documented among Black MSM. Although MSMW have lower HIV prevalence than MSMO, they are more likely to be HIV-positive unaware and be virally unsuppressed. Explanatory factors for these differences have not previously been assessed. METHODS: Between 2014-2016, we surveyed sexually active Black MSM ≥18 years old at Black Gay Pride events in six U...
January 15, 2018: Journal of Acquired Immune Deficiency Syndromes: JAIDS
https://www.readbyqxmd.com/read/29337418/specific-non-covalent-interactions-determine-optimal-structure-of-a-buried-ligand-moiety-qm-mm-and-pure-qm-modeling-of-complexes-of-the-small-molecule-cd4-mimetics-and-hiv1-gp120
#10
Francesca Moraca, David Rinaldo, Amos Brittain Smith, Cameron Abrams
The small molecule CD4 mimetics (smCD4mc) are a class of highly potent HIV-1 entry inhibitors characterized by a unique SAR. They share a halogenated phenyl ring (region 1) that deeply inserts into an otherwise water-filled cavity at the CD4 binding site on the gp120 surface, so-called F43 cavity. Conservative modifications to region 1 away from this halogenated phenyl motif have all lead to loss of activity, despite they are predicted to bind equally well via standard empirical computational approaches making difficult to further optimize this region of the compounds to increase binding to gp120...
January 16, 2018: ChemMedChem
https://www.readbyqxmd.com/read/29336695/-ghosts-from-the-past-the-re-emergence-of-internalised-religious-stigma-following-diagnosis-of-hiv-among-northern-irish-gay-men
#11
Keith Kerrigan, Gill Green
This paper explores how previous exposure to religious homo-negativity features in the sense making process following HIV diagnosis in a homogenous sample of six gay men living in Northern Ireland. Interpretive Phenomenological Analysis was used to identify two key overarching themes: 'Negotiating authenticity in unsafe space' which relates to the experience of negotiating same sex attraction within religious environments and 'Re-emergence of religious shame in diagnosis' which relates to the way in which the men made sense of diagnosis from the position of having been exposed to religious homo-negativity earlier in their lives...
January 16, 2018: Journal of Homosexuality
https://www.readbyqxmd.com/read/29336596/hiv-related-thought-avoidance-sexual-risk-and-alcohol-use-among-men-who-have-sex-with-men
#12
Ashley E Pérez, Tyler B Wray, Mark A Celio, Peter M Monti
HIV-related "cognitive escape" refers to a tendency to avoid thoughts associated with HIV, which may be particularly common among men who have sex with men (MSM) who are often inundated with HIV information, potentially to the point of fatigue. HIV-related cognitive escape is associated with increased sexual risk behaviors, such as condomless sex, and heavier alcohol use patterns. Other studies show that some MSM may use alcohol specifically to facilitate sex. These sexual motives for drinking (SMDs) could be one mechanism whereby cognitive escape leads to health risk behaviors...
January 16, 2018: AIDS Care
https://www.readbyqxmd.com/read/29336497/effects-of-treatment-with-maraviroc-a-ccr5-inhibitor-on-a-human-hepatic-stellate-cell-line
#13
N Coppola, A Perna, A Lucariello, S Martini, M Macera, M A Carleo, G Guerra, V Esposito, A De Luca
After an acute liver damage, tissue regeneration repairs lesions with degradation of deposed fibrotic material, while mechanisms of tissue restoration are persistently activated following several repeated injuries, inducing deposition of extracellular matrix. (ECM). Factors responsible for ECM remodeling have been identified in a pathway involving a family of zinc-dependent enzyme matrix metalloproteinases (MMPs), together with tissue inhibitor of metalloproteinases (TIMPs). Recent experimental models suggested a role of CCR5 receptor in the genesis of liver fibrosis...
January 16, 2018: Journal of Cellular Physiology
https://www.readbyqxmd.com/read/29335895/pharmacokinetics-antiviral-activity-and-safety-of-rilpivirine-in-pregnant-women-with-hiv-1-infection-results-of-a-phase-3b-multicenter-open-label-study
#14
Olayemi Osiyemi, Salih Yasin, Carmen Zorrilla, Ceyhun Bicer, Vera Hillewaert, Kimberley Brown, Herta M Crauwels
INTRODUCTION: Physiologic changes during pregnancy may impact the pharmacokinetics of drugs. In addition, efficacy and safety/tolerability concerns have been identified for some antiretroviral agents. METHODS: Human immunodeficiency virus (HIV)-1-infected pregnant women (18-26 weeks gestation) receiving the non-nucleoside reverse transcriptase inhibitor rilpivirine 25 mg once daily were enrolled in this phase 3b, open-label study examining the impact of pregnancy on the pharmacokinetics of rilpivirine when it is given in combination with other antiretroviral agents...
January 15, 2018: Infectious Diseases and Therapy
https://www.readbyqxmd.com/read/29334959/a-structural-equation-model-of-perceived-and-internalized-stigma-depression-and-suicidal-status-among-people-living-with-hiv-aids
#15
Chengbo Zeng, Linghua Li, Yan Alicia Hong, Hanxi Zhang, Andrew Walker Babbitt, Cong Liu, Lixia Li, Jiaying Qiao, Yan Guo, Weiping Cai
BACKGROUND: Previous studies have shown positive association between HIV-related stigma and depression, suicidal ideation, and suicidal attempt among people living with HIV/AIDS (PLWH). But few studies have examined the mechanisms among HIV-related stigma, depression, and suicidal status (suicidal ideation and/or suicidal attempt) in PLWH. The current study examined the relationships among perceived and internalized stigma (PIS), depression, and suicidal status among PLWH in Guangzhou, China using structural equation modeling...
January 15, 2018: BMC Public Health
https://www.readbyqxmd.com/read/29334711/-serologic-surveillance-indicators-analysis-among-syphilis-infected-pregnant-women-in-east-china
#16
L X Dou, Q Wang, X Y Wang, Y P Qiao, M Su, X Jin, A L Wang
Objective: To analyze serologic surveillance indicators during pregnancy among syphilis-infected women who delivered in 2013 in East China. Methods: Data were from national 'Information System of Prevention of Mother-to-child Transmission of HIV, syphilis and HBV Management' and in total 5 206 syphilis-infected pregnant women who delivered in 2013 and in East China were involved in the analysis. Information on demographic characters, laboratory tests, and treatment regimens were collected. The maternal non-treponemal testing surveillance and titer distribution were described and compare the proportions between pregnant women receiving standard testing and non-standard testing, taking baseline testing and testing before delivery or at the third trimester...
January 6, 2018: Zhonghua Yu Fang Yi Xue za Zhi [Chinese Journal of Preventive Medicine]
https://www.readbyqxmd.com/read/29334550/chronic-hepatitis-c-virus-infection-and-subsequent-hiv-viral-load-among-women-with-hiv-initiating-antiretroviral-therapy
#17
Sarah J Willis, Stephen R Cole, Daniel Westreich, Andrew Edmonds, Christopher B Hurt, Svenja Albrecht, Kathryn Anastos, Michael Augenbraun, Margaret Fischl, Audrey L French, Aley G Kalapila, Roksana Karim, Marion G Peters, Michael Plankey, Eric C Seaberg, Phyllis C Tien, Adaora A Adimora
OBJECTIVE(S): One in four persons living with HIV is coinfected with HCV. Biological and behavioral mechanisms may increase HIV viral load among coinfected persons. Therefore, we estimated the longitudinal effect of chronic HCV on HIV suppression after ART initiation among women with HIV (WWH). DESIGN: HIV RNA was measured every six months among 441 WWH in the Women's Interagency HIV Study who initiated ART from 2000-2015. METHODS: Log-binomial regression models were used to compare the proportion of study visits with detectable HIV RNA between women with and without chronic HCV...
January 13, 2018: AIDS
https://www.readbyqxmd.com/read/29334549/cost-effectiveness-of-alternative-strategies-for-provision-of-hiv-pre-exposure-prophylaxis-for-people-who-inject-drugs
#18
Rui Fu, Douglas K Owens, Margaret L Brandeau
BACKGROUND: Oral HIV pre-exposure prophylaxis (PrEP) has been recommended as a means of HIV prevention among people who inject drugs (PWID) but, at current prices, is unlikely to be cost-effective for all PWID. OBJECTIVE: To determine the cost-effectiveness of alternative strategies for enrolling PWID in PrEP. DESIGN: Dynamic network model that captures HIV transmission and progression among PWID in a representative US urban center. OUTCOME MEASURES: HIV infections averted, discounted costs and quality-adjusted life-years (QALYs), and incremental cost-effectiveness ratios (ICERs)...
January 13, 2018: AIDS
https://www.readbyqxmd.com/read/29334546/impact-of-early-antiretroviral-therapy-eligibility-on-hiv-acquisition-household-level-evidence-from-rural-south-africa
#19
Catherine E Oldenburg, Jacob Bor, Guy Harling, Frank Tanser, Tinofa Mutevedzi, Maryam Shahmanesh, George R Seage, Victor De Gruttola, Matthew J Mimiaga, Kenneth H Mayer, Deenan Pillay, Till Bärnighausen
OBJECTIVES: We investigate the effect of immediate ART eligibility on HIV incidence among HIV-uninfected household members. DESIGN: Regression discontinuity study arising from a population-based cohort. METHODS: Household members of patients seeking care at the Hlabisa HIV Treatment and Care Programme in rural KwaZulu-Natal South Africa between January 2007 and August 2011 with CD4 counts up to 350 cells/μl were eligible for inclusion if they had at least two HIV tests and were HIV-uninfected at the time the index patient linked to care (N = 4,115)...
January 13, 2018: AIDS
https://www.readbyqxmd.com/read/29334545/bacterial-vaginosis-modifies-the-association-between-hormonal-contraception-and-hiv-acquisition
#20
Lisa Haddad, Kristin M Wall, William Kilembe, Bellington Vwailika, Naw Htee, Ilene Brill, Elwyn Chomba, Amanda Tichacek, Susan Allen
OBJECTIVE: To examine BV as an effect modifier for the association between hormonal contraception (HC) and incident HIV infection DESIGN:: Serodiscordant couples enrolled in an open longitudinal cohort in Lusaka, Zambia from 1994-2012. This analysis was restricted to couples with an HIV-positive man enrolled between1994-2002 when a quarterly genital tract examination and HIV testing was performed. METHODS: Multivariate Cox models evaluated the association between contraceptive method and HIV-acquisition, stratified by time-varying BV status...
January 13, 2018: AIDS
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