Posts filed under ‘HIV/SIDA Laboratorio’

Compromised CD4:CD8 ratio recovery in people living with HIV aged over 50 years: an observational study.

HIV Med. February 2020 V.21 N.2 P.109-118.

Francis-Morris A1, Mackie NE2, Eliahoo J3, Ramzan F2, Fidler S1,4, Pollock KM1,2,4.

Abstract

OBJECTIVES:

Persistent CD4:CD8 ratio inversion (< 1) is associated with mortality in older people. We investigated the interaction of the effects of baseline CD8 count and age at HIV diagnosis on CD4:CD8 ratio recovery with antiretroviral therapy (ART).

METHODS:

An observational study (1 January 2007 to 31 December 2016) was carried out using routinely collected data from the HIV outpatient services at Imperial College Healthcare NHS Trust, London, UK. CD4 and CD8 counts, prior to and during ART, treatment during primary HIV infection (PHI) and HIV-1 viral load were included in univariate and multivariate analyses using Cox proportional hazard regression.

RESULTS:

Data were included for 876 patients starting ART, where HIV suppression was achieved. Of these patients, 741 of 876 (84.6%) were male and 507 of 876 (57.9%) were Caucasian. The median time on ART was 38 [interquartile range (IQR) 17-66] months. CD8 count change on ART was bidirectional; low CD8 counts (≤ 600 cells/μL) increased and high CD8 counts (> 900 cells/μL) decreased. The median pre-ART CD4:CD8 ratio was 0.41 (IQR 0.24-0.63), and recovery (≥ 1) occurred in 274 of 876 patients (31.3%). Pre- and post-ART CD4:CD8 ratios were lower in those aged > 50 years compared with young adults aged 18-30 years (P < 0.001 and P = 0.002, respectively). After adjustment, younger age at HIV diagnosis (P < 0.001) and treatment during PHI (P < 0.001) were favourable for CD4:CD8 ratio normalization.

CONCLUSIONS:

Older age (> 50 years) at HIV diagnosis was associated with persistent CD4:CD8 ratio inversion, whereas treatment of PHI was protective. These findings confirm the need for testing and early treatment of people aged > 50 years, and could be used in a risk management algorithm for enhanced surveillance.

PDF

https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7003811/pdf/HIV-21-109.pdf

March 4, 2020 at 3:38 pm

2020-01 Guidelines for the Use of Antiretroviral Agents in Adults and Adolescents with HIV 378 pag DHHS

Developed by the DHHS Panel on Antiretroviral Guidelines for Adults and Adolescents – A Working Group of the Office of AIDS Research Advisory Council (OARAC)

What’s New in the Guidelines? (Last updated December 18, 2019 and last reviewed December 18, 2019)

* Antiretroviral Therapy to Prevent Sexual Transmission of HIV (Treatment as Prevention)

* Dolutegravir Recommendations for Individuals of Childbearing Potential

* Laboratory Testing for Initial Assessment and Monitoring of People with HIV Receiving Antiretroviral   Therapy

* Initiation of Antiretroviral Therapy

* What to Start

* Optimizing Antiretroviral Therapy in the Setting of Virologic Suppression

* Acute and Recent (Early) HIV Infection

* HIV and the Older Person

* Tuberculosis/HIV Coinfection

* Cost Considerations and Antiretroviral Therapy

* Table Updates

PDF

https://aidsinfo.nih.gov/contentfiles/lvguidelines/adultandadolescentgl.pdf

January 10, 2020 at 7:32 am

Predictors of Viremia in Postpartum Women on Antiretroviral Therapy.

J Acquir Immune Defic Syndr. January 1, 2020 V.83 N.1 P.72-80.

Background:

HIV-infected, postpartum women on antiretroviral therapy (ART) have high rates of viremia. We examined predictors of postpartum viremia in the PROMISE study.

Methods:

Women with pre-ART CD4+ T-cell counts ≥400 cells/mm3 who started ART during pregnancy were randomized postpartum to continue ART (CTART) or discontinue ART (DCART). Viral load and self-reported adherence were collected every 12 weeks, up to 144 weeks. Women in DCART reinitiated therapy when clinically indicated. Viremia was defined as 2 consecutive viral loads >1000 copies/mL after 24 weeks on ART. Adherence was dichotomized as missing versus not missing ART doses in the past 4 weeks. Predictors of viremia were examined using Cox proportional hazards regression with adherence as a time-varying covariate.

Results:

Among 802 women in the CTART arm, median age at entry was 27 years and median CD4+ T-cell count 696 cells/mm3. Of 175 women in CTART with viremia (22%), 141 had resistance data, and 12% had resistance to their current regimen. There was an estimated 0.12 probability of viremia by week 48 and 0.25 by week 144. Predictors of viremia included missed ART doses within the past 4 weeks, younger age, shorter duration of pre-entry ART, and being from the South American/Caribbean region. Of 137 women in DCART who reinitiated therapy, probability of viremia was similar to CTART (0.24 by week 96; 0.27 by week 144).

Conclusions:

Rates of postpartum viremia are high and viremia is more likely in younger postpartum women who start ART later in pregnancy. Interventions should target these higher-risk women.

FULL TEXT

https://journals.lww.com/jaids/Fulltext/2020/01010/Predictors_of_Viremia_in_Postpartum_Women_on.10.aspx

PDF (CLIC en PDF)

January 1, 2020 at 11:39 am

Changes in Body Mass Index and Atherosclerotic Disease Risk Score After Switching From Tenofovir Disoproxil Fumarate to Tenofovir Alafenamide.

Open Forum Infect Dis. October 4, 2019 V.6 N.10

Schafer JJ1, Sassa KN1, O’Connor JR1, Shimada A2, Keith SW2, DeSimone JA3.

Abstract

BACKGROUND:

Switching from tenofovir disoproxil fumarate (TDF) to tenofovir alafenamide (TAF)-containing antiretroviral therapy (ART) can improve renal function and bone mineral density in people with human immunodeficiency virus (PWH). The switch can also negatively influence cholesterol, but changes in body mass index (BMI) and atherosclerotic cardiovascular disease (ASCVD) risk are unknown.

METHODS:

This retrospective observational study evaluated BMI and ASCVD risk score changes in virologically suppressed PWH who switched from TDF to TAF without switching other ART regimen components. Adults on TDF for ≥1 year with 2 consecutive HIV ribonucleic acid values <200 copies/mL before a TAF switch were included. Body weight, BMI, cholesterol, and ASCVD risk score were collected for the year before and after the switch. Pre- and postswitch values were compared with the Wilcoxon signed-rank test. Changes in BMI and ASCVD scores were modeled using generalized estimating equations regression.

RESULTS:

One hundred ten patients were included. In unadjusted analyses, there were significant increases in weight, BMI, total cholesterol, LDL, HDL, and ASCVD risk score in the year after switching from TDF to TAF (each P ≤ .01). In regression models, switching from TDF to TAF was associated with a 0.45 kg/m2 increase in BMI (95% confidence interval [CI], 0.14-0.76) and a 13% increase in ASCVD risk score (95% CI, 4%-23%).

CONCLUSIONS:

We observed significant BMI and ASCVD score increases in PWH 1 year after switching from TDF to TAF. The mechanism of changes is unclear and requires additional study.

PDF

https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6786703/pdf/ofz414.pdf

November 26, 2019 at 7:19 am

A New Perspective on HIV Diagnostics: Reinterpretation in the Age of Early Treatment

Clin. Microbiol. October 2019 V.57 N.10

Commentary

Early treatment of HIV infection with antiretroviral therapy in recently identified HIV-infected individuals reduces viral replication and decreases the risk of transmission.

The screening and supplemental, confirmatory assays used to identify infection are influenced by early treatment and may obscure a clear diagnosis of HIV infection.

In this issue of the Journal of Clinical Microbiology, Manak et al. demonstrate the impact of antiretroviral therapy on the evolution of biomarkers that have traditionally been used for identifying HIV infection

abstract

https://jcm.asm.org/content/57/10/e00978-19.abstract?etoc

PDF

https://jcm.asm.org/content/jcm/early/2019/07/26/JCM.00978-19.full.pdf

September 24, 2019 at 3:18 pm

Possible clearance of transfusion-acquired nef/LTR-deleted attenuated HIV-1 infection by an elite controller with CCR5 Δ32 heterozygous and HLA-B57 genotype

J Virus Erad.  Apr 1, 2019 V.5 N.2 P.73-83.

Zaunders J1,2, Dyer WB3,4, Churchill M5, Munier CML2, Cunningham PH1, Suzuki K1, McBride K2, Hey-Nguyen W2, Koelsch K2, Wang B6, Hiener B7, Palmer S7, Gorry PR5, Bailey M2, Xu Y2, Danta M8, Seddiki N9, Cooper DA1,2, Saksena NK10,11, Sullivan JS3,12, Riminton S13, Learmont J3, Kelleher AD1,2.

Author information

1 Centre for Applied Medical Research, St Vincent’s Hospital, Sydney, NSW, Australia.

2 Kirby Institute, University of New South Wales, Sydney, NSW, Australia.

3 Australian Red Cross Blood Service, Sydney, NSW, Australia.

4 Faculty of Medicine and Health, University of Sydney, NSW, Australia.

5 School of Health and Biomedical Sciences, College of Science, Engineering and Health, RMIT University, Bundoora, VIC, Australia.

6 Ingham Institute, Liverpool, NSW, Australia.

7 Centre for Virus Research, Westmead Institute for Medical Research, University of Sydney, Sydney, NSW, Australia.

8 Department of Gastroenterology and Hepatology, St Vincent’s Hospital, Sydney, NSW, Australia.

9 Vaccine Research Institute, Faculté de Médecine, Université Paris Est Créteil, Créteil, France.

10 IGO Neurodegenerative Disease Section, Sydney, NSW, Australia.

11 China National Gene Bank, Beijing Institute of Genomics, Shenzhen, China.

12 Central Clinical School, University of Sydney, NSW, Australia.

13 Department of Clinical Immunology, Concord Repatriation General Hospital, Sydney, NSW, Australia.

Abstract

BACKGROUND:

Subject C135 is one of the members of the Sydney Blood Bank Cohort, infected in 1981 through transfusion with attenuated nef/3′ long terminal repeat (LTR)-deleted HIV-1, and has maintained undetectable plasma viral load and steady CD4 cell count, in the absence of therapy. Uniquely, C135 combines five factors separately associated with control of viraemia: nef/LTR-deleted HIV-1, HLA-B57, HLA-DR13, heterozygous CCR5 Δ32 genotype and vigorous p24-stimulated peripheral blood mononuclear cell (PBMC) proliferation. Therefore, we studied in detail viral burden and immunological responses in this individual.

METHODS:

PBMC and gut and lymph node biopsy samples were analysed for proviral HIV-1 DNA by real-time and nested PCRs, and nef/LTR alleles by nested PCR. HIV-specific antibodies were studied by Western blotting, and CD4+ and CD8+ T lymphocyte responses were measured by proliferation and cytokine production in vitro.

RESULTS:

PBMC samples from 1996, but not since, showed amplification of nef alleles with gross deletions. Infectious HIV-1 was never recovered. Proviral HIV-1 DNA was not detected in recent PBMC or gut or lymph node biopsy samples. C135 has a consistently weak antibody response and a substantial CD4+ T cell proliferative response to a previously described HLA-DR13-restricted epitope of HIV-1 p24 in vitro, which augmented a CD8+ T cell response to an immunodominant HLA-B57-restricted epitope of p24, while his T cells show reduced levels of CCR5.

CONCLUSIONS:

Subject C135’s early PCR and weak antibody results are consistent with limited infection with a poorly replicating nef/LTR-deleted strain of HIV-1. With his HLA-B57-restricted gag-specific CD8 and helper HLA-DR13-restricted CD4 T cell proliferative responses, C135 appears to have cleared his HIV-1 infection 37 years after transfusion.

PDF

https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6543488/pdf/jve-5-73.pdf

August 16, 2019 at 3:35 pm

Possible clearance of transfusion-acquired nef/LTR-deleted attenuated HIV-1 infection by an elite controller with CCR5 Δ32 heterozygous and HLA-B57 genotype

J Virus Erad April 2019  5:73

Zaunders J et al.

Background

Subject C135 is one of the members of the Sydney Blood Bank Cohort, infected in 1981 through transfusion with attenuated nef/3′ long terminal repeat (LTR)-deleted HIV-1, and has maintained undetectable plasma viral load and steady CD4 cell count, in the absence of therapy. Uniquely, C135 combines five factors separately associated with control of viraemia: nef/LTR-deleted HIV-1, HLA-B57, HLA-DR13, heterozygous CCR5 Δ32 genotype and vigorous p24-stimulated peripheral blood mononuclear cell (PBMC) proliferation. Therefore, we studied in detail viral burden and immunological responses in this individual.

Methods

PBMC and gut and lymph node biopsy samples were analysed for proviral HIV-1 DNA by real-time and nested PCRs, and nef/LTR alleles by nested PCR. HIV-specific antibodies were studied by Western blotting, and CD4+ and CD8+ T lymphocyte responses were measured by proliferation and cytokine production in vitro.

Results

PBMC samples from 1996, but not since, showed amplification of nef alleles with gross deletions. Infectious HIV-1 was never recovered. Proviral HIV-1 DNA was not detected in recent PBMC or gut or lymph node biopsy samples. C135 has a consistently weak antibody response and a substantial CD4+ T cell proliferative response to a previously described HLA-DR13-restricted epitope of HIV-1 p24 in vitro, which augmented a CD8+ T cell response to an immunodominant HLA-B57-restricted epitope of p24, while his T cells show reduced levels of CCR5.

Conclusions

Subject C135’s early PCR and weak antibody results are consistent with limited infection with a poorly replicating nef/LTR-deleted strain of HIV-1. With his HLA-B57-restricted gag-specific CD8 and helper HLA-DR13-restricted CD4 T cell proliferative responses, C135 appears to have cleared his HIV-1 infection 37 years after transfusion.

FULL TEXT

https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6543488/

PDF

https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6543488/pdf/jve-5-73.pdf

July 16, 2019 at 8:46 am

Sequential LASER ART and CRISPR Treatments Eliminate HIV-1 in a Subset of Infected Humanized Mice.

Nat Commun. July 2, 2019 V.10 N.1 P.2753.

Dash PK1, Kaminski R2, Bella R2, Su H1, Mathews S1, Ahooyi TM2, Chen C2, Mancuso P2, Sariyer R2, Ferrante P2, Donadoni M2, Robinson JA2, Sillman B1, Lin Z1, Hilaire JR1, Banoub M1, Elango M1, Gautam N3, Mosley RL1, Poluektova LY1, McMillan J1, Bade AN1, Gorantla S1, Sariyer IK2, Burdo TH2, Young WB2, Amini S2, Gordon J2, Jacobson JM2, Edagwa B1, Khalili K4, Gendelman HE5.

Author information

1 Department of Pharmacology and Experimental Neuroscience, University of Nebraska Medical Center, Omaha, NE, 68198-5880, USA.

2 Department of Neuroscience, Lewis Katz School of Medicine at Temple University, Philadelphia, PA, 19115, USA.

3 Department of Pharmaceutical Sciences, College of Pharmacy, University of Nebraska Medical Center, Omaha, NE, 68198-5880, USA.

4 Department of Neuroscience, Lewis Katz School of Medicine at Temple University, Philadelphia, PA, 19115, USA. kamel.khalili@temple.edu.

5 Department of Pharmacology and Experimental Neuroscience, University of Nebraska Medical Center, Omaha, NE, 68198-5880, USA. hegendel@unmc.edu.

Abstract

Elimination of HIV-1 requires clearance and removal of integrated proviral DNA from infected cells and tissues. Here, sequential long-acting slow-effective release antiviral therapy (LASER ART) and CRISPR-Cas9 demonstrate viral clearance in latent infectious reservoirs in HIV-1 infected humanized mice.

HIV-1 subgenomic DNA fragments, spanning the long terminal repeats and the Gag gene, are excised in vivo, resulting in elimination of integrated proviral DNA; virus is not detected in blood, lymphoid tissue, bone marrow and brain by nested and digital-droplet PCR as well as RNAscope tests.

No CRISPR-Cas9 mediated off-target effects are detected. Adoptive transfer of human immunocytes from dual treated, virus-free animals to uninfected humanized mice fails to produce infectious progeny virus.

In contrast, HIV-1 is readily detected following sole LASER ART or CRISPR-Cas9 treatment. These data provide proof-of-concept that permanent viral elimination is possible.

PDF

https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6606613/pdf/41467_2019_Article_10366.pdf

July 9, 2019 at 6:57 pm

Long-term outcomes in a large randomized trial of HIV-1 salvage therapy: 96-week results of AIDS Clinical Trials Group A5241 (OPTIONS).

Journal of Infectious Diseases May 28, 2019  [e-pub].

Gandhi RT et al

Background

Short-term (48-week) results of the OPTIONS trial showed that nucleoside reverse transcriptase inhibitors (NRTIs) can be safely omitted from salvage therapy as long as the regimen has a cumulative activity of >2 active antiretroviral medications. The long-term durability of this approach and outcomes in persons who have more-extensive HIV-1 drug resistance are uncertain.

Methods

Participants with virologic failure and anticipated antiretroviral susceptibility received an optimized regimen and were randomized to omit or add NRTIs. A separate group with more resistance (cumulative activity ≤2 active agents) received an optimized regimen including NRTIs.

Results

At week 96, among 360 participants randomized to omit or add NRTIs, 70% and 65% had HIV-1 RNA <200 copies/mL, respectively. Virologic failure was uncommon after week 48. Younger age and starting fewer new antiretroviral medications were associated with higher odds of virologic failure. In the highly resistant group, 53% had HIV-1 RNA <200 copies/mL at week 96.

Conclusions

HIV-1 salvage therapy can safely omit NRTIs without compromising efficacy or durability of response as long as the new regimen has a cumulative activity of >2 active drugs. Younger people and those receiving fewer new antiretrovirals require careful monitoring. Even among individuals with more-extensive resistance, most achieve virologic suppression.

Clinical Trials Registration NCT00537394.

FULL TEXT

https://academic.oup.com/jid/advance-article/doi/10.1093/infdis/jiz281/5499329

PDF (CLIC en PDF))

July 2, 2019 at 3:11 pm

Successful treatment of HIV eliminates sexual transmission

LANCET June 15, 2019 V.393 N.10189 P.2366-2367

COMMENT

Successful treatment of HIV eliminates sexual transmission

In December, 2011, Science recognised the findings of the HPTN 052 study1 as the scientific breakthrough of the year.2 This study showed a 96% reduction in sexual transmission of HIV in serodifferent couples (one partner HIV positive, the other HIV negative) when the HIV-positive partner was successfully treated with antiretroviral therapy (ART).1

However, the HPTN 052 study included only a small number of men who have sex with men (MSM), for whom HIV acquisition often includes anal exposure, an efficient route of HIV transmission.3

Furthermore, the couples in the HPTN 052 study were counselled to use condoms, so the observed benefits of ART also reflected the contribution of safer sexual behaviours.

Accordingly, other investigators4,  5 have subsequently studied HIV transmission in couples who specifically chose not to use condoms…..

FULL TEXT

https://www.thelancet.com/journals/lancet/article/PIIS0140-6736(19)30701-9/fulltext?dgcid=raven_jbs_etoc_email

PDF

https://www.thelancet.com/action/showPdf?pii=S0140-6736%2819%2930701-9

 

LANCET June 15, 2019 V.393 N.10189 P.2428-2438

ARTICLES

Risk of HIV transmission through condomless sex in serodifferent gay couples with the HIV-positive partner taking suppressive antiretroviral therapy (PARTNER): final results of a multicentre, prospective, observational study

Background

The level of evidence for HIV transmission risk through condomless sex in serodifferent gay couples with the HIV-positive partner taking virally suppressive antiretroviral therapy (ART) is limited compared with the evidence available for transmission risk in heterosexual couples. The aim of the second phase of the PARTNER study (PARTNER2) was to provide precise estimates of transmission risk in gay serodifferent partnerships.

Methods

The PARTNER study was a prospective observational study done at 75 sites in 14 European countries. The first phase of the study (PARTNER1; Sept 15, 2010, to May 31, 2014) recruited and followed up both heterosexual and gay serodifferent couples (HIV-positive partner taking suppressive ART) who reported condomless sex, whereas the PARTNER2 extension (to April 30, 2018) recruited and followed up gay couples only. At study visits, data collection included sexual behaviour questionnaires, HIV testing (HIV-negative partner), and HIV-1 viral load testing (HIV-positive partner). If a seroconversion occurred in the HIV-negative partner, anonymised phylogenetic analysis was done to compare HIV-1 pol and env sequences in both partners to identify linked transmissions. Couple-years of follow-up were eligible for inclusion if condomless sex was reported, use of pre-exposure prophylaxis or post-exposure prophylaxis was not reported by the HIV-negative partner, and the HIV-positive partner was virally suppressed (plasma HIV-1 RNA <200 copies per mL) at the most recent visit (within the past year). Incidence rate of HIV transmission was calculated as the number of phylogenetically linked HIV infections that occurred during eligible couple-years of follow-up divided by eligible couple-years of follow-up. Two-sided 95% CIs for the incidence rate of transmission were calculated using exact Poisson methods.

Findings

Between Sept 15, 2010, and July 31, 2017, 972 gay couples were enrolled, of which 782 provided 1593 eligible couple-years of follow-up with a median follow-up of 2·0 years (IQR 1·1–3·5). At baseline, median age for HIV-positive partners was 40 years (IQR 33–46) and couples reported condomless sex for a median of 1·0 years (IQR 0·4–2·9). During eligible couple-years of follow-up, couples reported condomless anal sex a total of 76 088 times. 288 (37%) of 777 HIV-negative men reported condomless sex with other partners. 15 new HIV infections occurred during eligible couple-years of follow-up, but none were phylogenetically linked within-couple transmissions, resulting in an HIV transmission rate of zero (upper 95% CI 0·23 per 100 couple-years of follow-up).

Interpretation

Our results provide a similar level of evidence on viral suppression and HIV transmission risk for gay men to that previously generated for heterosexual couples and suggest that the risk of HIV transmission in gay couples through condomless sex when HIV viral load is suppressed is effectively zero. Our findings support the message of the U=U (undetectable equals untransmittable) campaign, and the benefits of early testing and treatment for HIV.

Funding

National Institute for Health Research.

FULL TEXT

https://www.thelancet.com/journals/lancet/article/PIIS0140-6736(19)30418-0/fulltext?dgcid=raven_jbs_etoc_email

PDF

https://www.thelancet.com/action/showPdf?pii=S0140-6736%2819%2930418-0

June 14, 2019 at 3:57 pm

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