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AIDS/HIV

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PLA2G1B is involved in CD4 anergy and CD4 lymphopenia in HIV-infected patients
Julien Pothlichet, … , Gérard Lambeau, Jacques Thèze
Julien Pothlichet, … , Gérard Lambeau, Jacques Thèze
Published March 3, 2020
Citation Information: J Clin Invest. 2020. https://doi.org/10.1172/JCI131842.
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PLA2G1B is involved in CD4 anergy and CD4 lymphopenia in HIV-infected patients

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Abstract

The precise mechanism leading to profound immunodeficiency of HIV-infected patients is still only partially understood. Here, we show that more than 80% of CD4 T cells from HIV-infected patients have morphological abnormalities. Their membranes exhibited numerous large abnormal membrane microdomains (aMMDs), which trap and inactivate physiological receptors, such as that for IL-7. In patient plasma, we identified phospholipase A2 group IB (PLA2G1B) as the key molecule responsible for the formation of aMMDs. At physiological concentrations, PLA2G1B synergized with the HIV gp41 envelope protein, which appears to be a driver that targets PLA2G1B to the CD4 T-cell surface. The PLA2G1B/gp41 pair induced CD4 T cell unresponsiveness (anergy). At high concentrations in vitro, PLA2G1B acted alone, independently of gp41, and inhibited the IL-2, IL-4, and IL-7 responses, as well as TCR-mediated activation and proliferation, of CD4 T cells. PLA2G1B also decreased CD4 T-cell survival in vitro, likely playing a role in CD4 lymphopenia in conjunction with its induced IL-7 receptor defects. The effects on CD4 T-cell anergy could be blocked by a PLA2G1B-specific neutralizing mAb in vitro and in vivo. The PLA2G1B/gp41 pair constitutes a new mechanism of immune dysfunction and a compelling target for boosting immune responses in HIV-infected patients.

Authors

Julien Pothlichet, Thierry Rose, Florence Bugault, Louise Jeammet, Annalisa Meola, Ahmed Haouz, Frederick Saul, David Geny, José Alcami, Ezequiel Ruiz-Mateos Carmona, Luc Teyton, Gérard Lambeau, Jacques Thèze

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BCL-2 antagonism sensitizes cytotoxic t cell-resistant hiv reservoirs to elimination ex vivo
Yanqin Ren, … , Catherine M. Bollard, R. Brad Jones
Yanqin Ren, … , Catherine M. Bollard, R. Brad Jones
Published February 6, 2020
Citation Information: J Clin Invest. 2020. https://doi.org/10.1172/JCI132374.
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BCL-2 antagonism sensitizes cytotoxic t cell-resistant hiv reservoirs to elimination ex vivo

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Abstract

Curing HIV infection will require the elimination of a reservoir of infected CD4+ T-cells that persists despite HIV-specific cytotoxic T-cell (CTL) responses. While viral latency is a critical factor in this persistence, recent evidence also suggests a role for intrinsic resistance of reservoir-harboring cells to CTL killing. This resistance may have contributed to negative outcomes of clinical trials, where pharmacologic latency reversal has thus far failed to drive reductions in HIV reservoirs. Through transcriptional profiling, we herein identified over-expression of the pro-survival factor BCL-2 as a distinguishing feature of CD4+ T-cells that survived CTL killing. We show that the inducible HIV reservoir was disproportionately present in BCL-2hi subsets, in ex vivo CD4+ T-cells. Treatment with the BCL-2 antagonist ‘ABT-199’ alone was not sufficient to drive reductions in ex vivo viral reservoirs, when tested either alone or with a latency reversing agent (LRA). However, the triple combination of strong LRAs, HIV-specific T-cells, and a BCL-2 antagonist uniquely enabled the depletion of ex vivo viral reservoirs. Our results provide rationale for novel therapeutic approaches targeting HIV cure and, more generally, suggest consideration of BCL-2 antagonism as a means of enhancing CTL immunotherapy in other settings, such as cancer.

Authors

Yanqin Ren, Szu-Han Huang, Shabnum Patel, Winiffer D. Conce Alberto, Dean Magat, Dughan J. Ahimovic, Amanda B. Macedo, Ryan Durga, Dora Chan, Elizabeth Zale, Talia M. Mota, Ronald Truong, Thomas Rohwetter, Chase D. McCann, Colin M. Kovacs, Erika Benko, Avery Wimpelberg, Christopher M. Cannon, W. David Hardy, Alberto Bosque, Catherine M. Bollard, R. Brad Jones

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Plasmacytoid dendritic cells sense HIV replication before detectable viremia following treatment interruption
Julie L. Mitchell, … , Jintanat Ananworanich, Lydie Trautmann
Julie L. Mitchell, … , Jintanat Ananworanich, Lydie Trautmann
Published February 4, 2020
Citation Information: J Clin Invest. 2020. https://doi.org/10.1172/JCI130597.
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Plasmacytoid dendritic cells sense HIV replication before detectable viremia following treatment interruption

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Abstract

Plasmacytoid dendritic cells (pDCs) are robust producers of interferon α (IFNα) and one of the first immune cells to respond to simian immunodeficiency virus infection. To elucidate responses to early HIV-1 replication, we studied blood pDCs in 29 HIV-infected participants who initiated antiretroviral therapy during acute infection and underwent analytic treatment interruption (ATI). An increased frequency of partially activated pDCs was observed in the blood prior to detection of HIV RNA. Concurrent with peak pDC frequency, there was a transient decline in the ability of pDCs to produce IFNα in vitro, which correlated with decreased interferon regulatory factory 7 (IRF7) and NF-kB phosphorylation. Levels of phosphorylated IRF7 and NF-kB inversely correlated with plasma IFNα2 levels, implying that pDCs were refractory to in vitro stimulation after IFNα production in vivo. After ATI, decreased expression of IFN genes in pDCs inversely correlated with time to viral detection, suggesting that pDC IFN loss is part of an effective early immune response. These data, from a limited cohort, provide a critical first step in understanding the earliest immune response to HIV-1 and suggest that changes in blood pDC frequency and function can be used as an indicator of viral replication before detectable plasma viremia.

Authors

Julie L. Mitchell, Hiroshi Takata, Roshell Muir, Donn J. Colby, Eugene Kroon, Trevor A. Crowell, Carlo Sacdalan, Suteeraporn Pinyakorn, Suwanna Pattamaswin, Khunthalee Benjapornpong, Rapee Trichavaroj, Randall L. Tressler, Lawrence Fox, Victoria R. Polonis, Diane L. Bolton, Frank Maldarelli, Sharon R. Lewin, Elias K. Haddad, Praphan Phanuphak, Merlin L. Robb, Nelson L. Michael, Mark de Souza, Nittaya Phanuphak, Jintanat Ananworanich, Lydie Trautmann

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HIV persists throughout deep tissues with repopulation from multiple anatomical sources
Antoine Chaillon, … , Bram Vrancken, Davey M. Smith
Antoine Chaillon, … , Bram Vrancken, Davey M. Smith
Published January 7, 2020
Citation Information: J Clin Invest. 2020. https://doi.org/10.1172/JCI134815.
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HIV persists throughout deep tissues with repopulation from multiple anatomical sources

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Abstract

Background. Understanding HIV dynamics across the human body is important for cure efforts. This goal has been hampered by technical difficulties and the challenge to obtain fresh tissues. Methods. This observational study evaluated 6 persons with HIV (4 virally suppressed with antiretroviral therapy and 2 with rebound viremia after stopping therapy) who provided blood serially before death and their bodies for rapid autopsy. HIV reservoirs were characterized by digital droplet PCR and single genome amplification and sequencing of full-length (FL) envelope HIV. Phylogeographic methods reconstructed HIV spread and generalized linear models tested for viral factors associated with dispersal. Results. Across participants, HIV DNA levels varied from ~0 to 659 copies/106 cells (IQR:22.9-126.5). A total of 605 intact FL env sequences were recovered in antemortem blood cells and across 28 tissues (IQR:5-9). Sequence analysis showed: 1) emergence of large, identical, intact HIV RNA populations in blood after stopping therapy, which repopulated tissues throughout the body, 2) multiple sites acted as hubs for HIV dissemination but blood and lymphoid tissues were the main source, and 3) viral exchanges occurred within brain areas and across the blood brain barrier, and 4) migration was associated with low HIV divergence between sites and higher diversity at the recipient site. Conclusion. HIV reservoirs persist in all deep tissues, and blood is the main source of dispersal. This may explain why eliminating HIV susceptibility in circulating T cells via bone marrow transplants allowed some people with HIV to have therapy free remission, even though deeper tissue reservoirs were not targeted. Trial registration. Not applicable. Funding. National Institute of Health Grants (P01 AI31385, P30 AI036214, AI131971-01, AI120009AI036214,HD094646, AI027763, AI134295, AI68636).

Authors

Antoine Chaillon, Sara Gianella, Simon Dellicour, Stephen A. Rawlings, Timothy E. Schlub, Michelli Faria De Oliveira, Caroline Ignacio, Magali Porrachia, Bram Vrancken, Davey M. Smith

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High-fat diet exacerbates SIV pathogenesis and accelerates disease progression
Tianyu He, … , Cristian Apetrei, Ivona Pandrea
Tianyu He, … , Cristian Apetrei, Ivona Pandrea
Published November 11, 2019
Citation Information: J Clin Invest. 2019. https://doi.org/10.1172/JCI121208.
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High-fat diet exacerbates SIV pathogenesis and accelerates disease progression

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Abstract

Consuming a high-fat diet (HFD) is a risk factor for obesity and diabetes; both of these diseases are also associated with systemic inflammation, similar to HIV infection. A HFD induces intestinal dysbiosis and impairs liver function and coagulation, with a potential negative impact on HIV/SIV pathogenesis. We administered a HFD rich in saturated fats and cholesterol to nonpathogenic (African green monkeys) and pathogenic (pigtailed macaques) SIV hosts. The HFD had a negative impact on SIV disease progression in both species. Thus, increased cell-associated SIV DNA and RNA occurred in the HFD-receiving nonhuman primates, indicating a potential reservoir expansion. The HFD induced prominent immune cell infiltration in the adipose tissue, an important SIV reservoir, and heightened systemic immune activation and inflammation, altering the intestinal immune environment and triggering gut damage and microbial translocation. Furthermore, HFD altered lipid metabolism and HDL oxidation and also induced liver steatosis and fibrosis. These metabolic disturbances triggered incipient atherosclerosis and heightened cardiovascular risk in the SIV-infected HFD-receiving nonhuman primates. Our study demonstrates that dietary intake has a discernable impact on the natural history of HIV/SIV infections and suggests that dietary changes can be used as adjuvant approaches for HIV-infected subjects, to reduce inflammation and the risk of non-AIDS comorbidities and possibly other infectious diseases.

Authors

Tianyu He, Cuiling Xu, Noah Krampe, Stephanie M. Dillon, Paola Sette, Elizabeth Falwell, George S. Haret-Richter, Tiffany Butterfield, Tammy L. Dunsmore, William M. McFadden Jr., Kathryn J. Martin, Benjamin B. Policicchio, Kevin D. Raehtz, Ellen P. Penn, Russell P. Tracy, Ruy M. Ribeiro, Daniel N. Frank, Cara C. Wilson, Alan L. Landay, Cristian Apetrei, Ivona Pandrea

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In vivo delivery of synthetic DNA-encoded antibodies induces broad HIV-1-neutralizing activity
Megan C. Wise, … , Laurent Humeau, David B. Weiner
Megan C. Wise, … , Laurent Humeau, David B. Weiner
Published November 7, 2019
Citation Information: J Clin Invest. 2019. https://doi.org/10.1172/JCI132779.
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In vivo delivery of synthetic DNA-encoded antibodies induces broad HIV-1-neutralizing activity

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Abstract

Interventions to prevent HIV-1 infection and alternative tools in HIV cure therapy remain pressing goals. Recently, numerous broadly neutralizing HIV-1 monoclonal antibodies (bNAbs) have been developed which possess the characteristics necessary for potential prophylactic or therapeutic approaches. However, formulation complexities especially for multi-antibody deliveries, long infusion times, and production issues could limit the use of these bNAbs when deployed globally impacting their potential application. Here, we describe an approach utilizing synthetic DNA-encoded monoclonal antibodies (dMAbs) for direct in vivo production of prespecified neutralizing activity. We designed 16 different bNAbs as dMAbs cassettes and studied their activity in small and large animals. Sera from animals administered dMAbs neutralized multiple HIV-1 isolates with similar activity to their parental recombinant MAbs. Delivery of multiple dMAbs to a single animal led to increased neutralization breadth. Two dMAbs, PGDM1400 and PGT121, were advanced into non-human primates for study. High peak circulating levels (between 6-34µg/ml) of these dMAbs were measured and the sera of all animals displayed broad neutralizing activity. The dMAb approach provides an important local delivery platform for the in vivo generation of HIV-1 bNAbs and for other infectious disease antibodies.

Authors

Megan C. Wise, Ziyang Xu, Edgar Tello-Ruiz, Charles Beck, Aspen Trautz, Ami Patel, Sarah T.C. Elliott, Neethu Chokkalingam, Sophie Kim, Melissa G. Kerkau, Kar Muthumani, Jingjing Jiang, Paul Fisher, Stephany J. Ramos, Trevor R.F. Smith, Janess Mendoza, Kate E. Broderick, David C. Montefiori, Guido Ferrari, Daniel W. Kulp, Laurent Humeau, David B. Weiner

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SIV-specific CD8+ T cells are clonotypically distinct across lymphoid and mucosal tissues
Carly E. Starke, … , David A. Price, Jason M. Brenchley
Carly E. Starke, … , David A. Price, Jason M. Brenchley
Published October 29, 2019
Citation Information: J Clin Invest. 2019. https://doi.org/10.1172/JCI129161.
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SIV-specific CD8+ T cells are clonotypically distinct across lymphoid and mucosal tissues

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Abstract

CD8+ T cell responses are necessary for immune control of simian immunodeficiency virus (SIV). However, the key parameters that dictate antiviral potency remain elusive, conceivably because most studies to date have been restricted to analyses of circulating CD8+ T cells. We conducted a detailed clonotypic, functional, and phenotypic survey of SIV-specific CD8+ T cells across multiple anatomical sites in chronically infected rhesus macaques with high (> 10,000 copies/mL plasma) or low burdens of viral RNA (< 10,000 copies/mL plasma). No significant differences in response magnitude were identified across anatomical compartments. Rhesus macaques with low viral loads (VLs) harbored higher frequencies of polyfunctional CXCR5+ SIV-specific CD8+ T cells in various lymphoid tissues and higher proportions of unique Gag-specific CD8+ T cell clonotypes in the mesenteric lymph nodes relative to rhesus macaques with high VLs. In addition, public Gag-specific CD8+ T cell clonotypes were more commonly shared across distinct anatomical sites than the corresponding private clonotypes, which tended to form tissue-specific repertoires, especially in the peripheral blood and the gastrointestinal tract. Collectively, these data suggest that functionality and tissue localization are important determinants of CD8+ T cell-mediated efficacy against SIV.

Authors

Carly E. Starke, Carol L. Vinton, Kristin Ladell, James E. McLaren, Alexandra M. Ortiz, Joseph C. Mudd, Jacob K. Flynn, Stephen H. Lai, Fan Wu, Vanessa M. Hirsch, Samuel Darko, Daniel C. Douek, David A. Price, Jason M. Brenchley

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Antibody Fc effector functions and IgG3 associate with decreased HIV-1 risk
Scott D. Neidich, … , Peter B. Gilbert, Georgia D. Tomaras
Scott D. Neidich, … , Peter B. Gilbert, Georgia D. Tomaras
Published October 7, 2019
Citation Information: J Clin Invest. 2019. https://doi.org/10.1172/JCI126391.
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Antibody Fc effector functions and IgG3 associate with decreased HIV-1 risk

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Abstract

HVTN 505 is a preventative vaccine efficacy trial testing DNA followed by recombinant adenovirus serotype 5 (rAd5) in circumcised, Ad5-seronegative men and transgendered persons who have sex with men in the United States. Identified immune correlates of lower HIV-1 risk and a virus sieve analysis revealed that, despite lacking overall efficacy, vaccine-elicited responses exerted pressure on infecting HIV-1 viruses. To interrogate the mechanism of the antibody correlate of HIV-1 risk, we examined antigen-specific antibody recruitment of Fcγ receptors (FcγRs), antibody-dependent cellular phagocytosis (ADCP), and the role of anti-envelope (anti-Env) IgG3. In a prespecified immune correlates analysis, antibody-dependent monocyte phagocytosis and antibody binding to FcγRIIa correlated with decreased HIV-1 risk. Follow-up analyses revealed that anti-Env IgG3 breadth correlated with reduced HIV-1 risk, anti-Env IgA negatively modified infection risk by Fc effector functions, and that vaccine recipients with a specific FcγRIIa single-nucleotide polymorphism locus had a stronger correlation with decreased HIV-1 risk when ADCP, Env-FcγRIIa, and IgG3 binding were high. Additionally, FcγRIIa engagement correlated with decreased viral load setpoint in vaccine recipients who acquired HIV-1. These data support a role for vaccine-elicited anti–HIV-1 Env IgG3, antibody engagement of FcRs, and phagocytosis as potential mechanisms for HIV-1 prevention.

Authors

Scott D. Neidich, Youyi Fong, Shuying S. Li, Daniel E. Geraghty, Brian D. Williamson, William Chad Young, Derrick Goodman, Kelly E. Seaton, Xiaoying Shen, Sheetal Sawant, Lu Zhang, Allan C. deCamp, Bryan S. Blette, Mengshu Shao, Nicole L. Yates, Frederick Feely, Chul-Woo Pyo, Guido Ferrari, HVTN 505 Team, Ian Frank, Shelly T. Karuna, Edith M. Swann, John R. Mascola, Barney S. Graham, Scott M. Hammer, Magdalena E. Sobieszczyk, Lawrence Corey, Holly E. Janes, M. Juliana McElrath, Raphael Gottardo, Peter B. Gilbert, Georgia D. Tomaras

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Glycan-dependent HIV-specific neutralizing antibodies bind to cells of uninfected individuals
Jana Blazkova, … , Susan Moir, Tae-Wook Chun
Jana Blazkova, … , Susan Moir, Tae-Wook Chun
Published October 7, 2019
Citation Information: J Clin Invest. 2019. https://doi.org/10.1172/JCI125955.
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Glycan-dependent HIV-specific neutralizing antibodies bind to cells of uninfected individuals

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Abstract

A number of highly potent and broadly neutralizing antibodies (bNAbs) against the human immunodeficiency virus (HIV) have recently been shown to prevent transmission of the virus, suppress viral replication, and delay plasma viral rebound following discontinuation of antiretroviral therapy in animal models and infected humans. However, the degree and extent to which such bNAbs interact with primary lymphocytes have not been fully delineated. Here, we show that certain glycan-dependent bNAbs, such as PGT121 and PGT151, bind to B, activated T, and natural killer (NK) cells of HIV-infected and -uninfected individuals. Binding of these bNAbs, particularly PGT121 and PGT151, to activated CD4+ and CD8+ T cells was mediated by complex-type glycans and was abrogated by enzymatic inhibition of N-linked glycosylation. In addition, a short-term incubation of PGT151 and primary NK cells led to degranulation and cellular death. Our data suggest that the propensity of certain bNAbs to bind uninfected/bystander cells has the potential for unexpected outcomes in passive-transfer studies and underscore the importance of antibody screening against primary lymphocytes.

Authors

Jana Blazkova, Eric W. Refsland, Katherine E. Clarridge, Victoria Shi, J. Shawn Justement, Erin D. Huiting, Kathleen R. Gittens, Xuejun Chen, Stephen D. Schmidt, Cuiping Liu, Nicole Doria-Rose, John R. Mascola, Alonso Heredia, Susan Moir, Tae-Wook Chun

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DNA priming and gp120 boosting induces HIV-specific antibodies in a randomized clinical trial
Nadine G. Rouphael, … , Michael C. Keefer, the HVTN 105 Protocol Team and the NIAID HIV Vaccine Trials Network
Nadine G. Rouphael, … , Michael C. Keefer, the HVTN 105 Protocol Team and the NIAID HIV Vaccine Trials Network
Published September 30, 2019
Citation Information: J Clin Invest. 2019. https://doi.org/10.1172/JCI128699.
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DNA priming and gp120 boosting induces HIV-specific antibodies in a randomized clinical trial

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Abstract

BACKGROUND RV144 is the only preventive HIV vaccine regimen demonstrating efficacy in humans. Attempting to build upon RV144 immune responses, we conducted a phase 1, multicenter, randomized, double-blind trial to assess the safety and immunogenicity of regimens substituting the DNA-HIV-PT123 (DNA) vaccine for ALVAC-HIV in different sequences or combinations with AIDSVAX B/E (protein).METHODS One hundred and four HIV-uninfected participants were randomized to 4 treatment groups (T1, T2, T3, and T4) and received intramuscular injections at 0, 1, 3, and 6 months (M): T1 received protein at M0 and M1 and DNA at M3 and M6; T2 received DNA at M0 and M1 and protein at M3 and M6; T3 received DNA at M0, M1, M3, and M6 with protein coadministered at M3 and M6; and T4 received protein and DNA coadministered at each vaccination visit.RESULTS All regimens were well tolerated. Antibodies binding to gp120 and V1V2 scaffold were observed in 95%–100% of participants in T3 and T4, two weeks after final vaccination at high magnitude. While IgG3 responses were highest in T3, a lower IgA/IgG ratio was observed in T4. Binding antibodies persisted at 12 months in 35%–100% of participants. Antibody-dependent cell-mediated cytotoxicity and tier 1 neutralizing-antibody responses had higher response rates for T3 and T4, respectively. CD4+ T cell responses were detectable in all treatment groups (32%–64%) without appreciable CD8+ T cell responses.CONCLUSION The DNA/protein combination regimens induced high-magnitude and long-lasting HIV V1V2–binding antibody responses, and early coadministration of the 2 vaccines led to a more rapid induction of these potentially protective responses.TRIAL REGISTRATION ClinicalTrials.gov NCT02207920.FUNDING National Institute of Allergy and Infectious Diseases (NIAID) grants UM1 AI068614, UM1 AI068635, UM1 AI068618, UM1 AI069511, UM1 AI069470, UM1 AI069534, P30 AI450008, UM1 AI069439, UM1 AI069481, and UM1 AI069496; the National Center for Advancing Translational Sciences, NIH (grant UL1TR001873); and the Bill & Melinda Gates Foundation (grant OPP52845).

Authors

Nadine G. Rouphael, Cecilia Morgan, Shuying S. Li, Ryan Jensen, Brittany Sanchez, Shelly Karuna, Edith Swann, Magdalena E. Sobieszczyk, Ian Frank, Gregory J. Wilson, Hong-Van Tieu, Janine Maenza, Aliza Norwood, James Kobie, Faruk Sinangil, Giuseppe Pantaleo, Song Ding, M. Juliana McElrath, Stephen C. De Rosa, David C. Montefiori, Guido Ferrari, Georgia D. Tomaras, Michael C. Keefer, the HVTN 105 Protocol Team and the NIAID HIV Vaccine Trials Network

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Insight into CD8+ T cell expansion during HIV-1 infection
Souheil-Antoine Younes and colleagues provide evidence that IL-15 is involved in the expansion of CD8+ T cells in chronic HIV infection...
Published June 20, 2016
Scientific Show StopperAIDS/HIV

Designer proteins to hunt and kill latent HIV-1
Julia Sung, Joy Pickeral, Liquin Liu and colleagues developed designer proteins that detect and destroy rare populations of HIV-infected cells…
Published September 28, 2015
Scientific Show StopperAIDS/HIV
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