101
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Ferrari G. Tandem bispecific broadly neutralizing antibody - a novel approach to HIV-1 treatment. J Clin Invest 2018; 128:2189-2191. [PMID: 29683434 DOI: 10.1172/jci121078] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022] Open
Abstract
The last decade has led to a significant advance in our knowledge of HIV-1 latency and immunity. However, we are still not close to finding a cure for HIV-1. Although combination antiretroviral therapy (cART) has led to increased survival, almost close to that of the general population, it is still not curative. In the current issue of the JCI, Wu et al. studied the prophylactic and therapeutic potential of an engineered tandem bispecific broadly neutralizing antibody (bs-bnAb), BiIA-SG. This bnAb's breadth and potency were highly effective in protection and treatment settings, as measured by complete viremia control following direct infusion, as well as elimination of infected cells and delay in viral rebound when delivered with a recombinant vector. These observations underscore the need for the clinical development of BiIA-SG for the prevention of HIV-1.
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102
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Yates NL, deCamp AC, Korber BT, Liao HX, Irene C, Pinter A, Peacock J, Harris LJ, Sawant S, Hraber P, Shen X, Rerks-Ngarm S, Pitisuttithum P, Nitayapan S, Berman PW, Robb ML, Pantaleo G, Zolla-Pazner S, Haynes BF, Alam SM, Montefiori DC, Tomaras GD. HIV-1 Envelope Glycoproteins from Diverse Clades Differentiate Antibody Responses and Durability among Vaccinees. J Virol 2018; 92:e01843-17. [PMID: 29386288 PMCID: PMC5874409 DOI: 10.1128/jvi.01843-17] [Citation(s) in RCA: 41] [Impact Index Per Article: 6.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/22/2017] [Accepted: 12/18/2017] [Indexed: 11/20/2022] Open
Abstract
Induction of broadly cross-reactive antiviral humoral responses with the capacity to target globally diverse circulating strains is a key goal for HIV-1 immunogen design. A major gap in the field is the identification of diverse HIV-1 envelope antigens to evaluate vaccine regimens for binding antibody breadth. In this study, we define unique antigen panels to map HIV-1 vaccine-elicited antibody breadth and durability. Diverse HIV-1 envelope glycoproteins were selected based on genetic and geographic diversity to cover the global epidemic, with a focus on sexually acquired transmitted/founder viruses with a tier 2 neutralization phenotype. Unique antigenicity was determined by nonredundancy (Spearman correlation), and antigens were clustered using partitioning around medoids (PAM) to identify antigen diversity. Cross-validation demonstrated that the PAM method was better than selection by reactivity and random selection. Analysis of vaccine-elicited V1V2 binding antibody in longitudinal samples from the RV144 clinical trial revealed the striking heterogeneity among individual vaccinees in maintaining durable responses. These data support the idea that a major goal for vaccine development is to improve antibody levels, breadth, and durability at the population level. Elucidating the level and durability of vaccine-elicited binding antibody breadth needed for protection is critical for the development of a globally efficacious HIV vaccine.IMPORTANCE The path toward an efficacious HIV-1 vaccine will require characterization of vaccine-induced immunity that can recognize and target the highly genetically diverse virus envelope glycoproteins. Antibodies that target the envelope glycoproteins, including diverse sequences within the first and second hypervariable regions (V1V2) of gp120, were identified as correlates of risk for the one partially efficacious HIV-1 vaccine. To build upon this discovery, we experimentally and computationally evaluated humoral responses to define envelope glycoproteins representative of the antigenic diversity of HIV globally. These diverse envelope antigens distinguished binding antibody breadth and durability among vaccine candidates, thus providing insights for advancing the most promising HIV-1 vaccine candidates.
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Affiliation(s)
- Nicole L Yates
- Duke Human Vaccine Institute, Duke University School of Medicine, Durham, North Carolina, USA
- Department of Medicine, Duke University School of Medicine, Durham, North Carolina, USA
| | - Allan C deCamp
- Vaccine and Infectious Disease Division and Statistical Center for HIV/AIDS Research and Prevention, Fred Hutchinson Cancer Research Center, Seattle, Washington, USA
| | - Bette T Korber
- Theoretical Biology and Biophysics, Los Alamos National Laboratory, Los Alamos, New Mexico, USA
| | - Hua-Xin Liao
- Duke Human Vaccine Institute, Duke University School of Medicine, Durham, North Carolina, USA
- Department of Medicine, Duke University School of Medicine, Durham, North Carolina, USA
| | - Carmela Irene
- Public Health Research Institute, New Jersey Medical School, Rutgers University, Newark, New Jersey, USA
| | - Abraham Pinter
- Public Health Research Institute, New Jersey Medical School, Rutgers University, Newark, New Jersey, USA
| | - James Peacock
- Duke Human Vaccine Institute, Duke University School of Medicine, Durham, North Carolina, USA
- Department of Medicine, Duke University School of Medicine, Durham, North Carolina, USA
| | - Linda J Harris
- Vaccine and Infectious Disease Division and Statistical Center for HIV/AIDS Research and Prevention, Fred Hutchinson Cancer Research Center, Seattle, Washington, USA
| | - Sheetal Sawant
- Duke Human Vaccine Institute, Duke University School of Medicine, Durham, North Carolina, USA
- Department of Medicine, Duke University School of Medicine, Durham, North Carolina, USA
| | - Peter Hraber
- Theoretical Biology and Biophysics, Los Alamos National Laboratory, Los Alamos, New Mexico, USA
| | - Xiaoying Shen
- Duke Human Vaccine Institute, Duke University School of Medicine, Durham, North Carolina, USA
- Department of Medicine, Duke University School of Medicine, Durham, North Carolina, USA
| | - Supachai Rerks-Ngarm
- Thailand Ministry of Public Health, Department of Disease Control, Bangkok, Thailand
| | | | | | - Phillip W Berman
- Department of Biomedical Engineering, University of California, Santa Cruz, California, USA
| | - Merlin L Robb
- Henry M. Jackson Foundation for the Advancement of Military Medicine, Bethesda, Maryland, USA and the U.S. Military HIV Research Program, Walter Reed Army Institute of Research, Silver Spring, Maryland, USA
| | - Giuseppe Pantaleo
- Service of Immunology and Allergy, Service of Infectious Diseases, Department of Medicine and Swiss Vaccine Research Institute, Lausanne University Hospital, University of Lausanne, Lausanne, Switzerland
| | | | - Barton F Haynes
- Duke Human Vaccine Institute, Duke University School of Medicine, Durham, North Carolina, USA
- Department of Medicine, Duke University School of Medicine, Durham, North Carolina, USA
- Department of Immunology, Duke University School of Medicine, Durham, North Carolina, USA
| | - S Munir Alam
- Duke Human Vaccine Institute, Duke University School of Medicine, Durham, North Carolina, USA
- Department of Medicine, Duke University School of Medicine, Durham, North Carolina, USA
| | - David C Montefiori
- Duke Human Vaccine Institute, Duke University School of Medicine, Durham, North Carolina, USA
- Department of Surgery, Duke University School of Medicine, Durham, North Carolina, USA
| | - Georgia D Tomaras
- Duke Human Vaccine Institute, Duke University School of Medicine, Durham, North Carolina, USA
- Department of Immunology, Duke University School of Medicine, Durham, North Carolina, USA
- Department of Surgery, Duke University School of Medicine, Durham, North Carolina, USA
- Department of Molecular Genetics and Microbiology, Duke University School of Medicine, Durham, North Carolina, USA
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103
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Martins MA, Watkins DI. What Is the Predictive Value of Animal Models for Vaccine Efficacy in Humans? Rigorous Simian Immunodeficiency Virus Vaccine Trials Can Be Instructive. Cold Spring Harb Perspect Biol 2018; 10:cshperspect.a029504. [PMID: 28348034 DOI: 10.1101/cshperspect.a029504] [Citation(s) in RCA: 20] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
Abstract
Simian immunodeficiency virus (SIV) challenge of rhesus macaques provides an invaluable tool to evaluate the clinical prospects of HIV-1 vaccine concepts. However, as with any animal model of human disease, it is crucial to understand the advantages and limitations of this system to maximize the translational value of SIV vaccine studies. Here, we discuss the importance of assessing the efficacy of vaccine prototypes using stringent SIV challenge regimens that mimic HIV-1 transmission and pathogenesis. We also review some of the cautionary tales of HIV-1 vaccine research because they provide general lessons for the preclinical assessment of vaccine candidates.
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Affiliation(s)
| | - David I Watkins
- Department of Pathology, University of Miami, Miami, Florida 33136
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104
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Immunogenicity of NYVAC Prime-Protein Boost Human Immunodeficiency Virus Type 1 Envelope Vaccination and Simian-Human Immunodeficiency Virus Challenge of Nonhuman Primates. J Virol 2018; 92:JVI.02035-17. [PMID: 29437967 DOI: 10.1128/jvi.02035-17] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/24/2017] [Accepted: 01/23/2018] [Indexed: 11/20/2022] Open
Abstract
A preventive human immunodeficiency virus type 1 (HIV-1) vaccine is an essential part of the strategy to eradicate AIDS. A critical question is whether antibodies that do not neutralize primary isolate (tier 2) HIV-1 strains can protect from infection. In this study, we investigated the ability of an attenuated poxvirus vector (NYVAC) prime-envelope gp120 boost to elicit potentially protective antibody responses in a rhesus macaque model of mucosal simian-human immunodeficiency virus (SHIV) infection. NYVAC vector delivery of a group M consensus envelope, trivalent mosaic envelopes, or a natural clade B isolate B.1059 envelope elicited antibodies that mediated neutralization of tier 1 viruses, cellular cytotoxicity, and phagocytosis. None of the macaques made neutralizing antibodies against the tier 2 SHIV SF162P3 used for mucosal challenge. Significant protection from infection was not observed for the three groups of vaccinated macaques compared to unvaccinated macaques, although binding antibody to HIV-1 Env correlated with decreased viremia after challenge. Thus, NYVAC Env prime-gp120 boost vaccination elicited polyfunctional, nonneutralizing antibody responses with minimal protective activity against tier 2 SHIV mucosal challenge.IMPORTANCE The antibody responses that confer protection against HIV-1 infection remain unknown. Polyfunctional antibody responses correlated with time to infection in previous macaque studies. Determining the ability of vaccines to induce these types of responses is critical for understanding how to improve upon the one efficacious human HIV-1 vaccine trial completed thus far. We characterized the antibody responses induced by a NYVAC-protein vaccine and determined the protective capacity of polyfunctional antibody responses in an R5, tier 2 mucosal SHIV infection model.
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105
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Theiler J, Korber B. Graph-based optimization of epitope coverage for vaccine antigen design. Stat Med 2018; 37:181-194. [PMID: 28132437 PMCID: PMC5763320 DOI: 10.1002/sim.7203] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/21/2016] [Revised: 11/10/2016] [Accepted: 11/18/2016] [Indexed: 11/23/2022]
Abstract
Epigraph is a recently developed algorithm that enables the computationally efficient design of single or multi-antigen vaccines to maximize the potential epitope coverage for a diverse pathogen population. Potential epitopes are defined as short contiguous stretches of proteins, comparable in length to T-cell epitopes. This optimal coverage problem can be formulated in terms of a directed graph, with candidate antigens represented as paths that traverse this graph. Epigraph protein sequences can also be used as the basis for designing peptides for experimental evaluation of immune responses in natural infections to highly variable proteins. The epigraph tool suite also enables rapid characterization of populations of diverse sequences from an immunological perspective. Fundamental distance measures are based on immunologically relevant shared potential epitope frequencies, rather than simple Hamming or phylogenetic distances. Here, we provide a mathematical description of the epigraph algorithm, include a comparison of different heuristics that can be used when graphs are not acyclic, and we describe an additional tool we have added to the web-based epigraph tool suite that provides frequency summaries of all distinct potential epitopes in a population. We also show examples of the graphical output and summary tables that can be generated using the epigraph tool suite and explain their content and applications. Published 2017. This article is a U.S. Government work and is in the public domain in the USA. Statistics in Medicine published by John Wiley & Sons Ltd.
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Affiliation(s)
- James Theiler
- Los Alamos National LaboratoryLos Alamos87545NMU.S.A
- New Mexico ConsortiumLos Alamos87545NMU.S.A
| | - Bette Korber
- Los Alamos National LaboratoryLos Alamos87545NMU.S.A
- New Mexico ConsortiumLos Alamos87545NMU.S.A
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106
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Zhou T, Doria-Rose NA, Cheng C, Stewart-Jones GBE, Chuang GY, Chambers M, Druz A, Geng H, McKee K, Kwon YD, O'Dell S, Sastry M, Schmidt SD, Xu K, Chen L, Chen RE, Louder MK, Pancera M, Wanninger TG, Zhang B, Zheng A, Farney SK, Foulds KE, Georgiev IS, Joyce MG, Lemmin T, Narpala S, Rawi R, Soto C, Todd JP, Shen CH, Tsybovsky Y, Yang Y, Zhao P, Haynes BF, Stamatatos L, Tiemeyer M, Wells L, Scorpio DG, Shapiro L, McDermott AB, Mascola JR, Kwong PD. Quantification of the Impact of the HIV-1-Glycan Shield on Antibody Elicitation. Cell Rep 2018; 19:719-732. [PMID: 28445724 DOI: 10.1016/j.celrep.2017.04.013] [Citation(s) in RCA: 139] [Impact Index Per Article: 23.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/24/2016] [Revised: 03/02/2017] [Accepted: 04/05/2017] [Indexed: 12/17/2022] Open
Abstract
While the HIV-1-glycan shield is known to shelter Env from the humoral immune response, its quantitative impact on antibody elicitation has been unclear. Here, we use targeted deglycosylation to measure the impact of the glycan shield on elicitation of antibodies against the CD4 supersite. We engineered diverse Env trimers with select glycans removed proximal to the CD4 supersite, characterized their structures and glycosylation, and immunized guinea pigs and rhesus macaques. Immunizations yielded little neutralization against wild-type viruses but potent CD4-supersite neutralization (titers 1: >1,000,000 against four-glycan-deleted autologous viruses with over 90% breadth against four-glycan-deleted heterologous strains exhibiting tier 2 neutralization character). To a first approximation, the immunogenicity of the glycan-shielded protein surface was negligible, with Env-elicited neutralization (ID50) proportional to the exponential of the protein-surface area accessible to antibody. Based on these high titers and exponential relationship, we propose site-selective deglycosylated trimers as priming immunogens to increase the frequency of site-targeting antibodies.
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Affiliation(s)
- Tongqing Zhou
- Vaccine Research Center, National Institute of Allergy and Infectious Diseases, National Institutes of Health, Bethesda, MD 20892, USA
| | - Nicole A Doria-Rose
- Vaccine Research Center, National Institute of Allergy and Infectious Diseases, National Institutes of Health, Bethesda, MD 20892, USA
| | - Cheng Cheng
- Vaccine Research Center, National Institute of Allergy and Infectious Diseases, National Institutes of Health, Bethesda, MD 20892, USA
| | - Guillaume B E Stewart-Jones
- Vaccine Research Center, National Institute of Allergy and Infectious Diseases, National Institutes of Health, Bethesda, MD 20892, USA
| | - Gwo-Yu Chuang
- Vaccine Research Center, National Institute of Allergy and Infectious Diseases, National Institutes of Health, Bethesda, MD 20892, USA
| | - Michael Chambers
- Vaccine Research Center, National Institute of Allergy and Infectious Diseases, National Institutes of Health, Bethesda, MD 20892, USA
| | - Aliaksandr Druz
- Vaccine Research Center, National Institute of Allergy and Infectious Diseases, National Institutes of Health, Bethesda, MD 20892, USA
| | - Hui Geng
- Vaccine Research Center, National Institute of Allergy and Infectious Diseases, National Institutes of Health, Bethesda, MD 20892, USA
| | - Krisha McKee
- Vaccine Research Center, National Institute of Allergy and Infectious Diseases, National Institutes of Health, Bethesda, MD 20892, USA
| | - Young Do Kwon
- Vaccine Research Center, National Institute of Allergy and Infectious Diseases, National Institutes of Health, Bethesda, MD 20892, USA
| | - Sijy O'Dell
- Vaccine Research Center, National Institute of Allergy and Infectious Diseases, National Institutes of Health, Bethesda, MD 20892, USA
| | - Mallika Sastry
- Vaccine Research Center, National Institute of Allergy and Infectious Diseases, National Institutes of Health, Bethesda, MD 20892, USA
| | - Stephen D Schmidt
- Vaccine Research Center, National Institute of Allergy and Infectious Diseases, National Institutes of Health, Bethesda, MD 20892, USA
| | - Kai Xu
- Vaccine Research Center, National Institute of Allergy and Infectious Diseases, National Institutes of Health, Bethesda, MD 20892, USA
| | - Lei Chen
- Vaccine Research Center, National Institute of Allergy and Infectious Diseases, National Institutes of Health, Bethesda, MD 20892, USA
| | - Rita E Chen
- Vaccine Research Center, National Institute of Allergy and Infectious Diseases, National Institutes of Health, Bethesda, MD 20892, USA
| | - Mark K Louder
- Vaccine Research Center, National Institute of Allergy and Infectious Diseases, National Institutes of Health, Bethesda, MD 20892, USA
| | - Marie Pancera
- Vaccine Research Center, National Institute of Allergy and Infectious Diseases, National Institutes of Health, Bethesda, MD 20892, USA
| | - Timothy G Wanninger
- Vaccine Research Center, National Institute of Allergy and Infectious Diseases, National Institutes of Health, Bethesda, MD 20892, USA
| | - Baoshan Zhang
- Vaccine Research Center, National Institute of Allergy and Infectious Diseases, National Institutes of Health, Bethesda, MD 20892, USA
| | - Anqi Zheng
- Vaccine Research Center, National Institute of Allergy and Infectious Diseases, National Institutes of Health, Bethesda, MD 20892, USA
| | - S Katie Farney
- Vaccine Research Center, National Institute of Allergy and Infectious Diseases, National Institutes of Health, Bethesda, MD 20892, USA
| | - Kathryn E Foulds
- Vaccine Research Center, National Institute of Allergy and Infectious Diseases, National Institutes of Health, Bethesda, MD 20892, USA
| | - Ivelin S Georgiev
- Vaccine Research Center, National Institute of Allergy and Infectious Diseases, National Institutes of Health, Bethesda, MD 20892, USA
| | - M Gordon Joyce
- Vaccine Research Center, National Institute of Allergy and Infectious Diseases, National Institutes of Health, Bethesda, MD 20892, USA
| | - Thomas Lemmin
- Vaccine Research Center, National Institute of Allergy and Infectious Diseases, National Institutes of Health, Bethesda, MD 20892, USA
| | - Sandeep Narpala
- Vaccine Research Center, National Institute of Allergy and Infectious Diseases, National Institutes of Health, Bethesda, MD 20892, USA
| | - Reda Rawi
- Vaccine Research Center, National Institute of Allergy and Infectious Diseases, National Institutes of Health, Bethesda, MD 20892, USA
| | - Cinque Soto
- Vaccine Research Center, National Institute of Allergy and Infectious Diseases, National Institutes of Health, Bethesda, MD 20892, USA
| | - John-Paul Todd
- Vaccine Research Center, National Institute of Allergy and Infectious Diseases, National Institutes of Health, Bethesda, MD 20892, USA
| | - Chen-Hsiang Shen
- Vaccine Research Center, National Institute of Allergy and Infectious Diseases, National Institutes of Health, Bethesda, MD 20892, USA
| | - Yaroslav Tsybovsky
- Electron Microscopy Laboratory, Cancer Research Technology Program, Leidos Biomedical Research, Inc., Frederick National Laboratory for Cancer Research, Frederick, MD 21702-1201, USA
| | - Yongping Yang
- Vaccine Research Center, National Institute of Allergy and Infectious Diseases, National Institutes of Health, Bethesda, MD 20892, USA
| | - Peng Zhao
- Complex Carbohydrate Research Center, University of Georgia, Athens, GA 30602, USA; Department of Biochemistry and Molecular Biology, University of Georgia, Athens, GA 30602, USA
| | - Barton F Haynes
- Duke Human Vaccine Institute, Duke University School of Medicine, Durham, NC 27710, USA
| | - Leonidas Stamatatos
- Vaccine and Infectious Disease Division, Fred Hutchinson Cancer Research Center, 1100 Fairview Avenue N, P.O. Box 19024, Seattle, WA 98109, USA
| | - Michael Tiemeyer
- Complex Carbohydrate Research Center, University of Georgia, Athens, GA 30602, USA; Department of Biochemistry and Molecular Biology, University of Georgia, Athens, GA 30602, USA
| | - Lance Wells
- Complex Carbohydrate Research Center, University of Georgia, Athens, GA 30602, USA
| | - Diana G Scorpio
- Vaccine Research Center, National Institute of Allergy and Infectious Diseases, National Institutes of Health, Bethesda, MD 20892, USA
| | - Lawrence Shapiro
- Vaccine Research Center, National Institute of Allergy and Infectious Diseases, National Institutes of Health, Bethesda, MD 20892, USA; Department of Biochemistry and Molecular Biophysics, Columbia University, New York, NY 10032, USA; Department of Systems Biology, Columbia University, New York, NY 10032, USA
| | - Adrian B McDermott
- Vaccine Research Center, National Institute of Allergy and Infectious Diseases, National Institutes of Health, Bethesda, MD 20892, USA
| | - John R Mascola
- Vaccine Research Center, National Institute of Allergy and Infectious Diseases, National Institutes of Health, Bethesda, MD 20892, USA.
| | - Peter D Kwong
- Vaccine Research Center, National Institute of Allergy and Infectious Diseases, National Institutes of Health, Bethesda, MD 20892, USA; Department of Biochemistry and Molecular Biophysics, Columbia University, New York, NY 10032, USA.
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107
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Tachibana S, Sasaki M, Tanaka T, Inoue M, Ophinni Y, Kotaki T, Kameoka M. A 2-4-Amino Acid Deletion in the V5 Region of HIV-1 Env gp120 Confers Viral Resistance to the Broadly Neutralizing Human Monoclonal Antibody, VRC01. AIDS Res Hum Retroviruses 2017; 33:1248-1257. [PMID: 28903577 DOI: 10.1089/aid.2017.0063] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022] Open
Abstract
The envelope glycoprotein (Env) gp120 of human immunodeficiency virus type 1 (HIV-1) plays a critical role in viral entry into host cells. The broadly neutralizing human monoclonal antibody VRC01, which recognizes the CD4 binding site on gp120, neutralizes more than 90% of HIV-1 isolates. However, some of the CRF01_AE viruses prevalent in Southeast Asia are resistant to VRC01-mediated neutralization. We previously reported that 3 amino acid residues at positions 185, 186, and 197 of gp120 played an important role in the VRC01 resistance of CRF01_AE Env (AE-Env) clones isolated from HIV-infected Thai individuals. However, the VRC01 susceptibility of AE-Env clones was not fully explained by mutations at these 3 residues. In the present study, we examined other factors involved in the acquisition of viral VRC01 resistance. Neutralization tests using lentiviral vectors expressing a series of mutant AE-Env clones revealed that the deletion of 2-4 amino acid residues on the loop structure in the V5 region of gp120 conferred VRC01 resistance to several AE-Env clones. Our results provide novel insights into the mechanisms underlying viral VRC01 resistance.
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Affiliation(s)
- Shingo Tachibana
- Department of International Health, Kobe University Graduate School of Health Sciences, Kobe University, Kobe, Japan
| | - Maho Sasaki
- Department of International Health, Kobe University Graduate School of Health Sciences, Kobe University, Kobe, Japan
| | - Takako Tanaka
- Medical Technology Major, Kobe University School of Medicine Faculty of Health Sciences, School of Medicine, Kobe University, Kobe, Japan
| | - Mari Inoue
- Department of International Health, Kobe University Graduate School of Health Sciences, Kobe University, Kobe, Japan
| | - Youdiil Ophinni
- Division of Vaccinology, Center for Infectious Diseases, Kobe University Graduate School of Medicine, Kobe University, Kobe, Japan
| | - Tomohiro Kotaki
- Department of International Health, Kobe University Graduate School of Health Sciences, Kobe University, Kobe, Japan
| | - Masanori Kameoka
- Department of International Health, Kobe University Graduate School of Health Sciences, Kobe University, Kobe, Japan
- Division of Vaccinology, Center for Infectious Diseases, Kobe University Graduate School of Medicine, Kobe University, Kobe, Japan
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108
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Sources of Variation in Ancestral Sequence Reconstruction for HIV-1 Envelope Genes. Evol Bioinform Online 2017. [DOI: 10.1177/117693430600200027] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
Abstract
We characterized the variation in the reconstructed ancestor of 118 HIV-1 envelope gene sequences arising from the methods used for (a) estimating and (b) rooting the phylogenetic tree, and (c) reconstructing the ancestor on that tree, from (d) the sequence format, and from (e) the number of input sequences. The method of rooting the tree was responsible for most of the sequence variation both among the reconstructed ancestral sequences and between the ancestral and observed sequences. Variation in predicted 3-D structural properties of the ancestors mirrored their sequence variation. The observed sequence consensus and ancestral sequences from center-rooted trees were most similar in all predicted attributes. Only for the predicted number of N-glycosylation sites was there a difference between MP and ML methods of reconstruction. Taxon sampling effects were observed only for outgroup-rooted trees, not center-rooted, reflecting the occurrence of several divergent basal sequences. Thus, for sequences exhibiting a radial phylogenetic tree, as does HIV-1, most of the variation in the estimated ancestor arises from the method of rooting the phylogenetic tree. Those investigating the ancestors of genes exhibiting such a radial tree should pay particular attention to alternate rooting methods in order to obtain a representative sample of ancestors.
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109
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Yaseen MM, Abuharfeil NM, Alqudah MA, Yaseen MM. Mechanisms and Factors That Drive Extensive Human Immunodeficiency Virus Type-1 Hypervariability: An Overview. Viral Immunol 2017; 30:708-726. [PMID: 29064351 DOI: 10.1089/vim.2017.0065] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022] Open
Abstract
The extensive hypervariability of human immunodeficiency virus type-1 (HIV-1) populations represents a major barrier against the success of currently available antiretroviral therapy. Moreover, it is still the most important obstacle that faces the development of an effective preventive vaccine against this infectious virus. Indeed, several factors can drive such hypervariability within and between HIV-1 patients. These factors include: first, the very low fidelity nature of HIV-1 reverse transcriptase; second, the extremely high HIV-1 replication rate; and third, the high genomic recombination rate that the virus has. All these factors together with the APOBEC3 proteins family and the immune and antiviral drugs pressures drive the extensive hypervariability of HIV-1 populations. Studying these factors and the mechanisms that drive such hypervariability will provide valuable insights that may guide the development of effective therapeutic and preventive strategies against HIV-1 infection in the near future. To this end, in this review, we summarized recent advances in this area of HIV-1 research.
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Affiliation(s)
- Mahmoud Mohammad Yaseen
- 1 Department of Medical Laboratory Sciences, College of Applied Medical Sciences, Jordan University of Science and Technology , Irbid, Jordan
| | - Nizar Mohammad Abuharfeil
- 2 Department of Applied Biological Sciences, College of Science and Arts, Jordan University of Science and Technology , Irbid, Jordan
| | - Mohammad Ali Alqudah
- 3 Department of Clinical Pharmacy, College of Pharmacy, Jordan University of Science and Technology , Irbid, Jordan
| | - Mohammad Mahmoud Yaseen
- 4 Department of Public Health, College of Medicine, Jordan University of Science and Technology , Irbid, Jordan
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110
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Jia M, Shaw T, Zhang X, Liu D, Shen Y, Ezeamama AE, Yang C, Zhang M. Decoding noises in HIV computational genotyping. Virology 2017; 511:249-255. [PMID: 28918303 DOI: 10.1016/j.virol.2017.08.031] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/18/2017] [Revised: 08/22/2017] [Accepted: 08/23/2017] [Indexed: 10/18/2022]
Abstract
Lack of a consistent and reliable genotyping system can critically impede HIV genomic research on pathogenesis, fitness, virulence, drug resistance, and genomic-based healthcare and treatment. At present, mis-genotyping, i.e., background noises in molecular genotyping, and its impact on epidemic surveillance is unknown. For the first time, we present a comprehensive assessment of HIV genotyping quality. HIV sequence data were retrieved from worldwide published records, and subjected to a systematic genotyping assessment pipeline. Results showed that mis-genotyped cases occurred at 4.6% globally, with some regional and high-risk population heterogeneities. Results also revealed a consistent mis-genotyping pattern in gp120 in all studied populations except the group of men who have sex with men. Our study also suggests novel virus diversities in the mis-genotyped cases. Finally, this study reemphasizes the importance of implementing a standardized genotyping pipeline to avoid genotyping disparity and to advance our understanding of virus evolution in various epidemiological settings.
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Affiliation(s)
- MingRui Jia
- Department of Pain Management, Shandong Provincial Hospital Affiliated to Shandong University, 324 Jingwu Road, Jinan, Shandong Province 250021, China; Department of Epidemiology and Biostatistics, University of Georgia, GA 30602, USA
| | - Timothy Shaw
- Department of Epidemiology and Biostatistics, University of Georgia, GA 30602, USA
| | - Xing Zhang
- Diagnostic Imaging center, MD Anderson Cancer Center, Houston, TX 77030, USA
| | - Dong Liu
- Department of Epidemiology and Biostatistics, University of Georgia, GA 30602, USA; Laboratory of Ichthyology, Shanghai Ocean University, Shanghai 201306, China
| | - Ye Shen
- Department of Epidemiology and Biostatistics, University of Georgia, GA 30602, USA
| | - Amara E Ezeamama
- Department of Psychiatry, Michigan State University, MI 48824, USA
| | - Chunfu Yang
- International Laboratory Branch, Division of Global HIV/TB, Center for Global Health, Centers for Diseases Control and Prevention, GA 30333, USA
| | - Ming Zhang
- Department of Epidemiology and Biostatistics, University of Georgia, GA 30602, USA.
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Ahmed Y, Tian M, Gao Y. Development of an anti-HIV vaccine eliciting broadly neutralizing antibodies. AIDS Res Ther 2017; 14:50. [PMID: 28893278 PMCID: PMC5594608 DOI: 10.1186/s12981-017-0178-3] [Citation(s) in RCA: 23] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/07/2017] [Accepted: 08/11/2017] [Indexed: 11/17/2022] Open
Abstract
The extreme HIV diversity posts a great challenge on development of an effective anti-HIV vaccine. To solve this problem, it is crucial to discover an appropriate immunogens and strategies that are able to prevent the transmission of the diverse viruses that are circulating in the world. Even though there have been a number of broadly neutralizing anti-HIV antibodies (bNAbs) been discovered in recent years, induction of such antibodies to date has only been observed in HIV-1 infection. Here, in this mini review, we review the progress in development of HIV vaccine in eliciting broad immune response, especially production of bNAbs, discuss possible strategies, such as polyvalent sequential vaccination, that facilitates B cell maturation leading to bNAb response.
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112
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Cross-Linking of a CD4-Mimetic Miniprotein with HIV-1 Env gp140 Alters Kinetics and Specificities of Antibody Responses against HIV-1 Env in Macaques. J Virol 2017; 91:JVI.00401-17. [PMID: 28490585 PMCID: PMC5599731 DOI: 10.1128/jvi.00401-17] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/16/2017] [Accepted: 05/03/2017] [Indexed: 01/01/2023] Open
Abstract
Evaluation of the epitope specificities, locations (systemic or mucosal), and effector functions of antibodies elicited by novel HIV-1 immunogens engineered to improve exposure of specific epitopes is critical for HIV-1 vaccine development. Utilizing an array of humoral assays, we evaluated the magnitudes, epitope specificities, avidities, and functions of systemic and mucosal immune responses elicited by a vaccine regimen containing Env cross-linked to a CD4-mimetic miniprotein (gp140-M64U1) in rhesus macaques. Cross-linking of gp140 Env to M64U1 resulted in earlier increases of both the magnitude and avidity of the IgG binding response than those with Env protein alone. Notably, IgG binding responses at an early time point correlated with antibody-dependent cellular cytotoxicity (ADCC) function at the peak immunity time point, which was higher for the cross-linked Env group than for the Env group. In addition, the cross-linked Env group developed higher IgG responses against a linear epitope in the gp120 C1 region of the HIV-1 envelope glycoprotein. These data demonstrate that structural modification of the HIV-1 envelope immunogen by cross-linking of gp140 with the CD4-mimetic M64U1 elicited an earlier increase of binding antibody responses and altered the specificity of the IgG responses, correlating with the rise of subsequent antibody-mediated antiviral functions.IMPORTANCE The development of an efficacious HIV-1 vaccine remains a global priority to prevent new cases of HIV-1 infection. Of the six HIV-1 efficacy trials to date, only one has demonstrated partial efficacy, and immune correlate analysis of that trial revealed a role for binding antibodies and antibody Fc-mediated effector functions. New HIV-1 envelope immunogens are being engineered to selectively expose the most vulnerable and conserved sites on the HIV-1 envelope, with the goal of eliciting antiviral antibodies. Evaluation of the humoral responses elicited by these novel immunogen designs in nonhuman primates is critical for understanding how to improve upon immunogen design to inform further testing in human clinical trials. Our results demonstrate that structural modifications of Env that aim to mimic the CD4-bound conformation can result in earlier antibody elicitation, altered epitope specificity, and increased antiviral function postimmunization.
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Abstract
A key unresolved challenge for developing an effective HIV‐1 vaccine is the discovery of strategies to elicit immune responses that are able to cross‐protect against a significant fraction of the diverse viruses that are circulating worldwide. Here, we summarize some of the immunological implications of HIV‐1 diversity, and outline the rationale behind several polyvalent vaccine design strategies that are currently under evaluation. Vaccine‐elicited T‐cell responses, which contribute to the control of HIV‐1 in natural infections, are currently being considered in both prevention and treatment settings. Approaches now in preclinical and human trials include full proteins in novel vectors, concatenated conserved protein regions, and polyvalent strategies that improve coverage of epitope diversity and enhance the cross‐reactivity of responses. While many barriers to vaccine induction of broadly neutralizing antibody (bNAb) responses remain, epitope diversification has emerged as both a challenge and an opportunity. Recent longitudinal studies have traced the emergence of bNAbs in HIV‐1 infection, inspiring novel approaches to recapitulate and accelerate the events that give rise to potent bNAb in vivo. In this review, we have selected two such lineage‐based design strategies to illustrate how such in‐depth analysis can offer conceptual improvements that may bring us closer to an effective vaccine.
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Affiliation(s)
- Bette Korber
- Theoretical Biology and Biophysics, T6, Los Alamos National Laboratory, Los Alamos, NM, USA.,New Mexico Consortium, Los Alamos, NM, USA
| | - Peter Hraber
- Theoretical Biology and Biophysics, T6, Los Alamos National Laboratory, Los Alamos, NM, USA
| | - Kshitij Wagh
- Theoretical Biology and Biophysics, T6, Los Alamos National Laboratory, Los Alamos, NM, USA
| | - Beatrice H Hahn
- Department of Medicine, University of Pennsylvania, Philadelphia, PA, USA.,Department of Microbiology, University of Pennsylvania, Philadelphia, PA, USA
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Tomaras GD, Plotkin SA. Complex immune correlates of protection in HIV-1 vaccine efficacy trials. Immunol Rev 2017; 275:245-261. [PMID: 28133811 DOI: 10.1111/imr.12514] [Citation(s) in RCA: 83] [Impact Index Per Article: 11.9] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
Abstract
Development of an efficacious HIV-1 vaccine is a major priority for improving human health worldwide. Vaccine-mediated protection against human pathogens can be achieved through elicitation of protective innate, humoral, and cellular responses. Identification of specific immune responses responsible for pathogen protection enables vaccine development and provides insights into host defenses against pathogens and the immunological mechanisms that most effectively fight infection. Defining immunological correlates of transmission risk in preclinical and clinical HIV-1 vaccine trials has moved the HIV-1 vaccine development field forward and directed new candidate vaccine development. Immune correlate studies are providing novel hypotheses about immunological mechanisms that may be responsible for preventing HIV-1 acquisition. Recent results from HIV-1 immune correlates work has demonstrated that there are multiple types of immune responses that together, comprise an immune correlate-thus implicating polyfunctional immune control of HIV-1 transmission. An in depth understanding of these complex immunological mechanisms of protection against HIV-1 will accelerate the development of an efficacious HIV-1 vaccine.
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Affiliation(s)
- Georgia D Tomaras
- Departments of Surgery, Immunology, Molecular Genetics and Microbiology, Duke Human Vaccine Institute, Durham, NC, USA
| | - Stanley A Plotkin
- Vaxconsult, Doylestown, PA, USA.,University of Pennsylvania School of Medicine, Philadelphia, PA, USA
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Tarosso LF, Vieira VA, Sauer MM, Tomiyama HI, Kalil J, Kallas EG. Conserved HIV-1 Gag p24 Epitopes Elicit Cellular Immune Responses That Impact Disease Outcome. AIDS Res Hum Retroviruses 2017; 33:832-842. [PMID: 28594230 DOI: 10.1089/aid.2016.0168] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
Abstract
Although the breadth of the human immunodeficiency virus type 1 (HIV-1)-specific cellular immune response and its impact on the control of viral replication have already been addressed, reported data have proven controversial. We hypothesize that the nature of targeted epitopes, rather than the simple breadth or magnitude of responses, correlates with disease outcome. In this study, we explore the occurrence of patterns of Gag p24 recognition among untreated HIV-1-infected patients by identifying the epitopes that compose such patterns and how they distinctly associate with disease progression. Utilizing enzyme-linked immunospot (ELISPOT) interferon gamma (IFN-γ), we screened cellular responses of 27 HIV-1-infected subjects against 15-mer peptides encompassing the whole Gag p24 protein. Obtained data were used to develop a clustering analysis that allowed definition of two groups of individuals with totally distinct patterns of recognition. Although targeted Gag p24 peptides were completely different between the two groups, the breadth and magnitude of the responses were not. Interestingly, viral control and preservation of CD4+ T cells were increased in one group. In addition, we compared genetic conservation of amino acid sequences of the recognized peptides, as well as of the human leucocyte antigen class I (HLA-I)-restricted epitopes within them. Subjects presenting higher control of HIV-1 replication targeted more conserved epitopes, and higher genetic variation was present mainly in anchor residues for HLA-I molecules. We strengthen the existing evidence from cases of HIV-1 infection in humans that, cellular immune responses targeting conserved epitopes, rather than the magnitude and breadth of responses, associate with a better control of viral replication and maintenance of peripheral CD4+ T cell counts.
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Affiliation(s)
- Leandro F. Tarosso
- Division of Clinical Immunology and Allergy, University of São Paulo School of Medicine, São Paulo, Brazil
| | - Vinicius A. Vieira
- Division of Clinical Immunology and Allergy, University of São Paulo School of Medicine, São Paulo, Brazil
| | - Mariana M. Sauer
- Division of Clinical Immunology and Allergy, University of São Paulo School of Medicine, São Paulo, Brazil
| | - Helena I. Tomiyama
- Division of Clinical Immunology and Allergy, University of São Paulo School of Medicine, São Paulo, Brazil
| | - Jorge Kalil
- Division of Clinical Immunology and Allergy, University of São Paulo School of Medicine, São Paulo, Brazil
| | - Esper G. Kallas
- Division of Clinical Immunology and Allergy, University of São Paulo School of Medicine, São Paulo, Brazil
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Buchbinder SP, Grunenberg NA, Sanchez BJ, Seaton KE, Ferrari G, Moody MA, Frahm N, Montefiori DC, Hay CM, Goepfert PA, Baden LR, Robinson HL, Yu X, Gilbert PB, McElrath MJ, Huang Y, Tomaras GD. Immunogenicity of a novel Clade B HIV-1 vaccine combination: Results of phase 1 randomized placebo controlled trial of an HIV-1 GM-CSF-expressing DNA prime with a modified vaccinia Ankara vaccine boost in healthy HIV-1 uninfected adults. PLoS One 2017; 12:e0179597. [PMID: 28727817 PMCID: PMC5519050 DOI: 10.1371/journal.pone.0179597] [Citation(s) in RCA: 23] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/19/2017] [Accepted: 05/30/2017] [Indexed: 12/20/2022] Open
Abstract
Background A phase 1 trial of a clade B HIV vaccine in HIV-uninfected adults evaluated the safety and immunogenicity of a DNA prime co-expressing GM-CSF (Dg) followed by different numbers and intervals of modified vaccinia Ankara Boosts (M). Both vaccines produce virus-like particles presenting membrane-bound Env. Methods Four US sites randomized 48 participants to receiving 1/10th the DNA dose as DgDgMMM given at 0, 2, 4, 6 and 8 months, or full dose DgDgM_M or DgDgMM_M regimens, given at 0, 2, 4, and 8 months, and 0, 2, 4, 6, and 10 months, respectively. Peak immunogenicity was measured 2 weeks post-last vaccination. Results All regimens were well tolerated and safe. Full dose DgDgM_M and DgDgMM_M regimens generated Env-specific IgG to HIV-1 Env in >90%, IgG3 in >80%, and IgA in <20% of participants. Responses to gp140 and gp41 targets were more common and of higher magnitude than to gp120 and V1V2. The gp41 antibody included reactivity to the conserved immunodominant region with specificities known to mediate virus capture and phagocytosis and did not cross-react with a panel of intestinal flora antigens. The 3rd dose of MVA increased the avidity of elicited antibody (7.5% to 39%), the ADCC response to Bal gp120 (14% to 64%), and the one-year durability of the IgG3 responses to gp41 by 4-fold (13% vs. 3.5% retention of peak response). The co-expressed GM-CSF did not enhance responses over those in trials testing this vaccine without GM-CSF. Conclusion This DNA/MVA prime-boost regimen induced durable, functional humoral responses that included ADCC, high antibody avidity, and Env IgG1 and IgG3 binding responses to the immunodominant region of gp41. The third, spaced MVA boost improved the overall quality of the antibody response. These products without co-expressed GM-CSF but combined with protein boosts will be considered for efficacy evaluation. Trial registration ClinicalTrials.gov NCT01571960
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Affiliation(s)
- Susan P. Buchbinder
- Bridge HIV, San Francisco Department of Public Health, San Francisco, California, United States of America
- Departments of Medicine, Epidemiology and Biostatistics, University of California, San Francisco, California, United States of America
- * E-mail:
| | - Nicole A. Grunenberg
- Vaccine and Infectious Disease Division, Fred Hutchinson Cancer Research Center, Seattle, Washington, United States of America
| | - Brittany J. Sanchez
- Vaccine and Infectious Disease Division, Fred Hutchinson Cancer Research Center, Seattle, Washington, United States of America
| | - Kelly E. Seaton
- Department of Surgery, Duke Human Vaccine Institute, Durham, North Carolina, United States of America
| | - Guido Ferrari
- Department of Surgery, Duke Human Vaccine Institute, Durham, North Carolina, United States of America
| | - M. Anthony Moody
- Department of Surgery, Duke Human Vaccine Institute, Durham, North Carolina, United States of America
| | - Nicole Frahm
- Vaccine and Infectious Disease Division, Fred Hutchinson Cancer Research Center, Seattle, Washington, United States of America
- Department of Global Health, University of Washington, Seattle, Washington, United States of America
| | - David C. Montefiori
- Department of Surgery, Duke Human Vaccine Institute, Durham, North Carolina, United States of America
| | - Christine M. Hay
- Department of Medicine, University of Rochester Medical Center, Rochester, New York, United States of America
| | - Paul A. Goepfert
- Department of Medicine, University of Alabama, Birmingham, Alabama, United States of America
| | - Lindsey R. Baden
- Department of Medicine, Brigham and Women’s Hospital, Boston, Massachusetts, United States of America
| | | | - Xuesong Yu
- Vaccine and Infectious Disease Division, Fred Hutchinson Cancer Research Center, Seattle, Washington, United States of America
| | - Peter B. Gilbert
- Vaccine and Infectious Disease Division, Fred Hutchinson Cancer Research Center, Seattle, Washington, United States of America
- Department of Biostatistics, University of Washington, Seattle, Washington, United States of America
| | - M. Juliana McElrath
- Vaccine and Infectious Disease Division, Fred Hutchinson Cancer Research Center, Seattle, Washington, United States of America
- Department of Global Health, University of Washington, Seattle, Washington, United States of America
- Department of Medicine, University of Washington, Seattle, Washington, United States of America
| | - Yunda Huang
- Vaccine and Infectious Disease Division, Fred Hutchinson Cancer Research Center, Seattle, Washington, United States of America
- Department of Global Health, University of Washington, Seattle, Washington, United States of America
| | - Georgia D. Tomaras
- Department of Surgery, Duke Human Vaccine Institute, Durham, North Carolina, United States of America
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Makhdoomi MA, Khan L, Kumar S, Aggarwal H, Singh R, Lodha R, Singla M, Das BK, Kabra SK, Luthra K. Evolution of cross-neutralizing antibodies and mapping epitope specificity in plasma of chronic HIV-1-infected antiretroviral therapy-naïve children from India. J Gen Virol 2017; 98:1879-1891. [PMID: 28696188 DOI: 10.1099/jgv.0.000824] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/18/2023] Open
Abstract
Delineating the factors leading to the development of broadly neutralizing antibodies (bnAbs) during natural HIV-1 infection and dissecting their epitope specificities generates useful information for vaccine design. This is the first longitudinal study to assess the plasma-neutralizing antibody response and neutralizing determinants in HIV-1-infected children from India. We enrolled 26 and followed up 20 antiretroviral therapy (ART)-naïve, asymptomatic, chronic HIV-1-infected children. Five (19.2 %) baseline and 10 (50 %) follow-up plasma samples neutralized ≥50 % of subtypes A, B and C tier 2 viruses at an ID50 titre ≥150. A modest improvement in neutralization breadth and potency was observed with time. At baseline, subtype C-specific neutralization predominated (P=0.026); interestingly, follow-up samples exhibited cross-neutralizing activity. Epitope mapping revealed V3C reactive antibodies with significantly increased Max50 binding titres in follow-up samples from five infected children; patient #4's plasma antibodies exhibited V3-directed neutralization. A salient observation was the presence of CD4 binding site (CD4bs)-specific NAbs in patient #18 that improved with time (1.76-fold). The RSC3 wild-type (RSC3WT) protein-depleted plasma eluate of patient #18 demonstrated a more than 50% ID50 decrease in neutralization capacity against five HIV-1 pseudoviruses. Further, the presence of CD4bs-neutralizing determinants in patient #18's plasma was confirmed by the neutralizing activity demonstrated by the CD4bs-directed IgG fraction purified from this plasma, and competition with sCD4 against JRFLgp120, identifying this paediatric donor as a potential candidate for the isolation of CD4bs-directed bnAbs. Overall, we observed a relative increase in plasma-neutralizing activity with time in HIV-1-infected children, which suggests that the bnAbs evolve.
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Affiliation(s)
- Muzamil A Makhdoomi
- Department of Biochemistry, All India Institute of Medical Sciences, New Delhi 110029, India
| | - Lubina Khan
- Department of Biochemistry, All India Institute of Medical Sciences, New Delhi 110029, India
| | - Sanjeev Kumar
- Department of Biochemistry, All India Institute of Medical Sciences, New Delhi 110029, India
| | - Heena Aggarwal
- Department of Biochemistry, All India Institute of Medical Sciences, New Delhi 110029, India
| | - Ravinder Singh
- Department of Pediatrics, All India Institute of Medical Sciences, New Delhi 110029, India
| | - Rakesh Lodha
- Department of Pediatrics, All India Institute of Medical Sciences, New Delhi 110029, India
| | - Mohit Singla
- Department of Pediatrics, All India Institute of Medical Sciences, New Delhi 110029, India
| | - Bimal K Das
- Department of Microbiology, All India Institute of Medical Sciences, New Delhi 110029, India
| | - Sushil K Kabra
- Department of Pediatrics, All India Institute of Medical Sciences, New Delhi 110029, India
| | - Kalpana Luthra
- Department of Biochemistry, All India Institute of Medical Sciences, New Delhi 110029, India
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Inhibition of highly pathogenic avian influenza (HPAI) virus by a peptide derived from vFLIP through its direct destabilization of viruses. Sci Rep 2017; 7:4875. [PMID: 28687749 PMCID: PMC5501782 DOI: 10.1038/s41598-017-04777-4] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/12/2016] [Accepted: 05/22/2017] [Indexed: 01/12/2023] Open
Abstract
The antiviral activities of synthesized Kα2-helix peptide, which was derived from the viral FLICE-like inhibitor protein (vFLIP) of Kaposi's sarcoma-associated herpesvirus (KSHV), against influenza A virus (IAV) were investigated in vitro and in vivo, and mechanisms of action were suggested. In addition to the robust autophagy activity of the Kα2-helix peptide, the present study showed that treatment with the Kα2 peptide fused with the TAT peptide significantly inhibited IAV replication and transmission. Moreover, TAT-Kα2 peptide protected the mice, that were challenged with lethal doses of highly pathogenic influenza A H5N1 or H1N1 viruses. Mechanistically, we found that TAT-Kα2 peptide destabilized the viral membranes, depending on their lipid composition of the viral envelop. In addition to IAV, the Kα2 peptide inhibited infections with enveloped viruses, such as Vesicular Stomatitis Virus (VSV) and Respiratory Syncytial Virus (RSV), without cytotoxicity. These results suggest that TAT-Kα2 peptide is a potential antiviral agent for controlling emerging or re-emerging enveloped viruses, particularly diverse subtypes of IAVs.
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Martins MA, Shin YC, Gonzalez-Nieto L, Domingues A, Gutman MJ, Maxwell HS, Castro I, Magnani DM, Ricciardi M, Pedreño-Lopez N, Bailey V, Betancourt D, Altman JD, Pauthner M, Burton DR, von Bredow B, Evans DT, Yuan M, Parks CL, Ejima K, Allison DB, Rakasz E, Barber GN, Capuano S, Lifson JD, Desrosiers RC, Watkins DI. Vaccine-induced immune responses against both Gag and Env improve control of simian immunodeficiency virus replication in rectally challenged rhesus macaques. PLoS Pathog 2017; 13:e1006529. [PMID: 28732035 PMCID: PMC5540612 DOI: 10.1371/journal.ppat.1006529] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/10/2017] [Revised: 08/02/2017] [Accepted: 07/13/2017] [Indexed: 01/28/2023] Open
Abstract
The ability to control lentivirus replication may be determined, in part, by the extent to which individual viral proteins are targeted by the immune system. Consequently, defining the antigens that elicit the most protective immune responses may facilitate the design of effective HIV-1 vaccines. Here we vaccinated four groups of rhesus macaques with a heterologous vector prime/boost/boost/boost (PBBB) regimen expressing the following simian immunodeficiency virus (SIV) genes: env, gag, vif, rev, tat, and nef (Group 1); env, vif, rev, tat, and nef (Group 2); gag, vif, rev, tat, and nef (Group 3); or vif, rev, tat, and nef (Group 4). Following repeated intrarectal challenges with a marginal dose of the neutralization-resistant SIVmac239 clone, vaccinees in Groups 1-3 became infected at similar rates compared to control animals. Unexpectedly, vaccinees in Group 4 became infected at a slower pace than the other animals, although this difference was not statistically significant. Group 1 exhibited the best post-acquisition virologic control of SIV infection, with significant reductions in both peak and chronic phase viremia. Indeed, 5/8 Group 1 vaccinees had viral loads of less than 2,000 vRNA copies/mL of plasma in the chronic phase. Vaccine regimens that did not contain gag (Group 2), env (Group 3), or both of these inserts (Group 4) were largely ineffective at decreasing viremia. Thus, vaccine-induced immune responses against both Gag and Env appeared to maximize control of immunodeficiency virus replication. Collectively, these findings are relevant for HIV-1 vaccine design as they provide additional insights into which of the lentiviral proteins might serve as the best vaccine immunogens.
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Affiliation(s)
- Mauricio A. Martins
- Department of Pathology, University of Miami, Miami, Florida, United States of America
| | - Young C. Shin
- Department of Pathology, University of Miami, Miami, Florida, United States of America
| | - Lucas Gonzalez-Nieto
- Department of Pathology, University of Miami, Miami, Florida, United States of America
| | - Aline Domingues
- Department of Pathology, University of Miami, Miami, Florida, United States of America
| | - Martin J. Gutman
- Department of Pathology, University of Miami, Miami, Florida, United States of America
| | - Helen S. Maxwell
- Department of Pathology, University of Miami, Miami, Florida, United States of America
| | - Iris Castro
- Department of Pathology, University of Miami, Miami, Florida, United States of America
| | - Diogo M. Magnani
- Department of Pathology, University of Miami, Miami, Florida, United States of America
| | - Michael Ricciardi
- Department of Pathology, University of Miami, Miami, Florida, United States of America
| | - Nuria Pedreño-Lopez
- Department of Pathology, University of Miami, Miami, Florida, United States of America
| | - Varian Bailey
- Department of Pathology, University of Miami, Miami, Florida, United States of America
| | - Dillon Betancourt
- Department of Microbiology and Immunology, University of Miami, Miami, Florida, United States of America
| | - John D. Altman
- Department of Microbiology and Immunology, Emory University, Atlanta, Georgia, United States of America
| | - Matthias Pauthner
- Department of Immunology and Microbiology, IAVI Neutralizing Antibody Center, Center for HIV/AIDS Vaccine Immunology and Immunogen Discovery (CHAVI-ID), The Scripps Research Institute, La Jolla, California, United States of America
| | - Dennis R. Burton
- Department of Immunology and Microbiology, IAVI Neutralizing Antibody Center, Center for HIV/AIDS Vaccine Immunology and Immunogen Discovery (CHAVI-ID), The Scripps Research Institute, La Jolla, California, United States of America
| | - Benjamin von Bredow
- Department of Pathology and Laboratory Medicine, University of Wisconsin–Madison, Madison, Wisconsin, United States of America
| | - David T. Evans
- Department of Pathology and Laboratory Medicine, University of Wisconsin–Madison, Madison, Wisconsin, United States of America
- Wisconsin National Primate Research Center, University of Wisconsin–Madison, Madison, Wisconsin, United States of America
| | - Maoli Yuan
- International AIDS Vaccine Initiative, AIDS Vaccine Design and Development Laboratory, Brooklyn, New York, United States of America
| | - Christopher L. Parks
- International AIDS Vaccine Initiative, AIDS Vaccine Design and Development Laboratory, Brooklyn, New York, United States of America
| | - Keisuke Ejima
- Section on Statistical Genetics, Department of Biostatistics, University of Alabama at Birmingham, Birmingham, Alabama, United States of America
| | - David B. Allison
- Section on Statistical Genetics, Department of Biostatistics, University of Alabama at Birmingham, Birmingham, Alabama, United States of America
| | - Eva Rakasz
- Wisconsin National Primate Research Center, University of Wisconsin–Madison, Madison, Wisconsin, United States of America
| | - Glen N. Barber
- Department of Cell Biology, University of Miami, Miami, Florida, United States of America
| | - Saverio Capuano
- Wisconsin National Primate Research Center, University of Wisconsin–Madison, Madison, Wisconsin, United States of America
| | - Jeffrey D. Lifson
- AIDS and Cancer Virus Program, Leidos Biomedical Research, Inc., Frederick National Laboratory for Cancer Research, Frederick, Maryland, United States of America
| | - Ronald C. Desrosiers
- Department of Pathology, University of Miami, Miami, Florida, United States of America
| | - David I. Watkins
- Department of Pathology, University of Miami, Miami, Florida, United States of America
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Parto S, Lartillot N. Detecting consistent patterns of directional adaptation using differential selection codon models. BMC Evol Biol 2017. [PMID: 28645318 PMCID: PMC5481935 DOI: 10.1186/s12862-017-0979-y] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022] Open
Abstract
BACKGROUND Phylogenetic codon models are often used to characterize the selective regimes acting on protein-coding sequences. Recent methodological developments have led to models explicitly accounting for the interplay between mutation and selection, by modeling the amino acid fitness landscape along the sequence. However, thus far, most of these models have assumed that the fitness landscape is constant over time. Fluctuations of the fitness landscape may often be random or depend on complex and unknown factors. However, some organisms may be subject to systematic changes in selective pressure, resulting in reproducible molecular adaptations across independent lineages subject to similar conditions. RESULTS Here, we introduce a codon-based differential selection model, which aims to detect and quantify the fine-grained consistent patterns of adaptation at the protein-coding level, as a function of external conditions experienced by the organism under investigation. The model parameterizes the global mutational pressure, as well as the site- and condition-specific amino acid selective preferences. This phylogenetic model is implemented in a Bayesian MCMC framework. After validation with simulations, we applied our method to a dataset of HIV sequences from patients with known HLA genetic background. Our differential selection model detects and characterizes differentially selected coding positions specifically associated with two different HLA alleles. CONCLUSION Our differential selection model is able to identify consistent molecular adaptations as a function of repeated changes in the environment of the organism. These models can be applied to many other problems, ranging from viral adaptation to evolution of life-history strategies in plants or animals.
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Affiliation(s)
- Sahar Parto
- Département de Biochimie et Médecine Moléculaire, Centre Robert Cedergren, Bio-Informatique et Génomique, Université de Montréal, Montréal, Québec, Canada.
| | - Nicolas Lartillot
- Laboratoire de Biométrie et Biologie Évolutive, Université Lyon 1, CNRS, UMR 5558, Lyon, France
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Ingemarsdotter CK, Poddar S, Mercier S, Patzel V, Lever AML. Expression of Herpes Simplex Virus Thymidine Kinase/Ganciclovir by RNA Trans-Splicing Induces Selective Killing of HIV-Producing Cells. MOLECULAR THERAPY. NUCLEIC ACIDS 2017; 7:140-154. [PMID: 28624190 PMCID: PMC5415956 DOI: 10.1016/j.omtn.2017.03.004] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 09/19/2016] [Revised: 02/20/2017] [Accepted: 03/07/2017] [Indexed: 02/07/2023]
Abstract
Antiviral strategies targeting hijacked cellular processes are less easily evaded by the virus than viral targets. If selective for viral functions, they can have a high therapeutic index. We used RNA trans-splicing to deliver the herpes simplex virus thymidine kinase-ganciclovir (HSV-tk/GCV) cell suicide system into HIV-producing cells. Using an extensive in silico bioinformatics and RNA structural analysis approach, ten HIV RNA trans-splicing constructs were designed targeting eight different HIV splice donor or acceptor sites and were tested in cells expressing HIV. Trans-spliced mRNAs were identified in HIV-expressing cells using qRT-PCR with successful detection of fusion RNA transcripts between HIV RNA and the HSV-tk RNA transcripts from six of ten candidate RNA trans-splicing constructs. Conventional PCR and Sanger sequencing confirmed RNA trans-splicing junctions. Measuring cell viability in the presence or absence of GCV expression of HSV-tk by RNA trans-splicing led to selective killing of HIV-producing cells using either 3' exon replacement or 5' exon replacement in the presence of GCV. Five constructs targeting four HIV splice donor and acceptor sites, D4, A5, A7, and A8, involved in regulating the generation of multiple HIV RNA transcripts proved to be effective for trans-splicing mediated selective killing of HIV-infected cells, within which individual constructs targeting D4 and A8 were the most efficient.
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Affiliation(s)
- Carin K Ingemarsdotter
- Department of Medicine, Addenbrooke's Hospital, University of Cambridge, Cambridge CB2 0QQ, UK
| | - Sushmita Poddar
- Department of Microbiology & Immunology, Yong Loo Lin School of Medicine, National University of Singapore, 5 Science Drive 2, Singapore 117545, Singapore
| | - Sarah Mercier
- Department of Medicine, Addenbrooke's Hospital, University of Cambridge, Cambridge CB2 0QQ, UK
| | - Volker Patzel
- Department of Medicine, Addenbrooke's Hospital, University of Cambridge, Cambridge CB2 0QQ, UK; Department of Microbiology & Immunology, Yong Loo Lin School of Medicine, National University of Singapore, 5 Science Drive 2, Singapore 117545, Singapore
| | - Andrew M L Lever
- Department of Medicine, Addenbrooke's Hospital, University of Cambridge, Cambridge CB2 0QQ, UK.
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Sharma U, Gupta P, Singhal M, Singh S, Gupta S, Venkatesh S, Rai A, Husain M. Comparative genetic variability in HIV-1 subtype C nef gene in early age groups of infants. J Med Virol 2017; 89:1606-1619. [PMID: 28370302 DOI: 10.1002/jmv.24820] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/27/2016] [Accepted: 03/24/2017] [Indexed: 11/06/2022]
Abstract
Targeting properties of vertically transmitted viruses in early infancy is important to understand disease progression. To investigate genotypic characteristics of transmitted viruses, blood samples were obtained from infants aged 6 weeks-18 months, categorized in two age groups, acute (<6 months) and early (>6-18 months). Nef having an important role in pathogenesis was selected to explore the viral characteristics. A total of 57 PCR positive samples, amplified by nef gene were sequenced. Analysis showed that 50 sequences belonged to subtype C. In one sequence of acute age group, a long insertion of 10 residues (AAERMRRAEP) in variable region and a 13 residues deletion (ATNNADCAWLEAQ) around proteolytic cleavage region of gene in another sequence was observed. Insertions were also observed in sequences of early age group, however, they ranged from two to eight residues only. In one sequence of early age group, 3/4 arginines at positions 19, 21, 22 of arginine cluster were mutated to glutamine, alanine, and glutamine, respectively. Entropy analysis of two age groups revealed presence of several residues with statistically significant differences in their variability. Among these, 15 (R18,R23,R24; A66,L68,Q71; E74,E77,E78; V87,M92; R119, P144, E167, and C176) belonged to functional motifs, out of which, 12 were in acute age group, suggesting that variability was greater in this group. Prediction of HLA binding peptide motif revealed that epitope LTFGWCFKL was present in >80% study sequences. This epitope was also present in maximum number of HLA types circulating in India and vaccine candidate sequences, suggesting that it may be helpful in designing an epitope-based vaccine.
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Affiliation(s)
- Uma Sharma
- Molecular Virology Laboratory, Department of Biotechnology, Jamia Millia Islamia, New Delhi, India.,National Centre for Disease Control, Directorate General of Health Services, Ministry of Health and Family Welfare, Government of India, Delhi, India
| | - Poonam Gupta
- Molecular Virology Laboratory, Department of Biotechnology, Jamia Millia Islamia, New Delhi, India
| | - Megha Singhal
- National Centre for Disease Control, Directorate General of Health Services, Ministry of Health and Family Welfare, Government of India, Delhi, India
| | - Supriya Singh
- National Centre for Disease Control, Directorate General of Health Services, Ministry of Health and Family Welfare, Government of India, Delhi, India
| | - Sunil Gupta
- National Centre for Disease Control, Directorate General of Health Services, Ministry of Health and Family Welfare, Government of India, Delhi, India
| | - Srinivas Venkatesh
- National Centre for Disease Control, Directorate General of Health Services, Ministry of Health and Family Welfare, Government of India, Delhi, India
| | - Arvind Rai
- National Centre for Disease Control, Directorate General of Health Services, Ministry of Health and Family Welfare, Government of India, Delhi, India
| | - Mohammad Husain
- Molecular Virology Laboratory, Department of Biotechnology, Jamia Millia Islamia, New Delhi, India
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123
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Chuang GY, Geng H, Pancera M, Xu K, Cheng C, Acharya P, Chambers M, Druz A, Tsybovsky Y, Wanninger TG, Yang Y, Doria-Rose NA, Georgiev IS, Gorman J, Joyce MG, O'Dell S, Zhou T, McDermott AB, Mascola JR, Kwong PD. Structure-Based Design of a Soluble Prefusion-Closed HIV-1 Env Trimer with Reduced CD4 Affinity and Improved Immunogenicity. J Virol 2017; 91:e02268-16. [PMID: 28275193 PMCID: PMC5411596 DOI: 10.1128/jvi.02268-16] [Citation(s) in RCA: 72] [Impact Index Per Article: 10.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/21/2016] [Accepted: 03/03/2017] [Indexed: 01/09/2023] Open
Abstract
The HIV-1 envelope (Env) trimer is a target for vaccine design as well as a conformational machine that facilitates virus entry by transitioning between prefusion-closed, CD4-bound, and coreceptor-bound conformations by transitioning into a postfusion state. Vaccine designers have sought to restrict the conformation of the HIV-1 Env trimer to its prefusion-closed state as this state is recognized by most broadly neutralizing, but not nonneutralizing, antibodies. We previously identified a disulfide bond, I201C-A433C (DS), which stabilizes Env in the vaccine-desired prefusion-closed state. When placed into the context of BG505 SOSIP.664, a soluble Env trimer mimic developed by Sanders, Moore, and colleagues, the engineered DS-SOSIP trimer showed reduced conformational triggering by CD4. Here, we further stabilize DS-SOSIP through a combination of structure-based design and 96-well-based expression and antigenic assessment. From 103 designs, we identified one, named DS-SOSIP.4mut, with four additional mutations at the interface of potentially mobile domains of the prefusion-closed structure. We also determined the crystal structures of DS-SOSIP.4mut at 4.1-Å resolution and of an additional DS-SOSIP.6mut variant at 4.3-Å resolution, and these confirmed the formation of engineered disulfide bonds. Notably, DS-SOSIP.4mut elicited a higher ratio of tier 2 autologous titers versus tier 1 V3-sensitive titers than BG505 SOSIP.664. DS-SOSIP.4mut also showed reduced recognition of CD4 and increased thermostability. The improved antigenicity, thermostability, and immunogenicity of DS-SOSIP.4mut suggest utility as an immunogen or a serologic probe; moreover, the specific four alterations identified here, M154, M300, M302, and L320 (4mut), can also be transferred to other HIV-1 Env trimers of interest to improve their properties.IMPORTANCE One approach to elicit broadly neutralizing antibodies against HIV-1 is to stabilize the structurally flexible HIV-1 envelope (Env) trimer in a conformation that displays predominantly broadly neutralizing epitopes and few to no nonneutralizing epitopes. The prefusion-closed conformation of HIV-1 Env has been identified as one such preferred conformation, and a current leading vaccine candidate is the BG505 DS-SOSIP variant, comprising two disulfides and an Ile-to-Pro mutation of Env from strain BG505. Here, we introduced additional mutations to further stabilize BG505 DS-SOSIP in the vaccine-preferred prefusion-closed conformation. In guinea pigs, our best mutant, DS-SOSIP.4mut, elicited a significantly higher ratio of autologous versus V3-directed neutralizing antibody responses than the SOSIP-stabilized form. We also observed an improvement in thermostability and a reduction in CD4 affinity. With improved antigenicity, stability, and immunogenicity, DS-SOSIP.4mut-stabilized trimers may have utility as HIV-1 immunogens or in other antigen-specific contexts, such as with B-cell probes.
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Affiliation(s)
- Gwo-Yu Chuang
- Vaccine Research Center, National Institute of Allergy and Infectious Diseases, National Institutes of Health, Bethesda, Maryland, USA
| | - Hui Geng
- Vaccine Research Center, National Institute of Allergy and Infectious Diseases, National Institutes of Health, Bethesda, Maryland, USA
| | - Marie Pancera
- Vaccine Research Center, National Institute of Allergy and Infectious Diseases, National Institutes of Health, Bethesda, Maryland, USA
| | - Kai Xu
- Vaccine Research Center, National Institute of Allergy and Infectious Diseases, National Institutes of Health, Bethesda, Maryland, USA
| | - Cheng Cheng
- Vaccine Research Center, National Institute of Allergy and Infectious Diseases, National Institutes of Health, Bethesda, Maryland, USA
| | - Priyamvada Acharya
- Vaccine Research Center, National Institute of Allergy and Infectious Diseases, National Institutes of Health, Bethesda, Maryland, USA
| | - Michael Chambers
- Vaccine Research Center, National Institute of Allergy and Infectious Diseases, National Institutes of Health, Bethesda, Maryland, USA
| | - Aliaksandr Druz
- Vaccine Research Center, National Institute of Allergy and Infectious Diseases, National Institutes of Health, Bethesda, Maryland, USA
| | - Yaroslav Tsybovsky
- Electron Microscopy Laboratory, Cancer Research Technology Program, Leidos Biomedical Research, Inc., Frederick National Laboratory for Cancer Research, Frederick, Maryland, USA
| | - Timothy G Wanninger
- Vaccine Research Center, National Institute of Allergy and Infectious Diseases, National Institutes of Health, Bethesda, Maryland, USA
| | - Yongping Yang
- Vaccine Research Center, National Institute of Allergy and Infectious Diseases, National Institutes of Health, Bethesda, Maryland, USA
| | - Nicole A Doria-Rose
- Vaccine Research Center, National Institute of Allergy and Infectious Diseases, National Institutes of Health, Bethesda, Maryland, USA
| | - Ivelin S Georgiev
- Vaccine Research Center, National Institute of Allergy and Infectious Diseases, National Institutes of Health, Bethesda, Maryland, USA
| | - Jason Gorman
- Vaccine Research Center, National Institute of Allergy and Infectious Diseases, National Institutes of Health, Bethesda, Maryland, USA
| | - M Gordon Joyce
- Vaccine Research Center, National Institute of Allergy and Infectious Diseases, National Institutes of Health, Bethesda, Maryland, USA
| | - Sijy O'Dell
- Vaccine Research Center, National Institute of Allergy and Infectious Diseases, National Institutes of Health, Bethesda, Maryland, USA
| | - Tongqing Zhou
- Vaccine Research Center, National Institute of Allergy and Infectious Diseases, National Institutes of Health, Bethesda, Maryland, USA
| | - Adrian B McDermott
- Vaccine Research Center, National Institute of Allergy and Infectious Diseases, National Institutes of Health, Bethesda, Maryland, USA
| | - John R Mascola
- Vaccine Research Center, National Institute of Allergy and Infectious Diseases, National Institutes of Health, Bethesda, Maryland, USA
| | - Peter D Kwong
- Vaccine Research Center, National Institute of Allergy and Infectious Diseases, National Institutes of Health, Bethesda, Maryland, USA
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Novel, in-natural-infection subdominant HIV-1 CD8+ T-cell epitopes revealed in human recipients of conserved-region T-cell vaccines. PLoS One 2017; 12:e0176418. [PMID: 28448594 PMCID: PMC5407754 DOI: 10.1371/journal.pone.0176418] [Citation(s) in RCA: 25] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/02/2017] [Accepted: 04/10/2017] [Indexed: 01/25/2023] Open
Abstract
BACKGROUND Fine definition of targeted CD8+ T-cell epitopes and their human leucocyte antigen (HLA) class I restriction informs iterative improvements of HIV-1 T-cell vaccine designs and may predict early vaccine success or failure. Here, lymphocytes from volunteers, who had received candidate HIVconsv vaccines expressing conserved sub-protein regions of HIV-1, were used to define the optimum-length target epitopes and their HLA restriction. In HIV-1-positive patients, CD8+ T-cell responses predominantly recognize immunodominant, but hypervariable and therefore less protective epitopes. The less variable, more protective epitopes in conserved regions are typically subdominant. Therefore, induction of strong responses to conserved regions by vaccination provides an opportunity to discover novel important epitopes. METHODS Cryopreserved lymphocytes from vaccine recipients were expanded by stimulation with 15-mer responder peptides for 10 days to establish short term-cell-line (STCL) effector cells. These were subjected to intracellular cytokine staining using serially truncated peptides and peptide-pulsed 721.221 cells expressing individual HLA class I alleles to define minimal epitope length and HLA restriction by stimulation of IFN-γ and TNF-α production and surface expression of CD107a. RESULTS Using lymphocyte samples of 12 vaccine recipients, we defined 14 previously unreported optimal CD8+ T-cell HIV-1 epitopes and their four-digit HLA allele restriction (6 HLA-A, 7 HLA-B and 1 HLA-C alleles). Further 13 novel targets with incomplete information were revealed. CONCLUSIONS The high rate of discovery of novel CD8+ T-cell effector epitopes warrants further epitope mining in recipients of the conserved-region vaccines in other populations and informs development of HIV-1/AIDS vaccines. TRIAL REGISTRATION ClinicalTrials.gov NCT01151319.
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Superiority in Rhesus Macaques of Targeting HIV-1 Env gp140 to CD40 versus LOX-1 in Combination with Replication-Competent NYVAC-KC for Induction of Env-Specific Antibody and T Cell Responses. J Virol 2017; 91:JVI.01596-16. [PMID: 28202751 DOI: 10.1128/jvi.01596-16] [Citation(s) in RCA: 27] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/17/2016] [Accepted: 01/13/2017] [Indexed: 01/13/2023] Open
Abstract
We compared the HIV-1-specific immune responses generated by targeting HIV-1 envelope protein (Env gp140) to either CD40 or LOX-1, two endocytic receptors on dendritic cells (DCs), in rhesus macaques primed with a poxvirus vector (NYVAC-KC) expressing Env gp140. The DC-targeting vaccines, humanized recombinant monoclonal antibodies fused to Env gp140, were administered as a boost with poly-ICLC adjuvant either alone or coadministered with the NYVAC-KC vector. All the DC-targeting vaccine administrations with poly-ICLC increased the low-level serum anti-Env IgG responses elicited by NYVAC-KC priming significantly more (up to a P value of 0.01) than in a group without poly-ICLC. The responses were robust and cross-reactive and contained antibodies specific to multiple epitopes within gp140, including the C1, C2, V1, V2, and V3, C4, C5, and gp41 immunodominant regions. The DC-targeting vaccines also elicited modest serum Env-specific IgA responses. All groups gave serum neutralization activity limited to tier 1 viruses and antibody-dependent cytotoxicity responses (ADCC) after DC-targeting boosts. Furthermore, CD4+ and CD8+ T cell responses specific to multiple Env epitopes were strongly boosted by the DC-targeting vaccines plus poly-ICLC. Together, these results indicate that prime-boost immunization via NYVAC-KC and either anti-CD40.Env gp140/poly-ICLC or anti-LOX-1.Env gp140/poly-ICLC induced balanced antibody and T cell responses against HIV-1 Env. Coadministration of NYVAC-KC with the DC-targeting vaccines increased T cell responses but had minimal effects on antibody responses except for suppressing serum IgA responses. Overall, targeting Env to CD40 gave more robust T cell and serum antibody responses with broader epitope representation and greater durability than with LOX-1.IMPORTANCE An effective vaccine to prevent HIV-1 infection does not yet exist. An approach to elicit strong protective antibody development is to direct virus protein antigens specifically to dendritic cells, which are now known to be the key cell type for controlling immunity. In this study, we have tested in nonhuman primates two prototype vaccines engineered to direct the HIV-1 coat protein Env to dendritic cells. These vaccines bind to either CD40 or LOX-1, two dendritic cell surface receptors with different functions and tissue distributions. We tested the vaccines described above in combination with attenuated virus vectors that express Env. Both vaccines, but especially that delivered via CD40, raised robust immunity against HIV-1 as measured by monitoring potentially protective antibody and T cell responses in the blood. The safety and efficacy of the CD40-targeted vaccine justify further development for future human clinical trials.
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DeLeon O, Hodis H, O’Malley Y, Johnson J, Salimi H, Zhai Y, Winter E, Remec C, Eichelberger N, Van Cleave B, Puliadi R, Harrington RD, Stapleton JT, Haim H. Accurate predictions of population-level changes in sequence and structural properties of HIV-1 Env using a volatility-controlled diffusion model. PLoS Biol 2017; 15:e2001549. [PMID: 28384158 PMCID: PMC5383018 DOI: 10.1371/journal.pbio.2001549] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/11/2016] [Accepted: 03/06/2017] [Indexed: 01/08/2023] Open
Abstract
The envelope glycoproteins (Envs) of HIV-1 continuously evolve in the host by random mutations and recombination events. The resulting diversity of Env variants circulating in the population and their continuing diversification process limit the efficacy of AIDS vaccines. We examined the historic changes in Env sequence and structural features (measured by integrity of epitopes on the Env trimer) in a geographically defined population in the United States. As expected, many Env features were relatively conserved during the 1980s. From this state, some features diversified whereas others remained conserved across the years. We sought to identify “clues” to predict the observed historic diversification patterns. Comparison of viruses that cocirculate in patients at any given time revealed that each feature of Env (sequence or structural) exists at a defined level of variance. The in-host variance of each feature is highly conserved among individuals but can vary between different HIV-1 clades. We designate this property “volatility” and apply it to model evolution of features as a linear diffusion process that progresses with increasing genetic distance. Volatilities of different features are highly correlated with their divergence in longitudinally monitored patients. Volatilities of features also correlate highly with their population-level diversification. Using volatility indices measured from a small number of patient samples, we accurately predict the population diversity that developed for each feature over the course of 30 years. Amino acid variants that evolved at key antigenic sites are also predicted well. Therefore, small “fluctuations” in feature values measured in isolated patient samples accurately describe their potential for population-level diversification. These tools will likely contribute to the design of population-targeted AIDS vaccines by effectively capturing the diversity of currently circulating strains and addressing properties of variants expected to appear in the future. HIV-1 is the causative agent of the global AIDS pandemic. The envelope glycoproteins (Envs) of HIV-1 constitute a primary target for antibody-based vaccines. However, the diversity of Envs in the population limits the potential efficacy of this approach. Accurate estimates of the range of variants that currently infect patients and those expected to appear in the future will likely contribute to the design of population-targeted immunogens. We found that different properties (features) of Env have different propensities for small “fluctuations” in their values among viruses that infect patients at any given time point. This propensity of each feature for in-host variance, which we designate “volatility”, is conserved among patients. We apply this parameter to model the evolution of features (in patients and population) as a diffusion process driven by their “diffusion coefficients” (volatilities). Using volatilities measured from a few patient samples from the 1980s, we accurately predict properties of viruses that evolved in the population over the course of 30 years. The diffusion-based model described here efficiently captures evolution of phenotypes in biological systems controlled by a dominant random component.
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Affiliation(s)
- Orlando DeLeon
- Department of Microbiology, Carver College of Medicine, University of Iowa, Iowa City, Iowa, United States of America
| | - Hagit Hodis
- Department of Microbiology, Carver College of Medicine, University of Iowa, Iowa City, Iowa, United States of America
| | - Yunxia O’Malley
- Department of Microbiology, Carver College of Medicine, University of Iowa, Iowa City, Iowa, United States of America
| | - Jacklyn Johnson
- Department of Microbiology, Carver College of Medicine, University of Iowa, Iowa City, Iowa, United States of America
| | - Hamid Salimi
- Department of Microbiology, Carver College of Medicine, University of Iowa, Iowa City, Iowa, United States of America
| | - Yinjie Zhai
- Department of Microbiology, Carver College of Medicine, University of Iowa, Iowa City, Iowa, United States of America
| | - Elizabeth Winter
- Department of Microbiology, Carver College of Medicine, University of Iowa, Iowa City, Iowa, United States of America
| | - Claire Remec
- Department of Microbiology, Carver College of Medicine, University of Iowa, Iowa City, Iowa, United States of America
| | - Noah Eichelberger
- Department of Microbiology, Carver College of Medicine, University of Iowa, Iowa City, Iowa, United States of America
| | - Brandon Van Cleave
- Department of Microbiology, Carver College of Medicine, University of Iowa, Iowa City, Iowa, United States of America
| | - Ramya Puliadi
- Department of Microbiology, Carver College of Medicine, University of Iowa, Iowa City, Iowa, United States of America
| | - Robert D. Harrington
- Center for AIDS Research (CFAR) at the University of Washington, Seattle, Washington, United States of America
| | - Jack T. Stapleton
- Department of Microbiology, Carver College of Medicine, University of Iowa, Iowa City, Iowa, United States of America
- Veterans Affairs Medical Center, Iowa City, Iowa, United States of America
| | - Hillel Haim
- Department of Microbiology, Carver College of Medicine, University of Iowa, Iowa City, Iowa, United States of America
- * E-mail:
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Abstract
An HIV-1 vaccine is needed to curtail the HIV epidemic. Only one (RV144) out of the 6 HIV-1 vaccine efficacy trials performed showed efficacy. A potential mechanism of protection is the induction of functional antibodies to V1V2 region of HIV envelope. The 2 main current approaches to the generation of protective immunity are through broadly neutralizing antibodies (bnAb) and induction of functional antibodies (non-neutralizing Abs with other potential anti-viral functions). Passive immunization using bnAb has advanced into phase II clinical trials. The induction of bnAb using mimics of the natural Env trimer or B-cell lineage vaccine design is still in pre-clinical phase. An attempt at optimization of protective functional antibodies will be assessed next with the efficacy trial (HVTN702) about to start. With on-going optimization of prime/boost strategies, the development of mosaic immunogens, replication competent vectors, and emergence of new strategies designed to induce bnAb, the prospects for a preventive HIV vaccine have never been more promising.
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Affiliation(s)
- Denise C Hsu
- a Armed Forces Research Institute of Medical Sciences , Bangkok , Thailand.,b US Military HIV Research Program , Silver Spring , MD , USA.,c Henry M. Jackson Foundation for the Advancement of Military Medicine , Bethesda , MD , USA
| | - Robert J O'Connell
- a Armed Forces Research Institute of Medical Sciences , Bangkok , Thailand.,b US Military HIV Research Program , Silver Spring , MD , USA
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Wang H, Luo P, Zhu H, Wang N, Hu J, Mo Q, Yang Z, Feng Y. Near Full-Length Genomic Characterization of a Novel HIV-1 Unique Recombinant (CRF55_01B/CRF07_BC) from a Malaysian Immigrant Worker in Zhejiang, China. AIDS Res Hum Retroviruses 2017; 33:275-278. [PMID: 27460422 DOI: 10.1089/aid.2016.0100] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022] Open
Abstract
Recombinant forms contribute substantially to the genetic diversity of human immunodeficiency virus type 1 (HIV-1). Here we report a novel HIV-1 recombinant detected from a comprehensive HIV-1 molecular epidemiologic study among cross-border populations in China. Near full-length genome (NFLG) phylogenetic analysis showed that the novel HIV-1 recombinant ZJCIQ15005, which was isolated from a Malaysian immigrant worker in Zhejiang, China, clustered with CRF55_01B reference sequences but set up a distinct branch. Recombinant analysis showed that the NFLG of ZJCIQ15005 composed of CRF55_01B (as the backbone) and CRF07_BC, with 12 recombinant break points observed in the pol, vif, vpr, tat, rev, env, nef, and 3'LTR regions. This is the first detection of a novel HIV-1 recombinant (CRF55_01B/CRF07_BC) in immigrant workers in China. The emergence of this recombinant may increase the complexity of the HIV-1 epidemic in China and suggests the importance of continuous surveillance of the dynamic changes of HIV-1.
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Affiliation(s)
- Haibo Wang
- Zhuhai International Travel Healthcare Center, Zhuhai, China
| | - Peng Luo
- Zhejiang International Travel Healthcare Center, Hangzhou, China
| | - Hong Zhu
- Beijing International Travel Healthcare Center, Beijing, China
| | - Ningli Wang
- Yunnan International Travel Healthcare Center, Kunming, China
| | - Jing Hu
- State Key Laboratory for Infectious Disease Prevention and Control, National Center for AIDS/STD Control and Prevention, Chinese Center for Disease Control and Prevention, Beijing, China
| | - Qiuhua Mo
- Zhuhai International Travel Healthcare Center, Zhuhai, China
| | - Ze Yang
- Zhuhai International Travel Healthcare Center, Zhuhai, China
| | - Yi Feng
- State Key Laboratory for Infectious Disease Prevention and Control, National Center for AIDS/STD Control and Prevention, Chinese Center for Disease Control and Prevention, Beijing, China
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Sensitive Next-Generation Sequencing Method Reveals Deep Genetic Diversity of HIV-1 in the Democratic Republic of the Congo. J Virol 2017; 91:JVI.01841-16. [PMID: 28077647 PMCID: PMC5331799 DOI: 10.1128/jvi.01841-16] [Citation(s) in RCA: 29] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/12/2016] [Accepted: 12/07/2016] [Indexed: 01/17/2023] Open
Abstract
As the epidemiological epicenter of the human immunodeficiency virus (HIV) pandemic, the Democratic Republic of the Congo (DRC) is a reservoir of circulating HIV strains exhibiting high levels of diversity and recombination. In this study, we characterized HIV specimens collected in two rural areas of the DRC between 2001 and 2003 to identify rare strains of HIV. The env gp41 region was sequenced and characterized for 172 HIV-positive specimens. The env sequences were predominantly subtype A (43.02%), but 7 other subtypes (33.14%), 20 circulating recombinant forms (CRFs; 11.63%), and 20 unclassified (11.63%) sequences were also found. Of the rare and unclassified subtypes, 18 specimens were selected for next-generation sequencing (NGS) by a modified HIV-switching mechanism at the 5' end of the RNA template (SMART) method to obtain full-genome sequences. NGS produced 14 new complete genomes, which included pure subtype C (n = 2), D (n = 1), F1 (n = 1), H (n = 3), and J (n = 1) genomes. The two subtype C genomes and one of the subtype H genomes branched basal to their respective subtype branches but had no evidence of recombination. The remaining 6 genomes were complex recombinants of 2 or more subtypes, including subtypes A1, F, G, H, J, and K and unclassified fragments, including one subtype CRF25 isolate, which branched basal to all CRF25 references. Notably, all recombinant subtype H fragments branched basal to the H clade. Spatial-geographical analysis indicated that the diverse sequences identified here did not expand globally. The full-genome and subgenomic sequences identified in our study population significantly increase the documented diversity of the strains involved in the continually evolving HIV-1 pandemic.IMPORTANCE Very little is known about the ancestral HIV-1 strains that founded the global pandemic, and very few complete genome sequences are available from patients in the Congo Basin, where HIV-1 expanded early in the global pandemic. By sequencing a subgenomic fragment of the HIV-1 envelope from study participants in the DRC, we identified rare variants for complete genome sequencing. The basal branching of some of the complete genome sequences that we recovered suggests that these strains are more closely related to ancestral HIV-1 strains than to previously reported strains and is evidence that the local diversification of HIV in the DRC continues to outpace the diversity of global strains decades after the emergence of the pandemic.
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130
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Brown EP, Dowell KG, Boesch AW, Normandin E, Mahan AE, Chu T, Barouch DH, Bailey-Kellogg C, Alter G, Ackerman ME. Multiplexed Fc array for evaluation of antigen-specific antibody effector profiles. J Immunol Methods 2017; 443:33-44. [PMID: 28163018 PMCID: PMC5333794 DOI: 10.1016/j.jim.2017.01.010] [Citation(s) in RCA: 145] [Impact Index Per Article: 20.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/20/2016] [Revised: 01/27/2017] [Accepted: 01/31/2017] [Indexed: 01/09/2023]
Abstract
Antibodies are widely considered to be a frequent primary and often mechanistic correlate of protection of approved vaccines; thus evaluating the antibody response is of critical importance in attempting to understand and predict the efficacy of novel vaccine candidates. Historically, antibody responses have been analyzed by determining the titer of the humoral response using measurements such as an ELISA, neutralization, or agglutination assays. In the simplest case, sufficiently high titers of antibody against vaccine antigen(s) are sufficient to predict protection. However, antibody titer provides only a partial measure of antibody function, which is dependent on both the variable region (Fv) to bind the antigen target, and the constant region (Fc) to elicit an effector response from the innate arm of the immune system. In the case of some diseases, such as HIV, for which an effective vaccine has proven elusive, antibody effector function has been shown to be an important driver of monoclonal antibody therapy outcomes, of viral control in infected patients, and of vaccine-mediated protection in preclinical and clinical studies. We sought to establish a platform for the evaluation of the Fc domain characteristics of antigen-specific antibodies present in polyclonal samples in order to better develop insights into Fc receptor-mediated antibody effector activity, more fully understand how antibody responses may differ in association with disease progression and between subject groups, and differentiate protective from non-protective responses. To this end we have developed a high throughput biophysical platform capable of simultaneously evaluating many dimensions of the antibody effector response. High-throughput array-based characterization platform for polyclonal antibodies. Development of a biophysical proxy for antibody effector function. Antigen and Fc receptor recognition characteristics are captured. Enables systematic serologic studies of NHP and human antibody samples.
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Affiliation(s)
- Eric P Brown
- Thayer School of Engineering, Dartmouth College, Hanover, NH 03755, USA
| | - Karen G Dowell
- Department of Computer Science, Dartmouth College, Hanover, NH 03755, USA
| | - Austin W Boesch
- Thayer School of Engineering, Dartmouth College, Hanover, NH 03755, USA
| | - Erica Normandin
- Thayer School of Engineering, Dartmouth College, Hanover, NH 03755, USA
| | - Alison E Mahan
- Ragon Institute of Massachusetts General Hospital, Massachusetts Institute of Technology and Harvard University, Cambridge, MA, USA
| | - Thach Chu
- Thayer School of Engineering, Dartmouth College, Hanover, NH 03755, USA
| | - Dan H Barouch
- Beth Israel Deaconess Medical Center, Boston, MA, USA
| | | | - Galit Alter
- Ragon Institute of Massachusetts General Hospital, Massachusetts Institute of Technology and Harvard University, Cambridge, MA, USA
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132
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Abstract
It is clear that antibodies can play a pivotal role in preventing the transmission of HIV-1 and large efforts to identify an effective antibody-based vaccine to quell the epidemic. Shortly after HIV-1 was discovered as the cause of AIDS, the search for epitopes recognized by neutralizing antibodies became the driving strategy for an antibody-based vaccine. Neutralization escape variants were discovered shortly thereafter, and, after almost three decades of investigation, it is now known that autologous neutralizing antibody responses and their selection of neutralization resistant HIV-1 variants can lead to broadly neutralizing antibodies in some infected individuals. This observation drives an intensive effort to identify a vaccine to elicit broadly neutralizing antibodies. In contrast, there has been less systematic study of antibody specificities that must rely mainly or exclusively on other protective mechanisms, although non-human primate (NHP) studies as well as the RV144 vaccine trial indicate that non-neutralizing antibodies can contribute to protection. Here we propose a novel strategy to identify new epitope targets recognized by these antibodies for which viral escape is unlikely or impossible.
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Affiliation(s)
- George K Lewis
- Division of Vaccine Research, Institute of Human Virology, University of Maryland School of Medicine, Baltimore, MD, USA
| | - Marzena Pazgier
- Division of Vaccine Research, Institute of Human Virology, University of Maryland School of Medicine, Baltimore, MD, USA
| | - Anthony L DeVico
- Division of Vaccine Research, Institute of Human Virology, University of Maryland School of Medicine, Baltimore, MD, USA
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133
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Increased frequencies of CD8 +CD57 + T cells are associated with antibody neutralization breadth against HIV in viraemic controllers. J Int AIDS Soc 2016; 19:21136. [PMID: 27938646 PMCID: PMC5149708 DOI: 10.7448/ias.19.1.21136] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/16/2016] [Revised: 10/02/2016] [Accepted: 11/14/2016] [Indexed: 12/22/2022] Open
Abstract
Introduction An effective prophylactic vaccine against HIV will need to elicit antibody responses capable of recognizing and neutralizing rapidly evolving antigenic regions. The immunologic milieu associated with development of neutralizing antibody breadth remains to be fully defined. In this study, we sought to identify immunological signatures associated with neutralization breadth in HIV controllers. We applied an immune monitoring approach to analyze markers of T cell and myeloid cell activation by flow cytometry, comparing broad neutralizers with low- and non-neutralizers using multivariate and univariate analyses. Methods Antibody neutralization breadth was determined, and cryopreserved peripheral blood mononuclear cells were stained for T cell and myeloid cell activation markers. Subjects were grouped according to neutralization breadth, and T cell and myeloid cell activation was analyzed by partial least squares discriminant analysis to determine immune signatures associated with high neutralization breadth. Results We show that neutralization breadth in HIV viraemic controllers (VC) was strongly associated with increased frequencies of CD8+CD57+ T cells and that this association was independent of viral load, CD4 count and time since HIV diagnosis. Conclusions Our data show elevated frequencies of CD8+CD57+ T cells in VC who develop neutralization breadth against HIV. This immune signature could serve as a potential biomarker of neutralization breadth and should be further investigated in other HIV-positive cohorts and in HIV vaccine trials.
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134
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Abstract
Currently there is no effective vaccine against human immunodeficiency virus (HIV). Four recently published studies in Cell and Immunity now show that using planned sequential boosting with antigens to guide the humoral response towards broadly neutralizing antibodies could provide a solution to achieving vaccination against HIV-1.
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135
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Diversification in the HIV-1 Envelope Hyper-variable Domains V2, V4, and V5 and Higher Probability of Transmitted/Founder Envelope Glycosylation Favor the Development of Heterologous Neutralization Breadth. PLoS Pathog 2016; 12:e1005989. [PMID: 27851829 PMCID: PMC5112890 DOI: 10.1371/journal.ppat.1005989] [Citation(s) in RCA: 25] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/19/2016] [Accepted: 10/11/2016] [Indexed: 11/19/2022] Open
Abstract
A recent study of plasma neutralization breadth in HIV-1 infected individuals at nine International AIDS Vaccine Initiative (IAVI) sites reported that viral load, HLA-A*03 genotype, and subtype C infection were strongly associated with the development of neutralization breadth. Here, we refine the findings of that study by analyzing the impact of the transmitted/founder (T/F) envelope (Env), early Env diversification, and autologous neutralization on the development of plasma neutralization breadth in 21 participants identified during recent infection at two of those sites: Kigali, Rwanda (n = 9) and Lusaka, Zambia (n = 12). Single-genome analysis of full-length T/F Env sequences revealed that all 21 individuals were infected with a highly homogeneous population of viral variants, which were categorized as subtype C (n = 12), A1 (n = 7), or recombinant AC (n = 2). An extensive amino acid sequence-based analysis of variable loop lengths and glycosylation patterns in the T/F Envs revealed that a lower ratio of NXS to NXT-encoded glycan motifs correlated with neutralization breadth. Further analysis comparing amino acid sequence changes, insertions/deletions, and glycan motif alterations between the T/F Env and autologous early Env variants revealed that extensive diversification focused in the V2, V4, and V5 regions of gp120, accompanied by contemporaneous viral escape, significantly favored the development of breadth. These results suggest that more efficient glycosylation of subtype A and C T/F Envs through fewer NXS-encoded glycan sites is more likely to elicit antibodies that can transition from autologous to heterologous neutralizing activity following exposure to gp120 diversification. This initiates an Env-antibody co-evolution cycle that increases neutralization breadth, and is further augmented over time by additional viral and host factors. These findings suggest that understanding how variation in the efficiency of site-specific glycosylation influences neutralizing antibody elicitation and targeting could advance the design of immunogens aimed at inducing antibodies that can transition from autologous to heterologous neutralizing activity.
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136
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Deconstructing the Antiviral Neutralizing-Antibody Response: Implications for Vaccine Development and Immunity. Microbiol Mol Biol Rev 2016; 80:989-1010. [PMID: 27784796 DOI: 10.1128/mmbr.00024-15] [Citation(s) in RCA: 83] [Impact Index Per Article: 10.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022] Open
Abstract
The antibody response plays a key role in protection against viral infections. While antiviral antibodies may reduce the viral burden via several mechanisms, the ability to directly inhibit (neutralize) infection of cells has been extensively studied. Eliciting a neutralizing-antibody response is a goal of many vaccine development programs and commonly correlates with protection from disease. Considerable insights into the mechanisms of neutralization have been gained from studies of monoclonal antibodies, yet the individual contributions and dynamics of the repertoire of circulating antibody specificities elicited by infection and vaccination are poorly understood on the functional and molecular levels. Neutralizing antibodies with the most protective functionalities may be a rare component of a polyclonal, pathogen-specific antibody response, further complicating efforts to identify the elements of a protective immune response. This review discusses advances in deconstructing polyclonal antibody responses to flavivirus infection or vaccination. Our discussions draw comparisons to HIV-1, a virus with a distinct structure and replication cycle for which the antibody response has been extensively investigated. Progress toward deconstructing and understanding the components of polyclonal antibody responses identifies new targets and challenges for vaccination strategies.
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137
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Theiler J, Yoon H, Yusim K, Picker LJ, Fruh K, Korber B. Epigraph: A Vaccine Design Tool Applied to an HIV Therapeutic Vaccine and a Pan-Filovirus Vaccine. Sci Rep 2016; 6:33987. [PMID: 27703185 PMCID: PMC5050445 DOI: 10.1038/srep33987] [Citation(s) in RCA: 28] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/14/2016] [Accepted: 09/01/2016] [Indexed: 11/09/2022] Open
Abstract
Epigraph is an efficient graph-based algorithm for designing vaccine antigens to optimize potential T-cell epitope (PTE) coverage. Epigraph vaccine antigens are functionally similar to Mosaic vaccines, which have demonstrated effectiveness in preliminary HIV non-human primate studies. In contrast to the Mosaic algorithm, Epigraph is substantially faster, and in restricted cases, provides a mathematically optimal solution. Epigraph furthermore has new features that enable enhanced vaccine design flexibility. These features include the ability to exclude rare epitopes from a design, to optimize population coverage based on inexact epitope matches, and to apply the code to both aligned and unaligned input sequences. Epigraph was developed to provide practical design solutions for two outstanding vaccine problems. The first of these is a personalized approach to a therapeutic T-cell HIV vaccine that would provide antigens with an excellent match to an individual’s infecting strain, intended to contain or clear a chronic infection. The second is a pan-filovirus vaccine, with the potential to protect against all known viruses in the Filoviradae family, including ebolaviruses. A web-based interface to run the Epigraph tool suite is available (http://www.hiv.lanl.gov/content/sequence/EPIGRAPH/epigraph.html).
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Affiliation(s)
- James Theiler
- Los Alamos National Laboratory, Los Alamos, NM 87545, USA.,New Mexico Consortium, Los Alamos, NM 87544, USA
| | - Hyejin Yoon
- Los Alamos National Laboratory, Los Alamos, NM 87545, USA
| | - Karina Yusim
- Los Alamos National Laboratory, Los Alamos, NM 87545, USA.,New Mexico Consortium, Los Alamos, NM 87544, USA
| | - Louis J Picker
- Oregon Health and Science University, Portland, OR 97239, USA
| | - Klaus Fruh
- Oregon Health and Science University, Portland, OR 97239, USA
| | - Bette Korber
- Los Alamos National Laboratory, Los Alamos, NM 87545, USA.,New Mexico Consortium, Los Alamos, NM 87544, USA
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138
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Posada-Cespedes S, Seifert D, Beerenwinkel N. Recent advances in inferring viral diversity from high-throughput sequencing data. Virus Res 2016; 239:17-32. [PMID: 27693290 DOI: 10.1016/j.virusres.2016.09.016] [Citation(s) in RCA: 77] [Impact Index Per Article: 9.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/24/2016] [Revised: 09/23/2016] [Accepted: 09/24/2016] [Indexed: 02/05/2023]
Abstract
Rapidly evolving RNA viruses prevail within a host as a collection of closely related variants, referred to as viral quasispecies. Advances in high-throughput sequencing (HTS) technologies have facilitated the assessment of the genetic diversity of such virus populations at an unprecedented level of detail. However, analysis of HTS data from virus populations is challenging due to short, error-prone reads. In order to account for uncertainties originating from these limitations, several computational and statistical methods have been developed for studying the genetic heterogeneity of virus population. Here, we review methods for the analysis of HTS reads, including approaches to local diversity estimation and global haplotype reconstruction. Challenges posed by aligning reads, as well as the impact of reference biases on diversity estimates are also discussed. In addition, we address some of the experimental approaches designed to improve the biological signal-to-noise ratio. In the future, computational methods for the analysis of heterogeneous virus populations are likely to continue being complemented by technological developments.
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Affiliation(s)
- Susana Posada-Cespedes
- Department of Biosystems Science and Engineering, ETH Zurich, Basel, Switzerland; SIB, Basel, Switzerland
| | - David Seifert
- Department of Biosystems Science and Engineering, ETH Zurich, Basel, Switzerland; SIB, Basel, Switzerland
| | - Niko Beerenwinkel
- Department of Biosystems Science and Engineering, ETH Zurich, Basel, Switzerland; SIB, Basel, Switzerland.
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139
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Williams KL, Cortez V, Dingens AS, Gach JS, Rainwater S, Weis JF, Chen X, Spearman P, Forthal DN, Overbaugh J. HIV-specific CD4-induced Antibodies Mediate Broad and Potent Antibody-dependent Cellular Cytotoxicity Activity and Are Commonly Detected in Plasma From HIV-infected humans. EBioMedicine 2016; 2:1464-77. [PMID: 26629541 PMCID: PMC4634620 DOI: 10.1016/j.ebiom.2015.09.001] [Citation(s) in RCA: 45] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/03/2015] [Revised: 08/31/2015] [Accepted: 09/01/2015] [Indexed: 01/12/2023] Open
Abstract
HIV-specific antibodies (Abs) can reduce viral burden by blocking new rounds of infection or by destroying infected cells via activation of effector cells through Fc–FcR interaction. This latter process, referred to as antibody-dependent cellular cytotoxicity (ADCC), has been associated with viral control and improved clinical outcome following both HIV and SIV infections. Here we describe an HIV viral-like particle (VLP)-based sorting strategy that led to identification of HIV-specificmemory B cells encoding Abs that mediate ADCC froma subtype A-infected Kenyan woman at 914 days post-infection. Using this strategy, 12 HIV-envelope-specific monoclonal antibodies (mAbs) were isolated and three mediated potent ADCC activitywhen compared to well-characterized ADCC mAbs. The ADCC-mediating Abs also mediated antibody-dependent cell-mediated virus inhibition (ADCVI), which provides a net measure of Fc receptor-triggered effects against replicating virus. Two of the three ADCC-mediating Abs targeted a CD4-induced (CD4i) epitope also bound by the mAb C11; the third antibody targeted the N-terminus of V3. Both CD4i Abs identified here demonstrated strong cross-clade breadth with activity against 10 of 11 envelopes tested, including those from clades A, B, C, A/D and C/D, whereas the V3-specific antibody showed more limited breadth. Variants of these CD4i, C11-like mAbs engineered to interrupt binding to FcγRs inhibited a measurable percentage of the donor's ADCC activity starting as early as 189 days post-infection. C11-like antibodies also accounted for between 18–78% of ADCC activity in 9 chronically infected individuals from the same cohort study. Further, the two CD4i Abs originated from unique B cells, suggesting that antibodies targeting this epitope can be commonly produced. Taken together, these data provide strong evidence that CD4i, C11-like antibodies develop within the first 6 months of infection and they can arise fromunique B-cell lineages in the same individual. Further, thesemAbsmediate potent plasma IgG-specificADCC breadth and potency and contribute to ADCC activity in other HIV-infected individuals.
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140
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Vu HLX, Pattnaik AK, Osorio FA. Strategies to broaden the cross-protective efficacy of vaccines against porcine reproductive and respiratory syndrome virus. Vet Microbiol 2016; 206:29-34. [PMID: 27692670 DOI: 10.1016/j.vetmic.2016.09.014] [Citation(s) in RCA: 28] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/26/2016] [Revised: 09/19/2016] [Accepted: 09/20/2016] [Indexed: 02/06/2023]
Abstract
Porcine reproductive and respiratory syndrome virus (PRRSV) is one of the most economically important viral pathogens currently affecting swine production worldwide. Although PRRS vaccines have been commercially available for over 20 years, the available vaccines are considered inadequately effective for control and eradication of the virus. Major obstacles for the development of a highly effective PRRS vaccine include the highly variable nature of the viral genome, the viral ability to subvert the host immune system, and the incomplete understanding of the immune protection against PRRSV infection. This article summarizes the impediments for the development of a highly protective PRRS vaccine and reviews the vaccinology approaches that have been attempted to overcome one of the most formidable challenges, which is the substantial genetic variation among PRRSV isolates, to broaden the antigenic coverage of PRRS vaccines.
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Affiliation(s)
- Hiep L X Vu
- Nebraska Center for Virology, and School of Veterinary Medicine and Biomedical Sciences, University of Nebraska-Lincoln, Lincoln, Nebraska, United States.
| | - Asit K Pattnaik
- Nebraska Center for Virology, and School of Veterinary Medicine and Biomedical Sciences, University of Nebraska-Lincoln, Lincoln, Nebraska, United States
| | - Fernando A Osorio
- Nebraska Center for Virology, and School of Veterinary Medicine and Biomedical Sciences, University of Nebraska-Lincoln, Lincoln, Nebraska, United States
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141
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Li X, Li W, Zhong P, Fang K, Zhu K, Musa TH, Song Y, Du G, Gao R, Guo Y, Yan W, Xuan Y, Wei P. Nationwide Trends in Molecular Epidemiology of HIV-1 in China. AIDS Res Hum Retroviruses 2016; 32:851-9. [PMID: 27080587 DOI: 10.1089/aid.2016.0029] [Citation(s) in RCA: 74] [Impact Index Per Article: 9.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022] Open
Abstract
To estimate the nationwide and regional distribution of HIV-1 genotypes in China in the past three decades, province-specific HIV-1 molecular epidemiology data were derived from 260 independent studies of HIV molecular prevalence through searching PubMed, VIP Chinese Journal Database (VIP), China National Knowledge Infrastructure, and Wanfang Data from January 1981 to December 2015. The nationwide and regional distribution of HIV-1 genotypes was estimated by weighting the genotype distribution from each province- and risk-specific subpopulation with the number of reported cases in the corresponding subgroups in the relevant periods. A sharp transition of HIV-1 subtypes and recombinant distribution was observed in various risk groups and regions over time. CRF01_AE has rapidly surged among almost all risk groups and in all areas, and it has become dominant among men who have sex with men and heterosexuals. A wide variety of new circulating recombinant forms (CRFs) and unique recombinant forms (URFs) were rapidly appearing in several risk groups and regions. After 2007, CRF01_AE was the most prevalent strain, accounting for 42.5% of all national infections, followed by CRF07_BC (28.9%), subtype B'/B (10.9%), CRF08_BC (10.0%), and subtype C (2.8%). URFs and other CRFs were responsible for 2.6% and fewer than 1% of infections nationwide, respectively. The nationwide and regional distributions of HIV-1 subtypes and recombinants were sharply shifting in China. CRF01_AE and new CRFs played an increasing role in the nationwide or regional HIV pandemic. The nationwide diversity of HIV-1 poses a formidable challenge to HIV vaccine development and disease prevention.
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Affiliation(s)
- Xiaoshan Li
- Teaching and Research Office of Epidemiology and Health Statistics, School of Public Health, Southeast University, Nanjing, China
| | - Wei Li
- Department of Infectious Disease Prevention and School Health, Nanjing Municipal Center for Disease Control and Prevention, Nanjing, China
| | - Ping Zhong
- Department of AIDS and STD, Shanghai Municipal Center for Disease Control and Prevention, Shanghai Municipal Institutes for Preventive Medicine, Shanghai, China
| | - Kun Fang
- Teaching and Research Office of Epidemiology and Health Statistics, School of Public Health, Southeast University, Nanjing, China
| | - Kexin Zhu
- School of Public Health, Nantong University, Nantong, China
| | - Taha Hussein Musa
- Teaching and Research Office of Epidemiology and Health Statistics, School of Public Health, Southeast University, Nanjing, China
| | - Yue Song
- Teaching and Research Office of Epidemiology and Health Statistics, School of Public Health, Southeast University, Nanjing, China
| | - Guoping Du
- Teaching and Research Office of Epidemiology and Health Statistics, School of Public Health, Southeast University, Nanjing, China
| | - Rong Gao
- Teaching and Research Office of Epidemiology and Health Statistics, School of Public Health, Southeast University, Nanjing, China
| | - Yan Guo
- Teaching and Research Office of Epidemiology and Health Statistics, School of Public Health, Southeast University, Nanjing, China
| | - Wenjuan Yan
- Teaching and Research Office of Epidemiology and Health Statistics, School of Public Health, Southeast University, Nanjing, China
| | - Yang Xuan
- Teaching and Research Office of Epidemiology and Health Statistics, School of Public Health, Southeast University, Nanjing, China
| | - Pingmin Wei
- Teaching and Research Office of Epidemiology and Health Statistics, School of Public Health, Southeast University, Nanjing, China
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142
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Churchyard G, Mlisana K, Karuna S, Williamson AL, Williamson C, Morris L, Tomaras GD, De Rosa SC, Gilbert PB, Gu N, Yu C, Mkhize NN, Hermanus T, Allen M, Pensiero M, Barnett SW, Gray G, Bekker LG, Montefiori DC, Kublin J, Corey L. Sequential Immunization with gp140 Boosts Immune Responses Primed by Modified Vaccinia Ankara or DNA in HIV-Uninfected South African Participants. PLoS One 2016; 11:e0161753. [PMID: 27583368 PMCID: PMC5008759 DOI: 10.1371/journal.pone.0161753] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/16/2016] [Accepted: 08/08/2016] [Indexed: 11/24/2022] Open
Abstract
BACKGROUND The safety and immunogenicity of SAAVI DNA-C2 (4 mg IM), SAAVI MVA-C (2.9 x 109 pfu IM) and Novartis V2-deleted subtype C gp140 (100 mcg) with MF59 adjuvant in various vaccination regimens was evaluated in HIV-uninfected adults in South Africa. METHODS Participants at three South African sites were randomized (1:1:1:1) to one of four vaccine regimens: MVA prime, sequential gp140 protein boost (M/M/P/P); concurrent MVA/gp140 (MP/MP); DNA prime, sequential MVA boost (D/D/M/M); DNA prime, concurrent MVA/gp140 boost (D/D/MP/MP) or placebo. Peak HIV specific humoral and cellular responses were measured. RESULTS 184 participants were enrolled: 52% were female, all were Black/African, median age was 23 years (range, 18-42 years) and 79% completed all vaccinations. 159 participants reported at least one adverse event, 92.5% were mild or moderate. Five, unrelated, serious adverse events were reported. The M/M/P/P and D/D/MP/MP regimens induced the strongest peak neutralizing and binding antibody responses and the greatest CD4+ T-cell responses to Env. All peak neutralizing and binding antibody responses decayed with time. The MVA, but not DNA, prime contributed to the humoral and cellular immune responses. The D/D/M/M regimen was poorly immunogenic overall but did induce modest CD4+ T-cell responses to Gag and Pol. CD8+ T-cell responses to any antigen were low for all regimens. CONCLUSIONS The SAAVI DNA-C2, SAAVI MVA-C and Novartis gp140 with MF59 adjuvant in various combinations were safe and induced neutralizing and binding antibodies and cellular immune responses. Sequential immunization with gp140 boosted immune responses primed by MVA or DNA. The best overall immune responses were seen with the M/M/P/P regimen. TRIAL REGISTRATION ClinicalTrials.gov NCT01418235.
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Affiliation(s)
- Gavin Churchyard
- Aurum Institute for Health Research, Klerksdorp, South Africa
- School of Public Health, University of Witwatersrand, Johannesburg, South Africa
- Advancing Care and Treatment for TB and HIV, Medical Research Council Collaborating Centre, Klerksdorp, South Africa
| | | | - Shelly Karuna
- Vaccine and Infectious Disease Division, Fred Hutchinson Cancer Research Center, Seattle, WA, United States of America
| | - Anna-Lise Williamson
- Institute of Infectious Disease and Molecular Medicine, Division of Medical Virology, University of Cape Town, Cape Town, South Africa; National Health Laboratory Services, Observatory, Cape Town, South Africa
| | - Carolyn Williamson
- Institute of Infectious Disease and Molecular Medicine, Division of Medical Virology, University of Cape Town, Cape Town, South Africa; National Health Laboratory Services, Observatory, Cape Town, South Africa
| | - Lynn Morris
- National Institute for Communicable Diseases, National Health Laboratory Services, Sandringham, Johannesburg, South Africa
| | - Georgia D. Tomaras
- Duke Human Vaccine Institute, Duke University Medical Center, Durham, NC, United States of America
| | - Stephen C. De Rosa
- Vaccine and Infectious Disease Division, Fred Hutchinson Cancer Research Center, Seattle, WA, United States of America
- Department of Laboratory Medicine, University of Washington, Seattle, WA, United States of America
| | - Peter B. Gilbert
- Vaccine and Infectious Disease Division, Fred Hutchinson Cancer Research Center, Seattle, WA, United States of America
| | - Niya Gu
- Vaccine and Infectious Disease Division, Fred Hutchinson Cancer Research Center, Seattle, WA, United States of America
| | - Chenchen Yu
- Vaccine and Infectious Disease Division, Fred Hutchinson Cancer Research Center, Seattle, WA, United States of America
| | - Nonhlanhla N. Mkhize
- National Institute for Communicable Diseases, National Health Laboratory Services, Sandringham, Johannesburg, South Africa
| | - Tandile Hermanus
- National Institute for Communicable Diseases, National Health Laboratory Services, Sandringham, Johannesburg, South Africa
| | - Mary Allen
- Vaccine Research Program, Division of AIDS, National Institute of Allergy and Infectious Diseases, National Institutes of Health, Bethesda, MD, United States of America
| | - Michael Pensiero
- Vaccine Research Program, Division of AIDS, National Institute of Allergy and Infectious Diseases, National Institutes of Health, Bethesda, MD, United States of America
| | - Susan W. Barnett
- Novartis Vaccines and Diagnostics, Cambridge, MA, United States of America
| | - Glenda Gray
- South African Medical Research Council, Cape Town, South Africa
- Perinatal HIV Research Unit, Faculty of Health Sciences, University of the Witwatersrand, Braamfontein, Johannesburg, South Africa
| | - Linda-Gail Bekker
- Desmond Tutu HIV Centre, Institute of Infectious Disease and Molecular Medicine, University of Cape Town, Cape Town, South Africa
| | - David C. Montefiori
- Laboratory for AIDS Vaccine Research and Development, Duke University Medical Center, Durham, NC, United States of America
| | - James Kublin
- Vaccine and Infectious Disease Division, Fred Hutchinson Cancer Research Center, Seattle, WA, United States of America
| | - Lawrence Corey
- Vaccine and Infectious Disease Division, Fred Hutchinson Cancer Research Center, Seattle, WA, United States of America
- Department of Laboratory Medicine, University of Washington, Seattle, WA, United States of America
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143
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Ishii H, Matsuoka S, Nomura T, Nakamura M, Shiino T, Sato Y, Iwata-Yoshikawa N, Hasegawa H, Mizuta K, Sakawaki H, Miura T, Koyanagi Y, Naruse TK, Kimura A, Matano T. Association of lymph-node antigens with lower Gag-specific central-memory and higher Env-specific effector-memory CD8(+) T-cell frequencies in a macaque AIDS model. Sci Rep 2016; 6:30153. [PMID: 27452272 PMCID: PMC4958968 DOI: 10.1038/srep30153] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/25/2016] [Accepted: 06/27/2016] [Indexed: 01/17/2023] Open
Abstract
Virus-specific CD8+ T cells exert strong suppressive pressure on human/simian immunodeficiency virus (HIV/SIV) replication. These responses have been intensively examined in peripheral blood mononuclear cells (PBMCs) but not fully analyzed in lymph nodes (LNs), where interaction between CD8+ T cells and HIV/SIV-infected cells occurs. Here, we investigated target antigen specificity of CD8+ T cells in LNs in a macaque AIDS model. Analysis of virus antigen-specific CD8+ T-cell responses in the inguinal LNs obtained from twenty rhesus macaques in the chronic phase of SIV infection showed an inverse correlation between viral loads and frequencies of CD8+ T cells with CD28+ CD95+ central memory phenotype targeting the N-terminal half of SIV core antigen (Gag-N). In contrast, analysis of LNs but not PBMCs revealed a positive correlation between viral loads and frequencies of CD8+ T cells with CD28−CD95+ effector memory phenotype targeting the N-terminal half of SIV envelope (Env-N), soluble antigen. Indeed, LNs with detectable SIV capsid p27 antigen in the germinal center exhibited significantly lower Gag-N-specific CD28+ CD95+ CD8+ T-cell and higher Env-N-specific CD28−CD95+ CD8+ T-cell responses than those without detectable p27. These results imply that core and envelope antigen-specific CD8+ T cells show different patterns of interactions with HIV/SIV-infected cells.
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Affiliation(s)
- Hiroshi Ishii
- AIDS Research Center, National Institute of Infectious Diseases, Tokyo 162-8640, Japan
| | - Saori Matsuoka
- AIDS Research Center, National Institute of Infectious Diseases, Tokyo 162-8640, Japan
| | - Takushi Nomura
- AIDS Research Center, National Institute of Infectious Diseases, Tokyo 162-8640, Japan.,Center for AIDS Research, Kumamoto University, Tokyo 162-8640, Japan
| | - Midori Nakamura
- AIDS Research Center, National Institute of Infectious Diseases, Tokyo 162-8640, Japan
| | - Teiichiro Shiino
- AIDS Research Center, National Institute of Infectious Diseases, Tokyo 162-8640, Japan
| | - Yuko Sato
- Department of Pathology, National Institute of Infectious Diseases, Tokyo 162-8640, Japan
| | - Naoko Iwata-Yoshikawa
- Department of Pathology, National Institute of Infectious Diseases, Tokyo 162-8640, Japan
| | - Hideki Hasegawa
- Department of Pathology, National Institute of Infectious Diseases, Tokyo 162-8640, Japan
| | - Kazuta Mizuta
- Institute for Virus Research, Kyoto University, Kyoto 606-8507, Japan
| | - Hiromi Sakawaki
- Institute for Virus Research, Kyoto University, Kyoto 606-8507, Japan
| | - Tomoyuki Miura
- Institute for Virus Research, Kyoto University, Kyoto 606-8507, Japan
| | - Yoshio Koyanagi
- Institute for Virus Research, Kyoto University, Kyoto 606-8507, Japan
| | - Taeko K Naruse
- Department of Molecular Pathogenesis, Medical Research Institute, Tokyo Medical and Dental University, Tokyo 113-8510, Japan
| | - Akinori Kimura
- Department of Molecular Pathogenesis, Medical Research Institute, Tokyo Medical and Dental University, Tokyo 113-8510, Japan
| | - Tetsuro Matano
- AIDS Research Center, National Institute of Infectious Diseases, Tokyo 162-8640, Japan.,The Institute of Medical Science, The University of Tokyo, Tokyo 108-8639, Japan
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144
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Affiliation(s)
- Jeffrey B. Joy
- BC Centre for Excellence in HIV/AIDS, Vancouver, British Columbia, Canada
- University of British Columbia, Department of Medicine, Vancouver, British Columbia, Canada
| | - Richard H. Liang
- BC Centre for Excellence in HIV/AIDS, Vancouver, British Columbia, Canada
| | | | - T. Nguyen
- BC Centre for Excellence in HIV/AIDS, Vancouver, British Columbia, Canada
| | - Art F. Y. Poon
- BC Centre for Excellence in HIV/AIDS, Vancouver, British Columbia, Canada
- University of British Columbia, Department of Medicine, Vancouver, British Columbia, Canada
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145
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Wheeler LC, Lim SA, Marqusee S, Harms MJ. The thermostability and specificity of ancient proteins. Curr Opin Struct Biol 2016; 38:37-43. [PMID: 27288744 DOI: 10.1016/j.sbi.2016.05.015] [Citation(s) in RCA: 85] [Impact Index Per Article: 10.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/03/2016] [Revised: 05/18/2016] [Accepted: 05/24/2016] [Indexed: 11/16/2022]
Abstract
Were ancient proteins systematically different than modern proteins? The answer to this question is profoundly important, shaping how we understand the origins of protein biochemical, biophysical, and functional properties. Ancestral sequence reconstruction (ASR), a phylogenetic approach to infer the sequences of ancestral proteins, may reveal such trends. We discuss two proposed trends: a transition from higher to lower thermostability and a tendency for proteins to acquire higher specificity over time. We review the evidence for elevated ancestral thermostability and discuss its possible origins in a changing environmental temperature and/or reconstruction bias. We also conclude that there is, as yet, insufficient data to support a trend from promiscuity to specificity. Finally, we propose future work to understand these proposed evolutionary trends.
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Affiliation(s)
- Lucas C Wheeler
- Department of Chemistry and Biochemistry, University of Oregon, Eugene, OR, United States; Institute of Molecular Biology, University of Oregon, Eugene, OR, United States
| | - Shion A Lim
- Department of Molecular and Cell Biology, University of California, Berkeley, Berkeley, CA, United States; Institute for Quantitative Biosciences (QB3), University of California, Berkeley, Berkeley, CA, United States
| | - Susan Marqusee
- Department of Molecular and Cell Biology, University of California, Berkeley, Berkeley, CA, United States; Institute for Quantitative Biosciences (QB3), University of California, Berkeley, Berkeley, CA, United States.
| | - Michael J Harms
- Department of Chemistry and Biochemistry, University of Oregon, Eugene, OR, United States; Institute of Molecular Biology, University of Oregon, Eugene, OR, United States.
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146
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Mordecai GJ, Wilfert L, Martin SJ, Jones IM, Schroeder DC. Diversity in a honey bee pathogen: first report of a third master variant of the Deformed Wing Virus quasispecies. THE ISME JOURNAL 2016; 10:1264-73. [PMID: 26574686 PMCID: PMC5029213 DOI: 10.1038/ismej.2015.178] [Citation(s) in RCA: 114] [Impact Index Per Article: 14.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 06/30/2015] [Revised: 08/14/2015] [Accepted: 08/21/2015] [Indexed: 01/06/2023]
Abstract
Treatment of emerging RNA viruses is hampered by the high mutation and replication rates that enable these viruses to operate as a quasispecies. Declining honey bee populations have been attributed to the ectoparasitic mite Varroa destructor and its affiliation with Deformed Wing Virus (DWV). In the current study we use next-generation sequencing to investigate the DWV quasispecies in an apiary known to suffer from overwintering colony losses. We show that the DWV species complex is made up of three master variants. Our results indicate that a new DWV Type C variant is distinct from the previously described types A and B, but together they form a distinct clade compared with other members of the Iflaviridae. The molecular clock estimation predicts that Type C diverged from the other variants ∼319 years ago. The discovery of a new master variant of DWV has important implications for the positive identification of the true pathogen within global honey bee populations.
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Affiliation(s)
- Gideon J Mordecai
- Viral Ecology, Marine Biological Association, Plymouth, UK
- School of Biological Sciences, University of Reading, Reading, UK
| | - Lena Wilfert
- Centre for Ecology and Conservation, University of Exeter, Penryn Campus, Penryn, UK
| | - Stephen J Martin
- School of Environment and Life Sciences, The University of Salford, Manchester, UK
| | - Ian M Jones
- School of Biological Sciences, University of Reading, Reading, UK
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147
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Archary D, Seaton KE, Passmore JS, Werner L, Deal A, Dunphy LJ, Arnold KB, Yates NL, Lauffenburger DA, Bergin P, Liebenberg LJ, Samsunder N, Mureithi MW, Altfeld M, Garrett N, Karim QA, Karim SSA, Morris L, Tomaras GD. Distinct genital tract HIV-specific antibody profiles associated with tenofovir gel. Mucosal Immunol 2016; 9:821-833. [PMID: 26813340 PMCID: PMC4848129 DOI: 10.1038/mi.2015.145] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/07/2015] [Accepted: 11/30/2015] [Indexed: 02/04/2023]
Abstract
The impact of topical antiretrovirals for pre-exposure prophylaxis on humoral responses following HIV infection is unknown. Using a binding antibody multiplex assay, we investigated HIV-specific IgG and IgA responses to envelope glycoproteins, p24 Gag and p66, in the genital tract (GT) and plasma following HIV acquisition in women assigned to tenofovir gel (n=24) and placebo gel (n=24) in the CAPRISA 004 microbicide trial to assess if this topical antiretroviral had an impact on mucosal and systemic antibody responses. Linear mixed effect modeling and partial least squares discriminant analysis was used to identify multivariate antibody signatures associated with tenofovir use. There were significantly higher response rates to gp120 Env (P=0.03), p24 (P=0.002), and p66 (P=0.009) in plasma and GT in women assigned to tenofovir than placebo gel at multiple time points post infection. Notably, p66 IgA titers in the GT and plasma were significantly higher in the tenofovir compared with the placebo arm (P<0.05). Plasma titers for 9 of the 10 HIV-IgG specificities predicted GT levels. Taken together, these data suggest that humoral immune responses are increased in blood and GT of individuals who acquire HIV infection in the presence of tenofovir gel.
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Affiliation(s)
- D Archary
- Centre for the AIDS Program of Research in South Africa, University of KwaZulu-Natal, Durban, South Africa
| | - KE Seaton
- Duke Human Vaccine Institute, Duke University Medical Center, Durham, North Carolina, USA
| | - JS Passmore
- Centre for the AIDS Program of Research in South Africa, University of KwaZulu-Natal, Durban, South Africa
- Institute of Infectious Diseases and Molecular Medicine, University of Cape Town, Cape Town, South Africa
- National Institute for Communicable Diseases of the National Health Laboratory Services, Johannesburg, South Africa
| | - L Werner
- Centre for the AIDS Program of Research in South Africa, University of KwaZulu-Natal, Durban, South Africa
| | - A Deal
- Duke Human Vaccine Institute, Duke University Medical Center, Durham, North Carolina, USA
| | - LJ Dunphy
- Department of Biological Engineering, Massachusetts Institute of Technology, Cambridge, Massachusetts, USA
| | - KB Arnold
- Department of Biological Engineering, Massachusetts Institute of Technology, Cambridge, Massachusetts, USA
| | - NL Yates
- Duke Human Vaccine Institute, Duke University Medical Center, Durham, North Carolina, USA
| | - DA Lauffenburger
- Department of Biological Engineering, Massachusetts Institute of Technology, Cambridge, Massachusetts, USA
| | - P Bergin
- Imperial College, International AIDS Vaccine Initiative Core Immune Monitoring Laboratory, London, UK
| | - LJ Liebenberg
- Centre for the AIDS Program of Research in South Africa, University of KwaZulu-Natal, Durban, South Africa
| | - N Samsunder
- Centre for the AIDS Program of Research in South Africa, University of KwaZulu-Natal, Durban, South Africa
| | - MW Mureithi
- KAVI Institute of Clinical Research, School of Medicine, College of Health Sciences, University of Nairobi, Nairobi, Kenya
| | - M Altfeld
- Heinrich-Pette Institut, Leibniz Institute for Experimental Virology, University of Hamburg, Hamburg, Germany
| | - N Garrett
- Centre for the AIDS Program of Research in South Africa, University of KwaZulu-Natal, Durban, South Africa
| | - Q Abdool Karim
- Centre for the AIDS Program of Research in South Africa, University of KwaZulu-Natal, Durban, South Africa
- Department of Epidemiology, Mailman School of Public Health, Columbia University, New York, NY, USA
| | - SS Abdool Karim
- Centre for the AIDS Program of Research in South Africa, University of KwaZulu-Natal, Durban, South Africa
- Department of Epidemiology, Mailman School of Public Health, Columbia University, New York, NY, USA
| | - L Morris
- Centre for the AIDS Program of Research in South Africa, University of KwaZulu-Natal, Durban, South Africa
- National Institute for Communicable Diseases of the National Health Laboratory Services, Johannesburg, South Africa
| | - GD Tomaras
- Duke Human Vaccine Institute, Duke University Medical Center, Durham, North Carolina, USA
- Departments of Surgery, Immunology and Molecular Genetics and Microbiology, Duke University, Durham, North Carolina, USA
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148
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Badamchi-Zadeh A, McKay PF, Korber BT, Barinaga G, Walters AA, Nunes A, Gomes JP, Follmann F, Tregoning JS, Shattock RJ. A Multi-Component Prime-Boost Vaccination Regimen with a Consensus MOMP Antigen Enhances Chlamydia trachomatis Clearance. Front Immunol 2016; 7:162. [PMID: 27199987 PMCID: PMC4848310 DOI: 10.3389/fimmu.2016.00162] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/03/2016] [Accepted: 04/15/2016] [Indexed: 11/13/2022] Open
Abstract
BACKGROUND A vaccine for Chlamydia trachomatis is of urgent medical need. We explored bioinformatic approaches to generate an immunogen against C. trachomatis that would induce cross-serovar T-cell responses as (i) CD4(+) T cells have been shown in animal models and human studies to be important in chlamydial protection and (ii) antibody responses may be restrictive and serovar specific. METHODS A consensus antigen based on over 1,500 major outer membrane protein (MOMP) sequences provided high epitope coverage against the most prevalent C. trachomatis strains in silico. Having designed the T-cell immunogen, we assessed it for immunogenicity in prime-boost regimens. This consensus MOMP transgene was delivered using plasmid DNA, Human Adenovirus 5 (HuAd5) or modified vaccinia Ankara (MVA) vectors with or without MF59(®) adjuvanted recombinant MOMP protein. RESULTS Different regimens induced distinct immune profiles. The DNA-HuAd5-MVA-Protein vaccine regimen induced a cellular response with a Th1-biased serum antibody response, alongside high serum and vaginal MOMP-specific antibodies. This regimen significantly enhanced clearance against intravaginal C. trachomatis serovar D infection in both BALB/c and B6C3F1 mouse strains. This enhanced clearance was shown to be CD4(+) T-cell dependent. Future studies will need to confirm the specificity and precise mechanisms of protection. CONCLUSION A C. trachomatis vaccine needs to induce a robust cellular response with broad cross-serovar coverage and a heterologous prime-boost regimen may be an approach to achieve this.
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Affiliation(s)
| | - Paul F McKay
- Mucosal Infection and Immunity Group, Imperial College London , London , UK
| | - Bette T Korber
- Los Alamos National Laboratory, Theoretical Division , Los Alamos, NM , USA
| | - Guillermo Barinaga
- Mucosal Infection and Immunity Group, Imperial College London , London , UK
| | - Adam A Walters
- Mucosal Infection and Immunity Group, Imperial College London , London , UK
| | - Alexandra Nunes
- Department of Infectious Diseases, National Institute of Health , Lisbon , Portugal
| | - João Paulo Gomes
- Department of Infectious Diseases, National Institute of Health , Lisbon , Portugal
| | - Frank Follmann
- Chlamydia Vaccine Research, Department of Infectious Disease Immunology, Statens Serum Institute , Copenhagen , Denmark
| | - John S Tregoning
- Mucosal Infection and Immunity Group, Imperial College London , London , UK
| | - Robin J Shattock
- Mucosal Infection and Immunity Group, Imperial College London , London , UK
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149
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Zurawski G, Zurawski S, Flamar AL, Richert L, Wagner R, Tomaras GD, Montefiori DC, Roederer M, Ferrari G, Lacabaratz C, Bonnabau H, Klucar P, Wang Z, Foulds KE, Kao SF, Yates NL, LaBranche C, Jacobs BL, Kibler K, Asbach B, Kliche A, Salazar A, Reed S, Self S, Gottardo R, Galmin L, Weiss D, Cristillo A, Thiebaut R, Pantaleo G, Levy Y. Targeting HIV-1 Env gp140 to LOX-1 Elicits Immune Responses in Rhesus Macaques. PLoS One 2016; 11:e0153484. [PMID: 27077384 PMCID: PMC4831750 DOI: 10.1371/journal.pone.0153484] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/13/2016] [Accepted: 03/19/2016] [Indexed: 12/30/2022] Open
Abstract
Improved antigenicity against HIV-1 envelope (Env) protein is needed to elicit vaccine-induced protective immunity in humans. Here we describe the first tests in non-human primates (NHPs) of Env gp140 protein fused to a humanized anti-LOX-1 recombinant antibody for delivering Env directly to LOX-1-bearing antigen presenting cells, especially dendritic cells (DC). LOX-1, or 1ectin-like oxidized low-density lipoprotein (LDL) receptor-1, is expressed on various antigen presenting cells and endothelial cells, and is involved in promoting humoral immune responses. The anti-LOX-1 Env gp140 fusion protein was tested for priming immune responses and boosting responses in animals primed with replication competent NYVAC-KC Env gp140 vaccinia virus. Anti-LOX-1 Env gp140 vaccination elicited robust cellular and humoral responses when used for either priming or boosting immunity. Co-administration with Poly ICLC, a TLR3 agonist, was superior to GLA, a TLR4 agonist. Both CD4+ and CD8+ Env-specific T cell responses were elicited by anti-LOX-1 Env gp140, but in particular the CD4+ T cells were multifunctional and directed to multiple epitopes. Serum IgG and IgA antibody responses induced by anti-LOX-1 Env gp140 against various gp140 domains were cross-reactive across HIV-1 clades; however, the sera neutralized only HIV-1 bearing sequences most similar to the clade C 96ZM651 Env gp140 carried by the anti-LOX-1 vehicle. These data, as well as the safety of this protein vaccine, justify further exploration of this DC-targeting vaccine approach for protective immunity against HIV-1.
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Affiliation(s)
- Gerard Zurawski
- Vaccine Research Institute, Université Paris-Est, Faculté de Médecine, INSERM U955, and Assistance Publique-Hôpitaux de Paris, Groupe Henri-Mondor Albert- Chenevier, service d’immunologie clinique, INRIA SISTM, Créteil, France
- Baylor Institute for Immunology Research and INSERM U955, Dallas, Texas, United States of America
- * E-mail:
| | - Sandra Zurawski
- Vaccine Research Institute, Université Paris-Est, Faculté de Médecine, INSERM U955, and Assistance Publique-Hôpitaux de Paris, Groupe Henri-Mondor Albert- Chenevier, service d’immunologie clinique, INRIA SISTM, Créteil, France
- Baylor Institute for Immunology Research and INSERM U955, Dallas, Texas, United States of America
| | - Anne-Laure Flamar
- Vaccine Research Institute, Université Paris-Est, Faculté de Médecine, INSERM U955, and Assistance Publique-Hôpitaux de Paris, Groupe Henri-Mondor Albert- Chenevier, service d’immunologie clinique, INRIA SISTM, Créteil, France
- Baylor Institute for Immunology Research and INSERM U955, Dallas, Texas, United States of America
| | - Laura Richert
- INSERM U897, INRIA SISTM, Université Bordeaux Segalen, Bordeaux, France
| | - Ralf Wagner
- Molecular Microbiology and Gene Therapy Unit, Institute of Medical Microbiology and Hygiene, University of Regensburg, Regensburg, Germany
| | - Georgia D. Tomaras
- Department of Surgery, Duke University Medical Center, Durham, North Carolina, United States of America
- Duke Human Vaccine Institute, Duke University Medical Center, Durham, North Carolina, United States of America
| | - David C. Montefiori
- Department of Surgery, Duke University Medical Center, Durham, North Carolina, United States of America
- Duke Human Vaccine Institute, Duke University Medical Center, Durham, North Carolina, United States of America
| | - Mario Roederer
- Vaccine Research Center, NIAID, NIH, Bethesda, Maryland, United States of America
| | - Guido Ferrari
- Department of Surgery, Duke University Medical Center, Durham, North Carolina, United States of America
| | - Christine Lacabaratz
- Vaccine Research Institute, Université Paris-Est, Faculté de Médecine, INSERM U955, and Assistance Publique-Hôpitaux de Paris, Groupe Henri-Mondor Albert- Chenevier, service d’immunologie clinique, INRIA SISTM, Créteil, France
| | - Henri Bonnabau
- INSERM U897, INRIA SISTM, Université Bordeaux Segalen, Bordeaux, France
| | - Peter Klucar
- Vaccine Research Institute, Université Paris-Est, Faculté de Médecine, INSERM U955, and Assistance Publique-Hôpitaux de Paris, Groupe Henri-Mondor Albert- Chenevier, service d’immunologie clinique, INRIA SISTM, Créteil, France
- Baylor Institute for Immunology Research and INSERM U955, Dallas, Texas, United States of America
| | - Zhiqing Wang
- Vaccine Research Institute, Université Paris-Est, Faculté de Médecine, INSERM U955, and Assistance Publique-Hôpitaux de Paris, Groupe Henri-Mondor Albert- Chenevier, service d’immunologie clinique, INRIA SISTM, Créteil, France
- Baylor Institute for Immunology Research and INSERM U955, Dallas, Texas, United States of America
| | - Kathryn E. Foulds
- Vaccine Research Center, NIAID, NIH, Bethesda, Maryland, United States of America
| | - Shing-Fen Kao
- Vaccine Research Center, NIAID, NIH, Bethesda, Maryland, United States of America
| | - Nicole L. Yates
- Department of Surgery, Duke University Medical Center, Durham, North Carolina, United States of America
| | - Celia LaBranche
- Department of Surgery, Duke University Medical Center, Durham, North Carolina, United States of America
| | - Bertram L. Jacobs
- School of Life Sciences, Center for Infectious Diseases and Vaccinology, Arizona State University, Tempe, Arizona, United States of America
| | - Karen Kibler
- School of Life Sciences, Center for Infectious Diseases and Vaccinology, Arizona State University, Tempe, Arizona, United States of America
| | - Benedikt Asbach
- Molecular Microbiology and Gene Therapy Unit, Institute of Medical Microbiology and Hygiene, University of Regensburg, Regensburg, Germany
| | - Alexander Kliche
- Molecular Microbiology and Gene Therapy Unit, Institute of Medical Microbiology and Hygiene, University of Regensburg, Regensburg, Germany
| | | | - Steve Reed
- Infectious Disease Research Institute, Seattle, Washington, United States of America
| | - Steve Self
- Vaccine and Infectious Disease and Public Health Sciences Divisions, Fred Hutchinson Cancer Research Center, Seattle, Washington, United States of America
| | - Raphael Gottardo
- Vaccine and Infectious Disease and Public Health Sciences Divisions, Fred Hutchinson Cancer Research Center, Seattle, Washington, United States of America
| | - Lindsey Galmin
- Advanced BioScience Laboratories, Inc., Rockville, Maryland, United States of America
| | - Deborah Weiss
- Advanced BioScience Laboratories, Inc., Rockville, Maryland, United States of America
| | - Anthony Cristillo
- Advanced BioScience Laboratories, Inc., Rockville, Maryland, United States of America
| | - Rodolphe Thiebaut
- INSERM U897, INRIA SISTM, Université Bordeaux Segalen, Bordeaux, France
| | - Giuseppe Pantaleo
- Centre Hospitalier Universitaire Vaudois, CH-101, Lausanne, Switzerland
| | - Yves Levy
- Vaccine Research Institute, Université Paris-Est, Faculté de Médecine, INSERM U955, and Assistance Publique-Hôpitaux de Paris, Groupe Henri-Mondor Albert- Chenevier, service d’immunologie clinique, INRIA SISTM, Créteil, France
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150
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Courtney CR, Agyingi L, Fokou A, Christie S, Asaah B, Meli J, Ngai J, Hewlett I, Nyambi PN. Monitoring HIV-1 Group M Subtypes in Yaoundé, Cameroon Reveals Broad Genetic Diversity and a Novel CRF02_AG/F2 Infection. AIDS Res Hum Retroviruses 2016; 32:381-5. [PMID: 26681241 DOI: 10.1089/aid.2015.0286] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
Abstract
Broad HIV-1 genetic diversity in Cameroon provides a unique opportunity to monitor HIV-1 evolution and allows the detection of novel strains. We have genetically characterized the HIV-1 subtypes found in 156 samples from 90 drug-naive subjects in Yaoundé, Cameroon collected from 2011 to 2013, using phylogenetic analysis of regions in gag and pol. We identified subtypes CRF02_AG (64.9%), CRF22_01A1 (7.1%), D (4.5%), F2 (3.9%), G (3.2%), CRF18_cpx (3.2%), CRF37_cpx (3.2%), CRF11_cpx (2.6%), CRF13_cpx (1.9%), A1 (1.3%), CRF01_AE (1.3%), CRF09_cpx (1.3%), A2 (0.6%), and H (0.6%). Sequence data for both the gag and pol regions were obtained from 62 subjects; for 59 of these subjects the two regions were identified as the same viral subtype while three subjects were discordant, A1/CRF02_AG (subject MDC006), CRF02_AG/F2 (subject MDC179), and a dual infection with CRF02_AG/F2 (subject MDC131). Longitudinal sequence data were obtained for 28 of these 62 subjects and confirmed the cross-sectional results. These data update subtype information for this area and highlight the necessity of such studies due to the numerous circulating subtypes, the ongoing superinfection, and the risk of emerging novel recombinant viruses.
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Affiliation(s)
- Colleen R. Courtney
- Department of Microbiology, New York University School of Medicine, New York, New York
| | - Lucy Agyingi
- Faculty of Science, University of Dschang, Dschang, Cameroon
- Medical Diagnostic Center, Yaoundé, Cameroon
| | | | - Stephanie Christie
- Department of Biophysics and Systems Pharmacology, Icahn School of Medicine Mount Sinai, New York, New York
| | | | - Josephine Meli
- Medical Diagnostic Center, Yaoundé, Cameroon
- General Hospital of Yaoundé, Yaoundé, Cameroon
| | | | - Indira Hewlett
- Laboratory of Molecular Virology, Division of Emerging and Transmission Transmitted Diseases, Office of Blood Review and Research, Center for Biologics Evaluation and Research, Food and Drug Administration, Silver Spring, Maryland
| | - Phillipe N. Nyambi
- Department of Pathology, New York University School of Medicine, New York, New York
- Veterans Affairs New York Harbor Healthcare Systems, New York, New York
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