1
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Gorini G, Fourati S, Vaccari M, Rahman MA, Gordon SN, Brown DR, Law L, Chang J, Green R, Barrenäs F, Liyanage NPM, Doster MN, Schifanella L, Bissa M, Silva de Castro I, Washington-Parks R, Galli V, Fuller DH, Santra S, Agy M, Pal R, Palermo RE, Tomaras GD, Shen X, LaBranche CC, Montefiori DC, Venzon DJ, Trinh HV, Rao M, Gale M, Sekaly RP, Franchini G. Engagement of monocytes, NK cells, and CD4+ Th1 cells by ALVAC-SIV vaccination results in a decreased risk of SIVmac251 vaginal acquisition. PLoS Pathog 2020; 16:e1008377. [PMID: 32163525 PMCID: PMC7093029 DOI: 10.1371/journal.ppat.1008377] [Citation(s) in RCA: 13] [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: 09/25/2019] [Revised: 03/24/2020] [Accepted: 02/03/2020] [Indexed: 12/12/2022] Open
Abstract
The recombinant Canarypox ALVAC-HIV/gp120/alum vaccine regimen was the first to significantly decrease the risk of HIV acquisition in humans, with equal effectiveness in both males and females. Similarly, an equivalent SIV-based ALVAC vaccine regimen decreased the risk of virus acquisition in Indian rhesus macaques of both sexes following intrarectal exposure to low doses of SIVmac251. Here, we demonstrate that the ALVAC-SIV/gp120/alum vaccine is also efficacious in female Chinese rhesus macaques following intravaginal exposure to low doses of SIVmac251 and we confirm that CD14+ classical monocytes are a strong correlate of decreased risk of virus acquisition. Furthermore, we demonstrate that the frequency of CD14+ cells and/or their gene expression correlates with blood Type 1 CD4+ T helper cells, α4β7+ plasmablasts, and vaginal cytocidal NKG2A+ cells. To better understand the correlate of protection, we contrasted the ALVAC-SIV vaccine with a NYVAC-based SIV/gp120 regimen that used the identical immunogen. We found that NYVAC-SIV induced higher immune activation via CD4+Ki67+CD38+ and CD4+Ki67+α4β7+ T cells, higher SIV envelope-specific IFN-γ producing cells, equivalent ADCC, and did not decrease the risk of SIVmac251 acquisition. Using the systems biology approach, we demonstrate that specific expression profiles of plasmablasts, NKG2A+ cells, and monocytes elicited by the ALVAC-based regimen correlated with decreased risk of virus acquisition.
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Affiliation(s)
- Giacomo Gorini
- Animal Models and Retroviral Vaccines Section, National Cancer Institute, Bethesda, Maryland, United States of America
| | - Slim Fourati
- Department of Pathology, Case Western Reserve University, Cleveland, Ohio, United States of America
| | - Monica Vaccari
- Animal Models and Retroviral Vaccines Section, National Cancer Institute, Bethesda, Maryland, United States of America
| | - Mohammad Arif Rahman
- Animal Models and Retroviral Vaccines Section, National Cancer Institute, Bethesda, Maryland, United States of America
| | - Shari N. Gordon
- Department of Infectious Diseases, GlaxoSmithKline R&D, Research Triangle Park, North Carolina, United States of America
| | - Dallas R. Brown
- Animal Models and Retroviral Vaccines Section, National Cancer Institute, Bethesda, Maryland, United States of America
| | - Lynn Law
- Department of Immunology, Center for Innate Immunity and Immune Disease, and Washington National Primate Research Center, University of Washington, Seattle, Washington, United States of America
| | - Jean Chang
- Department of Immunology, Center for Innate Immunity and Immune Disease, and Washington National Primate Research Center, University of Washington, Seattle, Washington, United States of America
| | - Richard Green
- Department of Immunology, Center for Innate Immunity and Immune Disease, and Washington National Primate Research Center, University of Washington, Seattle, Washington, United States of America
| | - Fredrik Barrenäs
- Department of Immunology, Center for Innate Immunity and Immune Disease, and Washington National Primate Research Center, University of Washington, Seattle, Washington, United States of America
| | - Namal P. M. Liyanage
- Animal Models and Retroviral Vaccines Section, National Cancer Institute, Bethesda, Maryland, United States of America
| | - Melvin N. Doster
- Animal Models and Retroviral Vaccines Section, National Cancer Institute, Bethesda, Maryland, United States of America
| | - Luca Schifanella
- Animal Models and Retroviral Vaccines Section, National Cancer Institute, Bethesda, Maryland, United States of America
| | - Massimiliano Bissa
- Animal Models and Retroviral Vaccines Section, National Cancer Institute, Bethesda, Maryland, United States of America
| | - Isabela Silva de Castro
- Animal Models and Retroviral Vaccines Section, National Cancer Institute, Bethesda, Maryland, United States of America
| | - Robyn Washington-Parks
- Animal Models and Retroviral Vaccines Section, National Cancer Institute, Bethesda, Maryland, United States of America
| | - Veronica Galli
- Animal Models and Retroviral Vaccines Section, National Cancer Institute, Bethesda, Maryland, United States of America
| | - Deborah H. Fuller
- Department of Immunology, Center for Innate Immunity and Immune Disease, and Washington National Primate Research Center, University of Washington, Seattle, Washington, United States of America
| | - Sampa Santra
- Beth Israel Deaconess Medical Center, Boston, Massachusetts, United States of America
| | - Michael Agy
- Division of Surgical Sciences, Duke University School of Medicine, Durham, North Carolina, United States of America
| | - Ranajit Pal
- Advanced Bioscience Laboratories, Rockville, Maryland, United States of America
| | - Robert E. Palermo
- Department of Immunology, Center for Innate Immunity and Immune Disease, and Washington National Primate Research Center, University of Washington, Seattle, Washington, United States of America
| | - Georgia D. Tomaras
- Division of Surgical Sciences, Duke University School of Medicine, Durham, North Carolina, United States of America
| | - Xiaoying Shen
- Division of Surgical Sciences, Duke University School of Medicine, Durham, North Carolina, United States of America
| | - Celia C. LaBranche
- Division of Surgical Sciences, Duke University School of Medicine, Durham, North Carolina, United States of America
| | - David C. Montefiori
- Division of Surgical Sciences, Duke University School of Medicine, Durham, North Carolina, United States of America
| | - David J. Venzon
- Biostatistics and Data Management Section, National Cancer Institute, Bethesda, Maryland, United States of America
| | - Hung V. Trinh
- U.S. Military HIV Research Program, Walter Reed Army Institute of Research, Silver Spring, Maryland, United States of America
| | - Mangala Rao
- U.S. Military HIV Research Program, Walter Reed Army Institute of Research, Silver Spring, Maryland, United States of America
| | - Michael Gale
- Department of Immunology, Center for Innate Immunity and Immune Disease, and Washington National Primate Research Center, University of Washington, Seattle, Washington, United States of America
| | - Rafick P. Sekaly
- Department of Pathology, Case Western Reserve University, Cleveland, Ohio, United States of America
| | - Genoveffa Franchini
- Animal Models and Retroviral Vaccines Section, National Cancer Institute, Bethesda, Maryland, United States of America
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2
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Wilmschen S, Schmitz JE, Kimpel J. Viral Vectors for the Induction of Broadly Neutralizing Antibodies against HIV. Vaccines (Basel) 2019; 7:vaccines7030119. [PMID: 31546894 PMCID: PMC6789710 DOI: 10.3390/vaccines7030119] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/13/2019] [Revised: 09/12/2019] [Accepted: 09/16/2019] [Indexed: 01/10/2023] Open
Abstract
Extensive research on generating an efficient HIV vaccine is ongoing. A major aim of HIV vaccines is the induction of long-lasting, broadly neutralizing antibodies (bnAbs) that can confer sterile immunity for a prolonged period of time. Several strategies have been explored to reach this goal, i.e. protein immunization, DNA, or viral vectors, or a combination thereof. In this review, we give an overview of approaches using viral vectors for the induction of HIV-specific bnAbs. Many pre-clinical studies were performed using various replication-competent and -incompetent vectors. Amongst them, poxviral and adenoviral vectors were the most prevalent ones. In many studies, viral vectors were combined with a DNA prime or a protein boost. However, neutralizing antibodies were mainly induced against the homologous HIV-1 vaccine strain or tier 1 viruses, and in rare cases, against tier 2 viruses, indicating the need for improved antigens and vaccination strategies. Furthermore, we also review next generation Env antigens that are currently being used in protein vaccination approaches and point out how they could be utilized in viral vectors.
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Affiliation(s)
- Sarah Wilmschen
- Division of Virology, Medical University of Innsbruck, Innsbruck 6020, Austria
| | - Joern E Schmitz
- Center for Virology and Vaccine Research, Beth Israel Deaconess Medical Center, Harvard Medical School, Boston, MA 02115, USA
| | - Janine Kimpel
- Division of Virology, Medical University of Innsbruck, Innsbruck 6020, Austria.
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3
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Kozlowski PA, Aldovini A. Mucosal Vaccine Approaches for Prevention of HIV and SIV Transmission. CURRENT IMMUNOLOGY REVIEWS 2019; 15:102-122. [PMID: 31452652 PMCID: PMC6709706 DOI: 10.2174/1573395514666180605092054] [Citation(s) in RCA: 23] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/11/2018] [Revised: 04/19/2018] [Accepted: 05/30/2018] [Indexed: 02/06/2023]
Abstract
Optimal protective immunity to HIV will likely require that plasma cells, memory B cells and memory T cells be stationed in mucosal tissues at portals of viral entry. Mucosal vaccine administration is more effective than parenteral vaccine delivery for this purpose. The challenge has been to achieve efficient vaccine uptake at mucosal surfaces, and to identify safe and effective adjuvants, especially for mucosally administered HIV envelope protein immunogens. Here, we discuss strategies used to deliver potential HIV vaccine candidates in the intestine, respiratory tract, and male and female genital tract of humans and nonhuman primates. We also review mucosal adjuvants, including Toll-like receptor agonists, which may adjuvant both mucosal humoral and cellular immune responses to HIV protein immunogens.
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Affiliation(s)
- Pamela A. Kozlowski
- Department of Microbiology, Immunology and Parasitology, Louisiana State University Health Sciences Center, New Orleans, LA 70112, USA
| | - Anna Aldovini
- Department of Medicine, and Harvard Medical School, Boston Children’s Hospital, Department of Pediatrics, Boston MA, 02115, USA
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4
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Gordon SN, Doster MN, Kines RC, Keele BF, Brocca-Cofano E, Guan Y, Pegu P, Liyanage NPM, Vaccari M, Cuburu N, Buck CB, Ferrari G, Montefiori D, Piatak M, Lifson JD, Xenophontos AM, Venzon D, Robert-Guroff M, Graham BS, Lowy DR, Schiller JT, Franchini G. Antibody to the gp120 V1/V2 loops and CD4+ and CD8+ T cell responses in protection from SIVmac251 vaginal acquisition and persistent viremia. JOURNAL OF IMMUNOLOGY (BALTIMORE, MD. : 1950) 2014; 193:6172-83. [PMID: 25398324 PMCID: PMC4335709 DOI: 10.4049/jimmunol.1401504] [Citation(s) in RCA: 30] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/12/2023]
Abstract
The human papillomavirus pseudovirions (HPV-PsVs) approach is an effective gene-delivery system that can prime or boost an immune response in the vaginal tract of nonhuman primates and mice. Intravaginal vaccination with HPV-PsVs expressing SIV genes, combined with an i.m. gp120 protein injection, induced humoral and cellular SIV-specific responses in macaques. Priming systemic immune responses with i.m. immunization with ALVAC-SIV vaccines, followed by intravaginal HPV-PsV-SIV/gp120 boosting, expanded and/or recruited T cells in the female genital tract. Using a stringent repeated low-dose intravaginal challenge with the highly pathogenic SIVmac251, we show that although these regimens did not demonstrate significant protection from virus acquisition, they provided control of viremia in a number of animals. High-avidity Ab responses to the envelope gp120 V1/V2 region correlated with delayed SIVmac251 acquisition, whereas virus levels in mucosal tissues were inversely correlated with antienvelope CD4(+) T cell responses. CD8(+) T cell depletion in animals with controlled viremia caused an increase in tissue virus load in some animals, suggesting a role for CD8(+) T cells in virus control. This study highlights the importance of CD8(+) cells and antienvelope CD4(+) T cells in curtailing virus replication and antienvelope V1/V2 Abs in preventing SIVmac251 acquisition.
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Affiliation(s)
- Shari N Gordon
- Animal Models and Retroviral Vaccines Section, National Cancer Institute, Bethesda, MD 20892
| | - Melvin N Doster
- Animal Models and Retroviral Vaccines Section, National Cancer Institute, Bethesda, MD 20892
| | - Rhonda C Kines
- Laboratory of Cellular Oncology, Center for Cancer Research, National Cancer Institute, Bethesda, MD 20982
| | - Brandon F Keele
- AIDS and Cancer Virus Program, Leidos Biomedical Research, Frederick National Laboratory for Cancer Research, Frederick, MD 21702
| | | | - Yongjun Guan
- Division of Basic Science and Vaccine Research, Institute of Human Virology, University of Maryland School of Medicine, Baltimore, MD 21201
| | - Poonam Pegu
- Animal Models and Retroviral Vaccines Section, National Cancer Institute, Bethesda, MD 20892
| | - Namal P M Liyanage
- Animal Models and Retroviral Vaccines Section, National Cancer Institute, Bethesda, MD 20892
| | - Monica Vaccari
- Animal Models and Retroviral Vaccines Section, National Cancer Institute, Bethesda, MD 20892
| | - Nicolas Cuburu
- Laboratory of Cellular Oncology, Center for Cancer Research, National Cancer Institute, Bethesda, MD 20982
| | - Christopher B Buck
- Laboratory of Cellular Oncology, Center for Cancer Research, National Cancer Institute, Bethesda, MD 20982
| | - Guido Ferrari
- Department of Surgery, Duke University Medical Center, Durham, NC 27710
| | - David Montefiori
- Department of Surgery, Duke University Medical Center, Durham, NC 27710
| | - Michael Piatak
- AIDS and Cancer Virus Program, Leidos Biomedical Research, Frederick National Laboratory for Cancer Research, Frederick, MD 21702
| | - Jeffrey D Lifson
- AIDS and Cancer Virus Program, Leidos Biomedical Research, Frederick National Laboratory for Cancer Research, Frederick, MD 21702
| | - Anastasia M Xenophontos
- Animal Models and Retroviral Vaccines Section, National Cancer Institute, Bethesda, MD 20892
| | - David Venzon
- Biostatistics and Data Management Section, National Cancer Institute, Bethesda, MD 20892; and
| | | | - Barney S Graham
- Vaccine Research Center, National Institute of Allergy and Infectious Diseases, Bethesda, MD 20892
| | - Douglas R Lowy
- Laboratory of Cellular Oncology, Center for Cancer Research, National Cancer Institute, Bethesda, MD 20982
| | - John T Schiller
- Laboratory of Cellular Oncology, Center for Cancer Research, National Cancer Institute, Bethesda, MD 20982
| | - Genoveffa Franchini
- Animal Models and Retroviral Vaccines Section, National Cancer Institute, Bethesda, MD 20892;
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5
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Poles J, Alvarez Y, Hioe CE. Induction of intestinal immunity by mucosal vaccines as a means of controlling HIV infection. AIDS Res Hum Retroviruses 2014; 30:1027-40. [PMID: 25354023 DOI: 10.1089/aid.2014.0233] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022] Open
Abstract
CD4(+) T cells in the mucosa of the gastrointestinal (GI) tract are preferentially targeted and depleted by HIV. As such, the induction of an effective anti-HIV immune response in the mucosa of the GI tract-through vaccination-could protect this vulnerable population of cells. Mucosal vaccination provides a promising means of inducing robust humoral and cellular responses in the GI tract. Here we review data from the literature about the effectiveness of various mucosal vaccination routes--oral (intraintestinal/tonsilar/sublingual), intranasal, and intrarectal--with regard to the induction of immune responses mediated by cytotoxic T cells and antibodies in the GI mucosa, as well as protective efficacy in challenge models. We present data from the literature indicating that mucosal routes have the potential to effectively elicit GI mucosal immunity and protect against challenge. Given their capacity for the induction of anti-HIV immune responses in the GI mucosa, we propose that mucosal routes, including the nonconventional sublingual, tonsilar, and intrarectal routes, be considered for the delivery of the next generation HIV vaccines. However, further studies are necessary to determine the ideal vectors and vaccination regimens for these routes of immunization and to validate their efficacy in controlling HIV infection.
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Affiliation(s)
- Jordan Poles
- Department of Microbiology, New York University School of Medicine, New York, New York
| | - Yelina Alvarez
- VA New York Harbor Healthcare System–Manhattan Campus and Department of Pathology, New York University School of Medicine, New York, New York
| | - Catarina E. Hioe
- VA New York Harbor Healthcare System–Manhattan Campus and Department of Pathology, New York University School of Medicine, New York, New York
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6
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Villarreal DO, Talbott KT, Choo DK, Shedlock DJ, Weiner DB. Synthetic DNA vaccine strategies against persistent viral infections. Expert Rev Vaccines 2013; 12:537-54. [PMID: 23659301 DOI: 10.1586/erv.13.33] [Citation(s) in RCA: 42] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/28/2022]
Abstract
The human body has developed an elaborate defense system against microbial pathogens and foreign antigens. However, particular microbes have evolved sophisticated mechanisms to evade immune surveillance, allowing persistence within the human host. In an effort to combat such infections, intensive research has focused on the development of effective prophylactic and therapeutic countermeasures to suppress or clear persistent viral infections. To date, popular therapeutic strategies have included the use of live-attenuated microbes, viral vectors and dendritic-cell vaccines aiming to help suppress or clear infection. In recent years, improved DNA vaccines have now re-emerged as a promising candidate for therapeutic intervention due to the development of advanced optimization and delivery technologies. For instance, genetic optimization of synthetic plasmid constructs and their encoded antigens, in vivo electroporation-mediated vaccine delivery, as well as codelivery with molecular adjuvants have collectively enhanced both transgene expression and the elicitation of vaccine-induced immunity. In addition, the development of potent heterologous prime-boost regimens has also provided significant contributions to DNA vaccine immunogenicity. Herein, the authors will focus on these recent improvements to this synthetic platform in relation to their application in combating persistent virus infection.
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Affiliation(s)
- Daniel O Villarreal
- University of Pennsylvania, Perelman School of Medicine, Department of Pathology & Laboratory Medicine, Philadelphia, PA 19104, USA
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7
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Sui Y, Gordon S, Franchini G, Berzofsky JA. Nonhuman primate models for HIV/AIDS vaccine development. ACTA ACUST UNITED AC 2013; 102:12.14.1-12.14.30. [PMID: 24510515 DOI: 10.1002/0471142735.im1214s102] [Citation(s) in RCA: 41] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/10/2023]
Abstract
The development of HIV vaccines has been hampered by the lack of an animal model that can accurately predict vaccine efficacy. Chimpanzees can be infected with HIV-1 but are not practical for research. However, several species of macaques are susceptible to the simian immunodeficiency viruses (SIVs) that cause disease in macaques, which also closely mimic HIV in humans. Thus, macaque-SIV models of HIV infection have become a critical foundation for AIDS vaccine development. Here we examine the multiple variables and considerations that must be taken into account in order to use this nonhuman primate (NHP) model effectively. These include the species and subspecies of macaques, virus strain, dose and route of administration, and macaque genetics, including the major histocompatibility complex molecules that affect immune responses, and other virus restriction factors. We illustrate how these NHP models can be used to carry out studies of immune responses in mucosal and other tissues that could not easily be performed on human volunteers. Furthermore, macaques are an ideal model system to optimize adjuvants, test vaccine platforms, and identify correlates of protection that can advance the HIV vaccine field. We also illustrate techniques used to identify different macaque lymphocyte populations and review some poxvirus vaccine candidates that are in various stages of clinical trials. Understanding how to effectively use this valuable model will greatly increase the likelihood of finding a successful vaccine for HIV.
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Affiliation(s)
- Yongjun Sui
- Vaccine Branch, Center for Cancer Research, National Cancer Institute, Bethesda, Maryland.,These authors contributed equally
| | - Shari Gordon
- Vaccine Branch, Center for Cancer Research, National Cancer Institute, Bethesda, Maryland.,These authors contributed equally
| | - Genoveffa Franchini
- Vaccine Branch, Center for Cancer Research, National Cancer Institute, Bethesda, Maryland.,These authors contributed equally
| | - Jay A Berzofsky
- Vaccine Branch, Center for Cancer Research, National Cancer Institute, Bethesda, Maryland.,These authors contributed equally
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8
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Vaccari M, Keele BF, Bosinger SE, Doster MN, Ma ZM, Pollara J, Hryniewicz A, Ferrari G, Guan Y, Forthal DN, Venzon D, Fenizia C, Morgan T, Montefiori D, Lifson JD, Miller CJ, Silvestri G, Rosati M, Felber BK, Pavlakis GN, Tartaglia J, Franchini G. Protection afforded by an HIV vaccine candidate in macaques depends on the dose of SIVmac251 at challenge exposure. J Virol 2013; 87:3538-48. [PMID: 23325681 PMCID: PMC3592147 DOI: 10.1128/jvi.02863-12] [Citation(s) in RCA: 47] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/18/2012] [Accepted: 01/07/2013] [Indexed: 01/10/2023] Open
Abstract
We used the simian immunodeficiency virus mac251 (SIV(mac251)) macaque model to study the effect of the dose of mucosal exposure on vaccine efficacy. We immunized macaques with a DNA prime followed by SIV gp120 protein immunization with ALVAC-SIV and gp120 in alum, and we challenged them with SIV(mac251) at either a single high dose or at two repeated low-dose exposures to a 10-fold-lower dose. Infection was neither prevented nor modified following a single high-dose challenge of the immunized macaques. However, two exposures to a 10-fold-lower dose resulted in protection from SIV(mac251) acquisition in 3 out of 12 macaques. The remaining animals that were infected had a modulated pathogenesis, significant downregulation of interferon responsive genes, and upregulation of genes involved in B- and T-cell responses. Thus, the choice of the experimental model greatly influences the vaccine efficacy of vaccines for human immunodeficiency virus (HIV).
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Affiliation(s)
- Monica Vaccari
- Animal Models and Retroviral Vaccine Section, National Cancer Institute, Bethesda, Maryland, USA
| | - Brandon F. Keele
- AIDS and Cancer Virus Program, SAIC Frederick, Inc., Frederick National Laboratory for Cancer Research, Frederick, Maryland, USA
| | - Steven E. Bosinger
- Yerkes National Primate Research Center, Emory Vaccine Center, Emory University, Atlanta, Georgia, USA
| | - Melvin N. Doster
- Animal Models and Retroviral Vaccine Section, National Cancer Institute, Bethesda, Maryland, USA
| | - Zhong-Min Ma
- California National Primate Research Center, University of California Davis, Davis, California, USA
| | - Justin Pollara
- Department of Surgery, Duke University, Durham, North Carolina, USA
| | - Anna Hryniewicz
- Animal Models and Retroviral Vaccine Section, National Cancer Institute, Bethesda, Maryland, USA
| | - Guido Ferrari
- Department of Surgery, Duke University, Durham, North Carolina, USA
| | - Yongjun Guan
- Institute of Human Virology and Department of Microbiology & Immunology, University of Maryland School of Medicine, Baltimore, Maryland, USA
| | | | - David Venzon
- Biostatistics and Data Management Section, National Cancer Institute, National Institutes of Health, Bethesda, Maryland, USA
| | - Claudio Fenizia
- Animal Models and Retroviral Vaccine Section, National Cancer Institute, Bethesda, Maryland, USA
| | - Tia Morgan
- Animal Models and Retroviral Vaccine Section, National Cancer Institute, Bethesda, Maryland, USA
| | - David Montefiori
- Department of Surgery, Duke University, Durham, North Carolina, USA
| | - Jeffrey D. Lifson
- AIDS and Cancer Virus Program, SAIC Frederick, Inc., Frederick National Laboratory for Cancer Research, Frederick, Maryland, USA
| | - Chris J. Miller
- California National Primate Research Center, University of California Davis, Davis, California, USA
| | - Guido Silvestri
- Yerkes National Primate Research Center, Emory Vaccine Center, Emory University, Atlanta, Georgia, USA
| | | | - Barbara K. Felber
- Human Retrovirus Pathogenesis Section, Frederick National Laboratory for Cancer Research, Frederick, Maryland, USA
| | | | | | - Genoveffa Franchini
- Animal Models and Retroviral Vaccine Section, National Cancer Institute, Bethesda, Maryland, USA
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9
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Antibodies with high avidity to the gp120 envelope protein in protection from simian immunodeficiency virus SIV(mac251) acquisition in an immunization regimen that mimics the RV-144 Thai trial. J Virol 2012; 87:1708-19. [PMID: 23175374 DOI: 10.1128/jvi.02544-12] [Citation(s) in RCA: 118] [Impact Index Per Article: 9.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
The recombinant canarypox vector, ALVAC-HIV, together with human immunodeficiency virus (HIV) gp120 envelope glycoprotein, has protected 31.2% of Thai individuals from HIV acquisition in the RV144 HIV vaccine trial. This outcome was unexpected, given the limited ability of the vaccine components to induce CD8(+) T-cell responses or broadly neutralizing antibodies. We vaccinated macaques with an immunization regimen intended to mimic the RV144 trial and exposed them intrarectally to a dose of the simian immunodeficiency virus SIV(mac251) that transmits few virus variants, similar to HIV transmission to humans. Vaccination induced anti-envelope antibodies in all vaccinees and CD4(+) and CD8(+) T-cell responses. Three of the 11 macaques vaccinated with ALVAC-SIV/gp120 were protected from SIV(mac251) acquisition, but the result was not significant. The remaining vaccinees were infected and progressed to disease. The magnitudes of vaccine-induced SIV(mac251)-specific T-cell responses and binding antibodies were not significantly different between protected and infected animals. However, sera from protected animals had higher avidity antibodies to gp120, recognized the variable envelope regions V1/V2, and reduced SIV(mac251) infectivity in cells that express high levels of α(4)β(7) integrins, suggesting a functional role of antibodies to V2. The current results emphasize the utility of determining the titer of repeated mucosal challenge in the preclinical evaluation of HIV vaccines.
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10
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Potent and broadly reactive HIV-2 neutralizing antibodies elicited by a vaccinia virus vector prime-C2V3C3 polypeptide boost immunization strategy. J Virol 2010; 84:12429-36. [PMID: 20844029 DOI: 10.1128/jvi.01102-10] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023] Open
Abstract
Human immunodeficiency virus type 2 (HIV-2) infection affects about 1 to 2 million individuals, the majority living in West Africa, Europe, and India. As for HIV-1, new strategies for the prevention of HIV-2 infection are needed. Our aim was to produce new vaccine immunogens that elicit the production of broadly reactive HIV-2 neutralizing antibodies (NAbs). Native and truncated envelope proteins from the reference HIV-2ALI isolate were expressed in vaccinia virus or in bacteria. This source isolate was used due to its unique phenotype combining CD4 independence and CCR5 usage. NAbs were not elicited in BALB/c mice by single immunization with a truncated and fully glycosylated envelope gp125 (gp125t) or a recombinant polypeptide comprising the C2, V3, and C3 envelope regions (rpC2-C3). A strong and broad NAb response was, however, elicited in mice primed with gp125t expressed in vaccinia virus and boosted with rpC2-C3. Serum from these animals potently neutralized (median 50% neutralizing titer, 3,200) six of six highly divergent primary HIV-2 isolates. Coreceptor usage and the V3 sequence of NAb-sensitive isolates were similar to that of the vaccinating immunogen (HIV-2ALI). In contrast, NAbs were not reactive on three X4 isolates that displayed major changes in V3 loop sequence and structure. Collectively, our findings demonstrate that broadly reactive HIV-2 NAbs can be elicited by using a vaccinia virus vector-prime/rpC2-C3-boost immunization strategy and suggest a potential relationship between escape to neutralization and cell tropism.
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11
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Vaccari M, Poonam P, Franchini G. Phase III HIV vaccine trial in Thailand: a step toward a protective vaccine for HIV. Expert Rev Vaccines 2010; 9:997-1005. [PMID: 20822342 PMCID: PMC7337582 DOI: 10.1586/erv.10.104] [Citation(s) in RCA: 42] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Abstract
The large human efficacy trail in Thailand, RV144, was concluded in the summer of 2009. This is the first Phase III trial to show limited, but significant, efficacy in preventing HIV acquisition. This trial represents the first sign that a preventive vaccine for HIV may be feasible. The vaccine regimen tested in Thailand consisted of priming with a Canarypox vector carrying three synthetic HIV genes. The priming was followed by booster inoculations with two recombinant envelope proteins from HIV, clade B and E. The need to understand the role in protection from HIV acquisition of the new responses, induced by this vaccine combination, has brought together many researchers with the common goal of improving the development of a safe and effective vaccine for HIV.
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Affiliation(s)
- Monica Vaccari
- Animal Models and Retroviral Vaccine Section, National Cancer Institute, National Institutes of Health, Bethesda, MD 20892, USA
| | - Poonam Poonam
- Animal Models and Retroviral Vaccine Section, National Cancer Institute, National Institutes of Health, Bethesda, MD 20892, USA
| | - Genoveffa Franchini
- Animal Models and Retroviral Vaccine Section, National Cancer Institute, National Institutes of Health, Bethesda, MD 20892, USA
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12
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Wild J, Bieler K, Köstler J, Frachette MJ, Jeffs S, Vieira S, Esteban M, Liljeström P, Pantaleo G, Wolf H, Wagner R. Preclinical evaluation of the immunogenicity of C-type HIV-1-based DNA and NYVAC vaccines in the Balb/C mouse model. Viral Immunol 2009; 22:309-19. [PMID: 19811088 DOI: 10.1089/vim.2009.0038] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022] Open
Abstract
As part of a European initiative (EuroVacc), we report the design, construction, and immunogenicity of two HIV-1 vaccine candidates based on a clade C virus strain (CN54) representing the current major epidemic in Asia and parts of Africa. Open reading frames encoding an artificial 160-kDa GagPolNef (GPN) polyprotein and the external glycoprotein gp120 were fully RNA and codon optimized. A DNA vaccine (DNA-GPN and DNA-gp120, referred to as DNA-C), and a replication-deficient vaccinia virus encoding both reading frames (NYVAC-C), were assessed regarding immunogenicity in Balb/C mice. The intramuscular administration of both plasmid DNA constructs, followed by two booster DNA immunizations, induced substantial T-cell responses against both antigens as well as Env-specific antibodies. Whereas low doses of NYVAC-C failed to induce specific CTL or antibodies, high doses generated cellular as well as humoral immune responses, but these did not reach the levels seen following DNA vaccination. The most potent immune responses were detectable using prime:boost protocols, regardless of whether DNA-C or NYVAC-C was used as the priming or boosting agent. These preclinical findings revealed the immunogenic response triggered by DNA-C and its enhancement by combining it with NYVAC-C, thus complementing the macaque preclinical and human phase I clinical studies of EuroVacc.
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Affiliation(s)
- Jens Wild
- Institute of Medical Microbiology, University of Regensburg, Regensburg, Germany
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13
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Evaluation of recombinant influenza virus-simian immunodeficiency virus vaccines in macaques. J Virol 2009; 83:7619-28. [PMID: 19439474 DOI: 10.1128/jvi.00470-09] [Citation(s) in RCA: 30] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
There is an urgent need for human immunodeficiency virus (HIV) vaccines that induce robust mucosal immunity. Influenza A viruses (both H1N1 and H3N2) were engineered to express simian immunodeficiency virus (SIV) CD8 T-cell epitopes and evaluated following administration to the respiratory tracts of 11 pigtail macaques. Influenza virus was readily detected from respiratory tract secretions, although the infections were asymptomatic. Animals seroconverted to influenza virus and generated CD8 and CD4 T-cell responses to influenza virus proteins. SIV-specific CD8 T-cell responses bearing the mucosal homing marker beta7 integrin were induced by vaccination of naïve animals. Further, SIV-specific CD8 T-cell responses could be boosted by recombinant influenza virus-SIV vaccination of animals with already-established SIV infection. Sequential vaccination with influenza virus-SIV recombinants of different subtypes (H1N1 followed by H3N2 or vice versa) produced only a limited boost in immunity, probably reflecting T-cell immunity to conserved internal proteins of influenza A virus. SIV challenge of macaques vaccinated with an influenza virus expressing a single SIV CD8 T cell resulted in a large anamnestic recall CD8 T-cell response, but immune escape rapidly ensued and there was no impact on chronic SIV viremia. Although our results suggest that influenza virus-HIV vaccines hold promise for the induction of mucosal immunity to HIV, broader antigen cover will be needed to limit cytotoxic T-lymphocyte escape.
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Schoenly KA, Weiner DB. Human immunodeficiency virus type 1 vaccine development: recent advances in the cytotoxic T-lymphocyte platform "spotty business". J Virol 2008; 82:3166-80. [PMID: 17989174 PMCID: PMC2268479 DOI: 10.1128/jvi.01634-07] [Citation(s) in RCA: 26] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Affiliation(s)
- Kimberly A Schoenly
- Department of Pathology and Laboratory Medicine, University of Pennsylvania School of Medicine, Philadelphia, Pennsylvania, USA
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15
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Pal R, Venzon D, Santra S, Kalyanaraman VS, Montefiori DC, Hocker L, Hudacik L, Rose N, Nacsa J, Edghill-Smith Y, Moniuszko M, Hel Z, Belyakov IM, Berzofsky JA, Parks RW, Markham PD, Letvin NL, Tartaglia J, Franchini G. Systemic immunization with an ALVAC-HIV-1/protein boost vaccine strategy protects rhesus macaques from CD4+ T-cell loss and reduces both systemic and mucosal simian-human immunodeficiency virus SHIVKU2 RNA levels. J Virol 2006; 80:3732-42. [PMID: 16571790 PMCID: PMC1440474 DOI: 10.1128/jvi.80.8.3732-3742.2006] [Citation(s) in RCA: 59] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
Transmission of human immunodeficiency virus type 1 (HIV-1) occurs primarily via the mucosal route, suggesting that HIV-1 vaccines may need to elicit mucosal immune responses. Here, we investigated the immunogenicity and relative efficacy of systemic immunization with two human ALVAC-HIV-1 recombinant vaccines expressing Gag, Pol, and gp120 (vCP250) or Gag, Pol, and gp160 (vCP1420) in a prime-boost protocol with their homologous vaccine native Env proteins. The relative efficacy was measured against a high-dose mucosal exposure to the pathogenic neutralization-resistant variant SHIV(KU2) (simian-human immunodeficiency virus). Systemic immunization with both vaccine regimens decreased viral load levels not only in blood but unexpectedly also in mucosal sites and protected macaques from peripheral CD4+ T-cell loss. This protective effect was stronger when the gp120 antigen was included in the vaccine. Inclusion of recombinant Tat protein in the boosting phase along with the Env protein did not contribute further to the preservation of CD4+ T cells. Thus, systemic immunization with ALVAC-HIV-1 vaccine candidates elicits anti-HIV-1 immune responses able to contain virus replication also at mucosal sites in macaques.
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Affiliation(s)
- Ranajit Pal
- Advanced BioScience Laboratories, Inc., Kensington, Maryland 20895, USA
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16
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Ascón MA, Ochoa-Repáraz J, Walters N, Pascual DW. Partially assembled K99 fimbriae are required for protection. Infect Immun 2005; 73:7274-80. [PMID: 16239523 PMCID: PMC1273889 DOI: 10.1128/iai.73.11.7274-7280.2005] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
Antibodies to K99 fimbriae afford protection to F5+ bovine enterotoxigenic Escherichia coli (ETEC). Previous studies show that murine dams immunized with Salmonella vaccine vectors stably expressing K99 fimbriae confer protection to ETEC-challenged neonatal pups. To begin to address adaptation of the K99 scaffold to display heterologous B- and T-cell epitopes, studies were conducted to determine how much of the assembled K99 fimbria is required to maintain protective immunity. Sequential deletions in the K99 gene clusters were made, resulting in diminished localization of the K99 fimbrial subunit in the outer membrane. As placement of the K99 fimbrial subunit became progressively contained within the vaccine vector, diminished immunoglobulin A (IgA) and IgG1 antibody titers, as well as diminished Th2-type cytokine responses, were observed in orally immunized mice. Deletion of fanGH, which greatly reduced the export of the fimbrial subunit to the outer membrane, showed only partial reduction in protective immunity. By contrast, deletion of fanDEFGH, which also reduced the export of the fimbrial subunit to the outer membrane but retained more subunit in the cytoplasm, resulted in protective immunity being dramatically reduced. Thus, these studies showed that retention of K99 fimbrial subunit as native fimbriae or with the deletion of fanGH is sufficient to confer protection.
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MESH Headings
- Animals
- Animals, Newborn
- Antibodies, Bacterial/blood
- Antigens, Surface/chemistry
- Antigens, Surface/genetics
- Antigens, Surface/immunology
- Bacterial Toxins/chemistry
- Bacterial Toxins/genetics
- Bacterial Toxins/immunology
- Colostrum/immunology
- Feces
- Female
- Fimbriae Proteins/chemistry
- Fimbriae Proteins/genetics
- Fimbriae Proteins/immunology
- Fimbriae, Bacterial/chemistry
- Fimbriae, Bacterial/genetics
- Fimbriae, Bacterial/immunology
- Gene Expression Regulation, Bacterial
- Immunity, Mucosal/immunology
- Male
- Mice
- Mice, Inbred BALB C
- Mutation
- Protein Transport
- Salmonella Infections/immunology
- Salmonella Infections/prevention & control
- Salmonella Vaccines/chemistry
- Salmonella Vaccines/immunology
- Th2 Cells/immunology
- Vaccination
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Affiliation(s)
- Miguel A Ascón
- Veterinary Molecular Biology, Montana State University, Bozeman, MT 59717-3610, USA
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17
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Amara RR, Patel K, Niedziela G, Nigam P, Sharma S, Staprans SI, Montefiori DC, Chenareddi L, Herndon JG, Robinson HL, McClure HM, Novembre FJ. A combination DNA and attenuated simian immunodeficiency virus vaccine strategy provides enhanced protection from simian/human immunodeficiency virus-induced disease. J Virol 2005; 79:15356-67. [PMID: 16306607 PMCID: PMC1315994 DOI: 10.1128/jvi.79.24.15356-15367.2005] [Citation(s) in RCA: 18] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/22/2005] [Accepted: 09/15/2005] [Indexed: 11/20/2022] Open
Abstract
Among the most effective vaccine candidates tested in the simian immunodeficiency virus (SIV)/macaque system, live attenuated viruses have been shown to provide the best protection from challenge. To investigate if preimmunization would increase the level of protection afforded by live attenuated SIVmac239Deltanef (Deltanef), macaques were given two priming immunizations of DNA encoding SIV Gag and Pol proteins, with control macaques receiving vector DNA immunizations. In macaques receiving the SIV DNA inoculation, SIV-specific cellular but not humoral responses were readily detectable 2 weeks after the second DNA inoculation. Following boosting with live attenuated virus, control of Deltanef replication was superior in SIV-DNA-primed macaques versus vector-DNA-primed macaques and was correlated with higher levels of CD8+/gamma-interferon-positive and/or interleukin-2-positive cells. Challenge with an intravenous inoculation of simian/human immunodeficiency virus (SHIV) strain SHIV89.6p resulted in infection of all animals. However, macaques receiving SIV DNA as the priming immunizations had statistically lower viral loads than control animals and did not develop signs of disease, whereas three of seven macaques receiving vector DNA showed severe CD4+ T-cell decline, with development of AIDS in one of these animals. No correlation of immune responses to protection from disease could be derived from our analyses. These results demonstrate that addition of a DNA prime to a live attenuated virus provided better protection from disease following challenge than live attenuated virus alone.
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Affiliation(s)
- Rama Rao Amara
- Divisions of Microbiology and Immunology, Yerkes National Primate Research Center, Emory University, 954 N. Gatewood Rd., Atlanta, GA 30329, USA
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18
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Edupuganti S, Weber D, Poole C. Cytotoxic T-lymphocyte responses to canarypox vector-based HIV vaccines in HIV-seronegative individuals: a meta-analysis of published studies. HIV CLINICAL TRIALS 2005; 5:259-68. [PMID: 15562366 DOI: 10.1310/w9j3-0ptb-fx1v-y3fx] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Abstract
PURPOSE A successful prophylactic HIV vaccine will probably require neutralizing antibodies and vigorous CTL (CD8+ T-cytotoxic lymphocyte) responses. Canarypox vector-based HIV vaccines (ALVAC-HIV) have been gaining momentum as promising HIV vaccine candidates because of their ability to elicit CTL responses. This quantitative meta-analysis was undertaken to determine a summary estimate of CTL responses to ALVAC-HIV vaccines in HIV-1 seronegative volunteers and to identify reasons for differences among studies in the estimated effects on CTL responses. METHOD After a literature search and data abstraction, eight randomized, double-blind, placebo-controlled studies were selected for meta-analysis. Stratified and random effects meta-regression analyses were performed to search for response differences among studies. RESULTS Of the various study characteristics, the number of immunizations and the vaccine dose were associated with the likelihood of developing CTL responses. It was not possible to distinguish the effect of either the number of immunizations or the vaccine dose on CTL responses because these two study characteristics were highly associated with each other. CONCLUSION More trials are warranted to determine the ideal dose/immunization schedule that would elicit maximal CTL responses.
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Affiliation(s)
- Srilatha Edupuganti
- School of Medicine, Division of Infectious Diseases, University of North Carolina at Chapel Hill, 130 Mason Farm Road, Chapel Hill, NC 27599-7040, USA.
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19
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Affiliation(s)
- John G McNeil
- National Institute of Allergy and Infectious Diseases, Bethesda, MD 20892, and 2Walter Reed Army Institute of Research, Washington, DC 20307, USA.
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20
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Abstract
This article gives an overview about the development of an HIV-1 vaccine. Tremendous numbers of papers have been published on this topic during the last 10 years, and this article can only touch on the different directions taken toward the development of an HIV-1 vaccine, and not give a complete overview of the entire field.
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Affiliation(s)
- James P McGettigan
- Department of Biochemistry and Molecular Pharmacology, Dorrance H. Hamilton Laboratories, Center for Human Virology, Philadelphia, PA 19107-6799, USA
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21
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Evans DT, Chen LM, Gillis J, Lin KC, Harty B, Mazzara GP, Donis RO, Mansfield KG, Lifson JD, Desrosiers RC, Galán JE, Johnson RP. Mucosal priming of simian immunodeficiency virus-specific cytotoxic T-lymphocyte responses in rhesus macaques by the Salmonella type III secretion antigen delivery system. J Virol 2003; 77:2400-9. [PMID: 12551977 PMCID: PMC141091 DOI: 10.1128/jvi.77.4.2400-2409.2003] [Citation(s) in RCA: 89] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
Nearly all human immunodeficiency virus (HIV) infections are acquired mucosally, and the gut-associated lymphoid tissues are important sites for early virus replication. Thus, vaccine strategies designed to prime virus-specific cytotoxic T lymphocyte (CTL) responses that home to mucosal compartments may be particularly effective at preventing or containing HIV infection. The Salmonella type III secretion system has been shown to be an effective approach for stimulating mucosal CTL responses in mice. We therefore tested DeltaphoP-phoQ attenuated strains of Salmonella enterica serovar Typhimurium and S. enterica serovar Typhi expressing fragments of the simian immunodeficiency virus (SIV) Gag protein fused to the type III-secreted SopE protein for the ability to prime virus-specific CTL responses in rhesus macaques. Mamu-A*01(+) macaques were inoculated with three oral doses of recombinant Salmonella, followed by a peripheral boost with modified vaccinia virus Ankara expressing SIV Gag (MVA Gag). Transient low-level CTL responses to the Mamu-A*01 Gag(181-189) epitope were detected following each dose of Salmonella. After boosting with MVA Gag, strong Gag-specific CTL responses were consistently detected, and tetramer staining revealed the expansion of Gag(181-189)-specific CD8(+) T-cell responses in peripheral blood. A significant percentage of the Gag(181-189)-specific T-cell population in each animal also expressed the intestinal homing receptor alpha4beta7. Additionally, Gag(181-189)-specific CD8(+) T cells were detected in lymphocytes isolated from the colon. Yet, despite these responses, Salmonella-primed/MVA-boosted animals did not exhibit improved control of virus replication following a rectal challenge with SIVmac239. Nevertheless, this study demonstrates the potential of mucosal priming by the Salmonella type III secretion system to direct SIV-specific cellular immune responses to the gastrointestinal mucosa in a primate model.
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Affiliation(s)
- David T Evans
- New England Regional Primate Research Center, Harvard Medical School, One Pine Hill Drive, Southborough, MA 01772-9102, USA
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22
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Abstract
Development of a prophylactic human immunodeficiency virus type 1 (HIV-1) vaccine is a leading priority in biomedical research. Much of this work has been done with the nonhuman primate model of AIDS. In a historical context, vaccine studies, which use this model, are summarized and discussed.
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Affiliation(s)
- Stephen M Smith
- Saint Michael's Medical Center and The New Jersey Medical School - UMDNJ, Newark, NJ, USA.
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23
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Pal R, Venzon D, Letvin NL, Santra S, Montefiori DC, Miller NR, Tryniszewska E, Lewis MG, VanCott TC, Hirsch V, Woodward R, Gibson A, Grace M, Dobratz E, Markham PD, Hel Z, Nacsa J, Klein M, Tartaglia J, Franchini G. ALVAC-SIV-gag-pol-env-based vaccination and macaque major histocompatibility complex class I (A*01) delay simian immunodeficiency virus SIVmac-induced immunodeficiency. J Virol 2002; 76:292-302. [PMID: 11739694 PMCID: PMC135699 DOI: 10.1128/jvi.76.1.292-302.2002] [Citation(s) in RCA: 205] [Impact Index Per Article: 9.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
T-cell-mediated immune effector mechanisms play an important role in the containment of human immunodeficiency virus/simian immunodeficiency virus (HIV/SIV) replication after infection. Both vaccination- and infection-induced T-cell responses are dependent on the host major histocompatibility complex classes I and II (MHC-I and MHC-II) antigens. Here we report that both inherent, host-dependent immune responses to SIVmac251 infection and vaccination-induced immune responses to viral antigens were able to reduce virus replication and/or CD4+ T-cell loss. Both the presence of the MHC-I Mamu-A*01 genotype and vaccination of rhesus macaques with ALVAC-SIV-gag-pol-env (ALVAC-SIV-gpe) contributed to the restriction of SIVmac251 replication during primary infection, preservation of CD4+ T cells, and delayed disease progression following intrarectal challenge exposure of the animals to SIV(mac251 (561)). ALVAC-SIV-gpe immunization induced cytotoxic T-lymphocyte (CTL) responses cumulatively in 67% of the immunized animals. Following viral challenge, a significant secondary virus-specific CD8+ T-cell response was observed in the vaccinated macaques. In the same immunized macaques, a decrease in virus load during primary infection (P = 0.0078) and protection from CD4 loss during both acute and chronic phases of infection (P = 0.0099 and P = 0.03, respectively) were observed. A trend for enhanced survival of the vaccinated macaques was also observed. Neither boosting the ALVAC-SIV-gpe with gp120 immunizations nor administering the vaccine by the combination of mucosal and systemic immunization routes increased significantly the protective effect of the ALVAC-SIV-gpe vaccine. While assessing the role of MHC-I Mamu-A*01 alone in the restriction of viremia following challenge of nonvaccinated animals with other SIV isolates, we observed that the virus load was not significantly lower in Mamu-A*01-positive macaques following intravenous challenge with either SIV(mac251 (561)) or SIV(SME660). However, a significant delay in CD4+ T-cell loss was observed in Mamu-A*01-positive macaques in each group. Of interest, in the case of intravenous or intrarectal challenge with the chimeric SIV/HIV strains SHIV(89.6P) or SHIV(KU2), respectively, MHC-I Mamu-A*01-positive macaques did not significantly restrict primary viremia. The finding of the protective effect of the Mamu-A*01 molecule parallels the protective effect of the B*5701 HLA allele in HIV-1-infected humans and needs to be accounted for in the evaluation of vaccine efficacy against SIV challenge models.
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Affiliation(s)
- R Pal
- Advanced BioScience Laboratories, Inc., Kensington, Maryland 20895, USA
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24
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Hel Z, Tsai WP, Thornton A, Nacsa J, Giuliani L, Tryniszewska E, Poudyal M, Venzon D, Wang X, Altman J, Watkins DI, Lu W, von Gegerfelt A, Felber BK, Tartaglia J, Pavlakis GN, Franchini G. Potentiation of simian immunodeficiency virus (SIV)-specific CD4(+) and CD8(+) T cell responses by a DNA-SIV and NYVAC-SIV prime/boost regimen. JOURNAL OF IMMUNOLOGY (BALTIMORE, MD. : 1950) 2001; 167:7180-91. [PMID: 11739541 DOI: 10.4049/jimmunol.167.12.7180] [Citation(s) in RCA: 81] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
Abstract
T cell-mediated immune responses play an important role in the containment of HIV-1 replication. Therefore, an effective vaccine against HIV-1 should be able to elicit high frequencies of virus-specific CD8(+) and CD4(+) T cells. The highly attenuated poxvirus-based vaccine candidate, NYVAC-SIV-gag-pol-env (NYVAC-SIV-gpe), has been shown to induce and/or expand SIV-specific CD4(+) and CD8(+) T cell responses in both naive and infected macaques. In this study, the immunogenicity of NYVAC-SIV-gpe alone was compared with a combination regimen where priming with an optimized DNA-SIV-gag-env vaccine candidate was followed by a NYVAC-SIV-gpe boost. In macaques immunized with the prime-boost regimen, the extent and durability of CD8(+) T cell response to an immunodominant SIV gag epitope was increased and these animals recognized a broader array of subdominant SIV epitopes in the cytolytic assay. In addition, the prime-boost regimen significantly enhanced the proliferative responses to both SIV gag and env proteins. Thus, the combination of these vaccine modalities may represent a valuable strategy in the development of a vaccine for HIV.
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Affiliation(s)
- Z Hel
- Basic Research Laboratory and Biostatistics and Data Management Section, National Cancer Institute, Bethesda, MD 20892, USA
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25
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Shata MT, Reitz MS, DeVico AL, Lewis GK, Hone DM. Mucosal and systemic HIV-1 Env-specific CD8(+) T-cells develop after intragastric vaccination with a Salmonella Env DNA vaccine vector. Vaccine 2001; 20:623-9. [PMID: 11672930 DOI: 10.1016/s0264-410x(01)00330-9] [Citation(s) in RCA: 57] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
Abstract
CD8(+) T-cell responses provide beneficial antiviral immunity against human immunodeficiency virus 1 (HIV-1). In this study, we show that intragastric vaccination with a Salmonella HIV-1 Env DNA vaccine vector generates Env-specific CD8(+) T-cells, both in mucosal and systemic lymphoid tissue. By contrast, intramuscular vaccination with the Env DNA vaccine alone only induced systemic CD8(+) T-cells. To our knowledge, this is the first report showing both mucosal and systemic CD8(+) T-cell responses following vaccination with a Salmonella vaccine vector. These data suggest that this mode of HIV-1 DNA vaccine delivery will be advantageous over parenterally administered HIV-1 DNA vaccines.
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Affiliation(s)
- M T Shata
- Virology Laboratory, Lindsley F. Kimball Research Institute, New York Blood Center, New York, NY 10021, USA
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26
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Shata MT, Hone DM. Vaccination with a Shigella DNA vaccine vector induces antigen-specific CD8(+) T cells and antiviral protective immunity. J Virol 2001; 75:9665-70. [PMID: 11559798 PMCID: PMC114537 DOI: 10.1128/jvi.75.20.9665-9670.2001] [Citation(s) in RCA: 57] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
A prototype Shigella human immunodeficiency virus type 1 (HIV-1) gp120 DNA vaccine vector was constructed and evaluated for immunogenicity in a murine model. For comparative purposes, mice were also vaccinated with a vaccinia virus-env (vaccinia-env) vector or the gp120 DNA vaccine alone. Enumeration of the CD8(+)-T-cell responses to gp120 after vaccination using a gamma interferon enzyme-linked spot assay revealed that a single intranasal dose of the Shigella HIV-1 gp120 DNA vaccine vector elicited a CD8(+) T-cell response to gp120, the magnitude of which was comparable to the sizes of the analogous responses to gp120 that developed in mice vaccinated intraperitoneally with the vaccinia-env vector or intramuscularly with the gp120 DNA vaccine. In addition, a single dose of the Shigella gp120 DNA vaccine vector afforded significant protection against a vaccinia-env challenge. Moreover, the number of vaccinia-env PFU recovered in mice vaccinated intranasally with the Shigella vector was about fivefold less than the number recovered from mice vaccinated intramuscularly with the gp120 DNA vaccine. Since the Shigella vector did not express detectable levels of gp120, this report confirms that Shigella vectors are capable of delivering passenger DNA vaccines to host cells and inducing robust CD8(+) T-cell responses to antigens expressed by the DNA vaccines. Furthermore, to our knowledge, this is the first documentation of antiviral protective immunity following vaccination with a live Shigella DNA vaccine vector.
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Affiliation(s)
- M T Shata
- Division of Vaccine Research, Institute of Human Virology, University of Maryland Biotechnology Institute, Baltimore, Maryland 21201, USA
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27
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Walther-Jallow L, Nilsson C, Söderlund J, Ten Haaft P, Mäkitalo B, Biberfeld P, Böttiger P, Heeney J, Biberfeld G, Thorstensson R. Cross-protection against mucosal simian immunodeficiency virus (SIVsm) challenge in human immunodeficiency virus type 2-vaccinated cynomolgus monkeys. J Gen Virol 2001; 82:1601-1612. [PMID: 11413371 DOI: 10.1099/0022-1317-82-7-1601] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022] Open
Abstract
In this study we compared the efficacy of live attenuated human immunodeficiency virus type 2 (HIV-2) vaccine alone versus boosting with live non-pathogenic HIV-2 following priming with ALVAC HIV-2 (recombinant canarypox virus expressing HIV-2 env, gag and pol). Six monkeys were first inoculated intravenously with live HIV-2(SBL-6669) and 7 to 10 months later were challenged intrarectally with 10 MID(50) of cell-free simian immunodeficiency virus (SIV) strain SIVsm. One monkey was completely protected against SIV infection and all five monkeys that became SIV-infected showed a lower virus replication and an initial lower virus load as compared with a parallel group of six control animals. In another experiment five monkeys were immunized either three times with ALVAC HIV-2 alone or twice with ALVAC HIV-2 and once with purified native HIV-2 gp125. The monkeys were then challenged with HIV-2 given intravenously and finally with pathogenic SIVsm given intrarectally. After challenge with SIVsm, three of five monkeys were completely protected against SIVsm infection whereas the remaining two macaques became SIV-infected but with limited virus replication. In conclusion, vaccination with an ALVAC HIV-2 vaccine followed by exposure to live HIV-2 could induce cross-protection against mucosal infection with SIVsm and seemed to be more efficient than immunization with a live HIV-2 vaccine only.
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Affiliation(s)
- Lilian Walther-Jallow
- Swedish Institute for Infectious Disease Control and Microbiology and Tumour Biology Centre, Karolinska Institute, SE-17182 Solna, Sweden1
| | - Charlotta Nilsson
- Swedish Institute for Infectious Disease Control and Microbiology and Tumour Biology Centre, Karolinska Institute, SE-17182 Solna, Sweden1
| | - Johan Söderlund
- Immunopathology Laboratory, Karolinska Institute, SE-10401 Stockholm, Sweden2
| | - Peter Ten Haaft
- Department of Virology, Biomedical Primate Research Centre, 2280 GH Rijswijk, The Netherlands3
| | - Barbro Mäkitalo
- Swedish Institute for Infectious Disease Control and Microbiology and Tumour Biology Centre, Karolinska Institute, SE-17182 Solna, Sweden1
| | - Peter Biberfeld
- Immunopathology Laboratory, Karolinska Institute, SE-10401 Stockholm, Sweden2
| | - Per Böttiger
- Swedish Institute for Infectious Disease Control and Microbiology and Tumour Biology Centre, Karolinska Institute, SE-17182 Solna, Sweden1
| | - Jonathan Heeney
- Department of Virology, Biomedical Primate Research Centre, 2280 GH Rijswijk, The Netherlands3
| | - Gunnel Biberfeld
- Swedish Institute for Infectious Disease Control and Microbiology and Tumour Biology Centre, Karolinska Institute, SE-17182 Solna, Sweden1
| | - Rigmor Thorstensson
- Swedish Institute for Infectious Disease Control and Microbiology and Tumour Biology Centre, Karolinska Institute, SE-17182 Solna, Sweden1
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Kazanji M, Tartaglia J, Franchini G, de Thoisy B, Talarmin A, Contamin H, Gessain A, de Thé G. Immunogenicity and protective efficacy of recombinant human T-cell leukemia/lymphoma virus type 1 NYVAC and naked DNA vaccine candidates in squirrel monkeys (Saimiri sciureus). J Virol 2001; 75:5939-48. [PMID: 11390595 PMCID: PMC114309 DOI: 10.1128/jvi.75.13.5939-5948.2001] [Citation(s) in RCA: 37] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
We assessed the immunogenicities and efficacies of two highly attenuated vaccinia virus-derived NYVAC vaccine candidates encoding the human T-cell leukemia/lymphoma virus type 1 (HTLV-1) env gene or both the env and gag genes in prime-boost pilot regimens in combination with naked DNA expressing the HTLV-1 envelope. Three inoculations of NYVAC HTLV-1 env at 0, 1, and 3 months followed by a single inoculation of DNA env at 9 months protected against intravenous challenge with HTLV-1-infected cells in one of three immunized squirrel monkeys. Furthermore, humoral and cell-mediated immune responses against HTLV-1 Env could be detected in this protected animal. However, priming the animal with a single dose of env DNA, followed by immunization with the NYVAC HTLV-1 gag and env vaccine at 6, 7, and 8 months, protected all three animals against challenge with HTLV-1-infected cells. With this protocol, antibodies against HTLV-1 Env and cell-mediated responses against Env and Gag could also be detected in the protected animals. Although the relative superiority of a DNA prime-NYVAC boost regimen over addition of the Gag component as an immunogen cannot be assessed directly, our findings nevertheless show that an HTLV-1 vaccine approach is feasible and deserves further study.
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Affiliation(s)
- M Kazanji
- Laboratoire de Rétrovirologie, Institut Pasteur de la Guyane, 23 Av. Pasteur, Cayenne, French Guiana.
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Hirsch VM, Lifson JD. Simian immunodeficiency virus infection of monkeys as a model system for the study of AIDS pathogenesis, treatment, and prevention. ADVANCES IN PHARMACOLOGY (SAN DIEGO, CALIF.) 2001; 49:437-77. [PMID: 11013771 DOI: 10.1016/s1054-3589(00)49034-4] [Citation(s) in RCA: 82] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/02/2023]
Abstract
As presented in this review, there are a number of different models of both natural and experimental infection of monkeys with primate lentiviruses. There are numerous different viruses and multiple different monkey species, making for a potentially large number of different combinations. The fact that each different combination of virus isolate and host macaque species may show different behavior underscores the need to understand the different models and their key features. On the one hand, this diversity of systems underscores the need to provide some standardization of the systems used for certain kinds of studies, such as vaccine evaluations, in order to facilitate the comparison of results obtained in different experiments, but in essentially the same experimental system. On the other hand, the rich diversity of different systems, with different features and behaviors, represents a tremendous resource, among other things allowing the investigator to select the system that best recapitulates particular aspects of human HIV infection for study in a relevant nonhuman primate model. Such studies have provided, and may be expected to continue to provide, important insights to guide HIV treatment and vaccine development in the future.
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Affiliation(s)
- V M Hirsch
- Laboratory of Molecular Microbiology, National Institute of Allergy and Infectious Diseases (NIAID), National Institutes of Health, Rockville, Maryland 20852, USA
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30
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Ignatius R, Marovich M, Mehlhop E, Villamide L, Mahnke K, Cox WI, Isdell F, Frankel SS, Mascola JR, Steinman RM, Pope M. Canarypox virus-induced maturation of dendritic cells is mediated by apoptotic cell death and tumor necrosis factor alpha secretion. J Virol 2000; 74:11329-38. [PMID: 11070033 PMCID: PMC113238 DOI: 10.1128/jvi.74.23.11329-11338.2000] [Citation(s) in RCA: 93] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
Recombinant avipox viruses are being widely evaluated as vaccines. To address how these viruses, which replicate poorly in mammalian cells, might be immunogenic, we studied how canarypox virus (ALVAC) interacts with primate antigen-presenting dendritic cells (DCs). When human and rhesus macaque monocyte-derived DCs were exposed to recombinant ALVAC, immature DCs were most susceptible to infection. However, many of the infected cells underwent apoptotic cell death, and dying infected cells were engulfed by uninfected DCs. Furthermore, a subset of DCs matured in the ALVAC-exposed DC cultures. DC maturation coincided with tumor necrosis factor alpha (TNF-alpha) secretion and was significantly blocked in the presence of anti-TNF-alpha antibodies. Interestingly, inhibition of apoptosis with a caspase 3 inhibitor also reduced some of the maturation induced by exposure to ALVAC. This indicates that both TNF-alpha and the presence of primarily apoptotic cells contributed to DC maturation. Therefore, infection of immature primate DCs with ALVAC results in apoptotic death of infected cells, which can be internalized by noninfected DCs driving DC maturation in the presence of the TNF-alpha secreted concomitantly by exposed cells. This suggests an important mechanism that may influence the immunogenicity of avipox virus vectors.
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Affiliation(s)
- R Ignatius
- Laboratory of Cellular Physiology and Immunology, The Rockefeller University, New York, New York 10021, USA
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31
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Patterson LJ, Peng B, Abimiku AG, Aldrich K, Murty L, Markham PD, Kalyanaraman VS, Alvord WG, Tartaglia J, Franchini G, Robert-Guroff M. Cross-protection in NYVAC-HIV-1-immunized/HIV-2-challenged but not in NYVAC-HIV-2-immunized/SHIV-challenged rhesus macaques. AIDS 2000; 14:2445-55. [PMID: 11101054 DOI: 10.1097/00002030-200011100-00005] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
Abstract
OBJECTIVES Immunization with attenuated poxvirus-HIV-1 recombinants followed by protein boosting had protected four of eight rhesus macaques from HIV-2SBL6669 challenge. The present study was designed to confirm this result and to conduct the reciprocal cross-protection experiment. METHODS Twenty-four macaques were primed with NYVAC (a genetically attenuated Copenhagen vaccinia strain) recombinants with HIV-1 and HIV-2 env and gag-pol or NYVAC vector alone and boosted with homologous, oligomeric gp160 proteins or adjuvant only. Binding and neutralizing antibodies, cytotoxic T-lymphocytes (CTL) and CD8 T cell antiviral activity (CD8AA) were evaluated. One half of each immunization and control group were intravenously challenged with SHIV(HXB2) the other half was challenged with HIV-2SBL6669,. Protective outcome was assessed by monitoring virus isolation, proviral DNA and plasma viral RNA. RESULTS Both immunization groups developed homologous binding antibodies; however, homologous neutralizing antibodies were only observed in NYVAC-HIV-2-immunized macaques. While no cross-reactive neutralizing antibodies were detected, both immunization groups displayed cross-reactive CTL. Significant CD8AA was observed for only one NYVAC-HIV-2-immunized macaque. Virological assessments verified that both NYVAC-HIV-1 and NYVAC-HIV-2 immunization significantly reduced viral burdens and partially protected against HIV-2 challenge, although cross-protection was not at the level that had been previously reported. Humoral antibody and/or CTL and CD8AA were associated with protection against homologous HIV-2 challenge, while cellular immune responses seemed more important for cross-protection. No significant protection was observed in the SHIV-challenged macaques, although NYVAC-HIV-1 immunization resulted in significantly lower viral burdens compared with controls. CONCLUSIONS Further delineation of cross-reactive mechanisms may aid in the development of a broadly protective vaccine.
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Affiliation(s)
- L J Patterson
- Basic Research Laboratory, National Cancer Institute, Bethesda, Maryland 20892-5055, USA
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32
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Hel Z, Venzon D, Poudyal M, Tsai WP, Giuliani L, Woodward R, Chougnet C, Shearer G, Altman JD, Watkins D, Bischofberger N, Abimiku A, Markham P, Tartaglia J, Franchini G. Viremia control following antiretroviral treatment and therapeutic immunization during primary SIV251 infection of macaques. Nat Med 2000; 6:1140-6. [PMID: 11017146 DOI: 10.1038/80481] [Citation(s) in RCA: 144] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/02/2023]
Abstract
Prolonged antiretroviral therapy (ART) is not likely to eradicate human immunodeficiency virus type I (HIV-I) infection. Here we explore the effect of therapeutic immunization in the context of ART during primary infection using the simian immunodeficiency virus (SIV251) macaque model. Vaccination of rhesus macaques with the highly attenuated poxvirus-based NYVAC-SIV vaccine expressing structural genes elicited vigorous virus-specific CD4 + and CD8+ T cell responses in macaques that responded effectively to ART. Following discontinuation of a six-month ART regimen, viral rebound occurred in most animals, but was transient in six of eight vaccinated animals. Viral rebound was also transient in four of seven mock-vaccinated control animals. These data establish the importance of antiretroviral treatment during primary infection and demonstrate that virus-specific immune responses in the infected host can be expanded by therapeutic immunization.
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Affiliation(s)
- Z Hel
- National Cancer Institute, Basic Research Laboratory, 41/D804, Bethesda, Maryland 20892, USA
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33
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Seth A, Ourmanov I, Schmitz JE, Kuroda MJ, Lifton MA, Nickerson CE, Wyatt L, Carroll M, Moss B, Venzon D, Letvin NL, Hirsch VM. Immunization with a modified vaccinia virus expressing simian immunodeficiency virus (SIV) Gag-Pol primes for an anamnestic Gag-specific cytotoxic T-lymphocyte response and is associated with reduction of viremia after SIV challenge. J Virol 2000; 74:2502-9. [PMID: 10684264 PMCID: PMC111738 DOI: 10.1128/jvi.74.6.2502-2509.2000] [Citation(s) in RCA: 127] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/16/1999] [Accepted: 12/08/1999] [Indexed: 11/20/2022] Open
Abstract
The immunogenicity and protective efficacy of a modified vaccinia virus Ankara (MVA) recombinant expressing the simian immunodeficiency virus (SIV) Gag-Pol proteins (MVA-gag-pol) was explored in rhesus monkeys expressing the major histocompatibility complex (MHC) class I allele, MamuA*01. Macaques received four sequential intramuscular immunizations with the MVA-gag-pol recombinant virus or nonrecombinant MVA as a control. Gag-specific cytotoxic T-lymphocyte (CTL) responses were detected in all MVA-gag-pol-immunized macaques by both functional assays and flow cytometric analyses of CD8(+) T cells that bound a specific MHC complex class I-peptide tetramer, with levels peaking after the second immunization. Following challenge with uncloned SIVsmE660, all macaques became infected; however, viral load set points were lower in MVA-gag-pol-immunized macaques than in the MVA-immunized control macaques. MVA-gag-pol-immunized macaques exhibited a rapid and substantial anamnestic CTL response specific for the p11C, C-M Gag epitope. The level at which CTL stabilized after resolution of primary viremia correlated inversely with plasma viral load set point (P = 0.03). Most importantly, the magnitude of reduction in viremia in the vaccinees was predicted by the magnitude of the vaccine-elicited CTL response prior to SIV challenge.
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Affiliation(s)
- A Seth
- Division of Viral Pathogenesis, Beth Israel Deaconess Medical Center, Harvard Medical School, Boston, Massachusetts 02115, USA
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34
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Shata MT, Stevceva L, Agwale S, Lewis GK, Hone DM. Recent advances with recombinant bacterial vaccine vectors. MOLECULAR MEDICINE TODAY 2000; 6:66-71. [PMID: 10652479 DOI: 10.1016/s1357-4310(99)01633-0] [Citation(s) in RCA: 83] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
Abstract
Bacille Calmette-Guerin (BCG), Listeria monocytogenes, Salmonellae and Shigellae have shown promise as vaccine vectors in experimental animal models. Although disappointing results in humans and non-human primates stalled the development of this vaccination strategy, interest in this approach was reinvigorated recently by the development of bacterial DNA-vaccine-vectors. The purpose of this review is to highlight the strengths and weaknesses of bacterial vaccine vectors, and to discuss the future prospects of these vaccine delivery systems.
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Affiliation(s)
- M T Shata
- Division of Vaccine Research, Institute of Human Virology, 725 Lombard Street, Baltimore, MD 21201, USA
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35
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Abstract
The technologies of recombinant gene expression have greatly enhanced the structural and functional analyses of genetic elements and proteins. Vaccinia virus, a large double-stranded DNA virus and the prototypic and best characterized member of the poxvirus family, has been an instrumental tool among these technologies and the recombinant vaccinia virus system has been widely employed to express genes from eukaryotic, prokaryotic, and viral origins. Vaccinia virus is also the prototype live viral vaccine and serves as the basis for well established viral vectors which have been successfully evaluated as human and animal vaccines for infectious diseases and as anticancer vaccines in a variety of animal model systems. Vaccinia virus technology has also been instrumental in a number of unique applications, from the discovery of new viral receptors to the synthesis and assembly of other viruses in culture. Here we provide a simple and detailed outline of the processes involved in the generation of a typical recombinant vaccinia virus, along with an up to date review of relevant literature.
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Affiliation(s)
- C C Broder
- Department of Microbiology and Immunology, Uniformed Services University of the Health Sciences, Bethesda, Maryland 20814, USA
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36
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Leno M, Carter L, Venzon DJ, Romano J, Markham PD, Limbach K, Tartaglia J, Paoletti E, Benson J, Franchini G, Robert-Guroff M. CD8+ lymphocyte antiviral activity in monkeys immunized with SIV recombinant poxvirus vaccines: potential role in vaccine efficacy. AIDS Res Hum Retroviruses 1999; 15:461-70. [PMID: 10195756 DOI: 10.1089/088922299311213] [Citation(s) in RCA: 23] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022] Open
Abstract
Protection against intravenous simian immunodeficiency virus (SIV) challenge was assessed in rhesus macaques after immunization with a highly attenuated vaccinia (NYVAC)-SIV recombinant. One-third of vaccinated animals controlled viral infection and progressed to disease more slowly than control animals (Benson J, et al.: J Virol 1998;72:4170). However, this protection was not associated with neutralizing antibodies, cytotoxic T lymphocytes, or helper T cell responses. To explore other potential correlates of protection, we examined CD8+ T cell antiviral activity in macaques vaccinated with NYVAC-SIV, with or without added cytokine adjuvants, and in controls receiving only IL-12 or IL-12 plus IL-2. Before immunization, naive macaques exhibited a broad range of CD8+ T cell antiviral activity. Nevertheless, in the course of immunization, the vaccinated macaques as a group developed increased CD8+ T cell antiviral activity while the controls remained stable. Infectious SIV exposure also increased antiviral activity. Prechallenge antiviral activity levels of vaccinated macaques were not sufficient to prevent SIV transmission or control viral replication during acute infection. However, vaccinated animals consistently exhibited reduced viral loads postchallenge compared with controls. Moreover, high suppressive activity 8 weeks postchallenge, at which time the viremia set point was established, was significantly correlated with reduced viral load and slow disease progression. Prechallenge antiviral activity influenced this result, as decreased viremia and slow progressor status were more apparent in macaques with high suppressive activity both pre- and postchallenge. Our data demonstrate the impact of CD8+ antiviral activity on viral replication and disease progression, and suggest that vaccine designs able to elicit high levels of this activity will contribute significantly to protective efficacy.
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Affiliation(s)
- M Leno
- Basic Research Laboratory, National Cancer Institute, Bethesda, Maryland 20892-4255, USA
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37
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Steger KK, Valentine PJ, Heffron F, So M, Pauza CD. Recombinant, attenuated Salmonella typhimurium stimulate lymphoproliferative responses to SIV capsid antigen in rhesus macaques. Vaccine 1999; 17:923-32. [PMID: 10067699 DOI: 10.1016/s0264-410x(98)00278-3] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
Abstract
Recombinant bacteria are useful vectors for delivering foreign antigens to mucosal surfaces and may elicit immune protection against sexually-transmitted pathogens. Recombinant, attenuated Salmonella typhimurium expressing the Simian Immunodeficiency Virus capsid protein (p27) were given to rhesus macaques by intragastric intubation. This route of immunization was compared with intramuscular injection of soluble p27 in adjuvant, and with immunization protocols that combined intragastric and intramuscular antigen exposures. Recombinant Salmonella stimulated p27-specific lymphoproliferative responses that were present transiently in peripheral blood, and were recalled easily by booster immunizations. Intramuscular p27 injection elicited strong serum antibody responses, but only low level capsid-specific proliferative responses. Recombinant Salmonella immunization elicited low levels of p27-specific antibodies in serum and did not suppress subsequent responses to parenteral immunization. Intragastric immunization of macaques with recombinant Salmonella typhimurium was safe and induced immune responses specific for the expressed, foreign antigen.
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MESH Headings
- Animals
- Antibodies, Bacterial/biosynthesis
- Antibodies, Bacterial/blood
- Antibody Specificity
- Bacterial Vaccines/genetics
- Bacterial Vaccines/immunology
- Bacterial Vaccines/pharmacology
- Epitopes/immunology
- Female
- Gene Products, gag/immunology
- Immunoglobulin G/biosynthesis
- Immunoglobulin G/blood
- Lymphocyte Activation/immunology
- Macaca mulatta
- Male
- Salmonella Infections, Animal/blood
- Salmonella Infections, Animal/immunology
- Salmonella typhimurium/genetics
- Salmonella typhimurium/immunology
- Simian Immunodeficiency Virus/immunology
- Vaccines, Attenuated/genetics
- Vaccines, Attenuated/immunology
- Vaccines, Attenuated/pharmacology
- Vaccines, Synthetic/genetics
- Vaccines, Synthetic/immunology
- Vaccines, Synthetic/pharmacology
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Affiliation(s)
- K K Steger
- Department of Pathology and Laboratory Medicine, University of Wisconsin Medical School, Madison, USA
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38
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Benson J, Chougnet C, Robert-Guroff M, Montefiori D, Markham P, Shearer G, Gallo RC, Cranage M, Paoletti E, Limbach K, Venzon D, Tartaglia J, Franchini G. Recombinant vaccine-induced protection against the highly pathogenic simian immunodeficiency virus SIV(mac251): dependence on route of challenge exposure. J Virol 1998; 72:4170-82. [PMID: 9557706 PMCID: PMC109646 DOI: 10.1128/jvi.72.5.4170-4182.1998] [Citation(s) in RCA: 130] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/24/1997] [Accepted: 02/06/1998] [Indexed: 02/07/2023] Open
Abstract
Vaccine protection from infection and/or disease induced by highly pathogenic simian immunodeficiency virus (SIV) strain SIV(mac251) in the rhesus macaque model is a challenging task. Thus far, the only approach that has been reported to protect a fraction of macaques from infection following intravenous challenge with SIV(mac251) was the use of a live attenuated SIV vaccine. In the present study, the gag, pol, and env genes of SIV(K6W) were expressed in the NYVAC vector, a genetically engineered derivative of the vaccinia virus Copenhagen strain that displays a highly attenuated phenotype in humans. In addition, the genes for the alpha and beta chains of interleukin-12 (IL-12), as well as the IL-2 gene, were expressed in separate NYVAC vectors and inoculated intramuscularly, in conjunction with or separate from the NYVAC-SIV vaccine, in 40 macaques. The overall cytotoxic T-lymphocyte (CTL) response was greater, at the expense of proliferative and humoral responses, in animals immunized with NYVAC-SIV and NYVAC-IL-12 than in animals immunized with the NYVAC-SIV vaccine alone. At the end of the immunization regimen, half of the animals were challenged with SIV(mac251) by the intravenous route and the other half were exposed to SIV(mac251) intrarectally. Significantly, five of the eleven vaccinees exposed mucosally to SIV(mac251) showed a transient peak of viremia 1 week after viral challenge and subsequently appeared to clear viral infection. In contrast, all 12 animals inoculated intravenously became infected, but 5 to 6 months after viral challenge, 4 animals were able to control viral expression and appeared to progress to disease more slowly than control animals. Protection did not appear to be associated with any of the measured immunological parameters. Further modulation of immune responses by coadministration of NYVAC-cytokine recombinants did not appear to influence the outcome of viral challenge. The fact that the NYVAC-SIV recombinant vaccine appears to be effective per se in the animal model that best mirrors human AIDS supports the idea that the development of a highly attenuated poxvirus-based vaccine candidate can be a valuable approach to significantly decrease the spread of human immunodeficiency virus (HIV) infection by the mucosal route.
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Affiliation(s)
- J Benson
- Basic Research Laboratory, National Cancer Institute, Bethesda, Maryland 20892, USA
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39
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Tellier MC, Pu R, Pollock D, Vitsky A, Tartaglia J, Paoletti E, Yamamoto JK. Efficacy evaluation of prime-boost protocol: canarypoxvirus-based feline immunodeficiency virus (FIV) vaccine and inactivated FIV-infected cell vaccine against heterologous FIV challenge in cats. AIDS 1998; 12:11-8. [PMID: 9456250 DOI: 10.1097/00002030-199801000-00002] [Citation(s) in RCA: 44] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
Abstract
OBJECTIVE To evaluate the immunogenicity and prophylactic efficacy of immunization schemes employing a recombinant canarypoxvirus ('ALVAC')-based feline immunodeficiency virus (FIV) vaccine alone or in combination with an inactivated FIV-infected cell vaccine against homologous and heterologous FIV challenges in cats. METHODS Specific pathogen-free cats were given a total of three immunizations with subtype A vaccines and challenged 4 weeks after the final immunization with 50 median animal infectious doses (ID50) of FIV-Petaluma, a subtype A isolate. Following the initial challenge, protected cats received a second challenge with 75 ID50 of FIV-Bangston, a subtype B isolate. FIV-specific humoral and cell-mediated responses were measured to determine the immune correlates of protection. RESULTS Two of three cats immunized with the ALVAC FIV recombinants alone were protected from homologous FIV challenge in the presence of FIV-specific cytotoxic T-lymphocyte (CTL) responses but in the absence of FIV-specific humoral responses. All three cats immunized with the ALVAC-FIV recombinant and boosted with FIV-infected cell vaccine were also protected from homologous FIV challenge in the presence of both FIV-specific CTL and humoral responses. Partial to full protection was observed in ALVAC-FIV/FIV-infected cell vaccine-immunized cats against a heterologous FIV challenge given 8 months after the initial challenge. Two out of three cats had transient infection and the remaining cat had no sign of FIV infection at a dose at which all three control cats were readily infected. CONCLUSIONS Immunization schemes employing ALVAC-based FIV vaccines in combination with inactivated FIV-infected cell vaccine generate protective immune responses that can cross-react with FIV isolates that are genetically distinct from the vaccine strains.
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MESH Headings
- Animals
- Antibodies, Viral/analysis
- Antibodies, Viral/immunology
- Avipoxvirus/genetics
- Bone Marrow Cells/virology
- Cats
- Cross Reactions/immunology
- Feline Acquired Immunodeficiency Syndrome/immunology
- Feline Acquired Immunodeficiency Syndrome/prevention & control
- Gene Products, gag/immunology
- Immunodeficiency Virus, Feline/genetics
- Immunodeficiency Virus, Feline/immunology
- Immunodeficiency Virus, Feline/metabolism
- Leukocytes, Mononuclear/virology
- Lymph Nodes/virology
- Neutralization Tests
- Pilot Projects
- Polymerase Chain Reaction
- RNA-Directed DNA Polymerase/metabolism
- Specific Pathogen-Free Organisms
- T-Lymphocytes, Cytotoxic/immunology
- Vaccines, Inactivated/administration & dosage
- Vaccines, Inactivated/immunology
- Vaccines, Synthetic/administration & dosage
- Vaccines, Synthetic/immunology
- Viral Envelope Proteins/immunology
- Viral Vaccines/administration & dosage
- Viral Vaccines/immunology
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Affiliation(s)
- M C Tellier
- Department of Pathobiology, School of Veterinary Medicine, University of Florida, Gainesville, USA
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40
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Shibata R, Siemon C, Czajak SC, Desrosiers RC, Martin MA. Live, attenuated simian immunodeficiency virus vaccines elicit potent resistance against a challenge with a human immunodeficiency virus type 1 chimeric virus. J Virol 1997; 71:8141-8. [PMID: 9343164 PMCID: PMC192270 DOI: 10.1128/jvi.71.11.8141-8148.1997] [Citation(s) in RCA: 97] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/05/2023] Open
Abstract
Three rhesus macaques, previously immunized with SIVdelta3 or SIVdelta2, each an attenuated derivative of SIVmac239, and two naive monkeys were challenged with 30,000 50% tissue culture infective doses of SHIV, an SIV/human immunodeficiency virus type 1 (HIV-1) chimeric virus bearing the dual-tropic envelope of HIV-1DH12. By several criteria, including virus isolation, serological assays, and PCR (both DNA and reverse transcriptase), SHIV levels were reduced to barely detectable levels in the circulating blood of vaccinated animals. The resistant SIV-vaccinated macaques had no preexisting neutralizing antibodies directed against SHIV, nor did they produce neutralizing antibodies at any time over a 14-month observation period following SHIV challenge. Interestingly, SIV sequences, derived from the vaccine, could be amplified from numerous tissue samples collected at the conclusion of the experiment, 60 weeks postchallenge, but SHIV-specific sequences (viz., HIV-1 env) could not. These results demonstrate that live attenuated SIV vaccines provide strong long-term protection even against challenge strains with highly divergent envelope sequences.
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Affiliation(s)
- R Shibata
- Laboratory of Molecular Microbiology, National Institute of Allergy and Infectious Diseases, National Institutes of Health, Bethesda, Maryland 20892, USA
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41
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Wu S, Pascual DW, Lewis GK, Hone DM. Induction of mucosal and systemic responses against human immunodeficiency virus type 1 glycoprotein 120 in mice after oral immunization with a single dose of a Salmonella-HIV vector. AIDS Res Hum Retroviruses 1997; 13:1187-94. [PMID: 9310285 DOI: 10.1089/aid.1997.13.1187] [Citation(s) in RCA: 30] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/05/2023] Open
Abstract
Previous studies from our group showed that a Salmonella-HIV vector vaccine that expressed recombinant HIV-1 envelope protein gp120 stably in the vector cytoplasm elicited type 1 helper T cell (Th1) responses to gp120. Despite the promise of such vaccines, a major limitation in their use was that multiple immunizations were required to elicit even small responses. For this reason, we sought a modified vector configuration that would induce more potent gp120-specific T cell responses exhibiting a broader spectrum of effector functions after a single inoculation. In this article we describe the construction and immunogenicity of a Salmonella-HIV vector that displays a truncated derivative of HIV-1(IIIB) envelope in the periplasm of the vector. A single oral dose of this Salmonella vector, called H683(pW58-asd+), generated a gp120-specific proliferation response in the spleen 14 days after immunization. In agreement with our previous findings, the gp120-specific splenic CD4+ T cells elicited by H683(pW58-asd+) displayed a Th1 phenotype; however, gp120-specific splenic CD4+ Th2 cells were also evident. In addition, this strain induced strong gp120-specific IgA antibody-secreting cell (ASC) responses in the intestinal lamina propria and mesenteric lymph nodes. As many as 2% of the total lamina propria and mesenteric lymph node IgA ASCs were found to be specific for gp120 28 days after a single oral dose of H683(pW57-asd+). Because the proliferative response following a single dose of H683(pW58-asd+) was comparable to that seen previously after three doses of an analogous construct expressing recombinant gp120 in the cytoplasm, these observations suggest that Salmonella-vectored secreted HIV-1 antigens elicit higher T cell responses than their cytoplasmically bound analogs.
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Affiliation(s)
- S Wu
- Division of Infectious Diseases and Gastroenterology, School of Medicine, Johns Hopkins University, Baltimore, Maryland 21202, USA
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Lori F, Gallo RC, Malykh A, Cara A, Romano J, Markham P, Franchini G. Didanosine but not high doses of hydroxyurea rescue pigtail macaque from a lethal dose of SIV(smmpbj14). AIDS Res Hum Retroviruses 1997; 13:1083-8. [PMID: 9282812 DOI: 10.1089/aid.1997.13.1083] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/05/2023] Open
Abstract
It has been previously reported that hydroxyurea (HU) displays anti-HIV-1 activity and potentiates the antiviral effects of didanosine (ddI) in vitro. To assess the antiviral efficacy of HU in an animal model, the effects of HU and ddI, either individually or as combination therapy, were tested in a model using infection of pigtail macaque with the acutely fatal variant SIV(smpbj14). At the high dosage used (100 mg/kg/day), HU monotherapy failed to protect the exposed animals from viral infection and death, which occurred within 10 days postinoculation. However, both of the ddI-treated animals (5 mg/kg/day) survived the SIV(smmpbj14) lethal dose and displayed a reduction in viral load (undetectable SIV RNA or p27gag) in the primary phase of infection. Of the animals treated with the combination of drugs, one died at day 18 after infection and failed to seroconvert to viral antigens. These data suggest that a high dose of HU monotherapy does not protect against death induced by SIV(mmpbj14). However, lower doses of HU as monotherapy or combination therapy deserve further evaluation for their therapeutic effects.
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Affiliation(s)
- F Lori
- Basic Research Laboratory, National Cancer Institute, National Institutes of Health, Bethesda, Maryland 20892, USA
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Abstract
Recombinant viruses have been investigated as candidate vaccines, and have also been used extensively as immunological tools. Recent advances in this area include the following: the construction and testing of a recombinant simian immunodeficiency virus encoding human interferon-gamma; the development of new vectors such as recombinant poliovirus; and the generation of polyepitope vaccines. Basic immunological research has benefited from the use of recombinant viruses to further understand the role of molecules such as CD40 ligand, nitric oxide and interleukin-4.
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Affiliation(s)
- M S Rolph
- Department of Immunology, Max Planck Institute for Infection Biology, Monbijoustrasse 2, D-10117, Berlin, Germany.
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Abstract
Recombinant pox viruses have been generated for vaccination against heterologous pathogens. Amongst these, the following are notable examples. (i) The engineering of the Copenhagen strain of vaccinia virus to express the rabies virus glycoprotein. When applied in baits, this recombinant has been shown to vaccinate the red fox in Europe and raccoons in the United States, stemming the spread of rabies virus infection in the wild. (ii) A fowlpox-based recombinant expressing the Newcastle disease virus fusion and hemagglutinin glycoproteins has been shown to protect commercial broiler chickens for their lifetime when the vaccine was administered at 1 day of age, even in the presence of maternal immunity against either the Newcastle disease virus or the pox vector. (iii) Recombinants of canarypox virus, which is restricted for replication to avian species, have provided protection against rabies virus challenge in cats and dogs, against canine distemper virus, feline leukemia virus, and equine influenza virus disease. In humans, canarypox virus-based recombinants expressing antigens from rabies virus, Japanese encephalitis virus, and HIV have been shown to be safe and immunogenic. (iv) A highly attenuated vaccinia derivative, NYVAC, has been engineered to express antigens from both animal and human pathogens. Safety and immunogenicity of NYVAC-based recombinants expressing the rabies virus glycoprotein, a polyprotein from Japanese encephalitis virus, and seven antigens from Plasmodium falciparum have been demonstrated to be safe and immunogenic in early human vaccine studies.
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Affiliation(s)
- MI Johnston
- The International AIDS Vaccine Initiative, c/o The Rockefeller Foundation, 420 Fifth Avenue, New York, NY 10018-2702, USA
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Myagkikh M, Alipanah S, Markham PD, Tartaglia J, Paoletti E, Gallo RC, Franchini G, Robert-Guroff M. Multiple immunizations with attenuated poxvirus HIV type 2 recombinants and subunit boosts required for protection of rhesus macaques. AIDS Res Hum Retroviruses 1996; 12:985-92. [PMID: 8827214 DOI: 10.1089/aid.1996.12.985] [Citation(s) in RCA: 42] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/02/2023] Open
Abstract
Vaccine protocols involving multiple immunizations with molecularly attenuated vaccinia virus (NYVAC) or naturally attenuated canarypox virus (ALVAC) HIV-2 recombinants and subunit boosts have conferred longlasting protection against HIV-2 infection of macaques. Similar complex protocols using HIV-1 NYVAC and ALVAC recombinants and subunit boosts have provided cross-protection against HIV-2 challenge. Here a simplified three-immunization regimen over 24 weeks was tested in 18 juvenile rhesus macaques. Twelve macaques were immunized twice with NYVAC or ALVAC recombinants carrying HIV-2 env, gag, and pol genes. Subsequently, macaques in groups of three received either an additional recombinant immunization or an HIV-2 gp160 boost. Six control macaques received three immunizations of NYVAC or ALVAC vector alone and additionally alum at the third immunization. Macaques primed with ALVAC recombinant exhibited sporadic T cell proliferative activity, and all but one failed to develop neutralizing antibodies. In contrast, macaques primed with NYVAC recombinants had no T cell proliferative activity but exhibited neutralizing antibody titers (highest in the three recombinant group) that declined by the time of challenge. None of the macaques exhibited significant cytotoxic T lymphocyte activity. Following challenge at 32 weeks with HIV-2SBL6669 all macaques became infected. Thus, the three-immunization regimen is not sufficient to confer protective immunity in the HIV-2 rhesus macaque model. However, delayed infection in macaques immunized with the NYVAC-HIV-2 recombinant may have been associated with the development of memory B cells capable of providing a neutralizing antibody response on challenge.
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Affiliation(s)
- M Myagkikh
- Laboratory of Tumor Cell Biology, DBS, NCI, NIH, Bethesda, Maryland 20892-4255, USA
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Biberfeld G, Thorstensson R, Putkonen P. Protection against human immunodeficiency virus type 2 and simian immunodeficiency virus in macaques vaccinated against human immunodeficiency virus type 2. AIDS Res Hum Retroviruses 1996; 12:443-6. [PMID: 8882330 DOI: 10.1089/aid.1996.12.443] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/02/2023] Open
Affiliation(s)
- G Biberfeld
- Karolinska Institute and Swedish Institute for Infectious Disease Control, Stockholm, Sweden
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Franchini G, Benson J, Gallo R, Paoletti E, Tartaglia J. Attenuated poxvirus vectors as carriers in vaccines against human T cell leukemia-lymphoma virus type I. AIDS Res Hum Retroviruses 1996; 12:407-8. [PMID: 8882320 DOI: 10.1089/aid.1996.12.407] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/02/2023] Open
Affiliation(s)
- G Franchini
- Laboratory of Tumor Cell Biology, National Cancer Institute, Bethesda, Maryland 20892-4255, USA
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