Abstract
Antibodies and cytotoxic T cells represent 2 arms of host defense against pathogens. We hypothesized that vaccines that induce both high-magnitude CD8+ T cell responses and antibody responses might confer enhanced protection against HIV. To test this hypothesis, we immunized 3 groups of nonhuman primates: (a) Group 1, which includes sequential immunization regimen involving heterologous viral vectors (HVVs) comprising vesicular stomatitis virus, vaccinia virus, and adenovirus serotype 5-expressing SIVmac239 Gag; (b) Group 2, which includes immunization with a clade C HIV-1 envelope (Env) gp140 protein adjuvanted with nanoparticles containing a TLR7/8 agonist (3M-052); and (c) Group 3, which includes a combination of both regimens. Immunization with HVVs induced very high-magnitude Gag-specific CD8+ T cell responses in blood and tissue-resident CD8+ memory T cells in vaginal mucosa. Immunization with 3M-052 adjuvanted Env protein induced robust and persistent antibody responses and long-lasting innate responses. Despite similar antibody titers in Groups 2 and 3, there was enhanced protection in the younger animals in Group 3, against intravaginal infection with a heterologous SHIV strain. This protection correlated with the magnitude of the serum and vaginal Env-specific antibody titers on the day of challenge. Thus, vaccination strategies that induce both CD8+ T cell and antibody responses can confer enhanced protection against infection.
Keywords:
AIDS vaccine; AIDS/HIV; Adaptive immunity; Vaccines.
Publication types
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Research Support, N.I.H., Extramural
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Research Support, Non-U.S. Gov't
MeSH terms
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AIDS Vaccines / administration & dosage
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AIDS Vaccines / immunology*
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Adjuvants, Immunologic / administration & dosage
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Animals
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Antibodies, Neutralizing / immunology
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Antibodies, Viral / immunology*
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CD8-Positive T-Lymphocytes / immunology
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Disease Models, Animal
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Female
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Genetic Vectors / administration & dosage
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Genetic Vectors / immunology
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HIV Infections / blood
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HIV Infections / immunology
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HIV Infections / prevention & control*
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HIV Infections / virology
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HIV-1 / immunology
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Heterocyclic Compounds, 3-Ring / administration & dosage
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Heterocyclic Compounds, 3-Ring / immunology
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Immunogenicity, Vaccine
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Macaca mulatta
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Mucous Membrane / immunology
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Mucous Membrane / virology
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Simian Acquired Immunodeficiency Syndrome / blood
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Simian Acquired Immunodeficiency Syndrome / immunology
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Simian Acquired Immunodeficiency Syndrome / prevention & control*
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Simian Acquired Immunodeficiency Syndrome / virology
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Simian Immunodeficiency Virus / immunology
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Stearic Acids / administration & dosage
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Stearic Acids / immunology
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Treatment Outcome
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Vaccination / methods
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Vaccines, Synthetic / administration & dosage
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Vaccines, Synthetic / immunology
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Vagina / immunology
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Vagina / virology
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env Gene Products, Human Immunodeficiency Virus / administration & dosage
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env Gene Products, Human Immunodeficiency Virus / genetics
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env Gene Products, Human Immunodeficiency Virus / immunology*
Substances
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AIDS Vaccines
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Adjuvants, Immunologic
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Antibodies, Neutralizing
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Antibodies, Viral
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Heterocyclic Compounds, 3-Ring
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Stearic Acids
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Vaccines, Synthetic
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env Gene Products, Human Immunodeficiency Virus
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gp140 envelope protein, Human immunodeficiency virus 1
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MEDI9197