Vaccine induction of antibodies and tissue-resident CD8+ T cells enhances protection against mucosal SHIV-infection in young macaques

JCI Insight. 2019 Feb 21;4(4):e126047. doi: 10.1172/jci.insight.126047.

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

  • Research Support, N.I.H., Extramural
  • Research Support, Non-U.S. Gov't

MeSH terms

  • AIDS Vaccines / administration & dosage
  • AIDS Vaccines / immunology*
  • Adjuvants, Immunologic / administration & dosage
  • Animals
  • Antibodies, Neutralizing / immunology
  • Antibodies, Viral / immunology*
  • CD8-Positive T-Lymphocytes / immunology
  • Disease Models, Animal
  • Female
  • Genetic Vectors / administration & dosage
  • Genetic Vectors / immunology
  • HIV Infections / blood
  • HIV Infections / immunology
  • HIV Infections / prevention & control*
  • HIV Infections / virology
  • HIV-1 / immunology
  • Heterocyclic Compounds, 3-Ring / administration & dosage
  • Heterocyclic Compounds, 3-Ring / immunology
  • Immunogenicity, Vaccine
  • Macaca mulatta
  • Mucous Membrane / immunology
  • Mucous Membrane / virology
  • Simian Acquired Immunodeficiency Syndrome / blood
  • Simian Acquired Immunodeficiency Syndrome / immunology
  • Simian Acquired Immunodeficiency Syndrome / prevention & control*
  • Simian Acquired Immunodeficiency Syndrome / virology
  • Simian Immunodeficiency Virus / immunology
  • Stearic Acids / administration & dosage
  • Stearic Acids / immunology
  • Treatment Outcome
  • Vaccination / methods
  • Vaccines, Synthetic / administration & dosage
  • Vaccines, Synthetic / immunology
  • Vagina / immunology
  • Vagina / virology
  • env Gene Products, Human Immunodeficiency Virus / administration & dosage
  • env Gene Products, Human Immunodeficiency Virus / genetics
  • env Gene Products, Human Immunodeficiency Virus / immunology*

Substances

  • AIDS Vaccines
  • Adjuvants, Immunologic
  • Antibodies, Neutralizing
  • Antibodies, Viral
  • Heterocyclic Compounds, 3-Ring
  • Stearic Acids
  • Vaccines, Synthetic
  • env Gene Products, Human Immunodeficiency Virus
  • gp140 envelope protein, Human immunodeficiency virus 1
  • MEDI9197