Vaccine-induced antibodies target sequestered viral antigens to prevent ocular HSV-1 pathogenesis, preserve vision, and preempt productive neuronal infection

Mucosal Immunol. 2019 May;12(3):827-839. doi: 10.1038/s41385-019-0131-y. Epub 2019 Jan 22.

Abstract

The cornea is essential for vision yet highly sensitive to immune-mediated damage following infection. Generating vaccines that provide sterile immunity against ocular surface pathogens without evoking vision loss is therefore clinically challenging. Here, we tested a prophylactic live-attenuated vaccine against herpes simplex virus type 1 (HSV-1), a widespread human pathogen that can cause corneal blindness. Parenteral vaccination of mice resulted in sterile immunity to subsequent HSV-1 challenge in the cornea and suppressed productive infection of the nervous system. This protection was unmatched by a relevant glycoprotein subunit vaccine. Efficacy of the live-attenuated vaccine involved a T-dependent humoral immune response and complement C3 but not Fcγ-receptor 3 or interferon-α/β signaling. Proteomic analysis of viral proteins recognized by antiserum revealed an unexpected repertoire dominated by sequestered antigens rather than surface-exposed envelope glycoproteins. Ocular HSV-1 challenge in naive and subunit-vaccinated mice triggered vision loss and severe ocular pathologies including corneal opacification, scar formation, neovascularization, and sensation loss. However, corneal pathology was absent in mice receiving the live-attenuated vaccine concomitant with complete preservation of visual acuity. Collectively, this is the first comprehensive report of a prophylactic vaccine candidate that elicits resistance to ocular HSV-1 infection while fully preserving the cornea and visual acuity.

Publication types

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

MeSH terms

  • Animals
  • Antibodies, Viral / blood
  • Antigens, Viral / immunology*
  • Complement C3
  • Cornea / pathology*
  • Cornea / virology
  • Eye Diseases / immunology*
  • Eye Diseases / prevention & control
  • Herpes Simplex / immunology*
  • Herpesvirus 1, Human / physiology*
  • Humans
  • Immunity, Humoral
  • Mice
  • Mice, Inbred C57BL
  • Mice, Knockout
  • Neurons / immunology*
  • Neurons / virology
  • T-Lymphocytes / immunology
  • Vaccination
  • Viral Vaccines / immunology*
  • Vision, Ocular

Substances

  • Antibodies, Viral
  • Antigens, Viral
  • Complement C3
  • Viral Vaccines