CD8+ T cells suppress viral replication in the cornea but contribute to VEGF-C-induced lymphatic vessel genesis

J Immunol. 2012 Jul 1;189(1):425-32. doi: 10.4049/jimmunol.1200063. Epub 2012 May 30.

Abstract

HSV-1 is the leading cause of infectious corneal blindness in the industrialized world. CD4(+) T cells are thought to be the major leukocyte population mediating immunity to HSV-1 in the cornea as well as the likely source of immunopathology that reduces visual acuity. However, the role of CD8(+) T cells in immune surveillance of the cornea is unclear. Thus, we sought to evaluate the role of CD8(+) T cells in ocular immunity using transgenic mice in which >98% of CD8(+) T cells are specific for the immunodominant HSV-1 epitope (gBT-I.1). We found a significant reduction in virus, elevation in HSV-specific CD8(+) T cell influx, and more CD8(+) T cells expressing CXCR3 in the cornea of transgenic mice compared with those in the cornea of wild-type controls yet similar acute corneal pathology. However, by day 30 postinfection, wild-type mice had drastically more blood and lymphatic vessel projections into the cornea compared with gBT-I.1 mice, in which only lymphatic vessel growth in response to VEGF-C could be appreciated. Taken together, these results show that CD8(+) T cells are required to eliminate virus more efficiently from the cornea but play a minimal role in immunopathology as a source of VEGF-C.

Publication types

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

MeSH terms

  • Animals
  • CD8-Positive T-Lymphocytes / immunology*
  • CD8-Positive T-Lymphocytes / pathology*
  • CD8-Positive T-Lymphocytes / virology
  • Cell Line
  • Cell Movement / immunology
  • Chlorocebus aethiops
  • Female
  • Herpesvirus 1, Human / immunology*
  • Keratitis, Herpetic / pathology*
  • Keratitis, Herpetic / prevention & control*
  • Keratitis, Herpetic / virology
  • Lymph Nodes / growth & development
  • Lymph Nodes / immunology
  • Lymph Nodes / pathology
  • Lymphangiogenesis / immunology*
  • Male
  • Mice
  • Mice, Inbred C57BL
  • Mice, Knockout
  • Mice, Transgenic
  • Vascular Endothelial Growth Factor C / physiology*
  • Virus Replication / immunology*

Substances

  • Vascular Endothelial Growth Factor C
  • vascular endothelial growth factor C, mouse