Abnormal immune response of CCR5-deficient mice to ocular infection with herpes simplex virus type 1

J Gen Virol. 2006 Mar;87(Pt 3):489-499. doi: 10.1099/vir.0.81339-0.

Abstract

Ocular herpes simplex virus type 1 (HSV-1) infection elicits a strong inflammatory response that is associated with production of the beta chemokines CCL3 and CCL5, which share a common receptor, CCR5. To gain insight into the role of these molecules in ocular immune responses, the corneas of wild-type (WT) and CCR5-deficient (CCR5-/-) mice were infected with HSV-1 and inflammatory parameters were measured. In the absence of CCR5, the early infiltration of neutrophils into the cornea was diminished. Associated with this aberrant leukocyte recruitment, neutrophils in CCR5-/- mice were restricted to the stroma, whereas in WT mice, these cells trafficked to the stroma and epithelial layers of the infected cornea. Virus titres and cytokine/chemokine levels in the infected tissue of these mice were similar for the first 5 days after infection. However, by day 7 post-infection, the CCR5-/- mice showed a significant elevation in the chemokines CCL2, CCL5, CXCL9 and CXCL10 in the trigeminal ganglion and brainstem, as well as a significant increase in virus burden. The increase in chemokine expression was associated with an increase in the infiltration of CD4 and/or CD8 T cells into the trigeminal ganglion and brainstem of CCR5-/- mice. Surprisingly, even though infected CCR5-/- mice were less efficient at controlling the progression of virus replication, there was no difference in mortality. These results suggest that, although CCR5 plays a role in regulating leukocyte trafficking and control of virus burden, compensatory mechanisms are involved in preventing mortality following HSV-1 infection.

Publication types

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

MeSH terms

  • Animals
  • Brain Stem / immunology
  • Brain Stem / virology
  • CD4-Positive T-Lymphocytes / immunology
  • CD8-Positive T-Lymphocytes / immunology
  • Cell Count
  • Cell Movement
  • Chemokines / biosynthesis
  • Chlorocebus aethiops
  • Cornea / immunology
  • Cornea / virology
  • Herpesvirus 1, Human*
  • Keratitis, Herpetic / immunology*
  • Mice
  • Mice, Inbred C57BL
  • Mice, Knockout
  • Neutrophils / physiology
  • Receptors, CCR5 / deficiency
  • Receptors, CCR5 / genetics
  • Trigeminal Ganglion / immunology
  • Trigeminal Ganglion / virology
  • Vero Cells

Substances

  • Chemokines
  • Receptors, CCR5