Adaptive and innate transforming growth factor beta signaling impact herpes simplex virus 1 latency and reactivation

J Virol. 2011 Nov;85(21):11448-56. doi: 10.1128/JVI.00678-11. Epub 2011 Aug 31.

Abstract

Innate and adaptive immunity play important protective roles by combating herpes simplex virus 1 (HSV-1) infection. Transforming growth factor β (TGF-β) is a key negative cytokine regulator of both innate and adaptive immune responses. Yet, it is unknown whether TGF-β signaling in either immune compartment impacts HSV-1 replication and latency. We undertook genetic approaches to address these issues by infecting two different dominant negative TGF-β receptor type II transgenic mouse lines. These mice have specific TGF-β signaling blockades in either T cells or innate cells. Mice were ocularly infected with HSV-1 to evaluate the effects of restricted innate or adaptive TGF-β signaling during acute and latent infections. Limiting innate cell but not T cell TGF-β signaling reduced virus replication in the eyes of infected mice. On the other hand, blocking TGF-β signaling in either innate cells or T cells resulted in decreased latency in the trigeminal ganglia of infected mice. Furthermore, inhibiting TGF-β signaling in T cells reduced cell lysis and leukocyte infiltration in corneas and trigeminal ganglia during primary HSV-1 infection of mice. These findings strongly suggest that TGF-β signaling, which generally functions to dampen immune responses, results in increased HSV-1 latency.

Publication types

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

MeSH terms

  • Animals
  • Disease Models, Animal
  • Eye / virology
  • Gene Expression Regulation, Viral*
  • Herpesvirus 1, Human / physiology*
  • Keratitis, Herpetic / immunology
  • Keratitis, Herpetic / virology
  • Mice
  • Mice, Transgenic
  • Rodent Diseases / immunology
  • Rodent Diseases / virology
  • Signal Transduction*
  • Transforming Growth Factor beta / metabolism*
  • Trigeminal Ganglion / immunology
  • Trigeminal Ganglion / virology
  • Virus Activation*
  • Virus Latency*
  • Virus Replication

Substances

  • Transforming Growth Factor beta