The herpes simplex virus-1 transactivator infected cell protein-4 drives VEGF-A dependent neovascularization

PLoS Pathog. 2011 Oct;7(10):e1002278. doi: 10.1371/journal.ppat.1002278. Epub 2011 Oct 6.

Abstract

Herpes simplex virus-1 (HSV-1) causes lifelong infection affecting between 50 and 90% of the global population. In addition to causing dermal lesions, HSV-1 is a leading cause of blindness resulting from recurrent corneal infection. Corneal disease is characterized by loss of corneal immunologic privilege and extensive neovascularization driven by vascular endothelial growth factor-A (VEGF-A). In the current study, we identify HSV-1 infected cells as the dominant source of VEGF-A during acute infection, and VEGF-A transcription did not require TLR signaling or MAP kinase activation. Rather than being an innate response to the pathogen, VEGF-A transcription was directly activated by the HSV-1 encoded immediate early transcription factor, ICP4. ICP4 bound the proximal human VEGF-A promoter and was sufficient to promote transcription. Transcriptional activation also required cis GC-box elements common to the VEGF-A promoter and HSV-1 early genes. Our results suggest that the neovascularization characteristic of ocular HSV-1 disease is a direct result of HSV-1's major transcriptional regulator, ICP4, and similarities between the VEGF-A promoter and those of HSV-1 early genes.

Publication types

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

MeSH terms

  • Animals
  • Cell Line
  • Eye / pathology
  • Eye / virology
  • Herpesvirus 1, Human / genetics
  • Herpesvirus 1, Human / metabolism
  • Herpesvirus 1, Human / pathogenicity
  • Humans
  • Immediate-Early Proteins / genetics
  • Immediate-Early Proteins / metabolism*
  • Keratitis, Herpetic / pathology*
  • Keratitis, Herpetic / virology
  • Male
  • Mice
  • Mice, Inbred C57BL
  • Mice, Knockout
  • Microscopy, Fluorescence / methods
  • Neovascularization, Pathologic / genetics
  • Plasmids
  • Promoter Regions, Genetic
  • Real-Time Polymerase Chain Reaction
  • Sequence Analysis, DNA
  • Trans-Activators / genetics
  • Trans-Activators / metabolism*
  • Transcription Factors / genetics
  • Transcription Factors / metabolism
  • Transcriptional Activation
  • Vascular Endothelial Growth Factor A / genetics
  • Vascular Endothelial Growth Factor A / metabolism*

Substances

  • Immediate-Early Proteins
  • Trans-Activators
  • Transcription Factors
  • Vascular Endothelial Growth Factor A
  • herpes simplex virus, type 1 protein ICP4