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Updated: Apr 4, 2026

Limbal Approach-Subretinal Injection of Viral Vectors for Gene Therapy in Mice Retinal Pigment Epithelium
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Limbal Approach-Subretinal Injection of Viral Vectors for Gene Therapy in Mice Retinal Pigment Epithelium

Published on: August 7, 2015

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Gene expression regulation in retinal pigment epithelial cells induced by viral RNA and viral/bacterial DNA

Anton Brosig1, Heidrun Kuhrt2, Peter Wiedemann1

  • 1Department of Ophthalmology and Eye Hospital, University of Leipzig, Leipzig, Germany.

Molecular Vision
|September 3, 2015
PubMed
Abstract

Insights

Viral RNA (poly(I:C)) significantly impacts retinal pigment epithelial (RPE) cells, inducing inflammation and altering gene expression linked to age-related macular degeneration (AMD). Viral/bacterial DNA (CpG-ODN) had minimal effects, suggesting viral RNA is a key driver of RPE cell inflammation.

Area of Science:

  • Ophthalmology
  • Immunology
  • Molecular Biology

Background:

  • Age-related macular degeneration (AMD) pathogenesis involves inflammation.
  • Viral and bacterial infections may exacerbate retinal inflammation in aged individuals.

Purpose of the Study:

  • To compare the effects of synthetic viral RNA (poly(I:C)) and viral/bacterial DNA (CpG-ODN) on gene expression in human retinal pigment epithelial (RPE) cells.
  • To investigate the role of these stimuli in pathways relevant to AMD pathogenesis.

Main Methods:

  • Human RPE cells were stimulated with poly(I:C) or CpG-ODN.
  • Gene expression was analyzed using real-time RT-PCR.
  • Protein secretion was measured by ELISA.
  • Signal transduction pathway activation was assessed by western blotting.

Main Results:

  • Poly(I:C) upregulated pattern recognition receptors (TLR3), transcription factors (HIF-1α, p65/NF-κB), angiogenic factors (bFGF), inflammatory mediators (IL-1β, IL-6, TNFα, MCP-1, MIP-2), and complement factors (C5, C9, CFB).
  • Poly(I:C) also induced ERK1/2 and p38 MAPK phosphorylation and secretion of bFGF and TNFα.
  • CpG-ODN induced moderate expression of transcription factors and complement factors but had no significant effect on TLR, angiogenic, or inflammatory genes.

Conclusions:

  • Viral RNA (poly(I:C)) induces widespread changes in RPE cell gene expression, potentially aggravating retinal inflammation in AMD.
  • Viral/bacterial DNA (CpG-ODN) has more restricted effects on RPE cells.
  • Targeting individual pathways may be insufficient to inhibit viral-induced retinal inflammation.

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