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Oligodeoxynucleotides inhibit Toll-like receptor 3 mediated cytotoxicity and CXCL8 release in keratinocytes

Oystein Grimstad1, Brita Pukstad, Jørgen Stenvik

  • 1Department of Cancer Research and Molecular Medicine, Norwegian University of Science and Technology, Trondheim, Norway. oystein.grimstad@ntnu.no

Experimental Dermatology
|November 16, 2011
PubMed

Insights

Toll-like receptor 3 (TLR3) activation by polyI:C causes keratinocyte toxicity and inflammation. Oligodeoxynucleotides (ODNs) inhibit these TLR3-mediated effects by blocking cellular uptake, suggesting ODNs as potential therapeutics for skin disorders.

Area of Science:

  • Immunology
  • Dermatology
  • Cell Biology

Background:

  • Toll-like receptor 3 (TLR3) is crucial for detecting viral infections and cellular damage in skin keratinocytes.
  • TLR3 activation can lead to inflammatory responses and cellular toxicity.

Purpose of the Study:

  • To investigate the role of TLR3 in polyI:C-induced keratinocyte responses.
  • To explore the potential of oligodeoxynucleotides (ODNs) in modulating TLR3-mediated effects.

Main Methods:

  • Primary keratinocytes were stimulated with polyI:C, a TLR3 ligand.
  • Cellular toxicity was assessed using MTT assays and high-mobility group protein B1 (HMGB1) expression.
  • TLR3 dependency was confirmed using siRNA.
  • Co-stimulation with ODNs was performed to evaluate inhibitory effects.

Main Results:

  • PolyI:C induced significant keratinocyte toxicity and upregulated HMGB1.
  • PolyI:C strongly induced proinflammatory cytokines in a TLR3-dependent manner.
  • ODNs effectively inhibited polyI:C-induced cytotoxicity and cytokine production.
  • Inhibition by ODNs was attributed to competition for endocytic uptake.

Conclusions:

  • PolyI:C-induced cytotoxicity and inflammation in keratinocytes are TLR3-dependent.
  • ODNs can successfully inhibit TLR3-mediated responses.
  • ODNs show therapeutic potential for managing TLR3-driven inflammatory skin conditions.

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