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TLR4/CD14-mediated PI3K activation is an essential component of interferon-dependent VSV resistance in macrophages

Gernot Schabbauer1, James Luyendyk, Karine Crozat

  • 1Department for Vascular Biology, Center for Biomolecular Medicine and Pharmacology, Medical University Vienna, Schwarzspanierstrasse 17, Vienna, Austria.

Molecular Immunology
|March 15, 2008
PubMed

Insights

Phosphatidylinositol-3-phosphate kinase (PI3K) is crucial for antiviral defense by modulating Toll-like receptor 4 (TLR4) signaling. Inhibiting PI3K increases susceptibility to viral infections, highlighting its role in interferon production.

Area of Science:

  • Immunology
  • Molecular Biology
  • Virology

Background:

  • Phosphatidylinositol-3-phosphate kinase (PI3K) negatively regulates NF-kappaB signaling in response to Toll-like receptor 4 (TLR4) activation.
  • The role of PI3K in TLR4-dependent, MyD88-independent antiviral signaling remains largely unexplored.

Purpose of the Study:

  • To investigate the function of PI3K in the MyD88-independent TLR4 signaling pathway activated by Vesicular Stomatitis Virus (VSV).
  • To determine the impact of PI3K modulation on antiviral defense and type I interferon production.

Main Methods:

  • Macrophage infection with VSV.
  • Assessment of TLR4 and CD14-dependent Akt phosphorylation.
  • Pharmacological inhibition and genetic modification of the PI3K pathway.
  • Evaluation of viral susceptibility and type I interferon synthesis.

Main Results:

  • VSV infection induced TLR4- and CD14-dependent Akt phosphorylation, indicating PI3K pathway activation.
  • Pharmacological inactivation of PI3K led to hypersusceptibility to viral infections.
  • Constitutively active PI3K pathway enhanced resistance to viral infections.
  • The PI3K-Akt axis is essential for type I interferon production and antiviral resistance.

Conclusions:

  • The PI3K-Akt axis is a critical component of the TLR4-dependent antiviral response.
  • Targeting PI3K for anti-inflammatory purposes may inadvertently increase susceptibility to viral infections.

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