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Updated: Oct 18, 2025
Dissecting Innate Immune Signaling in Viral Evasion of Cytokine Production
Published on: March 2, 2014
MEK/ERK MAP kinase limits poly I:C-induced antiviral gene expression in RAW264.7 macrophages by reducing
Shawn M Freed1, Danielle S Baldi1, Jason A Snow1
1Department of Biology, College of Science and Technology, Bellevue University, NE, USA.
Abstract:
Toll-like receptor 3 (TLR3) recognizes viral double-stranded RNA (or the synthetic dsRNA analog poly I:C) and induces a signal transduction pathway that results in activation of transcription factors that induce expression of antiviral genes including type I interferon (IFN-I). Secreted IFN-I positively feeds back to amplify antiviral gene expression. In this report, we study the role of MEK/ERK MAP kinase in modulating antiviral gene expression downstream of TLR3. We find MEK/ERK is a negative regulator of antiviral gene expression by limiting expression of IFN-β. However, MEK/ERK does not limit antiviral responses downstream of the type I interferon receptor. These findings provide insights into regulatory mechanisms of antiviral gene expression and reveal potential targets for modulating antiviral immunity.
Insights
Toll-like receptor 3 (TLR3) activation initiates antiviral gene expression. MEK/ERK signaling acts as a negative regulator, limiting interferon-beta production downstream of TLR3 but not downstream of the type I interferon receptor.
Area of Science:
- Immunology
- Molecular Biology
- Virology
Background:
- Toll-like receptor 3 (TLR3) recognizes viral double-stranded RNA, initiating antiviral responses.
- Type I interferons (IFN-I) are crucial cytokines that amplify antiviral gene expression.
- The precise regulatory mechanisms of TLR3-mediated antiviral gene expression require further elucidation.
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