Dengue virus infection induces interferon-lambda1 to facilitate cell migration.

Area of Science:

• Immunology
• Virology
• Cell Biology

Background:

• Dengue virus (DENV) outbreaks cause significant mortality, with pathogenic mechanisms poorly understood.
• Cytokines play a critical role in the immune response to DENV infection.
• The immunologic role of the newly identified Interferon-lambda (IFN-λ) subtype in DENV infection remains uninvestigated.

Purpose of the Study:

• To investigate the induction and effects of IFN-λ in DENV-infected human cells.
• To elucidate the signaling pathways involved in DENV-induced IFN-λ production.
• To determine the role of IFN-λ in the immunopathogenesis of DENV infection.

Main Methods:

• DENV infection of human dendritic cells (DCs) and lung epithelial cells.
• Analysis of IFN-λ1 production and its dependence on viral NS1 protein.
• Investigation of signaling pathways including TLR-3, IRF-3, and NF-κB.
• Use of siRNA interference to block IFN-λ1-IFN-λR1 interaction.
• Assessment of DC migration and CCR7 expression.

Main Results:

• DENV infection preferentially induced IFN-λ1 production in human DCs and lung epithelial cells.
• Viral NS1 glycoprotein was responsible for DENV-induced IFN-λ1 production.
• IFN-λ1 induction depended on TLR-3, IRF-3, and NF-κB signaling pathways.
• Blocking IFN-λ1 signaling reduced DENV-induced DC migration by inhibiting CCR7 expression.
• IFN-λ1 itself promoted CCR7 expression and DC migration.

Conclusions:

• This study provides the first evidence for IFN-λ1 induction mechanisms in DENV-infected DCs.
• IFN-λ1 plays a significant role in regulating DC migration and CCR7 expression during DENV infection.
• IFN-λ1 contributes to the immunopathogenesis of DENV infection.