Dengue Virus NS1 Binds Ephrin B1 to Trigger Endothelial Dysfunction

Area of Science:

• Virology
• Cell Biology
• Immunology

Background:

• Dengue virus (DENV) is a significant mosquito-borne pathogen.
• DENV non-structural protein 1 (NS1) induces vascular leak by affecting endothelial cells.
• The host factors mediating NS1-induced endothelial dysfunction are not fully understood.

Purpose of the Study:

• To investigate the host interactome of DENV NS1 in endothelial cells.
• To identify host factors critical for NS1-mediated endothelial barrier dysfunction.
• To explore potential therapeutic strategies targeting the NS1-host interaction.

Main Methods:

• Comparative mass spectrometry to identify host interactors of DENV NS1.
• Biochemical and computational approaches to map the EFNB1-NS1 complex interface.
• In vitro and in vivo assays using EFNB1-Fc fusion proteins as decoys.

Main Results:

• Ephrin B1 (EFNB1) was identified as a critical host factor in NS1-induced endothelial barrier dysfunction.
• Phosphorylation of EFNB1 is essential for NS1-mediated barrier dysfunction.
• EFNB1-Fc fusion proteins effectively blocked NS1-induced vascular leak in vitro and in vivo.

Conclusions:

• EFNB1 is a key host factor mediating DENV NS1-induced endothelial barrier dysfunction.
• Targeting the EFNB1-NS1 interaction with decoy proteins offers a potential therapeutic strategy against dengue.
• This study elucidates a mechanism of flavivirus-induced vascular leak and suggests novel therapeutic avenues.