Syndecan-2 selectively regulates VEGF-induced vascular permeability

Area of Science:

• Molecular biology
• Cell biology
• Physiology

Background:

• Vascular endothelial growth factor (VEGF) increases vascular permeability, a key factor in inflammatory and ischemic diseases.
• Specific regulators of VEGF-dependent permeability are not well understood.
• VEGF plays crucial roles in various biological processes beyond vascular permeability.

Purpose of the Study:

• To identify specific regulators of VEGF-driven vascular permeability.
• To investigate the role of proteoglycan Syndecan-2 (Sdc2) in controlling VEGF receptor 2 (VEGFR2) signaling.
• To explore the therapeutic potential of targeting Sdc2 in ischemic injury models.

Main Methods:

• Investigated the interaction between Syndecan-2 (Sdc2), DEP1 phosphatase, and VEGFR2.
• Utilized antibodies to block Sdc2-DEP1 interactions.
• Examined the effect of Sdc2 manipulation on VEGFR2 phosphorylation at the Y951 site.
• Assessed stroke size and intracerebral edema in an in vivo stroke model with endothelial-specific Sdc2 deletion or anti-Sdc2 antibody treatment.

Main Results:

• Syndecan-2 (Sdc2) regulates the cell surface interaction between DEP1 and VEGFR2.
• Absence of Sdc2 or blockade of Sdc2-DEP1 interaction leads to increased DEP1 at the plasma membrane.
• Increased DEP1 promotes selective dephosphorylation of VEGFR2 at the Y951 site, crucial for permeability.
• Endothelial-specific Sdc2 deletion or anti-Sdc2 antibody treatment significantly reduced stroke size and intracerebral edema.

Conclusions:

• Syndecan-2 (Sdc2) acts as a specific regulator of VEGF-driven vascular permeability.
• Targeting the Sdc2-DEP1 interaction offers a potential therapeutic strategy for reducing edema in ischemic stroke.
• Modulating Sdc2 levels or function can selectively impact VEGF-mediated permeability without affecting other VEGFR2 functions.