Angiopoietin-like 4 protects against endothelial dysfunction during bacterial sepsis

Area of Science:

• Vascular Biology
• Infectious Diseases
• Neuroscience

Background:

• Sepsis pathogenesis involves loss of endothelial integrity and vascular leakage, with no current effective therapies.
• Brain microvessels exhibit resistance to Neisseria meningitidis infection, unlike peripheral microvessels.

Purpose of the Study:

• To identify mechanisms preserving endothelial integrity during bacterial sepsis.
• To explore the role of angiopoietin-like 4 in protecting the blood-brain barrier.

Main Methods:

• Comparative transcriptional analysis of dermal and brain endothelial cells in response to infection.
• Administration of recombinant angiopoietin-like 4 in mouse models of sepsis.
• Investigation of angiopoietin-like 4's interaction with syndecan-4.

Main Results:

• Angiopoietin-like 4, produced by brain endothelium, preserves blood-brain barrier integrity during sepsis.
• Peripheral endothelium produces lower levels of angiopoietin-like 4.
• Recombinant angiopoietin-like 4 treatment reduced vascular leakage, organ failure, and mortality in sepsis models.
• A specific domain of angiopoietin-like 4 binds to syndecan-4 to confer protection.

Conclusions:

• Angiopoietin-like 4 is a key factor in maintaining endothelial integrity during sepsis.
• Targeting angiopoietin-like 4 offers a potential therapeutic strategy for sepsis and N. meningitidis infections.
• This finding may lead to improved outcomes for patients suffering from sepsis-induced endothelial dysfunction.