Suppression of angiopoietin-like 4 reprograms endothelial cell metabolism and inhibits angiogenesis

Area of Science:

• Vascular Biology
• Metabolic Regulation
• Endothelial Cell Function

Background:

• Angiopoietin-like 4 (ANGPTL4) influences systemic functions, but its specific role in endothelial cells (ECs) and metabolic homeostasis is unclear.
• Understanding EC-specific ANGPTL4 functions is vital for metabolic and vascular research.

Purpose of the Study:

• To elucidate the cell-specific role of ANGPTL4 in endothelial cell (EC) function and metabolic homeostasis.
• To investigate the impact of ANGPTL4 deletion in ECs on vascular permeability, angiogenesis, and metabolism.

Main Methods:

• Utilized endothelial-specific Angptl4 knock-out mice (Angptl4^iΔEC).
• Employed transcriptomics and metabolic flux analysis to study EC function.
• Assessed vascular permeability, neovascularization, and pericyte coverage in knockout mice.

Main Results:

• Endothelial ANGPTL4 deficiency promotes lipoprotein lipolysis, increasing fatty acid uptake and oxidation in ECs.
• Reduced glucose utilization was observed in ECs with ANGPTL4 knockdown, impacting angiogenic activation.
• Endothelial-specific Angptl4 deletion led to decreased pathological neovascularization and reduced vascular permeability.
• Vessels in knockout mice exhibited enhanced stability with increased pericyte coverage.

Conclusions:

• Endothelial ANGPTL4 is essential for regulating EC metabolic function, which is critical for vascular permeability and angiogenesis.
• Targeting endothelial ANGPTL4 may offer therapeutic strategies for vascular diseases characterized by abnormal neovascularization and permeability.