Endothelial VEGF sculpts cortical cytoarchitecture

Area of Science:

• Neuroscience
• Developmental Biology
• Vascular Biology

Background:

• Vascular Endothelial Growth Factor (VEGF) is known to regulate angiogenesis and neuronal development.
• Existing models suggest neuronal cells primarily secrete VEGF involved in brain development.

Purpose of the Study:

• To investigate the autonomous role of endothelial cell-derived VEGF in mouse brain development.
• To determine if endothelial VEGF is essential and non-compensable by neuronal VEGF.

Main Methods:

• Selective deletion of the Vegf gene specifically from endothelial cells in mouse models.
• Analysis of brain cytoarchitecture, angiogenesis, neuronal proliferation, differentiation, migration, and axonal tract formation.

Main Results:

• Deletion of endothelial Vegf impaired angiogenesis and caused significant cortical cytoarchitecture perturbations.
• Observed malformations included heterotopias, aberrant cortical lamination, and defective axonal tracts.
• Neuronal proliferation, differentiation, and migration were critically affected in the absence of endothelial VEGF.

Conclusions:

• Endothelial cell-derived VEGF has an autonomous and pivotal role in mouse cerebral cortex development.
• Neuronal VEGF cannot compensate for the loss of endothelial VEGF, highlighting its unique functional significance.
• These findings have implications for understanding brain development and related diseases.