Endothelial cell-derived GABA signaling modulates neuronal migration and postnatal behavior.

Area of Science:

• Neuroscience
• Developmental Biology
• Vascular Biology

Background:

• The cerebral cortex's laminar organization is crucial for behavior.
• Radial glia guide projection neurons, while vasculature aids interneuron migration.
• Vascular-neuronal interactions in cortical development are not fully understood.

Purpose of the Study:

• To investigate novel mechanisms of GABA signaling in embryonic endothelial cells.
• To elucidate the role of endothelial GABA in interneuron migration and cortical development.
• To explore the implications of endothelial GABA signaling in neuropsychiatric disorders.

Main Methods:

• Utilized two novel endothelial cell-specific conditional mouse models (Gabrb3ΔTie2-Cre and VgatΔTie2-Cre).
• Analyzed vascular defects, interneuron migration, and positioning in knockout models.
• Investigated endothelial cell activation mechanisms and downstream effects on cortical circuits.

Main Results:

• Loss of endothelial GABA release during embryogenesis caused vascular defects and impaired interneuron migration/positioning.
• Perturbed endothelial GABA signaling led to lasting changes in cortical circuits and persistent behavioral deficits.
• Identified novel mechanisms of GABA signaling activation in endothelial cells promoting migration and BBB properties.

Conclusions:

• Discovered a novel, distinct endothelial GABA signaling pathway in the CNS.
• This pathway is critical for proper cortical development and interneuron positioning.
• Findings offer new insights into the pathophysiology of neuropsychiatric disorders like autism and epilepsy.