Neurovascular Interaction Promotes the Morphological and Functional Maturation of Cortical Neurons

Area of Science:

• Neuroscience
• Cell Biology
• Developmental Biology

Background:

• Brain microvascular endothelial cells (BMEC) influence neural cell migration, survival, and differentiation.
• The role of BMEC in promoting the development and maturation of immature neurons remains largely unexplored.

Purpose of the Study:

• To investigate the effects of endothelial cells on the morphological and functional development of immature neurons.
• To elucidate the underlying molecular mechanisms of neurovascular interactions in neuronal maturation.

Main Methods:

• Direct endothelium-neuron co-culture system.
• Patch clamp recordings for electrophysiological analysis.
• Confocal imaging for morphological analysis.
• Pharmacological inhibition of VEGF receptor (SU1498) and p38 MAPK (SB203580).

Main Results:

• Co-culture with BMEC or BMEC-conditioned medium (B-CM) promoted neurite outgrowth and spine formation.
• Electrophysiological development and synapse function were accelerated and enhanced by B-CM.
• B-CM induced vascular endothelial growth factor (VEGF) expression and p38 phosphorylation in neurons.
• Inhibition of VEGF receptor or p38 MAPK abolished B-CM-induced effects on neuronal maturation and synaptic function.

Conclusions:

• Endothelium-neuron interactions significantly promote the morphological and functional maturation of neurons.
• Neurovascular interaction-mediated neuronal network maturation is dependent on the activation of the VEGF/Flk-1/p38 MAPK signaling pathway.
• This study reveals novel insights into endothelium-neuron interactions and the mechanisms of neurovascular crosstalk.