Endothelial PlexinD1 signaling instructs spinal cord vascularization and motor neuron development

Area of Science:

• Neuroscience
• Developmental Biology
• Vascular Biology

Background:

• The intricate cooperation between vascular and neural systems in central nervous system development remains poorly understood.
• Motor neuron (MN) development requires precise coordination with surrounding tissues.

Purpose of the Study:

• To elucidate the communication mechanisms between motor neurons and endothelial cells during spinal cord development.
• To identify key molecular players involved in this crosstalk.

Main Methods:

• Analysis of cell-to-cell interaction profiles in the developing mouse spinal cord.
• Utilizing cell-specific knockout mouse models.
• Performing in vitro assays to validate findings.

Main Results:

• Identified semaphorin 3C (Sema3C) and PlexinD1 as a critical communication axis between MNs and ECs.
• Demonstrated that disruption of the Sema3C-PlexinD1 pathway leads to aberrant vascularization and impaired motor neuron axon exit.
• Showed that impaired PlexinD1 signaling in ECs also affects later-stage MN maturation.

Conclusions:

• Highlights the essential role of timely and spatially regulated MN-EC communication for normal spinal cord development.
• Establishes Sema3C and PlexinD1 as key mediators of this crucial interaction.
• Provides insights into the molecular basis of neurovascular development.