Generation of highly enriched V2a interneurons from mouse embryonic stem cells

Area of Science:

• Neuroscience
• Developmental Biology
• Stem Cell Biology

Background:

• Spinal microcircuit architecture is complex and challenging to model.
• Spinal interneurons (INs) are vital for motor control but difficult to isolate.
• Understanding INs is key for functional regeneration after spinal cord injury.

Purpose of the Study:

• To develop a method for obtaining highly enriched populations of V2a interneurons from mouse embryonic stem cells.
• To characterize the purity, maturation, and functional properties of these derived V2a INs.
• To establish a tool for studying V2a INs in isolation or in vitro spinal cord models.

Main Methods:

• Utilized a transgenic mouse embryonic stem cell (ESC) line expressing puromycin N-acetyltransferase under the control of Chx10 regulatory elements.
• Applied positive selection with puromycin to isolate V2a INs.
• Assessed cell purity, maturation (molecular markers, electrophysiology), and functional synaptic connections in co-cultures with motor neurons.

Main Results:

• Achieved highly enriched populations of V2a INs (approx. 80% Chx10(+), 94% Lhx3(+)) directly after selection.
• Cultures remained free of proliferative cells and matured into functional glutamatergic neurons.
• Demonstrated functional synapse formation between ESC-derived V2a INs and motor neurons in vitro.

Conclusions:

• The genetic selection strategy provides a robust method for isolating V2a INs from ESCs.
• These purified V2a INs are suitable for studying their role in neural networks and for developing in vitro models.
• This approach offers a valuable tool for advancing research in spinal cord regeneration and function.