Combined microfluidics/protein patterning platform for pharmacological interrogation of axon pathfinding

Area of Science:

• Neuroscience
• Cell Biology
• Biotechnology

Background:

• Axon guidance is crucial for neural circuit assembly.
• Extracellular cues in the environment direct axon navigation.
• Understanding localized cell signaling is key to controlling axon growth.

Purpose of the Study:

• To investigate localized cell signaling in response to axon guidance cues.
• To develop a novel platform for targeted manipulation of neuronal axons.
• To elucidate the role of fibroblast growth factor receptor (FGFR) signaling in N-cadherin-mediated axon guidance.

Main Methods:

• Utilized a microfluidic compartmentalization chamber with protein-micropatterned surfaces.
• Cultured motor neurons derived from embryonic stem cells.
• Applied pharmacological agents to specific neuronal compartments to assess signaling effects.

Main Results:

• N-cadherin effectively guided and accelerated motor axon outgrowth.
• FGFR signaling specifically in the axon, not the cell body, increased axon outgrowth rate.
• FGFR signaling did not alter N-cadherin-mediated axon guidance.

Conclusions:

• Spatial localization of cell signaling critically influences axon outgrowth dynamics.
• The developed microfluidic platform enables precise investigation of localized signaling effects.
• This technology offers a powerful tool for studying diverse signaling systems in neuronal development.