Microfluidic Cultures of Basal Forebrain Cholinergic Neurons for Assessing Retrograde Cell Death by Live Imaging

Area of Science:

• Neuroscience
• Cell Biology
• Neurodegenerative Disease Research

Background:

• Basal forebrain cholinergic neurons (BFCNs) have extensive axons and express neurotrophin receptors (p75NTR, Trk) that influence survival or apoptosis.
• Axon targets can create microenvironments affecting neuronal health, particularly in neurodegenerative conditions like seizure and brain injury.

Purpose of the Study:

• To develop a method for studying the effects of axon-specific versus soma-specific stimuli on BFCN health and survival.
• To establish an in vitro model that mimics the distinct microenvironments of BFCN axons and somas in vivo.

Main Methods:

• Utilizing microfluidic devices to compartmentalize and culture BFCNs, separating axons from somas.
• Implementing localized treatments to either the axons or somas of BFCNs.
• Employing live imaging of retrogradely labeled BFCNs to assess stimuli-induced cell death.

Main Results:

• Successfully separated BFCN axons and somas in vitro using microfluidic chambers.
• Demonstrated compartmentalized treatment of BFCN axons or somas.
• Established a method for live imaging of BFCNs to assess retrograde cell death.

Conclusions:

• The developed compartmental culture system allows for the investigation of axon- or soma-specific stimuli effects on BFCN health, maintenance, and death.
• This in vitro model can be applied to study mechanisms underlying neurodegenerative disorders and brain injury.
• Novel method for tracing and imaging live BFCNs exposed to distal axon stimuli to assess retrograde cell death.