3D Compartmentalised Human Pluripotent Stem Cell-derived Neuromuscular Co-cultures.

Area of Science:

• Neuroscience
• Stem Cell Biology
• Biomedical Engineering

Background:

• Human neuromuscular diseases (e.g., DMD, ALS) have unmet clinical needs.
• Axonal and neuromuscular synapse dysfunction are key pathological events in these disorders.
• Accurate in vitro models are needed to study neuromuscular physiology.

Purpose of the Study:

• To develop a 3D microphysiological system for generating functional human neuromuscular circuits in vitro.
• To model neuromuscular diseases and test potential therapeutic interventions.

Main Methods:

• Co-culture of human pluripotent stem cell (PSC)-derived motor neurons/astrocytes and PSC-derived myofibers in 3D compartmentalised microdevices.
• Spatial separation of neural and muscle compartments connected by microchannels.
• Utilisation of optogenetics, particle image velocimetry (PIV), and immunocytochemistry for functional analysis.

Main Results:

• Successful generation of functional human neuromuscular circuits in vitro.
• Demonstration of axonal projection from a CNS-like compartment to innervate muscle.
• Application of the model to study disease-specific phenotypes in DMD and ALS models.
• Testing of candidate drugs for rescuing pathological phenotypes.

Conclusions:

• The developed microphysiological model accurately recapitulates in vivo-like neuromuscular circuit organization.
• This system offers a simple, robust platform for studying neuromuscular diseases and facilitating drug discovery.
• The model's design allows for high-power imaging and future live axonal transport and synaptic imaging assays.