Bundled Three-Dimensional Human Axon Tracts Derived from Brain Organoids

Area of Science:

• Neuroscience
• Biotechnology
• Tissue Engineering

Background:

• Restoring cerebral connectivity is crucial for brain function after neurological damage.
• Current strategies face challenges like growth inhibitors and limited neuron regeneration in vivo.
• Transplantable axon tracts offer a novel therapeutic approach.

Purpose of the Study:

• To generate and characterize three-dimensional human axon tracts from brain organoids.
• To explore the potential of these engineered constructs for reconstructing brain circuits.

Main Methods:

• Generation of centimeter-long, 3D human axon tracts from brain organoids.
• Encasing constructs in an agarose shell for physical manipulation.
• Analysis of cellular composition, phenotype, and axon connectivity.

Main Results:

• Successfully generated centimeter-long axon tracts with discrete gray and white matter-like regions.
• Demonstrated emulation of cerebral cortex features, including neurons with distinct cortical layer phenotypes.
• Confirmed connectivity within the engineered neural tissue.

Conclusions:

• Engineered neural tissue represents a significant advancement in creating transplantable axon tracts.
• This approach provides a foundation for physically replacing damaged neuronal populations and long-range connections.
• Offers a potential strategy for reconstructing brain circuits in neurological disorders.