Engineered thoracic spinal cord organoids for transplantation after spinal cord injury.

Thoracic vertebral segment-specific spinal cord organoids (enTsOrg) restore hind-limb motor function in a spinal cord injury mouse model and enhance in vivo neuroelectric conduction.

• Why it matters: Native spinal cord heterogeneity and stereotyped spatial organization make it hard for organoids to match cellular composition, segmental layout, and dorsoventral features needed for repair.
• What they did: enTsOrg were engineered from fibroblast-derived induced pluripotent stem cells and assembled in a basement membrane hydrogel using a layered double-hydroxide matrix (Matrigel), then grafted into injured mice.
• The result: Grafts showed advanced maturation and organized distribution of thoracic segment–specific neuronal subtypes, enabling synaptic connections, circuit restructuring in paralyzed animals, and hind-limb motor recovery.

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