Neural Stem Cells Rebuild Stroke-Damaged Brain and Restore Movement in Mice

Researchers at the University of Zurich showed that human neural stem cells derived from induced pluripotent stem cells, transplanted into stroke-damaged mouse brains, survived for five weeks, differentiated into neurons, and integrated with existing networks while also triggering broader repair (new blood vessels, reduced inflammation, and a stronger blood-brain barrier). These changes correlated with restored movement, with better outcomes when transplantation occurred one week after stroke. The team is pursuing safer, animal-free production, a safety switch to prevent overgrowth, and less invasive delivery methods as they move toward human trials.