Immature Neurons in Aged Human Brains May Shield Against Alzheimer's Decline
Scientists have long debated whether the adult human brain continues producing new, immature neurons — and whether these cells matter in diseases like Alzheimer's. A new study used advanced single-cell gene sequencing on postmortem human hippocampus tissue from healthy older adults, Alzheimer's patients, and people who showed cognitive resilience despite Alzheimer's pathology. Researchers found that immature neurons persist across all groups, but their gene activity patterns are disrupted in Alzheimer's disease. Crucially, individuals who remained cognitively sharp despite brain pathology retained healthier immature neuron profiles. The findings suggest these young-like cells may actively help maintain brain homeostasis and protect against cognitive decline, opening new avenues for regenerative approaches to Alzheimer's prevention and treatment.