Researchers at the University of Bonn have directly converted blood-cell precursors from an 80-year-old donor into neural stem cells that displayed an epigenetic age below 20. Published in the journal Aging Cell, the slow 100-day laboratory process offers a new model for studying cellular aging mechanisms.
Direct Reprogramming of Elderly Blood Cells
Scientists in Germany have reprogrammed blood-cell precursors from an elderly donor into neural stem cells using specialised proteins called transcription factors. Researchers from the University Hospital of Bonn and the University of Bonn announced findings showing that human cells can display biological characteristics associated with much younger tissue.
Working under the direction of neurobiologists from the University of Bonn, Germany, investigators managed to transform blood cell progenitors originating from an 80-year-old donor into neural stem cells. The research involved donor cells from 15 people across the age spectrum, ranging from newborn to 101 years of age, including cells derived from a 101-year-old donor. Scientists specifically utilized erythroid progenitor cells, which are akin to red blood cells that have not yet graduated college, and turned them into induced neural stem cells, which function as the pre-graduate cells of the brain.
The study utilized erythroid progenitor cells, which function as red blood cells that have not yet fully matured. Researchers used transcription factor cocktails to force the cells to alter their developmental trajectory, shifting from a blood-cell identity directly into induced neural stem cells.
Epigenetic Clocks Reset Over a 100-Day Timeline
Cellular age is estimated by examining epigenetic markers, which are chemical modifications to DNA that regulate gene activity without altering the underlying genetic code. When the Bonn team applied these molecular clocks to the reprogrammed cells, the results showed a dramatic shift. Following the procedure, cells originating from an 80-year-old individual possessed a molecular age of less than 20 years, demonstrating a rollback of approximately six decades.
Unlike traditional two-step reprogramming protocols that first force cells into a pluripotent embryonic state before redifferentiation, the direct conversion method bypassed the intermediate stage entirely. This avoided rapid resetting, allowing researchers to track the gradual rejuvenation process for over 100 days. Through this approach, the converted cells became 60 years younger in 50 days.
Rejuvenation that extends over such a long period of time is ideal as an experimental model: Since the epigenetic clocks are slowly reset over several weeks, we can use this model to investigate which factors and active substances accelerate or slow down the rejuvenation process.
Professor Oliver Brüstle, director of the Institute of Reconstructive Neurobiology at the University Hospital of Bonn
Converted Cells Behave Like Young Neural Stem Cells
The research team emphasized that the observed age reversal was not merely superficial. The converted cells actually behave like young cells, adopting the functional characteristics expected of youthful neural stem cells rather than just displaying youthful chemical signatures.
Despite the striking laboratory findings, researchers cautioned against interpreting the work as a method for reversing aging in living humans. The study examined cells under controlled in vitro conditions, and epigenetic age estimates serve only as a proxy for biological aging rather than a complete measure of cellular health.
Like I said before, we're entering an era where aging itself could become a target of scientific intervention.Here's a small hint of what's coming.SCIENTISTS JUST REJUVENATED 80-YEAR-OLD CELLS TO A MOLECULAR AGE OF UNDER 20! 🤯Researchers at the University of Bonn directly… pic.twitter.com/0STaWXTpqJ