Blood precursor cells reprogrammed into neural stem cells with rewound age
Researchers converted blood precursor cells from young and older donors, including people over 80, into neural stem cells. Direct reprogramming produced a gradual reversal of an epigenetic clock over more than 100 days, while a route through pluripotent stem cells reset the clock faster. DNA methylation was used as a proxy for biological age.
The study compared two reprogramming routes using human blood cell precursors from younger and older donors, including individuals past 80. One route converted them directly into induced neural stem cells; the other passed through induced pluripotent stem cells before neural conversion. Biological age was estimated from DNA methylation patterns, a proxy rather than a direct functional measure.
Directly converted cells displayed a slow age reversal tracked beyond 100 days, whereas the pluripotent intermediate route produced a faster return toward an embryonic-like age estimate. Gene activity in the direct route shifted over weeks, and cells from young and old donors became more similar. The authors propose this gradual system may help probe factors influencing rejuvenation.
This research could influence how scientists model aging and neurodegenerative disease, since neural cells derived from older donors may help study age-related vulnerability. It may also inform future regenerative medicine by exploring blood cells as a starting material for neural repair. Patients and older donors could benefit indirectly through better disease models or drug screening, though clinical use remains uncertain. Practical and ethical questions around reprogramming and donor consent may accompany such advances.