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We may now know why young blood can have rejuvenating effects

Packages of RNA and proteins that bud off from cells have reversed some signs of ageing in mice, and they may account for the rejuvenating effects of young blood

Health 10 March 2022

Red blood cells in a blood vessel, computer artwork.

Artwork showing red blood cells

SCIEPRO/SCIENCE PHOTO LIBRARY

The rejuvenating effect of young blood could be largely due to certain packages of RNA and proteins packages of RNA and proteins that bud off from some cells and travel via the blood to other cells. When researchers injected these cell buds into old mice, it reversed several signs of ageing, including boosting muscle strength and hair growth and improving coordination and endurance.

“What we saw was that the physical performance of the animals was better,” says Consuelo Borrás at the University of Valencia in Spain. …