Nature Aging Study Ties SIRT3 Loss in Blood Stem Cells to 2-Year Mice's Organ Decline
Updated
Updated · ScienceAlert · Aug 17
Nature Aging Study Ties SIRT3 Loss in Blood Stem Cells to 2-Year Mice's Organ Decline
3 articles · Updated · ScienceAlert · Aug 17
Summary
Two mouse experiments found aging blood stem cells can drive decline beyond the bone marrow, with immune cells from SIRT3-boosted stem cells improving muscle function, blood sugar control and lung structure.
SIRT3 levels fall with age in mouse and human blood stem cells, and the protein appears to stop those cells from overproducing inflammation-promoting immune cells that can damage distant tissues.
Mice rebuilt with SIRT3-enhanced stem cells later ran farther, gripped longer, performed better on memory tests and showed healthier lungs than animals given unaltered stem cells.
The study, published in Nature Aging, does not show SIRT3 slows aging or extends life in people; the work used genetically altered cells in mice, and transplant preparation may have influenced results.
Researchers now need to test whether the same mechanism operates in humans, which could eventually make blood stem cells a target for reducing age-related inflammation across the body.
If SIRT3 loss makes blood stem cells produce more inflammatory immune cells, could targeting the bone marrow become a future anti-inflammaging therapy?
The mice improved even after immune-cell transfer alone—does that mean aging may be rewired through the immune system rather than each organ separately?