GoKawiilMouse and human heart transplant studies find donor age effect fades fast
Researchers led by Jesse Poganik at Brigham and Women's Hospital transplanted young hearts into middle-aged mice and middle-aged hearts into young mice, implanting the extra organ in the neck to compare it with the original. Using three molecular 'aging clocks' to measure biological age, the team found that transplanted hearts largely took on the biological age profile of the recipient rather than retaining the age of the donor, a pattern also suggested by records from human heart transplant recipients.
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The result complicates the popular idea, drawn from young-blood studies, that simply introducing young tissue can reverse aging elsewhere in the body. It suggests that an organ's biological age may be strongly shaped by its systemic environment rather than fixed at the cellular level, which could inform how transplant outcomes and organ longevity are understood. The findings also imply that rejuvenation strategies may need to address whole-body signals rather than just swapping in younger tissue.
- Transplanted hearts in mice and humans tend to adopt the recipient's biological age rather than keeping the donor's.
- The study used three molecular aging clocks to track biological age changes after transplantation.
- Findings challenge simple 'young organ as fountain of youth' theories and point to systemic factors in aging.
Source: technologyreview.com — Jessica Hamzelou, 2026-09-25
Published there as: “Young organs may not be a fountain of youth for recipients”
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