Recent research conducted by scientists at Brigham and Women’s Hospital suggests that transplanting young organs into older bodies may not provide the anti-aging benefits some have theorized. The study, which analyzed heart transplants in both mice and humans, found that donor hearts rapidly align with the biological age of the recipient.

Led by Jesse Poganik, the research team utilized "aging clocks"—molecular tools designed to estimate biological tissue age—to monitor heart transplants in mice. Contrary to the hypothesis that a young organ might rejuvenate an older host, the transplanted hearts appeared to adopt the biological age of the recipient within four to six months. Specifically, young hearts showed signs of accelerated aging, while older hearts appeared to become biologically younger after being placed in a new environment. Further analysis revealed that the presence of a new heart did not significantly alter the biological age of the recipient's other organs or blood.

Advertisement

The team corroborated these findings by examining historical biopsy data from human heart transplant patients at Brigham and Women’s Hospital. The results mirrored the mouse study, indicating that donor hearts consistently matched the biological age of the recipient regardless of the donor's original age. João Pedro de Magalhães, an aging researcher at the University of Birmingham who was not involved in the study, suggested that the recipient's immune system might play a role in this biological synchronization.

Poganik noted that these findings could have practical implications for transplant medicine, potentially encouraging the use of hearts from older donors that are currently discarded. However, the study also underscores the immense complexity of the aging process. Poganik cautioned that achieving true, systemic age reversal remains a significant challenge, as it would require simultaneously addressing diverse forms of cellular and structural degradation across the entire body.

Source: MIT Technology Review