Jayakumar Rajadas

The AAES congratulates Dr. Tracy Wang on her election as President-Elect of the Society of University Surgeons!

The proteins that reverse aging are the same ones that accelerate cancer. UCSF screened 200 transcription factors and found 4 that push old cells back to a youthful state. Two of them, EZH2 and E2F3, are classified oncogenes. EZH2 is overexpressed in melanoma, ovarian, breast, endometrial, bladder, renal, lung, and liver cancer. It silences tumor suppressor genes including p16. E2F3 shows overexpression in 67% of prostate cancers and independently predicts worse survival. The mechanism that makes old cells divide again is the same mechanism that makes cancer cells divide uncontrollably. This is the central tradeoff in longevity science that nobody wants to talk about. Senescence evolved as tumor suppression. Cells that stop dividing can’t become cancer. Reverse that brake, and you’re rolling dice on which cells wake up first. The mouse results are real. In 20-month-old mice (equivalent to 65 human years), EZH2 reversed liver fibrosis, cut liver fat in half, and improved glucose tolerance. But the same protein that regenerated liver tissue also drives prostate cancer proliferation and acts as a coactivator for androgen receptor signaling. The researchers acknowledge they’re looking for “safer rejuvenation therapies.” That phrasing tells you the current approach has a safety problem. Aging research keeps running into this wall: the pathways that decline with age often declined because evolution selected for cancer suppression over longevity. You don’t reverse aging without confronting that tradeoff. The real breakthrough will be tissue-specific or temporally controlled activation. Until then, every “reverse aging” headline needs an asterisk.

Interesting CELLULAR AGING BREAKTHROUGH Scientists may have found a molecular blueprint to revive old cells. A new UCSF study identified four key transcription factors, E2F3, EZH2, STAT3, and ZFX, that can push aged cells back into a youthful state. By reactivating this gene control network, old human cells regained higher energy levels, increased cell division, and younger gene expression patterns. In aged mice, activating one of these factors reduced liver fat and scarring and improved glucose metabolism, making old tissue function more like young tissue. This discovery suggests aging isn’t just damage, it’s a loss of coordinated gene regulation that may be partially reversible. Instead of replacing cells or turning them into stem cells, this approach hints at resetting cells from within, opening a new path toward therapies focused on extending healthspan, not just lifespan.