Researchers at the Israel Institute of Technology have made a groundbreaking discovery—the body can regenerate tissues in an unconventional way by reverting aging cells back into a stem‑cell state. Previously, the loss of stem cells was considered irreversible. Tissue “repair” was believed to require transplantation, but it is now evident that the body itself can transform mature cells and replenish its own reserves.
The team conducted a study on the corneas of mice: because the cornea is transparent, they could observe cells by staining them with a special solution. They found that even after stem cells completely disappear, the cornea does not lose its ability to self‑repair. Mature and aging cells turn into new stem cells, function for extended periods, and effectively protect tissues from deterioration.
A critical role in this process belongs to immune‑system cells called macrophages. These cells not only fight bacteria but also trigger regeneration by releasing specific signaling molecules that can activate aging cells, helping them “rejuvenate” and transform into stem cells.
This discovery is extremely significant for medicine: in the future, it may become possible to stimulate the body’s natural healing processes rather than performing cell transplants.
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