Hair Graying as an Evolutionary Checkpoint Against Malignancy: A Stem Cell Perspective

The article discusses hair graying as an evolutionary strategy to prevent cancer by maintaining genomic integrity in melanocyte stem cells (McSCs). Graying occurs due to oxidative stress, neuroendocrine dysregulation, and genotoxic stress, which cause McSCs to differentiate prematurely, reducing the risk of melanoma. While therapeutic approaches aim to reverse graying through niche bioengineering and molecular modulation, they must carefully balance restoring pigmentation with the potential risk of cancer. Understanding the interactions between immune, nervous, and stem cell systems could lead to new regenerative medicine therapies.