Stanford Finds Skin's Master Switch for Healing & Cancer

Scientists at Stanford Medicine just uncovered how skin decides when to heal itself, and the discovery could change how we treat everything from stubborn wounds to skin cancer.

Two proteins work like a molecular seesaw in our skin, with one pushing stem cells to grow and mature while the other keeps them young and ready. This delicate balance determines whether our skin heals properly, stays healthy, or develops disease.

Dr. Paul Khavari, chair of dermatology at Stanford School of Medicine, led the research team that identified these opposing forces. His team found that proteins called Nedd8 and Sumo2 act as master controllers, switching entire networks of genes on or off to direct skin cell behavior.

The researchers tested their discovery in multiple ways. They grew human skin cells in laboratories, created quarter-sized sheets of artificial skin, and studied genetically modified mice. Every experiment confirmed the same thing: block one protein and skin cells rush to mature, block the other and they refuse to grow up.

When mice couldn't produce Nedd8, their skin developed thick, scaly patches similar to psoriasis. When Sumo2 disappeared, their skin lost its normal layered structure entirely. Both conditions also triggered dramatic changes in immune cells, causing inflammation or other immune responses.

What makes this discovery especially exciting is how specific these proteins are in their effects. Most cellular control systems influence many different processes, making them difficult to target with drugs. These two pathways are remarkably focused, each controlling distinct aspects of skin development.

The team even found existing drugs that can modify these pathways. Applying these medications to lab-grown skin produced the same results as genetic modifications, proving the approach could work in real treatments.

The Ripple Effect

This breakthrough extends far beyond the laboratory. Doctors could potentially use drugs that target these proteins to speed wound healing in diabetic patients, reduce inflammation in people with psoriasis, or even slow skin cancer growth by controlling how quickly cancer cells multiply.

The research also revealed that manipulating these proteins changes the entire skin environment, not just individual cells. Blocking Nedd8 increased neutrophils and caused inflammation, while losing Sumo2 increased T cells. This means treatments targeting these pathways could help with conditions where immune responses play a role.

The findings appeared in the journal Science in June, representing years of work analyzing thousands of genes and proteins. The research team included clinical instructor Dr. Mårten Winge and medical student Leandra Jackrazi, who called the specificity of these effects "unusual and particularly attractive for therapeutic targeting."

Stanford researchers continue studying how these pathways could address skin aging, another area where the balance between stem cell renewal and maturation becomes disrupted.

The discovery gives scientists a new tool for understanding skin health and disease, one that could lead to topical treatments applied directly where they're needed most.