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The prestigious award in Physiology or Medicine was granted for transformative findings that clarify how the body's defense network targets harmful infections while sparing the healthy tissues.

Three renowned scientists—Japan's Prof. Sakaguchi and American experts Mary Brunkow and Fred Ramsdell—share this honor.

The work identified unique "security guards" within the defense system that eliminate malfunctioning defense cells that could attacking the organism.

The findings are now paving the way for innovative therapies for immune disorders and cancer.

These laureates will divide a monetary award worth 11 million SEK.

Decisive Findings

"The research has been essential for understanding how the body's defenses functions and the reason we don't all develop severe self-attack conditions," stated the chair of the Nobel Committee.

The team's research address a core mystery: In what way does the immune system defend us from countless invaders while keeping our healthy cells unharmed?

The immune system uses immune cells that search for signs of disease, even pathogens and germs it has not met before.

Such cells employ detectors—known as recognition units—that are generated randomly in countless variations.

That gives the immune system the ability to fight a wide array of threats, but the randomness of the process unavoidably produces immune cells that may attack the host.

Protectors of the Body

Researchers previously knew that a portion of these problematic defense cells were eliminated in the thymus—the site where immune cells develop.

This year's award recognizes the discovery of regulatory T-cells—described as the immune system's "peacekeepers"—which travel through the system to neutralize other immune cells that assault the body's own tissues.

It is known that this process fails in autoimmune diseases such as type-1 diabetes, MS, and rheumatoid arthritis.

The prize committee stated, "The findings have established a new field of investigation and accelerated the development of new therapies, for example for tumors and autoimmune diseases."

Regarding malignancies, regulatory T-cells block the system from attacking the tumor, so studies are aimed at lowering their quantity.

In self-attack disorders, experiments are exploring boosting regulatory T-cells so the body is not under attack. A comparable approach could also be useful in reducing the chances of organ transplant rejection.

Innovative Experiments

Professor Shimon Sakaguchi, of Osaka University, conducted experiments on rodents that had their immune gland extracted, causing autoimmune disease.

He demonstrated that injecting defense cells from healthy mice could stop the illness—suggesting there was a system for preventing immune cells from attacking the body.

Dr. Brunkow, affiliated with the a research center in Seattle, and Fred Ramsdell, now at Sonoma Biotherapeutics in San Francisco, were investigating an genetic autoimmune disease in rodents and humans that resulted in the identification of a genetic factor critical for how regulatory T-cells function.

"Their groundbreaking research has uncovered how the body's defenses is controlled by T-reg cells, preventing it from accidentally attacking the healthy cells," commented a leading biological science specialist.

"This research is a remarkable example of how fundamental physiological research can have far-reaching consequences for human health."