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The prestigious award in Physiology or Medicine has been granted for revolutionary discoveries that illuminate how the immune system attacks harmful infections while protecting the healthy tissues.

A trio of esteemed researchers—Japan's Shimon Sakaguchi and US scientists Mary Brunkow and Fred Ramsdell—share this accolade.

Their work identified specialized "sentinels" within the immune system that eliminate rogue defense cells capable of harming the body.

The findings are now enabling new therapies for immune disorders and cancer.

These winners will share a prize fund worth 11m SEK.

Decisive Findings

"Their research has been essential for comprehending how the immune system functions and the reason we don't all suffer from severe self-attack conditions," stated the head of the award panel.

This team's research address a fundamental question: In what way does the immune system protect us from countless invaders while leaving our healthy cells unharmed?

The immune system employs white blood cells that scan for signs of disease, even pathogens and germs it has never encountered.

Such defenders employ detectors—called recognition units—that are produced randomly in countless combinations.

That gives the immune system the ability to fight a wide array of invaders, but the unpredictability of the process inevitably creates immune cells that can attack the body.

Protectors of the Immune System

Researchers earlier understood that some of these harmful defense cells were eliminated in the thymus—where immune cells develop.

This year's Nobel Prize recognizes the identification of T-reg cells—described as the immune system's "security guards"—which travel through the system to neutralize other immune cells that assault the healthy cells.

It is known that this process malfunctions in autoimmune diseases such as juvenile diabetes, MS, and rheumatoid arthritis.

The Nobel panel stated, "The discoveries have established a new field of investigation and accelerated the development of new therapies, for instance for tumors and autoimmune diseases."

Regarding cancer, regulatory T-cells prevent the system from attacking the growth, so studies are focused on reducing their numbers.

In self-attack disorders, experiments are exploring boosting regulatory T-cells so the organism is no longer being harmed. A comparable method could also be effective in reducing the risks of transplanted organ rejection.

Pioneering Experiments

Professor Shimon Sakaguchi, from a Japanese institution, conducted experiments on mice that had their thymus removed, leading to autoimmune disease.

The researcher showed that introducing immune cells from other mice could stop the disease—suggesting there was a mechanism for preventing immune cells from attacking the host.

Mary Brunkow, affiliated with the Institute for Systems Biology in Seattle, and Fred Ramsdell, currently at Sonoma Biotherapeutics in a California city, were studying an genetic immune disorder in rodents and humans that led to the identification of a genetic factor critical for how regulatory T-cells function.

"Their groundbreaking research has revealed how the body's defenses is kept in check by T-reg cells, stopping it from accidentally attacking the healthy cells," said a leading physiology expert.

"This research is a remarkable example of how basic biological research can have broad implications for public health."