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The prestigious award in medical science was awarded for revolutionary findings that illuminate how the immune system targets dangerous pathogens while sparing the body's own cells.

A trio of renowned scientists—Japan's Prof. Sakaguchi and American experts Dr. Brunkow and Fred Ramsdell—received this accolade.

Their work identified specialized "security guards" within the defense system that eliminate rogue defense cells that could attacking the body.

These discoveries are now enabling innovative therapies for autoimmune diseases and cancer.

The laureates will share a prize fund valued at 11m Swedish kronor.

Crucial Discoveries

"The research has been decisive for comprehending how the body's defenses functions and why we do not all develop severe autoimmune diseases," commented the chair of the award panel.

This trio's research explain a fundamental mystery: In what way does the defense system protect us from countless infections while leaving our healthy cells unharmed?

Our immune system uses white blood cells that scan for signs of infection, including viruses and germs it has never encountered.

These cells employ detectors—known as receptors—that are generated randomly in countless variations.

That gives the defense network the capacity to combat a wide array of threats, but the randomness of the process unavoidably creates white blood cells that can attack the body.

Protectors of the Immune System

Researchers previously understood that some of these harmful defense cells were destroyed in the thymus—the site where immune cells develop.

The latest award recognizes the identification of regulatory T-cells—described as the immune system's "peacekeepers"—which patrol the system to neutralize other defenders that assault the healthy cells.

We know that this mechanism fails in self-attack conditions such as juvenile diabetes, MS, and rheumatoid arthritis.

A Nobel panel added, "The discoveries have laid the foundation for a novel area of research and spurred the creation of new therapies, for example for cancer and autoimmune diseases."

In malignancies, regulatory T-cells prevent the body from fighting the tumor, so studies are aimed at reducing their quantity.

In autoimmune diseases, trials are exploring boosting regulatory T-cells so the body is not under attack. A similar method could also be useful in reducing the chances of organ transplant failure.

Innovative Experiments

Professor Sakaguchi, from Osaka University, performed tests on mice that had their immune gland removed, causing self-attack conditions.

He showed that injecting defense cells from other animals could prevent the disease—implying there was a system for blocking defenders from attacking the body.

Dr. Brunkow, from the a research center in Seattle, and Dr. Ramsdell, now at Sonoma Biotherapeutics in San Francisco, were studying an genetic immune disorder in rodents and people that led to the identification of a gene vital for how regulatory T-cells operate.

"The pioneering work has uncovered how the body's defenses is kept in check by regulatory T cells, stopping it from accidentally targeting the healthy cells," commented a prominent biological science specialist.

"This work is a striking illustration of how basic physiological research can have broad implications for human health."