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The prestigious award in medical science was awarded for transformative findings that clarify how the body's defense network targets dangerous pathogens while sparing the body's own cells.

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

Their research uncovered specialized "sentinels" within the immune system that remove rogue immune cells capable of attacking the body.

The discoveries are now enabling new treatments for immune disorders and cancer.

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

Decisive Findings

"The research has been essential for comprehending how the immune system operates and why we don't all suffer from severe autoimmune diseases," commented the head of the award panel.

The trio's studies explain a core mystery: In what way does the defense system protect us from countless infections while leaving our own tissues intact?

Our immune system uses white blood cells that scan for indicators of infection, even viruses and germs it has not met before.

Such defenders utilize sensors—known as recognition units—that are produced by chance in a vast number of combinations.

That provides the immune system the ability to combat a broad range of invaders, but the unpredictability of the process inevitably creates white blood cells that may attack the body.

Protectors of the Body

Researchers previously knew that a portion of these problematic defense cells were destroyed in the thymus—where white blood cells mature.

The latest award honors the identification of regulatory T-cells—described as the body's "security guards"—which travel through the system to neutralize any defenders that assault the healthy cells.

We know that this process fails in self-attack conditions such as juvenile diabetes, multiple sclerosis, and rheumatoid arthritis.

A Nobel panel stated, "The discoveries have established a new field of research and accelerated the creation of new treatments, for instance for cancer and autoimmune diseases."

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

For self-attack disorders, trials are testing boosting regulatory T-cells so the body is not being harmed. A comparable approach could also be useful in minimizing the chances of organ transplant failure.

Innovative Experiments

Prof Shimon Sakaguchi, of Osaka University, performed experiments on mice that had their immune gland removed, causing self-attack conditions.

He demonstrated that injecting defense cells from other mice could prevent the illness—implying there was a mechanism for blocking defenders from harming the body.

Mary Brunkow, affiliated with the a research center in a US city, and Fred Ramsdell, now at a biotech firm in a California city, were studying an inherited immune disorder in mice and people that led to the identification of a gene vital for the way T-regs operate.

"Their pioneering work has uncovered how the body's defenses is controlled by T-reg cells, stopping it from mistakenly targeting the healthy cells," commented a prominent physiology expert.

"This work is a striking example of how basic physiological study can have broad consequences for public health."