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This year's prestigious award in Physiology or Medicine has been granted for revolutionary findings that clarify how the body's defense network targets dangerous pathogens while sparing the healthy tissues.

Three esteemed researchers—from Japan Prof. Sakaguchi and US experts Mary Brunkow and Fred Ramsdell—received this honor.

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

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

These winners will divide a monetary award worth 11m SEK.

Crucial Discoveries

"The research has been essential for understanding how the body's defenses functions and the reason we do not all suffer from serious self-attack conditions," commented the head of the award panel.

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

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

Such cells employ sensors—known as recognition units—that are produced randomly in countless combinations.

That gives the defense network the capacity to combat a broad range of invaders, but the randomness of the mechanism unavoidably creates immune cells that may attack the body.

Security Guards of the Immune System

Scientists previously understood that some of these harmful white blood cells were eliminated in the thymus—the site where white blood cells mature.

The latest award honors the identification of T-reg cells—known as the immune system's "peacekeepers"—which travel through the body to neutralize any immune cells that attack the healthy cells.

We know that this mechanism malfunctions in self-attack conditions such as type-1 diabetes, multiple sclerosis, and rheumatoid arthritis.

A Nobel panel stated, "The findings have established a new field of investigation and spurred the creation of innovative therapies, for example for tumors and autoimmune diseases."

In malignancies, T-regs block the system from fighting the tumor, so studies are focused on lowering their numbers.

In autoimmune diseases, trials are exploring boosting T-reg cells so the organism is no longer under attack. A comparable method could also be useful in reducing the chances of organ transplant failure.

Innovative Studies

Prof Shimon Sakaguchi, of Osaka University, conducted tests on rodents that had their immune gland extracted, leading to self-attack conditions.

The researcher demonstrated that introducing immune cells from healthy mice could prevent the illness—suggesting there was a mechanism for preventing immune cells from harming the host.

Dr. Brunkow, from the a research center in a US city, and Dr. Ramsdell, currently at a biotech firm in San Francisco, were studying an inherited autoimmune disease in rodents and humans that resulted in the identification of a genetic factor critical for the way T-regs operate.

"The pioneering research has uncovered how the body's defenses is kept in check by T-reg cells, preventing it from accidentally attacking the body's own tissues," said a leading physiology specialist.

"The work is a striking example of how basic physiological research can have far-reaching consequences for public health."