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This year's prestigious award in Physiology or Medicine was granted for transformative discoveries that clarify how the immune system targets dangerous pathogens while sparing the body's own cells.

Three renowned scientists—Japan's Prof. Sakaguchi and US scientists Dr. Brunkow and Dr. Ramsdell—share this accolade.

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

These findings are now enabling innovative treatments for immune disorders and cancer.

These winners will divide a monetary award worth 11m Swedish kronor.

Decisive Discoveries

"Their research has been essential for understanding how the body's defenses operates and why we do not all suffer from severe self-attack conditions," commented the chair of the Nobel Committee.

This trio's research explain a fundamental question: In what way does the defense system defend us from numerous infections while leaving our own tissues intact?

The body's protection system uses immune cells that scan for signs of disease, including pathogens and germs it has never encountered.

Such defenders utilize detectors—known as receptors—that are produced by chance in a vast number of combinations.

This provides the defense network the capacity to fight a wide array of threats, but the randomness of the mechanism inevitably produces white blood cells that can target the host.

Protectors of the Body

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

The latest award honors the identification of T-reg cells—described as the body's "security guards"—which travel through the system to disarm other defenders that assault the body's own tissues.

We know that this mechanism malfunctions in self-attack conditions such as juvenile diabetes, multiple sclerosis, and RA.

A prize committee stated, "These findings have laid the foundation for a novel area of investigation and accelerated the development of new treatments, for example for cancer and autoimmune diseases."

Regarding cancer, regulatory T-cells block the system from fighting the growth, so studies are focused on reducing their quantity.

In self-attack disorders, experiments are testing boosting regulatory T-cells so the body is no longer under attack. A similar approach could also be effective in minimizing the risks of organ transplant rejection.

Pioneering Studies

Prof Sakaguchi, from Osaka University, conducted experiments on mice that had their immune gland removed, leading to self-attack conditions.

The researcher showed that introducing immune cells from healthy animals could stop the disease—suggesting there was a mechanism for blocking immune cells from attacking the host.

Dr. Brunkow, affiliated with the a research center in a US city, and Dr. Ramsdell, currently at Sonoma Biotherapeutics in San Francisco, were investigating an genetic autoimmune disease in rodents and humans that led to the identification of a gene critical for the way regulatory T-cells operate.

"The groundbreaking research has revealed how the body's defenses is controlled by T-reg cells, stopping it from accidentally targeting the healthy cells," said a leading biological science expert.

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