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The prestigious award in Physiology or Medicine has been granted for transformative findings that illuminate how the immune system targets harmful pathogens while sparing the body's own cells.

A trio of esteemed scientists—Japan's Shimon Sakaguchi and American experts Mary Brunkow and Dr. Ramsdell—received this honor.

The research uncovered specialized "sentinels" within the defense system that remove rogue immune cells capable of attacking the organism.

These findings are now enabling new treatments for autoimmune diseases and malignancies.

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

Crucial Discoveries

"The research has been essential for understanding how the immune system functions and the reason we don't all develop severe self-attack conditions," stated the chair of the award panel.

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

Our immune system employs immune cells that search for indicators of infection, including viruses and germs it has not met before.

These cells employ detectors—called receptors—that are generated randomly in a vast number of combinations.

This provides the defense network the ability to fight a broad range of threats, but the unpredictability of the mechanism inevitably creates white blood cells that can target the body.

Protectors of the Body

Researchers previously understood that a portion of these harmful white blood cells were destroyed in the immune organ—where immune cells mature.

This year's award recognizes the discovery of regulatory T-cells—described as the body's "peacekeepers"—which travel through the system to disarm other immune cells that assault the healthy cells.

It is known that this mechanism malfunctions in autoimmune diseases such as juvenile diabetes, multiple sclerosis, and rheumatoid arthritis.

The Nobel panel added, "These findings have established a novel area of investigation and spurred the development of new treatments, for example for cancer and autoimmune diseases."

Regarding malignancies, regulatory T-cells block the body from fighting the growth, so research are focused on lowering their numbers.

In autoimmune diseases, experiments are testing boosting T-reg cells so the body is not under attack. A comparable method could also be effective in reducing the chances of organ transplant rejection.

Innovative Studies

Professor Shimon Sakaguchi, of a Japanese institution, performed experiments on rodents that had their thymus extracted, leading to autoimmune disease.

The researcher showed that injecting immune cells from other animals could stop the illness—suggesting there was a mechanism for preventing defenders from attacking the body.

Dr. Brunkow, affiliated with the Institute for Systems Biology in Seattle, and Fred Ramsdell, now at Sonoma Biotherapeutics in San Francisco, were investigating an inherited autoimmune disease in mice and people that led to the identification of a genetic factor vital for the way regulatory T-cells operate.

"Their groundbreaking research has uncovered how the immune system is controlled by T-reg cells, preventing it from accidentally targeting the body's own tissues," commented a leading biological science specialist.

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