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The Nobel Prize in medical science was granted for transformative findings that clarify how the body's defense network targets harmful pathogens while protecting the healthy tissues.

A trio of renowned scientists—from Japan Prof. Sakaguchi and American scientists Mary Brunkow and Fred Ramsdell—share this honor.

Their research uncovered unique "sentinels" within the defense system that eliminate malfunctioning defense cells capable of attacking the organism.

These findings are now paving the way for new treatments for autoimmune diseases and cancer.

The winners will divide a monetary award valued at 11 million SEK.

Decisive Discoveries

"Their work has been essential for understanding how the immune system functions and why we do not all suffer from severe autoimmune diseases," commented the chair of the Nobel Committee.

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

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

These cells employ sensors—called receptors—that are generated by chance in a vast number of variations.

That provides the immune system the ability to combat a wide array of invaders, but the randomness of the process unavoidably produces white blood cells that can target the host.

Security Guards of the Immune System

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

This year's Nobel Prize recognizes the discovery of T-reg cells—known as the body's "security guards"—which travel through the system to neutralize any defenders that assault the body's own tissues.

We know that this process malfunctions in autoimmune diseases such as type-1 diabetes, multiple sclerosis, and rheumatoid arthritis.

A prize committee added, "The discoveries have laid the foundation for a new field of investigation and spurred the development of new treatments, for example for cancer and immune disorders."

In cancer, regulatory T-cells block the body from fighting the growth, so research are aimed at reducing their quantity.

In autoimmune diseases, trials are testing boosting T-reg cells so the organism is no longer being harmed. A comparable method could also be useful in minimizing the risks of transplanted organ rejection.

Pioneering Studies

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

He demonstrated that introducing defense cells from healthy animals could prevent the illness—implying there was a system for blocking immune cells from harming the host.

Mary Brunkow, from the a research center in a US city, and Dr. Ramsdell, currently at a biotech firm in San Francisco, were investigating an inherited immune disorder in rodents and people that led to the discovery of a gene vital for the way regulatory T-cells function.

"The groundbreaking work has uncovered how the immune system is controlled by T-reg cells, stopping it from accidentally targeting the healthy cells," commented a prominent physiology expert.

"The research is a remarkable illustration of how fundamental physiological research can have broad implications for human health."