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The Nobel Prize in medical science has been awarded for revolutionary findings that illuminate how the immune system targets harmful infections while sparing the body's own cells.

A trio of esteemed scientists—from Japan Shimon Sakaguchi and American scientists Mary Brunkow and Fred Ramsdell—share this accolade.

Their work uncovered unique "security guards" within the defense system that remove rogue immune cells that could attacking the body.

The findings are now paving the way for new treatments for immune disorders and malignancies.

The winners will divide a prize fund valued at 11 million Swedish kronor.

Decisive Discoveries

"The work has been decisive for comprehending how the immune system functions and why we don't all develop serious self-attack conditions," commented the chair of the Nobel Committee.

The team's research address a core question: In what way does the immune system defend us from countless invaders while leaving our healthy cells intact?

Our body's protection system employs immune cells that scan for indicators of infection, including pathogens and germs it has never encountered.

These cells utilize sensors—called recognition units—that are generated randomly in a vast number of combinations.

That gives the defense network the ability to combat a wide array of threats, but the randomness of the mechanism unavoidably produces white blood cells that may target the body.

Security Guards of the Immune System

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

This year's Nobel Prize recognizes the identification of regulatory T-cells—described as the body's "security guards"—which travel through the body to disarm other defenders that assault the body's own tissues.

It is known that this mechanism fails in autoimmune diseases such as juvenile diabetes, MS, and rheumatoid arthritis.

A prize committee added, "The findings have laid the foundation for a novel area of investigation and spurred the creation of new treatments, for example for cancer and autoimmune diseases."

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

In autoimmune diseases, experiments are testing increasing T-reg cells so the body is no longer being harmed. A comparable approach could also be effective in reducing the chances of transplanted organ rejection.

Pioneering Experiments

Professor Sakaguchi, from Osaka University, conducted experiments on mice that had their immune gland extracted, leading to autoimmune disease.

The researcher demonstrated that introducing immune cells from other animals could prevent the illness—implying there was a mechanism for blocking immune cells from attacking the body.

Mary Brunkow, from the a research center in a US city, and Dr. Ramsdell, now at Sonoma Biotherapeutics in San Francisco, were investigating an inherited immune disorder in rodents and people that resulted in the identification of a gene vital for the way T-regs operate.

"The groundbreaking work has revealed how the body's defenses is kept in check by regulatory T cells, stopping it from mistakenly attacking the healthy cells," said a leading physiology expert.

"The work is a remarkable illustration of how fundamental physiological research can have far-reaching consequences for public health."