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This year's prestigious award in medical science was granted for transformative discoveries that illuminate how the body's defense network targets dangerous infections while protecting the healthy tissues.

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

Their work identified unique "security guards" within the immune system that eliminate malfunctioning defense cells capable of attacking the organism.

The findings are now enabling innovative therapies for immune disorders and malignancies.

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

Decisive Discoveries

"Their work has been decisive for understanding how the body's defenses functions and why we don't all develop serious autoimmune diseases," stated the chair of the Nobel Committee.

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

The body's protection system uses immune cells that scan for indicators of infection, including pathogens and germs it has not met before.

These cells utilize sensors—known as receptors—that are produced by chance in a vast number of variations.

This gives the defense network the ability to fight a wide array of threats, but the unpredictability of the process unavoidably creates white blood cells that may attack the host.

Protectors of the Body

Researchers previously understood that some of these harmful white blood cells were destroyed in the thymus—the site where immune cells develop.

This year's Nobel Prize recognizes the identification of regulatory T-cells—described as the immune system's "peacekeepers"—which patrol the system to disarm other defenders that assault the healthy cells.

We know that this process fails in self-attack conditions such as juvenile diabetes, MS, and rheumatoid arthritis.

The Nobel panel added, "The findings have laid the foundation for a new field of research and accelerated the development of new therapies, for example for tumors and autoimmune diseases."

In cancer, regulatory T-cells block the system from attacking the growth, so studies are aimed at reducing their quantity.

In self-attack disorders, experiments are testing increasing regulatory T-cells so the body is not under attack. A similar method could also be effective in minimizing the risks of transplanted organ rejection.

Innovative Experiments

Prof Sakaguchi, of a Japanese institution, conducted experiments on mice that had their immune gland extracted, leading to self-attack conditions.

The researcher showed that introducing defense cells from other mice could prevent the disease—suggesting there was a mechanism for blocking defenders from harming the body.

Mary Brunkow, from the a research center in Seattle, and Dr. Ramsdell, currently at Sonoma Biotherapeutics in a California city, were studying an genetic autoimmune disease in mice and humans that led to the discovery of a genetic factor vital for how regulatory T-cells operate.

"The groundbreaking research has uncovered how the immune system is kept in check by T-reg cells, stopping it from accidentally attacking the body's own tissues," commented a leading physiology specialist.

"The research is a remarkable illustration of how basic biological research can have broad consequences for public health."