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This year's prestigious award in medical science has been awarded for transformative discoveries that illuminate how the body's defense network attacks dangerous pathogens while sparing the healthy tissues.

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

Their research identified specialized "sentinels" within the immune system that eliminate malfunctioning immune cells capable of harming the body.

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

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

Decisive Findings

"Their research has been essential for understanding how the immune system operates and the reason we don't all suffer from serious autoimmune diseases," stated the chair of the Nobel Committee.

The team's studies address a core mystery: In what way does the defense system defend us from countless infections while keeping our healthy cells unharmed?

Our immune system uses white blood cells that scan for signs of infection, even viruses and germs it has not met before.

Such cells utilize sensors—known as recognition units—that are generated by chance in a vast number of variations.

This provides the defense network the capacity to fight a broad range of threats, but the randomness of the process inevitably creates immune cells that can attack the host.

Security Guards of the Immune System

Scientists earlier knew that a portion of these harmful defense cells were destroyed in the immune organ—the site where immune cells mature.

This year's award honors the identification of regulatory T-cells—known as the immune system's "security guards"—which travel through the system to neutralize any immune cells that assault the body's own tissues.

It is known that this mechanism fails in autoimmune diseases such as type-1 diabetes, MS, and rheumatoid arthritis.

The prize committee added, "These findings have established a new field of investigation and accelerated the creation of new therapies, for example for tumors and immune disorders."

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

For self-attack disorders, trials are testing boosting regulatory T-cells so the organism is no longer being harmed. A comparable method could also be useful in minimizing the chances of transplanted organ rejection.

Innovative Experiments

Prof Sakaguchi, of Osaka University, performed tests on mice that had their immune gland extracted, causing self-attack conditions.

The researcher demonstrated that introducing immune cells from healthy mice could stop the disease—implying there was a mechanism for preventing immune cells from harming the body.

Mary Brunkow, affiliated with the Institute for Systems Biology in Seattle, and Dr. Ramsdell, now at a biotech firm in a California city, were investigating an genetic autoimmune disease in rodents and humans that led to the identification of a genetic factor vital for how regulatory T-cells operate.

"The groundbreaking research has revealed how the immune system is kept in check by T-reg cells, preventing it from mistakenly targeting the body's own tissues," said a prominent biological science specialist.

"The work is a remarkable illustration of how fundamental biological study can have far-reaching consequences for human health."