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The prestigious award in medical science was awarded for transformative findings that clarify how the immune system attacks harmful infections while sparing the healthy tissues.

A trio of renowned scientists—Japan's Shimon Sakaguchi and American experts Mary Brunkow and Fred Ramsdell—received this accolade.

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

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

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

Crucial Findings

"The research has been essential for understanding how the body's defenses functions and the reason we don't all develop serious autoimmune diseases," stated the head of the Nobel Committee.

The trio's research explain a core mystery: In what way does the defense system protect us from countless invaders while leaving our healthy cells intact?

Our body's protection system employs immune cells that scan for signs of infection, including viruses and bacteria it has never encountered.

These defenders employ detectors—known as recognition units—that are produced by chance in countless combinations.

That provides the defense network the ability to fight a broad range of invaders, but the randomness of the mechanism unavoidably produces white blood cells that may target the host.

Protectors of the Body

Scientists earlier understood that some of these harmful white blood cells were eliminated in the immune organ—the site where white blood cells develop.

This year's award recognizes the discovery of T-reg cells—known as the immune system's "security guards"—which patrol the body to neutralize any immune cells that attack the healthy cells.

It is known that this process fails in self-attack conditions such as juvenile diabetes, multiple sclerosis, and rheumatoid arthritis.

A Nobel panel stated, "The findings have established a new field of investigation and accelerated the development of new treatments, for instance for cancer and immune disorders."

In malignancies, T-regs prevent the system from fighting the tumor, so studies are focused on lowering their numbers.

For self-attack disorders, experiments are exploring boosting T-reg cells so the organism is not under attack. A comparable method could also be useful in minimizing the chances of organ transplant failure.

Innovative Studies

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

He showed that injecting defense cells from healthy animals could prevent the disease—implying there was a system for blocking defenders from attacking the body.

Mary Brunkow, from the Institute for Systems Biology in a US city, and Dr. Ramsdell, currently at Sonoma Biotherapeutics in a California city, were investigating an inherited immune disorder in rodents and humans that resulted in the discovery of a genetic factor critical for the way T-regs function.

"The groundbreaking work has revealed how the immune system is kept in check by T-reg cells, preventing it from accidentally targeting the body's own tissues," commented a leading physiology expert.

"The research is a striking example of how basic biological research can have far-reaching consequences for public health."