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The prestigious award in Physiology or Medicine has been granted for transformative discoveries that clarify how the body's defense network attacks dangerous pathogens while sparing the body's own cells.

A trio of esteemed researchers—Japan's Shimon Sakaguchi and American scientists Mary Brunkow and Dr. Ramsdell—share this accolade.

Their research uncovered unique "security guards" within the defense system that eliminate malfunctioning immune cells that could harming the body.

The discoveries are now enabling innovative treatments for immune disorders and malignancies.

These laureates will divide a prize fund valued at 11m Swedish kronor.

Decisive Discoveries

"Their work has been essential for comprehending how the body's defenses operates and why we don't all develop serious self-attack conditions," stated the head of the award panel.

This trio's studies explain a core mystery: How does the defense system protect us from countless infections while leaving our healthy cells unharmed?

The immune system employs immune cells that scan for indicators of disease, including viruses and germs it has never encountered.

Such cells utilize detectors—called recognition units—that are generated by chance in a vast number of combinations.

That provides the defense network the capacity to fight a broad range of invaders, but the unpredictability of the process inevitably produces immune cells that may attack the host.

Protectors of the Body

Scientists earlier understood that a portion of these problematic white blood cells were eliminated in the thymus—the site where immune cells mature.

This year's award honors the identification of T-reg cells—described as the immune system's "security guards"—which travel through the system to neutralize other defenders that attack the healthy cells.

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

The Nobel panel stated, "The discoveries have laid the foundation for a new field of investigation and accelerated the development of new treatments, for instance for tumors and autoimmune diseases."

Regarding cancer, T-regs block the system from attacking the growth, so studies are focused on reducing their quantity.

For self-attack disorders, trials are testing increasing regulatory T-cells so the organism is not under attack. A similar approach could also be effective in minimizing the chances of transplanted organ failure.

Pioneering Experiments

Prof Sakaguchi, from a Japanese institution, performed experiments on mice that had their immune gland extracted, causing self-attack conditions.

The researcher showed that injecting defense cells from healthy animals could prevent the disease—suggesting there was a mechanism for blocking defenders from attacking the host.

Mary Brunkow, affiliated with the Institute for Systems Biology in Seattle, and Dr. Ramsdell, currently at a biotech firm in San Francisco, were investigating an inherited autoimmune disease in mice and humans that resulted in the discovery of a gene vital for how T-regs operate.

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

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