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The prestigious award in medical science was granted for revolutionary discoveries that illuminate how the immune system targets dangerous pathogens while protecting the healthy tissues.

Three renowned researchers—Japan's Shimon Sakaguchi and American scientists Dr. Brunkow and Dr. Ramsdell—share this honor.

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

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

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

Crucial Findings

"The work has been decisive for understanding how the body's defenses functions and the reason we do not all develop serious self-attack conditions," stated the head of the Nobel Committee.

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

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

These defenders utilize sensors—called recognition units—that are produced by chance in countless variations.

This provides the immune system the ability to combat a wide array of invaders, but the unpredictability of the process inevitably produces white blood cells that can target the host.

Security Guards of the Body

Researchers earlier understood that some of these problematic white blood cells were destroyed in the immune organ—the site where immune cells mature.

This year's award honors the identification of regulatory T-cells—described as the body's "security guards"—which patrol the body to disarm any immune cells that assault the body's own tissues.

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

The Nobel panel added, "The findings have laid the foundation for a novel area of investigation and accelerated the development of new therapies, for example for tumors and immune disorders."

Regarding cancer, T-regs block the body from attacking the growth, so studies are focused on lowering their numbers.

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

Innovative Experiments

Professor Shimon Sakaguchi, of a Japanese institution, performed experiments on mice that had their thymus removed, causing self-attack conditions.

The researcher demonstrated that introducing defense cells from other animals could prevent the illness—implying there was a system for blocking defenders from harming the host.

Mary Brunkow, affiliated with the Institute for Systems Biology in Seattle, and Dr. Ramsdell, now at Sonoma Biotherapeutics in a California city, were studying an inherited immune disorder in rodents and people that resulted in the discovery of a gene vital for how regulatory T-cells operate.

"The pioneering work has uncovered how the immune system is controlled by T-reg cells, preventing it from mistakenly attacking the body's own tissues," commented a prominent biological science specialist.

"This research is a remarkable illustration of how basic biological study can have far-reaching consequences for public health."