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This year's prestigious award in medical science was awarded for transformative discoveries that clarify how the body's defense network targets dangerous pathogens while sparing the body's own cells.

Three esteemed scientists—Japan's Prof. Sakaguchi and US experts Dr. Brunkow and Dr. Ramsdell—share this accolade.

Their work identified unique "sentinels" within the defense system that eliminate malfunctioning immune cells that could attacking the body.

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

These winners will divide a prize fund valued at 11 million SEK.

Decisive Discoveries

"The work has been essential for understanding how the immune system functions and why we do not all develop serious self-attack conditions," commented the head of the Nobel Committee.

The trio's studies explain a fundamental question: How does the immune system protect us from countless invaders while keeping our healthy cells unharmed?

The body's protection system employs immune cells that scan for signs of infection, even viruses and germs it has not met before.

Such defenders utilize detectors—called recognition units—that are generated by chance in countless variations.

That provides the defense network the capacity to combat a broad range of threats, but the randomness of the process unavoidably produces white blood cells that can target the body.

Protectors of the Immune System

Scientists previously knew that a portion of these harmful defense cells were eliminated in the thymus—the site where white blood cells develop.

The latest Nobel Prize honors the discovery of T-reg cells—described as the immune system's "peacekeepers"—which patrol the body to neutralize other defenders that attack the healthy cells.

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

The prize committee added, "The findings have established a novel area of research and accelerated the development of innovative therapies, for instance for tumors and autoimmune diseases."

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

For autoimmune diseases, experiments are testing boosting T-reg cells so the organism is not being harmed. A similar approach could also be effective in reducing the risks of transplanted organ failure.

Innovative Experiments

Professor Sakaguchi, from a Japanese institution, conducted experiments on rodents that had their immune gland extracted, causing autoimmune disease.

The researcher demonstrated that introducing defense cells from other mice could prevent the disease—suggesting there was a mechanism for preventing immune cells from harming the body.

Dr. Brunkow, from the Institute for Systems Biology in Seattle, and Dr. Ramsdell, currently at Sonoma Biotherapeutics in a California city, were studying an genetic immune disorder in rodents and humans that resulted in the identification of a gene vital for the way T-regs function.

"The groundbreaking work has revealed how the immune system is controlled by regulatory T cells, preventing it from accidentally targeting the body's own tissues," commented a leading biological science specialist.

"The research is a striking illustration of how basic biological study can have far-reaching consequences for human health."