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This year's Nobel Prize in medical science has been granted for revolutionary discoveries that clarify how the immune system targets dangerous pathogens while protecting the healthy tissues.

Three esteemed researchers—Japan's Prof. Sakaguchi and American experts Dr. Brunkow and Fred Ramsdell—received this honor.

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

The findings are now paving the way for new therapies for autoimmune diseases and cancer.

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

Decisive Discoveries

"Their work has been essential for understanding how the body's defenses functions and the reason we don't all suffer from serious self-attack conditions," commented the head of the award panel.

The trio's research address a fundamental mystery: How does the defense system protect us from countless infections while keeping our healthy cells unharmed?

Our immune system employs immune cells that search for signs of infection, even pathogens and germs it has never encountered.

Such defenders employ sensors—known as receptors—that are produced randomly in countless combinations.

That provides the defense network the capacity to fight a wide array of invaders, but the randomness of the mechanism unavoidably produces white blood cells that can attack the host.

Protectors of the Immune System

Researchers previously knew that a portion of these problematic white blood cells were destroyed in the thymus—the site where white blood cells develop.

This year's award recognizes the identification of T-reg cells—known as the body's "security guards"—which patrol the body to neutralize other defenders that attack the body's own tissues.

We know that this mechanism malfunctions in self-attack conditions such as juvenile diabetes, MS, and RA.

A Nobel panel added, "These discoveries have laid the foundation for a novel area of investigation and spurred the creation of innovative therapies, for instance for tumors and immune disorders."

In cancer, regulatory T-cells prevent the system from attacking the growth, so studies are focused on lowering their numbers.

In autoimmune diseases, trials are testing increasing regulatory T-cells so the organism is not being harmed. A comparable approach could also be effective in minimizing the risks of transplanted organ failure.

Pioneering Experiments

Professor Sakaguchi, of a Japanese institution, conducted tests on rodents that had their immune gland extracted, leading to self-attack conditions.

He showed that introducing immune cells from other mice could stop the illness—suggesting there was a mechanism for blocking defenders from harming the body.

Dr. Brunkow, from the a research center in a US city, 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 discovery of a gene vital for how regulatory T-cells function.

"Their pioneering research has uncovered how the body's defenses is controlled by T-reg cells, preventing it from mistakenly attacking the body's own tissues," commented a leading biological science specialist.

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