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The prestigious award in medical science was awarded for transformative discoveries that clarify how the immune system attacks harmful pathogens while sparing the body's own cells.

A trio of esteemed researchers—from Japan Prof. Sakaguchi and American scientists Dr. Brunkow and Dr. Ramsdell—share this honor.

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

The findings are now paving the way for new therapies for immune disorders and cancer.

The laureates will share a monetary award valued at 11m Swedish kronor.

Crucial Findings

"Their work has been essential for comprehending how the body's defenses operates and why we do not all develop severe self-attack conditions," stated the head of the Nobel Committee.

This team's studies explain a fundamental mystery: In what way does the defense system defend us from countless invaders while leaving our healthy cells unharmed?

The body's protection system employs white blood cells that scan for signs of infection, including pathogens and germs it has never encountered.

These cells employ sensors—known as receptors—that are produced by chance in countless combinations.

That gives the defense network the ability to fight a wide array of invaders, but the unpredictability of the process inevitably produces immune cells that can target the host.

Security Guards of the Immune System

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

The latest award recognizes the discovery of regulatory T-cells—described as the immune system's "peacekeepers"—which travel through the body to disarm any defenders that attack the body's own tissues.

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

A Nobel panel added, "These findings have established a novel area of research and spurred the development of innovative treatments, for instance for cancer and autoimmune diseases."

In malignancies, T-regs block the body from fighting the tumor, so research are focused on reducing their numbers.

For autoimmune diseases, experiments are testing boosting regulatory T-cells so the body is not being harmed. A similar approach could also be useful in minimizing the risks of organ transplant rejection.

Pioneering Studies

Professor Shimon Sakaguchi, of Osaka University, performed experiments on mice that had their immune gland removed, causing autoimmune disease.

He showed that injecting immune cells from healthy mice could stop the illness—implying there was a system for blocking immune cells from attacking the host.

Dr. Brunkow, affiliated with the Institute for Systems Biology in Seattle, and Fred Ramsdell, now at Sonoma Biotherapeutics in a California city, were investigating an genetic autoimmune disease in rodents and humans that led to the discovery of a genetic factor vital for the way regulatory T-cells function.

"Their pioneering research has revealed how the immune system is controlled by T-reg cells, stopping it from mistakenly attacking the healthy cells," commented a leading physiology specialist.

"The work is a striking illustration of how basic physiological research can have far-reaching implications for human health."