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The prestigious award in Physiology or Medicine was granted for transformative findings that illuminate how the immune system attacks dangerous infections while sparing the healthy tissues.

A trio of renowned scientists—Japan's Prof. Sakaguchi and US experts Mary Brunkow and Dr. Ramsdell—received this honor.

Their research identified specialized "sentinels" within the immune system that remove malfunctioning immune cells capable of attacking the organism.

These findings are now enabling innovative treatments for autoimmune diseases and malignancies.

The winners will divide a monetary award valued at 11m Swedish kronor.

Decisive Discoveries

"The research has been decisive for comprehending how the immune system operates and why we do not all suffer from serious autoimmune diseases," commented the head of the Nobel Committee.

The team's research address a core mystery: How does the defense system defend us from numerous infections while leaving our healthy cells intact?

Our body's protection system uses immune cells that search for signs of infection, including viruses and germs it has not met before.

These cells utilize detectors—known as receptors—that are produced randomly in countless variations.

That gives the immune system the ability to combat a wide array of threats, but the randomness of the process unavoidably produces immune cells that may 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 white blood cells mature.

This year's Nobel Prize recognizes the identification of T-reg cells—known as the immune system's "peacekeepers"—which travel through the body to neutralize other immune cells that attack the body's own tissues.

It is known that this process malfunctions in self-attack conditions such as type-1 diabetes, multiple sclerosis, and rheumatoid arthritis.

The Nobel panel added, "These findings have laid the foundation for a new field of investigation and spurred the creation of new treatments, for example for cancer and autoimmune diseases."

In cancer, T-regs prevent the system from fighting the tumor, so studies are aimed at lowering their numbers.

In autoimmune diseases, trials are exploring increasing T-reg cells so the body is not being harmed. A comparable approach could also be useful in reducing the chances of transplanted organ failure.

Innovative Experiments

Professor Sakaguchi, of a Japanese institution, performed experiments on rodents that had their thymus removed, leading to autoimmune disease.

The researcher demonstrated that introducing defense cells from other animals could prevent the illness—implying there was a mechanism for blocking immune cells from attacking the host.

Dr. Brunkow, affiliated with the a research center in Seattle, and Fred Ramsdell, currently at a biotech firm in San Francisco, were studying an genetic immune disorder in mice and humans that resulted in the discovery of a gene critical for how regulatory T-cells operate.

"The pioneering work has uncovered how the body's defenses is kept in check by regulatory T cells, preventing it from accidentally targeting the body's own tissues," commented a prominent biological science specialist.

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