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This year's prestigious award in Physiology or Medicine has been granted for transformative discoveries that illuminate how the immune system targets dangerous infections while protecting the healthy tissues.

A trio of esteemed researchers—from Japan Prof. Sakaguchi and US experts Dr. Brunkow and Dr. Ramsdell—received this accolade.

The research identified unique "security guards" within the defense system that eliminate rogue immune cells that could harming the body.

The discoveries are now enabling new treatments for immune disorders and cancer.

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

Crucial Discoveries

"Their work has been decisive for comprehending how the body's defenses operates and why we don't all suffer from serious autoimmune diseases," commented the chair of the award panel.

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

The body's protection system employs white blood cells that search for indicators of disease, even pathogens and germs it has never encountered.

Such cells employ sensors—called receptors—that are generated by chance in countless combinations.

That provides the defense network the capacity to combat a broad range of invaders, but the unpredictability of the mechanism unavoidably produces white blood cells that can attack the host.

Protectors of the Body

Researchers previously knew that some of these problematic defense cells were eliminated in the immune organ—where immune cells develop.

The latest Nobel Prize honors the discovery of regulatory T-cells—described as the immune system's "peacekeepers"—which travel through the system to disarm other defenders that attack the healthy cells.

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

The Nobel panel stated, "The findings have laid the foundation for a new field of investigation and accelerated the creation of new treatments, for example for cancer and immune disorders."

In malignancies, T-regs prevent the body from attacking the growth, so studies are aimed at reducing their numbers.

In autoimmune diseases, experiments are exploring boosting T-reg cells so the body is not being harmed. A comparable method could also be effective in minimizing the risks of transplanted organ failure.

Pioneering Experiments

Prof Shimon Sakaguchi, from Osaka University, conducted experiments on mice that had their immune gland extracted, leading to self-attack conditions.

The researcher demonstrated that injecting immune cells from healthy animals could stop the disease—suggesting there was a system for blocking immune cells from harming the body.

Mary Brunkow, from the Institute for Systems Biology in Seattle, and Fred Ramsdell, now at a biotech firm in San Francisco, were studying an inherited autoimmune disease in mice and humans that resulted in the identification of a genetic factor critical for the way regulatory T-cells function.

"Their groundbreaking work has uncovered how the immune system is controlled by T-reg cells, stopping it from mistakenly attacking the healthy cells," commented a leading physiology expert.

"The work is a remarkable example of how fundamental physiological study can have far-reaching implications for public health."