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This year's Nobel Prize in medical science was awarded for revolutionary findings that clarify how the body's defense network targets dangerous infections while protecting the body's own cells.

A trio of esteemed researchers—from Japan Shimon Sakaguchi and American scientists Mary Brunkow and Fred Ramsdell—received this accolade.

Their work identified unique "sentinels" within the immune system that remove rogue immune cells capable of attacking the organism.

The findings are now paving the way for innovative therapies for immune disorders and malignancies.

These laureates will divide a monetary award worth 11 million SEK.

Decisive Discoveries

"Their research has been decisive for comprehending how the immune system operates and the reason we do not all develop serious autoimmune diseases," commented the chair of the award panel.

The trio's research address a fundamental question: In what way does the defense system defend us from numerous infections while leaving our own tissues intact?

The body's protection system uses immune cells that scan for indicators of disease, including pathogens and germs it has not met before.

Such defenders employ detectors—called receptors—that are generated randomly in a vast number of combinations.

That gives the defense network the capacity to fight a broad range of invaders, but the unpredictability of the mechanism unavoidably produces immune cells that may attack the host.

Protectors of the Body

Researchers earlier knew that some of these harmful white blood cells were eliminated in the immune organ—where white blood cells mature.

The latest award recognizes the discovery of T-reg cells—known as the body's "peacekeepers"—which travel through the body to disarm any immune cells that assault the healthy cells.

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

A prize committee stated, "These findings have established a novel area of research and accelerated the development of new therapies, for example for tumors and autoimmune diseases."

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

For autoimmune diseases, experiments are testing increasing regulatory T-cells so the organism is no longer being harmed. A similar method could also be useful in reducing the risks of transplanted organ failure.

Pioneering Experiments

Professor Shimon Sakaguchi, from Osaka University, conducted experiments on rodents that had their thymus extracted, causing autoimmune disease.

The researcher demonstrated that injecting defense cells from healthy animals could stop the disease—implying there was a system for preventing defenders from harming the body.

Dr. Brunkow, from the a research center in Seattle, and Fred Ramsdell, currently at Sonoma Biotherapeutics in a California city, were studying an inherited immune disorder in mice and humans that led to the identification of a gene vital for the way T-regs operate.

"Their groundbreaking research has revealed how the body's defenses is controlled by regulatory T cells, preventing it from accidentally attacking the healthy cells," commented a leading biological science expert.

"This research is a remarkable example of how basic biological research can have broad consequences for public health."