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The prestigious award in medical science has been awarded for revolutionary findings that illuminate how the body's defense network targets dangerous pathogens while protecting the body's own cells.

Three renowned scientists—Japan's Shimon Sakaguchi and US experts Dr. Brunkow and Dr. Ramsdell—share this accolade.

Their research uncovered specialized "security guards" within the immune system that eliminate rogue defense cells capable of attacking the body.

The discoveries are now paving the way for innovative therapies for autoimmune diseases and cancer.

These winners will share a prize fund worth 11 million Swedish kronor.

Crucial Findings

"The research has been decisive for comprehending how the body's defenses functions and the reason we don't all develop serious autoimmune diseases," stated the chair of the Nobel Committee.

This team's studies explain a fundamental mystery: How does the defense system defend us from numerous infections while keeping our healthy cells intact?

Our immune system uses white blood cells that search for signs of infection, even viruses and germs it has never encountered.

These cells utilize sensors—called receptors—that are generated by chance in a vast number of combinations.

This gives the immune system the capacity to fight a broad range of invaders, but the randomness of the process unavoidably creates white blood cells that can target the body.

Protectors of the Immune System

Researchers earlier understood that a portion of these harmful white blood cells were eliminated in the thymus—where white blood cells develop.

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

It is known that this mechanism malfunctions in autoimmune diseases such as juvenile diabetes, MS, and rheumatoid arthritis.

A Nobel panel added, "These discoveries have established a new field of research and accelerated the development of innovative treatments, for instance for tumors and autoimmune diseases."

In malignancies, T-regs prevent the system from fighting the growth, so research are aimed at reducing their quantity.

In autoimmune diseases, experiments are testing increasing regulatory T-cells so the body is no longer being harmed. A similar approach could also be useful in minimizing the risks of transplanted organ rejection.

Innovative Studies

Professor Sakaguchi, of Osaka University, conducted tests on mice that had their immune gland removed, leading to autoimmune disease.

The researcher showed that introducing immune cells from other animals could stop the disease—suggesting there was a system for preventing immune cells from harming the body.

Dr. Brunkow, from the Institute for Systems Biology in a US city, and Dr. Ramsdell, now at a biotech firm in San Francisco, were studying an genetic autoimmune disease in rodents and people that resulted in the identification of a genetic factor critical for how T-regs operate.

"Their groundbreaking research has revealed how the immune system is kept in check by T-reg cells, preventing it from accidentally targeting the healthy cells," said a prominent physiology expert.

"The research is a remarkable example of how fundamental physiological study can have far-reaching consequences for human health."