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This year's Nobel Prize in medical science was granted for transformative discoveries that illuminate how the immune system targets harmful pathogens while sparing the healthy tissues.

A trio of esteemed researchers—Japan's Shimon Sakaguchi and US scientists Mary Brunkow and Dr. Ramsdell—share this honor.

Their work identified unique "security guards" within the defense system that eliminate malfunctioning defense cells capable of attacking the body.

These findings are now enabling innovative therapies for autoimmune diseases and cancer.

The winners will divide a monetary award valued at 11 million SEK.

Decisive Discoveries

"Their research has been decisive for comprehending how the immune system operates and why we do not all develop severe self-attack conditions," stated the chair of the Nobel Committee.

The trio's research explain a fundamental question: How does the defense system protect us from numerous invaders while keeping our healthy cells intact?

Our body's protection system employs white blood cells that search for signs of disease, including viruses and bacteria it has never encountered.

Such defenders utilize detectors—called receptors—that are generated by chance in countless combinations.

This provides the immune system the ability to fight a wide array of invaders, but the unpredictability of the process inevitably produces white blood cells that may attack the body.

Protectors of the Immune System

Researchers previously knew that a portion of these problematic defense cells were destroyed in the immune organ—the site where immune cells develop.

This year's award honors the identification of T-reg cells—described as the immune system's "security guards"—which travel through the system to disarm other defenders that assault the healthy cells.

We know that this process fails in self-attack conditions such as juvenile diabetes, multiple sclerosis, and RA.

A Nobel panel added, "The discoveries have established a new field of research and spurred the creation of innovative therapies, for instance for tumors and autoimmune diseases."

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

For autoimmune diseases, experiments are exploring boosting T-reg cells so the body is not being harmed. A similar method could also be useful in reducing the chances of transplanted organ failure.

Innovative Experiments

Prof Shimon Sakaguchi, of Osaka University, conducted experiments on rodents that had their immune gland removed, causing self-attack conditions.

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

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

"Their pioneering work has revealed how the body's defenses is kept in check by T-reg cells, preventing it from accidentally attacking the body's own tissues," said a prominent physiology expert.

"The work is a striking example of how fundamental physiological research can have broad consequences for public health."