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This year's prestigious award in medical science was awarded for revolutionary findings that clarify how the body's defense network targets harmful infections while sparing the body's own cells.

A trio of renowned scientists—from Japan Shimon Sakaguchi and American experts Dr. Brunkow and Fred Ramsdell—received this accolade.

The research identified specialized "security guards" within the defense system that eliminate rogue immune cells that could attacking the organism.

The discoveries are now paving the way for new treatments for autoimmune diseases and malignancies.

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

Decisive Findings

"The work has been essential for understanding how the immune system operates and why we do not all develop severe autoimmune diseases," commented the chair of the award panel.

This trio's research explain a fundamental mystery: In what way does the immune system protect us from numerous invaders while leaving our healthy cells intact?

The body's protection system uses immune cells that search for signs of infection, including viruses and bacteria it has never encountered.

These cells employ detectors—known as recognition units—that are produced randomly in a vast number of variations.

This gives the immune system the capacity to combat a wide array of invaders, but the unpredictability of the process unavoidably creates white blood cells that can target the body.

Protectors of the Body

Scientists earlier understood that a portion of these harmful defense cells were destroyed in the thymus—the site where white blood cells develop.

The latest award honors the identification of T-reg cells—known as the body's "peacekeepers"—which patrol the body to neutralize other immune cells that attack the body's own tissues.

It is known that this process fails in autoimmune diseases such as type-1 diabetes, multiple sclerosis, and RA.

The Nobel panel added, "These findings have established a new field of investigation and spurred the creation of innovative therapies, for example for tumors and autoimmune diseases."

In cancer, regulatory T-cells prevent the system from fighting the growth, so studies are aimed at reducing their quantity.

In autoimmune diseases, experiments are testing increasing regulatory T-cells so the organism is no longer under attack. A comparable approach could also be useful in minimizing the risks of organ transplant rejection.

Pioneering Experiments

Prof Sakaguchi, of Osaka University, conducted experiments on mice that had their thymus extracted, leading to autoimmune disease.

He showed that injecting immune cells from other animals could prevent the illness—implying there was a system for blocking defenders from attacking the body.

Dr. Brunkow, affiliated with the Institute for Systems Biology in Seattle, and Dr. Ramsdell, now at a biotech firm in San Francisco, were investigating an inherited autoimmune disease in mice and people that led to the discovery of a gene vital for how regulatory T-cells function.

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

"This work is a remarkable illustration of how basic physiological research can have far-reaching implications for public health."