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The prestigious award in medical science has been granted for transformative discoveries that illuminate how the immune system attacks dangerous pathogens while protecting the body's own cells.

A trio of renowned researchers—Japan's Prof. Sakaguchi and American experts Mary Brunkow and Fred Ramsdell—share this honor.

The work identified specialized "sentinels" within the defense system that remove rogue immune cells that could attacking the body.

These findings are now enabling innovative treatments for immune disorders and malignancies.

These laureates will share a prize fund worth 11m Swedish kronor.

Crucial Discoveries

"The research has been essential for comprehending how the immune system functions and why we don't all develop serious self-attack conditions," commented the chair of the Nobel Committee.

The team's studies explain a fundamental mystery: In what way does the immune system protect us from countless infections while leaving our healthy cells intact?

The immune system employs white blood cells that search for indicators of infection, including viruses and bacteria it has never encountered.

Such cells utilize sensors—called recognition units—that are generated randomly in a vast number of combinations.

That provides the immune system the ability to combat a broad range of invaders, but the unpredictability of the process unavoidably produces immune cells that can attack the host.

Protectors of the Immune System

Scientists earlier understood that some of these harmful white blood cells were eliminated in the thymus—where immune cells develop.

The latest Nobel Prize recognizes the identification of T-reg cells—described as the body's "security guards"—which travel through the body to disarm any defenders that attack the healthy cells.

We know that this process malfunctions in autoimmune diseases such as type-1 diabetes, multiple sclerosis, and RA.

The prize committee added, "The discoveries have laid the foundation for a new field of research and spurred the creation of new treatments, for instance for tumors and autoimmune diseases."

Regarding malignancies, regulatory T-cells prevent the system from fighting the growth, so research are aimed at reducing their numbers.

In self-attack disorders, experiments are exploring boosting regulatory T-cells so the organism is not being harmed. A comparable approach could also be useful in reducing the chances of transplanted organ rejection.

Innovative Experiments

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

He showed that introducing immune cells from healthy animals could stop the disease—implying there was a mechanism for blocking defenders from harming the body.

Mary Brunkow, from the a research center in a US city, and Fred Ramsdell, currently at a biotech firm in a California city, were investigating an inherited immune disorder in rodents and humans that led to the identification of a genetic factor vital for how regulatory T-cells operate.

"The pioneering work has revealed how the body's defenses is kept in check by T-reg cells, stopping it from accidentally targeting the body's own tissues," said a leading physiology specialist.

"This research is a striking example of how basic physiological research can have far-reaching implications for human health."