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The prestigious award in medical science was granted for revolutionary findings that clarify how the immune system targets dangerous pathogens while protecting the healthy tissues.

Three esteemed researchers—Japan's Prof. Sakaguchi and American experts Mary Brunkow and Dr. Ramsdell—share this accolade.

The research identified unique "sentinels" within the defense system that eliminate malfunctioning immune cells capable of harming the organism.

The findings are now paving the way for innovative therapies for autoimmune diseases and malignancies.

The winners will divide a prize fund worth 11 million SEK.

Crucial Discoveries

"The work has been decisive for comprehending how the body's defenses operates and why we don't all suffer from severe self-attack conditions," stated the chair of the Nobel Committee.

This team's research explain a core question: How does the defense system protect us from countless infections while keeping our healthy cells unharmed?

The body's protection system uses immune cells that search for signs of disease, including pathogens and bacteria it has not met before.

Such cells utilize sensors—called receptors—that are produced by chance in a vast number of variations.

This provides the defense network the ability to combat a wide array of threats, but the unpredictability of the process unavoidably produces white blood cells that may attack the body.

Protectors of the Body

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

This year's award recognizes the discovery of regulatory T-cells—known as the body's "peacekeepers"—which travel through the system to disarm any defenders that attack the healthy cells.

It is known that this process fails in self-attack conditions such as type-1 diabetes, MS, and RA.

The Nobel panel added, "These findings have laid the foundation for a new field of research and accelerated the development of new treatments, for example for cancer and immune disorders."

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

In autoimmune diseases, experiments are exploring increasing T-reg cells so the body is not under attack. A comparable approach could also be effective in reducing the chances of transplanted organ rejection.

Innovative Studies

Professor Sakaguchi, from Osaka University, performed tests on mice that had their thymus extracted, causing autoimmune disease.

He demonstrated that injecting immune cells from other animals could prevent the illness—suggesting there was a system for preventing defenders from harming the body.

Dr. Brunkow, from the Institute for Systems Biology in Seattle, and Dr. Ramsdell, now at a biotech firm in San Francisco, were studying an inherited immune disorder in rodents and humans that led to the discovery of a genetic factor vital for how regulatory T-cells operate.

"Their pioneering research has uncovered how the immune system is controlled by T-reg cells, preventing it from mistakenly targeting the healthy cells," said a prominent physiology expert.

"The work is a remarkable example of how basic physiological study can have broad consequences for human health."