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The prestigious award in medical science has been granted for transformative findings that clarify how the immune system targets dangerous infections while sparing the body's own cells.

Three renowned researchers—Japan's Prof. Sakaguchi and American experts Dr. Brunkow and Dr. Ramsdell—share this honor.

The work identified specialized "security guards" within the defense system that remove rogue immune cells that could harming the body.

These findings are now paving the way for new treatments for immune disorders and malignancies.

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

Decisive Findings

"Their research has been decisive for understanding how the body's defenses operates and why we do not all develop severe autoimmune diseases," commented the chair of the Nobel Committee.

The team's studies address a core question: In what way does the defense system protect us from numerous infections while keeping our own tissues intact?

Our immune system employs immune cells that scan for indicators of infection, even viruses and bacteria it has not met before.

Such defenders employ sensors—known as recognition units—that are produced by chance in a vast number of combinations.

This provides the defense network the ability to combat a wide array of invaders, but the randomness of the mechanism unavoidably creates immune cells that can attack the body.

Protectors of the Immune System

Scientists previously understood that a portion of these harmful white blood cells were eliminated in the immune organ—the site where white blood cells develop.

This year's award recognizes the discovery of regulatory T-cells—described as the body's "security guards"—which patrol the system to disarm other immune cells that attack the healthy cells.

It is known that this mechanism malfunctions in autoimmune diseases such as type-1 diabetes, MS, and rheumatoid arthritis.

The prize committee stated, "These discoveries have established a novel area of investigation and spurred the development of new treatments, for instance for cancer and immune disorders."

In malignancies, T-regs block the body from fighting the tumor, so research are focused on reducing their numbers.

In autoimmune diseases, experiments are exploring boosting T-reg cells so the organism is not being harmed. A similar method could also be useful in minimizing the chances of transplanted organ rejection.

Innovative Experiments

Professor Sakaguchi, from Osaka University, performed tests on rodents that had their immune gland removed, leading to self-attack conditions.

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

Dr. Brunkow, from the a research center in Seattle, and Fred Ramsdell, currently at a biotech firm in a California city, were investigating an genetic autoimmune disease in rodents and people that led to the identification of a genetic factor critical for how regulatory T-cells operate.

"Their pioneering work has uncovered how the immune system is controlled by T-reg cells, stopping it from mistakenly attacking the body's own tissues," commented a prominent biological science specialist.

"The research is a striking example of how basic biological study can have broad implications for human health."