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The Nobel Prize in medical science has been granted for revolutionary findings that clarify how the immune system attacks dangerous infections while protecting the body's own cells.

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

The research uncovered specialized "sentinels" within the defense system that remove malfunctioning immune cells that could attacking the organism.

These findings are now enabling new treatments for autoimmune diseases and cancer.

The laureates will share a prize fund worth 11 million SEK.

Crucial Discoveries

"The work has been decisive for understanding how the body's defenses operates and the reason we don't all develop severe self-attack conditions," commented the head of the award panel.

This team's studies address a core question: How does the defense system protect us from numerous infections while keeping our own tissues unharmed?

The body's protection system employs white blood cells that search for signs of disease, even pathogens and bacteria it has never encountered.

Such defenders employ detectors—called receptors—that are produced randomly in a vast number of combinations.

This gives the defense network the capacity to combat a broad range of threats, but the unpredictability of the process inevitably creates immune cells that can target the body.

Security Guards of the Body

Scientists previously knew that some of these problematic defense cells were destroyed in the immune organ—where immune cells develop.

This year's Nobel Prize honors the identification of T-reg cells—described as the body's "peacekeepers"—which travel through the body to neutralize any defenders that assault the body's own tissues.

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

The prize committee stated, "The findings have laid the foundation for a new field of research and spurred the creation of innovative therapies, for instance for tumors and autoimmune diseases."

In malignancies, regulatory T-cells block the system from attacking the growth, so research are focused on lowering their quantity.

For autoimmune diseases, experiments are testing boosting T-reg cells so the organism is no longer being harmed. A comparable approach could also be useful in reducing the chances of organ transplant failure.

Pioneering Studies

Professor Sakaguchi, of Osaka University, performed tests on mice that had their immune gland extracted, leading to self-attack conditions.

The researcher demonstrated that introducing defense cells from other mice could stop the disease—implying there was a system for preventing defenders from harming the host.

Mary Brunkow, affiliated with the a research center in Seattle, and Fred Ramsdell, currently at a biotech firm in a California city, were investigating an inherited immune disorder in rodents and humans that resulted in the discovery of a gene vital for the way T-regs operate.

"The pioneering research has uncovered how the body's defenses is kept in check by T-reg cells, stopping it from mistakenly attacking the body's own tissues," commented a leading biological science expert.

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