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The Nobel Prize in Physiology or Medicine was granted for revolutionary findings that clarify how the immune system attacks harmful pathogens while sparing the healthy tissues.

Three renowned scientists—from Japan Shimon Sakaguchi and US scientists Dr. Brunkow and Dr. Ramsdell—share this accolade.

The work identified unique "sentinels" within the defense system that eliminate rogue immune cells capable of attacking the organism.

The discoveries are now enabling innovative treatments for autoimmune diseases and malignancies.

The laureates will divide a prize fund valued at 11 million SEK.

Crucial Discoveries

"The research has been essential for comprehending how the immune system operates and the reason we do not all suffer from severe autoimmune diseases," stated the head of the award panel.

This trio's studies address a core mystery: In what way does the defense system defend us from numerous infections while keeping our healthy cells unharmed?

Our body's protection system employs immune cells that search for signs of disease, even pathogens and bacteria it has not met before.

These defenders employ detectors—known as recognition units—that are generated by chance in countless combinations.

That provides the immune system the ability to combat a wide array of threats, but the unpredictability of the mechanism inevitably creates immune cells that may target the body.

Protectors of the Body

Researchers previously understood that some of these harmful white blood cells were eliminated in the thymus—where white blood cells mature.

The latest award honors the identification of T-reg cells—known as the immune system's "security guards"—which patrol the body to disarm any defenders that assault the healthy cells.

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

A Nobel panel added, "These findings have laid the foundation for a novel area of research and accelerated the creation of new treatments, for instance for cancer and immune disorders."

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

In autoimmune diseases, trials are testing boosting T-reg cells so the body is not under attack. A comparable method could also be effective in minimizing the chances of organ transplant rejection.

Innovative Experiments

Professor Sakaguchi, from a Japanese institution, conducted tests on mice that had their thymus removed, causing self-attack conditions.

The researcher demonstrated that injecting immune cells from other animals could stop the disease—implying there was a mechanism for blocking immune cells from attacking the body.

Mary Brunkow, affiliated with the Institute for Systems Biology in a US city, and Fred Ramsdell, now at a biotech firm in a California city, were studying an genetic immune disorder in mice and people that led to the discovery of a genetic factor critical for how T-regs operate.

"Their groundbreaking work has revealed how the body's defenses is kept in check by T-reg cells, stopping it from accidentally attacking the body's own tissues," commented a leading biological science specialist.

"This work is a remarkable illustration of how basic physiological research can have broad implications for human health."