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The prestigious award in medical science was awarded for revolutionary findings that clarify how the body's defense network targets harmful infections while protecting the body's own cells.

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

The research identified unique "sentinels" within the immune system that remove rogue immune cells that could attacking the organism.

The findings are now paving the way for innovative therapies for immune disorders and malignancies.

The winners will share a monetary award valued at 11 million Swedish kronor.

Decisive Discoveries

"The work has been essential for comprehending how the body's defenses functions and the reason we don't all suffer from serious autoimmune diseases," stated the head of the award panel.

This trio's research address a core mystery: How does the immune system defend us from countless infections while keeping our own tissues unharmed?

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

Such cells employ detectors—called receptors—that are generated randomly in countless variations.

That gives the defense network the ability to fight a broad range of threats, but the randomness of the mechanism unavoidably creates immune cells that may target the host.

Protectors of the Body

Researchers earlier knew that a portion of these harmful defense cells were eliminated in the immune organ—the site where white blood cells develop.

This year's award honors the identification of regulatory T-cells—known as the immune system's "security guards"—which patrol the body to disarm other defenders that assault the body's own tissues.

It is known that this mechanism malfunctions in autoimmune diseases such as type-1 diabetes, multiple sclerosis, and RA.

The prize committee stated, "The discoveries have established a novel area of research and spurred the development of new therapies, for instance for tumors and autoimmune diseases."

In malignancies, T-regs prevent the system from fighting the growth, so studies are aimed at lowering their numbers.

For autoimmune diseases, trials are testing increasing T-reg cells so the body is not being harmed. A comparable method could also be effective in minimizing the chances of organ transplant rejection.

Pioneering Experiments

Professor Sakaguchi, from Osaka University, conducted experiments on mice that had their thymus extracted, causing self-attack conditions.

He showed that introducing defense cells from other mice could stop the illness—suggesting there was a mechanism for blocking immune cells from attacking the body.

Dr. Brunkow, from the Institute for Systems Biology in a US city, and Dr. Ramsdell, currently at Sonoma Biotherapeutics in a California city, were studying an genetic immune disorder in rodents and humans that led to the discovery of a genetic factor vital for the way T-regs operate.

"The pioneering research has uncovered how the immune system is kept in check by regulatory T cells, preventing it from accidentally targeting the healthy cells," commented a leading physiology specialist.

"This research is a striking example of how basic physiological research can have broad consequences for public health."