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This year's Nobel Prize in medical science has been awarded for revolutionary findings that clarify how the immune system targets dangerous infections while sparing the body's own cells.

A trio of esteemed researchers—from Japan Shimon Sakaguchi and US experts Mary Brunkow and Fred Ramsdell—received this accolade.

Their research identified specialized "sentinels" within the defense system that eliminate rogue defense cells capable of harming the body.

The discoveries are now enabling new therapies for autoimmune diseases and cancer.

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

Crucial Findings

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

This trio's research explain a core question: In what way does the immune system protect us from numerous infections while keeping our healthy cells unharmed?

Our immune system uses immune cells that search for signs of infection, including viruses and bacteria it has never encountered.

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

This gives the immune system the ability to fight a broad range of invaders, but the unpredictability of the mechanism unavoidably creates white blood cells that may target the host.

Protectors of the Body

Scientists earlier knew that a portion of these harmful white blood cells were eliminated in the thymus—where white blood cells mature.

The latest award honors the discovery of T-reg cells—described as the body's "peacekeepers"—which travel through the body to disarm any immune cells that assault the body's own tissues.

We know that this mechanism malfunctions in autoimmune diseases such as juvenile diabetes, multiple sclerosis, and RA.

The prize committee stated, "These findings have established a novel area of research and spurred the creation of new therapies, for instance for cancer and autoimmune diseases."

Regarding cancer, T-regs block the system from fighting the tumor, so research are aimed at lowering their numbers.

In self-attack disorders, experiments are testing boosting T-reg cells so the organism is not under attack. A comparable approach could also be useful in minimizing the chances of organ transplant rejection.

Innovative Experiments

Prof Shimon Sakaguchi, from a Japanese institution, conducted experiments on rodents that had their immune gland removed, causing autoimmune disease.

The researcher demonstrated that introducing immune cells from other mice could prevent the disease—implying there was a mechanism for preventing immune cells from attacking the host.

Dr. Brunkow, affiliated with the Institute for Systems Biology in Seattle, and Dr. Ramsdell, currently at Sonoma Biotherapeutics in San Francisco, were investigating an inherited immune disorder in mice and humans that led to the discovery of a gene critical for the way regulatory T-cells function.

"Their groundbreaking research has revealed how the immune system is kept in check by regulatory T cells, preventing it from accidentally attacking the body's own tissues," said a leading biological science expert.

"This work is a striking example of how fundamental physiological study can have far-reaching implications for public health."