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

A trio of esteemed researchers—Japan's Shimon Sakaguchi and US scientists Mary Brunkow and Fred Ramsdell—received this honor.

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

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

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

Crucial Findings

"Their work has been decisive for understanding how the body's defenses functions and the reason we don't all suffer from severe self-attack conditions," stated the chair of the Nobel Committee.

This trio's studies explain a fundamental mystery: In what way does the immune system protect us from numerous infections while leaving our own tissues intact?

The immune system uses white blood cells that scan for signs of disease, including pathogens and bacteria it has not met before.

Such cells employ detectors—known as recognition units—that are generated by chance in a vast number of combinations.

That gives the immune system the ability to fight a broad range of invaders, but the randomness of the mechanism inevitably produces immune cells that can attack the body.

Security Guards of the Immune System

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

This year's Nobel Prize recognizes the discovery of regulatory T-cells—described as the body's "security guards"—which patrol the body to disarm any immune cells that assault the body's own tissues.

We know that this mechanism malfunctions in self-attack conditions such as type-1 diabetes, multiple sclerosis, and RA.

The prize committee added, "The findings have laid the foundation for a new field of research and accelerated the creation of new treatments, for instance for cancer and autoimmune diseases."

Regarding malignancies, T-regs prevent the system from fighting the tumor, so studies are aimed at lowering their quantity.

For self-attack disorders, experiments are testing increasing regulatory T-cells so the organism is not under attack. A similar approach could also be effective in reducing the chances of transplanted organ rejection.

Pioneering Experiments

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

He showed that introducing defense cells from healthy animals could stop the illness—suggesting there was a system for blocking immune cells from attacking the body.

Dr. Brunkow, affiliated with the a research center in a US city, and Dr. Ramsdell, now at Sonoma Biotherapeutics in a California city, were investigating an inherited immune disorder in mice and humans that resulted in the identification of a gene critical for how T-regs operate.

"The pioneering work has revealed how the immune system is controlled by regulatory T cells, preventing it from accidentally attacking the body's own tissues," said a leading biological science specialist.

"This research is a remarkable illustration of how fundamental physiological research can have far-reaching consequences for human health."