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The Nobel Prize in medical science was granted for revolutionary findings that clarify how the immune system targets dangerous pathogens while protecting the body's own cells.

Three renowned researchers—from Japan Shimon Sakaguchi and American experts Dr. Brunkow and Dr. Ramsdell—share this honor.

Their research identified unique "security guards" within the immune system that eliminate malfunctioning immune cells capable of harming the organism.

The findings are now enabling innovative therapies for immune disorders and cancer.

These winners will divide a monetary award valued at 11 million Swedish kronor.

Crucial Findings

"Their work has been decisive for understanding how the body's defenses functions and why we don't all suffer from severe autoimmune diseases," stated the chair of the award panel.

The trio's studies explain a core question: In what way does the immune system defend us from numerous invaders while leaving our own tissues unharmed?

The body's protection system employs white blood cells that scan for signs of infection, even viruses and bacteria it has not met before.

These cells employ sensors—known as receptors—that are generated by chance in a vast number of variations.

This gives the immune system the capacity to fight a broad range of invaders, but the randomness of the process inevitably produces white blood cells that may attack the body.

Security Guards of the Body

Researchers previously understood that a portion of these harmful defense cells were eliminated in the thymus—the site where immune cells mature.

The latest Nobel Prize recognizes the identification of T-reg cells—described as the immune system's "security guards"—which travel through the system to neutralize other defenders that attack the healthy cells.

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

The prize committee stated, "These findings have laid the foundation for a novel area of investigation and spurred the development of innovative therapies, for example for tumors and autoimmune diseases."

Regarding malignancies, regulatory T-cells prevent the body from fighting the tumor, so studies are focused on lowering their quantity.

In autoimmune diseases, experiments are exploring boosting T-reg cells so the body is not under attack. A similar method could also be useful in minimizing the chances of transplanted organ rejection.

Pioneering Experiments

Prof Shimon Sakaguchi, of Osaka University, conducted experiments on rodents that had their immune gland removed, leading to autoimmune disease.

The researcher demonstrated that introducing immune cells from other mice could stop the illness—implying there was a mechanism for blocking defenders from harming the host.

Dr. Brunkow, from the Institute for Systems Biology in Seattle, and Dr. Ramsdell, now at Sonoma Biotherapeutics in a California city, were investigating an inherited immune disorder in mice and humans that led to the identification of a genetic factor vital for the way T-regs function.

"Their pioneering research has revealed how the immune system is controlled by regulatory T cells, stopping it from mistakenly targeting the body's own tissues," said a leading biological science specialist.

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