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The prestigious award in Physiology or Medicine was granted for transformative findings that illuminate how the immune system targets harmful pathogens while protecting the healthy tissues.

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

The work identified unique "security guards" within the defense system that eliminate malfunctioning defense cells that could attacking the organism.

The discoveries are now paving the way for innovative therapies for autoimmune diseases and malignancies.

These laureates will divide a prize fund valued at 11m Swedish kronor.

Decisive Discoveries

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

This trio's studies address a core question: In what way does the defense system protect us from countless invaders while leaving our healthy cells unharmed?

The body's protection system employs immune cells that search for signs of disease, even viruses and germs it has never encountered.

These cells employ sensors—known as receptors—that are produced randomly 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 process unavoidably produces immune cells that may attack the body.

Protectors of the Immune System

Researchers previously understood that some of these problematic white blood cells were eliminated in the immune organ—the site where white blood cells develop.

The latest Nobel Prize honors the discovery of T-reg cells—described as the body's "security guards"—which patrol the body to disarm other defenders that attack the body's own tissues.

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

A Nobel panel added, "These findings have laid the foundation for a new field of research and accelerated the creation of new therapies, for instance for cancer and autoimmune diseases."

Regarding malignancies, regulatory T-cells prevent the body from attacking the growth, so studies are focused on lowering their numbers.

In autoimmune diseases, experiments are testing boosting regulatory T-cells so the body is not under attack. A similar approach could also be useful in minimizing the risks of organ transplant rejection.

Pioneering Studies

Prof Sakaguchi, of Osaka University, conducted tests on rodents that had their immune gland removed, causing autoimmune disease.

He demonstrated that introducing immune cells from other mice could stop the illness—suggesting there was a mechanism for preventing defenders from attacking the body.

Mary Brunkow, affiliated with the Institute for Systems Biology in Seattle, and Dr. Ramsdell, currently at a biotech firm in a California city, were studying an inherited autoimmune disease in mice and people that resulted in the discovery of a genetic factor vital for how T-regs function.

"Their groundbreaking work has uncovered how the body's defenses is kept in check by T-reg cells, preventing it from mistakenly targeting the healthy cells," commented a prominent biological science expert.

"The research is a striking illustration of how basic biological research can have far-reaching consequences for human health."