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This year's prestigious award in Physiology or Medicine has been granted for transformative discoveries that clarify how the immune system attacks dangerous pathogens while sparing the healthy tissues.

A trio of renowned scientists—from Japan Shimon Sakaguchi and American experts Dr. Brunkow and Fred Ramsdell—received this honor.

Their research identified unique "security guards" within the immune system that remove rogue immune cells capable of attacking the body.

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

These winners will share a monetary award worth 11 million SEK.

Crucial Discoveries

"Their research has been decisive for understanding how the body's defenses functions and the reason we don't all suffer from severe autoimmune diseases," stated the head of the Nobel Committee.

This trio's research address a fundamental mystery: How does the defense system defend us from numerous invaders while keeping our healthy cells intact?

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

These cells utilize sensors—known as recognition units—that are generated by chance in countless combinations.

That provides the immune system the capacity to fight a wide array of invaders, but the unpredictability of the process unavoidably creates white blood cells that can target the body.

Security Guards of the Immune System

Scientists previously understood that some of these harmful white blood cells were eliminated in the thymus—where white blood cells develop.

This year's Nobel Prize honors the discovery of T-reg cells—known as the immune system's "peacekeepers"—which travel through the body to disarm other defenders that assault the healthy cells.

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

A prize committee added, "The discoveries have established a new field of investigation and accelerated the creation of new treatments, for example for tumors and immune disorders."

In cancer, regulatory T-cells block the body from attacking the tumor, so research are aimed at reducing their quantity.

In autoimmune diseases, trials are exploring increasing regulatory T-cells so the organism is no longer under attack. A comparable method could also be useful in reducing the chances of transplanted organ rejection.

Innovative Experiments

Prof Sakaguchi, from Osaka University, performed experiments on mice that had their thymus removed, leading to autoimmune disease.

The researcher demonstrated that injecting defense cells from other animals could prevent the disease—implying there was a mechanism for blocking defenders from harming the body.

Mary Brunkow, from the a research center in a US city, and Dr. Ramsdell, currently at a biotech firm in a California city, were studying an inherited immune disorder in mice and humans that resulted in the discovery of a gene vital for how regulatory T-cells operate.

"The pioneering work has revealed how the body's defenses is kept in check by T-reg cells, stopping it from mistakenly targeting the healthy cells," said a prominent biological science specialist.

"The work is a striking example of how fundamental physiological research can have broad implications for human health."