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The prestigious award in Physiology or Medicine has been granted for transformative findings that clarify how the body's defense network targets dangerous pathogens while sparing the body's own cells.

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

The research identified specialized "sentinels" within the defense system that remove malfunctioning immune cells that could attacking the organism.

These discoveries are now enabling new treatments for autoimmune diseases and cancer.

The laureates will share a monetary award valued at 11m SEK.

Crucial Findings

"Their work has been essential for comprehending how the body's defenses operates and why we do not all develop severe autoimmune diseases," commented the chair of the Nobel Committee.

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

Our body's protection system uses immune cells that scan for signs of disease, even pathogens and bacteria it has never encountered.

These defenders employ sensors—called receptors—that are generated randomly in a vast number of variations.

That gives the immune system the ability to combat a broad range of invaders, but the unpredictability of the process inevitably produces white blood cells that can target the body.

Security Guards of the Body

Researchers earlier understood that some of these problematic defense cells were destroyed in the immune organ—where immune cells develop.

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

It is known that this mechanism malfunctions in autoimmune diseases such as juvenile diabetes, multiple sclerosis, and rheumatoid arthritis.

The prize committee added, "The discoveries have established a novel area of investigation and accelerated the creation of new therapies, for instance for cancer and immune disorders."

In cancer, regulatory T-cells block the system from fighting the growth, so research are aimed at lowering their numbers.

In autoimmune diseases, trials are exploring boosting regulatory T-cells so the organism is not under attack. A comparable method could also be effective in minimizing the risks of organ transplant failure.

Pioneering Experiments

Professor Sakaguchi, of Osaka University, conducted experiments on mice that had their immune gland removed, causing autoimmune disease.

The researcher demonstrated that introducing defense cells from healthy animals could stop the illness—implying there was a system for blocking defenders from harming the host.

Mary Brunkow, affiliated with the Institute for Systems Biology in a US city, and Dr. Ramsdell, currently at a biotech firm in San Francisco, were studying an inherited autoimmune disease in rodents and people that resulted in the identification of a gene critical for how T-regs operate.

"Their groundbreaking research has revealed how the body's defenses is controlled by T-reg cells, stopping it from accidentally attacking the healthy cells," commented a leading physiology specialist.

"This research is a striking example of how basic biological research can have broad implications for public health."