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This year's Nobel Prize in Physiology or Medicine has been awarded for transformative findings that clarify how the body's defense network attacks dangerous infections while sparing the healthy tissues.

Three esteemed scientists—from Japan Prof. Sakaguchi and American experts Mary Brunkow and Fred Ramsdell—received this honor.

The research identified specialized "sentinels" within the immune system that eliminate malfunctioning immune cells that could attacking the body.

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

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

Crucial Discoveries

"The research has been decisive for comprehending how the body's defenses functions and why we don't all develop serious autoimmune diseases," stated the head of the award panel.

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

Our immune system employs immune cells that search for signs of infection, even pathogens and bacteria it has never encountered.

Such cells utilize detectors—known as recognition units—that are generated randomly in countless combinations.

This provides the immune system the ability to combat a broad range of invaders, but the randomness of the mechanism unavoidably produces white blood cells that can attack the host.

Protectors of the Body

Researchers earlier understood that a portion of these problematic white blood cells were destroyed in the immune organ—the site where white blood cells develop.

This year's Nobel Prize recognizes the discovery of regulatory T-cells—described as the immune system's "security guards"—which patrol the body to neutralize other defenders that attack the body's own tissues.

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

The prize committee added, "The discoveries have laid the foundation for a novel area of investigation and accelerated the development of innovative treatments, for instance for tumors and immune disorders."

Regarding cancer, T-regs prevent the body from fighting the tumor, so studies are aimed at lowering their numbers.

In self-attack disorders, trials are testing boosting T-reg cells so the organism is not under attack. A comparable approach could also be effective in minimizing the chances of transplanted organ failure.

Pioneering Studies

Professor Sakaguchi, of a Japanese institution, conducted experiments on rodents that had their immune gland removed, leading to autoimmune disease.

The researcher showed that injecting defense cells from healthy mice could prevent the illness—implying there was a mechanism for blocking defenders from attacking the host.

Mary Brunkow, from the a research center in Seattle, and Fred Ramsdell, now at a biotech firm in San Francisco, were investigating an genetic autoimmune disease in rodents and people that resulted in the identification of a genetic factor critical for the way regulatory T-cells operate.

"Their pioneering research has uncovered how the body's defenses is kept in check by T-reg cells, preventing it from accidentally targeting the body's own tissues," commented a leading physiology specialist.

"The work is a striking illustration of how basic physiological research can have broad consequences for human health."