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This year's Nobel Prize in Physiology or Medicine has been granted for transformative discoveries that clarify how the body's defense network targets harmful pathogens while protecting the healthy tissues.

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

Their work identified specialized "sentinels" within the immune system that eliminate malfunctioning defense cells capable of attacking the organism.

These findings are now enabling innovative therapies for autoimmune diseases and malignancies.

The laureates will divide a monetary award valued at 11m Swedish kronor.

Decisive Findings

"The research has been essential for comprehending how the immune system functions and why we do not all develop severe autoimmune diseases," stated the head of the award panel.

This team's research address a core mystery: How does the immune system protect us from numerous infections while keeping our healthy cells intact?

Our immune system employs immune cells that scan for indicators of infection, even viruses and germs it has never encountered.

These cells employ detectors—called receptors—that are produced by chance in a vast number of variations.

This provides the defense network the ability to combat a broad range of threats, but the randomness of the mechanism inevitably produces immune cells that can target the body.

Security Guards of the Body

Scientists earlier 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 regulatory T-cells—known as the immune system's "peacekeepers"—which travel through the body to neutralize other defenders that attack the body's own tissues.

We know that this process malfunctions in autoimmune diseases such as juvenile diabetes, MS, and rheumatoid arthritis.

The Nobel panel added, "The discoveries have laid the foundation for a novel area of investigation and spurred the creation of innovative treatments, for instance for tumors and autoimmune diseases."

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

In autoimmune diseases, experiments are exploring boosting T-reg cells so the body is no longer under attack. A comparable method could also be useful in reducing the chances of organ transplant failure.

Innovative Studies

Professor Sakaguchi, from Osaka University, performed tests on mice that had their thymus removed, causing self-attack conditions.

He showed that introducing immune cells from healthy animals could stop the disease—implying there was a mechanism for blocking 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 genetic immune disorder in rodents and people that led to the discovery of a genetic factor critical for the way regulatory T-cells function.

"The groundbreaking research has uncovered how the body's defenses is controlled by regulatory T cells, preventing it from accidentally attacking the healthy cells," said a prominent physiology expert.

"This work is a striking illustration of how fundamental physiological research can have far-reaching implications for human health."