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

A trio of esteemed scientists—from Japan Shimon Sakaguchi and American scientists Dr. Brunkow and Fred Ramsdell—share this accolade.

The work uncovered unique "sentinels" within the defense system that eliminate rogue defense cells capable of attacking the organism.

These findings are now paving the way for new therapies for immune disorders and cancer.

These laureates will share a monetary award worth 11m Swedish kronor.

Crucial Findings

"Their research has been essential for understanding how the immune system operates and the reason we do not all suffer from severe self-attack conditions," stated the head of the award panel.

The team's studies address a fundamental question: In what way does the defense system defend us from numerous infections while leaving our healthy cells intact?

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

Such defenders utilize detectors—called receptors—that are generated randomly in countless variations.

That provides the defense network the capacity to combat a broad range of invaders, but the randomness of the mechanism inevitably creates white blood cells that can target the host.

Protectors of the Immune System

Scientists previously knew that a portion of these harmful defense cells were destroyed in the thymus—the site where immune cells mature.

The latest award recognizes the identification of regulatory T-cells—known as the body's "security guards"—which travel through the body to disarm other defenders 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 stated, "The discoveries have laid the foundation for a novel area of investigation and accelerated the creation of innovative treatments, for example for tumors and autoimmune diseases."

Regarding malignancies, regulatory T-cells prevent the system from fighting the tumor, so studies are aimed at reducing their numbers.

In autoimmune diseases, trials are testing boosting regulatory T-cells so the body is no longer under attack. A similar approach could also be useful in minimizing the chances of transplanted organ rejection.

Innovative Studies

Prof Sakaguchi, of a Japanese institution, conducted tests on mice that had their thymus removed, leading to autoimmune disease.

The researcher showed that injecting immune cells from other animals could stop the illness—implying there was a mechanism for preventing defenders from attacking the body.

Dr. Brunkow, affiliated with the Institute for Systems Biology in Seattle, and Fred Ramsdell, now at a biotech firm in San Francisco, were investigating an genetic immune disorder in rodents and people that resulted in the discovery of a genetic factor vital for the way T-regs function.

"Their pioneering research has revealed how the immune system is kept in check by regulatory T cells, preventing it from accidentally targeting the healthy cells," commented a leading physiology expert.

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