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This year's prestigious award in medical science has been granted for revolutionary discoveries that clarify how the immune system targets harmful pathogens while sparing the healthy tissues.

A trio of renowned researchers—Japan's Prof. Sakaguchi and American experts Mary Brunkow and Dr. Ramsdell—share this accolade.

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

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

These winners will share a prize fund worth 11m Swedish kronor.

Crucial Findings

"Their research has been essential for understanding how the body's defenses operates and the reason we don't all develop serious self-attack conditions," stated the chair of the award panel.

The trio's research address a fundamental question: In what way does the immune system protect us from numerous invaders while keeping our healthy cells intact?

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

These defenders employ detectors—known as recognition units—that are produced randomly in countless combinations.

This gives the immune system the capacity to combat a wide array of threats, but the randomness of the process inevitably produces white blood cells that may attack the host.

Security Guards of the Immune System

Researchers earlier knew that a portion of these problematic white blood cells were eliminated in the thymus—where white blood cells mature.

This year's Nobel Prize honors the identification of regulatory T-cells—described as the body's "peacekeepers"—which patrol the system to neutralize any immune cells that assault the body's own tissues.

It is known that this process fails in autoimmune diseases such as juvenile diabetes, multiple sclerosis, and RA.

A Nobel panel stated, "These findings have laid the foundation for a new field of investigation and spurred the development of innovative treatments, for instance for cancer and immune disorders."

In cancer, T-regs block the system from attacking the tumor, so research are aimed at reducing their quantity.

For autoimmune diseases, experiments are exploring boosting T-reg cells so the body is no longer under attack. A similar method could also be effective in minimizing the risks of transplanted organ failure.

Pioneering Experiments

Professor Shimon Sakaguchi, of a Japanese institution, conducted tests on rodents that had their immune gland removed, causing autoimmune disease.

The researcher showed that injecting immune cells from healthy animals could stop the disease—implying there was a mechanism for blocking defenders from harming the host.

Dr. Brunkow, from the Institute for Systems Biology in Seattle, and Dr. Ramsdell, now at a biotech firm in a California city, were studying an inherited autoimmune disease in mice and humans that resulted in the identification of a genetic factor vital for how T-regs operate.

"The groundbreaking work has uncovered how the immune system is kept in check by T-reg cells, preventing it from mistakenly targeting the healthy cells," said a prominent physiology specialist.

"This work is a remarkable example of how fundamental biological research can have far-reaching implications for public health."