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This year's prestigious award in Physiology or Medicine was awarded for transformative findings that illuminate how the immune system attacks harmful pathogens while protecting the healthy tissues.

Three esteemed researchers—from Japan Prof. Sakaguchi and US experts Mary Brunkow and Dr. Ramsdell—share this honor.

The work uncovered specialized "sentinels" within the defense system that remove rogue defense cells that could attacking the organism.

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

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

Decisive Findings

"The work has been essential for comprehending how the immune system operates and the reason we do not all suffer from serious self-attack conditions," commented the head of the award panel.

The team's studies address a core question: How does the defense system defend us from countless infections while keeping our healthy cells unharmed?

The body's protection system employs immune cells that search for signs of disease, including viruses and bacteria it has never encountered.

These defenders employ detectors—known as recognition units—that are generated randomly in a vast number of combinations.

This gives the immune system the capacity to combat a wide array of invaders, but the randomness of the mechanism inevitably creates white blood cells that may target the body.

Protectors of the Immune System

Scientists previously understood that some of these problematic defense cells were eliminated in the immune organ—the site where white blood cells mature.

This year's Nobel Prize recognizes the identification of regulatory T-cells—known as the immune system's "peacekeepers"—which travel through the system to neutralize any immune cells that assault the healthy cells.

We know that this process fails in self-attack conditions such as type-1 diabetes, MS, and rheumatoid arthritis.

A Nobel panel added, "The findings have established a novel area of investigation and accelerated the development of new treatments, for instance for tumors and immune disorders."

In cancer, regulatory T-cells prevent the system from fighting the tumor, so research are focused on reducing their quantity.

For autoimmune diseases, trials are testing boosting regulatory T-cells so the organism is not being harmed. A similar approach could also be effective in minimizing the chances of organ transplant rejection.

Innovative Experiments

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

He showed that introducing defense cells from healthy mice could stop the disease—implying there was a mechanism for blocking defenders from attacking the host.

Dr. Brunkow, affiliated with the a research center in Seattle, and Dr. Ramsdell, now at Sonoma Biotherapeutics in San Francisco, were studying an inherited autoimmune disease in mice and humans that resulted in the discovery of a gene vital for how regulatory T-cells function.

"The pioneering research has revealed how the body's defenses is controlled by regulatory T cells, preventing it from mistakenly attacking the body's own tissues," said a leading biological science expert.

"This work is a remarkable illustration of how fundamental physiological research can have broad consequences for human health."