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The prestigious award in medical science was granted for revolutionary discoveries that clarify how the body's defense network attacks dangerous infections while sparing the body's own cells.

A trio of renowned researchers—Japan's Shimon Sakaguchi and American scientists Dr. Brunkow and Fred Ramsdell—share this accolade.

Their work identified unique "security guards" within the immune system that eliminate rogue immune cells capable of attacking the body.

The findings are now paving the way for new treatments for autoimmune diseases and cancer.

These winners will share a prize fund valued at 11m SEK.

Decisive Findings

"The research has been essential for comprehending how the body's defenses operates and why we do not all develop serious autoimmune diseases," commented the chair of the award panel.

This trio's research explain a core mystery: How does the defense system protect us from countless invaders while keeping our healthy cells unharmed?

The immune system uses immune cells that scan for signs of infection, even pathogens and germs it has not met before.

These defenders employ detectors—known as receptors—that are produced by chance in countless variations.

That gives the defense network the ability to combat a broad range of invaders, but the unpredictability of the mechanism unavoidably produces white blood cells that can target the host.

Protectors of the Body

Researchers earlier understood that some of these harmful defense cells were destroyed in the thymus—where white blood cells mature.

The latest award honors the identification of regulatory T-cells—described as the immune system's "peacekeepers"—which patrol the body to disarm other defenders that assault the healthy cells.

We know that this process fails in autoimmune diseases such as juvenile diabetes, multiple sclerosis, and rheumatoid arthritis.

A Nobel panel added, "The discoveries have laid the foundation for a new field of investigation and spurred the creation of new therapies, for example for cancer and immune disorders."

Regarding malignancies, regulatory T-cells prevent the system from attacking the tumor, so research are focused on reducing their quantity.

In self-attack disorders, experiments are testing boosting T-reg cells so the organism is not under attack. A comparable method could also be effective in reducing the risks of organ transplant rejection.

Pioneering Studies

Prof Sakaguchi, from Osaka University, conducted tests on mice that had their immune gland extracted, causing self-attack conditions.

He showed that injecting immune cells from other mice could stop the illness—implying there was a system for blocking immune cells from attacking the host.

Dr. Brunkow, affiliated with the a research center in Seattle, and Dr. Ramsdell, now at a biotech firm in a California city, were investigating an genetic immune disorder in mice and people that led to the discovery of a gene vital for how regulatory T-cells operate.

"Their pioneering work has revealed how the body's defenses is controlled by regulatory T cells, preventing it from mistakenly targeting the body's own tissues," commented a leading biological science expert.

"This work is a striking example of how basic physiological research can have far-reaching consequences for human health."