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This year's Nobel Prize in Physiology or Medicine has been awarded for revolutionary findings that clarify how the body's defense network targets dangerous pathogens while protecting the body's own cells.

A trio of esteemed scientists—from Japan Prof. Sakaguchi and American scientists Mary Brunkow and Fred Ramsdell—share this honor.

Their work identified specialized "sentinels" within the defense system that eliminate malfunctioning defense cells that could harming the organism.

The discoveries are now paving the way for new treatments for immune disorders and malignancies.

These winners will divide a prize fund valued at 11 million SEK.

Crucial Discoveries

"The research has been essential for comprehending how the immune system operates and the reason we don't all develop severe autoimmune diseases," commented the head of the award panel.

The team's research explain a core mystery: In what way does the immune system protect us from numerous infections while keeping our healthy cells unharmed?

Our body's protection system uses immune cells that search for indicators of infection, even pathogens and germs it has not met before.

These cells utilize detectors—called recognition units—that are generated by chance in countless combinations.

This gives the immune system the capacity to combat a broad range of invaders, but the unpredictability of the process unavoidably produces immune cells that may target the host.

Security Guards of the Body

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

This year's Nobel Prize recognizes the identification of T-reg cells—described as the body's "peacekeepers"—which patrol the system to neutralize other immune cells that attack the body's own tissues.

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

The prize committee stated, "These discoveries have established a new field of research and accelerated the creation of innovative therapies, for instance for cancer and immune disorders."

In malignancies, regulatory T-cells prevent the system from fighting the tumor, so studies are focused on reducing their numbers.

In autoimmune diseases, trials are testing boosting regulatory T-cells so the body is not under attack. A similar approach could also be effective in minimizing the risks of organ transplant rejection.

Pioneering Experiments

Prof Shimon Sakaguchi, of Osaka University, performed experiments on rodents that had their thymus removed, leading to self-attack conditions.

The researcher demonstrated that injecting defense cells from other animals could prevent the illness—suggesting there was a system for preventing immune cells from harming the host.

Mary Brunkow, affiliated with the Institute for Systems Biology in Seattle, and Dr. Ramsdell, now at a biotech firm in San Francisco, were investigating an inherited immune disorder in mice and people that resulted in the identification of a gene critical for how regulatory T-cells operate.

"Their pioneering work has uncovered how the body's defenses is controlled by T-reg cells, stopping it from accidentally targeting the healthy cells," commented a leading physiology specialist.

"This work is a remarkable illustration of how basic physiological study can have broad implications for public health."