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The prestigious award in medical science was granted for revolutionary findings that clarify how the immune system targets dangerous infections while sparing the healthy tissues.

A trio of esteemed researchers—from Japan Shimon Sakaguchi and US experts Mary Brunkow and Dr. Ramsdell—share this accolade.

Their work identified specialized "sentinels" within the immune system that remove malfunctioning defense cells capable of attacking the organism.

These discoveries are now enabling new treatments for immune disorders and malignancies.

The winners will share a monetary award worth 11 million Swedish kronor.

Decisive Findings

"The research has been essential for understanding how the body's defenses operates and why we do not all develop severe self-attack conditions," stated the head of the award panel.

This team's studies address a core mystery: In what way does the defense system defend us from numerous infections while leaving our own tissues unharmed?

The body's protection system employs white blood cells that search for signs of disease, including pathogens and germs it has not met before.

Such cells employ detectors—called receptors—that are generated by chance in countless combinations.

That provides the defense network the ability to combat a wide array of invaders, but the unpredictability of the process unavoidably produces immune cells that can target the body.

Security Guards of the Immune System

Researchers previously knew that some of these harmful defense cells were eliminated in the thymus—where white blood cells develop.

This year's award honors the discovery of T-reg cells—described as the immune system's "security guards"—which patrol the system to disarm other defenders that attack the healthy cells.

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

The Nobel panel stated, "The discoveries have laid the foundation for a new field of research and spurred the development of innovative therapies, for instance for tumors and immune disorders."

In malignancies, regulatory T-cells block the system from attacking the growth, so research are focused on reducing their numbers.

For self-attack disorders, trials are testing increasing T-reg cells so the organism is not under attack. A similar approach could also be effective in minimizing the risks of organ transplant rejection.

Pioneering Studies

Professor Shimon Sakaguchi, of Osaka University, performed experiments on rodents that had their immune gland removed, leading to autoimmune disease.

The researcher demonstrated that injecting immune cells from other mice could prevent the disease—implying there was a system for preventing immune cells from attacking the body.

Dr. Brunkow, from the a research center in Seattle, and Fred Ramsdell, currently at a biotech firm in a California city, were investigating an inherited immune disorder in mice and people that resulted in the discovery of a genetic factor vital for the way regulatory T-cells function.

"Their pioneering work has revealed how the body's defenses is kept in check by regulatory T cells, stopping it from accidentally targeting the healthy cells," commented a prominent physiology specialist.

"The research is a striking illustration of how fundamental physiological study can have far-reaching implications for human health."