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The Nobel Prize in medical science was granted for transformative discoveries that illuminate how the immune system targets harmful pathogens while protecting the body's own cells.

A trio of renowned researchers—Japan's Shimon Sakaguchi and American experts Mary Brunkow and Fred Ramsdell—received this accolade.

Their research uncovered unique "sentinels" within the immune system that remove malfunctioning immune cells that could attacking the organism.

The discoveries are now enabling innovative treatments for immune disorders and cancer.

The winners will divide a prize fund worth 11 million Swedish kronor.

Decisive Findings

"Their research has been essential for understanding how the body's defenses functions and the reason we do not all develop serious autoimmune diseases," commented the head of the award panel.

The team's studies address a fundamental mystery: How does the defense system defend us from countless invaders while keeping our healthy cells intact?

Our body's protection system uses immune cells that scan for signs of disease, even pathogens and bacteria it has not met before.

These cells employ detectors—called recognition units—that are generated by chance in a vast number of combinations.

That provides the immune system the ability to fight a wide array of threats, but the unpredictability of the mechanism unavoidably creates white blood cells that may attack the host.

Security Guards of the Immune System

Researchers previously knew that some of these harmful white blood cells were destroyed in the thymus—the site where immune cells develop.

This year's award recognizes the identification of regulatory T-cells—known as the body's "peacekeepers"—which patrol the system to neutralize any defenders that attack the healthy cells.

It is known that this process fails in autoimmune diseases such as type-1 diabetes, MS, and rheumatoid arthritis.

A Nobel panel stated, "These discoveries have established a novel area of investigation and spurred the development of new treatments, for instance for tumors and autoimmune diseases."

In malignancies, regulatory T-cells block the system from attacking the tumor, so studies are aimed at lowering their quantity.

For 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 transplanted organ rejection.

Pioneering Studies

Prof Shimon Sakaguchi, from Osaka University, performed tests on rodents that had their thymus removed, causing autoimmune disease.

He showed that introducing immune cells from healthy animals could prevent the illness—suggesting there was a system for blocking defenders from harming the body.

Mary Brunkow, from the Institute for Systems Biology in Seattle, and Fred Ramsdell, now at Sonoma Biotherapeutics in San Francisco, were investigating an inherited immune disorder in mice and people that resulted in the identification of a gene vital for how T-regs function.

"The groundbreaking research has uncovered how the body's defenses is kept in check by T-reg cells, preventing it from mistakenly targeting the healthy cells," commented a leading physiology specialist.

"The research is a remarkable example of how fundamental physiological study can have far-reaching implications for public health."