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This year's Nobel Prize in medical science has been awarded for revolutionary discoveries that clarify how the immune system targets harmful infections while sparing the body's own cells.

Three esteemed scientists—Japan's Prof. Sakaguchi and US experts Dr. Brunkow and Dr. Ramsdell—received this accolade.

The work uncovered specialized "sentinels" within the defense system that remove malfunctioning defense cells that could harming the body.

The discoveries are now paving the way for new therapies for immune disorders and cancer.

The laureates will divide a monetary award worth 11 million SEK.

Crucial Findings

"Their research has been decisive for comprehending how the body's defenses functions and the reason we do not all suffer from severe autoimmune diseases," stated the head of the award panel.

This team's research explain a fundamental mystery: In what way does the defense system protect us from countless invaders while leaving our healthy cells unharmed?

Our body's protection system uses white blood cells that search for indicators of infection, including pathogens and germs it has never encountered.

Such cells utilize detectors—called recognition units—that are generated randomly in a vast number of combinations.

This provides the immune system the ability to combat a broad range of threats, but the unpredictability of the mechanism unavoidably produces white blood cells that can attack the body.

Protectors of the Body

Scientists earlier understood that a portion of these problematic defense cells were destroyed in the thymus—the site where white blood cells mature.

The latest award honors the discovery of T-reg cells—described as the immune system's "security guards"—which patrol the system to disarm any defenders that assault the healthy cells.

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

A prize committee stated, "The findings have established a new field of investigation and accelerated the creation of innovative therapies, for instance for tumors and autoimmune diseases."

In cancer, regulatory T-cells block the system from fighting the growth, so research are aimed at lowering their numbers.

For autoimmune diseases, trials are testing boosting T-reg cells so the body is not under attack. A similar approach could also be effective in reducing the risks of transplanted organ rejection.

Innovative Experiments

Professor Sakaguchi, from a Japanese institution, conducted tests on mice that had their thymus extracted, leading to autoimmune disease.

The researcher demonstrated that introducing immune cells from healthy animals could stop the illness—implying there was a mechanism for blocking defenders from harming the body.

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 genetic autoimmune disease in mice and people that resulted in the identification of a gene vital for how regulatory T-cells function.

"The groundbreaking work 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 prominent biological science specialist.

"This work is a striking example of how fundamental biological study can have far-reaching consequences for public health."