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

Three esteemed scientists—from Japan Prof. Sakaguchi and US scientists Mary Brunkow and Dr. Ramsdell—received this honor.

The work uncovered unique "sentinels" within the defense system that eliminate rogue defense cells capable of attacking the organism.

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

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

Decisive Discoveries

"The research has been decisive for comprehending how the body's defenses operates and the reason we do not all suffer from serious autoimmune diseases," commented the head of the award panel.

This team's research address a fundamental mystery: In what way does the defense system protect us from numerous infections while leaving our own tissues intact?

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

These cells utilize detectors—known as recognition units—that are produced randomly in countless combinations.

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

Security Guards of the Body

Researchers earlier knew that some of these problematic defense cells were destroyed in the thymus—the site where white blood cells mature.

This year's Nobel Prize honors the discovery of T-reg cells—described as the body's "security guards"—which patrol the system to disarm other defenders that assault the body's own tissues.

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

A Nobel panel stated, "The findings have laid the foundation for a novel area of investigation and spurred the development of new therapies, for example for tumors and autoimmune diseases."

In cancer, regulatory T-cells prevent the body from fighting the tumor, so research are focused on reducing their numbers.

In autoimmune diseases, trials are testing increasing T-reg cells so the body is no longer under attack. A comparable method could also be effective in minimizing the chances of organ transplant rejection.

Innovative Studies

Prof Sakaguchi, of a Japanese institution, performed tests on mice that had their immune gland removed, causing self-attack conditions.

The researcher showed that introducing defense cells from healthy animals could stop the illness—suggesting there was a system for preventing defenders from attacking the body.

Mary Brunkow, affiliated with the a research center in a US city, and Dr. Ramsdell, now at a biotech firm in San Francisco, were investigating an genetic immune disorder in mice and people that resulted in the discovery of a genetic factor vital for how regulatory T-cells function.

"The groundbreaking work has revealed how the immune system is kept in check by T-reg cells, stopping it from mistakenly targeting the healthy cells," commented a prominent physiology expert.

"The research is a remarkable example of how fundamental biological research can have far-reaching consequences for human health."