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This year's prestigious award in medical science was awarded for transformative discoveries that clarify how the immune system attacks dangerous infections while protecting the healthy tissues.

Three renowned researchers—from Japan Prof. Sakaguchi and American experts Dr. Brunkow and Fred Ramsdell—share this accolade.

The work uncovered unique "sentinels" within the defense system that eliminate malfunctioning immune cells capable of harming the organism.

These findings are now enabling innovative therapies for autoimmune diseases and malignancies.

The laureates will divide a prize fund valued at 11 million SEK.

Crucial Findings

"The work has been essential for understanding how the immune system functions and the reason we do not all develop serious autoimmune diseases," commented the chair of the Nobel Committee.

The team's research address a fundamental mystery: How does the immune system protect us from countless invaders while leaving our own tissues intact?

Our body's protection system employs immune cells that scan for signs of infection, even pathogens and germs it has never encountered.

These defenders employ sensors—known as recognition units—that are produced randomly in a vast number of combinations.

That gives the defense network the capacity to fight a broad range of threats, but the unpredictability of the process unavoidably creates immune cells that can attack the host.

Protectors of the Body

Researchers earlier understood that some of these harmful white blood cells were eliminated in the thymus—the site where white blood cells mature.

This year's award recognizes the discovery of regulatory T-cells—known as the body's "peacekeepers"—which patrol the body to disarm 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.

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

In cancer, regulatory T-cells prevent the body from attacking the growth, so research are aimed at reducing their numbers.

For self-attack disorders, experiments are testing boosting T-reg cells so the body is not being harmed. A comparable method could also be effective in minimizing the risks of organ transplant failure.

Innovative Studies

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

The researcher showed that introducing immune cells from other animals could prevent the disease—implying there was a system for blocking immune cells from harming the body.

Dr. Brunkow, from the a research center in Seattle, and Dr. Ramsdell, now at Sonoma Biotherapeutics in San Francisco, were investigating an genetic immune disorder in mice and humans that resulted in the identification of a gene vital for how regulatory T-cells operate.

"Their pioneering work has uncovered how the body's defenses is controlled by T-reg cells, preventing it from accidentally targeting the body's own tissues," said a prominent physiology expert.

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