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This year's prestigious award in Physiology or Medicine has been granted for revolutionary discoveries that illuminate how the immune system targets dangerous infections while protecting the healthy tissues.

Three esteemed researchers—Japan's Prof. Sakaguchi and American experts Mary Brunkow and Dr. Ramsdell—share this accolade.

The work uncovered unique "security guards" within the immune system that eliminate malfunctioning defense cells capable of attacking the organism.

The findings are now paving the way for new treatments for autoimmune diseases and cancer.

These winners will share a monetary award worth 11m SEK.

Crucial Findings

"Their research has been essential for understanding how the immune system operates and the reason we don't all suffer from serious self-attack conditions," stated the head of the award panel.

The team's studies explain a core question: In what way does the immune system protect us from countless invaders while leaving our own tissues intact?

Our body's protection system uses immune cells that scan for indicators of disease, including viruses and bacteria it has never encountered.

These cells employ detectors—known as receptors—that are generated by chance in countless combinations.

That gives the defense network the ability to fight a wide array of threats, but the randomness of the mechanism inevitably produces immune cells that may attack the body.

Security Guards of the Immune System

Scientists previously knew that a portion of these problematic white blood cells were destroyed in the immune organ—the site where immune cells mature.

This year's Nobel Prize honors the identification of T-reg cells—known as the immune system's "security guards"—which travel through the system to disarm any immune cells that attack the healthy cells.

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

The Nobel panel stated, "The discoveries have laid the foundation for a new field of investigation and spurred the creation of new treatments, for example for tumors and immune disorders."

Regarding cancer, regulatory T-cells prevent the body from fighting the tumor, so research are aimed at reducing their quantity.

In self-attack disorders, experiments are exploring boosting T-reg cells so the body is no longer under attack. A comparable approach could also be useful in minimizing the risks of organ transplant failure.

Pioneering Experiments

Professor Shimon Sakaguchi, of Osaka University, conducted tests on mice that had their immune gland extracted, leading to autoimmune disease.

He demonstrated that introducing immune cells from other mice could stop the illness—suggesting there was a mechanism for blocking defenders from attacking the host.

Mary Brunkow, from the a research center in a US city, and Fred Ramsdell, currently at a biotech firm in San Francisco, were studying an inherited autoimmune disease in rodents and humans that led to the discovery of a genetic factor critical for the way T-regs operate.

"Their groundbreaking research has revealed how the immune system is controlled by T-reg cells, stopping it from mistakenly targeting the body's own tissues," said a prominent biological science specialist.

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