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This year's Nobel Prize in Physiology or Medicine was granted for transformative discoveries that illuminate how the immune system attacks dangerous infections while sparing the body's own cells.

A trio of esteemed researchers—Japan's Prof. Sakaguchi and American experts Mary Brunkow and Dr. Ramsdell—received this honor.

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

The findings are now enabling new therapies for immune disorders and cancer.

These laureates will share a monetary award valued at 11m SEK.

Crucial Discoveries

"Their work has been decisive for comprehending how the body's defenses functions and why we don't all suffer from serious self-attack conditions," stated the head of the award panel.

The team's research explain a core question: How does the defense system protect us from numerous infections while keeping our healthy cells intact?

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

These cells employ detectors—known as receptors—that are produced by chance in countless variations.

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

Security Guards of the Immune System

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

The latest award recognizes the identification of regulatory T-cells—described as the body's "security guards"—which patrol the body to neutralize any immune cells that attack the healthy cells.

We know that this process malfunctions in self-attack conditions such as juvenile diabetes, multiple sclerosis, and rheumatoid arthritis.

The prize committee added, "These discoveries have established a novel area of investigation and spurred the creation of new treatments, for example for cancer and autoimmune diseases."

Regarding cancer, regulatory T-cells block the system from attacking the growth, so research are focused on reducing their numbers.

For autoimmune diseases, experiments are testing boosting regulatory T-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 Experiments

Prof Sakaguchi, of Osaka University, performed experiments on rodents that had their immune gland extracted, causing self-attack conditions.

The researcher showed that introducing defense cells from other animals could stop the illness—implying there was a mechanism for preventing immune cells from harming the body.

Dr. Brunkow, from the Institute for Systems Biology in a US city, and Fred Ramsdell, now at Sonoma Biotherapeutics in a California city, were investigating an inherited immune disorder in mice and humans that resulted in the discovery of a gene vital for the way regulatory T-cells operate.

"Their pioneering work has revealed how the body's defenses is kept in check by regulatory T cells, preventing it from mistakenly targeting the body's own tissues," said a leading physiology specialist.

"This work is a remarkable example of how basic biological study can have far-reaching implications for public health."