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This year's prestigious award in Physiology or Medicine was granted for revolutionary findings that illuminate how the body's defense network targets harmful pathogens while protecting the healthy tissues.

Three esteemed researchers—Japan's Shimon Sakaguchi and US scientists Mary Brunkow and Dr. Ramsdell—share this honor.

Their research identified specialized "security guards" within the defense system that remove malfunctioning defense cells capable of attacking the body.

These discoveries are now enabling innovative therapies for autoimmune diseases and cancer.

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

Decisive Discoveries

"Their research has been essential for comprehending how the immune system functions and the reason we do not all develop serious self-attack conditions," commented the chair of the award panel.

The team's studies address a fundamental question: How does the immune system defend us from numerous infections while leaving our own tissues unharmed?

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

These defenders employ sensors—called recognition units—that are produced randomly in countless variations.

That provides the defense network the capacity to combat a broad range of threats, but the randomness of the mechanism inevitably produces white blood cells that may target the host.

Security Guards of the Body

Researchers previously knew that a portion of these harmful white blood cells were eliminated in the immune organ—the site where immune cells mature.

The latest Nobel Prize recognizes the identification of regulatory T-cells—known as the immune system's "security guards"—which travel through the body to neutralize other defenders that attack the healthy cells.

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

The prize committee stated, "These discoveries have laid the foundation for a new field of investigation and accelerated the development of new therapies, for instance for cancer and autoimmune diseases."

Regarding malignancies, regulatory T-cells prevent the body from attacking the growth, so studies are aimed at reducing their quantity.

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

Pioneering Experiments

Prof Shimon Sakaguchi, from Osaka University, conducted experiments on mice that had their thymus removed, causing self-attack conditions.

The researcher showed that injecting defense cells from healthy mice could stop the illness—implying there was a mechanism for blocking immune cells from harming the body.

Dr. Brunkow, from the Institute for Systems Biology in Seattle, and Fred Ramsdell, currently at Sonoma Biotherapeutics in a California city, were studying an inherited autoimmune disease in mice and people that led to the discovery of a gene vital for the way T-regs operate.

"The pioneering work has revealed how the immune system is kept in check by regulatory T cells, preventing it from accidentally attacking the body's own tissues," commented a leading physiology specialist.

"The research is a remarkable example of how fundamental biological study can have broad implications for public health."