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This year's prestigious award in medical science was awarded for transformative findings that illuminate how the body's defense network targets harmful pathogens while sparing the healthy tissues.

Three renowned researchers—from Japan Prof. Sakaguchi and American experts Mary Brunkow and Fred Ramsdell—received this honor.

Their work identified specialized "security guards" within the defense system that eliminate malfunctioning defense cells that could harming the body.

These discoveries are now enabling new therapies for autoimmune diseases and malignancies.

The winners will share a prize fund valued at 11 million SEK.

Decisive Discoveries

"The work has been essential for comprehending how the body's defenses functions and why we do not all suffer from serious autoimmune diseases," stated the head of the Nobel Committee.

This team's research explain a core mystery: How does the defense system defend us from countless infections while leaving our healthy cells intact?

The body's protection system employs immune cells that search for indicators of infection, even pathogens and germs it has never encountered.

Such defenders employ detectors—called receptors—that are produced randomly in a vast number of combinations.

This provides the defense network the ability to combat a wide array of invaders, but the randomness of the process inevitably produces immune cells that may target the body.

Protectors of the Body

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

The latest award recognizes the discovery of T-reg cells—known as the body's "peacekeepers"—which travel through the system to disarm other immune cells that attack the body's own tissues.

We know that this mechanism malfunctions in autoimmune diseases such as juvenile diabetes, MS, and rheumatoid arthritis.

The prize committee added, "These findings have established a new field of investigation and spurred the development of new treatments, for instance for cancer and autoimmune diseases."

Regarding malignancies, regulatory T-cells block the system from fighting the tumor, so research are aimed at reducing their quantity.

For self-attack disorders, experiments are testing increasing T-reg cells so the body is no longer being harmed. A comparable approach could also be effective in reducing the chances of transplanted organ failure.

Innovative Studies

Prof Shimon Sakaguchi, of a Japanese institution, conducted experiments on rodents that had their immune gland removed, leading to self-attack conditions.

He demonstrated that injecting immune cells from healthy animals could stop the illness—implying there was a mechanism for blocking immune cells from attacking the host.

Dr. Brunkow, from the a research center in a US city, and Dr. Ramsdell, now at a biotech firm in a California city, were studying an inherited autoimmune disease in mice and people that led to the discovery of a gene critical for the way T-regs function.

"Their groundbreaking 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.

"This research is a remarkable example of how basic physiological research can have far-reaching implications for public health."