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The Nobel Prize in Physiology or Medicine was granted for transformative discoveries that illuminate how the body's defense network targets harmful pathogens while protecting the body's own cells.

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

Their research identified specialized "sentinels" within the immune system that remove malfunctioning immune cells capable of attacking the organism.

The findings are now paving the way for new therapies for immune disorders and cancer.

These winners will share a monetary award valued at 11m Swedish kronor.

Decisive Findings

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

The team's research explain a core mystery: How does the defense system protect us from numerous infections while leaving our own tissues intact?

Our immune system uses immune cells that scan for indicators of infection, including viruses and bacteria it has never encountered.

Such defenders utilize sensors—called recognition units—that are produced by chance in a vast number of variations.

That gives the defense network the ability to combat a broad range of threats, but the randomness of the mechanism unavoidably produces white blood cells that may target the body.

Security Guards of the Body

Researchers previously understood that some of these harmful defense cells were destroyed in the thymus—where white blood cells develop.

The latest Nobel Prize honors the discovery of regulatory T-cells—described as the body's "peacekeepers"—which travel through the system to disarm other immune cells that attack the body's own tissues.

It is known that this mechanism malfunctions in self-attack conditions such as juvenile diabetes, MS, and rheumatoid arthritis.

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

In cancer, T-regs block the body from attacking the tumor, so studies are aimed at reducing their numbers.

For autoimmune diseases, experiments are exploring increasing regulatory T-cells so the body is no longer under attack. A comparable approach could also be useful in minimizing the risks of transplanted organ rejection.

Innovative Experiments

Professor Shimon Sakaguchi, from Osaka University, performed tests on mice that had their thymus removed, causing self-attack conditions.

He showed that injecting defense cells from other animals could stop the disease—implying there was a system for preventing defenders from harming the body.

Mary 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 vital for the way T-regs operate.

"The groundbreaking research has uncovered how the body's defenses is controlled by regulatory T cells, preventing it from accidentally targeting the body's own tissues," commented a leading physiology specialist.

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