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This year's prestigious award in Physiology or Medicine was awarded for revolutionary findings that clarify how the immune system targets dangerous pathogens while sparing the body's own cells.

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

The research uncovered unique "security guards" within the immune system that remove malfunctioning defense cells that could attacking the body.

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

These laureates will share a prize fund valued at 11 million SEK.

Crucial Discoveries

"Their research has been decisive for understanding how the immune system operates and the reason we do not all suffer from severe autoimmune diseases," stated the chair of the award panel.

The trio's research address a fundamental mystery: How does the immune system defend us from countless infections while leaving our healthy cells unharmed?

Our body's protection system employs white blood cells that scan for signs of disease, including viruses and germs it has not met before.

Such cells employ sensors—known as recognition units—that are generated by chance in a vast number of variations.

This gives the immune system the ability to combat a broad range of threats, but the randomness of the process inevitably creates immune cells that may target the host.

Security Guards of the Immune System

Scientists earlier understood that some of these harmful defense cells were eliminated in the immune organ—the site where immune cells develop.

The latest Nobel Prize recognizes the discovery of T-reg cells—known as the body's "security guards"—which patrol the system to neutralize any defenders that attack the healthy cells.

It is known that this mechanism fails in autoimmune diseases such as juvenile diabetes, MS, and rheumatoid arthritis.

The prize committee stated, "The discoveries have laid the foundation for a novel area of research and spurred the development of new therapies, for example for tumors and immune disorders."

In malignancies, T-regs block the system from attacking the tumor, so research are focused on reducing their numbers.

For autoimmune diseases, experiments are exploring boosting regulatory T-cells so the organism is no longer being harmed. A comparable approach could also be useful in reducing the chances of organ transplant failure.

Innovative Studies

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

He demonstrated that introducing defense cells from other mice could prevent the illness—suggesting there was a system for blocking immune cells from attacking the host.

Dr. Brunkow, from the a research center in Seattle, and Dr. Ramsdell, now at a biotech firm in a California city, were studying an inherited autoimmune disease in rodents and humans that resulted in the discovery of a gene vital for the way regulatory T-cells function.

"Their pioneering work has revealed how the immune system is kept in check by T-reg cells, preventing it from accidentally attacking the body's own tissues," commented a prominent physiology expert.

"This work is a striking example of how basic physiological research can have far-reaching consequences for public health."