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The prestigious award in Physiology or Medicine was awarded for transformative discoveries that clarify how the body's defense network attacks harmful infections while sparing the healthy tissues.

A trio of esteemed researchers—Japan's Prof. Sakaguchi and American experts Dr. Brunkow and Dr. Ramsdell—share this accolade.

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

The findings are now enabling innovative therapies for autoimmune diseases and malignancies.

These winners will divide a monetary award valued at 11 million SEK.

Decisive Findings

"Their work has been essential for understanding how the body's defenses functions and the reason we don't all develop severe autoimmune diseases," stated the head of the award panel.

This trio's studies explain a fundamental mystery: In what way does the immune system defend us from numerous infections while keeping our healthy cells intact?

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

These defenders utilize detectors—known as recognition units—that are produced randomly in countless variations.

This provides the defense network the ability to combat a broad range of threats, but the unpredictability of the mechanism inevitably creates white blood cells that can attack the host.

Security Guards of the Body

Scientists previously knew that some of these problematic defense cells were eliminated in the immune organ—the site where white blood cells mature.

The latest award recognizes the identification of regulatory T-cells—described as the immune system's "security guards"—which travel through the system to neutralize other immune cells that attack the body's own tissues.

We know that this process malfunctions in self-attack conditions such as type-1 diabetes, MS, and rheumatoid arthritis.

A prize committee stated, "These findings have laid the foundation for a novel area of investigation and accelerated the creation of innovative treatments, for example for cancer and autoimmune diseases."

Regarding cancer, regulatory T-cells prevent the system from fighting the growth, so studies are focused on reducing their quantity.

In self-attack disorders, trials are exploring increasing T-reg cells so the body is not under attack. A similar method could also be useful in minimizing the risks of organ transplant failure.

Pioneering Experiments

Professor Shimon Sakaguchi, from a Japanese institution, conducted experiments on mice that had their thymus extracted, leading to self-attack conditions.

He demonstrated that injecting immune cells from other animals could prevent the disease—suggesting there was a system for preventing immune cells from attacking the host.

Dr. Brunkow, affiliated with the Institute for Systems Biology in a US city, and Fred Ramsdell, now at a biotech firm in San Francisco, were studying an inherited autoimmune disease in rodents and humans that led to the identification of a gene vital for how T-regs function.

"Their pioneering work has revealed how the immune system is kept in check by T-reg cells, preventing it from accidentally targeting the healthy cells," said a leading physiology expert.

"The research is a remarkable illustration of how basic physiological study can have far-reaching implications for public health."