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This year's prestigious award in Physiology or Medicine has been awarded for transformative findings that illuminate how the immune system targets dangerous pathogens while protecting the body's own cells.

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

The work uncovered specialized "security guards" within the defense system that eliminate rogue defense cells capable of harming the organism.

These discoveries are now paving the way for new treatments for immune disorders and cancer.

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

Decisive Discoveries

"Their work has been essential for understanding how the immune system operates and why we do not all suffer from serious autoimmune diseases," commented the chair of the Nobel Committee.

This team's studies address a core question: How does the defense system protect us from numerous invaders while keeping our healthy cells unharmed?

The immune system employs white blood cells that search for signs of infection, even viruses and bacteria it has never encountered.

These cells employ detectors—known as receptors—that are generated randomly in countless combinations.

This gives the immune system the ability to combat a wide array of threats, but the unpredictability of the process inevitably produces immune cells that can attack the host.

Protectors of the Immune System

Researchers previously understood that some of these problematic white blood cells were destroyed in the thymus—where white blood cells mature.

This year's Nobel Prize recognizes the discovery of regulatory T-cells—known as the body's "peacekeepers"—which patrol the body to neutralize any defenders that attack the body's own tissues.

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

The prize committee added, "These findings have laid the foundation for a novel area of investigation and spurred the development of innovative therapies, for instance for tumors and immune disorders."

In cancer, T-regs prevent the system from attacking the tumor, so studies are aimed at reducing their quantity.

In autoimmune diseases, trials are exploring boosting regulatory T-cells so the body is no longer being harmed. A comparable method could also be effective in minimizing the risks of transplanted organ rejection.

Innovative Studies

Professor Sakaguchi, of a Japanese institution, performed experiments on rodents that had their thymus removed, causing autoimmune disease.

The researcher showed that introducing immune cells from healthy mice could stop the illness—implying there was a system for preventing defenders from attacking the host.

Mary Brunkow, affiliated with the a research center in Seattle, and Dr. Ramsdell, now at Sonoma Biotherapeutics in a California city, were investigating an genetic autoimmune disease in mice and humans that led to the discovery of a genetic factor critical for how T-regs operate.

"The groundbreaking research has revealed how the immune system is kept in check by T-reg cells, preventing it from mistakenly targeting the healthy cells," said a leading biological science expert.

"This work is a striking illustration of how fundamental biological study can have far-reaching consequences for public health."