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This year's Nobel Prize in Physiology or Medicine was awarded for revolutionary findings that illuminate how the body's defense network attacks harmful infections while protecting the body's own cells.

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

Their research identified specialized "sentinels" within the defense system that remove rogue defense cells that could harming the body.

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

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

Crucial Discoveries

"Their work has been essential for comprehending how the immune system operates and why we do not all develop severe autoimmune diseases," commented the head of the award panel.

This trio's studies address a core question: How does the defense system defend us from countless infections while leaving our own tissues intact?

Our immune system employs immune cells that search for signs of infection, including viruses and bacteria it has not met before.

These cells employ detectors—called receptors—that are generated randomly in a vast number of combinations.

This provides the defense network the capacity to combat a wide array of threats, but the unpredictability of the mechanism unavoidably produces immune cells that can target the body.

Security Guards of the Body

Scientists previously understood that a portion of these problematic white blood cells were eliminated in the thymus—the site where white blood cells develop.

The latest Nobel Prize honors the discovery of T-reg cells—described as the immune system's "peacekeepers"—which travel through the system to disarm other defenders that assault the healthy cells.

It is known that this mechanism fails in self-attack conditions such as juvenile diabetes, multiple sclerosis, and RA.

A prize committee stated, "The findings have established a novel area of research and accelerated the creation of new treatments, for instance for tumors and autoimmune diseases."

In cancer, T-regs block the system from attacking the growth, so research are focused on reducing their quantity.

In self-attack disorders, trials are exploring increasing T-reg cells so the organism is no longer under attack. A similar method could also be useful in minimizing the risks of transplanted organ rejection.

Innovative Experiments

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

The researcher showed that injecting immune cells from healthy animals could stop the disease—implying there was a system for blocking immune cells from harming the host.

Dr. Brunkow, from the a research center in a US city, and Dr. Ramsdell, currently at Sonoma Biotherapeutics in a California city, were studying an inherited immune disorder in rodents and humans that led to the identification of a genetic factor critical for how regulatory T-cells operate.

"Their pioneering work has revealed how the immune system is kept in check by regulatory T cells, stopping it from mistakenly attacking the healthy cells," commented a leading physiology expert.

"This research is a remarkable example of how basic physiological research can have broad consequences for public health."