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This year's prestigious award in Physiology or Medicine has been granted for transformative findings that illuminate how the immune system targets harmful infections while sparing the body's own cells.

A trio of esteemed researchers—from Japan Shimon Sakaguchi and US scientists Mary Brunkow and Dr. Ramsdell—share this accolade.

Their research identified unique "sentinels" within the immune system that remove malfunctioning immune cells that could attacking the organism.

The discoveries are now enabling new treatments for immune disorders and cancer.

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

Decisive Findings

"Their research has been essential for understanding how the immune system operates and why we don't all develop severe self-attack conditions," commented the chair of the award panel.

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

Our body's protection system uses immune cells that scan for signs of infection, including viruses and bacteria it has not met before.

These defenders utilize detectors—called receptors—that are produced by chance in countless combinations.

That provides the defense network the ability to fight a broad range of threats, but the unpredictability of the mechanism unavoidably creates white blood cells that can attack the body.

Protectors of the Immune System

Researchers previously knew that a portion of these problematic white blood cells were eliminated in the thymus—where immune cells mature.

The latest Nobel Prize recognizes the discovery of T-reg cells—known as the immune system's "peacekeepers"—which travel through the system to neutralize any defenders that assault the body's own tissues.

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

The prize committee stated, "These discoveries have established a novel area of investigation and spurred the development of new treatments, for instance for tumors and autoimmune diseases."

In cancer, regulatory T-cells prevent the body from attacking the growth, so studies are focused on reducing their quantity.

In self-attack disorders, trials are exploring increasing regulatory T-cells so the body is no longer being harmed. A comparable approach could also be useful in reducing the risks of organ transplant rejection.

Innovative Studies

Professor Shimon Sakaguchi, of Osaka University, performed tests on rodents that had their thymus extracted, causing self-attack conditions.

The researcher showed that injecting defense cells from other mice could prevent the illness—implying there was a system for preventing immune cells from attacking the host.

Mary Brunkow, affiliated with the a research center in Seattle, and Dr. Ramsdell, currently at a biotech firm in a California city, were studying an genetic autoimmune disease in rodents and humans that led to the discovery of a genetic factor critical for the way T-regs operate.

"Their pioneering work has revealed how the immune system is kept in check by T-reg cells, preventing it from mistakenly attacking the body's own tissues," commented a leading biological science specialist.

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