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This year's prestigious award in medical science was granted for transformative findings that clarify how the body's defense network attacks harmful infections while protecting the body's own cells.

Three renowned scientists—from Japan Prof. Sakaguchi and US scientists Dr. Brunkow and Dr. Ramsdell—received this honor.

Their research uncovered specialized "sentinels" within the immune system that remove malfunctioning defense cells that could attacking the organism.

These findings are now enabling innovative therapies for immune disorders and malignancies.

The winners will divide a monetary award worth 11 million SEK.

Crucial Findings

"The work has been essential for understanding how the immune system functions and why we don't all develop serious autoimmune diseases," commented the chair of the Nobel Committee.

The team's research address a core question: In what way does the defense system defend us from countless infections while leaving our healthy cells intact?

Our body's protection system employs immune cells that search for signs of disease, even viruses and bacteria it has not met before.

These cells employ sensors—called receptors—that are generated by chance in countless variations.

This provides the defense network the capacity to fight a wide array of threats, but the unpredictability of the process unavoidably creates white blood cells that can target the host.

Protectors of the Body

Scientists earlier knew that a portion of these harmful white blood cells were destroyed in the thymus—where immune cells develop.

The latest Nobel Prize honors the identification of regulatory T-cells—known as the immune system's "peacekeepers"—which travel through the body to neutralize any immune cells that assault the healthy cells.

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

The prize committee stated, "These discoveries have laid the foundation for a novel area of investigation and spurred the creation of innovative therapies, for instance for cancer and immune disorders."

In malignancies, T-regs prevent the body from fighting the growth, so studies are focused on reducing their numbers.

For self-attack disorders, experiments are testing boosting regulatory T-cells so the body is not being harmed. A comparable approach could also be effective in reducing the chances of transplanted organ failure.

Pioneering Experiments

Prof Shimon Sakaguchi, of Osaka University, performed experiments on mice that had their thymus extracted, leading to autoimmune disease.

The researcher demonstrated that injecting immune cells from other animals could stop the disease—implying there was a system for preventing immune cells from attacking the host.

Mary Brunkow, affiliated with the Institute for Systems Biology in Seattle, and Dr. Ramsdell, currently at a biotech firm in San Francisco, were studying an inherited autoimmune disease in rodents and humans that led to the discovery of a gene vital for how regulatory T-cells operate.

"The groundbreaking research has uncovered how the body's defenses is kept in check by T-reg cells, preventing it from accidentally attacking the body's own tissues," said a leading biological science specialist.

"This research is a striking example of how basic physiological study can have broad consequences for human health."