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The prestigious award in Physiology or Medicine has been granted for transformative discoveries that clarify how the body's defense network targets harmful pathogens while protecting the body's own cells.

A trio of renowned scientists—Japan's Prof. Sakaguchi and US experts Mary Brunkow and Fred Ramsdell—share this honor.

Their work identified specialized "security guards" within the immune system that remove rogue defense cells capable of attacking the body.

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

The laureates will divide a monetary award valued at 11 million SEK.

Decisive Findings

"Their research has been decisive for comprehending how the immune system operates and why we do not all suffer from serious self-attack conditions," stated the chair of the award panel.

This trio's research address a fundamental mystery: How does the immune system protect us from countless invaders while keeping our healthy cells intact?

Our body's protection 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 produced by chance in countless combinations.

That gives the immune system the ability to fight a broad range of invaders, but the unpredictability of the process unavoidably creates immune cells that may attack the body.

Protectors of the Body

Researchers earlier knew that some of these problematic white blood cells were destroyed in the immune organ—the site where white blood cells mature.

This year's Nobel Prize honors the discovery of T-reg cells—described as the body's "peacekeepers"—which travel through the system to neutralize any immune cells that attack the healthy cells.

We know that this mechanism fails in autoimmune diseases such as juvenile diabetes, MS, and rheumatoid arthritis.

A prize committee stated, "These discoveries have established a novel area of research and accelerated the development of new therapies, for instance for cancer and immune disorders."

In malignancies, regulatory T-cells block the body from attacking the growth, so studies are aimed at reducing their numbers.

For autoimmune diseases, trials are exploring boosting T-reg cells so the body is no longer being harmed. A comparable approach could also be effective in reducing the risks of organ transplant failure.

Pioneering Experiments

Prof Sakaguchi, from Osaka University, performed tests on mice that had their thymus extracted, causing autoimmune disease.

The researcher demonstrated that injecting defense cells from healthy animals could stop the illness—implying there was a system for blocking immune cells from attacking the host.

Mary Brunkow, affiliated with the a research center in Seattle, and Fred Ramsdell, currently at Sonoma Biotherapeutics in a California city, were investigating an genetic immune disorder in mice and people that led to the identification of a genetic factor vital for how regulatory T-cells function.

"The pioneering research has uncovered how the body's defenses is kept in check by regulatory T cells, stopping it from mistakenly attacking the healthy cells," said a leading physiology expert.

"The research is a remarkable illustration of how fundamental physiological research can have broad consequences for human health."