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The prestigious award in medical science was granted for revolutionary findings that illuminate how the body's defense network targets dangerous infections while sparing the body's own cells.

Three esteemed scientists—Japan's Prof. Sakaguchi and US experts Mary Brunkow and Dr. Ramsdell—share this honor.

The work identified specialized "sentinels" within the defense system that remove rogue defense cells capable of attacking the body.

The discoveries are now paving the way for new treatments for immune disorders and malignancies.

The winners will divide a prize fund worth 11m SEK.

Decisive Findings

"The work has been essential for comprehending how the body's defenses operates and the reason we do not all develop severe self-attack conditions," stated the head of the Nobel Committee.

This team's research explain a fundamental question: In what way does the immune system defend us from numerous infections while keeping our own tissues unharmed?

Our immune system uses immune cells that search for signs of infection, including pathogens and germs it has never encountered.

These defenders employ sensors—known as receptors—that are produced by chance in a vast number of combinations.

That provides the defense network the capacity to fight a wide array of threats, but the unpredictability of the process inevitably creates white blood cells that may attack the host.

Protectors of the Immune System

Researchers earlier understood that some of these harmful defense cells were destroyed in the immune organ—where white blood cells develop.

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

We know that this mechanism fails in autoimmune diseases such as type-1 diabetes, MS, and rheumatoid arthritis.

A prize committee added, "These discoveries have laid the foundation for a novel area of research and spurred the development of innovative treatments, for example for cancer and immune disorders."

Regarding malignancies, T-regs prevent the body from fighting the growth, so research are focused on reducing their quantity.

In autoimmune diseases, trials are testing increasing regulatory T-cells so the body is not being harmed. A comparable method could also be useful in reducing the chances of organ transplant failure.

Pioneering Studies

Prof Sakaguchi, of Osaka University, conducted experiments on mice that had their thymus extracted, causing autoimmune disease.

He showed that introducing defense cells from healthy animals could stop the illness—implying there was a mechanism for blocking immune cells from attacking the host.

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

"The pioneering work has revealed how the body's defenses is controlled by T-reg cells, stopping it from accidentally targeting the healthy cells," said a prominent physiology expert.

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