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The Nobel Prize in medical science was granted for revolutionary discoveries that clarify how the body's defense network attacks harmful infections while sparing the body's own cells.

A trio of renowned researchers—Japan's Shimon Sakaguchi and US scientists Dr. Brunkow and Dr. Ramsdell—share this accolade.

Their research identified unique "sentinels" within the immune system that remove rogue immune cells capable of harming the body.

These findings are now paving the way for new therapies for immune disorders and cancer.

These winners will share a monetary award valued at 11m SEK.

Decisive Discoveries

"Their work has been decisive for comprehending how the immune system operates and the reason we don't all suffer from severe self-attack conditions," stated the head of the Nobel Committee.

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

The immune system uses immune cells that scan for indicators of infection, even viruses and germs it has never encountered.

Such defenders employ sensors—known as receptors—that are generated by chance in countless combinations.

This gives the defense network the capacity to fight a broad range of invaders, but the unpredictability of the process unavoidably creates white blood cells that can target the body.

Security Guards of the Body

Scientists previously understood that some of these harmful defense cells were eliminated in the immune organ—where white blood cells mature.

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

It is known that this process fails in autoimmune diseases such as type-1 diabetes, multiple sclerosis, and RA.

A prize committee stated, "The discoveries have laid the foundation for a new field of research and accelerated the development of new treatments, for example for tumors and autoimmune diseases."

Regarding cancer, regulatory T-cells block the body from fighting the growth, so research are aimed at reducing their numbers.

In self-attack disorders, trials are testing increasing regulatory T-cells so the body is not under attack. A comparable approach could also be useful in reducing the risks of organ transplant failure.

Innovative Experiments

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

He showed that injecting defense cells from healthy mice could stop the disease—suggesting there was a mechanism for preventing immune cells from attacking the host.

Mary Brunkow, affiliated with the Institute for Systems Biology in a US city, and Dr. Ramsdell, currently at a biotech firm in San Francisco, were investigating an genetic autoimmune disease in mice and humans that led to the identification of a gene vital for how T-regs function.

"Their groundbreaking work has uncovered how the body's defenses is kept in check by T-reg cells, stopping it from accidentally targeting the healthy cells," said a prominent biological science specialist.

"The work is a striking illustration of how basic biological study can have broad implications for human health."