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The prestigious award in medical science has been granted for transformative discoveries that clarify how the body's defense network attacks dangerous pathogens while protecting the body's own cells.

A trio of esteemed scientists—Japan's Shimon Sakaguchi and American experts Mary Brunkow and Fred Ramsdell—received this accolade.

Their research identified unique "security guards" within the defense system that eliminate rogue defense cells that could attacking the body.

These findings are now enabling new treatments for autoimmune diseases and cancer.

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

Crucial Discoveries

"Their research has been decisive for comprehending how the immune system operates and why we don't all develop serious self-attack conditions," stated the head of the Nobel Committee.

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

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

These defenders employ detectors—called recognition units—that are generated randomly in a vast number of variations.

That gives the immune system the ability to combat a wide array of threats, but the unpredictability of the process inevitably produces white blood cells that can target the host.

Security Guards of the Body

Scientists earlier understood that a portion of these harmful defense cells were destroyed in the immune organ—the site where immune cells mature.

The latest Nobel Prize recognizes the discovery of T-reg cells—known as the immune system's "peacekeepers"—which patrol the system to disarm other immune cells that assault the body's own tissues.

It is known that this mechanism malfunctions in autoimmune diseases such as type-1 diabetes, MS, and RA.

The prize committee added, "These findings have established a new field of investigation and spurred the creation of new treatments, for example for tumors and immune disorders."

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

For self-attack disorders, trials are exploring boosting T-reg cells so the body is not being harmed. A similar approach could also be effective in reducing the chances of organ transplant rejection.

Pioneering Experiments

Prof Shimon Sakaguchi, of Osaka University, conducted tests on rodents that had their thymus extracted, causing autoimmune disease.

The researcher showed that introducing defense cells from healthy animals could prevent the disease—suggesting there was a system for blocking defenders from attacking the host.

Dr. Brunkow, affiliated with the Institute for Systems Biology in Seattle, and Fred Ramsdell, now at Sonoma Biotherapeutics in San Francisco, were investigating an genetic autoimmune disease in rodents and people that resulted in the discovery of a gene critical for how T-regs function.

"Their groundbreaking research has uncovered how the immune system is controlled by regulatory T cells, stopping it from mistakenly attacking the body's own tissues," said a prominent physiology specialist.

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