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

A trio of esteemed researchers—from Japan Prof. Sakaguchi and American scientists Dr. Brunkow and Dr. Ramsdell—received this honor.

Their research uncovered specialized "security guards" within the immune system that eliminate malfunctioning immune cells capable of harming the body.

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

These winners will divide a monetary award valued at 11 million SEK.

Crucial Discoveries

"The research has been essential for comprehending how the immune system operates and why we do not all suffer from serious autoimmune diseases," commented the chair of the award panel.

This trio's studies address a fundamental mystery: In what way does the immune system protect us from numerous infections while leaving our own tissues unharmed?

The immune system employs white blood cells that scan for signs of disease, including viruses and germs it has not met before.

These cells employ sensors—called recognition units—that are produced by chance in countless variations.

That gives the defense network the capacity to fight a wide array of threats, but the randomness of the mechanism unavoidably creates immune cells that can attack the body.

Protectors of the Body

Researchers earlier understood that some of these harmful defense cells were destroyed in the immune organ—the site where immune cells mature.

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

We know that this mechanism fails in self-attack conditions such as juvenile diabetes, MS, and rheumatoid arthritis.

The Nobel panel stated, "These discoveries have laid the foundation for a novel area of investigation and accelerated the creation of new treatments, for example for tumors and autoimmune diseases."

Regarding cancer, regulatory T-cells block the body from attacking the tumor, so studies are focused on reducing their numbers.

For autoimmune diseases, experiments are exploring increasing regulatory T-cells so the body is no longer under attack. A similar method could also be effective in minimizing the risks of transplanted organ rejection.

Pioneering Studies

Prof Sakaguchi, of a Japanese institution, performed tests on mice that had their thymus extracted, causing self-attack conditions.

He demonstrated that introducing defense cells from other animals could stop the disease—implying there was a system for preventing defenders from harming the host.

Dr. Brunkow, affiliated with the Institute for Systems Biology in a US city, and Fred Ramsdell, currently at Sonoma Biotherapeutics in San Francisco, were investigating an genetic autoimmune disease in rodents and humans that led to the identification of a gene vital for the way T-regs function.

"Their groundbreaking work has revealed how the body's defenses is controlled by T-reg cells, preventing it from mistakenly targeting the healthy cells," commented a prominent biological science specialist.

"This research is a remarkable illustration of how basic physiological study can have far-reaching consequences for public health."