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

Three renowned scientists—Japan's Shimon Sakaguchi and US experts Mary Brunkow and Fred Ramsdell—share this accolade.

Their research identified specialized "sentinels" within the immune system that eliminate rogue defense cells capable of harming the organism.

These findings are now paving the way for innovative treatments for autoimmune diseases and malignancies.

These winners will divide a prize fund worth 11 million SEK.

Crucial Findings

"The research has been essential for comprehending how the immune system functions and why we don't all suffer from severe autoimmune diseases," stated the head of the award panel.

The team's research address a fundamental question: In what way does the immune system defend us from numerous invaders while keeping our healthy cells intact?

The immune system employs white blood cells that search for signs of disease, even viruses and germs it has never encountered.

Such cells employ detectors—known as recognition units—that are produced by chance in a vast number of combinations.

That provides the defense network the ability to combat a wide array of invaders, but the randomness of the process inevitably produces immune cells that can attack the body.

Protectors of the Body

Researchers earlier understood that a portion of these problematic white blood cells were eliminated in the immune organ—where immune cells mature.

The latest award honors the discovery of regulatory T-cells—described as the body's "peacekeepers"—which travel through the body to neutralize other defenders that assault the body's own tissues.

We know that this process fails in autoimmune diseases such as juvenile diabetes, multiple sclerosis, and rheumatoid arthritis.

A Nobel panel added, "These discoveries have laid the foundation for a new field of investigation and spurred the development of new treatments, for instance for cancer and immune disorders."

In malignancies, regulatory T-cells prevent the system from fighting the tumor, so research are focused on lowering their quantity.

In autoimmune diseases, experiments are testing boosting T-reg cells so the body is no longer under attack. A similar method could also be useful in reducing the risks of transplanted organ rejection.

Pioneering Experiments

Prof Sakaguchi, from Osaka University, performed experiments on rodents that had their immune gland extracted, leading to autoimmune disease.

He showed that injecting defense cells from other animals could prevent the illness—implying there was a mechanism for blocking defenders from harming the host.

Dr. Brunkow, from the Institute for Systems Biology in Seattle, and Fred Ramsdell, currently at a biotech firm in San Francisco, were investigating an genetic autoimmune disease in rodents and humans that resulted in the identification of a gene critical for the way regulatory T-cells function.

"The groundbreaking work has uncovered how the body's defenses is controlled by T-reg cells, stopping it from accidentally attacking the body's own tissues," said a prominent physiology specialist.

"The work is a striking illustration of how basic biological research can have broad consequences for public health."