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The prestigious award in Physiology or Medicine has been awarded for revolutionary discoveries that clarify how the immune system targets harmful pathogens while protecting the healthy tissues.

A trio of esteemed scientists—from Japan Prof. Sakaguchi and American scientists Mary Brunkow and Fred Ramsdell—received this accolade.

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

These findings are now enabling innovative treatments for immune disorders and cancer.

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

Crucial Discoveries

"The research has been essential for comprehending how the immune system functions and the reason we don't all develop severe self-attack conditions," stated the chair of the award panel.

The team's studies address a fundamental mystery: How does the defense system protect us from countless infections while keeping our own tissues unharmed?

The body's protection system employs white blood cells that scan for signs of disease, even pathogens and germs it has never encountered.

Such defenders employ sensors—called recognition units—that are generated by chance in a vast number of combinations.

This gives the immune system the capacity to fight a wide array of threats, but the randomness of the mechanism inevitably creates white blood cells that can target the body.

Security Guards of the Immune System

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

This year's award honors the identification of regulatory T-cells—known as the immune system's "peacekeepers"—which patrol the body to disarm any immune cells that attack the healthy cells.

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

A Nobel panel stated, "The findings have established a novel area of research and spurred the development of new therapies, for instance for tumors and immune disorders."

In cancer, regulatory T-cells block the body from attacking the growth, so studies are aimed at lowering their quantity.

For autoimmune diseases, experiments are testing increasing regulatory T-cells so the body is not under attack. A comparable method could also be effective in minimizing the chances of organ transplant rejection.

Innovative Experiments

Prof Shimon Sakaguchi, from Osaka University, conducted tests on mice that had their thymus removed, causing self-attack conditions.

The researcher showed that injecting immune cells from other animals could prevent the disease—suggesting there was a mechanism for preventing defenders from attacking the host.

Dr. Brunkow, from 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 mice and humans that resulted in the identification of a gene vital for the way regulatory T-cells operate.

"Their groundbreaking work has uncovered how the immune system is kept in check by regulatory T cells, stopping it from accidentally targeting the healthy cells," said a leading biological science specialist.

"The research is a striking example of how basic physiological research can have broad consequences for public health."