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The Nobel Prize in medical science has been awarded for transformative findings that clarify how the immune system attacks dangerous infections while sparing the healthy tissues.

A trio of esteemed scientists—from Japan Shimon Sakaguchi and American experts Dr. Brunkow and Dr. Ramsdell—share this accolade.

Their work identified unique "security guards" within the immune system that eliminate rogue defense cells capable of attacking the organism.

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

The laureates will divide a prize fund valued at 11m Swedish kronor.

Decisive Findings

"Their research has been essential for understanding how the body's defenses operates and why we do not all suffer from serious self-attack conditions," stated the chair of the Nobel Committee.

This team's research address a core mystery: How does the immune system protect us from countless invaders while leaving our healthy cells unharmed?

Our immune system uses white blood cells that search for indicators of infection, including viruses and bacteria it has not met before.

These cells utilize sensors—known as receptors—that are generated randomly in countless variations.

This gives the defense network the ability to combat a wide array of threats, but the randomness of the mechanism inevitably produces immune cells that may target the body.

Protectors of the Immune System

Scientists earlier knew that a portion of these harmful defense cells were eliminated in the thymus—the site where immune cells mature.

This year's award recognizes the discovery of regulatory T-cells—known as the immune system's "peacekeepers"—which travel through the system to disarm other defenders that assault the healthy cells.

We know that this process malfunctions in autoimmune diseases such as type-1 diabetes, multiple sclerosis, and rheumatoid arthritis.

The Nobel panel stated, "These discoveries have established a new field of research and spurred the creation of new therapies, for instance for tumors and immune disorders."

In cancer, regulatory T-cells prevent the system from attacking the growth, so research are aimed at lowering their quantity.

In autoimmune diseases, trials are testing boosting T-reg cells so the organism is no longer under attack. A similar method could also be effective in minimizing the risks of transplanted organ rejection.

Pioneering Experiments

Prof Sakaguchi, of Osaka University, conducted tests on rodents that had their immune gland extracted, leading to autoimmune disease.

The researcher demonstrated that introducing defense cells from other mice could prevent the disease—suggesting there was a mechanism for preventing defenders from harming the body.

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 inherited autoimmune disease in mice and humans that led to the discovery of a genetic factor critical for the way regulatory T-cells function.

"The pioneering research has revealed how the body's defenses is controlled by regulatory T cells, stopping it from mistakenly attacking the body's own tissues," said a prominent physiology specialist.

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