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The Nobel Prize in Physiology or Medicine was awarded for transformative discoveries that illuminate how the immune system targets dangerous pathogens while sparing the healthy tissues.

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

Their work identified unique "sentinels" within the immune system that remove malfunctioning defense cells capable of harming the organism.

The findings are now paving the way for new treatments for immune disorders and cancer.

The laureates will divide a prize fund worth 11 million SEK.

Crucial Discoveries

"Their research has been decisive for comprehending how the immune system operates and why we do not all suffer from severe self-attack conditions," commented the head of the award panel.

The team's studies address a core mystery: How does the immune system protect us from numerous infections while keeping our healthy cells unharmed?

The body's protection system employs immune cells that search for indicators of disease, even pathogens and germs it has never encountered.

Such cells utilize sensors—called receptors—that are generated by chance in a vast number of variations.

That provides the immune system the ability to combat a broad range of invaders, but the unpredictability of the process unavoidably produces immune cells that may target the body.

Security Guards of the Immune System

Researchers earlier understood that a portion of these harmful white blood cells were destroyed in the thymus—the site where white blood cells develop.

The latest award honors the identification of T-reg cells—described as the immune system's "security guards"—which travel through the system to disarm any defenders that assault the body's own tissues.

We know that this process fails in self-attack conditions such as type-1 diabetes, multiple sclerosis, and rheumatoid arthritis.

A Nobel panel added, "The findings have laid the foundation for a new field of research and accelerated the creation of new treatments, for example for tumors and autoimmune diseases."

Regarding cancer, regulatory T-cells prevent the system from fighting the growth, so studies are aimed at reducing their quantity.

For self-attack disorders, experiments are testing boosting regulatory T-cells so the organism is no longer under attack. A similar method could also be useful in minimizing the risks of transplanted organ rejection.

Pioneering Studies

Prof Shimon Sakaguchi, of Osaka University, performed tests on rodents that had their immune gland removed, causing autoimmune disease.

The researcher demonstrated that introducing immune cells from other animals could prevent the disease—implying 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 a biotech firm in San Francisco, were studying an genetic immune disorder in mice and humans that led to the identification of a genetic factor critical for how T-regs operate.

"Their pioneering work has revealed how the immune system is controlled by T-reg cells, stopping it from mistakenly attacking the healthy cells," commented a prominent physiology specialist.

"This research is a striking example of how basic physiological study can have far-reaching consequences for human health."