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The prestigious award in medical science was awarded for transformative discoveries that illuminate how the immune system attacks dangerous infections while protecting the healthy tissues.

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

Their research uncovered specialized "sentinels" within the defense system that eliminate malfunctioning defense cells that could harming the organism.

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

The winners will share a prize fund valued at 11m SEK.

Crucial Findings

"Their research has been essential for understanding how the immune system operates and the reason we don't all develop serious self-attack conditions," commented the chair of the Nobel Committee.

This trio's studies address a fundamental question: How does the defense system protect us from numerous infections while leaving our own tissues unharmed?

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

Such defenders utilize detectors—called recognition units—that are produced by chance in countless combinations.

This provides the defense network the ability to fight a broad range of invaders, but the randomness of the process inevitably produces white blood cells that can target the body.

Protectors of the Body

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

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

We know that this process fails in autoimmune diseases such as type-1 diabetes, MS, and RA.

The Nobel panel stated, "These findings have laid the foundation for a new field of investigation and spurred the development of innovative treatments, for example for cancer and immune disorders."

In cancer, T-regs block the system from fighting the tumor, so studies are focused on reducing their quantity.

For autoimmune diseases, trials are testing increasing regulatory T-cells so the body is not under attack. A similar approach could also be useful in reducing the chances of organ transplant rejection.

Innovative Studies

Professor Shimon Sakaguchi, from a Japanese institution, performed tests on mice that had their immune gland removed, causing autoimmune disease.

The researcher showed that introducing immune cells from other mice could stop the illness—suggesting there was a system for blocking immune cells from attacking the body.

Mary Brunkow, affiliated with the Institute for Systems Biology in a US city, and Fred Ramsdell, now at Sonoma Biotherapeutics in a California city, were studying an inherited immune disorder in mice and humans that resulted in the discovery of a gene critical for how T-regs function.

"Their pioneering research has uncovered how the body's defenses is kept in check by T-reg cells, stopping it from mistakenly attacking the healthy cells," said a prominent biological science specialist.

"This work is a striking illustration of how fundamental biological study can have broad implications for public health."