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This year's Nobel Prize in Physiology or Medicine was granted for transformative findings that clarify how the body's defense network targets dangerous infections while protecting the body's own cells.

A trio of renowned scientists—from Japan Shimon Sakaguchi and US scientists Mary Brunkow and Dr. Ramsdell—received this accolade.

The work uncovered specialized "security guards" within the defense system that eliminate rogue defense cells that could harming the organism.

The discoveries are now enabling innovative treatments for autoimmune diseases and cancer.

These laureates will divide a prize fund valued at 11m SEK.

Decisive Discoveries

"Their work has been essential for understanding how the immune system operates and why we don't all develop severe autoimmune diseases," commented the chair of the award panel.

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

The body's protection system employs immune cells that search for signs of infection, including pathogens and bacteria it has not met before.

These defenders employ sensors—known as recognition units—that are produced randomly in countless variations.

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

Protectors of the Body

Scientists previously understood that some of these problematic defense cells were destroyed in the thymus—where immune cells develop.

The latest award honors the identification of T-reg cells—known as the immune system's "peacekeepers"—which patrol the system to disarm any defenders that attack the body's own tissues.

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

The prize committee stated, "The findings have established a new field of investigation and spurred the development of new treatments, for example for tumors and autoimmune diseases."

Regarding cancer, T-regs block the body from fighting the tumor, so research are focused on lowering their numbers.

For autoimmune diseases, trials are exploring boosting T-reg cells so the body is not under attack. A similar approach could also be effective in minimizing the risks of transplanted organ failure.

Pioneering Studies

Prof Sakaguchi, from Osaka University, performed tests on mice that had their immune gland extracted, causing self-attack conditions.

The researcher demonstrated that injecting defense cells from other animals could stop the illness—suggesting there was a system for blocking immune cells from attacking the body.

Dr. Brunkow, affiliated with the a research center in a US city, and Fred Ramsdell, currently at a biotech firm in a California city, were investigating an genetic autoimmune disease in rodents and people that resulted in the discovery of a genetic factor critical for the way T-regs operate.

"The pioneering research has revealed how the immune system is controlled by T-reg cells, preventing it from mistakenly targeting the healthy cells," commented a leading biological science expert.

"The research is a remarkable example of how fundamental physiological research can have broad consequences for human health."