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This year's prestigious award in medical science was granted for revolutionary findings that illuminate how the body's defense network targets harmful pathogens while sparing the healthy tissues.

Three renowned scientists—Japan's Shimon Sakaguchi and US experts Mary Brunkow and Fred Ramsdell—received this honor.

The research identified specialized "security guards" within the immune system that eliminate rogue immune cells capable of harming the organism.

The discoveries are now enabling new treatments for autoimmune diseases and malignancies.

The winners will share a monetary award worth 11 million SEK.

Decisive Discoveries

"The work has been essential for understanding how the immune system operates and why we don't all develop serious autoimmune diseases," stated the head of the Nobel Committee.

This team's research address a core mystery: In what way does the immune system protect us from numerous invaders while keeping our healthy cells unharmed?

Our body's protection system uses immune cells that search for signs of disease, even viruses and germs it has not met before.

Such defenders utilize detectors—known as recognition units—that are produced randomly in a vast number of combinations.

This provides the immune system the ability to fight a broad range of threats, but the unpredictability of the process unavoidably creates white blood cells that may attack the body.

Protectors of the Immune System

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

This year's award honors the discovery of regulatory T-cells—described as the body's "peacekeepers"—which travel through the system to neutralize other defenders that attack the healthy cells.

We know that this process fails in self-attack conditions such as type-1 diabetes, MS, and RA.

The prize committee added, "These findings have laid the foundation for a novel area of investigation and accelerated the creation of new therapies, for instance for tumors and autoimmune diseases."

In cancer, T-regs prevent the system from attacking the tumor, so research are aimed at lowering their numbers.

In autoimmune diseases, trials are testing boosting T-reg cells so the organism is not under attack. A similar method could also be effective in reducing the risks of organ transplant failure.

Pioneering Experiments

Prof Shimon Sakaguchi, of a Japanese institution, conducted tests on mice that had their thymus extracted, leading to self-attack conditions.

He showed that injecting immune cells from other mice could stop the illness—implying there was a system for blocking immune cells from harming the host.

Dr. Brunkow, affiliated with the a research center in a US city, and Fred Ramsdell, currently at Sonoma Biotherapeutics in San Francisco, were investigating an genetic immune disorder in rodents and humans that resulted in the discovery of a genetic factor vital for how regulatory T-cells function.

"The pioneering work has revealed how the body's defenses is kept in check by regulatory T cells, stopping it from mistakenly targeting the body's own tissues," commented a leading biological science specialist.

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