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This year's prestigious award in Physiology or Medicine was awarded for revolutionary findings that illuminate how the body's defense network targets dangerous infections while protecting the body's own cells.

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

The research identified specialized "security guards" within the defense system that eliminate rogue defense cells capable of attacking the body.

The discoveries are now enabling new therapies for immune disorders and malignancies.

These winners will divide a monetary award worth 11m SEK.

Decisive Findings

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

This trio's research explain a fundamental mystery: In what way does the immune system defend us from countless infections while keeping our healthy cells unharmed?

Our body's protection system employs immune cells that search for indicators of disease, including pathogens and bacteria it has not met before.

These cells employ sensors—known as recognition units—that are generated randomly in countless combinations.

That provides the immune system the ability to combat a wide array of threats, but the unpredictability of the process unavoidably creates immune cells that can target the body.

Protectors of the Immune System

Researchers earlier understood that a portion of these problematic white blood cells were destroyed in the immune organ—where immune cells develop.

The latest Nobel Prize honors the identification of regulatory T-cells—described as the body's "peacekeepers"—which travel through the body to neutralize any defenders that attack the healthy cells.

It is known that this mechanism fails in self-attack conditions such as juvenile diabetes, multiple sclerosis, and RA.

The prize committee added, "The discoveries have laid the foundation for a novel area of investigation and spurred the development of innovative therapies, for example for tumors and autoimmune diseases."

Regarding malignancies, T-regs block the body from fighting the growth, so studies are aimed at lowering their numbers.

In autoimmune diseases, experiments are exploring increasing T-reg cells so the organism is no longer being harmed. A comparable approach could also be useful in minimizing the chances of organ transplant failure.

Pioneering Experiments

Professor Sakaguchi, from Osaka University, performed experiments on rodents that had their immune gland removed, causing self-attack conditions.

He demonstrated that injecting defense cells from healthy animals could prevent the illness—implying there was a mechanism for preventing defenders from attacking the body.

Dr. Brunkow, from the Institute for Systems Biology in a US city, and Dr. Ramsdell, now at a biotech firm in San Francisco, were investigating an genetic autoimmune disease in rodents and people that resulted in the identification of a genetic factor critical for how regulatory T-cells operate.

"Their groundbreaking research has uncovered how the body's defenses is controlled by T-reg cells, stopping it from mistakenly attacking the healthy cells," said a leading physiology specialist.

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