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This year's Nobel Prize in Physiology or Medicine was awarded for revolutionary discoveries that clarify how the immune system targets dangerous pathogens while sparing the healthy tissues.

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

Their work identified specialized "sentinels" within the immune system that remove rogue defense cells that could attacking the body.

These discoveries are now enabling new treatments for immune disorders and malignancies.

The winners will share a monetary award valued at 11m SEK.

Decisive Discoveries

"Their work has been essential for understanding how the body's defenses operates and why we don't all develop severe self-attack conditions," commented the chair of the Nobel Committee.

The team's studies address a fundamental question: How does the immune system protect us from numerous invaders while leaving our healthy cells intact?

Our immune system employs white blood cells that scan for indicators of infection, including viruses and bacteria it has never encountered.

Such defenders utilize sensors—known as recognition units—that are generated randomly in countless variations.

That provides the immune system the capacity to fight a broad range of invaders, but the randomness of the mechanism inevitably creates immune cells that can target the host.

Protectors of the Body

Scientists earlier understood that some of these harmful white blood cells were destroyed in the thymus—the site where immune cells develop.

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

It is known that this process malfunctions in self-attack conditions such as type-1 diabetes, MS, and RA.

A prize committee stated, "These findings have established a novel area of investigation and accelerated the creation of new treatments, for example for tumors and autoimmune diseases."

Regarding cancer, T-regs prevent the system from fighting the growth, so research are aimed at lowering their numbers.

In autoimmune diseases, trials are exploring increasing T-reg cells so the body is no longer being harmed. A similar method could also be effective in reducing the risks of transplanted organ failure.

Pioneering Experiments

Prof Shimon Sakaguchi, of Osaka University, conducted experiments on mice that had their thymus removed, causing self-attack conditions.

The researcher showed that injecting defense cells from other animals could prevent the illness—implying there was a mechanism for preventing defenders from attacking the body.

Mary Brunkow, from the a research center in a US city, and Dr. Ramsdell, currently at a biotech firm in a California city, were studying an genetic immune disorder in rodents and people that led to the identification of a genetic factor vital for the way T-regs function.

"Their pioneering research has revealed how the immune system is kept in check by regulatory T cells, stopping it from mistakenly attacking the healthy cells," said a leading physiology expert.

"The research is a remarkable illustration of how basic biological study can have far-reaching implications for public health."