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The Nobel Prize in medical science has been awarded for transformative discoveries that illuminate how the body's defense network attacks harmful pathogens while protecting the healthy tissues.

Three esteemed scientists—Japan's Shimon Sakaguchi and US scientists Mary Brunkow and Dr. Ramsdell—received this honor.

Their work uncovered specialized "sentinels" within the defense system that remove malfunctioning defense cells that could attacking the organism.

The discoveries are now enabling innovative treatments for immune disorders and malignancies.

The winners will divide a prize fund worth 11m Swedish kronor.

Decisive Discoveries

"Their research has been decisive for comprehending how the immune system functions and the reason we don't all develop serious self-attack conditions," commented the head of the Nobel Committee.

This trio's research explain a core question: How does the immune system defend us from countless invaders while keeping our healthy cells unharmed?

The immune system employs white blood cells that scan for indicators of infection, even pathogens and germs it has not met before.

Such defenders employ sensors—known as recognition units—that are generated randomly in countless combinations.

That gives the immune system the ability to fight a wide array of invaders, but the randomness of the mechanism inevitably produces white blood cells that can target the host.

Security Guards of the Body

Researchers previously knew that a portion of these problematic defense cells were eliminated in the thymus—where white blood cells mature.

This year's Nobel Prize recognizes the identification of regulatory T-cells—known as the body's "peacekeepers"—which travel through the body to disarm any immune cells that assault the body's own tissues.

It is known that this mechanism malfunctions in autoimmune diseases such as juvenile diabetes, MS, and RA.

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

In cancer, T-regs block the body from attacking the growth, so research are focused on reducing their quantity.

For self-attack disorders, experiments are exploring boosting regulatory T-cells so the body is no longer being harmed. A comparable approach could also be effective in minimizing the risks of transplanted organ failure.

Pioneering Experiments

Professor Shimon Sakaguchi, from Osaka University, performed experiments on rodents that had their immune gland extracted, leading to autoimmune disease.

The researcher showed that injecting immune cells from other mice could stop the illness—implying 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, now at a biotech firm in a California city, were investigating an genetic autoimmune disease in rodents and humans that led to the discovery of a gene vital for how regulatory T-cells operate.

"The groundbreaking work has revealed how the immune system is controlled by regulatory T cells, preventing it from mistakenly attacking the healthy cells," commented a prominent physiology specialist.

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