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

A trio of esteemed scientists—from Japan Shimon Sakaguchi and US experts Mary Brunkow and Fred Ramsdell—share this honor.

The work uncovered unique "sentinels" within the defense system that eliminate malfunctioning immune cells that could harming the body.

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

These laureates will share a monetary award worth 11m Swedish kronor.

Decisive Discoveries

"Their research has been decisive for comprehending how the body's defenses operates and why we don't all develop severe autoimmune diseases," stated the head of the Nobel Committee.

This trio's research address a core question: In what way does the immune system defend us from countless invaders while leaving our healthy cells unharmed?

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

These defenders utilize detectors—known as receptors—that are generated by chance in countless variations.

This provides the immune system the ability to combat a wide array of invaders, but the unpredictability of the process inevitably produces white blood cells that may attack the body.

Security Guards of the Immune System

Scientists previously knew that some of these problematic white blood cells were destroyed in the thymus—the site where white blood cells mature.

This year's award honors the identification of regulatory T-cells—described as the immune system's "peacekeepers"—which travel through the system to disarm any defenders that attack the healthy cells.

We know that this process fails in self-attack conditions such as juvenile diabetes, multiple sclerosis, and RA.

A prize committee stated, "The discoveries have laid the foundation for a novel area of investigation and spurred the creation of innovative therapies, for example for cancer and immune disorders."

In malignancies, regulatory T-cells block the body from attacking the growth, so research are focused on lowering their numbers.

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

Innovative Experiments

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

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

Mary Brunkow, from the a research center in a US city, and Fred Ramsdell, currently at Sonoma Biotherapeutics in a California city, were studying an inherited immune disorder in rodents and humans that resulted in the discovery of a gene vital for the way T-regs operate.

"Their groundbreaking research has revealed how the body's defenses is kept in check by T-reg cells, preventing it from accidentally attacking the healthy cells," said a prominent biological science expert.

"The work is a striking example of how basic physiological study can have broad consequences for public health."