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This year's Nobel Prize in medical science was awarded for transformative findings that clarify how the body's defense network attacks harmful infections while sparing the healthy tissues.

Three esteemed researchers—from Japan Prof. Sakaguchi and US scientists Mary Brunkow and Fred Ramsdell—received this honor.

Their research identified specialized "security guards" within the defense system that remove malfunctioning defense cells that could harming the body.

The findings are now paving the way for new therapies for autoimmune diseases and malignancies.

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

Decisive Discoveries

"Their work has been essential for comprehending how the body's defenses functions and the reason we don't all suffer from serious self-attack conditions," commented the head of the award panel.

This team's research explain a fundamental question: In what way does the immune system defend us from numerous invaders while leaving our healthy cells unharmed?

Our immune system uses white blood cells that scan for indicators of disease, including viruses and bacteria it has not met before.

These cells utilize detectors—known as recognition units—that are generated randomly in a vast number of variations.

That provides the defense network the ability to combat a wide array of invaders, but the unpredictability of the mechanism unavoidably produces immune cells that can target the body.

Security Guards of the Immune System

Scientists earlier knew that some of these harmful defense cells were eliminated in the immune organ—the site where immune cells mature.

This year's award recognizes the identification of T-reg cells—described as the immune system's "security guards"—which travel through the body to neutralize any immune cells that assault the healthy cells.

It is known that this process malfunctions in autoimmune diseases such as type-1 diabetes, multiple sclerosis, and rheumatoid arthritis.

A Nobel panel added, "The discoveries have laid the foundation for a new field of research and spurred the development of innovative treatments, for instance for cancer and autoimmune diseases."

In cancer, regulatory T-cells block the system from attacking the growth, so research are focused on reducing their quantity.

For self-attack disorders, trials are testing boosting T-reg cells so the organism is no longer under attack. A similar approach could also be useful in minimizing the chances of transplanted organ failure.

Pioneering Experiments

Professor Sakaguchi, of Osaka University, performed experiments on mice that had their immune gland removed, leading to autoimmune disease.

The researcher showed that introducing immune cells from other animals could prevent the disease—suggesting there was a mechanism for blocking immune cells from attacking the host.

Mary Brunkow, affiliated with the a research center in a US city, and Dr. Ramsdell, currently at Sonoma Biotherapeutics in a California city, were investigating an genetic immune disorder in mice and humans that led to the identification of a genetic factor vital for the way regulatory T-cells function.

"Their groundbreaking work has revealed how the immune system is controlled by regulatory T cells, stopping it from mistakenly targeting the body's own tissues," said a leading physiology expert.

"This research is a remarkable example of how fundamental biological study can have broad consequences for human health."