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This year's prestigious award in medical science was awarded for revolutionary discoveries that illuminate how the immune system targets dangerous infections while protecting the body's own cells.

A trio of esteemed researchers—Japan's Shimon Sakaguchi and US experts Dr. Brunkow and Dr. Ramsdell—received this honor.

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

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

The winners will share a prize fund worth 11 million Swedish kronor.

Decisive Findings

"Their research has been essential for understanding how the immune system functions and the reason we don't all suffer from severe self-attack conditions," commented the chair of the Nobel Committee.

This team's studies address a core mystery: How does the defense system defend us from numerous infections while keeping our healthy cells intact?

Our body's protection system employs immune cells that search for signs of infection, even pathogens and germs it has not met before.

Such cells employ detectors—known as receptors—that are produced by chance in countless variations.

That gives the immune system the ability to fight a wide array of threats, but the unpredictability of the mechanism unavoidably creates immune cells that can attack the host.

Security Guards of the Body

Scientists previously understood that a portion of these harmful defense cells were eliminated in the thymus—where white blood cells develop.

The latest Nobel Prize recognizes the discovery of regulatory T-cells—known as the immune system's "security guards"—which travel through the body to neutralize any immune cells that attack the healthy cells.

We know that this mechanism malfunctions in autoimmune diseases such as type-1 diabetes, multiple sclerosis, and RA.

The Nobel panel stated, "These discoveries have laid the foundation for a new field of research and spurred the creation of innovative treatments, for example for tumors and immune disorders."

In malignancies, T-regs block the system from attacking the tumor, so studies are aimed at reducing their numbers.

In autoimmune diseases, trials are testing increasing T-reg cells so the body is no longer under attack. A comparable approach could also be useful in minimizing the risks of organ transplant failure.

Pioneering Experiments

Prof Sakaguchi, from Osaka University, performed experiments on rodents that had their immune gland removed, leading to autoimmune disease.

He showed that introducing immune cells from other animals could stop the illness—suggesting there was a system for blocking defenders from harming the body.

Mary Brunkow, affiliated with the a research center in a US city, and Dr. Ramsdell, now at Sonoma Biotherapeutics in a California city, were studying an inherited autoimmune disease in rodents and humans that led to the identification of a gene vital for the way regulatory T-cells function.

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

"The research is a striking example of how fundamental physiological study can have far-reaching consequences for public health."