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The prestigious award in Physiology or Medicine was awarded for transformative discoveries that clarify how the immune system targets harmful infections while sparing the healthy tissues.

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

Their work uncovered specialized "security guards" within the immune system that remove malfunctioning immune cells capable of attacking the organism.

These discoveries are now paving the way for new treatments for autoimmune diseases and cancer.

The laureates will divide a monetary award worth 11m Swedish kronor.

Decisive Findings

"Their research has been decisive for understanding how the immune system functions and the reason we don't all develop serious self-attack conditions," stated the chair of the award panel.

This trio's studies address a core question: In what way does the defense system defend us from numerous infections while keeping our own tissues unharmed?

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

These cells employ sensors—known as receptors—that are produced randomly in a vast number of variations.

That gives the immune system the ability to fight a wide array of threats, but the randomness of the mechanism unavoidably creates white blood cells that may attack the host.

Security Guards of the Immune System

Researchers earlier knew that some of these problematic white blood cells were eliminated in the thymus—the site where white blood cells mature.

The latest Nobel Prize recognizes the discovery of regulatory T-cells—described as the body's "security guards"—which patrol the system to disarm any immune cells that assault the body's own tissues.

It is known that this process fails in autoimmune diseases such as juvenile diabetes, multiple sclerosis, and RA.

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

In cancer, T-regs prevent the body from attacking the tumor, so studies are focused on lowering their quantity.

In self-attack disorders, trials are testing increasing T-reg cells so the organism is no longer under attack. A similar approach could also be useful in reducing the risks of organ transplant rejection.

Innovative Experiments

Professor Shimon Sakaguchi, of Osaka University, performed tests on rodents that had their thymus extracted, leading to autoimmune disease.

The researcher showed that introducing defense cells from healthy mice could stop the disease—implying there was a mechanism for preventing immune cells from harming the body.

Dr. Brunkow, from the Institute for Systems Biology in a US city, and Fred Ramsdell, currently at a biotech firm in San Francisco, were studying an inherited autoimmune disease in mice and humans that resulted in the discovery of a gene critical for the way regulatory T-cells operate.

"The groundbreaking research has uncovered how the immune system is controlled by regulatory T cells, stopping it from mistakenly attacking the healthy cells," said a prominent biological science specialist.

"The research is a striking illustration of how fundamental physiological research can have far-reaching implications for public health."