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The prestigious award in Physiology or Medicine was granted for transformative findings that illuminate how the immune system attacks harmful pathogens while sparing the body's own cells.

Three renowned scientists—Japan's Prof. Sakaguchi and US experts Mary Brunkow and Dr. Ramsdell—share this honor.

The research uncovered specialized "security guards" within the defense system that remove rogue immune cells that could attacking the body.

These discoveries are now paving the way for innovative therapies for immune disorders and cancer.

The winners will divide a prize fund worth 11 million SEK.

Crucial Findings

"Their work has been decisive for comprehending how the immune system functions and why we do not all suffer from severe autoimmune diseases," stated the head of the award panel.

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

The body's protection system uses immune cells that scan for indicators of disease, including pathogens and germs it has not met before.

These cells utilize sensors—called recognition units—that are produced randomly in a vast number of combinations.

This provides the defense network the ability to combat a wide array of threats, but the unpredictability of the mechanism inevitably creates immune cells that can target the body.

Security Guards of the Body

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

The latest award recognizes the discovery of regulatory T-cells—described as the immune system's "peacekeepers"—which patrol the body to disarm other defenders that assault the body's own tissues.

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

The Nobel panel stated, "The discoveries have established a novel area of investigation and spurred the development of new treatments, for instance for cancer and autoimmune diseases."

Regarding cancer, regulatory T-cells block the system from attacking the growth, so studies are aimed at reducing their numbers.

In self-attack disorders, experiments are testing increasing T-reg cells so the body is not under attack. A comparable method could also be effective in reducing the risks of organ transplant rejection.

Innovative Experiments

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

He showed that introducing immune cells from other animals could stop the disease—suggesting there was a mechanism for blocking immune cells from harming the host.

Dr. Brunkow, from the a research center in Seattle, and Fred Ramsdell, currently at a biotech firm in San Francisco, were investigating an inherited autoimmune disease in mice and humans that led to the discovery of a gene vital for the way regulatory T-cells operate.

"Their groundbreaking work has uncovered how the body's defenses is kept in check by T-reg cells, preventing it from accidentally targeting the healthy cells," commented a prominent biological science expert.

"The research is a striking illustration of how basic biological research can have far-reaching consequences for public health."