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The prestigious award in Physiology or Medicine was granted for revolutionary findings that clarify how the immune system targets dangerous pathogens while sparing the body's own cells.

Three renowned researchers—from Japan Prof. Sakaguchi and US scientists Mary Brunkow and Dr. Ramsdell—share this accolade.

The research uncovered specialized "security guards" within the defense system that eliminate malfunctioning defense cells that could harming the body.

These discoveries are now enabling innovative therapies for immune disorders and cancer.

The laureates will divide a monetary award valued at 11 million SEK.

Decisive Findings

"The work has been essential for understanding how the immune system operates and the reason we do not all develop serious self-attack conditions," stated the head of the Nobel Committee.

The trio's research explain a core mystery: In what way does the immune system protect us from numerous invaders while keeping our healthy cells unharmed?

Our body's protection system uses immune cells that search for signs of disease, even pathogens and bacteria it has never encountered.

Such defenders utilize sensors—called receptors—that are generated randomly in countless variations.

This gives the defense network the capacity to combat a broad range of threats, but the unpredictability of the mechanism unavoidably produces white blood cells that can attack the host.

Security Guards of the Body

Researchers earlier understood that a portion of these problematic defense cells were eliminated in the immune organ—where immune cells mature.

The latest award recognizes the discovery of T-reg cells—known as the immune system's "security guards"—which patrol the system to neutralize any defenders that assault the healthy cells.

We know that this process malfunctions in autoimmune diseases such as juvenile diabetes, MS, and RA.

A prize committee stated, "These discoveries have laid the foundation for a new field of investigation and spurred the development of new therapies, for example for cancer and autoimmune diseases."

Regarding malignancies, regulatory T-cells prevent the body from fighting the tumor, so research are focused on lowering their numbers.

In autoimmune diseases, experiments are testing increasing T-reg cells so the body is not under attack. A comparable approach could also be effective in reducing the chances of transplanted organ failure.

Pioneering Experiments

Prof Shimon Sakaguchi, of a Japanese institution, performed experiments on mice that had their immune gland removed, leading to self-attack conditions.

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

Mary Brunkow, from the a research center in a US city, and Dr. Ramsdell, now at Sonoma Biotherapeutics in a California city, were studying an genetic immune disorder in rodents and people that resulted in the discovery of a genetic factor vital for how regulatory T-cells operate.

"The groundbreaking work has uncovered how the body's defenses is kept in check by T-reg cells, preventing it from accidentally targeting the body's own tissues," said a prominent biological science specialist.

"The research is a remarkable example of how fundamental physiological study can have broad consequences for public health."