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The prestigious award in Physiology or Medicine was awarded for transformative discoveries that clarify how the immune system targets dangerous infections while sparing the body's own cells.

A trio of renowned scientists—from Japan Shimon Sakaguchi and US scientists Dr. Brunkow and Dr. Ramsdell—received this honor.

The research uncovered unique "sentinels" within the immune system that eliminate rogue immune cells that could harming the body.

These findings are now enabling innovative therapies for autoimmune diseases and cancer.

The winners will divide a monetary award worth 11m SEK.

Decisive Findings

"The work has been decisive for comprehending how the body's defenses functions and the reason we do not all suffer from severe self-attack conditions," commented the head of the Nobel Committee.

This team's studies address a fundamental mystery: In what way does the defense system protect us from numerous invaders while leaving our healthy cells intact?

The immune system uses immune cells that scan for signs of infection, including pathogens and germs it has never encountered.

These cells utilize sensors—called receptors—that are generated randomly in a vast number of combinations.

This provides the immune system the capacity to combat a wide array of invaders, but the unpredictability of the process inevitably produces white blood cells that can attack the host.

Security Guards of the Immune System

Researchers previously knew that some of these harmful defense cells were destroyed in the immune organ—where immune cells develop.

The latest award honors the discovery of T-reg cells—known as the body's "security guards"—which patrol the system to disarm other immune cells that attack the healthy cells.

It is known that this process fails in self-attack conditions such as type-1 diabetes, multiple sclerosis, and RA.

The Nobel panel stated, "These findings have laid the foundation for a novel area of research and accelerated the creation of new therapies, for example for cancer and immune disorders."

Regarding malignancies, regulatory T-cells prevent the body from attacking the growth, so studies are aimed at reducing their quantity.

For self-attack disorders, trials are exploring boosting T-reg cells so the organism is no longer under attack. A similar method could also be effective in reducing the risks of transplanted organ failure.

Innovative Experiments

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

He demonstrated that introducing defense cells from healthy mice could prevent the disease—implying 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 studying an genetic autoimmune disease in mice and humans that led to the identification of a gene critical for how regulatory T-cells operate.

"Their groundbreaking research has revealed how the body's defenses is controlled by T-reg cells, preventing it from mistakenly targeting the body's own tissues," commented a prominent physiology specialist.

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