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The prestigious award in medical science was granted for transformative discoveries that clarify how the body's defense network attacks harmful infections while protecting the body's own cells.

A trio of esteemed scientists—from Japan Prof. Sakaguchi and American scientists Mary Brunkow and Fred Ramsdell—share this honor.

The research uncovered unique "sentinels" within the defense system that eliminate malfunctioning immune cells capable of attacking the body.

The findings are now paving the way for new therapies for immune disorders and cancer.

These winners will divide a prize fund valued at 11 million SEK.

Crucial Discoveries

"Their work has been essential for understanding how the body's defenses operates and why we do not all suffer from severe self-attack conditions," stated the head of the Nobel Committee.

This team's studies address a core question: How does the immune system defend us from numerous invaders while leaving our own tissues unharmed?

Our immune system uses immune cells that search for signs of infection, even pathogens and bacteria it has never encountered.

Such defenders utilize detectors—known as recognition units—that are produced randomly in a vast number of variations.

This gives the defense network the capacity to fight a broad range of invaders, but the unpredictability of the mechanism unavoidably produces immune cells that may target the body.

Security Guards of the Body

Researchers previously understood that some of these harmful defense cells were eliminated in the thymus—where white blood cells develop.

The latest award honors the identification of T-reg cells—known as the immune system's "security guards"—which patrol the system to neutralize any defenders that assault the body's own tissues.

It is known that this process malfunctions in autoimmune diseases such as type-1 diabetes, multiple sclerosis, and rheumatoid arthritis.

A Nobel panel added, "These discoveries have laid the foundation for a novel area of research and spurred the creation of new therapies, for instance for tumors and immune disorders."

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

In autoimmune diseases, trials are exploring boosting T-reg cells so the body is not under attack. A comparable approach could also be effective in reducing the risks of organ transplant failure.

Innovative Studies

Prof Sakaguchi, of a Japanese institution, performed tests on rodents that had their thymus removed, leading to self-attack conditions.

He demonstrated that introducing defense cells from other animals could stop the disease—suggesting there was a mechanism for preventing immune cells from harming the body.

Mary Brunkow, affiliated with the Institute for Systems Biology in a US city, and Fred Ramsdell, now at Sonoma Biotherapeutics in San Francisco, were investigating an genetic immune disorder in rodents and humans that led to the discovery of a gene critical for how T-regs operate.

"The groundbreaking research has revealed how the body's defenses is controlled by T-reg cells, stopping it from accidentally attacking the healthy cells," commented a leading physiology expert.

"This research is a remarkable example of how fundamental physiological study can have far-reaching consequences for human health."