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This year's prestigious award in Physiology or Medicine was granted for revolutionary findings that clarify how the body's defense network targets harmful infections while sparing the body's own cells.

Three esteemed researchers—from Japan Prof. Sakaguchi and American scientists Mary Brunkow and Dr. Ramsdell—share this honor.

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

The discoveries are now enabling innovative treatments for autoimmune diseases and malignancies.

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

Crucial Findings

"The research has been essential for comprehending how the immune system operates and the reason we don't all suffer from serious autoimmune diseases," commented the head of the award panel.

This trio's research explain a core mystery: How does the defense system defend us from countless infections while leaving our own tissues intact?

The body's protection system uses white blood cells that scan for indicators of infection, even viruses and bacteria it has never encountered.

Such cells utilize sensors—known as recognition units—that are generated randomly in countless combinations.

That provides the defense network the ability to fight a broad range of invaders, but the unpredictability of the mechanism unavoidably produces immune cells that may attack the host.

Security Guards of the Body

Scientists earlier understood that some of these problematic white blood cells were eliminated in the immune organ—where immune cells develop.

The latest award honors the identification of regulatory T-cells—known as the immune system's "security guards"—which patrol the system to disarm any immune cells that assault the healthy cells.

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

The prize committee stated, "The findings have laid the foundation for a novel area of investigation and accelerated the development of innovative therapies, for example for cancer and autoimmune diseases."

Regarding cancer, regulatory T-cells block the body from fighting the tumor, so studies are focused on reducing their quantity.

For self-attack disorders, trials are exploring increasing regulatory T-cells so the organism is no longer under attack. A similar method could also be useful in reducing the risks of organ transplant failure.

Pioneering Experiments

Prof Sakaguchi, of Osaka University, conducted tests on rodents that had their thymus extracted, leading to self-attack conditions.

He demonstrated that introducing immune cells from healthy mice could stop the illness—implying there was a mechanism for preventing immune cells from harming the host.

Mary Brunkow, from the Institute for Systems Biology in a US city, and Dr. Ramsdell, now at Sonoma Biotherapeutics in a California city, were investigating an inherited autoimmune disease in mice and humans that resulted in the discovery of a genetic factor vital for the way T-regs function.

"The pioneering research has uncovered how the immune system is controlled by T-reg cells, stopping it from mistakenly attacking the healthy cells," commented a prominent physiology expert.

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