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The prestigious award in Physiology or Medicine has been granted for revolutionary discoveries that clarify how the immune system attacks harmful infections while sparing the healthy tissues.

Three esteemed researchers—from Japan Shimon Sakaguchi and American scientists Dr. Brunkow and Dr. Ramsdell—share this accolade.

Their work uncovered unique "security guards" within the immune system that remove rogue defense cells that could harming the body.

The findings are now enabling innovative treatments for immune disorders and malignancies.

These laureates will share a prize fund worth 11m Swedish kronor.

Crucial Findings

"Their work has been decisive for comprehending how the body's defenses operates and the reason we don't all develop severe self-attack conditions," stated the chair of the award panel.

The team's research address a fundamental mystery: In what way does the defense system defend us from countless infections while leaving our own tissues unharmed?

Our body's protection system uses immune cells that search for signs of infection, even viruses and germs it has never encountered.

These cells employ detectors—called receptors—that are generated randomly in countless variations.

That provides the immune system the ability to combat a wide array of invaders, but the unpredictability of the mechanism unavoidably produces immune cells that may target the body.

Protectors of the Immune System

Scientists previously understood that some of these harmful white blood cells were eliminated in the immune organ—the site where white blood cells mature.

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

We know that this mechanism fails in self-attack conditions such as juvenile diabetes, multiple sclerosis, and RA.

A prize committee stated, "The discoveries have established a novel area of research and spurred the creation of new therapies, for instance for tumors and immune disorders."

Regarding malignancies, T-regs block the system from fighting the growth, so studies are focused on lowering their quantity.

In self-attack disorders, trials are exploring boosting regulatory T-cells so the organism is no longer being harmed. A similar method could also be useful in minimizing the risks of transplanted organ rejection.

Pioneering Experiments

Professor Sakaguchi, of Osaka University, conducted experiments on rodents that had their thymus extracted, causing autoimmune disease.

He demonstrated that injecting defense cells from other mice could stop the disease—implying there was a system for preventing immune cells from attacking the host.

Mary Brunkow, from the Institute for Systems Biology in a US city, and Fred Ramsdell, now at a biotech firm in San Francisco, were investigating an genetic autoimmune disease in rodents and humans that resulted in the identification of a gene vital for the way regulatory T-cells operate.

"The pioneering work has uncovered how the immune system is controlled by regulatory T cells, stopping it from mistakenly targeting the healthy cells," commented a prominent biological science specialist.

"This research is a striking example of how basic biological study can have far-reaching implications for public health."