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This year's prestigious award in Physiology or Medicine was awarded for transformative discoveries that clarify how the body's defense network attacks dangerous infections while protecting the healthy tissues.

A trio of esteemed researchers—Japan's Shimon Sakaguchi and US scientists Mary Brunkow and Dr. Ramsdell—share this honor.

The research uncovered unique "security guards" within the defense system that eliminate malfunctioning immune cells capable of harming the body.

These discoveries are now paving the way for new treatments for autoimmune diseases and malignancies.

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

Decisive Discoveries

"The work has been essential for understanding how the body's defenses functions and the reason we don't all develop serious autoimmune diseases," stated the head of the award panel.

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

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

Such cells utilize sensors—known as recognition units—that are produced randomly in countless variations.

That provides the defense network the capacity to fight a broad range of threats, but the randomness of the process inevitably creates white blood cells that can attack the host.

Protectors of the Body

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

The latest Nobel Prize honors the discovery of regulatory T-cells—described as the immune system's "security guards"—which travel through the system to disarm other defenders that assault the body's own tissues.

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

A Nobel panel added, "These discoveries have established a new field of research and spurred the creation of innovative therapies, for instance for cancer and autoimmune diseases."

Regarding malignancies, T-regs prevent the body from fighting the growth, so research are aimed at lowering their quantity.

For self-attack disorders, experiments are testing increasing regulatory T-cells so the organism is no longer being harmed. A similar method could also be effective in minimizing the chances of transplanted organ failure.

Innovative Experiments

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

He showed that injecting immune cells from other mice could stop the illness—suggesting there was a system for blocking defenders from attacking the host.

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

"The pioneering work has uncovered how the body's defenses is controlled by T-reg cells, preventing it from accidentally targeting the healthy cells," said a prominent physiology specialist.

"This work is a remarkable illustration of how basic biological research can have far-reaching implications for human health."