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The prestigious award in medical science was awarded for transformative findings that illuminate how the immune system targets dangerous infections while sparing the body's own cells.

Three esteemed researchers—Japan's Prof. Sakaguchi and US experts Dr. Brunkow and Fred Ramsdell—received this accolade.

Their work identified specialized "security guards" within the defense system that eliminate malfunctioning immune cells that could harming the body.

These findings are now enabling new treatments for autoimmune diseases and cancer.

These laureates will divide a prize fund worth 11m SEK.

Decisive Findings

"Their research has been essential for comprehending how the body's defenses functions and the reason we don't all suffer from serious self-attack conditions," commented the chair of the award panel.

This team's research address a core question: How does the defense system defend us from countless infections while keeping our own tissues unharmed?

The immune system employs white blood cells that search for signs of infection, even viruses and bacteria it has never encountered.

These cells utilize sensors—known as receptors—that are generated randomly in countless variations.

That provides the defense network the ability to fight a wide array of invaders, but the unpredictability of the process unavoidably creates white blood cells that may target the body.

Security Guards of the Immune System

Researchers earlier knew that some of these harmful white blood cells were destroyed in the thymus—where white blood cells mature.

The latest award recognizes the discovery of regulatory T-cells—known as the body'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 juvenile diabetes, MS, and rheumatoid arthritis.

A Nobel panel added, "The discoveries have laid the foundation for a new field of investigation and accelerated the creation of innovative treatments, for example for cancer and immune disorders."

In malignancies, T-regs block the body from attacking the growth, so studies are aimed at lowering their numbers.

For autoimmune diseases, trials are exploring boosting T-reg cells so the organism is not under attack. A comparable method could also be useful in reducing the chances of transplanted organ rejection.

Innovative Studies

Professor Sakaguchi, from Osaka University, performed experiments on mice that had their immune gland extracted, leading to self-attack conditions.

The researcher showed that introducing immune cells from other animals could prevent the disease—implying there was a mechanism for blocking defenders from harming the body.

Mary Brunkow, from the Institute for Systems Biology in Seattle, and Fred Ramsdell, currently at Sonoma Biotherapeutics in San Francisco, were studying an inherited immune disorder in rodents and humans that led to the identification of a gene vital for the way regulatory T-cells operate.

"Their pioneering work has uncovered how the body's defenses is controlled by regulatory T cells, preventing it from mistakenly targeting the healthy cells," commented a leading physiology expert.

"The research is a striking example of how basic physiological research can have broad implications for public health."