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This year's Nobel Prize in Physiology or Medicine has been awarded for transformative findings that clarify how the body's defense network targets dangerous infections while sparing the body's own cells.

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

Their work identified unique "sentinels" within the defense system that eliminate malfunctioning immune cells capable of harming the body.

The findings are now paving the way for new treatments for immune disorders and malignancies.

The winners will divide a prize fund worth 11m Swedish kronor.

Crucial Findings

"Their research has been decisive for comprehending how the body's defenses functions and why we do not all suffer from serious self-attack conditions," commented the chair of the Nobel Committee.

The team's studies address a core question: In what way does the defense system protect us from countless infections while keeping our healthy cells unharmed?

The body's protection system uses white blood cells that search for indicators of disease, even viruses and germs it has never encountered.

Such defenders employ sensors—known as recognition units—that are produced randomly in countless combinations.

That provides the defense network the ability to combat a wide array of invaders, but the unpredictability of the mechanism unavoidably creates immune cells that can target the host.

Protectors of the Immune System

Researchers earlier knew that some of these problematic defense cells were eliminated in the immune organ—where white blood cells mature.

The latest Nobel Prize honors the identification of regulatory T-cells—known as the body's "peacekeepers"—which travel through the system to neutralize other immune cells that attack the healthy cells.

We know that this mechanism fails in autoimmune diseases such as type-1 diabetes, MS, and RA.

A prize committee stated, "The discoveries have established a novel area of investigation and spurred the creation of new therapies, for example for tumors and autoimmune diseases."

Regarding cancer, T-regs block the system from attacking the growth, so research are aimed at lowering their quantity.

For autoimmune diseases, trials are testing increasing regulatory T-cells so the body is not being harmed. A similar approach could also be useful in minimizing the chances of organ transplant rejection.

Innovative Experiments

Prof Shimon Sakaguchi, from Osaka University, performed experiments on mice that had their thymus removed, leading to self-attack conditions.

He showed that injecting immune cells from healthy animals could stop the disease—implying there was a mechanism for blocking defenders from attacking the host.

Dr. Brunkow, affiliated with the Institute for Systems Biology in Seattle, and Dr. Ramsdell, currently at Sonoma Biotherapeutics in a California city, were investigating an genetic immune disorder in mice and humans that led to the identification of a gene critical for how T-regs function.

"The pioneering work has revealed how the immune system is kept in check by regulatory T cells, preventing it from accidentally attacking the healthy cells," said a leading biological science specialist.

"The work is a remarkable example of how fundamental physiological study can have far-reaching consequences for public health."