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This year's Nobel Prize in medical science was awarded for transformative discoveries that illuminate how the body's defense network targets dangerous pathogens while sparing the healthy tissues.

Three esteemed scientists—Japan's Prof. Sakaguchi and American experts Mary Brunkow and Dr. Ramsdell—share this honor.

The research identified specialized "sentinels" within the immune system that eliminate malfunctioning immune cells that could harming the body.

The findings are now paving the way for new therapies for immune disorders and cancer.

These winners will share a monetary award worth 11m SEK.

Crucial Findings

"The research has been essential for understanding how the immune system functions and why we do not all suffer from severe self-attack conditions," commented the chair of the award panel.

The trio's research address a core question: How does the defense system defend us from countless invaders while leaving our own tissues intact?

The body's protection system uses immune cells that search for signs of disease, including viruses and bacteria it has never encountered.

These defenders utilize sensors—called receptors—that are generated by chance in countless combinations.

This provides the defense network the capacity to combat a wide array of invaders, but the unpredictability of the process unavoidably produces immune cells that can target the host.

Security Guards of the Body

Researchers earlier knew that a portion of these harmful defense cells were destroyed in the immune organ—where immune cells develop.

This year's Nobel Prize recognizes the discovery of T-reg cells—known as the body's "security guards"—which travel through the body to neutralize any immune cells that assault the body's own tissues.

It is known that this mechanism fails in autoimmune diseases such as juvenile diabetes, multiple sclerosis, and RA.

A prize committee added, "These discoveries have established a new field of research and spurred the development of innovative therapies, for instance for tumors and immune disorders."

In malignancies, T-regs prevent the system from attacking the growth, so research are focused on lowering their quantity.

For self-attack disorders, trials are exploring boosting T-reg cells so the body is not being harmed. A similar method could also be useful in reducing the chances of transplanted organ failure.

Pioneering Experiments

Prof Shimon Sakaguchi, of Osaka University, performed experiments on mice that had their thymus extracted, leading to autoimmune disease.

He demonstrated that injecting defense cells from other mice could prevent the disease—suggesting there was a mechanism for blocking defenders from attacking the host.

Dr. Brunkow, from the Institute for Systems Biology in Seattle, and Fred Ramsdell, currently at a biotech firm in a California city, were investigating an genetic immune disorder in rodents and humans that resulted in the identification of a genetic factor critical for the way T-regs function.

"The pioneering research has revealed how the immune system is controlled by regulatory T cells, preventing it from accidentally targeting the body's own tissues," said a leading physiology expert.

"The research is a striking illustration of how basic biological study can have broad consequences for public health."