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The Nobel Prize in medical science has been awarded for transformative findings that illuminate how the body's defense network attacks harmful pathogens while sparing the body's own cells.

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

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

These findings are now enabling innovative treatments for immune disorders and cancer.

These winners will divide a prize fund valued at 11m Swedish kronor.

Decisive Findings

"The research has been essential for comprehending how the immune system operates and why we do not all suffer from severe autoimmune diseases," commented the head of the Nobel Committee.

This team's studies explain a core mystery: In what way does the defense system defend us from countless invaders while leaving our healthy cells intact?

Our immune system employs white blood cells that search for indicators of disease, even pathogens and bacteria it has not met before.

Such cells utilize sensors—called receptors—that are produced by chance in countless combinations.

This gives the defense network the ability to combat a wide array of invaders, but the randomness of the mechanism inevitably produces immune cells that can target the host.

Protectors of the Immune System

Researchers previously knew that a portion of these harmful white blood cells were destroyed in the immune organ—where white blood cells mature.

The latest Nobel Prize recognizes the discovery of regulatory T-cells—described as the body's "peacekeepers"—which patrol the system to disarm any defenders that attack the body's own tissues.

We know that this mechanism malfunctions in self-attack conditions such as juvenile diabetes, multiple sclerosis, and rheumatoid arthritis.

A Nobel panel stated, "The discoveries have laid the foundation for a novel area of research and accelerated the creation of innovative treatments, for instance for tumors and immune disorders."

Regarding malignancies, T-regs block the body from fighting the growth, so studies are aimed at reducing their numbers.

In autoimmune diseases, experiments are exploring increasing T-reg cells so the body is not being harmed. A similar method could also be useful in minimizing the risks of organ transplant rejection.

Innovative Studies

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

He demonstrated that introducing defense cells from other mice could prevent the illness—suggesting there was a system for preventing immune cells from harming the body.

Mary Brunkow, from the Institute for Systems Biology in a US city, and Dr. Ramsdell, currently at a biotech firm in San Francisco, were studying an genetic immune disorder in mice and people that resulted in the discovery of a gene critical for the way T-regs operate.

"Their pioneering research has uncovered how the immune system is kept in check by regulatory T cells, stopping it from accidentally targeting the healthy cells," said a prominent physiology expert.

"The research is a striking illustration of how basic biological research can have broad implications for human health."