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The Nobel Prize in Physiology or Medicine has been granted for transformative findings that illuminate how the body's defense network targets harmful infections while protecting the body's own cells.

A trio of renowned researchers—from Japan Prof. Sakaguchi and US experts Mary Brunkow and Dr. Ramsdell—received this accolade.

Their research identified specialized "security guards" within the immune system that eliminate malfunctioning immune cells that could attacking the organism.

The discoveries are now enabling new therapies for immune disorders and cancer.

The winners will divide a monetary award valued at 11m Swedish kronor.

Decisive Discoveries

"The research has been essential for comprehending how the body's defenses functions and the reason we do not all develop severe self-attack conditions," commented the chair of the Nobel Committee.

The team's studies address a fundamental mystery: In what way does the defense system protect us from countless infections while keeping our own tissues intact?

Our immune system uses immune cells that scan for signs of infection, including pathogens and germs it has not met before.

Such defenders employ detectors—known as receptors—that are generated by chance in countless combinations.

This provides the immune system the capacity to combat a broad range of invaders, but the randomness of the process inevitably produces white blood cells that may target the host.

Protectors of the Body

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

This year's award honors the identification of regulatory T-cells—described as the body's "security guards"—which patrol the body to neutralize other immune cells that attack the body's own tissues.

It is known that this mechanism malfunctions in self-attack conditions such as type-1 diabetes, MS, and rheumatoid arthritis.

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

In malignancies, T-regs prevent the body from attacking the growth, so research are focused on reducing their numbers.

For autoimmune diseases, experiments are testing increasing T-reg cells so the body is not under attack. A comparable method could also be effective in minimizing the risks of organ transplant rejection.

Innovative Experiments

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

The researcher showed that injecting defense cells from other animals could stop the disease—implying there was a system for preventing defenders from attacking the host.

Dr. Brunkow, affiliated with the Institute for Systems Biology in Seattle, and Fred Ramsdell, currently at Sonoma Biotherapeutics in a California city, were studying an genetic immune disorder in mice and people that led to the discovery of a genetic factor vital for how regulatory T-cells function.

"The groundbreaking work has revealed how the body's defenses is kept in check by T-reg cells, preventing it from mistakenly attacking the body's own tissues," commented a prominent biological science expert.

"This research is a remarkable illustration of how basic biological research can have far-reaching consequences for public health."