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The Nobel Prize in medical science has been granted for revolutionary discoveries that clarify how the immune system attacks harmful pathogens while sparing the body's own cells.

A trio of esteemed researchers—from Japan Prof. Sakaguchi and American experts Mary Brunkow and Fred Ramsdell—share this honor.

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

These discoveries are now enabling innovative treatments for autoimmune diseases and malignancies.

These laureates will share a monetary award worth 11m Swedish kronor.

Crucial Discoveries

"The work has been decisive for understanding how the immune system operates and the reason we do not all develop severe autoimmune diseases," stated the head of the Nobel Committee.

This trio's research address a fundamental mystery: In what way does the immune system protect us from countless invaders while keeping our healthy cells unharmed?

Our immune system employs white blood cells that search for indicators of infection, including viruses and bacteria it has never encountered.

Such cells utilize detectors—called recognition units—that are generated randomly in a vast number of variations.

This provides the defense network the ability to combat a broad range of invaders, but the unpredictability of the mechanism unavoidably produces immune cells that can attack the host.

Security Guards of the Body

Researchers previously knew that a portion of these problematic defense cells were destroyed in the immune organ—the site where immune cells mature.

This year's Nobel Prize recognizes the identification of regulatory T-cells—known as the body's "peacekeepers"—which patrol the system to neutralize other immune cells that assault the body's own tissues.

We know that this mechanism fails in self-attack conditions such as type-1 diabetes, multiple sclerosis, and rheumatoid arthritis.

A prize committee stated, "These findings have established a new field of investigation and spurred the creation of new treatments, for instance for cancer and immune disorders."

Regarding malignancies, regulatory T-cells prevent the system from attacking the growth, so research are focused on reducing their numbers.

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

Innovative Studies

Professor Shimon Sakaguchi, of Osaka University, conducted experiments on mice that had their immune gland extracted, causing self-attack conditions.

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

Dr. Brunkow, affiliated with the a research center in Seattle, and Dr. Ramsdell, currently at Sonoma Biotherapeutics in a California city, were studying an inherited immune disorder in rodents and humans that resulted in the identification of a genetic factor vital for how T-regs operate.

"The pioneering research has uncovered how the body's defenses is controlled by T-reg cells, stopping it from mistakenly targeting the healthy cells," commented a prominent physiology expert.

"This research is a striking illustration of how fundamental physiological study can have broad consequences for human health."