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This year's prestigious award in medical science was awarded for transformative findings that clarify how the body's defense network targets harmful infections while protecting the body's own cells.

A trio of esteemed scientists—from Japan Prof. Sakaguchi and US experts Dr. Brunkow and Dr. Ramsdell—received this accolade.

The research identified specialized "sentinels" within the defense system that remove malfunctioning immune cells capable of attacking the organism.

These findings are now enabling new treatments for autoimmune diseases and cancer.

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

Crucial Findings

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

The team's studies address a core mystery: In what way does the defense system protect us from countless invaders while leaving our own tissues unharmed?

Our body's protection system uses white blood cells that search for signs of infection, even viruses and germs it has not met before.

Such cells employ sensors—called receptors—that are generated randomly in countless variations.

This gives the immune system the capacity to combat a wide array of threats, but the randomness of the process inevitably creates white blood cells that can attack the body.

Protectors of the Immune System

Researchers earlier understood that some of these harmful white blood cells were destroyed in the immune organ—where white blood cells mature.

The latest Nobel Prize recognizes the identification of regulatory T-cells—known as the immune system's "security guards"—which travel through the system to neutralize any immune cells that assault the body's own tissues.

We know that this mechanism malfunctions in self-attack conditions such as type-1 diabetes, MS, and RA.

The prize committee added, "These discoveries have laid the foundation for a novel area of research and accelerated the creation of innovative treatments, for example for tumors and autoimmune diseases."

Regarding malignancies, regulatory T-cells block the system from attacking the tumor, so research are focused on reducing their quantity.

In self-attack disorders, trials are testing boosting T-reg cells so the organism is not under attack. A similar approach could also be effective in reducing the risks of transplanted organ rejection.

Innovative Experiments

Professor Sakaguchi, of a Japanese institution, performed experiments on rodents that had their thymus extracted, causing autoimmune disease.

The researcher showed that injecting immune cells from other animals could prevent the illness—implying there was a system for preventing immune cells from harming the host.

Mary Brunkow, affiliated with the Institute for Systems Biology in a US city, and Fred Ramsdell, now at a biotech firm in a California city, were studying an inherited immune disorder in rodents and humans that resulted in the discovery of a genetic factor vital for the way T-regs operate.

"The pioneering work has revealed how the immune system is controlled by T-reg cells, preventing it from accidentally targeting the healthy cells," said a leading physiology specialist.

"This research is a striking example of how fundamental physiological research can have far-reaching consequences for human health."