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This year's Nobel Prize in medical science was awarded for revolutionary discoveries that illuminate how the body's defense network attacks dangerous infections while sparing the body's own cells.

A trio of esteemed researchers—Japan's Shimon Sakaguchi and American experts Mary Brunkow and Dr. Ramsdell—received this accolade.

Their research identified unique "security guards" within the defense system that eliminate malfunctioning defense cells capable of attacking the body.

The discoveries are now enabling innovative therapies for immune disorders and malignancies.

The laureates will share a prize fund valued at 11m SEK.

Decisive Findings

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

This team's research address a core question: In what way does the defense system protect us from numerous infections while leaving our healthy cells unharmed?

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

Such cells utilize detectors—called receptors—that are generated by chance in a vast number of combinations.

This provides the immune system the ability to fight a wide array of invaders, but the randomness of the mechanism inevitably creates immune cells that can attack the body.

Security Guards of the Body

Researchers previously understood that a portion of these problematic white blood cells were destroyed in the immune organ—where white blood cells develop.

The latest Nobel Prize recognizes the discovery of T-reg cells—known as the body's "peacekeepers"—which patrol the system to disarm any immune cells that assault the healthy cells.

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

A prize committee stated, "These discoveries have laid the foundation for a novel area of research and spurred the development of innovative treatments, for instance for cancer and autoimmune diseases."

In cancer, T-regs prevent the body from attacking the tumor, so studies are focused on lowering their numbers.

For autoimmune diseases, trials are exploring boosting T-reg cells so the organism is no longer under attack. A comparable method could also be useful in minimizing the chances of transplanted organ failure.

Pioneering Experiments

Prof Shimon Sakaguchi, of Osaka University, conducted experiments on rodents that had their thymus extracted, causing self-attack conditions.

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

Mary Brunkow, from the a research center in a US city, and Fred Ramsdell, now at Sonoma Biotherapeutics in San Francisco, were studying an inherited immune disorder in mice and people that led to the discovery of a genetic factor critical for how regulatory T-cells operate.

"The groundbreaking work has uncovered how the body's defenses is controlled by T-reg cells, preventing it from accidentally attacking the healthy cells," said a prominent physiology specialist.

"The work is a remarkable example of how basic physiological study can have broad implications for human health."