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The prestigious award in Physiology or Medicine was awarded for revolutionary findings that clarify how the body's defense network targets harmful infections while sparing the healthy tissues.

Three esteemed scientists—Japan's Prof. Sakaguchi and US experts Dr. Brunkow and Fred Ramsdell—share this accolade.

The research identified specialized "sentinels" within the defense system that eliminate malfunctioning defense cells capable of attacking the body.

These discoveries are now paving the way for new therapies for immune disorders and cancer.

The laureates will share a monetary award worth 11 million Swedish kronor.

Decisive Findings

"The work has been essential for comprehending how the immune system operates and the reason we do not all develop serious autoimmune diseases," stated the chair of the Nobel Committee.

The team's studies address a fundamental question: How does the defense system defend us from numerous infections while leaving our own tissues intact?

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

Such defenders employ sensors—known as recognition units—that are produced randomly in countless variations.

That provides the immune system the ability to combat a wide array of invaders, but the unpredictability of the mechanism unavoidably produces white blood cells that may target the host.

Security Guards of the Body

Scientists earlier knew that some of these problematic white blood cells were eliminated in the immune organ—the site where white blood cells mature.

This year's award honors the identification of regulatory T-cells—known as the body's "peacekeepers"—which patrol the body to neutralize any immune cells that attack the body's own tissues.

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

The Nobel panel added, "The discoveries have laid the foundation for a novel area of investigation and accelerated the creation of new treatments, for example for tumors and immune disorders."

In cancer, regulatory T-cells block the system from fighting the tumor, so research are focused on reducing their quantity.

For self-attack disorders, trials are testing increasing regulatory T-cells so the body is not being harmed. A comparable method could also be effective in minimizing the risks of transplanted organ failure.

Innovative Studies

Prof Sakaguchi, of Osaka University, performed tests on rodents that had their immune gland removed, leading to autoimmune disease.

He demonstrated that introducing defense cells from healthy mice could prevent the disease—suggesting there was a system for blocking defenders from attacking the host.

Mary Brunkow, from the Institute for Systems Biology in a US city, 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 critical for the way regulatory T-cells function.

"Their pioneering work has revealed how the body's defenses is controlled by T-reg cells, stopping it from accidentally targeting the healthy cells," commented a prominent physiology specialist.

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