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The Nobel Prize in medical science has been granted for transformative discoveries that illuminate how the immune system targets harmful infections while protecting the healthy tissues.

Three esteemed scientists—from Japan Shimon Sakaguchi and American scientists Mary Brunkow and Fred Ramsdell—share this accolade.

Their research identified unique "sentinels" within the defense system that remove malfunctioning defense cells capable of attacking the organism.

The discoveries are now paving the way for innovative treatments for immune disorders and cancer.

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

Crucial Findings

"The work has been decisive for understanding how the immune system operates and why we don't all develop serious self-attack conditions," commented the chair of the Nobel Committee.

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

Our body's protection system employs white blood cells that search for indicators of infection, even viruses and germs it has never encountered.

These defenders employ sensors—called recognition units—that are generated by chance in a vast number of variations.

That gives the defense network the ability to combat a broad range of invaders, but the randomness of the process unavoidably creates white blood cells that can target the body.

Protectors of the Immune System

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

This year's award honors the discovery of T-reg cells—known as the immune system's "peacekeepers"—which patrol the system to neutralize other defenders that attack the body's own tissues.

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

The Nobel panel added, "The findings have established a novel area of research and spurred the development of new therapies, for example for tumors and immune disorders."

Regarding cancer, regulatory T-cells block the body from fighting the tumor, so studies are aimed at reducing their quantity.

For self-attack disorders, experiments are exploring increasing T-reg cells so the body is no longer under attack. A comparable approach could also be effective in minimizing the risks of transplanted organ failure.

Pioneering Studies

Prof Shimon Sakaguchi, from Osaka University, conducted tests on mice that had their thymus removed, leading to self-attack conditions.

He demonstrated that injecting defense cells from other mice could prevent the illness—implying there was a system for preventing immune cells from attacking the host.

Mary Brunkow, affiliated with the a research center in Seattle, and Dr. Ramsdell, currently at a biotech firm in San Francisco, were studying an inherited immune disorder in rodents and people that led to the discovery of a gene critical for how T-regs operate.

"Their pioneering work has revealed how the body's defenses is kept in check by T-reg cells, preventing it from accidentally targeting the healthy cells," commented a leading biological science specialist.

"This work is a remarkable illustration of how fundamental biological study can have broad implications for public health."