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This year's Nobel Prize in Physiology or Medicine was granted for transformative findings that illuminate how the immune system attacks dangerous infections while sparing the healthy tissues.

A trio of esteemed researchers—Japan's Prof. Sakaguchi and US scientists Mary Brunkow and Fred Ramsdell—received this accolade.

The research uncovered unique "security guards" within the immune system that remove malfunctioning defense cells that could harming the organism.

These findings are now paving the way for innovative therapies for immune disorders and malignancies.

The laureates will share a monetary award worth 11 million SEK.

Decisive Findings

"Their work has been decisive for understanding how the immune system functions and why we don't all suffer from serious self-attack conditions," commented the chair of the award panel.

The trio's studies explain a fundamental question: How does the defense system protect us from countless infections while leaving our healthy cells unharmed?

The immune system employs white blood cells that search for indicators of disease, even pathogens and bacteria it has never encountered.

These defenders utilize detectors—called recognition units—that are generated by chance in a vast number of combinations.

That provides the immune system the capacity to fight a wide array of invaders, but the unpredictability of the process inevitably creates white blood cells that can target the host.

Protectors of the Body

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

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

We know that this process malfunctions in autoimmune diseases such as type-1 diabetes, MS, and RA.

A prize committee added, "These findings have laid the foundation for a new field of investigation and spurred the creation of innovative treatments, for example for tumors and immune disorders."

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

For autoimmune diseases, experiments are testing boosting regulatory T-cells so the organism is no longer being harmed. A comparable method could also be useful in minimizing the risks of transplanted organ rejection.

Innovative Experiments

Prof Shimon Sakaguchi, of a Japanese institution, performed tests on mice that had their thymus removed, causing autoimmune disease.

He showed that introducing immune cells from healthy animals could prevent the illness—suggesting there was a system for preventing defenders from attacking the body.

Mary Brunkow, affiliated with the Institute for Systems Biology in a US city, and Dr. Ramsdell, now at a biotech firm in San Francisco, were studying an inherited autoimmune disease in rodents and humans that resulted in the identification of a genetic factor critical for how regulatory T-cells function.

"Their pioneering work has revealed how the body's defenses is kept in check by regulatory T cells, preventing it from accidentally attacking the body's own tissues," said a prominent biological science expert.

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