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The Nobel Prize in Physiology or Medicine has been granted for revolutionary discoveries that illuminate how the immune system attacks harmful pathogens while sparing the healthy tissues.

A trio of renowned researchers—Japan's Prof. Sakaguchi and American experts Mary Brunkow and Fred Ramsdell—received this accolade.

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

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

These laureates will share a monetary award valued at 11 million SEK.

Decisive Findings

"The research has been essential for comprehending how the body's defenses operates and the reason we do not all suffer from serious autoimmune diseases," stated the head of the Nobel Committee.

This team's studies explain a core mystery: How does the immune system defend us from countless infections while keeping our own tissues intact?

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

These cells employ sensors—known as recognition units—that are generated randomly in a vast number of variations.

That provides the immune system the ability to fight a wide array of invaders, but the randomness of the mechanism unavoidably creates white blood cells that can target the host.

Security Guards of the Immune System

Scientists previously understood that some of these problematic white blood cells were destroyed in the thymus—the site where white blood cells mature.

The latest award recognizes the identification of regulatory T-cells—known as the body's "peacekeepers"—which travel through the body to disarm any defenders that attack the body's own tissues.

We know that this process malfunctions in self-attack conditions such as type-1 diabetes, MS, and rheumatoid arthritis.

A prize committee stated, "The findings have laid the foundation for a new field of investigation and spurred the creation of innovative treatments, for example for cancer and autoimmune diseases."

Regarding malignancies, T-regs prevent the body from fighting the growth, so studies are focused on lowering their numbers.

In self-attack disorders, experiments are exploring increasing regulatory T-cells so the organism is not being harmed. A similar method could also be useful in reducing the chances of organ transplant failure.

Pioneering Studies

Prof Sakaguchi, of Osaka University, performed experiments on rodents that had their thymus removed, leading to self-attack conditions.

He showed that introducing defense cells from healthy animals could stop the illness—implying there was a system for preventing immune cells from attacking the host.

Mary Brunkow, from the Institute for Systems Biology in a US city, and Fred Ramsdell, currently at Sonoma Biotherapeutics in a California city, were studying an inherited autoimmune disease in mice and people that resulted in the discovery of a gene critical for how T-regs function.

"Their groundbreaking research has revealed how the immune system is kept in check by T-reg cells, preventing it from accidentally targeting the body's own tissues," commented a prominent biological science expert.

"This research is a striking illustration of how fundamental biological research can have far-reaching implications for human health."