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This year's prestigious award in Physiology or Medicine has been awarded for transformative findings that clarify how the immune system attacks dangerous pathogens while sparing the body's own cells.

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

The work uncovered specialized "sentinels" within the immune system that eliminate rogue defense cells capable of harming the body.

These findings are now paving the way for innovative treatments for autoimmune diseases and malignancies.

These laureates will divide a prize fund valued at 11m Swedish kronor.

Crucial Discoveries

"The research has been decisive for comprehending how the immune system functions and the reason we don't all suffer from severe self-attack conditions," commented the chair of the award panel.

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

Our immune system employs white blood cells that search for signs of infection, even pathogens and bacteria it has not met before.

These cells employ detectors—known as receptors—that are generated by chance in countless combinations.

That provides the immune system the ability to fight a broad range of threats, but the randomness of the process inevitably produces white blood cells that may target the host.

Protectors of the Immune System

Researchers earlier understood that some of these harmful defense cells were destroyed in the thymus—the site where white blood cells mature.

The latest award honors the identification of T-reg cells—known as the immune system's "peacekeepers"—which travel through the system to disarm other defenders that attack the healthy cells.

We know that this process fails in self-attack conditions such as juvenile diabetes, multiple sclerosis, and RA.

The Nobel panel added, "These discoveries have laid the foundation for a novel area of research and spurred the creation of innovative therapies, for instance for tumors and autoimmune diseases."

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

For autoimmune diseases, experiments are exploring increasing T-reg cells so the body is not being harmed. A comparable approach could also be effective in reducing the risks of transplanted organ failure.

Innovative Studies

Prof Shimon Sakaguchi, from Osaka University, performed experiments on rodents that had their immune gland removed, causing autoimmune disease.

He showed that injecting defense cells from other mice could stop the disease—suggesting there was a system for preventing defenders from attacking the host.

Dr. Brunkow, affiliated with the a research center in a US city, and Fred Ramsdell, currently at Sonoma Biotherapeutics in a California city, were investigating an inherited immune disorder in rodents and humans that resulted in the discovery of a genetic factor vital for the way regulatory T-cells function.

"Their groundbreaking research has revealed how the body's defenses is kept in check by regulatory T cells, preventing it from accidentally targeting the healthy cells," commented a prominent physiology expert.

"This work is a remarkable example of how basic physiological research can have far-reaching implications for public health."