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The Nobel Prize in Physiology or Medicine was awarded for transformative findings that illuminate how the body's defense network targets dangerous pathogens while sparing the body's own cells.

A trio of esteemed scientists—from Japan Shimon Sakaguchi and US experts Mary Brunkow and Fred Ramsdell—share this honor.

The work identified specialized "sentinels" within the defense system that remove malfunctioning immune cells that could harming the body.

These discoveries are now enabling new therapies for autoimmune diseases and malignancies.

The laureates will divide a prize fund valued at 11 million SEK.

Crucial Discoveries

"The research has been essential for comprehending how the body's defenses operates and why we do not all suffer from serious self-attack conditions," commented the head of the Nobel Committee.

The team's research explain a fundamental question: In what way does the immune system defend us from numerous invaders while keeping our healthy cells intact?

The body's protection system employs immune cells that search for indicators of disease, even pathogens and bacteria it has not met before.

Such defenders utilize sensors—known as receptors—that are produced randomly in countless combinations.

This provides the defense network the ability to combat a broad range of invaders, but the unpredictability of the mechanism inevitably produces white blood cells that may attack the host.

Protectors of the Immune System

Researchers previously understood that a portion of these harmful defense cells were destroyed in the immune organ—the site where immune cells mature.

This year's Nobel Prize recognizes the identification of T-reg cells—known as the immune system's "peacekeepers"—which travel through the system to disarm other immune cells that attack the body's own tissues.

We know that this mechanism malfunctions in self-attack conditions such as juvenile diabetes, MS, and rheumatoid arthritis.

The Nobel panel added, "These discoveries have established a novel area of research and accelerated the development of innovative therapies, for instance for tumors and immune disorders."

In cancer, T-regs prevent the body from attacking the growth, so research are aimed at lowering their numbers.

For autoimmune diseases, trials are exploring increasing regulatory T-cells so the organism is not being harmed. A similar approach could also be effective in minimizing the risks of organ transplant rejection.

Pioneering Experiments

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

He demonstrated that injecting defense cells from healthy animals could stop the illness—implying there was a mechanism for preventing immune cells from attacking the body.

Dr. Brunkow, affiliated with the Institute for Systems Biology in Seattle, and Fred Ramsdell, currently at a biotech firm in San Francisco, were studying an inherited immune disorder in rodents and humans that led to the discovery 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 T-reg cells, stopping it from accidentally attacking the body's own tissues," commented a prominent physiology specialist.

"The work is a remarkable example of how fundamental biological study can have far-reaching consequences for public health."