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The Nobel Prize in Physiology or Medicine has been awarded for transformative discoveries that clarify how the body's defense network attacks dangerous infections while sparing the body's own cells.

Three esteemed researchers—from Japan Shimon Sakaguchi and US experts Dr. Brunkow and Dr. Ramsdell—share this honor.

Their work uncovered specialized "security guards" within the defense system that remove malfunctioning immune cells capable of attacking the organism.

These discoveries are now paving the way for new therapies for immune disorders and malignancies.

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

Decisive Findings

"The research has been decisive for comprehending how the body's defenses operates and the reason we don't all suffer from severe autoimmune diseases," stated the chair of the Nobel Committee.

The team's research address a fundamental mystery: In what way does the immune system protect us from numerous invaders while leaving our own tissues intact?

The body's protection system uses white blood cells that scan for signs of infection, including pathogens and germs it has never encountered.

Such cells utilize sensors—called recognition units—that are produced randomly in countless variations.

That gives the immune system the ability to combat a broad range of invaders, but the randomness of the process unavoidably produces white blood cells that may attack the body.

Security Guards of the Immune System

Researchers earlier understood that a portion of these problematic white blood cells were destroyed in the immune organ—where white blood cells mature.

This year's award recognizes the discovery of regulatory T-cells—described as the immune system's "peacekeepers"—which travel through the body to neutralize other defenders that attack the healthy cells.

It is known that this mechanism fails in autoimmune diseases such as juvenile diabetes, multiple sclerosis, and RA.

A prize committee stated, "These discoveries have laid the foundation for a novel area of research and accelerated the development of new treatments, for example for tumors and autoimmune diseases."

Regarding cancer, T-regs block the body from fighting the growth, so studies are aimed at reducing their quantity.

In self-attack disorders, trials are testing boosting T-reg cells so the body is no longer being harmed. A comparable method could also be effective in minimizing the chances of transplanted organ rejection.

Pioneering Experiments

Prof Sakaguchi, of a Japanese institution, conducted experiments on mice that had their thymus extracted, leading to self-attack conditions.

The researcher demonstrated that injecting immune cells from other mice could prevent the disease—implying there was a system for preventing immune cells from harming the host.

Mary Brunkow, from the Institute for Systems Biology in a US city, and Fred Ramsdell, now at a biotech firm in San Francisco, were studying an inherited autoimmune disease in mice and people that led to the discovery of a genetic factor vital for the way T-regs function.

"The pioneering work has revealed how the body's defenses is kept in check by regulatory T cells, preventing it from accidentally targeting the body's own tissues," said a leading biological science specialist.

"This work is a striking illustration of how fundamental physiological research can have far-reaching implications for public health."