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The Nobel Prize in Physiology or Medicine was awarded for transformative discoveries that illuminate how the immune system targets harmful pathogens while sparing the healthy tissues.

Three renowned researchers—Japan's Shimon Sakaguchi and American scientists Mary Brunkow and Dr. Ramsdell—share this honor.

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

These discoveries are now enabling innovative treatments for autoimmune diseases and cancer.

The winners will share a monetary award valued at 11 million Swedish kronor.

Decisive Findings

"The research has been decisive for understanding how the body's defenses functions and why we do not all suffer from severe autoimmune diseases," commented the head of the award panel.

The trio's studies address a core question: How does the defense system protect us from numerous invaders while keeping our own tissues unharmed?

The body's protection system employs white blood cells that scan for indicators of disease, including viruses and bacteria it has not met before.

Such defenders utilize sensors—known as receptors—that are produced by chance in countless variations.

This provides the defense network the capacity to combat a wide array of invaders, but the randomness of the mechanism unavoidably produces white blood cells that can attack the body.

Protectors of the Immune System

Scientists earlier knew that a portion of these harmful defense cells were eliminated in the thymus—the site where immune cells mature.

The latest award recognizes the discovery of regulatory T-cells—known as the immune system's "security guards"—which travel through the system to neutralize other immune cells that assault the body's own tissues.

It is known that this mechanism malfunctions in self-attack conditions such as type-1 diabetes, multiple sclerosis, and rheumatoid arthritis.

The Nobel panel added, "These findings have established a novel area of research and spurred the development of new therapies, for example for tumors and immune disorders."

In cancer, T-regs prevent the system from attacking the tumor, so research are focused on reducing their quantity.

For autoimmune diseases, trials are testing boosting regulatory T-cells so the body is not being harmed. A comparable method could also be effective in reducing the risks of organ transplant rejection.

Innovative Experiments

Prof Shimon Sakaguchi, from Osaka University, performed tests on rodents that had their thymus extracted, leading to self-attack conditions.

He demonstrated that introducing defense cells from other mice could prevent the disease—implying there was a system for preventing defenders from attacking the host.

Mary Brunkow, from the a research center in a US city, and Fred Ramsdell, currently at a biotech firm in San Francisco, were studying an inherited autoimmune disease in rodents and humans that led to the identification of a gene critical for how T-regs function.

"The pioneering work has revealed how the immune system is kept in check by regulatory T cells, stopping it from accidentally targeting the body's own tissues," commented a leading biological science expert.

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