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The Nobel Prize in Physiology or Medicine was awarded for revolutionary discoveries that clarify how the immune system attacks harmful infections while protecting the body's own cells.

Three esteemed researchers—Japan's Prof. Sakaguchi and US scientists Mary Brunkow and Dr. Ramsdell—received this honor.

Their work identified specialized "security guards" within the defense system that eliminate rogue immune cells that could harming the organism.

These discoveries are now paving the way for new therapies for autoimmune diseases and cancer.

These winners will divide a prize fund valued at 11 million Swedish kronor.

Crucial Discoveries

"The work has been decisive for comprehending how the body's defenses operates and why we do not all suffer from severe autoimmune diseases," stated the head of the award panel.

This team's research address a core question: How does the defense system protect us from numerous invaders while leaving our healthy cells unharmed?

Our immune system employs white blood cells that scan for signs of disease, including viruses and germs it has not met before.

Such defenders utilize detectors—known as recognition units—that are generated randomly in countless combinations.

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

Security Guards of the Immune System

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

The latest award honors the discovery of regulatory T-cells—described as the body's "security guards"—which travel through the body to disarm other immune cells that attack the body's own tissues.

We know that this mechanism malfunctions in autoimmune diseases such as juvenile diabetes, MS, and rheumatoid arthritis.

A prize committee stated, "The findings have established a novel area of investigation and spurred the development of innovative therapies, for instance for tumors and immune disorders."

In cancer, regulatory T-cells block the system from fighting the tumor, so studies are aimed at reducing their quantity.

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

Pioneering Experiments

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

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

Dr. Brunkow, affiliated with the Institute for Systems Biology in a US city, and Fred Ramsdell, currently at a biotech firm in San Francisco, were investigating an inherited autoimmune disease in mice and humans that resulted in the discovery of a genetic factor vital for the way regulatory T-cells operate.

"Their pioneering research has revealed how the body's defenses is controlled by T-reg cells, preventing it from mistakenly targeting the healthy cells," commented a prominent physiology expert.

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