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This year's Nobel Prize in Physiology or Medicine was awarded for revolutionary discoveries that illuminate how the immune system attacks harmful pathogens while protecting the body's own cells.

Three renowned scientists—Japan's Prof. Sakaguchi and US experts Mary Brunkow and Fred Ramsdell—share this accolade.

Their work uncovered unique "sentinels" within the immune system that eliminate rogue defense cells capable of harming the organism.

These discoveries are now enabling new treatments for immune disorders and malignancies.

The laureates will divide a monetary award valued at 11 million Swedish kronor.

Crucial Findings

"Their research has been decisive for comprehending how the immune system operates and the reason we don't all suffer from serious autoimmune diseases," stated the chair of the Nobel Committee.

This team's studies explain a fundamental question: In what way does the defense system protect us from countless infections while keeping our own tissues unharmed?

The immune system employs white blood cells that scan for indicators of disease, including pathogens and germs it has never encountered.

These defenders utilize detectors—known as receptors—that are produced randomly in countless combinations.

That gives the immune system the ability to fight a broad range of threats, but the randomness of the process unavoidably produces immune cells that may attack the body.

Protectors of the Body

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

This year's award honors the identification of regulatory T-cells—known as the immune system's "security guards"—which travel through the body to neutralize any defenders that assault the healthy cells.

It is known that this process fails in self-attack conditions such as juvenile diabetes, MS, and rheumatoid arthritis.

The Nobel panel added, "The findings have established a novel area of research and accelerated the creation of new treatments, for instance for cancer and immune disorders."

In malignancies, T-regs block the system from attacking the tumor, so studies are aimed at lowering their quantity.

For autoimmune diseases, experiments are exploring increasing T-reg cells so the organism is not under attack. A comparable method could also be useful in reducing the chances of organ transplant rejection.

Innovative Studies

Professor Shimon Sakaguchi, of a Japanese institution, performed tests on mice that had their thymus extracted, leading to autoimmune disease.

He demonstrated that injecting defense cells from healthy mice could prevent the disease—implying there was a system for blocking immune cells from attacking the body.

Dr. Brunkow, affiliated with the Institute for Systems Biology in Seattle, and Dr. Ramsdell, now at a biotech firm in a California city, were investigating an inherited immune disorder in rodents and humans that led to the discovery of a gene vital for how T-regs operate.

"Their pioneering research has revealed how the immune system is controlled by regulatory T cells, preventing it from mistakenly attacking the body's own tissues," commented a prominent physiology expert.

"The research is a remarkable example of how fundamental physiological research can have far-reaching consequences for human health."