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This year's Nobel Prize in medical science has been granted for transformative discoveries that clarify how the immune system targets dangerous pathogens while sparing the healthy tissues.

Three renowned researchers—from Japan Shimon Sakaguchi and American experts Dr. Brunkow and Dr. Ramsdell—received this honor.

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

The discoveries are now paving the way for innovative treatments for immune disorders and cancer.

The winners will share a prize fund worth 11 million Swedish kronor.

Crucial Discoveries

"The work has been essential for understanding how the immune system functions and the reason we don't all suffer from severe self-attack conditions," stated the head of the Nobel Committee.

This trio's research address a core question: How does the defense system protect us from countless infections while leaving our healthy cells intact?

Our immune system uses white blood cells that search for signs of disease, including viruses and bacteria it has not met before.

Such cells employ detectors—known as recognition units—that are generated by chance in countless combinations.

This gives the defense network the capacity to fight a broad range of invaders, but the unpredictability of the process unavoidably creates immune cells that can target the host.

Security Guards of the Immune System

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

The latest award recognizes the identification of regulatory T-cells—described as the immune system's "security guards"—which patrol the body to disarm other immune cells that attack the body's own tissues.

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

A Nobel panel stated, "The discoveries have laid the foundation for a novel area of research and accelerated the development of new therapies, for example for tumors and autoimmune diseases."

Regarding cancer, regulatory T-cells prevent the body from fighting the growth, so research are aimed at lowering their numbers.

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

Innovative Studies

Professor Shimon Sakaguchi, from a Japanese institution, performed experiments on rodents that had their immune gland removed, causing autoimmune disease.

He showed that injecting immune cells from healthy mice could stop the disease—implying there was a mechanism for preventing defenders from attacking the host.

Mary Brunkow, affiliated with the Institute for Systems Biology in Seattle, and Dr. Ramsdell, currently at Sonoma Biotherapeutics in San Francisco, were investigating an inherited autoimmune disease in rodents and people that resulted in the identification of a gene vital for how T-regs operate.

"The groundbreaking work has revealed how the body's defenses is controlled by T-reg cells, stopping it from accidentally attacking the healthy cells," said a leading biological science expert.

"The research is a remarkable example of how basic physiological study can have broad consequences for public health."