Prestigious Prize Recognizes Groundbreaking Body's Defenses Discoveries

The prestigious award in Physiology or Medicine has been granted for transformative findings that illuminate how the immune system attacks harmful pathogens while protecting the body's own cells.

Three esteemed researchers—Japan's Shimon Sakaguchi and US scientists Dr. Brunkow and Fred Ramsdell—share this accolade.

The work identified specialized "sentinels" within the immune system that eliminate rogue defense cells capable of harming the body.

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

These winners will share a monetary award worth 11 million SEK.

Decisive Findings

"Their work has been decisive for understanding how the body's defenses functions and why we don't all develop severe autoimmune diseases," commented the head of the award panel.

This trio's research explain a fundamental mystery: How does the defense system protect us from countless infections while leaving our own tissues intact?

Our body's protection system uses white blood cells that scan for indicators of infection, including pathogens and bacteria it has never encountered.

Such defenders employ detectors—called recognition units—that are generated randomly in a vast number of variations.

This gives the immune system the ability to combat a wide array of invaders, but the unpredictability of the process inevitably produces white blood cells that may attack the body.

Protectors of the Immune System

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

The latest Nobel Prize recognizes the discovery of regulatory T-cells—described as the immune system's "security guards"—which travel through the system to neutralize any defenders that assault the body's own tissues.

We know that this mechanism fails in self-attack conditions such as juvenile diabetes, MS, and rheumatoid arthritis.

The prize committee stated, "The discoveries have established a new field of investigation and spurred the development of new treatments, for instance for cancer and immune disorders."

In cancer, T-regs block the system from fighting the tumor, so studies are aimed at reducing their numbers.

For self-attack disorders, trials are testing boosting T-reg cells so the organism is no longer being harmed. A similar approach could also be useful in minimizing the chances of organ transplant failure.

Pioneering Experiments

Prof Shimon Sakaguchi, of a Japanese institution, conducted experiments on mice that had their immune gland removed, causing autoimmune disease.

He showed that injecting immune cells from healthy animals could stop the illness—suggesting there was a mechanism for preventing defenders from attacking the body.

Mary Brunkow, from the a research center in a US city, and Fred Ramsdell, now at Sonoma Biotherapeutics in San Francisco, were investigating an inherited immune disorder in mice and people that resulted in the discovery of a genetic factor vital for how regulatory T-cells function.

"Their groundbreaking research has revealed how the immune system is kept in check by regulatory T cells, stopping it from mistakenly targeting the healthy cells," said a leading physiology expert.

"The research is a remarkable illustration of how fundamental physiological study can have broad consequences for human health."