Prestigious Prize Honors Pioneering Immune System Discoveries

This year's prestigious award in Physiology or Medicine has been granted for transformative discoveries that clarify how the body's defense network attacks dangerous infections while sparing the healthy tissues.

Three renowned researchers—Japan's Shimon Sakaguchi and US experts Mary Brunkow and Dr. Ramsdell—share this accolade.

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

The findings are now enabling new therapies for immune disorders and cancer.

The laureates will divide a prize fund worth 11m Swedish kronor.

Crucial Discoveries

"Their work has been decisive for comprehending how the body's defenses operates and the reason we don't all suffer from severe autoimmune diseases," commented the chair of the award panel.

The trio's research address a core question: In what way does the immune system protect us from numerous infections while keeping our healthy cells unharmed?

The immune system uses immune cells that scan for signs of infection, even viruses and germs it has not met before.

These defenders utilize detectors—called receptors—that are generated randomly in countless combinations.

This gives the defense network the ability to fight a broad range of threats, but the unpredictability of the mechanism inevitably creates immune cells that can attack the host.

Protectors of the Body

Researchers previously understood that a portion of these problematic defense cells were destroyed in the immune organ—the site where white blood cells mature.

The latest Nobel Prize recognizes the discovery of regulatory T-cells—described as the immune system's "peacekeepers"—which travel through the system to disarm other immune cells that assault the healthy cells.

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

A prize committee stated, "The discoveries have established a novel area of investigation and accelerated the creation of innovative treatments, for example for tumors and immune disorders."

In cancer, T-regs block the system from attacking the tumor, so studies are focused on lowering their quantity.

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

Pioneering Experiments

Prof Sakaguchi, from Osaka University, conducted experiments on mice that had their thymus extracted, causing self-attack conditions.

He showed that introducing immune cells from other mice could prevent the illness—suggesting there was a system for preventing defenders from attacking the body.

Dr. Brunkow, affiliated with the Institute for Systems Biology in Seattle, and Dr. Ramsdell, currently at a biotech firm in San Francisco, were studying an genetic immune disorder in rodents and people that led to the discovery of a genetic factor critical for how regulatory T-cells function.

"Their pioneering research has revealed how the immune system is controlled by T-reg cells, preventing it from accidentally targeting the healthy cells," commented a prominent physiology specialist.

"This work is a remarkable example of how basic biological study can have broad implications for human health."