Prestigious Award Honors Groundbreaking Immune System Discoveries

This year's prestigious award in Physiology or Medicine was granted for transformative findings that clarify how the body's defense network targets harmful pathogens while sparing the body's own cells.

A trio of esteemed scientists—Japan's Prof. Sakaguchi and American scientists Mary Brunkow and Dr. Ramsdell—received this honor.

Their research uncovered specialized "security guards" within the immune system that eliminate rogue immune cells capable of harming the body.

The discoveries are now paving the way for new therapies for immune disorders and malignancies.

The laureates will share a monetary award valued at 11 million SEK.

Decisive Findings

"Their work has been decisive for understanding how the body's defenses operates and the reason we do not all develop severe autoimmune diseases," commented the head of the award panel.

This trio's studies address a fundamental mystery: In what way does the defense system defend us from numerous invaders while keeping our own tissues intact?

Our immune system uses immune cells that scan for indicators of disease, even pathogens and bacteria it has not met before.

Such defenders employ detectors—called recognition units—that are generated randomly in countless combinations.

This gives the immune system the ability to fight a broad range of threats, but the unpredictability of the mechanism inevitably creates immune cells that can target the body.

Security Guards of the Immune System

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

The latest award honors the discovery of regulatory T-cells—known as the immune system's "peacekeepers"—which patrol the system to disarm any immune cells that attack the body's own tissues.

We know that this process malfunctions in self-attack conditions such as juvenile diabetes, multiple sclerosis, and rheumatoid arthritis.

The Nobel panel stated, "These findings have established a novel area of investigation and spurred the creation of new therapies, for example for tumors and immune disorders."

Regarding cancer, T-regs prevent the body from attacking the growth, so research are focused on reducing their numbers.

In self-attack disorders, trials are exploring boosting regulatory T-cells so the body is not being harmed. A comparable approach could also be useful in minimizing the risks of transplanted organ failure.

Pioneering Studies

Professor Sakaguchi, of Osaka University, conducted experiments on mice that had their thymus extracted, leading to autoimmune disease.

The researcher showed that introducing immune cells from healthy mice could stop the disease—suggesting there was a mechanism for preventing immune cells from harming the host.

Dr. Brunkow, from the a research center in Seattle, and Dr. Ramsdell, now at Sonoma Biotherapeutics in San Francisco, were studying an genetic autoimmune disease in mice and humans that led to the discovery of a genetic factor critical for the way T-regs function.

"Their pioneering work has revealed how the body's defenses is controlled by regulatory T cells, stopping it from mistakenly targeting the healthy cells," said a leading biological science expert.

"The work is a striking illustration of how fundamental physiological research can have far-reaching implications for human health."