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This year's Nobel Prize in Physiology or Medicine has been awarded for revolutionary findings that clarify how the body's defense network targets dangerous infections while protecting the body's own cells.

A trio of esteemed researchers—from Japan Prof. Sakaguchi and American scientists Mary Brunkow and Dr. Ramsdell—share this honor.

Their research identified unique "security guards" within the defense system that eliminate malfunctioning immune cells capable of attacking the body.

These discoveries are now enabling new treatments for autoimmune diseases and malignancies.

These winners will share a prize fund valued at 11 million SEK.

Decisive Findings

"The work has been decisive for comprehending how the body's defenses operates and why we don't all develop serious self-attack conditions," commented the head of the Nobel Committee.

The trio's research address a fundamental mystery: In what way does the immune system defend us from numerous invaders while leaving our healthy cells unharmed?

The body's protection system uses immune cells that search for indicators of disease, including viruses and bacteria it has never encountered.

Such cells employ sensors—known as recognition units—that are generated randomly in countless variations.

This provides the immune system the capacity to fight a wide array of invaders, but the unpredictability of the mechanism unavoidably produces immune cells that can target the body.

Security Guards of the Immune System

Researchers earlier understood that a portion of these problematic defense cells were eliminated in the thymus—the site where immune cells develop.

This year's Nobel Prize recognizes the identification of T-reg cells—described as the immune system's "peacekeepers"—which patrol the system to neutralize any immune cells that assault the body's own tissues.

We know that this mechanism fails in autoimmune diseases such as juvenile diabetes, multiple sclerosis, and RA.

A Nobel panel stated, "These findings have laid the foundation for a new field of investigation and spurred the creation of new therapies, for example for cancer and autoimmune diseases."

Regarding malignancies, T-regs block the body from attacking the tumor, so research are aimed at reducing their numbers.

For self-attack disorders, experiments are exploring increasing regulatory T-cells so the organism is no longer under attack. A comparable method could also be effective in reducing the chances of transplanted organ rejection.

Innovative Studies

Professor Sakaguchi, of a Japanese institution, conducted tests on mice that had their immune gland removed, leading to self-attack conditions.

The researcher demonstrated that injecting immune cells from healthy animals could stop the illness—implying there was a mechanism for blocking immune cells from attacking the host.

Dr. Brunkow, affiliated with the a research center in a US city, and Dr. Ramsdell, now at a biotech firm in San Francisco, were studying an genetic immune disorder in rodents and people that led to the identification of a gene critical for how T-regs operate.

"The groundbreaking research has revealed how the immune system is kept in check by regulatory T cells, stopping it from mistakenly targeting the body's own tissues," said a prominent physiology expert.

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