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This year's prestigious award in Physiology or Medicine was granted for transformative discoveries that clarify how the immune system targets harmful pathogens while sparing the healthy tissues.

Three renowned researchers—from Japan Shimon Sakaguchi and American scientists Mary Brunkow and Fred Ramsdell—share this accolade.

The work identified unique "security guards" within the defense system that remove malfunctioning immune cells capable of harming the body.

The discoveries are now enabling innovative therapies for autoimmune diseases and malignancies.

These winners will divide a prize fund valued at 11 million Swedish kronor.

Crucial Findings

"The work has been decisive for understanding how the body's defenses operates and why we do not all suffer from severe autoimmune diseases," commented the head of the Nobel Committee.

This team's research address a fundamental mystery: How does the defense system protect us from countless invaders while keeping our healthy cells intact?

The immune system employs white blood cells that search for indicators of infection, including pathogens and bacteria it has never encountered.

Such defenders utilize detectors—known as recognition units—that are produced randomly in countless combinations.

This provides the defense network the ability to combat a broad range of threats, but the unpredictability of the mechanism inevitably produces white blood cells that can target the host.

Security Guards of the Immune System

Scientists previously understood that some of these harmful defense cells were eliminated in the thymus—where immune cells mature.

The latest award honors the identification of T-reg cells—described as the body's "security guards"—which travel through the body to neutralize other defenders that attack the body's own tissues.

We know that this process malfunctions in autoimmune diseases such as juvenile diabetes, multiple sclerosis, and rheumatoid arthritis.

A prize committee added, "The discoveries have established a novel area of investigation and spurred the creation of new treatments, for instance for tumors and immune disorders."

Regarding malignancies, T-regs block the body from attacking the tumor, so studies are focused on reducing their quantity.

For autoimmune diseases, experiments are exploring increasing regulatory T-cells so the organism is no longer under attack. A comparable approach could also be effective in minimizing the chances of transplanted organ rejection.

Pioneering Experiments

Professor Sakaguchi, from a Japanese institution, conducted experiments on mice that had their thymus removed, causing autoimmune disease.

The researcher demonstrated that introducing immune cells from other animals could prevent the disease—implying there was a system for preventing immune cells 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 genetic immune disorder in rodents and humans that led to the discovery of a gene vital for the way T-regs function.

"Their groundbreaking research has uncovered how the immune system is controlled by regulatory T cells, preventing it from mistakenly targeting the healthy cells," commented a prominent physiology expert.

"This work is a remarkable illustration of how basic physiological study can have far-reaching implications for human health."