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This year's prestigious award in Physiology or Medicine was granted for revolutionary findings that illuminate how the immune system attacks harmful infections while sparing the healthy tissues.

A trio of renowned scientists—Japan's Shimon Sakaguchi and American experts Mary Brunkow and Fred Ramsdell—received this honor.

Their research identified specialized "security guards" within the immune system that remove rogue defense cells capable of attacking the body.

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

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

Crucial Findings

"The work has been decisive for comprehending how the immune system functions and the reason we do not all develop severe self-attack conditions," commented the head of the award panel.

This trio's studies explain a fundamental mystery: How does the immune system defend us from numerous invaders while keeping our own tissues intact?

The body's protection system uses white blood cells that search for indicators of infection, even viruses and germs it has never encountered.

Such defenders utilize detectors—known as receptors—that are produced by chance in countless combinations.

This gives the defense network the ability to combat a wide array of threats, but the unpredictability of the process unavoidably creates immune cells that may target the body.

Protectors of the Immune System

Scientists previously knew that a portion of these problematic defense cells were eliminated in the immune organ—where white blood cells develop.

This year's award honors the discovery of regulatory T-cells—described as the body's "security guards"—which patrol the system to neutralize any immune cells that assault the healthy cells.

It is known that this mechanism malfunctions in self-attack conditions such as juvenile diabetes, multiple sclerosis, and rheumatoid arthritis.

A prize committee added, "The discoveries have established a new field of investigation and accelerated the development of new treatments, for example for tumors and autoimmune diseases."

Regarding malignancies, T-regs prevent the system from attacking the growth, so studies are aimed at lowering their quantity.

For autoimmune diseases, trials are testing boosting regulatory T-cells so the organism is not being harmed. A comparable method could also be effective in reducing the chances of organ transplant rejection.

Pioneering Experiments

Professor Sakaguchi, from Osaka University, performed experiments on mice that had their immune gland removed, causing autoimmune disease.

The researcher demonstrated that injecting immune cells from healthy mice could stop the disease—implying there was a mechanism for preventing immune cells from attacking the host.

Mary Brunkow, from the Institute for Systems Biology in a US city, and Dr. Ramsdell, currently at a biotech firm in San Francisco, were investigating an inherited autoimmune disease in rodents and humans that led to the discovery of a genetic factor vital for the way T-regs operate.

"The groundbreaking research has revealed how the body's defenses is kept in check by T-reg cells, stopping it from mistakenly attacking the body's own tissues," commented a leading physiology specialist.

"The work is a striking example of how basic biological research can have far-reaching consequences for human health."