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This year's Nobel Prize in medical science has been awarded for transformative discoveries that clarify how the immune system attacks dangerous pathogens while protecting the body's own cells.

A trio of esteemed scientists—from Japan Shimon Sakaguchi and US scientists Mary Brunkow and Dr. Ramsdell—received this accolade.

Their work uncovered specialized "security guards" within the defense system that eliminate rogue defense cells capable of attacking the body.

These discoveries are now enabling innovative therapies for immune disorders and cancer.

These laureates will divide a monetary award valued at 11 million SEK.

Decisive Findings

"The work has been essential for comprehending how the body's defenses operates and why we do not all suffer from severe self-attack conditions," stated the chair of the Nobel Committee.

This team's research address a core mystery: How does the immune system defend us from countless infections while leaving our own tissues intact?

The immune system uses white blood cells that search for signs of disease, including viruses and bacteria it has never encountered.

Such defenders employ detectors—called receptors—that are generated randomly in countless variations.

That gives the defense network the ability to combat a wide array of invaders, but the unpredictability of the mechanism inevitably creates white blood cells that can target the body.

Security Guards of the Immune System

Scientists previously understood that a portion of these harmful defense cells were destroyed in the thymus—the site where immune cells mature.

This year's Nobel Prize recognizes the identification of regulatory T-cells—known as the body's "security guards"—which patrol the system to disarm any immune cells that assault the body's own tissues.

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

The Nobel panel stated, "These discoveries have laid the foundation for a new field of research and accelerated the creation of innovative therapies, for example for tumors and immune disorders."

Regarding cancer, regulatory T-cells block the system from attacking the tumor, so studies are focused on lowering their numbers.

In autoimmune diseases, experiments are testing increasing regulatory T-cells so the organism is not being harmed. A similar approach could also be effective in minimizing the chances of organ transplant rejection.

Pioneering Experiments

Professor Sakaguchi, of Osaka University, conducted tests on mice that had their thymus extracted, causing autoimmune disease.

He demonstrated that injecting immune cells from other animals could stop the disease—implying there was a system for preventing immune cells from harming the host.

Mary Brunkow, from the Institute for Systems Biology in Seattle, and Dr. Ramsdell, now at a biotech firm in San Francisco, were studying an genetic autoimmune disease in rodents and people that led to the identification of a gene vital for the way regulatory T-cells function.

"Their pioneering work has revealed how the body's defenses is kept in check by T-reg cells, preventing it from mistakenly targeting the healthy cells," commented a prominent physiology expert.

"This research is a remarkable example of how basic physiological research can have broad implications for public health."