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This year's prestigious award in Physiology or Medicine has been granted for transformative findings that illuminate how the immune system targets dangerous pathogens while protecting the healthy tissues.

A trio of renowned researchers—from Japan Prof. Sakaguchi and American experts Mary Brunkow and Dr. Ramsdell—received this honor.

The research identified unique "sentinels" within the immune system that remove rogue immune cells that could harming the organism.

The findings are now enabling new treatments for immune disorders and malignancies.

These winners will divide a prize fund worth 11 million SEK.

Crucial Discoveries

"The work has been decisive for comprehending how the immune system operates and the reason we don't all suffer from severe autoimmune diseases," commented the head of the Nobel Committee.

The trio's research address a core question: How does the defense system defend us from numerous infections while keeping our own tissues intact?

Our body's protection system employs white blood cells that search for indicators of infection, even viruses and germs it has not met before.

These cells utilize detectors—known as receptors—that are produced randomly in a vast number of variations.

This provides the defense network the ability to combat a wide array of invaders, but the randomness of the process unavoidably creates white blood cells that may attack the host.

Security Guards of the Immune System

Scientists previously understood that some of these harmful white blood cells were eliminated in the thymus—where white blood cells develop.

The latest award honors the identification of T-reg cells—known as the immune system's "peacekeepers"—which patrol the system to neutralize any immune cells that attack the healthy cells.

It is known that this process malfunctions in self-attack conditions such as type-1 diabetes, multiple sclerosis, and RA.

A prize committee added, "The discoveries have established a novel area of research and spurred the development of innovative treatments, for example for tumors and immune disorders."

In malignancies, T-regs prevent the body from fighting the tumor, so studies are focused on lowering their quantity.

For self-attack disorders, trials are exploring increasing regulatory T-cells so the organism is not being harmed. A similar approach could also be effective in reducing the risks of transplanted organ failure.

Pioneering Studies

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

He showed that introducing defense cells from other animals could stop the illness—implying there was a mechanism for preventing immune cells from harming the body.

Mary Brunkow, from the Institute for Systems Biology in Seattle, and Fred Ramsdell, currently at a biotech firm in a California city, were investigating an inherited autoimmune disease in rodents and people that resulted in the discovery of a genetic factor critical for the way regulatory T-cells operate.

"The pioneering research has uncovered how the body's defenses is controlled by regulatory T cells, stopping it from mistakenly attacking the healthy cells," said a prominent physiology expert.

"The research is a striking example of how fundamental biological research can have far-reaching implications for public health."