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The Nobel Prize in Physiology or Medicine was granted for transformative discoveries that clarify how the immune system targets dangerous infections while protecting the healthy tissues.

A trio of renowned researchers—from Japan Shimon Sakaguchi and US scientists Dr. Brunkow and Dr. Ramsdell—share this accolade.

The work uncovered unique "sentinels" within the immune system that remove malfunctioning immune cells that could attacking the body.

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

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

Decisive Findings

"The work has been essential for comprehending how the immune system functions and the reason we don't all suffer from serious self-attack conditions," stated the head of the Nobel Committee.

The trio's studies explain a fundamental question: In what way does the immune system defend us from numerous invaders while keeping our healthy cells unharmed?

Our body's protection system employs white blood cells that search for indicators of infection, including pathogens and germs it has never encountered.

Such cells employ sensors—known as receptors—that are produced randomly in a vast number of variations.

This provides the defense network the ability to combat a broad range of invaders, but the unpredictability of the process inevitably produces white blood cells that may attack the host.

Security Guards of the Body

Researchers earlier understood that some of these harmful defense cells were destroyed in the immune organ—where white blood cells mature.

The latest award recognizes the discovery of regulatory T-cells—described as the immune system's "security guards"—which patrol the body to disarm any defenders that attack the healthy cells.

It is known that this process fails in autoimmune diseases such as juvenile diabetes, MS, and RA.

The Nobel panel added, "These discoveries have established a new field of investigation and spurred the development of innovative therapies, for instance for tumors and autoimmune diseases."

In cancer, T-regs prevent the system from fighting the tumor, so studies are aimed at reducing their numbers.

For self-attack disorders, trials are testing increasing T-reg cells so the body is no longer being harmed. A similar method could also be effective in minimizing the risks of organ transplant rejection.

Pioneering Experiments

Prof Sakaguchi, of Osaka University, performed experiments on rodents that had their thymus extracted, causing self-attack conditions.

The researcher demonstrated that introducing immune cells from healthy animals could prevent the disease—implying there was a system for blocking defenders from harming the body.

Dr. Brunkow, from the Institute for Systems Biology in Seattle, and Fred Ramsdell, now at Sonoma Biotherapeutics in San Francisco, were studying an genetic autoimmune disease in mice and humans that resulted in the discovery of a genetic factor critical for how T-regs operate.

"Their pioneering research has uncovered how the body's defenses is controlled by T-reg cells, preventing it from mistakenly attacking the healthy cells," commented a prominent biological science specialist.

"The research is a remarkable example of how fundamental physiological study can have broad implications for public health."