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This year's Nobel Prize in Physiology or Medicine has been awarded for transformative findings that clarify how the body's defense network attacks harmful pathogens while protecting the healthy tissues.

Three esteemed researchers—Japan's Shimon Sakaguchi and American scientists Mary Brunkow and Fred Ramsdell—received this accolade.

Their research identified unique "sentinels" within the immune system that remove malfunctioning immune cells capable of harming the organism.

The findings are now paving the way for new treatments for autoimmune diseases and malignancies.

The laureates will divide a monetary award worth 11 million Swedish kronor.

Decisive Discoveries

"Their work has been essential for understanding how the body's defenses operates and the reason we don't all develop severe autoimmune diseases," commented the chair of the Nobel Committee.

The team's research explain a core question: How does the defense system defend us from countless invaders while keeping our own tissues intact?

The body's protection system uses white blood cells that scan for indicators of infection, including viruses and bacteria it has not met before.

Such cells employ sensors—called recognition units—that are produced randomly in a vast number of combinations.

This provides the immune system the capacity to combat a broad range of invaders, but the unpredictability of the process inevitably creates immune cells that may target the host.

Security Guards of the Body

Researchers previously understood that some of these harmful defense cells were eliminated in the thymus—the site where immune cells develop.

The latest award honors the identification of T-reg cells—described as the body's "security guards"—which travel through the system to neutralize any immune cells that assault the healthy cells.

It is known that this mechanism malfunctions in autoimmune diseases such as type-1 diabetes, multiple sclerosis, and rheumatoid arthritis.

The Nobel panel added, "The findings have established a novel area of research and accelerated the development of innovative therapies, for instance for tumors and autoimmune diseases."

In cancer, regulatory T-cells block the body from fighting the growth, so research are aimed at lowering their quantity.

For self-attack disorders, trials are exploring boosting T-reg 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

Prof Shimon Sakaguchi, from Osaka University, performed tests on mice that had their thymus removed, causing self-attack conditions.

The researcher demonstrated that injecting defense cells from other mice could prevent the disease—implying there was a mechanism for blocking defenders from harming the body.

Mary Brunkow, affiliated with the a research center in Seattle, and Fred Ramsdell, currently at a biotech firm in a California city, were studying an genetic immune disorder in mice and humans that resulted in the discovery of a gene vital for the way regulatory T-cells operate.

"Their pioneering research has uncovered how the immune system is kept in check by regulatory T cells, stopping it from mistakenly targeting the healthy cells," commented a prominent physiology expert.

"This research is a remarkable illustration of how fundamental biological research can have broad consequences for human health."