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The Nobel Prize in medical science was granted for revolutionary discoveries that illuminate how the immune system targets harmful infections while protecting the healthy tissues.

Three renowned scientists—from Japan Shimon Sakaguchi and US scientists Mary Brunkow and Fred Ramsdell—share this honor.

The research uncovered specialized "security guards" within the immune system that eliminate malfunctioning defense cells capable of harming the body.

These discoveries are now paving the way for new treatments for autoimmune diseases and malignancies.

These laureates will share a monetary award worth 11 million Swedish kronor.

Crucial Discoveries

"The work has been essential for understanding how the immune system functions and the reason we don't all suffer from severe autoimmune diseases," commented the chair of the Nobel Committee.

This trio's studies explain a core mystery: In what way does the defense system defend us from countless invaders while leaving our healthy cells intact?

Our body's protection system employs immune cells that search for signs of disease, including viruses and germs it has not met before.

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

This provides the immune system the ability to fight a broad range of threats, but the unpredictability of the process unavoidably creates white blood cells that may attack the host.

Security Guards of the Immune System

Researchers earlier understood that a portion of these harmful white blood cells were eliminated in the thymus—where immune cells develop.

This year's award recognizes the discovery of T-reg cells—described as the body's "security guards"—which travel through the system to neutralize any immune cells that attack the body's own tissues.

It is known that this process fails in self-attack conditions such as juvenile diabetes, MS, and rheumatoid arthritis.

The prize committee stated, "The findings have established a new field of investigation and spurred the creation of new therapies, for instance for tumors and autoimmune diseases."

In cancer, regulatory T-cells prevent the body from fighting the growth, so studies are aimed at reducing their quantity.

For self-attack disorders, experiments 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 transplanted organ rejection.

Pioneering Experiments

Prof Sakaguchi, from Osaka University, conducted experiments on rodents that had their thymus extracted, causing autoimmune disease.

The researcher showed that introducing immune cells from other mice could stop the illness—suggesting there was a system for blocking defenders from harming the body.

Mary Brunkow, from the a research center in Seattle, and Fred Ramsdell, currently at Sonoma Biotherapeutics in a California city, were investigating an inherited autoimmune disease in mice and humans that led to the identification of a genetic factor vital for how T-regs function.

"The groundbreaking research has uncovered how the immune system is controlled by regulatory T cells, preventing it from mistakenly targeting the body's own tissues," said a leading biological science specialist.

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