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The Nobel Prize in medical science has been granted for transformative discoveries that clarify how the body's defense network targets dangerous infections while protecting the healthy tissues.

A trio of renowned researchers—from Japan Shimon Sakaguchi and US scientists Mary Brunkow and Fred Ramsdell—share this honor.

The work identified unique "security guards" within the defense system that remove malfunctioning immune cells capable of harming the organism.

The findings are now paving the way for innovative therapies for autoimmune diseases and malignancies.

The winners will share a monetary award valued at 11 million SEK.

Crucial Findings

"Their research has been essential for comprehending how the body's defenses functions and the reason we do not all suffer from serious self-attack conditions," stated the chair of the Nobel Committee.

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

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

Such defenders employ sensors—known as receptors—that are generated by chance in countless combinations.

That gives the defense network the ability to fight a wide array of threats, but the randomness of the mechanism unavoidably creates white blood cells that can target the body.

Security Guards of the Body

Scientists earlier understood that a portion of these harmful defense cells were eliminated in the thymus—where white blood cells mature.

This year's award recognizes the discovery of T-reg cells—known as the body's "peacekeepers"—which travel through the body to neutralize other defenders that attack the body's own tissues.

We know that this process malfunctions in autoimmune diseases such as type-1 diabetes, MS, and rheumatoid arthritis.

A prize committee stated, "The findings have established a novel area of research and accelerated the development of innovative therapies, for instance for cancer and immune disorders."

Regarding malignancies, T-regs block the body from attacking the growth, so research are aimed at lowering their numbers.

For self-attack disorders, experiments are testing boosting regulatory T-cells so the organism is not being harmed. A comparable approach could also be useful in minimizing the risks of organ transplant failure.

Pioneering Experiments

Professor Shimon Sakaguchi, of a Japanese institution, conducted tests on rodents that had their thymus removed, leading to autoimmune disease.

The researcher demonstrated that introducing immune cells from healthy animals could prevent the illness—implying there was a mechanism for blocking immune cells from attacking the host.

Mary Brunkow, from the Institute for Systems Biology in Seattle, and Fred Ramsdell, now at a biotech firm in a California city, were investigating an genetic autoimmune disease in rodents and people that led to the identification of a gene vital for the way T-regs function.

"The groundbreaking work has uncovered how the body's defenses is kept in check by T-reg cells, stopping it from accidentally attacking the healthy cells," commented a leading biological science specialist.

"The work is a remarkable example of how basic biological research can have far-reaching consequences for public health."