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This year's prestigious award in Physiology or Medicine has been awarded for transformative findings that illuminate how the immune system targets harmful pathogens while sparing the body's own cells.

Three esteemed scientists—Japan's Prof. Sakaguchi and US scientists Dr. Brunkow and Dr. Ramsdell—share this accolade.

The research uncovered unique "security guards" within the defense system that remove rogue immune cells that could harming the organism.

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

The winners will share a prize fund valued at 11 million SEK.

Crucial Discoveries

"The research has been essential for understanding how the body's defenses functions and the reason we don't all suffer from severe self-attack conditions," commented the chair of the Nobel Committee.

This trio's studies address a core mystery: How does the immune system defend us from numerous invaders while keeping our healthy cells unharmed?

The immune system uses immune cells that search for indicators of disease, even pathogens and bacteria it has never encountered.

These cells utilize sensors—called recognition units—that are generated by chance in countless combinations.

This provides the immune system the capacity to fight a broad range of invaders, but the randomness of the process unavoidably produces immune cells that can target the host.

Security Guards of the Body

Researchers earlier knew that a portion of these harmful white blood cells were eliminated in the thymus—the site where white blood cells mature.

The latest Nobel Prize honors the identification of T-reg cells—described as the body's "peacekeepers"—which travel through the body to disarm any immune cells that attack the body's own tissues.

It is known that this mechanism fails in self-attack conditions such as type-1 diabetes, MS, and rheumatoid arthritis.

A Nobel panel added, "The findings have established a novel area of research and accelerated the creation of new treatments, for example for cancer and immune disorders."

In malignancies, T-regs prevent the body from fighting the tumor, so research are aimed at reducing their numbers.

For autoimmune diseases, experiments are testing boosting T-reg 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

Prof Sakaguchi, of a Japanese institution, conducted tests on mice that had their thymus extracted, causing autoimmune disease.

He demonstrated that introducing immune cells from other mice could prevent the illness—implying there was a mechanism for blocking immune cells from harming the host.

Mary Brunkow, from the Institute for Systems Biology in a US city, and Dr. Ramsdell, now at a biotech firm in San Francisco, were investigating an genetic immune disorder in mice and people that led to the identification of a genetic factor critical for how T-regs function.

"Their groundbreaking work has uncovered how the immune system is kept in check by T-reg cells, preventing it from accidentally attacking the body's own tissues," commented a prominent biological science specialist.

"This work is a remarkable illustration of how fundamental physiological study can have broad implications for public health."