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The prestigious award in medical science was granted for transformative discoveries that illuminate how the body's defense network attacks harmful pathogens while sparing the body's own cells.

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

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

The discoveries are now paving the way for innovative therapies for immune disorders and malignancies.

The winners will divide a prize fund valued at 11m SEK.

Crucial Discoveries

"Their work has been decisive for comprehending how the body's defenses functions and why we don't all suffer from severe self-attack conditions," stated the head of the Nobel Committee.

This team's studies address a core mystery: In what way does the immune system protect us from countless infections while leaving our own tissues unharmed?

The immune system uses white blood cells that scan for signs of disease, including pathogens and germs it has not met before.

Such cells utilize detectors—called receptors—that are generated randomly in countless variations.

That provides the defense network the capacity to combat a wide array of threats, but the unpredictability of the mechanism inevitably produces white blood cells that can target the host.

Security Guards of the Body

Scientists previously knew that some of these harmful white blood cells were destroyed in the immune organ—where immune cells develop.

The latest Nobel Prize recognizes the identification of regulatory T-cells—known as the body's "peacekeepers"—which patrol the body to neutralize any immune cells that attack the healthy cells.

We know that this process fails in autoimmune diseases such as juvenile diabetes, MS, and rheumatoid arthritis.

A prize committee stated, "The discoveries have laid the foundation for a novel area of investigation and accelerated the development of innovative treatments, for example for cancer and autoimmune diseases."

Regarding cancer, T-regs prevent the system from attacking the tumor, so research are focused on lowering their quantity.

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

Innovative Experiments

Prof Sakaguchi, from a Japanese institution, performed tests on rodents that had their immune gland extracted, leading to self-attack conditions.

He showed that injecting immune cells from other animals could prevent the illness—implying there was a mechanism for preventing defenders from attacking the body.

Dr. Brunkow, from the a research center in Seattle, and Dr. Ramsdell, currently at a biotech firm in San Francisco, were studying an inherited immune disorder in rodents and humans that resulted in the identification of a genetic factor critical for the way T-regs function.

"Their groundbreaking research has revealed how the immune system is controlled by T-reg cells, stopping it from mistakenly targeting the healthy cells," said a leading physiology specialist.

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