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This year's Nobel Prize in medical science was awarded for transformative discoveries that clarify how the immune system attacks dangerous infections while protecting the body's own cells.

A trio of esteemed researchers—from Japan Prof. Sakaguchi and American experts Mary Brunkow and Fred Ramsdell—share this accolade.

The work uncovered specialized "sentinels" within the immune system that remove malfunctioning immune cells that could attacking the body.

These findings are now enabling new treatments for autoimmune diseases and cancer.

These winners will divide a prize fund worth 11 million SEK.

Crucial Discoveries

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

The team's research address a core question: In what way does the immune system protect us from countless invaders while keeping our own tissues unharmed?

Our body's protection system uses white blood cells that search for indicators of disease, even viruses and germs it has never encountered.

Such defenders employ detectors—called receptors—that are generated randomly in countless combinations.

This gives the immune system the capacity to combat a broad range of threats, but the randomness of the mechanism unavoidably creates white blood cells that may attack the body.

Protectors of the Body

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

The latest Nobel Prize honors the discovery of regulatory T-cells—described as the immune system's "peacekeepers"—which patrol the body to disarm any defenders that attack the healthy cells.

We know that this mechanism malfunctions in self-attack conditions such as type-1 diabetes, multiple sclerosis, and RA.

A prize committee added, "The discoveries have established a novel area of investigation and spurred the development of new therapies, for example for cancer and autoimmune diseases."

Regarding malignancies, regulatory T-cells prevent the body from attacking the tumor, so research are focused on lowering their quantity.

For self-attack disorders, experiments are exploring boosting T-reg cells so the organism is no longer under attack. A comparable method could also be effective in reducing the risks of organ transplant rejection.

Innovative Experiments

Professor Sakaguchi, of Osaka University, performed experiments on rodents that had their thymus removed, leading to self-attack conditions.

He showed that introducing immune cells from other animals could prevent the illness—suggesting there was a system for blocking defenders from harming the body.

Mary Brunkow, from the a research center in a US city, and Dr. Ramsdell, currently at a biotech firm in a California city, were investigating an genetic autoimmune disease in mice and people that resulted in the identification of a gene vital for the way T-regs operate.

"The pioneering work has revealed how the immune system is kept in check by T-reg cells, preventing it from mistakenly targeting the body's own tissues," commented a prominent physiology expert.

"This research is a striking illustration of how basic biological research can have broad implications for human health."