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This year's Nobel Prize in Physiology or Medicine has been granted for revolutionary discoveries that clarify how the immune system targets harmful infections while protecting the healthy tissues.

A trio of renowned researchers—from Japan Prof. Sakaguchi and American scientists Dr. Brunkow and Dr. Ramsdell—received this honor.

Their work uncovered specialized "security guards" within the immune system that eliminate rogue immune cells capable of harming the organism.

The findings are now paving the way for new therapies for autoimmune diseases and cancer.

The laureates will share a prize fund worth 11m SEK.

Crucial Discoveries

"Their research has been essential for comprehending how the immune system functions and the reason we do not all develop severe self-attack conditions," commented the chair of the Nobel Committee.

The trio's research explain a core mystery: How does the immune system defend us from countless infections while keeping our healthy cells unharmed?

The body's protection system uses white blood cells that scan for signs of infection, even viruses and germs it has never encountered.

These cells utilize sensors—known as recognition units—that are generated randomly in a vast number of combinations.

This gives the immune system the capacity to fight a wide array of invaders, but the randomness of the mechanism unavoidably produces immune cells that can attack the body.

Security Guards of the Body

Scientists earlier knew that some of these problematic white blood cells were eliminated in the immune organ—where white blood cells mature.

This year's award recognizes the identification of regulatory T-cells—described as the immune system's "security guards"—which travel through the body to neutralize other defenders that attack the healthy cells.

We know that this process fails in autoimmune diseases such as type-1 diabetes, multiple sclerosis, and RA.

The Nobel panel stated, "The findings have established a novel area of research and accelerated the development of new therapies, for example for cancer and immune disorders."

In malignancies, T-regs block the body from fighting the growth, so studies are focused on lowering their quantity.

For autoimmune diseases, experiments are testing increasing T-reg cells so the organism is not under attack. A comparable approach could also be effective in minimizing the risks of organ transplant rejection.

Innovative Experiments

Prof Sakaguchi, from Osaka University, performed experiments on rodents that had their thymus extracted, causing self-attack conditions.

The researcher showed that injecting defense cells from healthy mice could prevent the illness—suggesting there was a mechanism for preventing immune cells from attacking the body.

Mary Brunkow, affiliated with the a research center in Seattle, and Dr. Ramsdell, now at a biotech firm in San Francisco, were investigating an inherited immune disorder in rodents and people that resulted in the discovery of a gene vital for how regulatory T-cells function.

"Their groundbreaking research has revealed how the immune system is kept in check by regulatory T cells, stopping it from mistakenly targeting the healthy cells," said a leading physiology specialist.

"The work is a remarkable illustration of how basic biological research can have broad consequences for public health."