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The prestigious award in Physiology or Medicine has been granted for transformative findings that clarify how the immune system attacks dangerous infections while sparing the body's own cells.

Three renowned scientists—from Japan Prof. Sakaguchi and US scientists Dr. Brunkow and Dr. Ramsdell—received this accolade.

The work uncovered unique "sentinels" within the immune system that eliminate rogue defense cells that could attacking the organism.

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

These laureates will share a monetary award worth 11m Swedish kronor.

Crucial Findings

"The work has been essential for comprehending how the immune system operates and the reason we do not all develop serious autoimmune diseases," commented the head of the Nobel Committee.

The trio's research explain a fundamental mystery: In what way does the immune system defend us from numerous infections while keeping our own tissues intact?

Our immune system uses white blood cells that search for signs of infection, including pathogens and germs it has not met before.

These defenders employ sensors—called receptors—that are generated randomly in countless combinations.

This gives the immune system the capacity to combat a wide array of threats, but the randomness of the process unavoidably creates immune cells that may target the host.

Protectors of the Body

Researchers earlier understood that some of these harmful defense cells were destroyed in the thymus—the site where immune cells mature.

The latest Nobel Prize recognizes the discovery of regulatory T-cells—described as the immune system's "security guards"—which patrol the body to neutralize other immune cells that assault the healthy cells.

It is known that this process malfunctions in autoimmune diseases such as juvenile diabetes, multiple sclerosis, and RA.

The Nobel panel added, "The findings have laid the foundation for a new field of investigation and accelerated the development of new treatments, for example for tumors and autoimmune diseases."

Regarding cancer, T-regs block the system from fighting the growth, so studies are aimed at lowering their quantity.

In self-attack disorders, experiments are testing boosting regulatory T-cells so the body is no longer under attack. A comparable approach could also be effective in minimizing the risks of organ transplant rejection.

Innovative Experiments

Prof Shimon Sakaguchi, from a Japanese institution, performed tests on rodents that had their thymus removed, causing autoimmune disease.

He demonstrated that introducing immune cells from other animals could prevent the illness—implying there was a system for blocking defenders from attacking the host.

Dr. Brunkow, from the Institute for Systems Biology in Seattle, and Fred Ramsdell, now at Sonoma Biotherapeutics in San Francisco, were studying an inherited autoimmune disease in mice and humans that resulted in the identification of a gene critical for how T-regs operate.

"Their groundbreaking work has revealed how the immune system is kept in check by regulatory T cells, stopping it from accidentally attacking the body's own tissues," said a leading biological science specialist.

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