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This year's Nobel Prize in medical science has been awarded for revolutionary findings that clarify how the immune system targets dangerous pathogens while sparing the healthy tissues.

A trio of renowned scientists—from Japan Prof. Sakaguchi and US experts Dr. Brunkow and Fred Ramsdell—share this accolade.

Their research uncovered specialized "sentinels" within the defense system that remove rogue immune cells capable of harming the body.

These findings are now paving the way for new treatments for autoimmune diseases and cancer.

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

Decisive Discoveries

"The research has been essential for comprehending how the body's defenses operates and the reason we do not all develop severe autoimmune diseases," stated the chair of the award panel.

The trio's research address a fundamental question: How does the defense system defend us from numerous invaders while leaving our own tissues unharmed?

The immune system employs white blood cells that scan for indicators of disease, even viruses and germs it has never encountered.

Such defenders employ sensors—called receptors—that are generated randomly in countless variations.

That gives the defense network the capacity to combat a wide array of threats, but the unpredictability of the process inevitably creates immune cells that can target the body.

Protectors of the Body

Researchers earlier knew that a portion of these problematic white blood cells were destroyed in the thymus—where white blood cells mature.

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

It is known that this process malfunctions in autoimmune diseases such as type-1 diabetes, multiple sclerosis, and rheumatoid arthritis.

The Nobel panel stated, "The findings have established a novel area of investigation and spurred the creation of new treatments, for instance for tumors and autoimmune diseases."

In cancer, regulatory T-cells prevent the system from attacking the tumor, so research are aimed at lowering their quantity.

For autoimmune diseases, experiments are exploring boosting T-reg cells so the organism is not under attack. A similar method could also be useful in minimizing the chances of transplanted organ failure.

Pioneering Experiments

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

The researcher demonstrated that injecting defense cells from healthy animals could prevent the illness—suggesting there was a mechanism for blocking immune cells from attacking the body.

Mary Brunkow, affiliated with the a research center in Seattle, and Fred Ramsdell, currently at Sonoma Biotherapeutics in a California city, were investigating an genetic immune disorder in rodents and people that resulted in the discovery of a genetic factor vital for the way T-regs function.

"Their groundbreaking work has revealed how the body's defenses is kept in check by regulatory T cells, preventing it from mistakenly attacking the body's own tissues," said a prominent physiology expert.

"The work is a remarkable illustration of how basic physiological study can have broad consequences for human health."