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This year's prestigious award in Physiology or Medicine has been awarded for transformative findings that illuminate how the immune system attacks harmful pathogens while sparing the body's own cells.

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

The work uncovered unique "security guards" within the defense system that eliminate malfunctioning immune cells that could harming the body.

The discoveries are now paving the way for new treatments for autoimmune diseases and cancer.

The winners will share a monetary award valued at 11m Swedish kronor.

Decisive Findings

"Their work has been decisive for understanding how the immune system operates and why we don't all develop severe self-attack conditions," commented the chair of the award panel.

The team's research address a core question: How does the immune system defend us from countless invaders while leaving our healthy cells unharmed?

Our body's protection system employs white blood cells that search for indicators of infection, even pathogens and germs it has not met before.

These defenders utilize detectors—called receptors—that are produced by chance in countless variations.

This provides the defense network the ability to fight a broad range of invaders, but the randomness of the process inevitably creates white blood cells that can attack the body.

Security Guards of the Immune System

Researchers earlier knew that some of these problematic defense cells were eliminated in the thymus—the site where white blood cells mature.

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

It is known that this mechanism malfunctions in autoimmune diseases such as juvenile diabetes, MS, and RA.

A Nobel panel stated, "These findings have established a new field of investigation and spurred the creation of innovative treatments, for example for cancer and autoimmune diseases."

Regarding malignancies, T-regs block the body from attacking the growth, so research are focused on lowering their numbers.

For autoimmune diseases, experiments are exploring boosting regulatory T-cells so the organism is not being harmed. A similar approach could also be useful in reducing the chances of organ transplant failure.

Pioneering Studies

Prof Shimon Sakaguchi, from Osaka University, performed experiments on rodents that had their immune gland extracted, leading to self-attack conditions.

He showed that introducing immune cells from other mice could prevent the disease—suggesting there was a mechanism for blocking defenders from harming the host.

Mary Brunkow, affiliated with the a research center in a US city, and Dr. Ramsdell, now at Sonoma Biotherapeutics in a California city, were investigating an inherited immune disorder in mice and humans that resulted in the identification of a gene critical for how T-regs operate.

"Their 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 leading biological science specialist.

"The work is a striking example of how basic physiological research can have far-reaching implications for human health."