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The prestigious award in medical science was awarded for transformative discoveries that illuminate how the immune system attacks dangerous infections while sparing the healthy tissues.

A trio of esteemed scientists—Japan's Shimon Sakaguchi and US scientists Mary Brunkow and Dr. Ramsdell—share this accolade.

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

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

The winners will divide a monetary award worth 11 million Swedish kronor.

Crucial Findings

"Their work has been essential for comprehending how the body's defenses operates and why we don't all develop serious autoimmune diseases," commented the head of the award panel.

The team's studies explain a fundamental question: How does the immune system defend us from countless infections while keeping our own tissues intact?

Our immune system employs white blood cells that search for signs of infection, even viruses and bacteria it has not met before.

Such cells utilize sensors—called receptors—that are generated randomly in a vast number of combinations.

This provides the immune system the capacity to combat a broad range of invaders, but the unpredictability of the mechanism inevitably produces white blood cells that can attack the host.

Protectors of the Immune System

Researchers earlier knew that some of these harmful defense cells were destroyed in the thymus—where immune cells develop.

The latest award honors the discovery of T-reg cells—described as the immune system's "peacekeepers"—which patrol the body to neutralize other defenders that assault the healthy cells.

We know that this mechanism fails in autoimmune diseases such as type-1 diabetes, MS, and RA.

A Nobel panel added, "The discoveries have laid the foundation for a new field of research and spurred the creation of new treatments, for instance for cancer and immune disorders."

In malignancies, regulatory T-cells prevent the system from fighting the tumor, so studies are focused on lowering their quantity.

In self-attack disorders, experiments are testing increasing regulatory T-cells so the body is no longer under attack. A similar method could also be useful in minimizing the chances of organ transplant failure.

Innovative Studies

Prof Sakaguchi, of a Japanese institution, performed experiments on rodents that had their thymus extracted, leading to autoimmune disease.

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

Dr. Brunkow, from the a research center in Seattle, and Fred Ramsdell, now at Sonoma Biotherapeutics in a California city, were investigating an genetic autoimmune disease in rodents and people that led to the discovery of a genetic factor critical for how regulatory T-cells function.

"The pioneering research has revealed how the body's defenses is kept in check by T-reg cells, preventing it from accidentally attacking the body's own tissues," commented a leading biological science expert.

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