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The prestigious award in Physiology or Medicine was awarded for revolutionary findings that clarify how the immune system targets dangerous pathogens while sparing the healthy tissues.

A trio of esteemed scientists—from Japan Shimon Sakaguchi and American experts Dr. Brunkow and Dr. Ramsdell—share this accolade.

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

These findings are now paving the way for new therapies for autoimmune diseases and malignancies.

These laureates will divide a monetary award worth 11 million SEK.

Decisive Discoveries

"The research has been decisive for understanding how the immune system operates and the reason we don't all develop severe autoimmune diseases," commented the chair of the award panel.

This team's research explain a fundamental question: How does the defense system defend us from numerous invaders while keeping our own tissues intact?

The immune system uses immune cells that scan for signs of disease, even viruses and bacteria it has never encountered.

These cells employ detectors—known as receptors—that are generated randomly in countless variations.

This gives the defense network the capacity to fight a broad range of threats, but the unpredictability of the mechanism inevitably creates immune cells that may target the host.

Protectors of the Body

Researchers previously knew that a portion of these problematic white blood cells were eliminated in the thymus—the site where white blood cells develop.

The latest Nobel Prize honors the identification of regulatory T-cells—known as the immune system's "peacekeepers"—which travel through the body to neutralize other defenders that attack the healthy cells.

It is known that this process malfunctions in self-attack conditions such as type-1 diabetes, MS, and RA.

A Nobel panel stated, "The findings have laid the foundation for a new field of research and accelerated the creation of innovative therapies, for example for cancer and immune disorders."

Regarding malignancies, regulatory T-cells prevent the body from attacking the tumor, so studies are aimed at reducing their quantity.

For self-attack disorders, experiments are testing increasing T-reg cells so the organism is not under attack. A similar method could also be effective in reducing the chances of transplanted organ rejection.

Pioneering Experiments

Prof Shimon Sakaguchi, from Osaka University, conducted tests on mice that had their thymus removed, causing autoimmune disease.

The researcher demonstrated that injecting immune cells from other animals could prevent the illness—suggesting there was a system for blocking defenders from attacking the body.

Mary Brunkow, from the Institute for Systems Biology in a US city, and Dr. Ramsdell, now at a biotech firm in a California city, were investigating an genetic immune disorder in mice and humans that led to the identification of a gene critical for how T-regs operate.

"The pioneering research has uncovered how the immune system is controlled by regulatory T cells, stopping it from mistakenly attacking the body's own tissues," said a leading physiology specialist.

"This research is a striking illustration of how fundamental biological research can have broad implications for human health."