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This year's prestigious award in Physiology or Medicine has been granted for revolutionary discoveries that illuminate how the body's defense network targets dangerous pathogens while protecting the body's own cells.

Three esteemed scientists—from Japan Shimon Sakaguchi and American experts Mary Brunkow and Dr. Ramsdell—share this honor.

Their research identified specialized "sentinels" within the defense system that remove malfunctioning immune cells capable of harming the organism.

These findings are now enabling new treatments for immune disorders and malignancies.

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

Crucial Discoveries

"Their research has been decisive for understanding how the body's defenses operates and the reason we do not all develop serious autoimmune diseases," stated the chair of the award panel.

This team's studies explain a core question: In what way does the immune system protect us from numerous invaders while leaving our healthy cells unharmed?

Our immune system uses white blood cells that search for signs of disease, even viruses and bacteria it has never encountered.

These defenders utilize detectors—known as recognition units—that are generated randomly in countless combinations.

This gives the immune system the ability to combat a wide array of invaders, but the unpredictability of the mechanism unavoidably produces immune cells that can target the body.

Security Guards of the Immune System

Researchers previously knew that some of these harmful defense cells were destroyed in the immune organ—where white blood cells develop.

The latest award honors the discovery of regulatory T-cells—known as the body's "security guards"—which travel through the body to neutralize other immune cells that attack the body's own tissues.

We know that this mechanism fails in self-attack conditions such as juvenile diabetes, MS, and rheumatoid arthritis.

The Nobel panel stated, "The discoveries have established a novel area of investigation and accelerated the development of new treatments, for instance for tumors and immune disorders."

In malignancies, T-regs block the system from attacking the growth, so research are focused on reducing their numbers.

In self-attack disorders, experiments are exploring boosting regulatory T-cells so the body is not under attack. A comparable method could also be useful in reducing the chances of transplanted organ failure.

Pioneering Experiments

Professor Shimon Sakaguchi, of a Japanese institution, conducted tests on mice that had their immune gland removed, leading to self-attack conditions.

He demonstrated that introducing defense cells from other mice could prevent the illness—suggesting there was a system for blocking immune cells from attacking the host.

Dr. Brunkow, affiliated with the Institute for Systems Biology in a US city, and Dr. Ramsdell, currently at a biotech firm in a California city, were studying an genetic autoimmune disease in mice and people that led to the identification of a gene vital for the way regulatory T-cells operate.

"The groundbreaking research has uncovered how the body's defenses is controlled by regulatory T cells, stopping it from accidentally targeting the healthy cells," commented a prominent biological science expert.

"This work is a striking example of how basic biological study can have far-reaching consequences for human health."