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This year's Nobel Prize in medical science was awarded for revolutionary findings that illuminate how the body's defense network targets dangerous pathogens while sparing the healthy tissues.

A trio of esteemed scientists—Japan's Prof. Sakaguchi and US experts Dr. Brunkow and Dr. Ramsdell—received this honor.

The research uncovered unique "security guards" within the immune system that remove malfunctioning immune cells that could attacking the body.

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

These winners will divide a prize fund worth 11 million Swedish kronor.

Decisive Findings

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

The trio's studies address a fundamental mystery: In what way does the defense system defend us from numerous infections while leaving our own tissues unharmed?

The immune system uses white blood cells that scan for indicators of infection, even pathogens and bacteria it has never encountered.

Such defenders utilize detectors—called receptors—that are produced randomly in a vast number of variations.

This provides the immune system the ability to combat a wide array of invaders, but the randomness of the process inevitably creates immune cells that may target the host.

Protectors of the Immune System

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

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

It is known that this mechanism fails in autoimmune diseases such as juvenile diabetes, multiple sclerosis, and RA.

The prize committee stated, "These discoveries have established a novel area of investigation and spurred the creation of new treatments, for example for cancer and immune disorders."

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

For self-attack disorders, experiments are testing boosting T-reg cells so the organism is no longer being harmed. A comparable approach could also be effective in minimizing the risks of transplanted organ failure.

Pioneering Experiments

Professor Sakaguchi, from Osaka University, performed experiments on mice that had their immune gland removed, causing autoimmune disease.

The researcher demonstrated that introducing immune cells from healthy animals could stop the illness—implying there was a mechanism for preventing defenders from attacking the host.

Dr. Brunkow, from the a research center in a US city, and Dr. Ramsdell, currently at Sonoma Biotherapeutics in San Francisco, were studying an inherited immune disorder in mice and humans that resulted in the identification of a gene critical for how regulatory T-cells function.

"The pioneering research has revealed how the body's defenses is kept in check by regulatory T cells, preventing it from mistakenly targeting the body's own tissues," said a prominent physiology expert.

"This research is a striking example of how fundamental physiological research can have broad consequences for human health."