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The Nobel Prize in Physiology or Medicine has been granted for transformative findings that illuminate how the immune system attacks harmful infections while sparing the healthy tissues.

Three renowned researchers—from Japan Prof. Sakaguchi and American experts Mary Brunkow and Dr. Ramsdell—received this accolade.

The work identified unique "sentinels" within the defense system that eliminate rogue immune cells that could attacking the organism.

These discoveries are now enabling innovative therapies for immune disorders and cancer.

These winners will divide a prize fund worth 11m SEK.

Crucial Discoveries

"Their work has been essential for comprehending how the body's defenses functions and why we do not all develop serious self-attack conditions," commented the chair of the Nobel Committee.

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

Our immune system uses white blood cells that scan for indicators of disease, including viruses and bacteria it has never encountered.

These cells utilize detectors—called receptors—that are generated by chance in a vast number of variations.

This gives the defense network the ability to fight a broad range of threats, but the unpredictability of the mechanism unavoidably creates immune cells that may attack the host.

Protectors of the Body

Scientists previously understood that a portion of these problematic white blood cells were eliminated in the immune organ—the site where white blood cells develop.

This year's award honors the discovery of regulatory T-cells—known as the immune system's "security guards"—which travel through the body to disarm any defenders that attack the body's own tissues.

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

The Nobel panel stated, "These discoveries have laid the foundation for a new field of investigation and accelerated the development of innovative therapies, for instance for cancer and immune disorders."

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

In autoimmune diseases, trials are testing boosting regulatory T-cells so the organism is not being harmed. A similar approach could also be useful in reducing the risks of transplanted organ failure.

Innovative Studies

Professor Shimon Sakaguchi, from Osaka University, conducted tests on rodents that had their immune gland extracted, causing self-attack conditions.

The researcher showed that injecting immune cells from healthy animals could stop the disease—implying there was a mechanism for blocking defenders from attacking the body.

Mary Brunkow, from the a research center in Seattle, and Dr. Ramsdell, currently at a biotech firm in a California city, were investigating an inherited immune disorder in mice and people that led to the discovery of a gene critical for how regulatory T-cells function.

"The groundbreaking work has revealed how the body's defenses is kept in check by regulatory T cells, stopping it from accidentally attacking the body's own tissues," commented a prominent biological science expert.

"The research is a remarkable example of how fundamental biological research can have broad implications for human health."