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The Nobel Prize in medical science has been awarded for transformative discoveries that clarify how the immune system attacks harmful infections while protecting the healthy tissues.

A trio of renowned scientists—from Japan Prof. Sakaguchi and American scientists Dr. Brunkow and Fred Ramsdell—share this honor.

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

The findings are now paving the way for innovative treatments for autoimmune diseases and malignancies.

The winners will divide a monetary award worth 11 million SEK.

Crucial Discoveries

"Their work has been essential for understanding how the immune system functions and the reason we do not all develop serious autoimmune diseases," commented the chair of the Nobel Committee.

The team's research explain a fundamental question: How does the immune system protect us from numerous infections while leaving our own tissues intact?

Our body's protection system uses white blood cells that search for indicators of disease, including pathogens and germs it has never encountered.

These defenders employ detectors—called recognition units—that are produced by chance in countless variations.

That gives the defense network the capacity to combat a broad range of invaders, but the unpredictability of the process unavoidably produces immune cells that may target the body.

Security Guards of the Body

Researchers earlier understood that some of these problematic defense cells were destroyed in the thymus—where white blood cells develop.

The latest Nobel Prize recognizes the discovery of regulatory T-cells—known as the immune system's "security guards"—which patrol the body to neutralize any defenders that attack the body's own tissues.

It is known that this mechanism fails in self-attack conditions 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 new therapies, for instance for cancer and immune disorders."

In cancer, regulatory T-cells prevent the system from attacking the tumor, so research are focused on reducing their quantity.

In autoimmune diseases, experiments are testing increasing regulatory T-cells so the body is no longer under attack. A comparable method could also be useful in reducing the risks of transplanted organ rejection.

Innovative Studies

Prof Sakaguchi, from a Japanese institution, conducted tests on mice that had their immune gland extracted, leading to autoimmune disease.

The researcher demonstrated that injecting defense cells from other animals could prevent the disease—implying there was a mechanism for blocking immune cells from attacking the host.

Mary Brunkow, from the Institute for Systems Biology in a US city, and Dr. Ramsdell, currently at Sonoma Biotherapeutics in a California city, were studying an inherited autoimmune disease in rodents and humans that resulted in the discovery of a genetic factor vital for how T-regs operate.

"The pioneering work has uncovered how the immune system is controlled by T-reg cells, stopping it from accidentally targeting the body's own tissues," said a leading physiology specialist.

"The research is a remarkable illustration of how basic biological research can have broad consequences for human health."