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The Nobel Prize in medical science was granted for transformative findings that clarify how the body's defense network targets dangerous infections while protecting the healthy tissues.

A trio of renowned researchers—from Japan Prof. Sakaguchi and American experts Mary Brunkow and Dr. Ramsdell—share this honor.

The work identified unique "security guards" within the defense system that eliminate malfunctioning immune cells that could attacking the body.

The discoveries are now paving the way for innovative treatments for immune disorders and malignancies.

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

Decisive Findings

"The research has been decisive for comprehending how the body's defenses operates and the reason we do not all suffer from severe self-attack conditions," commented the head of the Nobel Committee.

This team's research address a core mystery: How does the defense system protect us from countless invaders while keeping our own tissues unharmed?

Our immune system uses white blood cells that scan for indicators of infection, even pathogens and bacteria it has not met before.

These defenders utilize detectors—known as receptors—that are produced by chance in countless combinations.

That gives the defense network the capacity to fight a broad range of threats, but the unpredictability of the process inevitably produces white blood cells that may target the body.

Security Guards of the Immune System

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

This year's Nobel Prize honors the identification of T-reg cells—described as the body's "peacekeepers"—which patrol the body to neutralize other immune cells that attack the healthy cells.

We know that this process fails in autoimmune diseases such as juvenile diabetes, multiple sclerosis, and rheumatoid arthritis.

A prize committee added, "The discoveries have established a novel area of investigation and spurred the creation of innovative treatments, for example for cancer and autoimmune diseases."

Regarding cancer, regulatory T-cells prevent the body from attacking the growth, so studies are aimed at reducing their numbers.

For autoimmune diseases, experiments are testing boosting T-reg cells so the organism is not under attack. A comparable approach could also be useful in minimizing the risks of transplanted organ rejection.

Pioneering Experiments

Prof Sakaguchi, from a Japanese institution, conducted tests on mice that had their immune gland extracted, leading to self-attack conditions.

The researcher demonstrated that introducing immune cells from other animals could stop the illness—implying there was a mechanism for blocking defenders from harming the host.

Dr. Brunkow, affiliated with the Institute for Systems Biology in Seattle, and Fred Ramsdell, currently at a biotech firm in San Francisco, were studying an genetic immune disorder in rodents and people that led to the discovery of a genetic factor critical for the way T-regs function.

"The pioneering work has revealed how the immune system is kept in check by T-reg cells, stopping it from mistakenly attacking the healthy cells," said a prominent biological science expert.

"The research is a remarkable illustration of how basic biological study can have far-reaching consequences for human health."