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This year's Nobel Prize in medical science was awarded for transformative findings that clarify how the immune system targets harmful infections while protecting the healthy tissues.

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

The work identified specialized "sentinels" within the immune system that eliminate rogue defense cells capable of harming the body.

The findings are now enabling innovative treatments for immune disorders and cancer.

The laureates will share a prize fund valued at 11m SEK.

Crucial Findings

"The research has been essential for comprehending how the body's defenses operates and the reason we do not all develop severe self-attack conditions," commented the chair of the award panel.

This team's research explain a fundamental mystery: How does the defense system protect us from countless infections while leaving our own tissues unharmed?

The body's protection system uses immune cells that scan for indicators of disease, including pathogens and bacteria it has never encountered.

Such defenders employ sensors—called receptors—that are generated randomly in countless combinations.

This provides the immune system the ability to combat a broad range of threats, but the unpredictability of the mechanism unavoidably produces immune cells that can attack the host.

Security Guards of the Body

Researchers earlier knew that some of these harmful white blood cells were destroyed in the immune organ—where white blood cells mature.

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

It is known that this mechanism fails in autoimmune diseases such as type-1 diabetes, MS, and RA.

A Nobel panel stated, "The findings have established a novel area of research and accelerated the development of innovative therapies, for example for tumors and autoimmune diseases."

Regarding cancer, T-regs prevent the body from fighting the growth, so research are aimed at reducing their quantity.

In self-attack disorders, trials are testing boosting T-reg cells so the body is no longer under attack. A similar method could also be useful in reducing the chances of organ transplant rejection.

Pioneering Studies

Professor Sakaguchi, of a Japanese institution, performed experiments on rodents that had their immune gland extracted, leading to self-attack conditions.

The researcher showed that injecting defense cells from other animals could stop the disease—implying there was a mechanism for preventing defenders from harming the body.

Mary Brunkow, from the Institute for Systems Biology in Seattle, and Fred Ramsdell, now at a biotech firm in San Francisco, were investigating an genetic immune disorder in mice and humans that resulted in the discovery of a gene vital for the way T-regs operate.

"Their groundbreaking work has revealed how the body's defenses is controlled by T-reg cells, preventing it from accidentally attacking the body's own tissues," said a leading physiology expert.

"This work is a striking example of how basic physiological research can have far-reaching implications for public health."