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The Nobel Prize in Physiology or Medicine has been granted for revolutionary findings that clarify how the body's defense network targets harmful pathogens while sparing the healthy tissues.

Three esteemed researchers—from Japan Shimon Sakaguchi and American experts Dr. Brunkow and Fred Ramsdell—received this accolade.

Their work uncovered unique "sentinels" within the defense system that remove malfunctioning defense cells that could attacking the body.

These findings are now enabling innovative therapies for autoimmune diseases and cancer.

The winners will share a monetary award worth 11m Swedish kronor.

Crucial Findings

"Their work has been essential for comprehending how the immune system operates and the reason we don't all suffer from severe autoimmune diseases," commented the chair of the award panel.

The team's studies address a core mystery: How does the defense system protect us from numerous invaders while keeping our own tissues intact?

The body's protection system employs immune cells that scan for indicators of disease, even pathogens and germs it has not met before.

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

That provides the immune system the ability to combat a wide array of invaders, but the unpredictability of the mechanism inevitably produces white blood cells that may attack the body.

Protectors of the Immune System

Scientists previously knew that some of these harmful white blood cells were destroyed in the thymus—the site where immune cells mature.

The latest award honors the discovery of T-reg cells—described as the body's "security guards"—which patrol the body to neutralize any defenders that assault the healthy cells.

We know that this process malfunctions in self-attack conditions such as type-1 diabetes, multiple sclerosis, and RA.

The Nobel panel added, "The discoveries have laid the foundation for a new field of investigation and spurred the creation of new therapies, for example for cancer and autoimmune diseases."

Regarding cancer, regulatory T-cells block the body from fighting the growth, so studies are focused on reducing their numbers.

For self-attack disorders, experiments are testing boosting T-reg cells so the body is not being harmed. A comparable method could also be effective in reducing the risks of transplanted organ rejection.

Innovative Experiments

Professor Sakaguchi, of a Japanese institution, performed tests on rodents that had their thymus extracted, causing self-attack conditions.

The researcher demonstrated that introducing defense cells from other animals could prevent the disease—implying there was a system for blocking immune cells from harming the body.

Dr. Brunkow, affiliated with the a research center in Seattle, and Fred Ramsdell, now at a biotech firm in a California city, were investigating an inherited autoimmune disease in mice and humans that led to the identification of a genetic factor vital for the way regulatory T-cells function.

"The groundbreaking work has revealed how the body's defenses is kept in check by T-reg cells, preventing it from accidentally attacking the body's own tissues," said a leading biological science specialist.

"This work is a striking example of how basic physiological study can have broad implications for human health."