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This year's prestigious award in Physiology or Medicine was granted for transformative discoveries that clarify how the body's defense network targets harmful infections while protecting the healthy tissues.

Three renowned researchers—from Japan Shimon Sakaguchi and US experts Mary Brunkow and Dr. Ramsdell—share this accolade.

Their work identified unique "sentinels" within the immune system that remove malfunctioning defense cells capable of attacking the body.

The discoveries are now enabling innovative treatments for autoimmune diseases and malignancies.

The laureates will share a prize fund valued at 11 million Swedish kronor.

Decisive Findings

"Their work has been essential for comprehending how the immune system functions and why we don't all suffer from serious self-attack conditions," stated the chair of the Nobel Committee.

The team's studies explain a fundamental mystery: In what way does the defense system protect us from countless invaders while keeping our healthy cells unharmed?

The immune system uses white blood cells that search for indicators of disease, including viruses and germs it has never encountered.

These cells utilize detectors—called receptors—that are produced by chance in countless combinations.

This provides the defense network the ability to combat a broad range of threats, but the randomness of the mechanism unavoidably creates white blood cells that may target the body.

Security Guards of the Immune System

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

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

It is known that this process malfunctions in self-attack conditions such as type-1 diabetes, MS, and RA.

The Nobel panel added, "These findings have laid the foundation for a new field of investigation and spurred the development of new treatments, for instance for tumors and autoimmune diseases."

Regarding cancer, regulatory T-cells block the body from fighting the tumor, so studies are aimed at lowering their numbers.

For autoimmune diseases, experiments are exploring increasing regulatory T-cells so the body is not being harmed. A comparable approach could also be useful in minimizing the chances of transplanted organ rejection.

Innovative Studies

Professor Shimon Sakaguchi, of Osaka University, conducted experiments on rodents that had their thymus extracted, leading to self-attack conditions.

He showed that introducing defense cells from healthy mice could stop the illness—suggesting there was a mechanism for preventing defenders from harming the body.

Dr. Brunkow, from the Institute for Systems Biology in Seattle, and Dr. Ramsdell, currently at a biotech firm in a California city, were investigating an genetic immune disorder in mice and humans that led to the identification of a gene vital for the way regulatory T-cells function.

"The pioneering research has uncovered how the body's defenses is kept in check by regulatory T cells, stopping it from mistakenly attacking the body's own tissues," said a leading physiology expert.

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