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This year's Nobel Prize in medical science was granted for revolutionary findings that clarify how the immune system attacks dangerous infections while protecting the body's own cells.

A trio of renowned scientists—from Japan Prof. Sakaguchi and US scientists Mary Brunkow and Dr. Ramsdell—share this accolade.

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

These findings are now paving the way for new therapies for immune disorders and malignancies.

These winners will divide a prize fund worth 11 million SEK.

Crucial Findings

"Their research has been decisive for comprehending how the body's defenses operates and why we don't all suffer from severe self-attack conditions," stated the head of the Nobel Committee.

The trio's studies explain a core mystery: How does the immune system protect us from countless invaders while leaving our own tissues unharmed?

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

These defenders utilize sensors—known as recognition units—that are produced randomly in countless combinations.

That gives the immune system the ability to combat a wide array of threats, but the randomness of the mechanism inevitably creates white blood cells that can target the body.

Security Guards of the Body

Researchers previously understood that a portion of these harmful white blood cells were destroyed in the immune organ—where immune cells mature.

The latest Nobel Prize honors the discovery of T-reg cells—described as the body's "peacekeepers"—which patrol the body to disarm other defenders that attack the body's own tissues.

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

The prize committee stated, "These discoveries have laid the foundation for a new field of investigation and spurred the creation of new treatments, for example for tumors and autoimmune diseases."

In malignancies, T-regs prevent the body from fighting the growth, so research are focused on lowering their quantity.

For autoimmune diseases, experiments are exploring boosting regulatory T-cells so the organism is no longer under attack. A comparable method could also be useful in minimizing the risks of transplanted organ rejection.

Pioneering Studies

Prof Shimon Sakaguchi, from a Japanese institution, conducted tests on rodents that had their immune gland extracted, causing autoimmune disease.

The researcher demonstrated that introducing defense cells from other mice could prevent the disease—implying there was a mechanism for preventing immune cells from harming the host.

Dr. Brunkow, from the a research center in Seattle, and Dr. Ramsdell, currently at a biotech firm in a California city, were studying an inherited immune disorder in mice and people that led to the discovery of a genetic factor critical for the way T-regs operate.

"Their groundbreaking research has uncovered how the immune system is controlled by regulatory T cells, preventing it from mistakenly targeting the body's own tissues," said a leading physiology specialist.

"This work is a remarkable example of how fundamental physiological study can have broad consequences for human health."