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

A trio of esteemed scientists—Japan's Prof. Sakaguchi and American experts Dr. Brunkow and Fred Ramsdell—share this honor.

Their work identified unique "security guards" within the defense system that eliminate malfunctioning immune cells capable of harming the organism.

These discoveries are now enabling new therapies for autoimmune diseases and malignancies.

The laureates will divide a prize fund worth 11 million SEK.

Crucial Discoveries

"The work has been decisive for comprehending how the immune system operates and the reason we don't all suffer from severe autoimmune diseases," stated the chair of the Nobel Committee.

The trio's research explain a fundamental mystery: How does the immune system protect us from numerous infections while keeping our healthy cells intact?

Our body's protection system employs immune cells that search for indicators of infection, including viruses and bacteria it has not met before.

Such cells utilize detectors—called recognition units—that are produced by chance in countless variations.

This provides the immune system the ability to combat a broad range of invaders, but the randomness of the mechanism unavoidably produces white blood cells that can attack the host.

Protectors of the Immune System

Researchers previously understood that some of these harmful defense cells were destroyed in the thymus—where white blood cells mature.

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

It is known that this process malfunctions in autoimmune diseases such as juvenile diabetes, MS, and RA.

The prize committee stated, "These discoveries have established a new field of research and accelerated the creation of innovative treatments, for instance for cancer and immune disorders."

Regarding cancer, T-regs block the system from fighting the tumor, so research are focused on reducing their quantity.

In self-attack disorders, experiments are exploring increasing regulatory T-cells so the body is no longer being harmed. A comparable approach could also be useful in minimizing the risks of organ transplant rejection.

Pioneering Studies

Prof Shimon Sakaguchi, from Osaka University, conducted experiments on rodents that had their thymus extracted, causing autoimmune disease.

The researcher demonstrated that injecting immune cells from healthy animals could prevent the disease—suggesting there was a system for blocking immune cells from attacking the host.

Dr. Brunkow, from the Institute for Systems Biology in Seattle, and Fred Ramsdell, currently at Sonoma Biotherapeutics in a California city, were investigating an inherited autoimmune disease in mice and people that resulted in the discovery of a gene vital for how T-regs operate.

"The groundbreaking research has uncovered how the body's defenses is controlled by regulatory T cells, preventing it from accidentally attacking the healthy cells," said a prominent physiology specialist.

"The work is a remarkable illustration of how fundamental biological research can have broad consequences for human health."