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The Nobel Prize in medical science has been granted for transformative discoveries that clarify how the immune system targets harmful infections while sparing the healthy tissues.

A trio of renowned researchers—from Japan Shimon Sakaguchi and American scientists Mary Brunkow and Fred Ramsdell—received this accolade.

Their work uncovered unique "security guards" within the defense system that remove rogue immune cells capable of harming the organism.

The findings are now enabling innovative therapies for immune disorders and malignancies.

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

Decisive Findings

"The work has been decisive for understanding how the body's defenses functions and why we don't all develop severe autoimmune diseases," stated the head of the Nobel Committee.

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

The immune system uses immune cells that scan for indicators of disease, including pathogens and bacteria it has not met before.

These cells utilize sensors—known as recognition units—that are produced by chance in countless variations.

This provides the defense network the capacity to fight a wide array of threats, but the unpredictability of the mechanism inevitably creates immune cells that can attack the body.

Security Guards of the Immune System

Researchers earlier knew that some of these problematic defense cells were eliminated in the immune organ—where white blood cells mature.

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

It is known that this process malfunctions in autoimmune diseases such as juvenile diabetes, multiple sclerosis, and rheumatoid arthritis.

The prize committee stated, "These findings have laid the foundation for a new field of investigation and accelerated the development of new therapies, for instance for cancer and immune disorders."

In malignancies, regulatory T-cells block the system from attacking the tumor, so studies are aimed at reducing their quantity.

For self-attack disorders, trials are exploring increasing T-reg cells so the organism is not being harmed. A comparable method could also be effective in minimizing the risks of transplanted organ failure.

Pioneering Studies

Prof Shimon Sakaguchi, of a Japanese institution, conducted experiments on mice that had their thymus removed, causing autoimmune disease.

The researcher demonstrated that introducing defense cells from other animals could stop the disease—suggesting there was a mechanism for preventing immune cells from attacking the host.

Dr. Brunkow, from the Institute for Systems Biology in Seattle, and Dr. Ramsdell, currently at Sonoma Biotherapeutics in San Francisco, were investigating an inherited autoimmune disease in mice and humans that resulted in the identification of a gene vital for how regulatory T-cells operate.

"Their groundbreaking research has uncovered how the body's defenses is kept in check by regulatory T cells, preventing it from accidentally targeting the body's own tissues," commented a leading biological science specialist.

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