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This year's Nobel Prize in medical science was granted for revolutionary findings that clarify how the body's defense network attacks harmful infections while sparing the body's own cells.

A trio of renowned scientists—from Japan Prof. Sakaguchi and US experts Mary Brunkow and Fred Ramsdell—share this honor.

Their research uncovered specialized "security guards" within the immune system that remove malfunctioning defense cells capable of attacking the body.

These findings are now enabling innovative therapies for immune disorders and cancer.

These winners will share a prize fund valued at 11 million Swedish kronor.

Decisive Discoveries

"The work has been essential for comprehending how the immune system operates and the reason we do not all develop serious self-attack conditions," stated the chair of the Nobel Committee.

This trio's research explain a fundamental question: How does the defense system defend us from countless infections while keeping our own tissues intact?

Our body's protection system uses immune cells that scan for indicators of infection, even viruses and germs it has never encountered.

These defenders utilize sensors—known as receptors—that are produced randomly in a vast number of combinations.

This gives the defense network the capacity to fight a broad range of invaders, but the randomness of the process inevitably produces immune cells that can attack the body.

Protectors of the Immune System

Scientists previously understood that some of these problematic white blood cells were destroyed in the immune organ—the site where immune cells develop.

The latest Nobel Prize honors the discovery of T-reg cells—described as the body's "security guards"—which travel through the body to neutralize other immune cells that attack the healthy cells.

We know that this process malfunctions in autoimmune diseases such as type-1 diabetes, MS, and rheumatoid arthritis.

The prize committee added, "The discoveries have established a new field of investigation and accelerated the creation of new therapies, for example for tumors and immune disorders."

In cancer, regulatory T-cells block the body from attacking the growth, so studies are aimed at lowering their numbers.

For self-attack disorders, trials are exploring boosting regulatory T-cells so the body is no longer under attack. A comparable method could also be effective in reducing the chances of transplanted organ failure.

Pioneering Studies

Prof Sakaguchi, from a Japanese institution, conducted tests on mice that had their thymus removed, leading to self-attack conditions.

He demonstrated that introducing defense cells from healthy mice could prevent the disease—suggesting there was a system for preventing defenders from attacking the host.

Mary Brunkow, affiliated with the Institute for Systems Biology in a US city, and Fred Ramsdell, now at Sonoma Biotherapeutics in San Francisco, were studying an inherited autoimmune disease in mice and people that resulted in the identification of a genetic factor vital for how regulatory T-cells operate.

"Their pioneering work has revealed how the body's defenses is controlled by T-reg cells, stopping it from mistakenly attacking the healthy cells," said a leading biological science specialist.

"The work is a remarkable illustration of how fundamental physiological research can have far-reaching consequences for public health."