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The prestigious award in Physiology or Medicine was granted for revolutionary findings that clarify how the immune system targets harmful pathogens while sparing the healthy tissues.

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

Their research uncovered unique "security guards" within the defense system that remove rogue immune cells that could harming the body.

The findings are now paving the way for innovative treatments for immune disorders and malignancies.

These winners will divide a prize fund valued at 11m SEK.

Decisive Findings

"The work has been essential for comprehending how the body's defenses operates and the reason we don't all develop serious self-attack conditions," stated the head of the Nobel Committee.

This team's studies explain a fundamental mystery: How does the immune system protect us from countless invaders while keeping our healthy cells intact?

Our body's protection system uses immune cells that scan for signs of infection, including viruses and bacteria it has not met before.

Such defenders employ sensors—called recognition units—that are produced randomly in a vast number of variations.

This provides the defense network the capacity to fight a wide array of invaders, but the randomness of the mechanism inevitably produces immune cells that may attack the body.

Security Guards of the Immune System

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

This year's Nobel Prize honors the discovery of T-reg cells—known as the immune system's "peacekeepers"—which travel through the system to neutralize any immune cells that attack the healthy cells.

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

The prize committee added, "These findings have laid the foundation for a novel area of research and spurred the development of new therapies, for example for cancer and immune disorders."

In malignancies, regulatory T-cells prevent the system from attacking the growth, so research are focused on lowering their quantity.

In autoimmune diseases, experiments are exploring boosting regulatory T-cells so the body is not being harmed. A similar approach could also be effective in reducing the chances of transplanted organ rejection.

Pioneering Studies

Prof Sakaguchi, of a Japanese institution, conducted tests on rodents that had their thymus removed, causing self-attack conditions.

He demonstrated that injecting immune cells from healthy animals could stop the illness—implying there was a mechanism for preventing defenders from attacking the host.

Dr. Brunkow, from the a research center in Seattle, and Dr. Ramsdell, currently at Sonoma Biotherapeutics in San Francisco, were investigating an genetic immune disorder in rodents and humans that resulted in the discovery of a gene critical for the way T-regs operate.

"Their groundbreaking work has revealed how the body's defenses is kept in check by T-reg cells, preventing it from accidentally attacking the body's own tissues," commented a leading biological science specialist.

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