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The Nobel Prize in Physiology or Medicine was granted for transformative findings that illuminate how the body's defense network attacks harmful pathogens while sparing the healthy tissues.

Three renowned scientists—from Japan Shimon Sakaguchi and US scientists Mary Brunkow and Dr. Ramsdell—share this honor.

The research uncovered specialized "sentinels" within the immune system that remove rogue immune cells that could attacking the body.

The discoveries are now enabling innovative treatments for autoimmune diseases and cancer.

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

Decisive Findings

"The work has been decisive for comprehending how the body's defenses functions and the reason we don't all develop severe autoimmune diseases," stated the head of the award panel.

The team's research explain a fundamental question: In what way does the defense system defend us from numerous infections while keeping our own tissues intact?

The body's protection system uses white blood cells that scan for signs of infection, including viruses and bacteria it has never encountered.

These cells employ sensors—known as recognition units—that are produced by chance in a vast number of combinations.

This provides the defense network the capacity to combat a wide array of threats, but the randomness of the mechanism inevitably produces immune cells that can attack the host.

Security Guards of the Immune System

Researchers earlier understood that some of these problematic white blood cells were eliminated in the immune organ—where immune cells develop.

This year's award recognizes the identification of regulatory T-cells—known as the body's "security guards"—which travel through the system to disarm any immune cells that attack the healthy cells.

It is known that this process fails in self-attack conditions such as juvenile diabetes, MS, and RA.

A Nobel panel added, "The findings have established a new field of research and spurred the development of innovative treatments, for instance for cancer and autoimmune diseases."

In cancer, T-regs block the body from attacking the growth, so research are aimed at lowering their numbers.

In self-attack disorders, trials are testing increasing T-reg cells so the organism is no longer under attack. A comparable approach could also be useful in minimizing the chances of organ transplant rejection.

Pioneering Studies

Prof Sakaguchi, from a Japanese institution, conducted experiments on mice that had their immune gland removed, causing self-attack conditions.

He demonstrated that introducing defense cells from other animals could stop the illness—implying there was a system for preventing defenders from harming the host.

Dr. Brunkow, from the a research center in a US city, and Dr. Ramsdell, now at a biotech firm in a California city, were studying an genetic autoimmune disease in mice and people that resulted in the discovery of a genetic factor vital for the way regulatory T-cells function.

"The groundbreaking research has uncovered how the immune system is controlled by regulatory T cells, stopping it from mistakenly targeting the healthy cells," commented a prominent biological science specialist.

"This work is a striking example of how fundamental physiological research can have far-reaching implications for human health."